CN113150648A - Aqueous bi-component thick-coatable ultralow-VOC high-solid clear primer and preparation method thereof - Google Patents
Aqueous bi-component thick-coatable ultralow-VOC high-solid clear primer and preparation method thereof Download PDFInfo
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- CN113150648A CN113150648A CN202110423127.4A CN202110423127A CN113150648A CN 113150648 A CN113150648 A CN 113150648A CN 202110423127 A CN202110423127 A CN 202110423127A CN 113150648 A CN113150648 A CN 113150648A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/44—Amides
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
Abstract
The invention discloses a water-based double-component thick-coating ultralow VOC high-solid clear primer and a preparation method thereof, wherein the primer comprises a main paint and a curing agent, and the main paint comprises the following components in percentage by mass: 55-70% of liquid epoxy resin, 0.2-0.4% of dispersant, 0.5-1% of anti-settling agent, 0.2-0.4% of defoaming agent, 0.2-0.4% of wetting and leveling agent, 15-25% of filler, 8-12% of active diluent and 3-8% of cosolvent; the high-solid clear primer disclosed by the invention has the advantages of high solid content, very high crosslinking density, relatively compact and smooth formed film, high hardness, excellent transparency and filling property, excellent sinking resistance, and especially has the advantage of no bubble in thick coating, the coating times of the primer can be reduced, the VOC (volatile organic compound) emission in the coating process is obviously reduced, the coating labor cost is saved, and the working efficiency of furniture enterprises is greatly improved.
Description
Technical Field
The invention relates to paint, in particular to aqueous bi-component thick-coatable ultralow VOC (volatile organic compound) high-solid clear primer and a preparation method thereof.
Background
The water-based wood coating has the advantages of health and environmental protection because water is used as a solvent, and is more and more popular in the market, but the water-based transparent primer has low solid content and poor filling property, and is easy to have the problem of bubbles when being thickly coated, particularly the defects of hidden bubbles, pinholes, miliaria and the like are easy to appear in the drying process of the water-based double-component polyurethane transparent primer, the requirement can be met only by adopting the measures of coating for many times, the construction period is long, the coating production efficiency is low, the coating is easy to collapse, the coating effect is seriously influenced, the requirements of users on high coating efficiency, high effect and more harsh quality can not be met, the coating requirement of high-decoration furniture can not be met, the problem which always puzzles the coating industry is one, and the application of the water-based transparent primer in the field of furniture coating is seriously limited.
Disclosure of Invention
The invention aims to provide a water-based double-component thick-coatable ultralow VOC high-solid clear primer and a preparation method thereof, the clear primer has high solid content and high crosslinking density, a formed coating film is relatively compact and smooth, the hardness is high, the transparency and the filling property are excellent, the sinking resistance is excellent, the coating defects of the conventional water-based transparent primer such as easy occurrence of dark bubbles, pinholes, miliaria and the like are thoroughly overcome, the thick coating can be realized, the coating number of the primer is reduced, the integral coating efficiency is greatly improved, and the VOC emission is obviously reduced, so that the problems in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
the water-based bi-component thick-coating ultralow-VOC high-solid clear primer comprises a main paint and a curing agent, wherein the main paint comprises the following components in percentage by mass: 55-70% of liquid epoxy resin, 0.2-0.4% of dispersant, 0.5-1% of anti-settling agent, 0.2-0.4% of defoaming agent, 0.2-0.4% of wetting and leveling agent, 15-25% of filler, 8-12% of active diluent and 3-8% of cosolvent; the mass ratio of the main paint to the curing agent is 1: 0.4.
Furthermore, the high-solid clear primer takes water as a diluent, and the content of the added water is 1: 0.4: 0.5-1 by mass ratio of the main paint, the curing agent and the water.
Furthermore, the liquid epoxy resin is DER331 of DOW company, the epoxy equivalent is 182-192g/Eq, the solid content is 100 percent, the fullness and the transparency of the coating film can be obviously improved, the low viscosity and the high epoxy equivalent are easy to be emulsified by the curing agent and react with the curing agent to form a compact and smooth coating film with high crosslinking density and mechanical strength, and the sag resistance is excellent.
Furthermore, the dispersing agent is a high molecular weight block copolymer dispersing agent containing pigment affinity groups, so that the dispersing time of the filler in an epoxy coating system can be obviously shortened, the long-term stability of the filler in the system is ensured, flocculation and sedimentation are prevented, the viscosity of the system is reduced, and the leveling of a coating film after construction is promoted.
Furthermore, the anti-settling agent is organic bentonite, has excellent anti-settling effect, improves the construction performance of the coating, ensures that the coating obtains better anti-sagging property, and can be thickly coated into a film. The filler is talcum powder and zinc stearate which have synergistic effect, and the filling property and the sanding property of the primer are effectively improved.
