CN112646471A - BMC substrate water-based PU coating and preparation method thereof - Google Patents
BMC substrate water-based PU coating 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
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- 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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention provides a BMC substrate water-based PU coating which comprises a black PU priming paint and a black PU finishing paint; the black PU priming paint consists of a water-based PU black priming paint A component, a water-based curing agent B component and deionized water; the black PU finishing paint consists of a water-based PU black finishing paint A component, a water-based curing agent B component and deionized water; the black PU priming paint comprises a water-based PU black priming paint component A: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5 to 0.8; the black PU finishing paint comprises a water-based PU black finishing paint component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1 to 0.3; the preparation method comprises the steps of preparing an S1 waterborne PU black primer A component, preparing an S2 waterborne PU black finish A component and preparing an S3 waterborne curing agent B component; the coating has the same construction process as the solvent type PU coating, the surface gloss of the coating is higher, the fullness and the leveling property are good, the chemical resistance is excellent, and the adhesive force of the coating after the construction and drying of the water-based PU coating is good.
Description
Technical Field
The invention relates to the technical field of water-based PU coatings, in particular to a BMC substrate water-based PU coating coated by a BMC substrate and a preparation method of the water-based PU coating.
Background
The bulk molding compound BMC (bulk molding compound), also called unsaturated polyester bulk molding compound, is a material bulk prepreg obtained by thoroughly mixing GF (chopped glass fiber), UP (unsaturated resin), MD (filler calcium carbonate) and various additives as main raw materials. The BMC bulk molding compound has excellent electrical properties, mechanical properties, heat resistance and chemical corrosion resistance, is suitable for various molding processes, and can meet the requirements of various products on the properties, so the BMC bulk molding compound is more and more popular with the users. According to different final application fields, the prepared composite material can accurately control the size, has good flame retardance and electric trace resistance, high dielectric strength, corrosion resistance and pollution resistance, excellent mechanical property, low shrinkage and stable color and luster, and is very suitable for various applications with precise requirements on details and sizes. The material also has 75 optional colors, has good coating performance, and can be used for powder spraying or water-based paint coating.
In the existing production process, a BMC substrate is mostly coated with a solvent type PU coating, the VOC (volatile organic compound) content of the solvent type PU coating is not less than 600g/L, the organic solvent content is high, and the pollutant discharge amount is large. In order to meet the national environmental protection requirement, the low-carbon environmental protection, energy conservation and emission reduction type coating is developed. Therefore, the invention provides a BMC substrate water-based PU coating and a preparation method of the water-based PU coating.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a BMC substrate water-based PU coating, the VOC content of the water-based PU coating is less than 200g/L, the pollutant emission of an enterprise is reduced by 60-70% compared with that of a traditional solvent PU coating, and the water-based PU coating has good adhesive force after being dried after being constructed and dried, high glossiness, good wear resistance and excellent chemical resistance.
In order to achieve the aim, the invention provides a BMC substrate water-based PU coating, which comprises a black PU primer and a black PU finishing coat; the black PU primer consists of a water-based PU black primer component A, a water-based curing agent component B and deionized water; the black PU finishing paint consists of a water-based PU black finishing paint A component, a water-based curing agent B component and deionized water;
the black PU priming paint comprises a water-based PU black priming paint component A: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5 to 0.8;
the black PU finishing paint comprises a water-based PU black finishing paint component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1 to 0.3;
the component A of the water-based PU black primer consists of the following components in percentage by weight,
40-50% of water-based hydroxyl acrylic acid dispersoid, 10-20% of water-based polyester dispersoid, 5-10% of water-based universal black paste, 15-20% of superfine barium sulfate, 3-8% of film-forming additive, 3-5% of deionized water, 0.5-1% of dispersing agent, 1-2% of anti-settling agent, 0.5-1% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.2% of ammonia neutralizer and 1-2% of thickening agent.
The component A of the water-based PU black finish paint consists of the following components in percentage by weight,
60-70% of high-hydroxyl aqueous acrylic acid dispersoid, 10-20% of medium-hydroxyl aqueous acrylic acid dispersoid, 5-10% of aqueous nano black paste, 3-8% of film-forming additive, 3-5% of deionized water, 0.5-1% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.2% of ammonia neutralizer and 1-2% of thickening agent.
