CN113604143A - Two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and preparation method thereof - Google Patents
Two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and preparation method thereof Download PDFInfo
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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
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- 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 discloses a two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and a method thereof, wherein the coating comprises a main agent and a waterborne isocyanate curing agent; the main agent comprises: the water-based polyurethane resin comprises water-based polyurethane resin, polyether graft polysiloxane containing two terminal hydroxyl groups, a film forming agent, a dispersing agent, an auxiliary agent and a cosolvent. According to the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and the preparation method thereof, the coating has good hardness, adhesive force, wear resistance and no back adhesion; polyether grafted polysiloxane (Silicone-9350, an organic silicon slip agent) containing two terminal hydroxyl groups is added, wherein the structure of the polyether grafted polysiloxane contains hydroxyl groups, the hydroxyl groups can react with a water-based isocyanate curing agent component after being uniformly mixed to form a net-shaped structure, and a siloxane structure is introduced into the coating structure, so that the polyether grafted polysiloxane is uniformly distributed in the coating, and the scratch resistance, the adhesion resistance, the doodling resistance and the wear resistance of the coating are obviously improved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and a preparation method thereof.
Background
With the stricter and stricter national requirements on environmental protection, the decoration industry and the furniture industry are integrally transformed into water-based and solvent-free types. The traditional paint spraying process in the decoration industry and the furniture industry is complicated, polishing is needed for many times after painting or spraying, and the definition of pattern texture and the like are difficult to ensure. Therefore, the paint-free film is provided in the market, can replace the traditional coating and spraying process, and can be directly attached to the base material through the plastic uptake process. The paint-free film has the advantages of no color difference on the surface, natural texture, fine texture, uniform structure, exquisite shape and good wear resistance, washing resistance, corrosion resistance and acid and alkali resistance.
Most of coatings for manufacturing a paint-free film in the current market are solvent type polyurethane coatings, and the current environmental protection requirements are difficult to adapt. In order to realize the water-based transformation of the industry, water-based paint and water-based coating are also available, but the existing water-based paint generally has the defects of low solid content, insufficient scratch resistance, abrasion resistance, adhesive force and anti-back tack performance, and cannot completely meet the market demand.
Patent CN109135539A discloses a water-based high-light-resistance blade coating and a preparation process thereof, and specifically discloses the water-based high-light-resistance blade coating and the preparation process thereof, wherein the water-based high-light-resistance blade coating comprises the following components in percentage by mass: 1-88% of aqueous elastic polycarbonate, 2-90% of aqueous polyurethane, 1-20% of a brightener, 0.1-1% of a pH regulator, 0.2-0.9% of a wetting leveling agent, 0.5-8% of a curing agent, 0.5-3% of a scratch-resistant agent and 1-65% of a cosolvent. According to the invention, the performances of high weather resistance, no yellowing and durable elasticity of the coating are improved by adding the aqueous elastic polycarbonate, but the scratch resistance and wear resistance of the resin are poor, so that the scratch resistance and wear resistance of the coating are improved by adding the silicone oil or the organic silicon modified polymer in the formula. However, the organic silicone oil, the hand feeling agent and other additives are directly added into the paint for modification, and the added main agents naturally free and run off from the coating and the paint layer along with the passage of time, so that the performances of scratch resistance, abrasion resistance, dirt resistance and the like of the coating and the paint layer are greatly reduced, and the effect is not durable.
Disclosure of Invention
The invention provides a two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and a preparation method thereof.
The invention adopts the following technical scheme for solving the technical problems:
a two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating is characterized by comprising a main agent and a waterborne isocyanate curing agent;
the main agent comprises: the water-based polyurethane resin comprises water-based polyurethane resin, polyether graft polysiloxane containing two terminal hydroxyl groups, a film forming agent, a dispersing agent, an auxiliary agent and a cosolvent.
Preferably, the weight ratio of the main agent to the water-based isocyanate curing agent is 10: 0.1 to 0.5.
As a preferable scheme, the weight ratio of the waterborne polyurethane resin, the polyether graft polysiloxane containing two terminal hydroxyl groups, the film forming agent, the dispersing agent, the auxiliary agent and the cosolvent is 50-80: 0.4-1.8: 0.8-2: 0.2-0.5: 2.2-5.2: 6-16.
