CN111471387A - Water-based woodenware coating and using method thereof - Google Patents
Water-based woodenware coating and using method thereof Download PDFInfo
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- CN111471387A CN111471387A CN202010323980.4A CN202010323980A CN111471387A CN 111471387 A CN111471387 A CN 111471387A CN 202010323980 A CN202010323980 A CN 202010323980A CN 111471387 A CN111471387 A CN 111471387A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
- C09D5/1687—Use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
- B05D2502/005—Acrylic polymers modified
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
Abstract
The invention belongs to the technical field of coatings, and particularly relates to a water-based wood coating which comprises a component A and a component B; the component A comprises the following raw materials by the total mass of 100 percent: 50-60% of water-based hydroxyl acrylic resin, 20-30% of modified hydroxyl acrylic resin, 2-3% of acrylic microspheres, 2-5% of wax emulsion, 0.2-0.4% of defoaming agent, 0.4-0.5% of wetting agent, 2-3% of film-forming assistant, 0.3-0.6% of thickening agent, 0.2-0.3% of flatting agent and the balance of water; the component B comprises the following raw material components in percentage by mass: 70-80% of water-based isocyanate and 20-30% of cosolvent. The water-based wood coating disclosed by the invention has the characteristics of good water resistance, strong stain resistance, strong scratch resistance and the like through the combined action of the raw material components, and is good in stability of combination with wood, green and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based wood coating and a using method thereof.
Background
With the enhancement of the environmental awareness of people and the continuous improvement of environmental regulations, in the wood ware coating market, the water-based wood ware coating is more and more favored by furniture manufacturers and consumers due to the excellent low VOC and the protection performance to wood in the furniture market. Compared with solvent-based wood coatings, the water-based wood coating has the advantages of environmental protection, energy conservation, safety, reliability, convenient use and the like, so the development of the water-based wood coating is very popular in recent years, but the water-based wood coating in the current market generally has the defects of poor water resistance, particularly poor boiling water resistance, poor stain resistance, poor scratch resistance and the like. However, for office furniture, kitchen and bathroom furniture and the like with higher requirements on the physical and chemical properties of the surface of the coating, the performance of the existing water-based wood coating cannot meet the market requirements easily. Therefore, the method has important industrial significance for improving the surface physical and chemical properties of the waterborne wood finish.
Disclosure of Invention
The invention aims to provide a water-based wood coating, and aims to solve the technical problem that the existing water-based wood coating is poor in water resistance, stain resistance, scratch resistance and the like.
The invention also aims to provide a using method of the water-based wood coating.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
an aqueous woodenware coating comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
70 to 80 percent of water-based isocyanate,
20 to 30 percent of cosolvent.
Preferably, the mass ratio of the component A to the component B is (4-6): 1.
preferably, the solid content of the water-based hydroxy acrylic resin is 44-48%, the hydroxyl content is 3.5-4.5%, and the acid value is not higher than 10 mg/g.
Preferably, the modified hydroxy acrylic resin is an organosiloxane modified hydroxy acrylic resin.
Preferably, the solid content of the modified hydroxy acrylic resin is 40-42%, the hydroxyl content is 1.5-2%, and the acid value is not higher than 30 mg/g.
Preferably, the aqueous isocyanate is selected from: hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate.
Preferably, the aqueous isocyanate has an NCO content of 20.7% to 21.7%.
Preferably, the wax emulsion is selected from: at least one of polypropylene wax, polyethylene wax and fluorine-modified polyethylene wax.
Preferably, the wax emulsion has a softening point of 130 ℃ to 150 ℃.
Preferably, the acrylic microspheres are selected from: polymethyl methacrylate microspheres; the average particle size of the acrylic microspheres is 4-7 microns.
Preferably, the antifoaming agent is selected from: at least one of a water-based silicone defoamer and a mineral oil defoamer.
Preferably, the wetting agent is selected from: at least one of polyether modified siloxane, organosilicon gemini structure and alkynediol.
