CN113234378A - Multilayer water-based paint and spraying method - Google Patents
Multilayer water-based paint and spraying method Download PDFInfo
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- CN113234378A CN113234378A CN202110589358.2A CN202110589358A CN113234378A CN 113234378 A CN113234378 A CN 113234378A CN 202110589358 A CN202110589358 A CN 202110589358A CN 113234378 A CN113234378 A CN 113234378A
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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
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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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- 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
-
- 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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- 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
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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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- 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
- B05D2503/00—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
- B05D2504/00—Epoxy polymers
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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
- B05D2505/00—Polyamides
Abstract
The invention discloses a multilayer water-based paint and a spraying method, wherein the multilayer water-based paint comprises a primer, a middle paint and a finish paint; the primer A component takes water-based epoxy resin as main body resin, the B component takes water-based polyamide resin as main body resin, and the two components carry out chemical reaction on the surface of a workpiece to form a primer layer; the intermediate coat takes water-based polyurethane as main body resin and is used for spraying and adhering to the primer layer to form a connecting layer; the finish paint C component takes water-based hydroxyl polyurethane as main resin, the finish paint D component takes water-based isocyanate as main resin, and the two components are subjected to chemical reaction on the connecting layer to form a protective layer. In the system, the primer has better adhesive force to metal materials and plastic materials, and the intermediate coat has better interlayer binding force; the finish paint increases the smoothness, wear resistance and elasticity of the surface, and the drying temperature can be controlled to be not more than 80 ℃ in the whole spraying process and is below the temperature which can be borne by plastic materials.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a multilayer water-based coating and a spraying method.
Background
Some existing product structural members are composed of plastic members and metal members, specifically, metal materials are used as main bodies, and plastic materials are used for making complex shapes, such as notebook computer shells, home appliances and automobile interior decoration. The structure can improve the production efficiency of the material and reduce the production cost.
The existing production process comprises the steps of firstly respectively carrying out injection molding on a metal material and a plastic material, then respectively spraying and coloring a plastic piece and a metal piece, and finally assembling the sprayed plastic piece and the sprayed metal piece into a whole. If the plastic part and the metal part are assembled firstly and then uniformly sprayed and colored, the difficulty also exists because the baking temperature of the existing metal part for spraying paint is usually 140-160 ℃, which is higher than the temperature which can be born by the plastic part; furthermore, the adhesion force of the general plastic part spray paint to the metal part is poor, and the salt spray resistance test is difficult to pass for more than 500 hours.
Disclosure of Invention
The technical problem to be solved by the invention is that the existing coating has poor adhesion force when being applied to a plastic-metal assembly or the drying temperature exceeds the temperature which can be born by plastic.
In order to solve the technical problems, the invention provides a multilayer water-based paint which comprises a primer, a middle paint and a finish;
the primer comprises a component A and a component B; the component A takes water-based epoxy resin as main body resin, the component B takes water-based polyamide resin as main body resin, the two components are mixed and sprayed on the surface of a workpiece, and a chemical reaction is carried out on the surface of the workpiece to form a primer layer;
the intermediate paint takes water-based polyurethane as main body resin and is used for spraying and adhering to the primer layer to form a connecting layer;
the finish paint comprises a component C and a component D; the component C takes water-based hydroxyl polyurethane as main resin, the component D takes water-based isocyanate as main resin, the two components are mixed and sprayed on the connecting layer, and chemical reaction is carried out on the connecting layer to form a protective layer.
Further, in the primer, the component A comprises the following components in percentage by weight: 80-86% of water-based epoxy resin, 2-3% of adhesion promoter, 4-6.5% of film-forming assistant and 5-14% of deionized water;
the component B comprises the following components in percentage by weight: 40-60% of water-based polyamide resin, 0.5-0.8% of thickening agent, 1-2% of anti-settling agent, 0.4-0.6% of wetting agent, 15-35% of pigment, 1-4% of dispersing agent, 0.4-0.6% of defoaming agent, 0.5-1% of flatting agent and 20-35% of deionized water.
