CN101701128B - Water-based two-pack polyurethane preservative coating and preparation method thereof - Google Patents
Water-based two-pack polyurethane preservative coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the preservative coating technology, in particular to a water-based two-pack polyurethane preservative coating and a preparation method thereof. The water-based two-pack polyurethane preservative coating comprises two parts, namely paint vehicle and curing agent, wherein the paint vehicle is prepared from water-based hydroxylated acrylic dispersion, modified resin, pigment, filler, additive and water, the curing agent part comprises hydrophilic aliphatic isocyanate, dodecyl ester and propylene glycol methyl ether acetate. When using the coating of the invention, the weight ratio of the paint vehicle to the curing agent is 74-85:15-26 and the coating can solve the defects of the existing preservative coating.
Description
Technical field
The present invention relates to the protective system technology, relate in particular to a kind of aqueous double-component protective system and preparation method thereof.
Background technology
In order to purify existent environment of people, various countries' environmental law has promoted to be the development of the low-contamination type coating of representative with the water-borne coatings to the strictness restriction of organic volatile in the coating system (VOC) content.Since Beyer Co., Ltd in 1985 initiated the aliphatic isocyanates solidifying agent, the countries in the world polyurethane coating had obtained develop rapidly, and polyurethane coating can be widely used in leather, furniture, automobile, aircraft, surface decorations such as various steel constructions.It is main that present polyurethane coating great majority are still with solvent-borne type, and aqueous polyurethane coating at first is used in the wood furniture surface decoration at home, and leather finish; Most of products are varnish; The colored paint product is also rarely found, and its aqueous polyurethane product is proportion less than 10% also in polyurethane coating, and more American-European developed country's aqueous polyurethane coatings account for more than 30% of whole polyurethane coating; Therefore, also there is very big gap in China's aqueous polyurethane coating with the developed countries ratio.
According to data; China's waterborne polyurethane resin can provide the producer of matured product considerably less; Waterborne polyurethane resin can be made colored paint (two component) and good package stability can be provided; The product of characteristics such as the paint film physical and mechanical properties of demonstration excellence, antiseptic property, water resistance still less; And external famous polyurethane material manufacturing enterprise such as Bayer A.G, inferior water-base polyurethane material and the product that comparative maturity is all arranged in French sieve ground, coating transregional company such as ICI, Zuo Dun also have maturation, advanced person's aqueous polyurethane coating product.
According to data, Bayer aqueous polyurethane coating system was successfully applied to the bubble of National Aquatics Center in 2007, in Europe, and applying waterborne double-component polyurethane coating very early on the rail vehicle.
Fast development along with China railways; The rail vehicles manufacturing has got into unprecedented fast-developing period; Particularly the Large scale construction of high-speed railway and Line for Passenger Transportation makes the motor-car vehicle manufacturing of hi-tech level and is used for global relevant supplier and attractes attention.The application of high-performance environment-friendly novel material will become the development trend that rail vehicles is made the field.Large-scale steel structure engineerings such as existing railway station, departure hall, commerce and trade conference and exhibition center are the public place, and the anticorrosion maintenance that will face from now on also will be selected the coating of high-performance, aqueous environment protection, and therefore, water-borne coatings potential business opportunity is large in number and widely distributed.
Summary of the invention
In order to overcome above-mentioned defective, the technical problem that the present invention will solve is: the deficiency to existing protective system exists provides a kind of water-based two-pack polyurethane preservative coating and preparation method thereof.
In order to overcome the defective that exists in the background technology; The technical solution adopted for the present invention to solve the technical problems is: a kind of water-based two-pack polyurethane preservative coating; Have paint vehicle and solidifying agent two portions; It is formulated that paint vehicle consists of water-based hydroxyl acrylic acid dispersion, modified hydrophilic aminoresin, pigment, filler, auxiliary agent and water, and the mass percent of water-based hydroxyl acrylic acid dispersion is that the mass percent of 45-69%, modified resin is that the mass percent of 2-3%, pigment is that the mass percent of 18-26.5%, filler is that the mass percent of 0.1-15%, auxiliary agent is that the mass percent of 7-8.2%, water is 2.8-12.2% in the paint vehicle; Curing agent part is made up of wetting ability aliphatic isocyanates, the pure and mild 1-Methoxy-2-propyl acetate of ten diester, and the mass percent of the wetting ability aliphatic isocyanates in the solidifying agent is that the mass percent of 79.6-80%, ten diester alcohol is that the mass percent of 10-10.2%, 1-Methoxy-2-propyl acetate is 10-10.2%.
