CN112812670A - Bi-component PU coating and application thereof - Google Patents
Bi-component PU coating and application thereof Download PDFInfo
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- CN112812670A CN112812670A CN202011625882.2A CN202011625882A CN112812670A CN 112812670 A CN112812670 A CN 112812670A CN 202011625882 A CN202011625882 A CN 202011625882A CN 112812670 A CN112812670 A CN 112812670A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention relates to the technical field of water-based coatings, and particularly relates to a bi-component PU coating and application thereof. A two-component PU coating comprises a main agent A and a hardening agent B; the molar ratio of hydroxyl in the main agent A to isocyanate in the hardener is 1: (1.2-1.5); the preparation raw materials of the main agent A comprise: at least two waterborne acrylic resins, at least one waterborne polyurethane resin, at least one polyester polyol, an auxiliary agent and water; the hardener B at least comprises an isocyanate curing agent and a diluent. The paint film of the cured PU paint has high hardness, excellent flexibility, balanced hardness and flexibility, excellent water resistance, solvent resistance and excellent cosmetic resistance.
Description
Technical Field
The invention relates to the technical field of water-based coatings, and particularly relates to a bi-component PU coating and application thereof.
Background
The surface of the composite material is coated with a layer of protective coating on plastic base materials such as ABS, PC/ABC composite materials, PPS, PVC and the like and metal base materials such as stainless steel, carbon steel, aluminum alloy, magnesium aluminum alloy, tinplate and the like, so that the composite material can resist the external mechanical action while playing a decorative effect, and further achieves the purpose of protecting the base materials, and the coating is required to have high hardness. However, high-hardness paint films tend to be brittle and are prone to spontaneous cracking or the paint films are peeled off due to cracking under the action of external impact, and therefore the paint films lack certain toughness. Therefore, the coating material is required to have high flexibility while having high hardness. At present, household appliances, 3C products such as mobile phones, computers, keyboards, mice, flat panels and the like, products such as automotive upholsteries and the like, and metal base material products such as medical instruments, large-scale equipment and the like have higher requirements on high hardness and high flexibility, so that the external hard instruments can be well resisted, a surface paint film of the paint film has higher hardness, and the paint film can not crack or peel even if the paint film is seriously deformed under the impact of external force.
Patent CN110054979A discloses a water-based paint for plastics, its preparation method and use, which only provides abrasion resistance and flexibility by using alcoholic hydroxyl group-containing aqueous polyester resin dispersion, while hardness can only be maintained at a level not lower than HB.
In order to solve the technical problems, the invention provides a bi-component PU coating which is comparable to a solvent-based coating in performance, is safe and environment-friendly, has low VOC emission, has relatively contradictory properties of relatively good balanced hardness and flexibility, has high hardness and excellent flexibility, has excellent adhesive force on plastic base materials such as ABS, PC and the like and metal base materials such as stainless steel, aluminum alloy and the like, and has excellent water resistance and cosmetic resistance.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides, in a first aspect, a two-component PU coating comprising a main agent a and a hardener B; the molar ratio of hydroxyl in the main agent A to isocyanate in the hardener B is 1: (1.2-1.5);
the preparation raw materials of the main agent A comprise: at least two waterborne acrylic resins, at least one waterborne polyurethane resin, at least one polyester polyol, an auxiliary agent and water;
the hardener B at least comprises an isocyanate curing agent and a diluent.
As a preferable technical scheme of the invention, the water-based acrylic resin is selected from water-based acrylic emulsion, water-based styrene-acrylic emulsion, water-based silicone-acrylic emulsion or water-based fluorocarbon emulsion.
As a preferable technical scheme of the invention, the hydroxyl content of the aqueous acrylic emulsion is 1-5 wt%.
As a preferable technical scheme of the invention, the weight average molecular weight of the aqueous acrylic emulsion is 5000-100000.
As a preferable technical scheme of the invention, the weight average molecular weight of the aqueous styrene-acrylic emulsion is 40000-80000.
As a preferable technical scheme of the invention, the minimum film-forming temperature of the water-based styrene-acrylic emulsion is not higher than 25 ℃.
As a preferable technical scheme of the invention, the weight ratio of the water-based acrylic emulsion to the water-based styrene-acrylic emulsion is (4-11): (3-5).
As a preferable technical scheme of the invention, the weight average molecular weight of the aqueous polyurethane resin is 50000-300000.
As a preferable technical scheme of the invention, the hydroxyl content of the aqueous polyurethane resin is 0-3 wt%.
As a preferred embodiment of the present invention, the polyester polyol is a saturated polyester polyol.
As a preferable technical scheme of the invention, the hydroxyl content of the saturated polyester polyol is 1-10 wt%.
As a preferable technical scheme of the invention, the weight ratio of the waterborne acrylic resin, the waterborne polyurethane resin and the polyester polyol is (10-80): (1-20): (1-20).
As a preferable technical scheme of the invention, the auxiliary agent at least comprises one of a film forming auxiliary agent, a wetting agent, a defoaming agent, a matting agent, a thickening agent, a pH regulator, a catalyst and a coloring agent.
In a preferred embodiment of the present invention, in the hardener B, the weight ratio of the isocyanate curing agent to the diluent is (1-5): 1.
in a preferred embodiment of the present invention, the isocyanate curing agent is HDI-trimer.
The second aspect of the invention provides the application of the bi-component PU coating to the surface decoration of plastics and metals.
