CN114736604B - High-solid-content DTM polyurethane coating and preparation method thereof - Google Patents
High-solid-content DTM polyurethane 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
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6415—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63 having nitrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/68—Unsaturated polyesters
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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
- C09D7/47—Levelling agents
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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
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
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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
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention discloses a high-solid-content DTM polyurethane coating and a preparation method thereof. The high-solid-content DTM polyurethane coating comprises an A component and a B component, wherein the raw materials of the A component comprise: polyaspartic acid ester, modified resin, dispersing agent, defoaming agent, leveling agent, ultraviolet light absorber, pigment, filler, molecular sieve and solvent, wherein the component B is curing agent. The solid content of the high-solid-content DTM polyurethane coating provided by the invention can reach more than 80%, the high-solid-content DTM polyurethane coating has the characteristic of high solid content, and the thickness of a film obtained by one-step construction on a metal substrate can reach 100-150 mu m; meanwhile, the pot life of the paint can reach more than 45 minutes, and the workability of the DTM paint is obviously improved.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a high-solid-content DTM polyurethane coating and a preparation method thereof.
Background
In the field of paint corrosion prevention of metal base materials, a matched spraying mode of primer, intermediate paint and finish paint is generally adopted, and the mode has a plurality of technical problems, such as low solid content of each layer of paint and thin film forming thickness; the film forming time is long, a certain construction interval exists between layers, and the adhesion force between layers is different, so that the film forming quality is poor, and the protection effect is difficult to play. Under the background, DTM (Direct to metal) paint which can be directly applied to the metal surface is generated, and the paint can replace a multi-layer system of primer, intermediate paint and finish paint, so that the construction steps are reduced, the drying time is shortened, the spraying efficiency is greatly improved, and the cost is saved.
Pot life refers to the maximum time that the separately packaged coating components can be used after mixing. In a DTM coating system, when the viscosity of the DTM coating is increased by 50% compared with the viscosity of the DTM coating when the DTM coating is initially prepared, obvious substandard phenomenon appears on the performance of the DTM coating, so that the time for 50% of the viscosity increase compared with the viscosity of the DTM coating when the DTM coating is initially prepared is usually defined as the pot life of the DTM coating, the pot life of the DTM coating in the prior art is only about 20min, the too short pot life causes that the DTM coating can only be constructed by adopting a double-feed high-pressure airless sprayer, and the spraying time is strictly controlled, so that the workability of the DTM coating is seriously reduced, and the development of the DTM coating with longer pot life has great significance for improving the workability of the DTM coating and reducing the application difficulty of the DTM.
Disclosure of Invention
Aiming at the technical problems that the DTM coating is difficult to be widely applied due to the limitations of a spraying mode and spraying time caused by the short application period of the DTM coating in the prior art, the invention provides the high-solid DTM polyurethane coating and the preparation method thereof, wherein the application period of the high-solid DTM polyurethane coating is more than 45min, the solid content is more than 80%, the film forming thickness is between 100 and 150 mu m, the effect of a plate surface is good, and the application prospect is wide.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the high-solid DTM polyurethane coating comprises an A component and a B component, wherein the A component comprises the following raw materials in percentage by mass: 30-35% of polyaspartic acid ester, 18-23% of modified resin, 1-1.5% of dispersing agent, 0.2-0.6% of defoaming agent, 0.3-0.5% of leveling agent, 1-1.5% of ultraviolet light absorber, 10-20% of pigment, 20-32% of filler, 3-5% of molecular sieve, 8-15% of solvent, and 25-30% of curing agent as the component B by mass of the total mass of the component A; the modified resin in the component A is bio-based polyester modified polyol resin.
The high-solid-content DTM polyurethane coating provided by the invention creatively introduces the bio-based polyester modified polyol resin into the DTM polyurethane coating, the bio-based polyester modified polyol resin plays a great promotion role in prolonging the application period of the coating and improving the glossiness and the surface effect of the coating, the bio-based polyester modified polyol resin and the polyaspartic acid ester are used as main film forming substances, and are matched with dispersing agents, defoamers, flatting agents, ultraviolet light absorbers and curing agents with specific contents, and pigments, fillers, molecular sieves and solvents to prepare the DTM polyurethane coating with the solid content of more than 80%, the characteristics of high solid content are achieved, the thickness of a film obtained by one-step construction on a metal substrate can reach 100-150 mu m, and a paint film has good glossiness and surface effect; meanwhile, the pot life of the paint can reach more than 45 minutes, and the workability of the DTM paint is obviously improved.
