CN111253852A - PU white primer capable of being thickly coated on vertical surface and preparation method thereof - Google Patents
PU white primer capable of being thickly coated on vertical surface and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of coatings, in particular to a PU white primer capable of being thickly coated on a vertical surface and a preparation method thereof. The PU white primer capable of being thickly coated on the vertical face is matched with the modified thixotropic acrylic resin through the polyamide wax, the type of the solvent is not limited, the thixotropic performance of the paint is greatly improved, the storage stability is good, the paint has higher solid content, the VOC is low, the paint is safe and environment-friendly, and the PU white primer can be used for thickly coating the vertical face of colored furniture without sagging, has good adhesiveness, reduces the coating number of the primer and improves the working efficiency of furniture factories.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to PU white primer capable of being coated in a vertical surface thick mode and a preparation method thereof.
Background
With the rapid development of social economy, the life rhythm of people is accelerated, the requirement on the coating efficiency of solid wood furniture is more and more strict, the colored paint spraying is required to be carried out immediately, and the film thickness is required to reach 440g/m2The coating does not sag. At present, white polyurethane paint on the market has good flatness, good filling property, easy polishing and good adhesion when being sprayed on a plane, but in the process of spraying on a vertical surface, due to the reason of large specific gravity, the paint film is easy to sag, the filling property is not enough and the like, thereby seriously influencing the delivery cycle of furniture.
The existing method for improving the anti-sagging property of the vertical spraying mainly comprises the steps of increasing the drying speed of a paint film, increasing the spraying viscosity of a system and adding an anti-sagging auxiliary agent. The method is characterized in that the problem of the adhesion of PU white paint in vertical thick coating is caused by increasing the drying speed of a paint film, the influence of the improvement of the spraying viscosity of a system on the operability is large, a proper amount of common anti-sagging auxiliary agents such as fumed silica, organic bentonite, polyamide wax, oxidized polyethylene wax, polyurea compounds and the like are added to cause sagging when the vertical surface is thick coated, and the problem of the adhesion of the vertical surface is caused when the vertical surface is excessive.
Disclosure of Invention
One of the purposes of the invention is to provide a PU white primer capable of being coated in a vertical surface thick manner, aiming at the defects in the prior art, and the aim of preventing sagging in the vertical surface thick manner is achieved by matching polyamide wax with modified thixotropic acrylic resin.
The second purpose of the present invention is to provide a method for preparing a PU white primer capable of vertical surface thick coating, aiming at the defects of the prior art.
In order to achieve one of the purposes, the invention adopts the following technical scheme:
providing a PU white primer capable of being coated in a vertical face thick mode, wherein the PU white primer is formed by mixing a component A and a component B, and the mass ratio of the component A to the component B is 1.5-2.5: 1;
the component A comprises the following raw materials in parts by weight:
preferably, the PU white primer capable of being coated in a vertical face thick mode is formed by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 1.7-2.3: 1;
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
68-76 parts of polyisocyanate
19-22 parts of n-butyl acetate
4-5 parts of propylene glycol methyl ether propionate.
More preferably, the PU white primer capable of being coated in a vertical face thick mode is formed by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 2: 1;
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
75 parts of polyisocyanate
20 portions of n-butyl acetate
4.5 parts of propylene glycol methyl ether propionate.
Specifically, the alkyd resin comprises the following raw materials in parts by weight: 20-30 parts of modified saturated polyester alkyd resin and 10-20 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 18-24 parts of titanium dioxide, 10-15 parts of talcum powder, 15-20 parts of heavy calcium carbonate and 2-4 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 25-35 parts of TDI tripolymer and 40-50 parts of TDI addition product.
Specifically, the alkyd resin comprises the following raw materials in parts by weight: 23-27 parts of modified saturated polyester alkyd resin and 13-17 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 18-20 parts of titanium dioxide, 10-12 parts of talcum powder, 16-18 parts of heavy calcium carbonate and 2.5-3.5 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 27-33 parts of TDI trimer and 43-47 parts of TDI addition product.
Specifically, the alkyd resin comprises the following raw materials in parts by weight: 25 parts of modified saturated polyester alkyd resin and 15 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 19 parts of titanium dioxide, 11 parts of talcum powder, 17 parts of heavy calcium carbonate and 3 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 30 parts of TDI trimer and 45 parts of TDI adduct.