Further, the Chinese lacquer comprises the following components in percentage by weight: 35-50% of waterborne polyurethane, 0.1-0.2% of pH regulator, 4-6% of thickening agent, and anti-settling agent: 0.5-1%, 7-25% of pigment, 1-4% of dispersing agent, 10-15% of film-forming assistant, 0.1-0.3% of flatting agent, 0.5-1% of defoaming agent and 20-35% of deionized water.
Further, in the finish paint, the component C comprises the following components in percentage by weight: 70-80% of water-based hydroxyl polyurethane, 0.1-0.2% of defoaming agent, 4-6% of film-forming additive, 0.4-0.6% of wetting agent, 0.4-0.6% of flatting agent, 0.5-1% of thickening agent, 6-8% of organic matte powder and 5-15% of deionized water;
the component D comprises the following components in percentage by weight: 70-80% of water-based isocyanate and 20-30% of film-forming assistant.
Further, according to the weight percentage, in the primer, the component A comprises: 82% of waterborne epoxy resin, 2% of adhesion promoter, 6% of film-forming assistant and 10% of deionized water;
the component B comprises: 45% of water-based polyamide resin, 0.8% of thickening agent, 1.1% of anti-settling agent, 0.4% of wetting agent, 16% of pigment, 3.7% of dispersing agent, 0.5% of defoaming agent, 0.5% of flatting agent and 32% of deionized water;
the middle paint comprises: 42% of waterborne polyurethane, 0.2% of pH regulator, 4.2% of thickener, and anti-settling agent: 0.5 percent of pigment, 8 percent of dispersing agent, 3.7 percent of film-forming additive, 10 percent of flatting agent, 0.2 percent of defoaming agent and 30.4 percent of deionized water;
in the finish paint, the component C comprises: 78% of water-based hydroxyl polyurethane, 0.2% of defoaming agent, 5% of film-forming assistant, 0.6% of wetting agent, 0.5% of flatting agent, 0.8% of thickening agent, 6.8% of organic matte powder and 8.1% of deionized water;
the component D comprises: 80% of water-based isocyanate and 20% of film-forming assistant.
Further, the aqueous epoxy resin contains 10 or more secondary hydroxyl groups.
A spray coating method based on the multi-layer aqueous coating material as described above, comprising:
step A, mixing and diluting the component A and the component B by using deionized water, spraying the mixture on the surface of a workpiece, and drying to obtain a primer layer;
step B, diluting the intermediate coat by using deionized water, spraying the diluted intermediate coat on the primer layer, and drying to obtain a connecting layer;
and step C, mixing and diluting the component C and the component D by using deionized water, spraying the mixture on the intermediate paint layer, drying to obtain a protective layer, and finishing spraying.
Further, in the step A, the dilution ratio is as follows: the component A comprises: and B component: deionized water 10: 10: (1-2), the drying conditions are as follows: baking at 60-80 deg.C for 40-60 min.
Further, in the step B, the dilution ratio is: and (3) intermediate coating: deionized water 10: (1-3) the drying conditions are as follows: baking at 60-80 deg.C for 20-40 min.
Further, in the step C, the dilution ratio is: and C, component C: and (D) component: deionized water 10: 1: (1-2) drying conditions are as follows: baking at 60-80 deg.C for 180-240 min.
The embodiment of the invention has the following beneficial effects: the multilayer water-based paint comprises a primer, a middle paint and a finish, wherein the primer has good adhesive force to metal materials and plastic materials, has strong covering power, can cover connecting seams of plastics and hardware, and is easy to polish and rework; the intermediate paint has better interlayer bonding force, can be compatible with pigment to produce required color, and can also show metal effect; the finish paint forms a protective layer with a certain thickness on the surface of the intermediate paint, so that the smoothness, the wear resistance and the elasticity of the surface are increased, the hand feeling is smooth, and the back adhesion and the yellowing are avoided after long-term use; in the whole spraying process, the drying temperature can be controlled to be not more than 80 ℃ and below the temperature which can be borne by plastic materials.