Advantageous effects
The invention provides a double-component PU coating, which better solves the contradiction that the hardness and the flexibility of the paint film of the existing water-based coating cannot be obtained simultaneously, the paint film with high hardness is crisp and easy to crack, and the soft paint film has low hardness and is easy to be scratched under the action of external force. The paint film obtained by the technical scheme of the invention has high hardness, excellent flexibility, and relatively contradictory properties of hardness and flexibility in a better balance manner, and the paint film prepared by the technical scheme has excellent water resistance, solvent resistance and cosmetic resistance.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
The "hydroxyl content" and "weight average molecular weight" in the specification and claims are relative to the solids in the emulsion.
In order to solve the above technical problems, the present invention provides, in a first aspect, a two-component PU coating comprising a main agent a and a hardener B; the molar ratio of hydroxyl in the main agent A to isocyanate in the hardener is 1: (1.2-1.5);
the preparation raw materials of the main agent A comprise: at least two waterborne acrylic resins, at least one waterborne polyurethane resin, at least one polyester polyol, an auxiliary agent and water;
the hardener B at least comprises an isocyanate curing agent and a diluent.
Main agent A
In the invention, the preparation raw materials of the main agent A comprise: the water-based acrylic resin comprises at least two water-based acrylic resins, at least one water-based polyurethane resin, at least one polyester polyol, an auxiliary agent and water.
In a preferred embodiment, the weight ratio of the aqueous acrylic resin, the aqueous polyurethane resin and the polyester polyol is (10-80): (1-20): (1-20).
Water-based acrylic resin
In the invention, the water-based acrylic resin is selected from water-based acrylic emulsion, water-based styrene-acrylic emulsion, water-based silicone-acrylic emulsion or water-based fluorocarbon emulsion.
In a preferred embodiment, the aqueous acrylic resin is at least two of aqueous acrylic emulsion, aqueous styrene-acrylic emulsion, aqueous silicone-acrylic emulsion or aqueous fluorocarbon emulsion.
In a preferred embodiment, the aqueous acrylic resin comprises at least an aqueous acrylic emulsion.
In a preferred embodiment, the addition amount of the aqueous acrylic emulsion accounts for 33 wt% to 98 wt% of the total addition amount of the aqueous acrylic resin.
In a preferred embodiment, the aqueous acrylic resin may further include an aqueous styrene-acrylic emulsion
In a preferred embodiment, the adding amount of the water-based styrene-acrylic emulsion accounts for 1 wt% to 66 wt% of the total adding amount of the water-based acrylic resin.
In a preferred embodiment, the aqueous acrylic resin comprises at least an aqueous acrylic emulsion and an aqueous styrene-acrylic emulsion.
In a preferred embodiment, the aqueous acrylic resin is a mixture of an aqueous acrylic emulsion and an aqueous styrene-acrylic emulsion, and the weight ratio of (4-11): (3-5).
The inventor finds that at least two acrylic resins are needed to be matched, one water-based acrylic resin needs to be provided with hydroxyl groups to participate in curing, so that the fullness and hardness of a paint film can be improved, and the other acrylic resin mainly provides adhesion.
The content of the hydroxyl acrylic resin in the system is not excessive and exceeds 98 percent of the total amount of the water-based acrylic resin, a paint film is likely to be brittle and poor in flexibility in crosslinking and curing, and if the hydroxyl acrylic resin is added to be less than 30 percent of the total addition amount of the acrylic resin, the hardness is poor and the chemical performance is influenced; on the other hand, the adhesive resin is preferably styrene-acrylic resin, particularly preferably styrene-acrylic resin without active hydroxyl functional groups, so that the adhesive resin provides a good wetting effect and excellent adhesive force on metal base materials such as aluminum alloy, stainless steel and the like, and has a good promoting effect on wetting and adhesion of a paint film on the base materials.
Aqueous acrylic emulsion
In the invention, the weight part of the water-based acrylic emulsion in the main agent A is 10-60 parts.
In a preferred embodiment, the aqueous acrylic emulsion is present in the main agent a in an amount of 10 parts, 13 parts, 15 parts, 17 parts, 20 parts, 22 parts, 25 parts, 23 parts, 27 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 43 parts, 45 parts, 47 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, etc.
In a more preferred embodiment, the aqueous acrylic emulsion is present in the main agent A in an amount of 20 to 55 parts by weight.
In the invention, the hydroxyl content of the aqueous acrylic emulsion is 1-5 wt%; the hydroxyl group content is the amount of hydroxyl groups relative to the solids in the aqueous acrylic emulsion.
In a more preferred embodiment, the hydroxyl content of the aqueous acrylic emulsion is from 3.3 to 5 wt%;
in a preferred embodiment, the aqueous acrylic emulsion has a solids content of 40 to 50% by weight.
In a preferred embodiment, the weight average molecular weight of the aqueous acrylic emulsion is 5000-100000.
In a more preferred embodiment, the aqueous acrylic emulsion has a weight average molecular weight of 10000-100000.
The inventors have found that the weight average molecular weight of the aqueous acrylic emulsion used in the present systemQuantum (M)w) At 100000 of 5000-wWhen 10000-30000 and the hydroxyl content is 3.3-5.0 wt%, the paint film of the cured paint has different fullness; if the weight average molecular weight of the aqueous acrylic emulsion is too low, the paint results in a paint film with no fullness; if the weight average molecular weight of the aqueous acrylic emulsion is higher, the chain segment of acrylic acid is longer, and the density of the reactive functional group is lower, and particularly, if the weight average molecular weight thereof exceeds 100000, the density of the reactive functional group is lower, resulting in a decrease in the crosslinking density and poor cosmetic resistance.
Water-based styrene-acrylic emulsion
In the invention, the water-based styrene-acrylic emulsion accounts for 1-20 parts by weight of the main agent A.
In a preferred embodiment, the aqueous styrene-acrylic emulsion accounts for 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like in the main agent A.
