CN111548724B - Double-component polyurethane yellowing-resistant high-gloss finish paint for melamine laminated cabinets and preparation method thereof - Google Patents
Double-component polyurethane yellowing-resistant high-gloss finish paint for melamine laminated cabinets 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
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
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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
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2312/00—Crosslinking
Abstract
The invention provides a double-component polyurethane yellowing-resistant high-gloss finish paint for a melamine laminated cabinet and a preparation method thereof, wherein the finish paint comprises a component A and a component B in a weight ratio of 1: 0.6-0.8 percent; the component A consists of the following raw materials in parts by weight: 50-70 parts of high-acid-value fatty acid modified short-oil alkyd resin, 10-20 parts of high-hydroxyl-value fatty acid modified short-oil alkyd resin, 10-20 parts of solvent, 0.01-0.05 part of flatting agent, 0.1-5 parts of defoaming agent and 1-3 parts of auxiliary agent; the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2-0.5; the component B comprises the following raw materials in parts by weight: 70-85 parts of aliphatic polyisocyanate, 10-20 parts of diluent and 0.5-1 part of dehydrating agent. The finish paint has the advantages of good yellowing resistance, high gloss, good adhesiveness, low price and environmental protection, and is particularly suitable for popular melamine laminated cabinets.
Description
Technical Field
The invention relates to the technical field of finish paint for melamine laminated cabinets, in particular to double-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinets and a preparation method thereof.
Background
The melamine veneer cupboard is popular with people because of low price and wear resistance. The melamine laminated cabinet is mainly made of melamine boards, and the melamine boards are artificial boards formed by impregnating special laminated paper with melamine resin, drying and curing the melamine resin, paving the melamine resin on the surfaces of shaving boards, medium-density fiberboards or hard fiberboards and the like, and carrying out hot pressing on the surfaces of the shaving boards, the medium-density fiberboards or the hard fiberboards. Because melamine is an inert material, and a release agent is added in the manufacturing process of the melamine board, the traditional polyurethane coating is difficult to coat on the surface of the melamine board, and the paint film has poor adhesion and poor adherence.
Moreover, in order to improve the grade of the existing melamine laminated cabinet, the finish paint needs to have high hardness, yellowing resistance, high gloss and gloss retention. In addition, kitchen humidity is high, and the use environment is not good, so the top paint for the cupboard is usually solvent type paint with good water resistance, such as a woodenware paint which is combined by hydroxyl acrylic resin and synthetic fatty acid modified short oil alkyd resin and a preparation method thereof disclosed in CN 201510397724.9. However, the short oil alkyd resin in the wood coating needs to be dissolved by toluene, xylene or a mixed xylene/ester solvent, which is not environment-friendly; the woodware coating added with acrylic resin can improve the yellowing resistance, but the polyacrylate coating is expensive and is unacceptable in the existing market, so that the woodware coating is not suitable for being used as a popular cabinet finish.
Disclosure of Invention
In order to solve the problems, the invention provides the two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet, and the finish paint has the advantages of good yellowing resistance, high gloss, good adhesion, low price and environmental protection.
The invention also provides a preparation method of the double-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet.
The invention discloses a double-component polyurethane yellowing-resistant high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.6-0.8 percent;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2-0.5;
wherein the component B comprises the following raw materials in parts by weight:
70-85 parts of aliphatic polyisocyanate
10-20 parts of diluent
0.5-1 part of dehydrating agent.
Preferably, the two-component polyurethane anti-yellowing high-gloss finish paint for the melamine laminated cabinet comprises a component A and a component B in a weight ratio of 1: 0.6 mixing;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.35 by mixing;
wherein the component B comprises the following raw materials in parts by weight:
75 parts of aliphatic polyisocyanate
15 portions of diluent
0.6 part of dehydrating agent.
Preferably, the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Preferably, the defoaming agent is polyether modified polysiloxane and/or vinyl ether modified acrylate copolymer.