Preferably, the coalescent is selected from: at least one of dipropylene glycol butyl ether and dipropylene glycol methyl ether.
Preferably, the thickening agent is selected from: associative polyurethane thickeners.
Preferably, the leveling agent is selected from: a polyether siloxane copolymer.
Preferably, the co-solvent is selected from: propylene glycol methyl ether acetate.
Correspondingly, the application method of the water-based wood coating comprises the following steps:
obtaining a slurry of the component A;
obtaining the slurry of the component B;
mixing the slurry of the component A and the slurry of the component B to obtain the water-based wood coating;
depositing the aqueous wood coating on wood.
Preferably, the step of mixing process comprises: and (3) mixing the slurry of the component A and the slurry of the component B according to a mass ratio of (4-6): 1, mixing to obtain the waterborne wood coating.
Preferably, the step of depositing the aqueous wood coating on wood comprises: the aqueous wood coating is deposited on the surface of wood within 4 hours.
Preferably, the step of obtaining the slurry of the a-component comprises:
after the aqueous hydroxyl acrylic resin and the modified hydroxyl acrylic resin with the formula amount are obtained, mixing to obtain a first mixed slurry;
adding the defoaming agent, the wetting agent and the acrylic microspheres in a formula ratio into the first mixed slurry, and mixing to obtain a second mixed slurry;
and adding the film forming assistant and water in the formula amount into the second mixed slurry, adding the leveling agent and the wax emulsion in the formula amount, and mixing to obtain the slurry of the component A.
Preferably, the step of obtaining the slurry of the B-fraction comprises: and mixing the aqueous isocyanate and the cosolvent according to the formula ratio to obtain the slurry of the component B.
The invention provides a waterborne wood coating which comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 50-60% of water-based hydroxyl acrylic resin, 20-30% of modified hydroxyl acrylic resin, 2-3% of acrylic microspheres, 2-5% of wax emulsion, 0.2-0.4% of defoaming agent, 0.4-0.5% of wetting agent, 2-3% of film-forming assistant, 0.3-0.6% of thickening agent, 0.2-0.3% of flatting agent and the balance of water; the component B comprises the following raw material components in percentage by mass: 70-80% of water-based isocyanate and 20-30% of cosolvent. The water-based wood coating provided by the invention has the advantages that 50-60% of water-based hydroxyl acrylic resin enables the coating to have better chemical resistance and water resistance. The modified hydroxyl acrylic resin with the content of 20-30% not only effectively improves the stain resistance, chemical resistance and scratch resistance of the wood coating, but also obviously improves the resistance to boiling water at 100 ℃; if the content of the modified hydroxyacrylic acid is too high, the transparency of the paint film may be deteriorated, which is disadvantageous for the application of the paint. Wherein, 2 to 3 percent of acrylic microspheres and 2 to 5 percent of wax emulsion can further improve the scratch resistance effect of the wood coating. In addition, the components such as the defoaming agent, the wetting agent, the film forming agent, the thickening agent, the flatting agent and the like enable the woodware coating slurry to have good stability, strong adhesive force with woodware and good film forming performance, and a formed paint film is flat, uniform in thickness and good in stability. The woodenware coating disclosed by the invention has the characteristics that a paint film formed by the aqueous woodenware coating has good water resistance, strong stain resistance, strong scratch resistance and the like through the combined action of the raw material components with specific percentage contents in the component A and the component B, and the woodenware coating is good in combination stability with woodenware and is green and environment-friendly.
The application method of the waterborne wood coating provided by the invention comprises the following steps of firstly, respectively obtaining slurry of the component A and slurry of the component B; then mixing the slurry of the component A and the slurry of the component B to obtain the waterborne wood coating; and then depositing the water-based wood coating on the wood to form a uniform paint film on the surface of the wood. The application method is simple to operate, flexible in application and suitable for industrial large-scale production and application.