In a more preferred embodiment, the aqueous styrene-acrylic emulsion accounts for 5 to 15 parts by weight of the main agent A.
In the invention, the weight average molecular weight of the aqueous styrene-acrylic emulsion is 40000-80000.
In a preferred embodiment, the minimum film forming temperature of the aqueous styrene-acrylic emulsion is not higher than 25 ℃.
The inventor believes that the water-based styrene-acrylic emulsion adopted by the system has no active hydroxyl group and has better wettability and adhesive force on metal substrates such as aluminum, stainless steel and the like.
The inventor thinks that the system has better miscibility and good compatibility through the compounding of the water-based acrylic emulsion, the polyester polyol, the water-based polyurethane dispersoid and the water-based styrene-acrylic emulsion, is beneficial to the stability of the coating, can form a uniform paint film and fully exerts the performance of the product. The water-based acrylic emulsion with high hydroxyl content provides excellent fullness and hardness of a paint film, the water-based polyester polyol provides good flexibility and chemical resistance, the water-based polyurethane provides excellent elastic property and has excellent impact cracking resistance, and the water-based styrene-acrylic emulsion provides good wetting effect and excellent adhesive force on metal substrates such as aluminum alloy, stainless steel and the like. Furthermore, different types of aqueous resins with specific molecular weights and hydroxyl contents are selected, so that the aqueous resins have good compatibility and stability, and a paint film has good crosslinking density and excellent flexibility, so that the performances are well balanced.
Aqueous polyurethane resin
In the invention, the weight part of the aqueous polyurethane resin in the main agent A is 1-20 parts.
In a preferred embodiment, the aqueous polyurethane resin is present in the main agent a in an amount of 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.
In a more preferred embodiment, the aqueous polyurethane resin is contained in the main agent a in an amount of 5 to 15 parts by weight.
In the present invention, the weight average molecular weight of the aqueous polyurethane resin is 50000-300000.
In a preferred embodiment, the weight average molecular weight of the aqueous polyurethane resin is 50000-200000.
In a preferred embodiment, the hydroxyl group content of the aqueous polyurethane resin is 0 to 3 wt%; the hydroxyl group content is the amount of hydroxyl groups relative to the solid parts in the aqueous polyurethane dispersant.
In a more preferred embodiment, the hydroxyl group content of the aqueous polyurethane resin is 0 to 1.5 wt%.
The invention considers that if the weight average molecular weight of the aqueous polyurethane dispersion is too high, the compatibility with other resins is poor after exceeding 200000, and particularly after exceeding 300000, the molecular chain segment is difficult to spread and is compatible with other resins, thereby obviously influencing the overall compatibility.
Polyester polyols
In the invention, the polyester polyol accounts for 1-20 parts by weight of the main agent A.
In a preferred embodiment, the polyester polyol is present in the base a in an amount of 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.
In a more preferred embodiment, the polyester polyol is present in an amount of 5 to 15 parts by weight of the base a.
In the invention, the polyester polyol is saturated polyester polyol.
In a preferred embodiment, the saturated polyester polyol has a hydroxyl content of 1 to 10 wt.%.
In a more preferred embodiment, the saturated polyester polyol has a hydroxyl content of 3 to 8 wt.%.
The inventor believes that the polyester polyol adopted by the system can be mixed and dissolved with water in any ratio, and can react with isocyanate to form a better cross-linked network structure, so that a paint film has chemical resistance and flexibility.
The inventor finds that the hydroxyl content in the aqueous acrylic emulsion, the polyester polyol and the aqueous polyurethane dispersion is not higher than 5 wt%; the hydroxyl content is the content of hydroxyl relative to the total solid parts of the aqueous acrylic emulsion, the polyester polyol and the aqueous polyurethane dispersion. If the hydroxyl content in the aqueous acrylic emulsion, the polyester polyol and the aqueous polyurethane dispersion exceeds the upper limit, the crosslinking density is large, so that a paint film of the prepared coating is easy to crack after being cured.
Auxiliary agent
In the invention, the auxiliary agent at least comprises one of a film forming auxiliary agent, a wetting agent, a defoaming agent, a matting powder, a thickening agent, a pH regulator, a catalyst and a coloring agent.
Matting powder
In the invention, the extinction powder accounts for 2-6 parts by weight of the main agent A, and 2 parts, 3 parts, 4 parts, 5 parts, 6 parts and the like can be mentioned.
In the present invention, the matting agent is not particularly limited, and silica and the like can be mentioned.
In a preferred embodiment, mention may be made of silicas prepared by the gas phase process, silicas prepared by the precipitation process, etc.
In the present invention, the source of the silica is not particularly limited, and may be selected from the group consisting of Matt3400, OK520, TS100, and the like, and may be selected from the group consisting of Tosoh, E1011, K500, and the like.
Color paste
In the invention, the color paste accounts for 5-15 parts by weight of the main agent A, and 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts and the like can be mentioned.
In the present invention, the color paste is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, the source of the mill base, without particular limitation, may be mentioned homemade and commercially available.
In a preferred embodiment, the self-making method of the color paste is not particularly limited, and the color paste is prepared by grinding toner, a dispersing agent and water; the fineness is preferably not higher than 20 μm.
Film forming aid
In the invention, the film-forming assistant accounts for 2-8 parts by weight of the main agent A, and 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts and the like can be mentioned.
In the present invention, the film-forming assistant is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, as the film-forming aid, alcohol ether solvents may be mentioned.