Preferably, the bio-based polyester modified polyol resin is castor oil polyester modified polyol resin, and the preparation method specifically comprises the following steps:
step 1: after mixing castor oil, diglycol and trimethylolpropane, heating to 215-225 ℃ under the protection of nitrogen, and reacting for 0.8-1.2 h at a constant temperature;
step 2: after the reaction is completed, adipic acid and petroleum xylene are added after the temperature is reduced to below 180 ℃, after the mixture is heated and refluxed for 1.5 to 2 hours, the mixture is stirred and heated to 245 to 250 ℃, the temperature is kept for reaction until the acid value in the reaction system is less than or equal to 1 (mgKOH/g), the temperature is reduced to below 60 ℃ after the lattice viscosity is 8 to 11s (25 ℃), and butyl acetate is added and mixed uniformly, so that the castor oil modified polyester polyol resin is obtained.
Preferably, the ratio of the amounts of castor oil, diethylene glycol, trimethylolpropane, adipic acid, petroleum xylene and butyl acetate is: 60-62: 6-7: 2.5 to 3: 9-10: 14-16: 4 to 6.
Preferably, the curing agent is a mixture of HDI trimer and isophorone diisocyanate, and the preferable mass ratio of the two is: 4 to 6:1.
the curing agent prepared by mixing the HDI trimer and the isophorone diisocyanate can obviously reduce the viscosity of the coating system, so that the DTM coating can be sprayed by high-pressure airless spraying, the problem that the high-pressure airless spraying cannot be adopted due to the high viscosity commonly existing in the prior art is solved, the spraying mode of the DTM coating is widened, and the application period of the DTM coating is further prolonged.
Preferably, the solvent is a mixture of ethylene glycol butyl ether acetate and tert-butyl acetate, and the preferred mass ratio is 1-2: 1.
the mixture of the ethylene glycol butyl ether acetate and the tert-butyl acetate can enable the film forming substances, various auxiliary agents and fillers in the scheme to be dissolved and uniformly mixed, ensures the stability of the paint film, and has certain contribution to the decorative and protective properties of the paint film.
Preferably, the ultraviolet light absorber is a mixture of benzotriazole ultraviolet light absorber and hindered amine stabilizer, and the preferable mass ratio is 1-2: 1.
preferably, the dispersant is a high molecular weight block copolymer with pigment affinic groups.
Preferably, the leveling agent is polyether modified dimethylsiloxane.
Preferably, the defoamer is a fluorosilicone modified polysiloxane or a silicone based defoamer.
Preferably, the filler is at least one of barium sulfate, talcum powder, mica powder and zinc sulfate, the pigment is at least one of rutile type titanium dioxide and Kemes KC red, and the molecular sieve is 4A molecular sieve.
The invention also provides a preparation method of the high-solid-content DTM polyurethane coating, which comprises the following steps:
s1: weighing the raw materials according to the formula amount, mixing the polyaspartic acid ester and the modified resin, sequentially adding the dispersing agent and the defoaming agent in a stirring state, and uniformly stirring at 500-600 r/min;
s2: the rotating speed is regulated to 600-800 r/min, and the pigment and the filler are added and then dispersed for 10-15 min at 800-1000 r/min, and then the mixture is ground until the fineness is less than or equal to 20 mu m;
s3: adding a leveling agent, an ultraviolet absorbent, a solvent and a molecular sieve, and stirring for 15min at 600-800 r/min to obtain a component A;
s4: weighing the curing agent according to the formula amount, stirring uniformly at 500-600 r/min to obtain a component B, and subpackaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
Compared with the prior art, the preparation method of the high-solid-content DTM polyurethane coating has the advantages of simple process, environment-friendly operation, split charging of the component A and the component B prepared in steps,
the high-solid-content DTM polyurethane coating can be prepared by simple mixing in the construction process, and the prepared high-solid-content DTM polyurethane coating has long pot life and wide application prospect.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
For comparison, the raw materials in the following examples and comparative examples were each of the manufacturer type shown in table 1.
