CN110938356B - PU seal primer for wall panel and preparation method thereof - Google Patents
PU seal primer for wall panel and preparation method thereof Download PDFInfo
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- CN110938356B CN110938356B CN201911155166.XA CN201911155166A CN110938356B CN 110938356 B CN110938356 B CN 110938356B CN 201911155166 A CN201911155166 A CN 201911155166A CN 110938356 B CN110938356 B CN 110938356B
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
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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
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4063—Mixtures of compounds of group C08G18/62 with other macromolecular compounds
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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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4288—Polycondensates having carboxylic or carbonic ester groups in the main chain modified by higher fatty oils or their acids or by resin acids
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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
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6275—Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double 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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
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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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
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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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a PU seal primer for a wallboard, which comprises a main paint, a curing agent and a diluent, wherein the weight ratio of the main paint to the curing agent to the diluent is 1:1: (0.1-0.3), wherein the main paint is prepared from the following raw materials: alkyd resin, vinyl chloride-vinyl acetate resin, a defoaming agent, a leveling agent, xylene and ethyl acetate; the curing agent is prepared from the following raw materials: butyl acetate, xylene, hexamethylene diisocyanate trimer, aromatic polyisocyanate and diphenylmethane diisocyanate; the diluent consists of the following raw materials: butyl acetate, propylene glycol methyl ether acetate, xylene, ethyl acetate and dimethyl carbonate. The PU seal primer disclosed by the invention has excellent moisture resistance.
Description
Technical Field
The invention relates to the field of coatings, in particular to a PU seal primer for a wallboard and a preparation method thereof.
Background
The wall panel is a new material for decorating wall developed in recent years, and generally adopts wood and the like as a base material. The wall panel generally has the characteristics of light weight, fire resistance, moth resistance and simple and convenient construction, has good decorative effect and convenient maintenance, and can bring different feelings indoors. However, since the back surface of the panel is in contact with the wall for a long time, the primer on the back surface of the panel is prone to water seepage, cracking, falling off and the like in humid south weather.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, the invention proposes a PU basecoat sealer for siding panels, which has excellent moisture resistance.
The technical purpose of the invention is realized by the following technical scheme:
the PU seal primer for the wall panel comprises a main paint, a curing agent and a diluent, wherein the weight ratio of the main paint to the curing agent to the diluent is 1:1: (0.1-0.3), wherein the main paint is prepared from the following raw materials in parts by weight:
alkyd resin: 50-60 parts;
vinyl chloride-vinyl acetate copolymer: 12-15 parts;
defoaming agent: 0.1-0.2 parts;
leveling agent: 0.1-0.2 parts;
xylene: 5-15 parts of a solvent;
ethyl acetate: 5-15 parts of a solvent;
the curing agent is prepared from the following raw materials in parts by weight:
butyl acetate: 25-30 parts of a solvent;
xylene: 10-15 parts;
hexamethylene diisocyanate trimer: 10-15 parts of:
aromatic polyisocyanate: 25-30 parts of a solvent;
diphenylmethane diisocyanate: 15-20 parts of a solvent;
the diluent consists of the following raw materials in parts by weight:
butyl acetate: 25-45 parts of a solvent;
propylene glycol methyl ether acetate: 25-30 parts of a solvent;
xylene: 10-15 parts;
ethyl acetate: 10-15 parts;
dimethyl carbonate: 10-15 parts.
Preferably, the alkyd resin has a solid content of 60% to 80%.
Preferably, the solid content of the vinyl chloride-vinyl acetate copolymer is 80-100%.
Preferably, the defoaming agent is at least one of BYK-085, BYK-088 and BYK-141.
Further preferably, the defoaming agent is at least one of BYK-088 and BYK-141.
Preferably, the leveling agent is at least one of EFKA-3033, EFKA-3580 and EFKA-3600.
Further preferably, the leveling agent is at least one of EFKA-3033 and EFKA-3580.
Preferably, the construction viscosity of the PU sealing primer for the wall panel is 10-12s of rock field NK-2 cup viscosity.