In a more preferred embodiment, the alcohol ether solvent is selected from at least one of dipropylene glycol methyl ether (DPM), dipropylene glycol butyl ether (DPNB), propylene glycol butyl ether (PNB), ethylene glycol monobutyl ether, propylene glycol methyl ether (PM), propylene glycol methyl ether acetate (PMA), propylene glycol phenyl ether, propylene glycol, isooctanol, alcohol ester dodeca, dipropylene glycol dimethyl ether (DMM), Propylene Glycol Diacetate (PGDA).
In a most preferred embodiment, the alcohol ether solvent is selected from at least one of dipropylene glycol methyl ether (DPM), dipropylene glycol butyl ether (DPNB), propylene glycol butyl ether (PNB), propylene glycol methyl ether (PM).
Defoaming agent
In the present invention, the defoaming agent accounts for 0.2 to 0.8 part by weight of the main agent a, and 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part and the like can be mentioned.
In the present invention, the defoaming agent is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, as the defoaming agent, polyether (modified) siloxane copolymers, mineral oils, acrylic copolymers, and the like can be mentioned.
In a more preferred embodiment, the defoamer is a polyether (modified) siloxane copolymer.
In the present invention, the source of the defoaming agent is not particularly limited, and commercially available Surfynol AD01, Surfynol AD20, FoamStar ST 2400/2454/2437, FoamStar SI 2250, FoamStar MO 2134 AG, BYK024, BYK028, BYK093, BYK024, and BYK028,
Airex 901W、
Airex 902W、
Foamex825、
At least one of DF677, DAPRO DF 1760; preferably Surfynol AD01, Surfynol AD20, FoamStar ST 2400, BYK024, and,
Airex 902W、
At least one of Foamex825 and DAPRO DF 1760.
The invention considers that in order to further improve the defoaming effect, the defoaming agent of the system is preferably compounded by two types of defoaming agents, one type eliminates larger bubbles, and the other type eliminates smaller bubbles.
Wetting agent
In the present invention, the wetting agent is 0.3 to 0.8 part by weight in the main agent a, and 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, and the like can be mentioned.
In the present invention, the source of the wetting agent is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, as the wetting agent, polyether-modified siloxanes, acetylenic diols and the like can be mentioned.
In the present invention, the source of the wetting agent is not particularly limited, and commercially available Surfynol 104BC, Hydropalat WE 3220, Hydropalat WE 3229, BYK345, BYK346, BYK348, and BYK,
Wet 240、
Wet 270、
Wet 280、
Twin 4100、Dow
67 Additive.
Thickening agent
In the present invention, the thickener is 0.5 to 1 part by weight in the main agent a, and 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part and the like can be mentioned.
In the present invention, the thickener is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, mention may be made, as thickeners, of polyurethane associative type, montmorillonite mineral, polyurea, polyamide wax, fumed silica, and the like.
In the present invention, the source of the thickener is not particularly limited, and commercially available VP disp.WF7620, ViscoPlus3030, ViscoPlus3060, Ming Ling PUR42, PUR44, Haimines
HX6008、
350D、
299. At least one of DeuRheo WT-108, DeuRheo WT-105A, Laponite AQ, BYK420, AQ600, AQ 633E; preferably at least one of VP disp.WF7620, ViscoPlus3060, DeuRheo WT-105A.
pH regulator
In the present invention, the pH adjuster is 0 to 0.5 parts by weight of the main agent a, and 0 part, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, and the like can be mentioned.
In the present invention, the pH adjuster is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, as the pH adjusting agent, one of 2-amino-2-methyl-1-propanol (AMP-95) and Dimethylethanolamine (DMEA) may be mentioned.
Catalyst and process for preparing same
In the present invention, the catalyst is 0 to 0.2 part by weight, and 0 part, 0.1 part, 0.12 part, 0.14 part, 0.16 part, 0.18 part, 0.20 part, etc. may be mentioned.
In the present invention, the catalyst is not particularly limited, and is well known to those skilled in the art.
In a preferred embodiment, the catalyst is selected from commercially available catalysts
LH10，
One of Kat 24.
In the invention, the preparation method of the main agent A comprises the following steps:
(1) adding a certain amount of water into a reaction kettle under stirring, sequentially adding the aqueous acrylic emulsion, the polyester polyol, the aqueous polyurethane resin and the aqueous styrene-acrylic emulsion, then adding a certain amount of water and the film-forming aid, and finally adding the pH regulator to regulate the pH to 8-9;
(2) adding matting powder and part of defoaming agent while stirring, and stirring at high speed for 20-30 min; the rotating speed is not lower than 1000 rpm/min;
(3) reducing the rotating speed to 400-800rpm/min, adding a certain amount of color paste, and then adding a certain amount of water and a film-forming aid;
(4) adding the rest defoaming agent and wetting agent, stirring at the rotating speed of 400-800rpm/min for 20-60min, and then adding a certain amount of water;
(5) adding a catalyst, stirring at the rotating speed of 400-800rpm/min for 20-60min, and adding the balance of water;
(6) adding thickener to adjust viscosity to 20-30s (DIN4#, 25 deg.C).
Curing agent B
In the present invention, the hardener B includes at least an isocyanate curing agent and a diluent.
In a preferred embodiment, the weight ratio of the isocyanate curing agent to the diluent is (1-5): 1.
in a more preferred embodiment, the weight ratio of the isocyanate curing agent to the diluent is (2-4: 1.
Isocyanate curing agent
In the invention, the isocyanate curing agent is HDI-trimer.
In a preferred embodiment, the content of isocyanate groups in the HDI trimer is from 5 to 25% by weight.
In a preferred embodiment, the source of the HDI trimer is not particularly limited, and commercially available HDI trimers can be mentioned
278、
270. Bayhydur XP 2655, Easaqua TMXD803, Easaqua TMXL600, AQ-100R2 and C-AQ-200.
Diluent
In the present invention, the diluent is not particularly limited and is well known to those skilled in the art.