The multilayer water-based paint disclosed by the invention has the advantages that the organic solvent content in the formula of each layer of paint is extremely low, and a large amount of deionized water is used as a construction diluent, so that the paint is extremely low in taste and environment-friendly; in addition, the primer, the intermediate paint and the finish paint are all water-based paints, so that the alternate construction of the oil-based paint and the water-based paint on the same construction site is avoided, and the cross contamination of the oil-based paint and the water-based paint is avoided.
Detailed Description
The invention provides a multilayer water-based paint, which specifically comprises a primer, a middle paint and a finish paint. The primer is two components, including component A and component B. Wherein, A component uses waterborne epoxy resin as the main part resin, B component uses waterborne polyamide resin as the main part resin, during the use, mix two components earlier, then the spraying is on the work piece surface, waterborne epoxy resin and waterborne polyamide resin are assisted the adhesion promoter and can take place chain reaction under lower temperature, the solidification forms the priming paint layer, this priming paint layer all has better adhesive force to plastic material and metal material, and have better acid and alkali resistance, boiling water resistance, salt fog resistance, and the covering power is strong, can cover plastics and five metals joint line, easily polish, easy rework. Aqueous epoxy resins having a high epoxy equivalent and containing 10 or more secondary hydroxyl groups are preferable, and rapid progress of the reaction is more facilitated; the intermediate coat takes waterborne polyurethane as main body resin and is used for spraying and attaching on the primer layer to form a connecting layer, pigment can be compounded according to color requirements, the pigment can be dispersed in the waterborne polyurethane to produce the required color, and meanwhile, the waterborne polyurethane has good compatibility and interlayer adhesion to the primer and the finish and has a metal effect; the finish paint comprises a component C and a component D; the water-based hydroxyl polyurethane is used as main body resin for the component C, the water-based isocyanate is used as main body resin for the component D, the two components are mixed firstly during use and then sprayed on the intermediate paint connecting layer, the water-based hydroxyl polyurethane and the water-based isocyanate can react at a lower temperature to generate the water-based polyurethane, the finish paint forms a protective layer with a certain thickness on the connecting layer, the surface smoothness, the wear resistance and the elasticity of the protective layer are simultaneously improved, the hand feeling is smooth, and the anti-sticky performance and the anti-yellowing performance are realized after long-term use. In addition, the primer, the intermediate paint and the finish paint are all water-based paints, the content of organic solvents in the paint formulas of all layers is extremely low, a large amount of deionized water is used as a construction diluent, the taste is extremely low, the environment is friendly, and the oil-based paint and the water-based paint are prevented from being alternately constructed on the same construction site and the cross contamination of the oil-based paint and the water-based paint is avoided.
In one embodiment, the primer A comprises the following components in percentage by weight: 80-86% of water-based epoxy resin, 2-3% of adhesion promoter, 4-6.5% of film-forming assistant and 5-11% of deionized water; the component B comprises: 40-60% of water-based polyamide resin, 0.5-0.8% of thickening agent, 1-2% of anti-settling agent, 0.4-0.6% of wetting agent, 15-35% of pigment, 1-4% of dispersing agent, 0.4-0.6% of defoaming agent, 0.5-1% of flatting agent and 20-35% of deionized water.
In one embodiment, the Chinese lacquer comprises, by weight: 35-50% of waterborne polyurethane, 0.1-0.2% of pH regulator, 4-6% of thickening agent, and anti-settling agent: 0.5-1%, 7-25% of pigment, 1-4% of dispersing agent, 10-15% of film-forming assistant, 0.1-0.3% of flatting agent, 0.5-1% of defoaming agent and 20-35% of deionized water. In the embodiment, the deionized water can be matched according to a certain mass percentage, can be used for adjusting various colors, and has the advantages of good compatibility with pigments, strong metal texture, good surface effect, quick drying, strong interlayer adhesion and good water boiling resistance.
In one embodiment, the C component in the finish paint comprises the following components in percentage by weight: 70-80% of water-based hydroxyl polyurethane, 0.1-0.2% of defoaming agent, 4-6% of film-forming additive, 0.4-0.6% of wetting agent, 0.4-0.6% of flatting agent, 0.5-1% of thickening agent, 6-8% of organic matte powder and 5-15% of deionized water; the component D comprises: 70-80% of water-based isocyanate and 20-30% of film-forming assistant. The finish paint has good scratch resistance, fine and smooth surface, smoothness and elasticity, no after tack after long-term use, no yellowing, higher wear resistance and elasticity, continuous construction and various bright colors.