Detailed Description
In order to make the purpose, technical solution and technical effect of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
The embodiment of the invention provides a water-based woodware coating, which comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
70 to 80 percent of water-based isocyanate,
20 to 30 percent of cosolvent.
The water-based wood coating provided by the embodiment of the invention comprises a component A and a component B, wherein the component A comprises the following raw material components in percentage by mass: 50-60% of water-based hydroxyl acrylic resin, 20-30% of modified hydroxyl acrylic resin, 2-3% of acrylic microspheres, 2-5% of wax emulsion, 0.2-0.4% of defoaming agent, 0.4-0.5% of wetting agent, 2-3% of film-forming assistant, 0.3-0.6% of thickening agent, 0.2-0.3% of flatting agent and the balance of water; the component B comprises the following raw material components in percentage by mass: 70-80% of water-based isocyanate and 20-30% of cosolvent. According to the water-based wood coating provided by the embodiment of the invention, 50-60% of water-based hydroxyl acrylic resin enables the coating to have better chemical resistance and water resistance. The modified hydroxyl acrylic resin with the content of 20-30% not only effectively improves the stain resistance, chemical resistance and scratch resistance of the wood coating, but also obviously improves the resistance to boiling water at 100 ℃; if the content of the modified hydroxyacrylic acid is too high, the transparency of the paint film may be deteriorated, which is disadvantageous for the application of the paint. Wherein, 2 to 3 percent of acrylic microspheres and 2 to 5 percent of wax emulsion can further improve the scratch resistance effect of the wood coating. In addition, the components such as the defoaming agent, the wetting agent, the film forming agent, the thickening agent, the flatting agent and the like enable the woodware coating slurry to have good stability, strong adhesive force with woodware and good film forming performance, and a formed paint film is flat, uniform in thickness and good in stability. The woodware coating provided by the embodiment of the invention has the characteristics of good water resistance, strong stain resistance, strong scratch resistance and the like through the combined action of the raw material components with specific percentage contents in the component A and the component B, and the woodware coating has good bonding stability with woodware and is green and environment-friendly.
In some embodiments, the mass ratio of the A component to the B component is (4-6): 1. the aqueous woodenware coating provided by the embodiment of the invention is characterized in that the A component and the B component are stored separately before use, and when the aqueous woodenware coating needs to be used, the A component and the B component are mixed according to the mass ratio of (4-6): 1, depositing on a woodware by coating, spraying and other modes after being uniformly mixed, and forming a paint film through the crosslinking curing reaction among A, B components. If the content of the component B is too high, the crosslinking density in the coating is too high, so that the flexibility of a coating film of the coating is reduced after the coating film is dried, and the adhesion of the coating film on a woodware is poor; if the content of the component B is too low, the crosslinking density of the components in the paint is low, the drying is slow, the film-forming property is poor, and the overall performance of a paint film is influenced.
In some embodiments, the aqueous hydroxy acrylic resin has a solid content of 44-48%, a hydroxyl content of 3.5-4.5%, and an acid value of 8-12 mg/g. The solid content of the aqueous hydroxyl acrylic resin in the component A of the aqueous woodware coating disclosed by the embodiment of the invention is 44-48%, the hydroxyl content is 3.5-4.5%, and the acid value is not higher than 10 mg/g; has higher solid content, and ensures that the paint film formed after the paint is dried has good fullness. Meanwhile, the hydroxyl content is higher, so that the coating is more favorable for cross-linking and film forming among components in the application process, the fullness of a paint film is further improved, and the chemical resistance and the scratch resistance of the paint film are improved. In addition, the acid value of the water-based hydroxy acrylic resin is not higher than 10mg/g, and the water-based hydroxy acrylic resin has a lower acid value, so that the cross-linking and curing of the resin are facilitated, the stability of the film forming of the coating is further improved, and the performances of chemical resistance, scratch resistance, water resistance and the like of a paint film are improved.