Furthermore, the reactive diluent is a hydrophilic reactive diluent C12-C14 alkyl glycidyl ether, so that the viscosity of the system is obviously reduced, the emulsified liquid epoxy resin is helped to enable the coating system to be more stable, the flowing property is improved, the wetting of the coating to the surface of a substrate and the penetration of the coating into the substrate are improved, the air in the substrate is quickly replaced, the foaming is avoided, the flexibility of the system can be greatly improved, the cracking of a thick coating film is prevented, meanwhile, an epoxy group is carried by the coating to participate in a crosslinking curing reaction, the fullness and compactness of the coating film are further improved, the sinking prevention performance is improved, and particularly, the VOC of the system can be reduced.
Furthermore, the cosolvent is formed by mixing propylene glycol methyl ether and ethanol according to the mass ratio of 4:6, so that emulsification and film formation are facilitated, wherein the propylene glycol methyl ether has small pollution to the environment and high safety, the ethanol belongs to a reproducible nontoxic solvent, and a solvent system has low toxicity and cannot pollute the environment.
Furthermore, the curing agent is self-emulsified modified polyamide, the amine value is 180-220mgKOH/g, the solid content is 100%, the curing agent is both a cross-linking agent and an emulsifying agent, has good water dispersibility, has good emulsification effect on epoxy resin to form a stable emulsion system, has a long pot life and can be rapidly cured to form a film, and particularly, the curing agent contains a long flexible molecular chain, so that the coating film has good flexibility and crack resistance.
The invention provides another technical scheme, which comprises a preparation method of a water-based double-component thick-coating ultralow VOC high-solid clear primer, and the preparation method comprises the following steps:
(A) preparation of the Main Lacquer
Weighing the following raw materials, by mass, 55-70% of liquid epoxy resin, 0.2-0.4% of dispersing agent, 0.5-1% of anti-settling agent, 0.2-0.4% of defoaming agent, 0.2-0.4% of wetting and leveling agent, 15-25% of filler, 8-12% of active diluent and 3-8% of cosolvent;
b, adding the liquid epoxy resin, the reactive diluent and part of cosolvent into a container, and dispersing for 5 minutes at the speed of 600-800 revolutions per minute; then dispersing while adding a dispersing agent, an anti-settling agent and a filler at the speed of 600 plus 800 revolutions per minute, and dispersing for 20 minutes at the speed of 1200 plus 1500 revolutions per minute until the fineness is qualified;
c, adding the rest cosolvent and the auxiliary agent, and dispersing for 10 minutes at the speed of 600 plus 800 rpm to obtain a main paint component;
(B) the paint comprises the following main paint in percentage by mass: curing agent 1: 0.4, uniformly mixing the main paint and the curing agent, adding water as a diluent, and mixing the main paint and the curing agent according to the mass ratio: curing agent: water 1: 0.4: uniformly mixing the components in a ratio of 0.5-1; spraying or brushing on the surface of the woodware, and naturally drying or baking and drying at low temperature.
Compared with the prior art, the invention has the beneficial effects that:
1 the waterborne two-component thickly-coated ultralow VOC high-solid clear primer prepared by the experiment selects a modified polyamide curing agent which is a cross-linking agent and an emulsifying agent, has good compatibility with liquid epoxy resin, can form a stable coating system with small latex particle size, narrow distribution range and good permeability, has longer pot life, excellent construction performance and very high cross-linking density to be cured into a macromolecular reticular structure, ensures that a coating film is relatively compact, firm, high in hardness and good in sag resistance, particularly has strong-polarity ether bonds and hydroxyl groups in an epoxy resin molecular structure, has excellent adhesive force to wood, thereby obviously improving the sealing effect of the primer, can prevent tannic acid and grease in the wood from exudation due to the reaction with the tannic acid in the wood to form a stable chelate, and eliminates the swelling and bleeding phenomena caused by the temperature change in the later period of the coating film, can meet the coating requirements of furniture of different products.
2 because the adopted epoxy resin and the modified polyamide curing agent are both 100 percent of solid content, the prepared clear primer has very high solid content and ultralow VOC, the transparency and fullness of the clear primer are greatly improved, and the sinking of the finish paint is prevented.
3 no by-product of gas is generated in the process of curing reaction of the clear primer, thereby thoroughly solving the problems of hidden bubbles, pinholes, miliaria and the like which are easy to generate in the process of thick coating of the double-component transparent primer, being capable of thick coating construction, reducing the coating times, improving the coating production efficiency and reducing the VOC emission.