The component B of the water-based curing agent consists of 75-85 percent of water-based polyisocyanate dispersant and 15-25 percent of film-forming auxiliary agent by weight percentage.
The water-based universal black paste is a water-based dispersoid containing 20 percent of carbon black pigment;
the diameter of the superfine barium sulfate particles is 0.35-0.55 μm;
the film-forming auxiliary agent is one or a mixture of propylene glycol methyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol butyl ether, diethylene glycol ethyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether and tripropylene glycol butyl ether;
the dispersant is polyethylene glycol 200 or polyethylene glycol 400;
the anti-settling agent is fumed silica;
the wetting agent is polyether siloxane copolymer or organic silicon gemini structure surfactant, and has good coating construction and wettability, good leveling property of the coating surface and no defect.
The defoaming agent is polyether siloxane copolymer emulsion containing gas-phase silicon dioxide;
the ammonia neutralizer is N, N-dimethylethanolamine or 2-amino-2-methyl-1-propanol, has a medium volatilization rate and good storage stability.
The thickening agent is nonionic polyurethane, the aqueous thickening agent adopts a low-shear polyether polyurethane associative rheological aid, and the coating film has good sagging resistance.
The water-based nano black paste is composed of 20 percent of carbon black pigment and water-based dispersoid with the grain diameter less than 300 nanometers;
the hydroxyl acrylic acid dispersoid uses acrylic acid emulsion with the OH percent content of less than or equal to 1 percent and the TG glass transition temperature of less than or equal to 60 ℃, thereby greatly increasing the adhesive force of a coating film and a gold stamping layer.
The aqueous polyurethane dispersion mainly uses the aqueous polyurethane dispersion with the TG glass transition temperature of less than or equal to-20 ℃ and the elongation at break of more than or equal to 300, effectively reduces the shrinkage of a coating film, increases the flexibility of the coating film, and provides the adhesion between the coating film and a gold stamping layer after the coating film is soaked in water.
In order to achieve the above object, the present invention also provides a preparation method of the BMC substrate aqueous PU coating, the preparation method comprising the steps of: preparing an S1 waterborne PU black primer A component, preparing an S2 waterborne PU black finish A component and preparing an S3 waterborne curing agent B component;
the preparation method of the component A of the S1 waterborne PU black primer comprises the following steps:
s11, preparing a main material, namely putting the aqueous hydroxyl acrylic acid dispersoid into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s12, emulsification treatment, namely slowly adding the aqueous polyester dispersoid into the step S11, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s13, dispersing, namely slowly and sequentially adding a dispersing agent, an anti-settling agent and an antifoaming agent into the step S12 under the stirring state, and stirring for 5-10 minutes at the rotation speed of 450-550 rpm;
s14, performing color mixing treatment, slowly and sequentially adding superfine barium sulfate and aqueous universal black paste, and stirring for 60-90 minutes at a rotating speed of 2000-2500 rpm;
s15 standing treatment, standing for 30 minutes at room temperature, and testing the fineness of the scraper fineness meter to be less than 8 micrometers;
s16, diluting, starting a stirrer, and slowly adding deionized water, a film forming additive and a wetting agent in sequence and stirring for 3-5 minutes in a stirring state at a rotating speed of 750-850 rpm;
s17, adjusting the pH value, slowly adding an ammonia neutralizing agent under the stirring state at the rotating speed of 450-550 rpm, and adjusting the pH value to 7.5-8.0;
s18, adjusting the viscosity, slowly adding the thickening agent under the stirring state of 750-850 rpm of rotation speed, and adjusting the KU value of the viscosity, wherein the KU value of the viscosity is 55-58;
and S19 post-treatment, stirring at 750-850 rpm for 30-40 minutes, standing at room temperature for 60 minutes, and filtering the aqueous PU black primer A component by a 200-mesh filter and packaging into a black PE plastic barrel.