Modified hydrophilic aminoresin described in the present invention is the part methyl terpolycyantoamino-formaldehyde resin, cooperate to contain-OH ,-COOH and-CONH
2Functional group's resin host, its reactive height and setting rate are fast, can be under no catalyst environment in low-temperature stiffening under warm hardening and the weak acid catalyst.The glossiness of finished product, endurance, stability and hardness are good, are applicable to precoating metal coiled material, baking finish for car and common metal baking varnish coating.
Auxiliary agent described in the present invention is dispersion agent, skimmer, pH regulator agent, wetting agent, flow agent, sudden strain of a muscle rust inhibitor, sanitas, film preservative, film coalescence aid, frostproofer and thickening material.
Described in the present invention for film coalescence aid be one or more compsn of Diethylene Glycol butyl ether, trimethylammonium penta ethanol mono isobutyrate, phenylcarbinol; Described dispersion agent is one or more a compsn of hydrophobicity polycarboxylate, polymer block polymerization body, acrylic polymer; Described in-can preservation agent is the mixture of 2-methyl-4-isothiazoline-3-ketone and 5-chloro-2-methyl-4-isothiazoline-3 ketone; Described film preservative is the mixture of 2-n-octyl-4-isothiazoline-3-ketone and urea derivative; The mixture of one or more that described pH regulator agent is ammoniacal liquor, 2-amino-2-methyl-1-propanol.
Skimmer described in the present invention is a mineral oil defoaming agent; Described wetting agent, flow agent are ZGK 5 one copolyether; Thickening material is one or more combination of water-based attapulgite, aerosil; Film coalescence aid is one or more combination of Diethylene Glycol butyl ether, neopentyl glycol mono isobutyrate; Frostproofer 1-2 glycol; The anti-rust inhibitor that dodges closes zn cpds for Ao; Isocyanic ester is the wetting ability aliphatic isocyanates; Said pigment is one or more combination of titanium oxide or titanium oxide and red iron oxide slurry, yellow oxide of iron slurry, carbon black slurry; Described filler is one or more combinations of permanent white, kaolin, talcum powder, lime carbonate.
The preparation method of the water-based two-pack polyurethane preservative coating described in the present invention, the preparation of I paint vehicle adds earlier entry in material-compound tank, add dispersion agent, skimmer, in-can preservation agent, film preservative, sudden strain of a muscle rust inhibitor, wetting agent, flow agent down in stirring, add the PH regulator again and regulate ph value of mixture to 8.0～9.0; Add filler and pigment again, after thorough mixing is even, with material suction grinding machine for grinding; When slurry fineness≤50 μ m; Add water-based hydroxyl acrylic acid dispersion and modified hydrophilic aminoresin, slowly at the uniform velocity add film coalescence aid and frostproofer again, stirred 10～30 minutes; Add thickening material, filter and obtain paint vehicle; The preparation of II solidifying agent: wetting ability aliphatic isocyanates solidifying agent is added in the material-compound tank, add the pure and mild 1-Methoxy-2-propyl acetate of ten diester, high speed dispersion was crossed and is filtered solidifying agent to evenly in 10～20 minutes.
Beneficial effect: through adopting self-emulsifying hydroxyl acrylic ester dispersion as main film forming substance; Add modified hydrophilic aminoresin; Form two kinds of high molecular polymers and carry out chemical crosslink reaction with hydrophilic aliphatic isocyanates solidifying agent respectively; Two kinds of netted macromolecular structures that high molecular polymer is interweaved of final formation, guaranteeing films has good cross-linking density, has excellent weathering resistance, contamination resistance, water tolerance, chemical proofing thereby give coating.The paint film physical and mechanical properties is good, selects the aliphatic isocyanates and the weather-proof high-grade pigment of water-based pure acrylic acid ester dispersion, 100% solid self-emulsifying for use, has guaranteed guarantor's light, the tint retention of filming.The auxiliary agent of selecting for use in the formulation for coating material all adopts the kind of environmental protection low toxicity until non-toxic type.This water-based two-pack polyurethane preservative coating is two component ambient cure class coating, film have fast drying, gloss from high to low, smooth smooth, the easy construction of paint film, solvent-free smell, characteristics such as safe in utilization, nontoxic.