4 the whole system of the clear primer does not adopt an emulsifier, eliminates the influence of the emulsifier on a coating film, thoroughly solves the problem of water sensitivity of the conventional water-based paint, improves the defoaming performance of the system, ensures the compactness of the coating film, and has excellent water resistance and adhesive force.
5 the clear primer exists in a solvent type coating state, has good preparation process operability, simple production method, no need of special equipment, no wastewater discharge in the production process, waste discharge treatment cost saving, suitability for large-scale production, no problems of poor freeze-thaw stability and storage stability of the conventional water-based coating, and excellent storage stability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
Example 1
Preparing main paint; weighing 100kg of the following components in percentage by mass: 56kg of liquid epoxy resin, 0.4kg of dispersing agent, 1kg of anti-settling agent, 0.2kg of defoaming agent, 0.2kg of wetting and leveling agent, 25kg of filler, 10kg of active diluent and 7.2kg of cosolvent; adding liquid epoxy resin, active diluent and part of cosolvent into a container, and dispersing for 5 minutes at the speed of 600-800 rpm; then dispersing while adding a dispersing agent, an anti-settling agent and a filler at the speed of 600 plus 800 revolutions per minute, and dispersing for 20 minutes at the speed of 1200 plus 1500 revolutions per minute until the fineness is qualified; adding the rest cosolvent and the auxiliary agent, and dispersing for 10 minutes at the speed of 600-800 rpm to obtain the main paint component.
Coating; fully stirring and uniformly mixing the main paint and the curing agent, then adding water, and mixing according to the mass ratio of the main paint, the curing agent and the water of 1: 0.4: 0.5-1; after being mixed evenly, the mixture is sprayed or brushed on the surface of woodware, and the woodware is naturally dried or baked and dried at low temperature, and the construction effective period is 4 hours.
Example 2
Preparing main paint; weighing 100kg of the following components in percentage by mass: 63kg of liquid epoxy resin, 0.3kg of dispersing agent, 0.8kg of anti-settling agent, 0.3kg of defoaming agent, 0.3kg of wetting leveling agent, 20kg of filler, 11kg of active diluent and 4.3kg of cosolvent; adding liquid epoxy resin, active diluent and part of cosolvent into a container, and dispersing for 5 minutes at the speed of 600-800 rpm; then dispersing while adding a dispersing agent, an anti-settling agent and a filler at the speed of 600 plus 800 revolutions per minute, and dispersing for 20 minutes at the speed of 1200 plus 1500 revolutions per minute until the fineness is qualified; adding the rest cosolvent and the auxiliary agent, and dispersing for 10 minutes at the speed of 600-800 rpm to obtain the main paint component.
Coating; fully stirring and uniformly mixing the main paint and the curing agent, and then adding water, wherein the main paint, the curing agent and the water are mixed according to the mass ratio of 1: 0.4: 0.5-1; after being mixed evenly, the mixture is sprayed or brushed on the surface of woodware, and the woodware is naturally dried or baked and dried at low temperature, and the construction effective period is 4 hours.
Example 3
Preparing main paint; weighing 100kg of the following components in percentage by mass: 70kg of liquid epoxy resin, 0.2kg of dispersing agent, 0.5kg of anti-settling agent, 0.3kg of defoaming agent, 0.4kg of wetting and leveling agent, 15kg of filler, 10kg of active diluent and 3.6kg of cosolvent; adding liquid epoxy resin, active diluent and part of cosolvent into a container, and dispersing for 5 minutes at the speed of 600-800 rpm; then dispersing while adding a dispersing agent, an anti-settling agent and a filler at the speed of 600 plus 800 revolutions per minute, and dispersing for 20 minutes at the speed of 1200 plus 1500 revolutions per minute until the fineness is qualified; adding the rest cosolvent and the auxiliary agent, and dispersing for 10 minutes at the speed of 600-800 rpm to obtain the main paint component.
Coating; fully stirring and uniformly mixing the main paint and the curing agent, and then adding water, wherein the main paint, the curing agent and the water are mixed according to the mass ratio of 1: 0.4: 0.5-1; after being mixed evenly, the mixture is sprayed or brushed on the surface of woodware, and the woodware is naturally dried or baked and dried at low temperature, and the construction effective period is 4 hours.