Specifically, the adhesion promoter may be a silane coupling agent to improve the adhesion of the primer to metal and plastic materials.
The thickening agent can be polyamide wax which thickens the waterborne polyurethane resin, so that the waterborne polyurethane resin has a better leveling effect in the spraying process.
The anti-settling agent can be fumed silica and is used for preventing the components of the water-based paint from settling and improving the storage stability of the water-based paint.
The wetting agent can be a commercial model BYK348, is used for reducing the surface tension of the water-based paint, improving the wettability of the water-based paint on a substrate and preventing the defects of shrinkage cavity, orange peel surface and the like on the surface of a paint film.
Pigments are used to impart various colors to aqueous coatings.
The dispersant can be BYK190 type, so that various pigments can be well dispersed in a coating system, and each component can be better compatible with waterborne polyurethane.
The defoaming agent can be selected from alkyne diol so as to eliminate air bubbles generated during storage and construction of the water-based paint as soon as possible and reduce or eliminate the adverse effect of the air bubbles on the surface of a paint film.
The organic matte powder is used for flatting and improving the scratch resistance of the finish paint.
Based on the multilayer water-based paint, the invention also provides a spraying method, which comprises the following steps:
and step A, mixing and diluting the component A and the component B by using deionized water, spraying the mixture on the surface of a workpiece, and drying to obtain the primer layer.
Specifically, the water-based primer can be mixed and diluted according to the following proportion, and the component A comprises the following components: and B component: deionized water 10: 10: (1-2), then spraying the primer on the surface of the metal/plastic assembly, baking, and baking for 40-60min at 60-80 ℃. The primer layer disclosed by the invention has good adhesion to plastic materials and metal materials, has good acid and alkali resistance, boiling resistance and salt mist resistance, is strong in covering property, can cover connecting seams of plastics and hardware, and is easy to polish and rework. In addition, the construction life of the mixed A/B component is longer than 4H, and the construction property is good.
And step B, diluting the intermediate coat by using deionized water, spraying the diluted intermediate coat on the primer layer, and drying to obtain the connecting layer.
Specifically, the aqueous medium paint can be mixed and diluted according to the following proportion: deionized water 10: (1-3), then spraying the intermediate paint on the primer, baking, and baking for 20-40min at 60-80 ℃.
And step C, mixing and diluting the component C and the component D by using deionized water, spraying the mixture on the intermediate paint layer, drying to obtain a protective layer, and finishing spraying.
Specifically, the water-based finish paint can be mixed and diluted according to the following proportion, and the component C comprises the following components: and (D) component: deionized water 10: 1: (1-2), then spraying the finish paint on the primer paint, and baking for 180-240min at 60-80 ℃.
The invention is further illustrated by the following specific examples. Wherein the components of each coating of examples one to three are as shown in tables 1 to 5.