In order to achieve the second purpose, the invention adopts the following technical scheme:
the preparation method of the PU white primer capable of being coated in a vertical surface thick mode comprises the following steps:
step one, preparing a first mixture of a component A: mixing the alkyd resin, the modified thixotropic acrylic resin, the defoaming agent, the dispersing agent and the propylene glycol monomethyl ether acetate according to the formula ratio, and uniformly stirring to obtain a first mixture of the component A;
step two, preparing a second mixture of the component A: adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and uniformly stirring to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding and dispersing the second mixture of the component A obtained in the step two to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and uniformly stirring to obtain the component A;
step five, preparing a component B: uniformly mixing the polyisocyanate, the n-butyl acetate and the propylene glycol monomethyl ether propionate according to the formula ratio to obtain a component B;
step six, preparing a product: and (4) mixing the component A obtained in the fourth step with the component B obtained in the fifth step to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
In the technical scheme, in the first step, the alkyd resin, the modified thixotropic acrylic resin, the defoaming agent, the dispersing agent and the propylene glycol monomethyl ether acetate in the formula amount are mixed, and stirred at 700-900 rpm for 15-25 min to obtain a first mixture of the component A; in the second step, the extender pigment with the formula amount is slowly added into the first mixture of the component A obtained in the first step, and the mixture is stirred at the speed of 900-1100 rpm for 25-35 min to obtain a second mixture of the component A.
In the technical scheme, in the third step, the second mixture of the component A obtained in the second step is ground to the fineness of 30-40 μm to obtain a third mixture of the component A; in the fourth step, n-butyl acetate, cellulose nitrate, a leveling agent and polyamide wax in the formula amount are added into the third mixture of the component A obtained in the third step, and the mixture is stirred at the speed of 700-900 rpm for 15-25 min to obtain the component A.
In the technical scheme, in the fifth step, the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate in the formula amount are stirred at the speed of 300-500 rpm for 5-15 min to obtain a component B; and in the sixth step, uniformly mixing the component A obtained in the fourth step and the component B obtained in the fifth step according to the mass ratio of 1.5-2.5: 1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
The invention has the beneficial effects that:
the invention provides a PU white primer capable of being coated in a vertical face thick mode, which is formed by mixing a component A and a component B, wherein the component A comprises alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent, propylene glycol methyl ether acetate, an extender pigment, n-butyl acetate, cellulose nitrate, a leveling agent and polyamide wax, and the component B comprises polyisocyanate, n-butyl acetate and propylene glycol methyl ether propionate. The PU white primer capable of being thickly coated on the vertical surface solves the problem of sagging prevention by matching the polyamide wax with the modified thixotropic acrylic resin, and meanwhile, the type of the solvent is not limited, so that the thixotropic property is greatly improved in the coating mixing process, the storage stability is good, the solid content is high, the VOC is low, and the PU white primer is safe and environment-friendly; the PU white primer capable of being thickly coated on the vertical surface can be used for thickly coating the vertical surface of colored furniture without sagging, has good adhesion, reduces the coating number of the primer, and improves the working efficiency of furniture factories.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1.
A PU white primer capable of being coated thickly on a vertical surface is formed by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 2:1, wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the preparation method of the PU white primer capable of being thickly coated on the vertical surface comprises the following steps:
step one, preparing a first mixture of a component A: mixing alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent and propylene glycol monomethyl ether acetate according to the formula ratio, and stirring at the speed of 800rpm for 20min to obtain a first mixture of a component A;
step two, preparing a second mixture of the component A: slowly adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and stirring for 30min at the speed of 1000rpm to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding the second mixture of the component A obtained in the step two to the fineness of 35 mu m to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and stirring at the speed of 800rpm for 20min to obtain the component A;
step five, preparing a component B: stirring the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate with the formula ratio at the speed of 400rpm for 10min to obtain a component B;
step six, preparing a product: and (4) uniformly mixing the component A obtained in the fourth step with the component B obtained in the fifth step according to the mass ratio of 2:1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
Example 2.
A PU white primer capable of being coated thickly on a vertical surface is formed by mixing a component A and a component B, the mass ratio of the component A to the component B is 1.7:1, wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the preparation method of the PU white primer capable of being thickly coated on the vertical surface comprises the following steps:
step one, preparing a first mixture of a component A: mixing alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent and propylene glycol monomethyl ether acetate according to a formula ratio, and stirring at the speed of 750rpm for 23min to obtain a first mixture of a component A;
step two, preparing a second mixture of the component A: slowly adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and stirring for 33min at the speed of 950rpm to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding the second mixture of the component A obtained in the step two to the fineness of 33 mu m to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and stirring at the speed of 750rpm for 23min to obtain the component A;
step five, preparing a component B: stirring the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate with the formula ratio at the speed of 350rpm for 13min to obtain a component B;
step six, preparing a product: and (4) uniformly mixing the component A obtained in the fourth step with the component B obtained in the fifth step according to the mass ratio of 1.7:1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
Example 3.