Preferably, the viscosity of the main paint is as follows: 1000. + -. 500CPS/30 ℃.
Another object of the present invention is to provide a method for preparing the PU basecoat for siding, which comprises the following steps:
a method of preparing a PU basecoat sealer for siding as described above, comprising the steps of:
(1) preparing a main paint: uniformly stirring alkyd resin, vinyl chloride-vinyl acetate resin, a defoaming agent, a flatting agent, xylene and ethyl acetate;
(2) preparation of a curing agent: uniformly stirring butyl acetate, dimethylbenzene, hexamethylene diisocyanate tripolymer, aromatic polyisocyanate and diphenylmethane diisocyanate, and filtering;
(3) preparing a diluent: uniformly stirring butyl acetate, propylene glycol methyl ether acetate, xylene, ethyl acetate and dimethyl carbonate, and filtering;
(4) when in use, the main paint, the curing agent and the diluent are mixed.
The invention has the beneficial effects that: after being coated on the wall panel, the PU sealing primer disclosed by the invention has excellent moisture resistance, and can meet the construction requirement in the humid weather in the south.
(1) The alkyd resin is used as a main component in the main paint in the paint system, so that the paint system has excellent water resistance, and the alkyd resin and hexamethylene diisocyanate trimer, aromatic polyisocyanate and diphenylmethane diisocyanate in the paint system have a synergistic effect, are crosslinked and cured during film formation, and synergistically improve the water resistance, so that the moisture resistance is improved;
(2) the paint system of the invention takes the vinyl chloride-vinyl acetate copolymer as an auxiliary component in the main paint, the vinyl chloride-vinyl acetate copolymer can further improve the water resistance of the main paint after being mixed with the alkyd resin, and then the vinyl chloride-vinyl acetate copolymer can be cured into a film with the cooperation of hexamethylene diisocyanate trimer, aromatic polyisocyanate and diphenylmethane diisocyanate, and simultaneously the vinyl chloride-vinyl acetate copolymer can synergistically improve the seepage resistance of film molecules of the paint film, further enhance the toughness and the anti-dropping property of the paint film, and effectively improve the adhesive force between the film molecules and the wall panel, thereby ensuring that the wall panel can be normally used for a long time in the wet weather in the south.
Detailed Description
Examples 1 to 4:
a PU seal primer for wall panels, which is prepared by the following method:
(1) preparing a main paint: selecting a clean dispersion cylinder meeting the standard, sequentially adding alkyd resin, vinyl chloride-vinyl acetate resin, a defoaming agent, a flatting agent, xylene and ethyl acetate materials, starting a dispersion machine, and dispersing at a low speed of 600-800 r/min, wherein the viscosity is as follows: 1000 +/-500 CPS/30 ℃;
(2) preparation of a curing agent: selecting a clean dispersion cylinder meeting the standard, sequentially adding butyl acetate, xylene, Bayer L-75, Bayer 1451 and Sabbis MD70AE materials, starting a dispersion machine, dispersing for 30 minutes at 600-800 r/min, keeping the temperature at 70 ℃, cooling to 25 ℃, discharging and sealing; filtering with 200 mesh screen and barreling for use;
(3) preparing a diluent: selecting a clean dispersion cylinder meeting the standard, sequentially adding butyl acetate, propylene glycol monomethyl ether acetate, xylene, ethyl acetate and dimethyl carbonate, starting a dispersion machine, and dispersing for 15 minutes at 600-800 r/min. Filtering with 200 mesh screen and barreling for use;
(4) when in use, the main paint, the curing agent and the diluent are mixed according to the mass ratio of 1:1: (0.1-0.3) mixing.