Further preferably, the defoaming agent is prepared by mixing polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.2-0.5 by weight percent. The polyether modified polysiloxane mainly plays a role in defoaming and foam inhibition, the vinyl ether modified acrylate copolymer mainly plays a role in defoaming, and the two are used in a matched manner, so that the phenomena of shrinkage cavities, pinholes, orange peels, microbubbles and the like on the surface of a paint film are avoided, and the smooth and bright finish paint can be obtained.
Preferably, the leveling agent is one or more of polyether modified polysiloxane, polyester modified polysiloxane, polyacrylate and fluorine modified polyacrylate.
Preferably, the auxiliary agent is one or more of a dispersant, an anti-settling agent and an ultraviolet absorber.
Wherein the dispersant is a dispersant commonly used in paint production, such as polyethylene glycol and polyvinylpyrrolidone.
The anti-settling agent is an anti-settling agent commonly used in coating production, such as polyolefin wax and polyamide wax.
The ultraviolet absorbent is an ultraviolet absorbent commonly used in paint production, such as UV-511.
Preferably, the aliphatic polyisocyanate is hexamethylene diisocyanate trimer.
Preferably, the diluent is one or more of butyl acetate, propylene glycol methyl ether acetate and propylene glycol methyl ether propionate; the dehydrating agent is BF-5 dehydrating agent.
The invention also discloses a preparation method of the double-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet, which comprises the following steps:
step one, adding the high-acid-value fatty acid modified short-oil alkyd resin, the high-hydroxyl-value fatty acid modified short-oil alkyd resin and a part of solvent into a container, and uniformly stirring to obtain mixed resin;
step two, adding the flatting agent and the defoaming agent into the mixed resin obtained in the step one in a dropwise manner, continuing stirring, adding the auxiliary agent and the residual solvent, and uniformly mixing to obtain a component A;
step three, uniformly mixing the aliphatic polyisocyanate, the diluent and the dehydrating agent to obtain a component B;
and step four, uniformly mixing the component A in the step two with the component B curing agent in the step three before coating, thus obtaining the coating.
Compared with the prior art, the invention has the following beneficial effects:
in the double-component polyurethane anti-yellowing high-gloss finish paint, the component A and the component B are mixed according to the weight ratio of 1: 0.6 to 0.8, and crosslinking and curing the hydroxyl in the component A and the isocyanate group in the component B to form a paint film. Among them, aliphatic polyisocyanates have good yellowing resistance, while aromatic polyisocyanates have poor yellowing resistance, but aliphatic polyisocyanates have poor reactivity as compared with aromatic polyisocyanates. Based on the method, 10 to 20 parts of high hydroxyl value fatty acid modified short oil alkyd resin and 50 to 70 parts of high acid value fatty acid modified short oil alkyd resin are mixed, wherein, the high hydroxyl value fatty acid modified short oil alkyd resin provides high content of hydroxyl, can improve the crosslinking curing rate of the alkyd resin and isocyanate group, and the high acid value fatty acid modified short oil alkyd resin can improve the leveling performance of the single high hydroxyl value fatty acid modified short oil alkyd resin and also can provide high-content carboxyl, the catalyst has good catalysis effect on crosslinking and curing, the catalyst and the solvent have synergistic effect, the solvent with a specific component proportion (namely the solvent formed by mixing propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2-0.5) is matched, and a leveling agent, a defoaming agent and an auxiliary agent are added to obtain a stable component A; and the component B with a specific weight ratio is matched, so that the low crosslinking curing rate caused by low reactivity of the aliphatic polyisocyanate can be avoided, the crosslinking density of a paint film can be improved, a bright, compact, high-gloss and anti-yellowing finish paint is formed, the finish paint has high hardness, excellent adhesiveness, water resistance, gloss retention and stain resistance, and the solvent of the finish paint does not contain toluene, xylene and the like, so that the finish paint is more environment-friendly. Moreover, the finish paint does not contain expensive polyacrylate resin, is more easily accepted by the current markets, and is particularly suitable for popular melamine laminated cabinet finish paints.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
Example 1
The embodiment provides a two-component polyurethane anti-yellowing high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.6-0.8 percent;
the component A comprises the following raw materials in parts by weight:
wherein the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2-0.5;
wherein the component B comprises the following raw materials in parts by weight:
70-85 parts of aliphatic polyisocyanate
10-20 parts of diluent
0.5-1 part of dehydrating agent.