In a preferred embodiment, as the diluent, at least one of propylene glycol monomethyl ether acetate (PMA) and Propylene Glycol Diacetate (PGDA) may be mentioned.
In the invention, the preparation method of the bi-component PU coating comprises the following steps: and (3) uniformly mixing the main agent A and the hardening agent B to obtain the adhesive.
The second aspect of the invention provides the application of the bi-component PU coating to the surface decoration of plastics and metals.
In a preferred embodiment, the two-component PU coating is applied to the surface decoration of plastic and metal substrates under the following construction conditions: spraying at 15-30 deg.C and 40-70% RH, leveling at room temperature for 3-5min, and baking at 80 + -5 deg.C for 30-40 min.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
Embodiment 1 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: water-based acrylic emulsion (Kesichuang)
A145, hydroxyl content 3.3 wt.%) 54.36 parts; 5.3 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); aqueous polyurethane dispersions (Wanhua chemistry)
6512, hydroxyl content 1.5 wt.%) 11.5 parts; 8.69 parts of water-based styrene-acrylic emulsion (XK 85); 0.45 part of pH regulator (DMEA); 2.4 parts of matting powder (OK 520); defoaming agent (
Airex901W) 0.6 part; 0.2 part of defoaming agent (Surfynol AD 20); 0.78 part of wetting agent (Surfynol 104 BC); 5.2 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2.3 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.15 part; 3.63 parts of deionized water; 0.84 part of thickener (ViscoPlus 3060);
the preparation method of the component A comprises the following steps:
(1) under stirring, adding a certain amount of deionized water into a reaction kettle, sequentially adding aqueous acrylic emulsion, polyester polyol, aqueous polyurethane dispersoid and aqueous styrene-acrylic emulsion, then adding a certain amount of water and dipropylene glycol butyl ether, and finally adding DMEA to adjust the pH to 8-9;
(2) adding matting powder and part of defoaming agent while stirring, and stirring at high speed for 30 min; the rotating speed is not lower than 1000 rpm/min;
(3) reducing the rotating speed to be below 800rpm/min, adding a certain amount of color paste, and then adding a certain amount of water and dipropylene glycol methyl ether;
(4) adding the rest defoaming agent and wetting agent, stirring at the rotating speed of 600rpm/min for 30min, and then adding a certain amount of water;
(5) adding a catalyst, stirring at the rotating speed of 600rpm/min for 30min, and adding the balance of water;
(6) adding a thickening agent, and uniformly stirring to obtain the water-based paint; the viscosity of the main agent A is 25.8s (DIN4#, 25 ℃);
curing agent B
The hardener B is PGDA diluent of 30 wt% curing agent Bayhydur XP 2655;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on tinplate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 35 mu m.
Example 2
Embodiment 2 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 44.36 parts of water-based acrylic emulsion (Zhanxin Setaqua6515, hydroxyl content 3.3 wt%); 12.3 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); aqueous polyurethane dispersions (Wanhua chemistry)
6512 hydroxyl content 1.5 wt.%) 5.5 parts; water-based styrene-acrylic8.69 parts of emulsion (XK 85); 0.35 part of pH regulator (DMEA); 4.8 parts of matting powder (OK 520); defoaming agent (
Airex901W)0.4 part; 0.2 part of defoaming agent (Surfynol AD 20); 0.42 part of wetting agent (Surfynol 104 BC); 14.8 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2.5 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.16 part; 1.28 parts of water; 0.64 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 26.2s (DIN4#, 25 ℃);
curing agent B
The hardener B is PGDA diluent of 30 wt% curing agent Bayhydur XP 2655;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying on an ABS/PC substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 35 mu m.
Example 3
Embodiment 3 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 38.76 parts of water-based acrylic emulsion (Zhanxin Setaqua6511, hydroxyl content 4.2 wt%); 14.6 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); aqueous polyurethane dispersions (Wanhua chemistry)
6512 hydroxyl content 1.5%) 5.2 parts; 14.29 parts of water-based styrene-acrylic emulsion (XK 85); 0.42 part of pH regulator (DMEA); xiaoxiao (medicine for eliminating cough and asthma)4.2 parts of light powder (MATT 3400); 0.42 part of defoaming agent (BYK 024); 0.18 part of defoaming agent (Surfynol AD 20); 0.38 parts of wetting agent (Surfynol 104 BC); 8.2 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 3.8 parts of a film-forming aid (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.12 part; 4.99 parts of water; 0.84 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 28.3s (DIN4#, 25 ℃);
curing agent B
The hardener B is 30 weight percent of curing agent
278 of a PGDA diluent;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying on an ABS substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 42 micrometers.
Example 4
Embodiment 4 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: aqueous acrylic emulsion (DSM)
XK-540, hydroxyl content 4.2 wt.%) 22.56 parts; 9.8 parts of polyester polyol (New Tuopan new material T2100S, hydroxyl content 90-120mgKOH/g, 100% solid content); 14.4 parts of aqueous polyurethane dispersion (DSM NeoRez R-1000); 5.09 parts of water-based styrene-acrylic emulsion (XK 98); 0.3 part of pH regulator (DMEA); 5.4 parts of matting powder (K500); 0.2 part of defoaming agent (FoamStar ST 2454); 0.2 part of defoaming agent (Surfynol AD 20); 0.3 part of wetting agent (Surfynol 104 BC); 13.2 parts of color paste; 2 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.05 part; 25.99 parts of water; 0.51 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 27.9s (DIN4#, 25 ℃);
curing agent B
The hardener B is PMA diluent of 20 wt% of curing agent Easaqua TMXL 600;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on a carbon steel substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 36 micrometers.