The reagents used in examples 1-4 are all commercially available, wherein:
alkyd resin: the product with the mark of 3401-X-70-3, which is produced by Changxing materials industries, Ltd, has the solid content of 69-71 percent;
vinyl chloride-vinyl acetate copolymer: the product with the brand number of VINN0222/48A produced by Guangzhou Huanju chemical Limited company has the solid content of 100 percent;
defoaming agent: BYK-141;
leveling agent: EFKA-3033;
bayer L-75: the main component of the product produced by the scientific union (China) GmbH is hexamethylene diisocyanate trimer;
bayer 1451: the product produced by Corsai Chuanghe (China) Limited company mainly comprises aromatic polyisocyanate;
sbis MD70 AE: the main component of the product produced by Zhuhaisbiss chemical company Limited is diphenylmethane diisocyanate.
The amounts of the main paint, the curing agent and the diluent in the PU seal primer of examples 1-4 are shown in table 1;
the mass ratios of the main paint, the curing agent and the diluent in the PU seal primers of examples 1 to 4 are shown in table 2.
Table 1: each component in the PU seal coat of examples 1 to 4 was used in the amount (parts by weight)
Table 2: examples 1 to 4 of the PU seal primer composition, the ratio by mass of the main paint, the curing agent and the diluent
The paint prepared in the examples 1-4 is sprayed on the surface of a wood board according to the construction viscosity of 10-12s in a rock field NK-2 cup viscosity, after the paint is dried and solidified into a film, the wood board is soaked in water (normal temperature) for 8 hours, then the wood board is taken out and naturally dried for 4 hours, 12 hours is a set of simulated moisture tests, the cycle is repeated, the test is finished until the paint surface is cracked and peeled by naked eyes, and the test results are shown in Table 3:
table 3: examples 1 to 4 simulation test results on wetting
Item | Example 1 | Example 2 | Example 3 | Example 4 |
Number of cycles | 72 | 70 | 92 | 75 |
Cycle time (h) | 864 | 840 | 1104 | 900 |
As can be seen from Table 3, the PU seal primer can simulate damp test cycle more than 70 times (up to 92 times), can simulate damp test to reach 800 hours without paint surface falling off (up to 1104 hours), and is an extreme condition, and normal use is at least more than one hundred times of the time, which shows that the PU seal primer has excellent water-resistant and moisture-proof capability.
Comparative examples 1 to 5:
comparative example 1 is a commercially available PU basecoat sealer of the same type.
Compared with the example 3, the preparation methods and the mixing processes of the comparative examples 2 to 5 are the same, and the difference is that the dosage of the reagents is different, the dosage of each component in the main paint, the curing agent and the diluent in the PU seal primer of the comparative examples 2 to 5 is shown in the table 4, and the mixing mass ratio of the main paint, the curing agent and the diluent is 1:1: 0.2.
Table 4: dosage of PU seal coat in comparative examples 2 to 5 (parts by weight)
The paint prepared in the comparative example 1 and the comparative examples 2-6 is sprayed on the surface of a wood board according to the construction viscosity of 10-12s of rock NK-2 cup viscosity, after the paint is dried and solidified into a film, the wood board is soaked in water (normal temperature) for 8 hours, then the wood board is taken out and naturally dried for 4 hours, 12 hours is a group of simulated moisture tests, the test is finished until the paint surface begins to crack and fall off by naked eyes, and the test results are shown in Table 5:
table 5: comparative examples 1-5 simulated moisture test results
As can be seen from Table 5, the comparison example 3 and the comparison example 1 show that the moisture resistance of the PU sealing primer is far better than that of the same type of products sold in the market, the service time of a simulated moisture test is more than 3 times that of the same type of products sold in the market, and the service life of the PU sealing primer is more than 3 times that of the same type of products sold in the market when the PU sealing primer is used in a humid environment;