Preferably, the aqueous polyurethane resin comprises 100 parts by weight of aqueous self-extinction aliphatic polyurethane resin and 10-20 parts by weight of aqueous aliphatic polyurethane resin.
As a preferable scheme, the waterborne self-extinction aliphatic polyurethane resin is one or more of PU-580E, SDPU-590, SDPU-500, SDPU-550, SDPU-YN, PU-980, P-1010 and GSB 01-81;
as a most preferred scheme, the aqueous self-extinction aliphatic polyurethane resin is PU-580E. The PU-580E waterborne self-extinction aliphatic polyurethane resin has high shading degree and good transparency; the rubber elastic hand feeling is provided, and the touch feeling is strong; the paint is dry and wet rub resistant, and has excellent chemical resistance; excellent post-repairability; the scratch resistance is good; and the cable is resistant to white electric oil.
The waterborne aliphatic polyurethane resin is one or more of PUD6721, PUD6719 and PUD 6719H.
As a most preferable mode, the aqueous aliphatic polyurethane resin is PUD 6721. The PUD6721 aqueous aliphatic polyurethane resin has dry and comfortable hand feeling and is not sticky; good miscibility with waterborne polyurethane, acrylic acid and the like, good compatibility with wax emulsion and strong adhesion to PVC.
As a preferable scheme, the polyether grafted polysiloxane containing two terminal hydroxyl groups is a reactive Silicone slip agent, namely Silicone-9350.
The inventor of the invention has found through extensive research that a coating with dry, non-sticky hand feeling and good scratch resistance can be prepared by adopting the aqueous self-extinction aliphatic polyurethane resin and the aqueous aliphatic polyurethane resin as the main agents, specifically, the aqueous aliphatic polyurethane resin is PUD6721, and the aqueous self-extinction aliphatic polyurethane resin is PU-580E.
The inventor finds that the waterborne polyurethane resin comprises 100 parts by weight of PU-580E waterborne self-extinction aliphatic polyurethane resin and 10-20 parts by weight of PUD6721 waterborne aliphatic polyurethane resin. Compared with other water-based aliphatic polyurethane resins and water-based self-extinction aliphatic polyurethane resins, the polyurethane resin has better comprehensive performance in the weight portion ratio.
Under the formula system of the invention, namely under the system of adopting PU-580E waterborne self-extinction aliphatic polyurethane resin, PUD6721 waterborne aliphatic polyurethane resin and cosolvent adopting N, N-dimethyl formamide, polyether grafted polysiloxane (Silicone-9350, organic silicon slip agent) containing two terminal hydroxyl groups is added, wherein the structure of the polyether grafted polysiloxane contains hydroxyl groups, the hydroxyl groups can react with a waterborne isocyanate curing agent component after being uniformly mixed to form a net structure, a siloxane structure is introduced into the coating structure, and the structure enables the polyether grafted polysiloxane to be uniformly distributed in the coating, so that the scratch resistance, the doodling resistance and the anti-blocking performance of the coating are obviously improved, and the inventor finds that the effect can not be achieved by adopting other organic silicon slip agents.
Preferably, the film forming agent is dipropylene glycol methyl ether, and one or more of ethylene glycol butyl ether, diethylene glycol butyl ether and dodecyl alcohol ester can be used.
As a most preferred embodiment, the film former is dipropylene glycol methyl ether. Auxiliary film formation, and blending with PUD 6721.
Preferably, the dispersant is 7155W vinyl resin type amide polymer dispersant. The dispersing agent can improve the dispersibility and the stability of the emulsion, and has good viscosity reduction and color development performances.
As a preferable scheme, the auxiliary agent comprises a wetting agent, a leveling agent, a defoaming agent and a lubricating agent;
as a preferred embodiment, the lubricant is polytetrafluoroethylene wax; the polytetrafluoroethylene wax can adjust the speed of the marker post of the coating, so that the marker post does not stick back, and the coating and the printing ink have good smoothness and scratch resistance.
As a preferable scheme, the wetting agent is one or two of a Twin4100 wetting agent and a Twin4000 wetting agent.
As a preferable scheme, the leveling agent is a Glide450 leveling agent; the leveling property is improved, and the smooth hand feeling is improved.