In some embodiments, the modified hydroxyacrylic resin is an organosiloxane modified hydroxyacrylic resin. According to the wood coating disclosed by the embodiment of the invention, the component A is added with the hydroxyl acrylic resin modified by the organic siloxane, the organic siloxane has a unique chemical structure and lower surface energy, the film forming process tends to surface aggregation, and the organic silicon resin has the characteristics of good water resistance, chemical resistance, scratch resistance and the like.
In some embodiments, the modified hydroxyacrylic resin has a solids content of 40% to 42%, a hydroxyl content of 1.5% to 2%, and an acid value of not higher than 30 mg/g. The modified hydroxy acrylic resin with the solid content of 40-42 percent, the hydroxyl content of 1.5-2 percent and the acid value not higher than 30mg/g can further improve the fullness of a paint film and simultaneously improve the chemical resistance and the scratch resistance of the paint film.
In some embodiments, the modified hydroxyacrylic resin is an organosiloxane-modified hydroxyacrylic resin; the solid content of the modified hydroxy acrylic resin is 40-42%, the hydroxyl content is 1.5-2%, and the acid value is not higher than 30 mg/g.
In some embodiments, the wax emulsion is selected from: at least one of polypropylene wax, polyethylene wax and fluorine-modified polyethylene wax. In some embodiments, the wax emulsion has a softening point of 130 ℃ to 150 ℃. At least one wax emulsion of polypropylene wax, polyethylene wax and fluorine modified polyethylene wax added in the component A of the wood coating provided by the embodiment of the invention has a softening point of 130-150 ℃, and has a higher softening point, so that the scratch resistance effect of a paint film of the wood coating can be further improved, and the paint film has good temperature resistance and good stability.
In some embodiments, the acrylic microspheres are selected from: polymethyl methacrylate microspheres; the average particle size of the acrylic microspheres is 4-7 microns. The acrylic microspheres added into the component A of the wood coating disclosed by the embodiment of the invention have extinction capability, and the permeability and the scratch resistance of a paint film are improved. Further, the average particle size of the acrylic microspheres is 4-7 microns, and if the particle size of the acrylic microspheres is too small, the extinction force is poor; if the particle diameter is too large, the surface of the paint film becomes rough.
In some embodiments, the antifoaming agent is selected from: at least one of a water-based silicone defoamer and a mineral oil defoamer. The component A of the waterborne wood coating provided by the embodiment of the invention also comprises 0.2-0.4% of at least one defoaming agent selected from a waterborne organic silicon defoaming agent and a mineral oil defoaming agent, and the defoaming agents can well inhibit and eliminate the generation of foam in the coating, improve the film forming performance of the slurry, and enable a dried paint film to be free of air holes and to be uniform and stable. If the content of the defoaming agent is too low, the effect of inhibiting and eliminating the foam in the slurry is not obvious, and if the content of the defoaming agent is too high, the content of other functional components in the coating is reduced, and the paint film performance of the coating is reduced.
In some embodiments, the wetting agent is selected from: at least one of polyether modified siloxane, organosilicon gemini structure and alkynediol. In the component A of the waterborne wood coating disclosed by the embodiment of the invention, 0.4-0.5% of a small amount of at least one wetting agent of polyether modified siloxane, organic silicon gemini structures and alkynediols is added, and the wetting agents can reduce the surface tension of the coating and improve the deposition film-forming effect of the coating on wood. If the content of the wetting agent is too high, the water resistance of the paint film is poor, the waterproof effect of the paint film is not facilitated, and the protection performance on woodware is poor.
In some embodiments, the coalescent is selected from: at least one of dipropylene glycol butyl ether and dipropylene glycol methyl ether. The component A of the waterborne wood coating disclosed by the embodiment of the invention is added with 2-3% of at least one film-forming aid of dipropylene glycol butyl ether and dipropylene glycol methyl ether, so that the plastic flowability and elastic deformation of the coating can be promoted, the film-forming of the coating is more facilitated, and the film-forming aid can be volatilized after the film-forming of the coating, so that the performance of a paint film is not influenced.