A PU white primer capable of being thickly coated on a vertical surface is formed by mixing a component A and a component B, the mass ratio of the component A to the component B is 2.3:1, wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the preparation method of the PU white primer capable of being thickly coated on the vertical surface comprises the following steps:
step one, preparing a first mixture of a component A: mixing alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent and propylene glycol monomethyl ether acetate according to the formula ratio, and stirring at 850rpm for 17min to obtain a first mixture of a component A;
step two, preparing a second mixture of the component A: slowly adding the formula amount of the extender pigment into the first mixture of the component A obtained in the step one, and stirring at 1050rpm for 27min to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding the second mixture of the component A obtained in the step two to the fineness of 37 mu m to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and stirring at 850rpm for 17min to obtain the component A;
step five, preparing a component B: stirring the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate with the formula ratio for 7min at the speed of 450rpm to obtain a component B;
step six, preparing a product: and (4) uniformly mixing the component A obtained in the fourth step with the component B obtained in the fifth step according to the mass ratio of 2.3:1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
Example 4.
A PU white primer capable of being coated thickly on a vertical surface is formed by mixing a component A and a component B, the mass ratio of the component A to the component B is 1.5:1, wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the preparation method of the PU white primer capable of being thickly coated on the vertical surface comprises the following steps:
step one, preparing a first mixture of a component A: mixing alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent and propylene glycol monomethyl ether acetate according to the formula ratio, and stirring at 700rpm for 25min to obtain a first mixture of a component A;
step two, preparing a second mixture of the component A: slowly adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and stirring at the speed of 900rpm for 35min to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding the second mixture of the component A obtained in the step two to the fineness of 30 mu m to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and stirring at the speed of 700rpm for 25min to obtain the component A;
step five, preparing a component B: stirring the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate with the formula ratio for 15min at the speed of 300rpm to obtain a component B;
step six, preparing a product: and (4) uniformly mixing the component A obtained in the fourth step with the component B obtained in the fifth step according to the mass ratio of 1.5:1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
Example 5.
A PU white primer capable of being coated thickly on a vertical surface is formed by mixing a component A and a component B, the mass ratio of the component A to the component B is 2.5:1, wherein,
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
the preparation method of the PU white primer capable of being thickly coated on the vertical surface comprises the following steps:
step one, preparing a first mixture of a component A: mixing alkyd resin, modified thixotropic acrylic resin, a defoaming agent, a dispersing agent and propylene glycol monomethyl ether acetate according to the formula ratio, and stirring at 900rpm for 15min to obtain a first mixture of a component A;
step two, preparing a second mixture of the component A: slowly adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and stirring at the speed of 1100rpm for 25min to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding the second mixture of the component A obtained in the step two to the fineness of 40 mu m to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and stirring at 900rpm for 15min to obtain the component A;
step five, preparing a component B: stirring the polyisocyanate, the n-butyl acetate and the propylene glycol monomethyl ether propionate with the formula ratio at the speed of 500rpm for 5min to obtain a component B;
step six, preparing a product: and (4) uniformly mixing the component A obtained in the fourth step with the component B obtained in the fifth step according to the mass ratio of 2.5:1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A PU white primer capable of being coated on a vertical surface in a thick mode is characterized in that: the adhesive is formed by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 1.5-2.5: 1;
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
65-80 parts of polyisocyanate
16-25 parts of n-butyl acetate
3-6 parts of propylene glycol methyl ether propionate.
2. The PU white primer capable of being thickly coated on a vertical surface according to claim 1, wherein: the adhesive is formed by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 1.7-2.3: 1;
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
68-76 parts of polyisocyanate
19-22 parts of n-butyl acetate
4-5 parts of propylene glycol methyl ether propionate.
3. The PU white primer capable of being thickly coated on a vertical surface according to claim 1, wherein: the paint is prepared by mixing a component A and a component B, wherein the mass ratio of the component A to the component B is 2: 1;
the component A comprises the following raw materials in parts by weight:
the component B comprises the following raw materials in parts by weight:
75 parts of polyisocyanate
20 portions of n-butyl acetate
4.5 parts of propylene glycol methyl ether propionate.