As a preferable scheme, the defoaming agent is Silok 4600 defoaming agent. The inventor finds that under the formula system of the invention, a non-silicon defoaming agent is required to be used, otherwise, the leveling property is influenced, and the Silok 4600 defoaming agent is a mineral oil-based composite type water-based defoaming agent, is not easy to foam and has extremely high foam breaking speed.
As a most preferred embodiment, the cosolvent is N, N-dimethylformamide. The water-based polyurethane resin is used for adjusting the leveling property, and if the leveling property of the replaced cosolvent is obviously reduced, the water-based polyurethane resin is matched with the water-based polyurethane resin for use.
Preferably, the aqueous isocyanate curing agent is one or more of an aqueous HDI curing agent, an aqueous MDI curing agent, an aqueous IPDI curing agent and an aqueous TDI curing agent.
The invention also provides a preparation method of the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating, which comprises the following steps:
s1, adding the waterborne polyurethane resin, the cosolvent and the dispersing agent into a reaction kettle, uniformly mixing, and adding the polyether graft polysiloxane containing two terminal hydroxyl groups, the film-forming agent and the auxiliary agent to obtain a main agent;
s2, uniformly mixing the main agent and the water-based isocyanate curing agent to obtain the two-component water-based polyurethane scratch-resistant wear-resistant PVC coating.
The invention has the beneficial effects that: according to the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating and the preparation method thereof, the coating has good hardness, adhesive force, wear resistance and no back adhesion; under the system that PU-580E waterborne self-extinction aliphatic polyurethane resin, PUD6721 waterborne aliphatic polyurethane resin and cosolvent are N, N-dimethylformamide, polyether grafted polysiloxane (Silicone-9350, an organic silicon slip agent) containing two terminal hydroxyl groups is added, wherein the structure of the polyether grafted polysiloxane contains hydroxyl groups, the hydroxyl groups can react with a waterborne isocyanate curing agent component after being uniformly mixed to form a net-shaped structure, and a siloxane structure is introduced into the coating structure, so that the polyether grafted polysiloxane is uniformly distributed in the coating, and the scratch resistance, adhesion resistance, doodling resistance and wear resistance of the coating are obviously improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the parts are all parts by weight unless otherwise specified.
Example 1
A two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises, by weight, 10 parts of a main agent and 0.3 part of a waterborne HDI curing agent;
the main agent comprises the following components in parts by weight: 115g of aqueous polyurethane resin, 1.1g of polyether graft polysiloxane containing two terminal hydroxyl groups, 2g of film forming agent, 0.5g of dispersing agent, 4.7g of auxiliary agent and 17.6g N, N-dimethylformamide.
The aqueous polyurethane resin comprises 100g of PU-580E aqueous self-extinction aliphatic polyurethane resin (Kenture) and 15g of PUD6721 aqueous aliphatic polyurethane resin (Tongde chemical industry).
The polyether grafted polysiloxane containing two terminal hydroxyl groups is a reactive organosilicon slip agent Silicone-9350 (Baiyuan chemical industry).
The film forming agent is dipropylene glycol methyl ether.
The dispersant was 7155W vinyl resin type amide polymer dispersant (siloco).
The auxiliary agent comprises 0.3g of wetting agent, 0.3g of flatting agent, 0.1g of defoaming agent and 4g of lubricating agent;
the lubricant is polytetrafluoroethylene wax (a new Tianshi material);
the wetting agent is a Twin4100 wetting agent (Yingchuanggao);
the leveling agent is a Glide450 leveling agent (Yingchuangdi Gao);
the defoamer is Silok 4600 defoamer (Stocko).
The preparation method of the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises the following steps:
s1, adding the waterborne polyurethane resin, N-dimethylformamide and the dispersing agent into a reaction kettle, uniformly mixing, and then adding the polyether graft polysiloxane containing two terminal hydroxyl groups, the film forming agent and the auxiliary agent to obtain a main agent;
s2, uniformly mixing the main agent and the aqueous HDI curing agent to obtain the double-component aqueous polyurethane scratch-resistant wear-resistant PVC coating.
The two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating prepared by the embodiment is yellowish emulsion with the solid content of 28.7%.
The main agent adopts waterborne self-extinction aliphatic polyurethane resin and waterborne aliphatic polyurethane resin, specifically, the waterborne aliphatic polyurethane resin is PUD6721, the waterborne self-extinction aliphatic polyurethane resin is PU-580E, and the coating with dry, non-sticky hand feeling and good scratch resistance can be prepared.