Preferably, the environmental temperature of the step S11 to the step S19 is 15-35 ℃, and the humidity is less than 60%.
The preparation method of the component A of the S2 waterborne PU black finish paint comprises the following steps:
s21, preparing a main material, namely putting the high-hydroxyl aqueous acrylic acid dispersoid into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s22, emulsifying, namely slowly adding the medium hydroxyl aqueous acrylic acid dispersoid into the step S21, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s23, color mixing treatment, namely slowly adding the aqueous nano black paste, and stirring for 5-10 minutes at the rotating speed of 450-550 rpm;
s24, diluting, namely, premixing deionized water and a film-forming aid, slowly adding the deionized water and the film-forming aid, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s25, defoaming, namely, slowly adding a defoaming agent and a wetting agent in sequence, and stirring at the rotation speed of 450-550 rpm for 3-5 minutes;
s26, adjusting the pH value, slowly adding an ammonia neutralizing agent under the stirring state at the rotating speed of 450-550 rpm, and adjusting the pH value to 7.5-8.0;
s27, adjusting the viscosity, slowly adding the thickening agent under the stirring state of 750-850 rpm of rotation speed, and adjusting the KU value of the viscosity, wherein the KU value of the viscosity is 50-52;
and S28 post-treatment, stirring at 750-850 rpm for 30-40 minutes, standing at room temperature for 60 minutes, and filtering the component A of the waterborne PU black finish paint by a 300-mesh sieve and packaging into a black PE plastic barrel.
Preferably, the environmental temperature of the step S21 to the step S28 is 15-35 ℃, and the humidity is less than 60%.
The preparation of the component B of the S3 waterborne curing agent comprises the following steps:
s31, preparing a main material, namely adding the aqueous polyisocyanate dispersing agent into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s32, film forming treatment, namely slowly adding a film forming auxiliary agent in a stirring state, and stirring for 10-15 minutes at the rotating speed of 450-550 rpm;
and S33 post-treatment, standing at room temperature for 30 minutes, filtering by a 300-mesh filter screen, and packaging.
Preferably, the environmental temperature of the step S31 to the step S33 is 15-35 ℃, and the humidity is less than 60%.
The water-based PU black primer A component, the water-based PU black finish A component and the water-based curing agent B component prepared by the method are prepared from the following components in parts by weight: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5-0.8 of the black PU primer; the water-based PU black finishing paint comprises a component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1-0.3, spraying the black PU finish paint on a BMC substrate of the intelligent sound box, and coating after forced drying of an oven to obtain good performance.
Compared with the prior art, the invention has the following beneficial effects:
1. the BMC substrate water-based PU coating disclosed by the invention has the same coating construction process as a solvent-based PU coating, the VOC content of the water-based PU coating in a construction state is less than 200g/L, the surface gloss of a coating film is higher, the fullness and the leveling property are good, and the chemical resistance is excellent. The pollutant emission of enterprises is reduced by 60-70% compared with the traditional solvent PU coating, and the water-based PU coating has good adhesive force after coating is dried after construction and drying, high glossiness, good wear resistance and excellent chemical resistance.
2. The BMC substrate aqueous PU coating uses the aqueous polyurethane acrylate dispersoid as a main resin, and provides coating film solvent resistance and water resistance; the acrylic emulsion containing hydroxyl is matched for dispersion, so that the overall flexibility and water resistance of the coating are improved, and the coating has good adhesive force.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, so that those skilled in the art can fully understand the technical contents of the present invention. It should be noted that the specific embodiments described herein are only for explaining the present invention and are not used to limit the present invention.
The BMC substrate water-based PU coating comprises a black PU primer and a black PU finish; the black PU priming paint consists of a water-based PU black priming paint A component, a water-based curing agent B component and deionized water; the black PU finishing paint consists of a water-based PU black finishing paint A component, a water-based curing agent B component and deionized water;
the black PU priming paint comprises a water-based PU black priming paint component A: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5 to 0.8;
the black PU finishing paint comprises a water-based PU black finishing paint component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1 to 0.3;
the component A of the water-based PU black primer consists of, by weight, 40-50% of water-based hydroxyl acrylic acid dispersoid, 10-20% of water-based polyester dispersoid, 5-10% of water-based general black paste, 15-20% of superfine barium sulfate, 3-8% of film-forming additive, 3-5% of deionized water, 0.5-1% of dispersing agent, 1-2% of anti-settling agent, 0.5-1% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.2% of ammonia neutralizer and 1-2% of thickening agent.