Embodiment
Constituent and the proportioning (mass percent) thereof of table 1 for adding
Table 1
| The component title | Formula ratio (%) |
| Hydroxyl acrylic aqueous dispersion | 40.0～71.0 |
| Modified resin | 1.0～5.0 |
| Dispersion agent | 0.5～1.2 |
| Skimmer | 0.3～1.0 |
| Wetting agent | 0.1～0.3 |
| Flow agent | 0.1～0.3 |
| Thickening material | 0.5～2.5 |
| Sanitas | 0.1～0.5 |
| The pH regulator agent | 0.5～1.5 |
| Film coalescence aid | 1.5～5.0 |
| Frostproofer | 1.0～3.0 |
| Solidifying agent | 15.0～26.0 |
| Tinting pigment | 2.0～28.0 |
| Filler | 0～10.0 |
| Water | In right amount |
Outer other component that dewaters in the table 1 can be selected proper raw material or various raw material combination according to actual needs, can be one or more mixture of titanium oxide, permanent white, kaolin, lime carbonate like color stuffing; Coatings additive(s) comprises neopentyl glycol mono isobutyrate class film coalescence aid, polymer block copolymerization dispersion agent, thickening material, aerosil, mineral oil defoaming agent and contains the in-can preservation agent and the film preservative of isothiazoline group for another example.
The source of goods situation of some raw material product numbering correspondences that relate among the present invention is as shown in table 2:
Table 2
Table 2 (continuing)
Table 2 (continuing)
Explain through specific embodiment that below shown in following table 3, table 4, but the present invention is not limited to following preferred embodiment
Table 3 paint vehicle (first component)
Table 4 solidifying agent (component B)
| Material name | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| 304/g | 203.0 | 176.0 | 152.0 | 138.0 | 203.0 | 185.0 |
| Ten diester alcohol g | 26.0 | 22.0 | 19.0 | 17.5 | 26.0 | 23.2 |
| Propylene glycol monomethyl ether acetic acid/g | 26.0 | 22.0 | 19.0 | 17.5 | 26.0 | 23.1 |
| Add up to | 255.0 | 220.0 | 190.0 | 173.0 | 255.0 | 231.3 |
Embodiment 1
A. paint vehicle (first component): press listed material name of table 3 and proportioning water 40.5g is added in the material-compound tank; Add dispersion agent 7.0g, skimmer 3.0g, in-can preservation agent 0.5g, film preservative 1.0g down respectively in stirring, dodge rust inhibitor 2.0g, wetting agent 1.0g, flow agent 1.0g; Add PH regulator 2.5g after stirring, after regulation system pH value to 8.0～9.0 scopes, add the import Rutile type Titanium Dioxide; After fully mixing with material suction grinding machine for grinding; When slurry fineness≤50 μ m, add A-145 emulsion 690.0g again, modified resin 20.0g slowly at the uniform velocity adds film coalescence aid 35.0g, frostproofer 3.0g down in stirring, by dope viscosity requirement adding thickening material 12.0g;, product quality indicator, obtains paint vehicle (first component) after the packing after reaching standard-required with 80-100 order silk screen filter.
B. pressing listed material name of table 4 and proportioning adds 304 solidifying agent 203.0g in the material-compound tank; Add ten diester alcohol 26.0g down in stirring; 1-Methoxy-2-propyl acetate 26.0g becomes to disperse 10-20 minute at a high speed to even, after static 10 minutes; With 80-100 order silk screen filter, obtain solidifying agent (component B) construction proportioning after the packing: table 3 paint vehicle (first component) embodiment 1: table 4 solidifying agent (component B) embodiment 1=1000.0: analogize below 255.0.