In some embodiments, the thickening agent is selected from: associative polyurethane thickeners. 0.3% -0.6% of associative polyurethane thickener added in the component A of the waterborne wood coating in the embodiment of the invention is a hydrophobic group modified ethoxy polyurethane water-soluble polymer, belongs to nonionic associative thickener, can improve the viscosity of the coating, enables the wood coating to keep uniform and stable suspension state or emulsion state or form gel, and is beneficial to coating and deposition of the coating on the surface of wood.
In some embodiments, the leveling agent is selected from: a polyether siloxane copolymer. The component A of the waterborne wood coating disclosed by the embodiment of the invention is also added with 0.2-0.3% of polyether siloxane copolymer flatting agent, so that the surface tension of the coating can be effectively reduced, the flatting property and uniformity of the coating are improved, and the coating is promoted to form a flat, smooth and uniform coating film in a drying film-forming process. Meanwhile, the permeability of the coating liquid can be improved, the possibility of generating spots and stains when the coating is deposited is reduced, the coverage is increased, and the film is formed uniformly and naturally.
In some embodiments, the aqueous isocyanate is selected from: hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate. In some embodiments, the aqueous isocyanate has an NCO content of 20.7% to 21.7%. In the component B of the embodiment of the invention, 70-80% of water-based isocyanate is selected from: the hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate has better crosslinking and curing effects with components such as resin in the component A. Furthermore, the NCO content of the water-based isocyanate is 20.7-21.7%, the water-based isocyanate with high NCO content has better crosslinking and curing effects, so that the coating is quickly dried after being formed into a film, and meanwhile, the addition amount of the B component curing agent in the slurry is reduced, so that a paint film has higher chemical resistance, water resistance, scratch resistance and other properties.
In some embodiments, the co-solvent is selected from: propylene glycol methyl ether acetate has better dissolving and dispersing effects on the water-based isocyanate in the component B, so that the slurry of the component B has good stability, and when the propylene glycol methyl ether acetate is mixed with the component A for use, the A, B component is favorably and uniformly mixed to generate a crosslinking curing reaction, and a stable paint film is formed.
Correspondingly, the embodiment of the invention also provides a using method of the water-based wood coating, which comprises the following steps:
s10, obtaining the slurry of the component A;
s20, obtaining the slurry of the component B;
s30, mixing the slurry of the component A and the slurry of the component B to obtain the water-based wood coating;
s40, depositing the water-based wood coating on a wood ware.
The application method of the water-based wood coating provided by the embodiment of the invention comprises the following steps of firstly, respectively obtaining slurry of the component A and slurry of the component B; then mixing the slurry of the component A and the slurry of the component B to obtain the waterborne wood coating; and then the waterborne wood coating is deposited on the wood, and a paint film with the characteristics of uniform film formation, good weather resistance, chemical resistance, water resistance, temperature resistance, scratch resistance and the like can be formed on the surface of the wood. The application method of the water-based wood coating disclosed by the embodiment of the invention is simple to operate, flexible in application and suitable for industrial large-scale production and application.
Specifically, in step S10, the step of obtaining the slurry of the component a includes:
s11, obtaining the water-based hydroxyl acrylic resin and the modified hydroxyl acrylic resin in a formula amount, and mixing to obtain a first mixed slurry;
s12, adding the defoaming agent, the wetting agent and the acrylic microspheres in a formula ratio into the first mixed slurry, and mixing to obtain a second mixed slurry;
s13, adding the film forming aid and the water in the formula amount into the second mixed slurry, adding the leveling agent and the wax emulsion in the formula amount, and mixing to obtain the slurry of the component A.