Example 5
Embodiment 5 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 38.76 parts of aqueous acrylic emulsion (Wanhua chemical Antkote2043, hydroxyl content 4.2 wt%); 8.6 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); aqueous polyurethane dispersion (A)
PD804)14.2 parts; 5.29 parts of water-based styrene-acrylic emulsion (XK 85); AMP-950.45 parts as a pH regulator; 2.4 parts of matting powder (MATT 3400); 0.38 parts of defoaming agent (FoamStar ST 2454); 0.12 part of defoaming agent (Surfynol AD 20); 0.36 part of wetting agent (Surfynol 104 BC); 10.2 parts of color paste; 3.6 parts of a film-forming additive (propylene glycol butyl ether PNB); 3.8 parts of a film-forming aid (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.08 part; 10.92 parts of water; 0.84 part of thickener (VP disp.WF7620);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 26.7s (DIN4#, 25 ℃);
curing agent B
The hardener B is 20 weight percent of curing agent
270 PMA dilution;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on an aluminum alloy substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 36 micrometers.
Example 6
Embodiment 6 provides a two-component PU coating comprising a base agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 35.56 parts of water-based acrylic emulsion (Tongde resin 3AH0595W, hydroxyl content 5.0 wt%); 14.8 parts of polyester polyol (New Tuopan new material T2100S, hydroxyl content 90-120mgKOH/g, 100% solid content); 6.4 parts of aqueous polyurethane dispersion (DSM NeoRez R-1000); 5.09 parts of water-based styrene-acrylic emulsion (XK 98); 0.28 part of pH regulator (DMEA); 2.1 parts of matting powder (K500); 0.2 part of defoaming agent (FoamStar ST 2454); defoaming agent (
Foamex825)0.2 part; 0.42 part of wetting agent (Hydropalat WE 3220); 5 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2 parts of a film-forming additive (dipropylene glycol methyl ether DPM); 1.8 parts of propylene glycol methyl ether (PM); catalyst (A)
LH10)0.05 part; 21.99 parts of water; 0.51 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 28.1s (DIN4#, 25 ℃);
curing agent B
The hardener B is PMA diluent of 30 wt% of curing agent Easaqua TMXL 600;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on a stainless steel substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 40 micrometers.
Comparative example 1
Comparative example 1 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: water-based acrylic emulsion (Kesichuang)
A145, hydroxyl content 3.3 wt.%) 54.36 parts; aqueous polyurethane dispersions (Wanhua chemistry)
6512, hydroxyl content 1.5 wt.%) 11.5 parts; 8.69 parts of water-based styrene-acrylic emulsion (XK 85); 0.45 part of pH regulator (DMEA); 2.4 parts of matting powder (OK 520); defoaming agent (
Airex901W) 0.6 part; 0.2 part of defoaming agent (Surfynol AD 20); 0.78 part of wetting agent (Surfynol 104 BC); 5.2 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2.3 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.15 part; 8.93 parts of water; 0.84 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 28.8s (DIN4#, 25 ℃);
curing agent B
The hardener B is PMA diluent of 30 wt% of curing agent Easaqua TMXL 600;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying on an ABS substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 35 microns.
Comparative example 2
Comparative example 2 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 44.36 parts of water-based acrylic emulsion (Zhanxin Setaqua6515, hydroxyl content 3.3 wt%); 12.3 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); 8.69 parts of water-based styrene-acrylic emulsion (XK 85); 0.35 part of pH regulator (DMEA); 4.8 parts of matting powder (OK 520); defoaming agent (
Airex901W)0.4 part; 0.2 part of defoaming agent (Surfynol AD 20); 0.42 part of wetting agent (Surfynol 104 BC); 14.8 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2.5 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.16 part; 6.78 parts of water; 0.64 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 26.2s (DIN4#, 25 ℃);
curing agent B
The hardener B is PGDA diluent of 30 wt% curing agent Bayhydur XP 2655;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on tinplate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 35 mu m.
Comparative example 3
Comparative example 3 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 38.76 parts of water-based acrylic emulsion (Zhanxin Setaqua6511, hydroxyl content 4.2 wt%); 14.6 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); aqueous polyurethane dispersions (Wanhua chemistry)
6512 hydroxyl content 1.5 wt.%) 5.2 parts; 0.42 part of pH regulator (DMEA); 4.2 parts of matting powder (MATT 3400); 0.42 part of defoaming agent (BYK 024); 0.18 part of defoaming agent (Surfynol AD 20); 0.38 parts of wetting agent (Surfynol 104 BC); 8.2 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 3.8 parts of a film-forming aid (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.12 part; 19.28 parts of water; 0.84 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 25.7s (DIN4#, 25 ℃);
curing agent B
The hardener B is 20 weight percent of curing agent
270 PMA dilution;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on an aluminum alloy substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 36 micrometers.
Comparative example 4
Comparative example 4 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: aqueous solution38.76 parts of acrylic emulsion (Wanhua chemical Antkote2043, hydroxyl content 4.2 wt%); 8.6 parts of polyester polyol (Dezele W' Pol1181/03, hydroxyl content of 310-350mgKOH/g, 100% solid content); 14.2 parts of water-based epoxy emulsion (Handai chemical HDE 8117-WB); 5.29 parts of water-based styrene-acrylic emulsion (XK 85); 0.45 part of pH regulator (AMP-95); 2.4 parts of matting powder (MATT 3400); 0.38 parts of defoaming agent (FoamStar ST 2454); 0.12 part of defoaming agent (Surfynol AD 20); 0.36 part of wetting agent (Surfynol 104 BC); 10.2 parts of color paste; 3.6 parts of a film-forming additive (propylene glycol butyl ether PNB); 3.8 parts of a film-forming aid (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.08 part; 10.92 parts of water; 0.84 part of thickener (VP disp.WF7620);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 26.5s (DIN4#, 25 ℃);
curing agent B
The hardener B is 20 weight percent of curing agent
270 PMA dilution;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on an aluminum alloy substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 37 micrometers.