TABLE 1
The bio-based polyester modified polyol resin in the table is castor oil polyester modified polyol resin, and the preparation method comprises the following steps:
step 1: after mixing castor oil, diglycol and trimethylolpropane, heating to 215-225 ℃ under the protection of nitrogen, and carrying out heat preservation reaction for 1h;
step 2: after the reaction is finished, adipic acid is added after the temperature is reduced to below 180 ℃, after the mixture is heated and refluxed for 1.5 to 2 hours, the mixture is stirred and heated to 245 to 250 ℃, the temperature is kept for reaction until the acid value in a reaction system is less than or equal to 1 (mgKOH/g), the temperature is reduced to below 60 ℃ after the lattice pipe viscosity is 8 to 11s (25 ℃), and butyl acetate is added and mixed uniformly, so that the castor oil modified polyester polyol resin is obtained.
The mass ratios of the raw materials for the preparation of the modified resins in examples 1 to 5 are shown in the following table, and the modified resins in the comparative examples are the same as those in example 1:
in the preparation process, the dosage ratio of castor oil, diethylene glycol, trimethylolpropane, refined adipic acid, petroleum xylene and butyl acetate is as follows: 61.4:6.56:2.82:9.22:15:5.
the following examples are provided to further illustrate embodiments of the invention.
Example 1
Examples 1 to 5 respectively provide a high-solid DTM polyurethane coating, which consists of an a component and a B component, wherein the mass percentage of each raw material in the a component is shown in table 2, and the percentage of each raw material in the B component relative to the sum of the masses of the a component is shown in table 3:
TABLE 2
TABLE 3 Table 3
The preparation method of the high-solid-content DTM polyurethane coating provided in the examples 1 to 5 specifically comprises the following steps:
s1: weighing the raw materials according to the formula amount, mixing the polyaspartic acid ester and the modified resin, sequentially adding the dispersing agent and the defoaming agent in a stirring state, and uniformly stirring at 500-600 r/min;
s2: the rotating speed is regulated to 600-800 r/min, and the pigment and the filler are added and then dispersed for 15min at 800-1000 r/min, and then the mixture is ground until the fineness is less than or equal to 20 mu m;
s3: adding a leveling agent, an ultraviolet absorbent, a solvent and a molecular sieve, and stirring for 15min at 600-800 r/min to obtain a component A;
s4: weighing the curing agent according to the formula amount, stirring uniformly at 500-600 r/min to obtain a component B, and sub-packaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
Comparative example 1
This comparative example provides a polyurethane coating whose composition is the same as example 1 except that the modified resin is replaced with a kefir 670B polyester resin of equal mass, and the other components and preparation method are the same as those of example 1.
Comparative example 2
This comparative example provides a polyurethane coating whose composition is the same as in example 1 except that the modified resin in the A component is replaced with an equivalent mass of Basoff overtol 760 branched polyester polyol.
Comparative example 3
This comparative example provides a polyurethane coating whose composition is the same as example 1 except that bayer N3900 in the B-component curative is replaced with an equal mass of the vantage HT100 curative.
Comparative example 4
This comparative example provides a polyurethane coating having a composition similar to that of example 1 except that bayer N3900 in the B-component curing agent was replaced with equal mass of TLA100 resin from the asahi chemical company.
Test case
The polyurethane coatings prepared in each example and comparative example were subjected to a relevant performance test in which:
the projects examined with reference to GB30981-2020 "limit of harmful substances in Industrial protective coating" are: non-volatile, density, VOC, heavy metals;
items examined with reference to HG/T4757-2014 agricultural machinery paint are: moisture and heat resistance, water resistance and artificial weather aging resistance;
the items examined with reference to HG/T5368-2018 polyaspartic acid ester anticorrosive paint were: pencil hardness, bend test, abrasion resistance, pot life;
items tested with reference to HG/T2454-2014 solvent-borne polyurethane coating (two-component) were: in the state of a dissolver, fineness, drying time, appearance of a paint film, gloss, impact resistance, a cross-cut test, adhesion (drawing method), acid resistance, alkali resistance, salt resistance and salt spray resistance.
The specific test results are shown in table 4 and table 5 below.