Under the system that PU-580E waterborne self-extinction aliphatic polyurethane resin, PUD6721 waterborne aliphatic polyurethane resin and cosolvent are N, N-dimethylformamide, polyether grafted polysiloxane (Silicone-9350, an organic silicon slip agent) containing two terminal hydroxyl groups is added, wherein the structure of the polyether grafted polysiloxane contains hydroxyl groups, the hydroxyl groups can react with a waterborne isocyanate curing agent component after being uniformly mixed to form a net-shaped structure, and a siloxane structure is introduced into the coating structure, so that the polyether grafted polysiloxane is uniformly distributed in the coating, and the scratch resistance, adhesion resistance, doodling resistance and wear resistance of the coating are obviously improved.
Example 2
A two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises, by weight, 10 parts of a main agent and 0.3 part of a waterborne HDI curing agent;
the main agent comprises the following components in parts by weight: 10g of waterborne polyurethane resin, 0.8g of polyether grafted polysiloxane containing two terminal hydroxyl groups, 1.6 g of film forming agent, 0.4g of dispersing agent, 4.4g of auxiliary agent and 12g N, N-dimethylformamide.
The aqueous polyurethane resin comprises 100g of PU-580E aqueous self-extinction aliphatic polyurethane resin (Kenture) and 10g of PUD6721 aqueous aliphatic polyurethane resin (Tongde chemical industry).
The polyether grafted polysiloxane containing two terminal hydroxyl groups is a reactive organosilicon slip agent Silicone-9350 (Baiyuan chemical industry).
The film forming agent is dipropylene glycol methyl ether.
The dispersant was 7155W vinyl resin type amide polymer dispersant (siloco).
The auxiliary agent comprises 0.2g of wetting agent, 0.2g of flatting agent, 0.1g of defoaming agent and 3.9g of lubricating agent;
the lubricant is polytetrafluoroethylene wax (a new Tianshi material);
the wetting agent is a Twin4100 wetting agent (Yingchuanggao);
the leveling agent is a Glide450 leveling agent (Yingchuangdi Gao);
the defoamer is Silok 4600 defoamer (Stocko).
The preparation method of the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises the following steps:
s1, adding the waterborne polyurethane resin, N-dimethylformamide and the dispersing agent into a reaction kettle, uniformly mixing, and then adding the polyether graft polysiloxane containing two terminal hydroxyl groups, the film forming agent and the auxiliary agent to obtain a main agent;
s2, uniformly mixing the main agent and the aqueous HDI curing agent to obtain the double-component aqueous polyurethane scratch-resistant wear-resistant PVC coating.
The two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating prepared by the embodiment is yellowish emulsion with the solid content of 27.3%.
Example 3
A two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises, by weight, 10 parts of a main agent and 0.3 part of a waterborne HDI curing agent;
the main agent comprises the following components in parts by weight: 120g of waterborne polyurethane resin, 2.7g of polyether grafted polysiloxane containing two terminal hydroxyl groups, 3g of film forming agent, 0.75g of dispersing agent, 5.1g of auxiliary agent and 24g N, N-dimethylformamide.
The polyurethane resin comprises 100g of PU-580E aqueous self-extinction aliphatic polyurethane resin (Kenture) and 20g of PUD6721 aqueous aliphatic polyurethane resin (Germany chemical industry).
The polyether grafted polysiloxane containing two terminal hydroxyl groups is a reactive organosilicon slip agent Silicone-9350 (Baiyuan chemical industry).
The film forming agent is dipropylene glycol methyl ether.
The dispersant was 7155W vinyl resin type amide polymer dispersant (siloco).
The auxiliary agent comprises 0.5g of wetting agent, 0.5g of flatting agent, 0.1g of defoaming agent and 4g of lubricating agent;
the lubricant is polytetrafluoroethylene wax (a new Tianshi material);
the wetting agent is a Twin4100 wetting agent (Yingchuanggao);
the leveling agent is a Glide450 leveling agent (Yingchuangdi Gao);
the defoamer is Silok 4600 defoamer (Stocko).