The component A of the water-based PU black finish paint comprises, by weight, 60-70% of high-hydroxyl water-based acrylic acid dispersoid, 10-20% of medium-hydroxyl water-based acrylic acid dispersoid, 5-10% of water-based nano black paste, 3-8% of film-forming additive, 3-5% of deionized water, 0.5-1% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.2% of ammonia neutralizer and 1-2% of thickening agent.
The invention also provides a preparation method of the BMC substrate water-based PU coating,
the preparation method comprises the following steps: preparing an S1 waterborne PU black primer A component, preparing an S2 waterborne PU black finish A component and preparing an S3 waterborne curing agent B component;
the preparation method of the S1 waterborne PU black primer A component comprises the following steps:
s11, preparing a main material, namely putting the aqueous hydroxyl acrylic acid dispersoid into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s12, emulsification treatment, namely slowly adding the aqueous polyester dispersoid into the step S11, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s13, dispersing, namely slowly and sequentially adding a dispersing agent, an anti-settling agent and an antifoaming agent into the step S12 under the stirring state, and stirring for 5-10 minutes at the rotation speed of 450-550 rpm;
s14, performing color mixing treatment, slowly and sequentially adding superfine barium sulfate and aqueous universal black paste, and stirring for 60-90 minutes at a rotating speed of 2000-2500 rpm;
s15 standing treatment, standing for 30 minutes at room temperature, and testing the fineness of the scraper fineness meter to be less than 8 micrometers;
s16, diluting, starting a stirrer, and slowly adding deionized water, a film forming additive and a wetting agent in sequence and stirring for 3-5 minutes in a stirring state at a rotating speed of 750-850 rpm;
s17, adjusting the pH value, slowly adding an ammonia neutralizing agent under the stirring state at the rotating speed of 450-550 rpm, and adjusting the pH value to 7.5-8.0;
s18, adjusting the viscosity, slowly adding the thickening agent under the stirring state of 750-850 rpm of rotation speed, and adjusting the KU value of the viscosity, wherein the KU value of the viscosity is 55-58;
and S19 post-treatment, stirring at 750-850 rpm for 30-40 minutes, standing at room temperature for 60 minutes, and filtering the aqueous PU black primer A component by a 200-mesh filter and packaging into a black PE plastic barrel.
The preparation method of the S2 waterborne PU black finish A comprises the following steps of:
s21, preparing a main material, namely putting the high-hydroxyl aqueous acrylic acid dispersoid into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s22, emulsifying, namely slowly adding the medium hydroxyl aqueous acrylic acid dispersoid into the step S21, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s23, color mixing treatment, namely slowly adding the aqueous nano black paste, and stirring for 5-10 minutes at the rotating speed of 450-550 rpm;
s24, diluting, namely, premixing deionized water and a film-forming aid, slowly adding the deionized water and the film-forming aid, and stirring for 3-5 minutes at the rotating speed of 450-550 rpm;
s25, defoaming, namely, slowly adding a defoaming agent and a wetting agent in sequence, and stirring at the rotation speed of 450-550 rpm for 3-5 minutes;
s26, adjusting the pH value, slowly adding an ammonia neutralizing agent under the stirring state at the rotating speed of 450-550 rpm, and adjusting the pH value to 7.5-8.0;
s27, adjusting the viscosity, slowly adding the thickening agent under the stirring state of 750-850 rpm of rotation speed, and adjusting the KU value of the viscosity, wherein the KU value of the viscosity is 50-52;
and S28 post-treatment, stirring at 750-850 rpm for 30-40 minutes, standing at room temperature for 60 minutes, and filtering the component A of the waterborne PU black finish paint by a 300-mesh sieve and packaging into a black PE plastic barrel.