Table 1 examples one to three primers a component details
Table 2 examples one to three primers, B component, detailed description
| Example one | Example two | EXAMPLE III | |
| Aqueous polyamide resin | 42 | 45 | 53 |
| Thickening agent | 0.6 | 0.8 | 0.5 |
| Anti-settling agent | 1.2 | 1.1 | 1.1 |
| Substrate wetting agent | 0.4 | 0.4 | 0.3 |
| Pigment (I) | 18 | 16 | 16 |
| Wetting and dispersing agent | 3.5 | 3.7 | 3.7 |
| Defoaming agent | 0.4 | 0.5 | 0.4 |
| Leveling agent | 0.5 | 0.5 | 0.5 |
| Deionized water | 33.4 | 32 | 24.5 |
Table 3 details of the paint components in examples one through three
| Example one | Example two | EXAMPLE III | |
| Aqueous polyurethane | 40 | 42 | 45 |
| PH regulator | 0.15 | 0.2 | 0.18 |
| Thickening agent | 4 | 4.2 | 4.1 |
| Anti-settling agent | 0.5 | 0.5 | 0.5 |
| Pigment (I) | 10 | 8 | 7 |
| Wetting and dispersing agent | 3.5 | 3.7 | 3.7 |
| Molding aid | 12 | 10 | 11 |
| Leveling agent | 0.2 | 0.2 | 0.2 |
| Defoaming agent | 0.8 | 0.8 | 0.6 |
| Deionized water | 28.85 | 30.4 | 27.72 |
Table 4 example one through example three side paint C component details
| Example one | Example two | EXAMPLE III | |
| Aqueous hydroxyl polyurethane | 80 | 78 | 75 |
| Defoaming agent | 0.1 | 0.2 | 0.1 |
| Molding aid | 4 | 5 | 5 |
| Substrate wetting agent | 0.5 | 0.6 | 0.6 |
| Leveling agent | 0.6 | 0.5 | 0.5 |
| Thickening agent | 0.5 | 0.8 | 1 |
| Organic matt powder | 6 | 6.8 | 8 |
| Deionized water | 8.3 | 8.1 | 9.8 |
Table 5 example one through example three-sided paint D component details
| Example one | Example two | EXAMPLE III | |
| Aqueous isocyanates | 70 | 80 | 75 |
| Molding aid | 30 | 20 | 25 |
According to the formula, mixing and diluting are carried out according to the following proportion:
the primer A comprises the following components: and B component: deionized water 10: 10: 1, obtaining the diluted primer.
And (3) intermediate coating: deionized water 10: 2, obtaining the diluted intermediate coat.
And the finishing coat comprises a component C: and (D) component: deionized water 10: 1: and 1, obtaining the diluted finishing paint.
Spraying:
step one, spraying a diluted primer on the surface of a workpiece of the metal-plastic assembly, and baking for 50min at 70 ℃.
And step two, spraying the diluted Chinese lacquer on the primer, and baking for 30min at 70 ℃.
And step three, spraying the diluted finish paint on the Chinese lacquer, and baking for 200min at 80 ℃ to obtain a sprayed coloring product.
The samples of the three examples were subjected to the performance test, and the test items and results are shown in table 6 below.
Table 6 results of testing samples of examples one to three
As can be seen from the above description, compared with the prior art, the beneficial effects of the present invention are: the multilayer water-based paint comprises a primer, a middle paint and a finish, wherein the primer has good adhesive force to metal materials and plastic materials, the middle paint has good interlayer bonding force, and the color required by pigment preparation can be compatible; the finish paint is formed on the surface of the intermediate paint to protect the whole paint layer, so that the smoothness, wear resistance and elasticity of the surface are increased, the hand feeling is smooth, and the drying temperature can be controlled to be not more than 80 ℃ in the whole spraying process and is below the temperature which can be borne by plastic materials.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A multi-layer water-based paint is characterized by comprising a primer, a middle paint and a finish paint;
the primer comprises a component A and a component B; the component A takes water-based epoxy resin as main body resin, the component B takes water-based polyamide resin as main body resin, the two components are mixed and sprayed on the surface of a workpiece, and a chemical reaction is carried out on the surface of the workpiece to form a primer layer;
the intermediate paint takes water-based polyurethane as main body resin and is used for spraying and adhering to the primer layer to form a connecting layer;
the finish paint comprises a component C and a component D; the component C takes water-based hydroxyl polyurethane as main resin, the component D takes water-based isocyanate as main resin, the two components are mixed and sprayed on the connecting layer, and chemical reaction is carried out on the connecting layer to form a protective layer.
2. The multilayer waterborne coating of claim 1, wherein the primer is characterized in that the component A comprises, in weight percent: 80-86% of water-based epoxy resin, 2-3% of adhesion promoter, 4-6.5% of film-forming assistant and 5-14% of deionized water;
the component B comprises the following components in percentage by weight:
40-60% of water-based polyamide resin, 0.5-0.8% of thickening agent, 1-2% of anti-settling agent, 0.4-0.6% of wetting agent, 15-35% of pigment, 1-4% of dispersing agent, 0.4-0.6% of defoaming agent, 0.5-1% of flatting agent and 20-35% of deionized water.