Embodiment 2-6
Employing and embodiment 1 same method prepare water-based two-pack polyurethane preservative coating first component, component B, and used each title of raw material and the proportioning of embodiment 2-6 seen shown in table 3, the table 4.
Used its solids content of aqueous self-emulsifying acrylate dispersoid of embodiment 1-6 is 45 ± 2% ,-OH percentage composition about 3.3%.
Table 5
Can find out that from table 5 the artificial accelerated aging index of water-based two-pack polyurethane preservative coating of the present invention reaches more than the 1000h, surpass the index request of the artificial 800h of acceleration of the long-acting finish paint of regulation among the industry standard HG/T3656-1999 " steel structure bridge ".Coating paint film traditional performance index reaches the technical requirements of solvent borne polyurethane coating too.Antiseptic property satisfies general requirement; In addition, water-based two-pack polyurethane preservative coating provided by the invention is pressed content (VOC) limit value≤250g/l of the water-based anticorrosive paint volatile organic compounds of regulation among the HJ/T201-2005 " environmental labelling product technical requirements water-borne coatings ".At 100～150g/l, confirm as the green product of environment-friendly type through test VOC content.
Although describe the present invention in conjunction with the preferred embodiments, the present invention is not limited to the foregoing description, should be appreciated that, under the guiding of the present invention's design, those skilled in the art can carry out various modifications and improvement.
Claims (4)
1. water-based two-pack polyurethane preservative coating; Have paint vehicle and solidifying agent two portions; It is characterized in that: it is formulated that paint vehicle consists of water-based hydroxyl acrylic acid dispersion, modified hydrophilic aminoresin, pigment, filler, auxiliary agent and water, and the mass percent of water-based hydroxyl acrylic acid dispersion is that the mass percent of 45-69%, modified resin is that the mass percent of 2-3%, pigment is that the mass percent of 18-26.5%, filler is that the mass percent of 0.1-15%, auxiliary agent is that the mass percent of 7-8.2%, water is 2.8-12.2% in the paint vehicle; Curing agent part is made up of wetting ability aliphatic isocyanates, the pure and mild 1-Methoxy-2-propyl acetate of ten diester, and the mass percent of the wetting ability aliphatic isocyanates in the solidifying agent is that the mass percent of 79.6-80%, ten diester alcohol is that the mass percent of 10-10.2%, 1-Methoxy-2-propyl acetate is 10-10.2%; The quality proportioning of paint vehicle and solidifying agent is 74-85: 15-26 when using.
2. water-based two-pack polyurethane preservative coating as claimed in claim 1 is characterized in that: described modified hydrophilic aminoresin is the part methyl terpolycyantoamino-formaldehyde resin.
3. water-based two-pack polyurethane preservative coating as claimed in claim 1 is characterized in that: described auxiliary agent is dispersion agent, skimmer, pH regulator agent, wetting agent, flow agent, sudden strain of a muscle rust inhibitor, sanitas, film preservative, film coalescence aid, frostproofer and thickening material.
4. like the preparation method of claim 1 or 3 described water-based two-pack polyurethane preservative coatings; It is characterized in that: the preparation of I paint vehicle: in material-compound tank, add earlier entry, add dispersion agent, skimmer, in-can preservation agent, film preservative, sudden strain of a muscle rust inhibitor, wetting agent, flow agent down in stirring, add PH regulator adjusting ph value of mixture to 8.0～9.0 again, add filler and pigment again; After thorough mixing is even; With material suction grinding machine for grinding, when slurry fineness≤50 μ m, add water-based hydroxyl acrylic acid dispersion and modified hydrophilic aminoresin; Slowly at the uniform velocity add film coalescence aid and frostproofer again; Stirred 10～30 minutes, and added thickening material, filter and obtain paint vehicle; The preparation of II solidifying agent: wetting ability aliphatic isocyanates solidifying agent is added in the material-compound tank, add the pure and mild 1-Methoxy-2-propyl acetate of ten diester, high speed dispersion was crossed and is filtered solidifying agent to evenly in 10～20 minutes.
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