The preparation method of the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating comprises the following steps:
s1, adding the waterborne polyurethane resin, N-dimethylformamide and the dispersing agent into a reaction kettle, uniformly mixing, and then adding the polyether graft polysiloxane containing two terminal hydroxyl groups, the film forming agent and the auxiliary agent to obtain a main agent;
s2, uniformly mixing the main agent and the aqueous HDI curing agent to obtain the double-component aqueous polyurethane scratch-resistant wear-resistant PVC coating.
The two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating prepared by the embodiment is yellowish emulsion with the solid content of 28.5%.
Example 4
Example 4 is different from example 1 in that the aqueous polyurethane resin described in example 1 is a single PU-580E aqueous self-matting aliphatic polyurethane resin, and acetone is used as a cosolvent instead of N, N-dimethylformamide, but the other steps are the same.
Example 5
Example 5 is different from example 1 in that the aqueous polyurethane resin and the cosolvent described in example 5 are different from example 1, and the other steps are the same.
In this example, the aqueous polyurethane resin includes 80g of SDPU-590 aqueous self-matting aliphatic polyurethane resin (Kenture) and 35g of PUD6719H aqueous aliphatic polyurethane resin (Germany chemical).
In this embodiment, the cosolvent is ethyl isobutyl ketone.
Example 6
Example 6 is different from example 1 in that the aqueous polyurethane resin described in example 6 is different from example 1, and the other points are the same.
In this example, the aqueous polyurethane resin includes 65g of SDPU-500 aqueous self-matting aliphatic polyurethane resin (Kenture) and 50g of PUD6719 aqueous aliphatic polyurethane resin (Germany chemical).
Comparative example 1
Comparative example 1 differs from example 1 in that comparative example 1 does not contain the polyether-grafted polysiloxane containing two terminal hydroxyl groups described, i.e. does not contain the reactive Silicone slip agent Silicone-9350, all other things being equal.
Comparative example 2
Comparative example 2 differs from example 1 in that comparative example 2 uses polyether modified polydimethylsiloxane (BYK-301 Germany Bick) in place of the two hydroxyl terminated polyether graft polysiloxane, all other things being equal.
To further demonstrate the effect of the present invention, the following test methods were provided:
1. the two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating disclosed in the embodiments 1-6 and the comparative examples 1-4 is coated on the surface of a PVC decorative film through a plastic uptake process to form a coating (the thickness is 22 mu m), the performance of the coating is detected, and the test results are shown in Table 1.
GB/1762-1980 determination of the tack-back of paint films;
the hardness of the coating is measured by a GB/T6739-;
the adhesion is determined by the grid test of GB/T9286-1998 color paint and varnish paint films;
GB/T4893.8-1985 tests coatings for abrasion resistance (loss of mass).
TABLE 1
As can be seen from Table 1, the coating of the present invention has the properties of no tack, good hardness, adhesion, abrasion resistance, etc. after coating.
Compared with examples 1 to 3, it can be seen that the optimized two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating has the performances of no tack, good hardness, adhesion, wear resistance and the like after coating, wherein different proportions can influence the hardness, adhesion, wear resistance and the tack condition after coating, and example 1 is the optimal proportion.
It can be seen from comparison of examples 1, 4 and 5 that the hardness, adhesion, abrasion resistance and after-coating tack-back condition can be significantly affected by the selection of the aqueous polyurethane resin and the cosolvent described in example 1, and the hardness, adhesion, abrasion resistance and after-coating tack-back condition can be improved by the use of the aqueous polyurethane resin and the cosolvent described in example 1, and if the aqueous polyurethane resin and the cosolvent are different from example 1, the performance is significantly reduced.
Comparing example 1 with example 6, it is clear that the hardness, adhesion, abrasion resistance and after-coating tack-back are significantly reduced by using the aqueous polyurethane resin different from that described in example 1.
As can be seen from the comparison of example 1 with comparative examples 1 and 2, the addition of the polyether-grafted polysiloxane containing two terminal hydroxyl groups can significantly affect the overall performance of the coating, wherein the polyether-grafted polysiloxane containing two terminal hydroxyl groups can significantly improve the hardness, adhesion, abrasion resistance and after-coating tack.