3. The multilayer waterborne coating of claim 1, wherein the intermediate coat comprises, in weight percent: 35-50% of waterborne polyurethane, 0.1-0.2% of pH regulator, 4-6% of thickening agent, and anti-settling agent: 0.5-1%, 7-25% of pigment, 1-4% of dispersing agent, 10-15% of film-forming assistant, 0.1-0.3% of flatting agent, 0.5-1% of defoaming agent and 20-35% of deionized water.
4. The multilayer water-based paint according to claim 1, wherein the component C in the finish paint comprises the following components in percentage by weight: 70-80% of water-based hydroxyl polyurethane, 0.1-0.2% of defoaming agent, 4-6% of film-forming additive, 0.4-0.6% of wetting agent, 0.4-0.6% of flatting agent, 0.5-1% of thickening agent, 6-8% of organic matte powder and 5-15% of deionized water;
the component D comprises the following components in percentage by weight: 70-80% of water-based isocyanate and 20-30% of film-forming assistant.
5. The multilayer waterborne coating of claim 4, wherein the primer is characterized in that the component A comprises, in weight percent: 82% of waterborne epoxy resin, 2% of adhesion promoter, 6% of film-forming assistant and 10% of deionized water;
the component B comprises: 45% of water-based polyamide resin, 0.8% of thickening agent, 1.1% of anti-settling agent, 0.4% of wetting agent, 16% of pigment, 3.7% of dispersing agent, 0.5% of defoaming agent, 0.5% of flatting agent and 32% of deionized water;
the middle paint comprises: 42% of waterborne polyurethane, 0.2% of pH regulator, 4.2% of thickener, and anti-settling agent: 0.5 percent of pigment, 8 percent of dispersing agent, 3.7 percent of film-forming additive, 10 percent of flatting agent, 0.2 percent of defoaming agent and 30.4 percent of deionized water;
in the finish paint, the component C comprises: 78% of water-based hydroxyl polyurethane, 0.2% of defoaming agent, 5% of film-forming assistant, 0.6% of wetting agent, 0.5% of flatting agent, 0.8% of thickening agent, 6.8% of organic matte powder and 8.1% of deionized water;
the component D comprises: 80% of water-based isocyanate and 20% of film-forming assistant.
6. The multilayer waterborne coating of any one of claims 1-5, wherein the waterborne epoxy resin comprises greater than 10 secondary hydroxyl groups.
7. A method of spraying a multilayer aqueous coating material according to any one of claims 1 to 6, comprising:
step A, mixing and diluting the component A and the component B by using deionized water, spraying the mixture on the surface of a workpiece, and drying to obtain a primer layer;
step B, diluting the intermediate coat by using deionized water, spraying the diluted intermediate coat on the primer layer, and drying to obtain a connecting layer;
and step C, mixing and diluting the component C and the component D by using deionized water, spraying the mixture on the intermediate paint layer, drying to obtain a protective layer, and finishing spraying.
8. The spraying method according to claim 7, wherein in the step A, the dilution ratio is A component: and B component: deionized water 10: 10: (1-2), the drying conditions are as follows: baking at 60-80 deg.C for 40-60 min.
9. The spraying method according to claim 7, wherein in the step B, the dilution ratio is that of the medium paint: deionized water 10: (1-3), the drying conditions are as follows: baking at 60-80 deg.C for 20-40 min.
10. The spraying method according to claim 7, wherein in the step C, the dilution ratio is C component: and (D) component: deionized water 10: 1: (1-2), the drying conditions are as follows: baking at 60-80 deg.C for 180-240 min.
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| CN114395331A (en) * | 2021-12-21 | 2022-04-26 | 卡秀万辉(无锡)高新材料有限公司 | Preparation method of water-based elastic hand feeling coating |
| CN114921135A (en) * | 2022-06-21 | 2022-08-19 | 万辉(广州)高新材料有限公司 | Washable temporary decorative coating for soft PVC (polyvinyl chloride), and preparation method and application thereof |
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Application publication date: 20210810 |