The method comprises the following steps of obtaining slurry of the component A, firstly, stirring the aqueous hydroxyl acrylic resin and the modified hydroxyl acrylic resin in a formula amount for 3-5 min at a rotating speed of 300-400 rpm, and uniformly mixing; then adding the defoaming agent, the wetting agent and the acrylic microspheres in a formula amount, and stirring at the rotating speed of 1000-1200 rpm for 10-15 min; then adding the film forming assistant and water, the flatting agent and the wax emulsion according to the formula amount, stirring at the rotating speed of 600-800 rpm for 5-15 min, and uniformly mixing to obtain the slurry of the component A. The preparation step is beneficial to uniformly mixing all the components in the slurry of the component A to form a uniform and stable slurry system, and the problems of nonuniform mixing of the components in the slurry, poor stability of the slurry and the like are avoided.
Specifically, in step S20, the step of obtaining the slurry of the B component includes: and stirring the water-based isocyanate and the cosolvent for 5-15 min at the rotating speed of 200-300 rpm according to the formula ratio, and uniformly mixing to obtain the slurry of the component B.
Specifically, in step S30, the aqueous wood coating is obtained after mixing the slurry of the component a and the slurry of the component B. In some embodiments, the mass ratio of the slurry of the component A to the slurry of the component B is (4-6): 1, mixing to obtain the waterborne wood coating. According to the embodiment of the invention, the slurry of the component A and the slurry of the component B are mixed according to the mass ratio of (4-6): 1, uniformly mixing to obtain the water-based wood coating. The mixed paint can be directly coated and deposited on the surface of woodware, and a stable paint film is formed by crosslinking and curing A, B components.
Specifically, in step S40, the aqueous wood coating is deposited on wood. In some embodiments, the step of depositing the aqueous wood coating on wood comprises: the aqueous wood coating is deposited on the surface of wood within 4 hours. According to the embodiment of the invention, A, B components are mixed to obtain the water-based wood coating, the coating is deposited on the surface of the wood within 4 hours, and if A, B components of the mixed wood coating are placed for a long time, the components in the slurry can generate a crosslinking curing reaction, so that the wood slurry can not be coated and deposited any more. In a more preferred embodiment, A, B is mixed to obtain the waterborne wood coating, and then the waterborne wood coating is deposited on the surface of wood to form a paint film.
In order to make the above implementation details and operations of the present invention clearly understood by those skilled in the art and make the advanced performance of the waterborne wood coating of the embodiments of the present invention obviously manifest, the above technical solution is exemplified by a plurality of embodiments.
Example 1
An aqueous woodenware coating comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
80 percent of water-based isocyanate,
20 percent of cosolvent.
Example 2
An aqueous woodenware coating comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
70 percent of water-based isocyanate,
30 percent of cosolvent.
Example 3
An aqueous woodenware coating comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
75 percent of water-based isocyanate,
25% of cosolvent.
Comparative example 1
An aqueous woodenware coating comprises a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
80 percent of water-based isocyanate,
20 percent of cosolvent.
Further, in order to verify the advancement of the aqueous wood coatings prepared in the embodiments 1 to 3 and the comparative example 1 of the present invention, the paint films of the aqueous wood coatings of the embodiments 1 to 3 and the comparative example 1 are subjected to resistance tests such as water resistance, boiling water resistance, alkali resistance and the like, and the hardness and scratch resistance are tested, and the test results are shown in the following table 1:
TABLE 1
The test results show that the paint film of the water-based wood paint disclosed in the embodiments 1-3 has better tolerance, hardness and scratch resistance compared with the paint film of the paint disclosed in the comparative example 1, and each physical and chemical property completely meets the standard of GB/T23999-2009 water-based wood paint for interior decoration and finishing, and also meets the standard for pollution resistance test of ANSI KCMAA 161.1.1-2012 of North American kitchen ware manufacturers, so that the paint film is an excellent high-performance water-based wood paint.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The water-based wood coating is characterized by comprising a component A and a component B; the composition comprises the following raw material components in percentage by mass of 100 percent of the component A:
the component B comprises the following raw material components in percentage by mass of 100 percent:
70 to 80 percent of water-based isocyanate,
20 to 30 percent of cosolvent.