The preparation method of the S3 waterborne curing agent B component comprises the following steps of:
s31, preparing a main material, namely adding the aqueous polyisocyanate dispersing agent into a stainless steel reactor, and continuously stirring at the rotating speed of 450-550 rpm;
s32, film forming treatment, namely slowly adding a film forming auxiliary agent in a stirring state, and stirring for 10-15 minutes at the rotating speed of 450-550 rpm;
and S33 post-treatment, standing at room temperature for 30 minutes, filtering by a 300-mesh filter screen, and packaging.
The water-based PU black primer A component, the water-based PU black finish A component and the water-based curing agent B component prepared by the method are prepared from the following components in parts by weight: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5-0.8 of black PU primer; the water-based PU black finishing paint comprises a component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: and (3) spraying the black PU finishing paint prepared by 0.1-0.3 on the BMC substrate of the intelligent sound box, and coating after forced drying of an oven to obtain good performance.
Specifically, the compounds and organic matters in the invention are fully selected from the following manufacturers and models, and the waterborne hydroxy acrylic acid dispersoid adopts Shanshui technology SPU6154-3, has good adhesion to a BMC base material and is dried quickly; the waterborne polyester dispersoid adopts winning and creating science and technology DS-1300, increases adhesive force, flexibility and recoatability; the high-hydroxyl waterborne acrylic acid dispersoid adopts 3AH0519W of same-grade science and technology, has high fullness and leveling property and no foaming at high film thickness; the medium-hydroxyl waterborne acrylic acid dispersoid adopts Shanshui scientific and technological SPU6154 and has high hardness and high alcohol resistance; the water-based universal black pulp adopts a beauty technology NW1790, the water-based nano black pulp adopts a beauty technology NT1715, the dispersion and compatibility are good, the gloss is not influenced, and the storage stability is good; the wetting agent is one or a mixture of BYK346, BYK347, BYK349, tego wet 270, tego wet 280, tegotwin 4100, tegotwin 4200 and tego surfynol 104; the defoaming agent is one or a mixture of BYK024, BYK028, tego 902w and tego 805N; the ammonia neutralizer is one or two of HaimazeoMed DMEA and Dow AMP-95; the thickener is one or more of Homeodex 299, Homeolate 350D, and Homeolate FX 1010; the water dispersible polyisocyanate is one or a mixture of more of WT31-100, WT33-100 and WL 72-100; the anti-settling agent adopts the Wolff science and technology aqueous fumed silica dispersoid WF7620N, has good anti-settling property and good anti-sagging property; the water dispersible polyisocyanate adopts one or a mixture of more of WT31-100, WT33-100 and WL72-100 which are formed by Asahi, and has long activation period and good compatibility.
The preparation method of the BMC substrate water-based PU coating disclosed by the invention comprises the following steps of preparing 100kg of water-based PU black primer A component according to a specific ratio, and referring to the examples in Table 1.
TABLE 1 percentage of component A of aqueous PU Black primer
The preparation method of the BMC substrate water-based PU coating disclosed by the invention comprises the following steps of preparing 100kg of water-based PU black finishing coat by using the specific proportion of the component A, and referring to the embodiment in Table 2.
TABLE 2 percentage table of A component of aqueous PU black top coat
| Item (Water-based PU black finishing paint A) | Finish A example one | Topcoat A example two | Topcoat A EXAMPLE III |
| High hydroxyl aqueous acrylic dispersions | 70 | 65 | 60 |
| Medium hydroxyl aqueous acrylic acid dispersion | 10 | 15 | 20 |
| Aqueous nano black slurry | 5 | 8 | 10 |
| Film forming aid | 7 | 5 | 3 |
| Deionized water | 5 | 4.5 | 3.5 |
| Wetting agent | 0.5 | 0.7 | 1 |
| Defoaming agent | 0.3 | 0.2 | 0.4 |
| Ammonia neutralizer | 0.2 | 0.1 | 0.1 |
| Thickening agent | 2 | 1.5 | 2 |
| pH value | 7.6 | 7.8 | 7.9 |
| KU value | 50.94 | 51.11 | 51.54 |
The preparation method of the BMC substrate water-based PU coating disclosed by the invention comprises the following steps of preparing 100kg of water-based curing agent B component according to a specific ratio shown in an example in a table 3.