as can be seen from comparative example 3 and comparative examples 2 to 4, when hexamethylene diisocyanate trimer (Bayer L-75), aromatic polyisocyanate (Bayer 1451) and diphenylmethane diisocyanate (Sabbis MD70AE) were simultaneously present in the paint system while the other components in the paint system were unchanged, the moisture-proof and anti-peeling abilities of the paint film were superior to the paint film in which the paint system contained only two of hexamethylene diisocyanate trimer (Bayer L-75), aromatic polyisocyanate (Bayer 1451) and diphenylmethane diisocyanate (Sabbis MD70AE), indicating that these three substances simultaneously act synergistically with the main paint;
comparative example 3 and comparative examples 2 to 4 show that, when the other components in the paint mixture were unchanged and both of the vinyl chloride-vinyl acetate, the trimer of hexamethylene diisocyanate (Bayer L-75), the aromatic polyisocyanate (Bayer 1451) and the diphenylmethane diisocyanate (Sakiss MD70AE) were present in the paint mixture, the moisture-proof and peel-off-resistant properties of the paint film were better than those of the paint mixture in which only the trimer of hexamethylene diisocyanate (Bayer L-75), the aromatic polyisocyanate (Bayer 1451) and the diphenylmethane diisocyanate (Sakiss MD70AE) were present, indicating that the vinyl chloride-vinyl acetate, the trimer of hexamethylene diisocyanate (Bayer L-75), the aromatic polyisocyanate (Bayer 1451) and the diphenylmethane diisocyanate (Sakiss MD70AE) act synergistically in the paint mixture, the moisture-proof and anti-falling capacity of the paint film is improved together.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A PU seal coat for a panel, characterized in that: the paint comprises a main paint, a curing agent and a diluent, wherein the weight ratio of the main paint to the curing agent to the diluent is 1:1: (0.1-0.3), wherein the main paint is prepared from the following raw materials in parts by weight:
alkyd resin: 50-60 parts;
vinyl chloride-vinyl acetate copolymer: 12-15 parts;
defoaming agent: 0.1-0.2 parts;
leveling agent: 0.1-0.2 parts;
xylene: 5-15 parts of a solvent;
ethyl acetate: 5-15 parts of a solvent;
the curing agent is prepared from the following raw materials in parts by weight:
butyl acetate: 25-30 parts of a solvent;
xylene: 10-15 parts;
hexamethylene diisocyanate trimer: 10-15 parts of:
aromatic polyisocyanate: 25-30 parts of a solvent;
diphenylmethane diisocyanate: 15-20 parts of a solvent;
the diluent consists of the following raw materials in parts by weight:
butyl acetate: 25-45 parts of a solvent;
propylene glycol methyl ether acetate: 25-30 parts of a solvent;
xylene: 10-15 parts;
ethyl acetate: 10-15 parts;
dimethyl carbonate: 10-15 parts;
the alkyd resin is a product with the mark of 3401-X-70-3 produced by Changxing materials industries, Ltd, the solid content of the vinyl chloride-vinyl acetate copolymer is 80-100%, and the aromatic polyisocyanate is Bayer 1451.
2. A PU basecoat for use in siding according to claim 1, wherein: the defoaming agent is at least one of BYK-085, BYK-088 and BYK-141.
3. A PU basecoat for use in siding according to claim 1, wherein: the leveling agent is at least one of EFKA-3033, EFKA-3580 and EFKA-3600.
4. A PU basecoat for use in siding according to claim 1, wherein: the construction viscosity of the PU sealing primer for the wall panel is 10-12s of rock field NK-2 cup viscosity.
5. A PU basecoat for use in siding according to claim 1, wherein: the viscosity of the main paint is as follows: 1000. + -. 500CPS/30 ℃.
6. A method of preparing the PU shop primer for siding according to any of claims 1 to 5, wherein: the method comprises the following steps:
(1) preparing a main paint: uniformly stirring alkyd resin, vinyl chloride-vinyl acetate resin, a defoaming agent, a flatting agent, xylene and ethyl acetate;
(2) preparation of a curing agent: uniformly stirring butyl acetate, dimethylbenzene, hexamethylene diisocyanate tripolymer, aromatic polyisocyanate and diphenylmethane diisocyanate, and filtering;
(3) preparing a diluent: uniformly stirring butyl acetate, propylene glycol methyl ether acetate, xylene, ethyl acetate and dimethyl carbonate, and filtering;
(4) when in use, the main paint, the curing agent and the diluent are mixed.
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