2. The aqueous woodenware coating as claimed in claim 1, wherein the mass ratio of the component A to the component B is (4-6): 1.
3. the aqueous woodenware coating as claimed in claim 1 or 2, wherein the solid content of the aqueous hydroxyl acrylic resin is 44% -48%, the hydroxyl content is 3.5-4.5%, and the acid value is not higher than 10 mg/g.
4. The aqueous wood coating according to claim 3, wherein the modified hydroxy acrylic resin is an organosiloxane modified hydroxy acrylic resin; and/or the presence of a gas in the gas,
the solid content of the modified hydroxy acrylic resin is 40-42%, the hydroxyl content is 1.5-2%, and the acid value is not higher than 30 mg/g.
5. The aqueous wood coating of any one of claims 1, 2 or 4, wherein the aqueous isocyanate is selected from the group consisting of: hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate; and/or the presence of a gas in the gas,
the NCO content of the water-based isocyanate is 20.7-21.7%.
6. The aqueous wood coating of claim 5, wherein the wax emulsion is selected from the group consisting of: at least one of polypropylene wax, polyethylene wax, fluorine-modified polyethylene wax; and/or the presence of a gas in the gas,
the softening point of the wax emulsion is 130-150 ℃.
7. The aqueous wood coating of any one of claims 1, 2, 4 or 6, wherein the acrylic microspheres are selected from the group consisting of: polymethyl methacrylate microspheres; the average particle size of the acrylic microspheres is 4-7 microns; and/or the presence of a gas in the gas,
the defoaming agent is selected from: at least one of a water-based silicone defoamer and a mineral oil defoamer; and/or the presence of a gas in the gas,
the wetting agent is selected from: at least one of polyether modified siloxane, organic silicon gemini structure and alkynediol; and/or the presence of a gas in the gas,
the film-forming aid is selected from: at least one of dipropylene glycol butyl ether and dipropylene glycol methyl ether; and/or the presence of a gas in the gas,
the thickening agent is selected from: associative polyurethane thickeners; and/or the presence of a gas in the gas,
the leveling agent is selected from: a polyether siloxane copolymer; and/or the presence of a gas in the gas,
the cosolvent is selected from: propylene glycol methyl ether acetate.
8. The use method of the water-based wood coating as claimed in any one of claims 1 to 7, comprising the following steps:
obtaining a slurry of the component A;
obtaining the slurry of the component B;
mixing the slurry of the component A and the slurry of the component B to obtain the water-based wood coating;
depositing the aqueous wood coating on wood.
9. The method of using the aqueous wood coating according to claim 8, wherein the mixing process comprises: and (3) mixing the slurry of the component A and the slurry of the component B according to a mass ratio of (4-6): 1, mixing to obtain the water-based wood coating; and/or the presence of a gas in the gas,
the step of depositing the aqueous wood coating on wood comprises: the aqueous wood coating is deposited on the surface of wood within 4 hours.
10. The method of using the aqueous wood coating according to claim 8 or 9, wherein the step of obtaining the slurry of the a component comprises:
after the aqueous hydroxyl acrylic resin and the modified hydroxyl acrylic resin with the formula amount are obtained, mixing to obtain a first mixed slurry;
adding the defoaming agent, the wetting agent and the acrylic microspheres in a formula ratio into the first mixed slurry, and mixing to obtain a second mixed slurry;
adding the film forming assistant and water in the formula amount into the second mixed slurry, adding the leveling agent and the wax emulsion in the formula amount, and mixing to obtain slurry of the component A; and/or the presence of a gas in the gas,
the step of obtaining the slurry of the B component comprises: and mixing the aqueous isocyanate and the cosolvent according to the formula ratio to obtain the slurry of the component B.
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