TABLE 4 Table 4
TABLE 5
As shown in the data in the table, the nonvolatile matter content in the high-solid DTM polyurethane coating provided by the invention is more than or equal to 80%, the initial viscosity of the coating prepared by mixing the component A and the component B is low, the viscosity increasing rate is low, the applicable period is more than 45min, the drying mode is self-drying, heating equipment is not needed, the drying time is fast, and the construction time can be greatly saved. Meanwhile, the adhesive force (drawing method) is more than or equal to 9, the adhesive force to the metal substrate is good, the gloss is full, the angle of 20 degrees is more than 90, and the decorative effect is good.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The high-solid-content DTM polyurethane coating is characterized by comprising an A component and a B component, wherein the A component comprises the following raw materials in percentage by mass: 30% -35% of polyaspartic acid ester, 18% -23% of modified resin, 1% -1.5% of dispersing agent, 0.2% -0.6% of defoaming agent, 0.3% -0.5% of leveling agent, 1% -1.5% of ultraviolet light absorber, 10% -20% of pigment, 20% -32% of filler, 3% -5% of molecular sieve and 8% -15% of solvent, wherein the component B is curing agent, and the mass of the component B is 25% -30% of the total mass of the component A;
the curing agent is a mixture of an HDI trimer and isophorone diisocyanate, wherein the mass ratio of the HDI trimer to the isophorone diisocyanate is 4-6:1, and the HDI trimer is Bayer N3900;
the modified resin is castor oil modified polyester polyol resin,
the preparation method specifically comprises the following steps:
step 1: after castor oil, diglycol and trimethylolpropane are uniformly mixed, heating to 215-225 ℃ in a protective atmosphere, and carrying out heat preservation reaction for 0.8-1.2 h;
step 2: after the reaction is completed, adipic acid and petroleum xylene are added after the temperature is reduced to below 180 ℃, after the mixture is heated and refluxed for 1.5 to 2 hours, the mixture is stirred and heated to 245 to 250 ℃, the temperature is kept for reaction until the acid value in the reaction system is less than or equal to 1mgKOH/g, the lattice viscosity is reduced to below 60 ℃ after the lattice viscosity is 8 to 11s/25 ℃, butyl acetate is added and the mixture is uniformly mixed, and the castor oil modified polyester polyol resin is obtained;
the mass ratio of castor oil, diethylene glycol, trimethylolpropane, adipic acid, petroleum xylene and butyl acetate in the preparation process is as follows: 60-62: 6-7: 2.5 to 3: 9-10: 14-16: 4 to 6.
2. The high solids DTM polyurethane coating of claim 1, wherein the solvent is a mixture of ethylene glycol butyl ether acetate and t-butyl acetate.
3. The high solids DTM polyurethane coating of claim 1, wherein the ultraviolet light absorber is a mixture of a benzotriazole-based ultraviolet light absorber and a hindered amine-based stabilizer.
4. The high solids DTM polyurethane coating of claim 1, wherein the dispersant is a high molecular weight block copolymer with pigment affinic groups.
5. The high solids DTM polyurethane coating of claim 1, wherein the leveling agent is a polyether modified dimethylsiloxane.
6. The high solids DTM polyurethane coating of claim 1, wherein the defoamer is a silicone-based defoamer.
7. The high solids DTM polyurethane coating of claim 1, wherein the filler is at least one of barium sulfate, talc, mica powder, and zinc sulfate; and/or
The pigment is rutile type titanium dioxide; and/or
The molecular sieve is a 4A molecular sieve.
8. The method for preparing the high-solid-content DTM polyurethane paint according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1: weighing the raw materials according to the formula amount, mixing the polyaspartic acid ester and the modified resin, sequentially adding a dispersing agent and a defoaming agent in a stirring state, and uniformly stirring at 500-600 r/min;
s2: the rotating speed is adjusted to 600-800 r/min, pigment and filler are added, then 800-1000 r/min is dispersed for 10-15 min, and then the mixture is ground until the fineness is less than or equal to 20 mu m;
s3: adding a leveling agent, an ultraviolet light absorber, a solvent and a molecular sieve, and stirring for 10-15 min at 600-800 r/min to obtain the component A;
s4: and weighing the curing agent according to the formula amount, stirring uniformly at 500-600 r/min to obtain the component B, and subpackaging the component A and the component B to obtain the high-solid-content DTM polyurethane coating.
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| CN112210279A (en) * | 2020-08-31 | 2021-01-12 | 江苏兰陵高分子材料有限公司 | High-solid-content low-viscosity polyaspartic ester primer-topcoat integrated coating suitable for high-pressure airless spraying and preparation method thereof |
| CN113583223A (en) * | 2021-08-19 | 2021-11-02 | 施贝化学(中国)有限公司 | Preparation of castor oil modified polyester polyol for polyurethane terrace |
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