Comparative example 5
Comparative example 5 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: aqueous acrylic emulsion (DSM)
XK-540, hydroxyl content 4.2%) 22.56 portions; aqueous epoxy emulsion (Hansen EPIKOTE)TMResin 6529-WH-57A)9.8 parts; 14.4 parts of aqueous polyurethane dispersion (DSM NeoRez R-1000); water-based styrene-acrylic emulsion5.09 parts of liquid (XK 98); 0.3 part of pH regulator (DMEA); 5.4 parts of matting powder (K500); 0.2 part of defoaming agent (FoamStar ST 2454); 0.2 part of defoaming agent (Surfynol AD 20); 0.3 part of wetting agent (Surfynol 104 BC); 13.2 parts of color paste; 2 parts of a film-forming additive (dipropylene glycol methyl ether DPM); catalyst (A)
LH10)0.05 part; 25.99 parts of water; 0.51 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 25.8s (DIN4#, 25 ℃);
curing agent B
The hardener B is PMA diluent of 30 wt% of curing agent Easaqua TMXL 600;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying on an ABS substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 35 microns.
Comparative example 6
Comparative example 6 provides a two-component PU coating comprising a main agent a and a hardener B;
the main agent A comprises the following components in parts by weight: 35.56 parts of water-based acrylic emulsion (Tongde resin 3AH0595W, hydroxyl content 5.0 wt%); 14.8 parts of polyester polyol (New Tuopan new material T2100S, hydroxyl content 90-120mgKOH/g, 100% solid content); 6.4 parts of aqueous polyurethane dispersion (DSM NeoRez R-1000); aqueous epoxy emulsion (Hansen EPIKOTE)TMResin 6529-WH-57A)5.09 parts; 0.28 part of pH regulator (DMEA); 2.1 parts of matting powder (K500); 0.2 part of defoaming agent (FoamStar ST 2454); defoaming agent (
Foamex825)0.2 part; 0.42 part of wetting agent (Hydropalat WE 3220); 5 parts of color paste; 3.6 parts of a film-forming additive (dipropylene glycol butyl ether DPNB); 2 parts of a film-forming additive (dipropylene glycol methyl ether DPM); 1.8 parts of propylene glycol methyl ether (PM); catalyst (A)
LH10)0.05 part; 21.99 parts of water; 0.51 part of thickener (ViscoPlus 3060);
the preparation method of the component A is the same as that of the component A in example 1, and the viscosity of the obtained main agent A is 28.1s (DIN4#, 25 ℃);
curing agent B
The hardener B is PMA diluent of 30 wt% of curing agent Easaqua TMXL 600;
the preparation and construction method of the two-component coating comprises the following steps: preparing a main agent A and a hardening agent B according to a mass ratio of 5: 1, uniformly stirring, spraying the mixture on a stainless steel substrate, standing at room temperature for 5min, baking at 80 ℃ for 30min, and obtaining a prepared sample plate, wherein the thickness of a dry film is 40 micrometers.
Performance testing
The panels prepared in the examples and comparative examples were tested for adhesion, hardness, impact resistance, water resistance, and sunscreen resistance, and the results are shown in table 1.
(1) Flexibility (impact resistance)
The test method comprises the following steps: the DU PONT impactor was used to impact the steel plate with a force of 1kg and a height of 50cm in the forward and reverse directions.
The judging method comprises the following steps: the paint film has no obvious cracking, peeling and the like.
(2) Water resistance
And (3) testing conditions are as follows: (40 +/-3) deg.c, 100% RH;
the judging method comprises the following steps: the paint film has no bubble, peeling and other abnormalities and adhesive force grade.
(3) Adhesion test
The coating formed by the prepared water-based paint is subjected to an adhesion test according to the marking test standard of national standard GB9286-1998 colored paint and varnish paint films.
(4) Hardness test
The test method comprises the following steps: trolley type pencil scratch tester (load 750g)
1. Hardness of the Chinese-style pencil: the diameter of the pencil point of the metal substrate 3H, the plastic substrate 2H and the pencil is 0.4-0.55 mm.
2. The pencil and the surface to be measured of the part are 45 degrees, the pulley linearly advances on the surface of the part along the inclined direction of the pencil for more than 25mm, five straight lines need to be drawn, the pencil needs to be replaced or the pencil point needs to be sharpened after every two lines are drawn, and the diameter of the pencil point is ensured to be 0.4-0.55 mm.
The judging method comprises the following steps: at least more than 3 of the 5 parallel scratches have no obvious mark.