Wherein the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Wherein the defoaming agent is polyether modified polysiloxane and/or vinyl ether modified acrylate copolymer. Specifically, the defoaming agent is prepared from polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.2-0.5 by weight percent.
Wherein, the flatting agent is one or more of polyether modified polysiloxane, polyester modified polysiloxane, polyacrylate and fluorine modified polyacrylate.
Wherein the auxiliary agent is one or more of a dispersing agent, an anti-settling agent and an ultraviolet absorbent.
Wherein the aliphatic polyisocyanate is hexamethylene diisocyanate trimer.
Wherein the diluent is one or more of butyl acetate, propylene glycol methyl ether acetate and propylene glycol methyl ether propionate.
Wherein the dehydrating agent is BF-5 dehydrating agent.
The preparation method of the double-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet comprises the following steps:
step one, adding high-acid-value fatty acid modified short-oil alkyd resin, high-hydroxyl-value fatty acid modified short-oil alkyd resin and two-third solvent into a container, and uniformly stirring to obtain mixed resin;
step two, adding the flatting agent and the defoaming agent into the mixed resin obtained in the step one in a dropwise manner, continuing stirring, adding the auxiliary agent and the remaining one third of the solvent, and uniformly mixing to obtain a component A;
step three, evenly mixing aliphatic polyisocyanate, a diluent and a dehydrating agent to obtain a component B;
and step four, uniformly mixing the component A in the step two with the component B curing agent in the step three before coating, thus obtaining the coating.
Example 2
The embodiment provides a two-component polyurethane anti-yellowing high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.6 mixing;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.35 by mixing;
wherein the component B comprises the following raw materials in parts by weight:
75 parts of hexamethylene diisocyanate trimer
15 portions of diluent
0.6 part of BF-5 dehydrating agent.
Wherein the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Wherein the defoaming agent is prepared from polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.5, and mixing.
Wherein, the leveling agent consists of 0.02 part of polyether modified polysiloxane and 0.01 part of fluorine modified polyacrylate.
Wherein the auxiliary agent consists of 1 part of UV-511 ultraviolet absorbent and 0.5 part of polyolefin wax anti-settling agent.
Wherein the diluent consists of 8 parts of butyl acetate, 5 parts of propylene glycol methyl ether acetate and 2 parts of propylene glycol methyl ether propionate.
The preparation method of the two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet in the embodiment is basically the same as that of the embodiment 1.
Example 3
The embodiment provides a two-component polyurethane anti-yellowing high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.8, mixing;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2 mixing;
wherein the component B comprises the following raw materials in parts by weight:
hexamethylene diisocyanate trimer 70 parts
12 portions of diluent
0.5 part of BF-5 dehydrating agent.
Wherein the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Wherein the defoaming agent is prepared from polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.3, and mixing.
Wherein, the flatting agent is 0.01 part of polyether modified polysiloxane.
Wherein the auxiliary agent consists of 1.5 parts of UV-511 ultraviolet absorbent and 0.5 part of polyolefin wax anti-settling agent.
Wherein the diluent consists of 7 parts of propylene glycol methyl ether acetate and 5 parts of propylene glycol methyl ether propionate.
The preparation method of the two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet in the embodiment is basically the same as that of the embodiment 1.
Example 4
The embodiment provides a two-component polyurethane anti-yellowing high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.7 mixing;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.3, mixing;
wherein the component B comprises the following raw materials in parts by weight:
hexamethylene diisocyanate trimer 70 parts
10 portions of diluent
0.5 part of BF-5 dehydrating agent.
Wherein the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Wherein the defoaming agent is prepared from polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.2, and mixing.
Wherein, the flatting agent consists of 0.01 part of polyether modified polysiloxane and 0.01 part of polyacrylate.
Wherein the auxiliary agent consists of 0.2 part of polyethylene glycol dispersant, 2.3 parts of UV-511 ultraviolet absorbent and 0.5 part of polyolefin wax anti-settling agent.
Wherein the diluent consists of 6 parts of butyl acetate and 4 parts of propylene glycol methyl ether propionate.