4. The PU white primer capable of being thickly coated on a vertical surface according to claim 1, wherein: the alkyd resin comprises the following raw materials in parts by weight: 20-30 parts of modified saturated polyester alkyd resin and 10-20 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 18-24 parts of titanium dioxide, 10-15 parts of talcum powder, 15-20 parts of heavy calcium carbonate and 2-4 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 25-35 parts of TDI tripolymer and 40-50 parts of TDI addition product.
5. A vertically face-thickly coatable PU white primer according to claim 4, characterized in that: the alkyd resin comprises the following raw materials in parts by weight: 23-27 parts of modified saturated polyester alkyd resin and 13-17 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 18-20 parts of titanium dioxide, 10-12 parts of talcum powder, 16-18 parts of heavy calcium carbonate and 2.5-3.5 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 27-33 parts of TDI trimer and 43-47 parts of TDI addition product.
6. A vertically face-thickly coatable PU white primer according to claim 4, characterized in that: the alkyd resin comprises the following raw materials in parts by weight: 25 parts of modified saturated polyester alkyd resin and 15 parts of castor oil alkyd resin, wherein the extender pigment comprises the following raw materials in parts by weight: 19 parts of titanium dioxide, 11 parts of talcum powder, 17 parts of heavy calcium carbonate and 3 parts of zinc powder, wherein the polyisocyanate comprises the following raw materials in parts by weight: 30 parts of TDI trimer and 45 parts of TDI adduct.
7. The process for preparing a vertically thickly coatable PU white primer according to any one of claims 1 to 6, wherein: it comprises the following steps:
step one, preparing a first mixture of a component A: mixing the alkyd resin, the modified thixotropic acrylic resin, the defoaming agent, the dispersing agent and the propylene glycol monomethyl ether acetate according to the formula ratio, and uniformly stirring to obtain a first mixture of the component A;
step two, preparing a second mixture of the component A: adding the extender pigment with the formula amount into the first mixture of the component A obtained in the step one, and uniformly stirring to obtain a second mixture of the component A;
step three, preparing a third mixture of the component A: grinding and dispersing the second mixture of the component A obtained in the step two to obtain a third mixture of the component A;
step four, preparing a component A: adding n-butyl acetate, cellulose nitrate, a flatting agent and polyamide wax in a formula amount into the third mixture of the component A obtained in the step three, and uniformly stirring to obtain the component A;
step five, preparing a component B: uniformly mixing the polyisocyanate, the n-butyl acetate and the propylene glycol monomethyl ether propionate according to the formula ratio to obtain a component B;
step six, preparing a product: and (4) mixing the component A obtained in the fourth step with the component B obtained in the fifth step to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
8. The method for preparing PU white primer capable of being vertically and thickly coated according to claim 7, wherein the method comprises the following steps: in the first step, mixing the alkyd resin, the modified thixotropic acrylic resin, the defoaming agent, the dispersing agent and propylene glycol methyl ether acetate according to the formula ratio, and stirring at 700-900 rpm for 15-25 min to obtain a first mixture of the component A;
in the second step, the extender pigment with the formula amount is slowly added into the first mixture of the component A obtained in the first step, and the mixture is stirred at the speed of 900-1100 rpm for 25-35 min to obtain a second mixture of the component A.
9. The method for preparing PU white primer capable of being vertically and thickly coated according to claim 7, wherein the method comprises the following steps: in the third step, the second mixture of the component A obtained in the second step is ground to the fineness of 30-40 μm to obtain a third mixture of the component A;
in the fourth step, n-butyl acetate, cellulose nitrate, a leveling agent and polyamide wax in the formula amount are added into the third mixture of the component A obtained in the third step, and the mixture is stirred at the speed of 700-900 rpm for 15-25 min to obtain the component A.
10. The method for preparing PU white primer capable of being vertically and thickly coated according to claim 7, wherein the method comprises the following steps: in the fifth step, the polyisocyanate, the n-butyl acetate and the propylene glycol methyl ether propionate with the formula amount are stirred for 5-15 min at the speed of 300-500 rpm, and the component B is obtained;
and in the sixth step, uniformly mixing the component A obtained in the fourth step and the component B obtained in the fifth step according to the mass ratio of 1.5-2.5: 1 to obtain the PU white primer capable of being coated on the vertical surface in a thick mode.
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