TABLE 3 percentage table of B component of aqueous curing agent
| Item (Water-based curing agent B) | Curing agent B example one | Curing agent B example two | Curing agent B example III |
| Aqueous polyisocyanate dispersants | 75 | 80 | 85 |
| Film forming aid | 25 | 20 | 15 |
10kg of the aqueous PU black primer A component, the aqueous PU black finishing paint A component and the aqueous curing agent B component which are prepared by the method are prepared according to the mixture ratio shown in the table 4 and are respectively used for spraying test:
the water-based PU black primer A comprises the following components: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5-0.8 of black PU primer; the water-based PU black finishing paint comprises a component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1-0.3 of black PU finish.
TABLE 4 Black PU coating formulation
| Item | Example one | Example two | EXAMPLE III |
| Black PU primer | 8.1：1.1：0.8 | 8.2：1.2：0.6 | 8.3：1.2：0.5 |
| Black PU finishing coat | 6.8：2.5：0.7 | 7：2.4：0.6 | 7.3：2.2：0.5 |
The black PU coating is sprayed on a BMC substrate of the intelligent sound box, and a coating film obtained after forced drying of an oven is tested to obtain a good performance table 5.
The concrete construction process of spraying is as follows: the method comprises the steps of smart sound box BMC base material → pretreatment → 240# abrasive paper grinding → water-based PU black primer spraying → baking and drying at 60-70 degrees of temperature → offline 400-mesh abrasive paper grinding → water-based PU black primer spraying → baking and drying at 60-70 degrees of temperature → offline 800-mesh abrasive paper grinding → water-based PU black finish spraying → baking and drying at 60-70 degrees of temperature → offline 1500-mesh abrasive paper grinding → water-based PU black finish spraying → baking and drying at 60-70 degrees of temperature → offline packaging.
TABLE 5 black PU coating film Properties
The BMC substrate water-based PU coating disclosed by the invention has the same coating construction process as a solvent-based PU coating, the VOC content of the water-based PU coating in a construction state is less than 200g/L, the surface gloss of a coating film is higher, the fullness and the leveling property are good, and the chemical resistance is excellent. The pollutant emission of enterprises is reduced by 60-70% compared with the traditional solvent PU coating, and the water-based PU coating has good adhesive force after coating is dried after construction and drying, high glossiness, good wear resistance and excellent chemical resistance.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A BMC substrate water-based PU coating is characterized in that: the water-based PU coating comprises black PU priming paint and black PU finishing paint; the black PU primer consists of a water-based PU black primer component A, a water-based curing agent component B and deionized water; the black PU finishing paint consists of a water-based PU black finishing paint A component, a water-based curing agent B component and deionized water; the black PU priming paint comprises a water-based PU black priming paint component A: and the water-based curing agent B comprises the following components: deionized water 8: 1: 0.5 to 0.8; the black PU finishing paint comprises a water-based PU black finishing paint component A: and the water-based curing agent B comprises the following components: deionized water 3: 1: 0.1 to 0.3.
2. The BMC substrate aqueous PU coating of claim 1, wherein: the component A of the water-based PU black primer consists of, by weight, 40-50% of a water-based hydroxyl acrylic acid dispersoid, 10-20% of a water-based polyester dispersoid, 5-10% of a water-based general black paste, 15-20% of superfine barium sulfate, 3-8% of a film-forming additive, 3-5% of deionized water, 0.5-1% of a dispersant, 1-2% of an anti-settling agent, 0.5-1% of a wetting agent, 0.2-0.5% of an antifoaming agent, 0.1-0.2% of an ammonia neutralizing agent and 1-2% of a thickening agent.
3. The BMC substrate aqueous PU coating of claim 1, wherein: the component A of the water-based PU black finish paint comprises, by weight, 60-70% of high-hydroxyl water-based acrylic acid dispersoid, 10-20% of medium-hydroxyl water-based acrylic acid dispersoid, 5-10% of water-based nano black paste, 3-8% of film-forming additive, 3-5% of deionized water, 0.5-1% of wetting agent, 0.2-0.5% of defoaming agent, 0.1-0.2% of ammonia neutralizer and 1-2% of thickening agent.