The preparation method of the two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet in the embodiment is basically the same as that of the embodiment 1.
Example 5
The embodiment provides a two-component polyurethane anti-yellowing high-gloss finish paint for a melamine laminated cabinet, which is prepared from a component A and a component B in a weight ratio of 1: 0.6 mixing;
the component A comprises the following raw materials in parts by weight:
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.5 mixing;
wherein the component B comprises the following raw materials in parts by weight:
85 parts of hexamethylene diisocyanate trimer
20 portions of diluent
1 part of BF-5 dehydrating agent.
Wherein the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g; the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
Wherein the defoaming agent is prepared from polyether modified polysiloxane and vinyl ether modified acrylate copolymer according to the weight ratio of 1: 0.5, and mixing.
Wherein the leveling agent consists of 0.03 part of polyester modified polysiloxane and 0.02 part of fluorine modified polyacrylate.
Wherein the auxiliary agent consists of 0.1 part of polyethylene glycol dispersant, 0.5 part of UV-511 ultraviolet absorbent and 0.4 part of polyolefin wax anti-settling agent.
Wherein the diluent consists of 10 parts of butyl acetate, 5 parts of propylene glycol methyl ether acetate and 5 parts of propylene glycol methyl ether propionate.
The preparation method of the two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet in the embodiment is basically the same as that of the embodiment 1.
Comparative example 1
The two-component polyurethane finish paint and the preparation method thereof provided by the comparative example are basically the same as those of the example 2, and the differences are only that: the two-component polyurethane finish paint of the comparative example is prepared from a component A and a component B in a weight ratio of 1: 1 are mixed.
Comparative example 2
The two-component polyurethane finish paint and the preparation method thereof provided by the comparative example are basically the same as those of the example 2, and the differences are only that: the two-component polyurethane finish paint of the comparative example is prepared from a component A and a component B in a weight ratio of 1: 0.3, and mixing.
Comparative example 3
The two-component polyurethane finish paint and the preparation method thereof provided by the comparative example are basically the same as those of the example 2, and the differences are only that: in the double-component polyurethane finish paint of the comparative example, the component A only contains the high-hydroxyl-value fatty acid modified short-oil alkyd resin, but does not contain the high-acid-value fatty acid modified short-oil alkyd resin.
Comparative example 4
The two-component polyurethane finish paint and the preparation method thereof provided by the comparative example are basically the same as those of the example 2, and the differences are only that: in the double-component polyurethane finish paint of the comparative example, the solvent of the component A only comprises propylene glycol methyl ether acetate and butyl acetate according to the weight ratio of 1: 0.5, and no polymethoxy dimethyl ether.
And (3) performance testing:
the finish paint obtained in examples 2-5 and the finish paint obtained in comparative examples 1-4 are subjected to performance tests, wherein the basic performance test of the finish paint refers to GB/23997-. The results of the performance testing of the topcoats obtained in examples 2-5 are shown in Table 1. The results of the performance testing of the topcoats obtained in example 2, as well as comparative examples 1-4, are shown in Table 2.
TABLE 1
As can be seen from Table 1, the hardness of the finish paint in examples 2-5 is H, the glossiness is up to more than 90, the yellowing resistance is good, the adhesion is 0 grade, the water resistance, the stain resistance and the like meet the requirements of national standards, and the comprehensive performance is good. The top coat of example 2, among others, had the best overall properties.
TABLE 2
As can be seen from Table 2, the overall performance of the topcoat of comparative example 3 is much lower than that of the topcoat of example 2, and the overall performance of the topcoats of comparative examples 1-4, such as gloss, hardness, adhesion, water resistance, yellowing resistance, etc., are all inferior to that of the topcoat of example 2.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the true scope of the embodiments of the invention.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. The two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinet is characterized by comprising a component A and a component B in a weight ratio of 1: 0.6-0.8 percent;
the component A comprises the following raw materials in parts by weight:
50-70 parts of high-acid-value fatty acid modified short-oil alkyd resin
10-20 parts of high-hydroxyl-value fatty acid modified short-oil alkyd resin
10-20 parts of solvent
0.01-0.05 part of flatting agent
0.1 to 5 portions of defoaming agent
1-3 parts of an auxiliary agent;
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.2-0.5;
wherein the component B comprises the following raw materials in parts by weight:
70-85 parts of aliphatic polyisocyanate
10-20 parts of diluent
0.5-1 part of dehydrating agent;
the solid content of the high-acid-value fatty acid modified short-oil alkyd resin is 70%, the acid value is 18mg KOH/g, and the hydroxyl value is 120mg KOH/g;
the solid content of the high hydroxyl value fatty acid modified short oil alkyd resin is 80%, the acid value is 12mg KOH/g, and the hydroxyl value is 150mg KOH/g.