Under the system that PU-580E aqueous self-extinction aliphatic polyurethane resin, PUD6721 aqueous aliphatic polyurethane resin and cosolvent are N, N-dimethylformamide, polyether grafted polysiloxane (Silicone-9350, an organic silicon slip agent) containing two terminal hydroxyl groups is added, wherein the structure of the polyether grafted polysiloxane contains hydroxyl groups, and the hydroxyl groups can react with an aqueous isocyanate curing agent component after being uniformly mixed to form a net-shaped structure, and a siloxane structure is introduced into the coating structure, so that the polyether grafted polysiloxane is uniformly distributed in the coating, the scratch resistance, adhesion resistance, doodling resistance and wear resistance of the coating are obviously improved, and the inventor finds that the effects cannot be achieved by adopting other organic silicon slip agents.
In light of the foregoing description of preferred embodiments according to the invention, it is clear that many changes and modifications can be made by the person skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A two-component waterborne polyurethane scratch-resistant wear-resistant PVC coating is characterized by comprising a main agent and a waterborne isocyanate curing agent;
the main agent comprises: the water-based polyurethane resin comprises water-based polyurethane resin, polyether graft polysiloxane containing two terminal hydroxyl groups, a film forming agent, a dispersing agent, an auxiliary agent and a cosolvent.
2. The two-component waterborne polyurethane scratch and wear resistant PVC coating according to claim 1, wherein the weight ratio of the main agent to the waterborne isocyanate curing agent is 10: 0.1 to 0.5.
3. The two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating as claimed in claim 1, wherein the weight ratio of the waterborne polyurethane resin, the polyether graft polysiloxane containing two terminal hydroxyl groups, the film forming agent, the dispersing agent, the auxiliary agent and the cosolvent is 50-80: 0.4-1.8: 0.8-2: 0.2-0.5: 2.2-5.2: 6-16.
4. The two-component waterborne polyurethane scratch and wear resistant PVC coating according to claim 1, wherein the waterborne polyurethane resin comprises 100 parts by weight of waterborne self-extinction aliphatic polyurethane resin and 10-20 parts by weight of waterborne aliphatic polyurethane resin.
5. The two-component waterborne polyurethane scratch and wear resistant PVC coating according to claim 4, wherein the waterborne self-extinction aliphatic polyurethane resin is one or more of PU-580E, SDPU-590, SDPU-500, SDPU-550, SDPU-YN, PU-980, P-1010 and GSB 01-81;
the waterborne aliphatic polyurethane resin is one or more of PUD6721, PUD6719 and PUD 6719H.
6. The two-component waterborne polyurethane scratch and abrasion resistant PVC coating according to claim 1, wherein the polyether-grafted polysiloxane containing two terminal hydroxyl groups is a reactive Silicone slip agent Silicone-9350.
7. The two-component waterborne polyurethane scratch and wear resistant PVC coating according to claim 1, wherein the film forming agent is dipropylene glycol methyl ether, and one or more of ethylene glycol butyl ether, diethylene glycol butyl ether and dodecyl alcohol ester can be used;
the dispersant is 7155W vinyl resin type amide polymer dispersant.
8. The two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating according to claim 1, wherein the auxiliary agent comprises a wetting agent, a leveling agent, a defoaming agent and a lubricant;
the lubricant is polytetrafluoroethylene wax;
the wetting agent is one or two of a Twin4100 wetting agent and a Twin4000 wetting agent;
the leveling agent is a Glide450 leveling agent;
the defoaming agent is Silok 4600 defoaming agent.
9. The two-component waterborne polyurethane scratch and wear resistant PVC coating according to claim 1, wherein the waterborne isocyanate curing agent is one or more of a waterborne HDI curing agent, a waterborne MDI curing agent, a waterborne IPDI curing agent and a waterborne TDI curing agent.
10. A preparation method of a two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating, which is used for preparing the two-component waterborne polyurethane scratch-resistant and wear-resistant PVC coating as claimed in any one of claims 1 to 9, and comprises the following steps:
s1, adding the waterborne polyurethane resin, the cosolvent and the dispersing agent into a reaction kettle, uniformly mixing, and adding the polyether graft polysiloxane containing two terminal hydroxyl groups, the film-forming agent and the auxiliary agent to obtain a main agent;
s2, uniformly mixing the main agent and the water-based isocyanate curing agent to obtain the two-component water-based polyurethane scratch-resistant wear-resistant PVC coating.
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