(5) Cosmetic product
The test method comprises the following steps:
a. covering the surface of the sample with gauze, coating the surface of the gauze with the reagent, uniformly coating the reagent on the surface of the sample by extrusion, and removing the redundant reagent;
b. placing the assembly in an environment of 80 ℃ for 24h, stripping off gauze, and wiping off the residual reagent on the surface of the sample by using the gauze;
c. the surface of the sample was evaluated after standing at room temperature for 4 hours, and then the following tests were performed:
and (3) adhesion test: DIN EN ISO 2409, 6X 6 parallel scoring at a spacing of 1mm, using Tesa 4657 tape;
the judging method comprises the following steps:
appearance: no obvious color or touch change (such as fishtail lines, blistering, swelling, cracks, softening, stickiness and the like), slight gloss increase change, and the sample surface is more than or equal to grade 4 according to DIN EN 20105-A02;
adhesion test rating: not more than grade 1;
TABLE 1 results of Performance test of examples and comparative examples
As can be seen from table 1, the resin components of the present invention exert their respective advantages by the design and matching of the formula, and all the performance characteristics can be combined without weakening, thereby generating a synergistic effect, and finally presenting a better overall performance effect, the water-based acrylic emulsion provides excellent fullness and hardness, the polyester polyol provides better flexibility and chemical resistance, the water-based polyurethane provides excellent elasticity, and the water-based styrene-acrylic emulsion provides better wetting effect and excellent adhesion on metal substrates such as aluminum alloy, stainless steel, etc. The results of the performance tests of the examples confirm that the PU coating prepared by the invention has excellent hardness and flexibility, and simultaneously has excellent water resistance and cosmetic resistance.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (16)
1. A two-component PU coating is characterized by comprising a main agent A and a hardening agent B; the molar ratio of hydroxyl in the main agent A to isocyanate in the hardener B is 1: (1.2-1.5);
the preparation raw materials of the main agent A comprise: at least two waterborne acrylic resins, at least one waterborne polyurethane resin, at least one polyester polyol, an auxiliary agent and water;
the hardener B at least comprises an isocyanate curing agent and a diluent.
2. The two-component PU coating according to claim 1, wherein the aqueous acrylic resin is selected from the group consisting of aqueous acrylic emulsion, aqueous styrene-acrylic emulsion, aqueous silicone-acrylic emulsion, and aqueous fluorocarbon emulsion.
3. The two-component PU coating according to claim 2, wherein the aqueous acrylic emulsion has a hydroxyl content of 1 to 5 wt.%.
4. The two-component PU coating according to claim 2, wherein the weight average molecular weight of the aqueous acrylic emulsion is 5000-100000.
5. The two-component PU coating according to claim 2, wherein the weight average molecular weight of the aqueous styrene-acrylic emulsion is 40000-80000.
6. The two-component PU coating according to claim 2, wherein the water-borne styrene-acrylic emulsion has a minimum film-forming temperature of not more than 25 ℃.
7. The two-component PU coating according to claim 2, wherein the weight ratio of the aqueous acrylic emulsion and the aqueous styrene-acrylic emulsion is (4-11): (3-5).
8. The two-component PU coating according to claim 1, wherein the weight average molecular weight of the aqueous polyurethane resin is 50000-300000.
9. The two-component PU coating according to claim 1, wherein the hydroxyl group content of the aqueous polyurethane resin is 0 to 3 wt.%.
10. The two-component PU coating according to claim 1, wherein the polyester polyol is a saturated polyester polyol.
11. The two-component PU coating according to claim 10, wherein the saturated polyester polyol has a hydroxyl content of 1 to 10 wt.%.
12. The two-component PU coating of claim 10, wherein the weight ratio of the aqueous acrylic resin, aqueous polyurethane resin, and polyester polyol is (10-80): (1-20): (1-20).
13. The two-component PU coating according to claim 1, wherein the auxiliary agent comprises at least one of a film forming aid, a wetting agent, a defoaming agent, a matting agent, a thickener, a pH adjusting agent, a catalyst, and a colorant.
14. The two-component PU coating according to claim 1, wherein the hardener B comprises an isocyanate curing agent and a diluent in a weight ratio of (1-5): 1.
15. a two-component PU coating according to claim 14, wherein the isocyanate curing agent is HDI-trimer.
16. Use of a two-component PU coating according to any of claims 1 to 15 for the surface decoration of plastics and metals.
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| CN114292575A (en) * | 2021-12-24 | 2022-04-08 | 芜湖春风新材料有限公司 | Boiling-resistant sunscreen cream-resistant waterborne polyurethane coating for automotive interior and preparation method and use method thereof |
| CN114539895A (en) * | 2021-10-29 | 2022-05-27 | 惠州飞凯新材料有限公司 | Water-based PU (polyurethane) coating and coating process |
| CN115537107A (en) * | 2022-09-27 | 2022-12-30 | 厦门双瑞船舶涂料有限公司 | Ice-water-coating-preventing polyurethane finish paint for wind power blade and preparation method thereof |
| CN115851099A (en) * | 2022-12-28 | 2023-03-28 | 广州亦盛环保科技有限公司 | Water-based two-component coating for plastics and preparation method and application thereof |
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| CN114539895A (en) * | 2021-10-29 | 2022-05-27 | 惠州飞凯新材料有限公司 | Water-based PU (polyurethane) coating and coating process |
| CN114292575A (en) * | 2021-12-24 | 2022-04-08 | 芜湖春风新材料有限公司 | Boiling-resistant sunscreen cream-resistant waterborne polyurethane coating for automotive interior and preparation method and use method thereof |
| CN115537107A (en) * | 2022-09-27 | 2022-12-30 | 厦门双瑞船舶涂料有限公司 | Ice-water-coating-preventing polyurethane finish paint for wind power blade and preparation method thereof |
| CN115537107B (en) * | 2022-09-27 | 2024-02-09 | 厦门双瑞船舶涂料有限公司 | Wind power blade ice-coating-preventing water polyurethane finish paint and preparation method thereof |
| CN115851099A (en) * | 2022-12-28 | 2023-03-28 | 广州亦盛环保科技有限公司 | Water-based two-component coating for plastics and preparation method and application thereof |
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Application publication date: 20210518 |