2. The two-component polyurethane yellowing-resistant high-gloss finish paint for the melamine laminated cabinets, as claimed in claim 1, is prepared from a component A and a component B in a weight ratio of 1: 0.6 mixing;
the component A comprises the following raw materials in parts by weight:
63 parts of high-acid-value fatty acid modified short-oil alkyd resin
16 parts of high-hydroxyl-value fatty acid modified short-oil alkyd resin
18 portions of solvent
0.03 part of flatting agent
Defoaming agent 3 parts
1.5 parts of an auxiliary agent;
the solvent is prepared from propylene glycol methyl ether acetate, butyl acetate and polymethoxy dimethyl ether according to the weight ratio of 1: 0.5: 0.35 by mixing;
wherein the component B comprises the following raw materials in parts by weight:
75 parts of aliphatic polyisocyanate
15 portions of diluent
0.6 part of dehydrating agent.
3. The two-component polyurethane yellowing-resistant high-gloss topcoat for melamine-skinned cabinets of claim 1, wherein the defoamer is polyether-modified polysiloxane and/or vinyl ether-modified acrylate copolymer.
4. The two-component polyurethane yellowing-resistant high-gloss topcoat for melamine-skinned cabinets of claim 3, wherein the defoamer is prepared from polyether-modified polysiloxane and vinyl ether-modified acrylate copolymer in a weight ratio of 1: 0.2-0.5 by weight percent.
5. The two-component polyurethane anti-yellowing high-gloss finish paint for the melamine laminated cabinets, as claimed in claim 1, wherein the leveling agent is one or more of polyether modified polysiloxane, polyester modified polysiloxane, polyacrylate and fluorine modified polyacrylate.
6. The two-component polyurethane yellowing-resistant high-gloss topcoat for melamine-skinned cabinets of claim 1, wherein the auxiliary agent is one or more of a dispersant, an anti-settling agent, and an ultraviolet absorber.
7. The two-component polyurethane yellowing-resistant high-gloss topcoat for melamine-skinned cabinets of claim 1, wherein the aliphatic polyisocyanate is hexamethylene diisocyanate trimer.
8. The two-component polyurethane anti-yellowing high-gloss topcoat for melamine-skinned cabinets of claim 1,
the diluent is one or more of butyl acetate, propylene glycol methyl ether acetate and propylene glycol methyl ether propionate;
the dehydrating agent is BF-5 dehydrating agent.
9. The preparation method of the two-component polyurethane anti-yellowing high-gloss finish paint for the melamine laminated cabinet as claimed in any one of claims 1 to 8, is characterized by comprising the following steps:
step one, adding the high-acid-value fatty acid modified short-oil alkyd resin, the high-hydroxyl-value fatty acid modified short-oil alkyd resin and a part of solvent into a container, and uniformly stirring to obtain mixed resin;
step two, adding the flatting agent and the defoaming agent into the mixed resin obtained in the step one in a dropwise manner, continuing stirring, adding the auxiliary agent and the residual solvent, and uniformly mixing to obtain a component A;
step three, uniformly mixing the aliphatic polyisocyanate, the diluent and the dehydrating agent to obtain a component B;
and step four, uniformly mixing the component A in the step two with the component B curing agent in the step three before coating, thus obtaining the coating.
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| CN114149738A (en) * | 2021-11-12 | 2022-03-08 | 鹤山市君子兰涂料有限公司 | Polyurethane primer applied to melamine board |
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