The performance comparison of the aqueous two-component thickly-coatable ultralow-VOC high-solid clear primer of the invention with the commercially available aqueous two-component polyurethane transparent primer and the solvent type polyurethane transparent primer shows that the results are shown in the following table:
as can be seen from the data in the table above: the prepared water-based double-component thick-coatable ultralow-VOC high-solid clear primer has obviously better performance than the water-based double-component polyurethane transparent primer and solvent type polyurethane woodware transparent primer on the market, can thoroughly solve the coating defects of easy hidden bubbles, pinholes, miliaria and the like of the conventional transparent primer, can be thick-coated into a film, has good filling property and good sinking resistance, simultaneously has ultralow VOC, obviously reduces VOC emission in the coating process, belongs to a green environment-friendly coating, provides a very good environment-friendly solution for furniture enterprises, meets the production requirements of energy conservation, environmental protection and high efficiency, and also accords with the government environment-friendly policy.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (9)
1. The water-based double-component thick-coating ultralow-VOC high-solid clear primer is characterized by comprising a main paint and a curing agent, wherein the main paint comprises the following components in percentage by mass: 55-70% of liquid epoxy resin, 0.2-0.4% of dispersant, 0.5-1% of anti-settling agent, 0.2-0.4% of defoaming agent, 0.2-0.4% of wetting and leveling agent, 15-25% of filler, 8-12% of active diluent and 3-8% of cosolvent; the mass ratio of the main paint to the curing agent is 1: 0.4.
2. The aqueous two-component thickly coatable ultralow VOC high solid clear primer according to claim 1, wherein the high solid clear primer uses water as a diluent, and the mass ratio of the added water is 1: 0.4: 0.5-1.
3. The aqueous two-component thickly coatable, ultra low VOC high solids primer of claim 1 wherein the liquid epoxy resin is DER331, epoxy equivalent 182 and 192g/Eq from DOW with 100% solids.
4. The aqueous two-component thickly coatable ultra-low VOC high solids clear primer according to claim 1, wherein the dispersant is a high molecular weight block copolymer dispersant containing pigment affinity groups, the defoamer is a polyether modified polysiloxane defoamer, and the wetting leveling agent is a fluorine modified polyacrylic leveling agent.
5. The aqueous two-component thickly coatable ultra-low VOC high solids clear primer according to claim 1 wherein the anti-settling agent is an organobentonite and the filler is zinc stearate and talc.
6. The aqueous two-component thickly coatable ultralow VOC high solids clearcoat of claim 1 wherein the reactive diluent is a hydrophilic reactive diluent C12-C14 alkyl glycidyl ether.
7. The aqueous two-component thickly coatable ultralow VOC high solids clear primer according to claim 1, wherein the cosolvent is propylene glycol methyl ether and ethanol mixed at a mass ratio of 4: 6.
8. The aqueous two-component thickly coatable ultralow VOC high solids primer according to claim 1 wherein the curing agent is a self-emulsifying modified polyamide with an amine value of 180-220mgKOH/g and a solids content of 100%.
9. The method of preparing the aqueous two-component thickly coatable ultra low VOC high solids clear primer according to claim 1 comprising the steps of:
(A) preparation of the Main Lacquer
Weighing the following raw materials, by mass, 55-70% of liquid epoxy resin, 0.2-0.4% of dispersing agent, 0.5-1% of anti-settling agent, 0.2-0.4% of defoaming agent, 0.2-0.4% of wetting and leveling agent, 15-25% of filler, 8-12% of active diluent and 3-8% of cosolvent;
b, adding the liquid epoxy resin, the reactive diluent and part of cosolvent into a container, and dispersing for 5 minutes at the speed of 600-800 revolutions per minute; then dispersing while adding a dispersing agent, an anti-settling agent and a filler at the speed of 600 plus 800 revolutions per minute, and dispersing for 20 minutes at the speed of 1200 plus 1500 revolutions per minute until the fineness is qualified;
c, adding the rest cosolvent and the auxiliary agent, and dispersing for 10 minutes at the speed of 600 plus 800 rpm to obtain a main paint component;
(B) the paint comprises the following main paint in percentage by mass: curing agent 1: 0.4, uniformly mixing the main paint and the curing agent, adding water as a diluent, and mixing the main paint and the curing agent according to the mass ratio: curing agent: water 1: 0.4: uniformly mixing the components in a ratio of 0.5-1; spraying or brushing on the surface of the woodware, and naturally drying or baking and drying at low temperature.
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| CN202110423127.4A CN113150648A (en) | 2021-04-20 | 2021-04-20 | Aqueous bi-component thick-coatable ultralow-VOC high-solid clear primer and preparation method thereof |
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| US20160280843A1 (en) * | 2013-11-07 | 2016-09-29 | Allnex Austria Gmbh | Cationic alkyd resins |
| CN105505124A (en) * | 2016-01-15 | 2016-04-20 | 成都优品化工有限公司 | Water-dilutability epoxy woodware transparent primer and preparing method thereof |
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| CN115612374A (en) * | 2022-11-01 | 2023-01-17 | 中远关西涂料（上海）有限公司 | Preparation method of ultrahigh-solid epoxy paint for special box |
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