4. The BMC substrate aqueous PU coating of claim 1, wherein: the component B of the water-based curing agent consists of 75-85 percent of water-based polyisocyanate dispersant and 15-25 percent of film-forming auxiliary agent by weight percentage.
5. The BMC substrate aqueous PU coating according to any one of claims 2 to 4, characterized in that: the film-forming assistant is one or a mixture of propylene glycol methyl ether acetate, dipropylene glycol methyl ether acetate, diethylene glycol butyl ether, diethylene glycol ethyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether and tripropylene glycol butyl ether.
6. The BMC substrate aqueous PU coating according to claim 2 or 3, characterized in that: the wetting agent is polyether siloxane copolymer or organic silicon gemini structure surfactant; the ammonia neutralizer is N, N-dimethylethanolamine or 2-amino-2-methyl-1-propanol.
7. The preparation method of the BMC substrate water-based PU coating according to any one of claims 1 to 6, characterized by comprising the steps of: preparing an S1 waterborne PU black primer A component, preparing an S2 waterborne PU black finish A component and preparing an S3 waterborne curing agent B component.
8. The preparation method of the BMC substrate water-based PU coating of claim 7, wherein the preparation of the S1 water-based PU black primer A component comprises the following steps:
s11, preparing a main material, namely adding the aqueous hydroxyl acrylic acid dispersoid into a stainless steel reactor, and continuously stirring;
s12 emulsification treatment, namely slowly adding the aqueous polyester dispersion into the step S11 and stirring;
s13, dispersing, namely slowly and sequentially adding a dispersing agent, an anti-settling agent and an antifoaming agent into the step S12 under the stirring state;
s14, color mixing treatment, namely slowly and sequentially adding superfine barium sulfate and aqueous universal black paste and stirring;
s15 standing treatment, standing for 30 minutes at room temperature, and testing fineness by a scraper fineness meter;
s16, diluting, and sequentially and slowly adding deionized water, a film-forming additive and a wetting agent in a stirring state;
s17, adjusting the pH value, slowly adding an ammonia neutralizer under the stirring state, and adjusting the pH value;
s18, adjusting the viscosity, slowly adding a thickening agent in a stirring state, and adjusting the KU value of the viscosity;
and (8) carrying out post-treatment on the S19, and standing at room temperature for 60 minutes to obtain the waterborne PU black primer A group.
9. The preparation method of the BMC substrate water-based PU coating of claim 7, wherein the preparation of the S2 water-based PU black top coat A component comprises the following steps:
s21, preparing a main material, namely putting the high-hydroxyl aqueous acrylic acid dispersoid into a stainless steel reactor, and continuously stirring;
s22 emulsification treatment, namely slowly adding a medium-hydroxyl aqueous acrylic acid dispersion into the step S21;
s23, color mixing treatment, namely slowly adding the water-based nano black paste in a stirring state;
s24, diluting, namely, premixing deionized water and a film-forming auxiliary agent and then slowly adding the mixture;
s25, defoaming treatment, namely, slowly adding a defoaming agent and a wetting agent in sequence;
s26, adjusting the pH value, slowly adding an ammonia neutralizer under the stirring state, and adjusting the pH value;
s27, adjusting the viscosity, slowly adding a thickening agent in a stirring state, and adjusting the KU value of the viscosity;
and S28 post-treatment, and standing at room temperature for 60 minutes to obtain the component A of the water-based PU black finish.
10. The preparation method of the BMC substrate water-based PU coating of claim 7, wherein the preparation of the S3 water-based curing agent B component comprises the following steps:
s31, preparing a main material, namely adding the water-based polyisocyanate dispersing agent into a stainless steel reactor and continuously stirring;
s32 film forming treatment, namely slowly adding a film forming auxiliary agent in a stirring state;
and S33 post-treatment, standing for 30 minutes at room temperature, filtering by a filter screen and packaging.
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