Solvent-based high-molecular nano heat-insulating color finish paint and preparation method thereof

Abstract

The invention relates to the technical field of coating preparation, and particularly discloses a solvent type high-molecular nano heat-insulating colored finishing paint and a preparation method thereof. The coating is prepared from 50-70 parts of high-molecular thermoplastic acrylic resin, 2-15 parts of a nano material, 5-10 parts of n-butyl acetate, 5-10 parts of xylene, 5-10 parts of propylene glycol methyl ether acetate or ethylene glycol monoethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 1-30 parts of pigment, 0-8 parts of cellulose acetate, 0.1-5 parts of a flatting agent, 1-10 parts of a dispersing agent and 0.5-1 part of an adhesion promoter. The paint product is high in heat insulation rate, easy to color, free of flooding, easy to construct, high in construction efficiency, good in surface effect and good in weather resistance, a series of finish paint which is bright in color, free of flooding, easy to color and good in weather resistance can be achieved, heat outside a vehicle is prevented from being transmitted into the vehicle, the influence of the temperature outside the vehicle on the temperature inside the vehicle is reduced, and the service life of the vehicle is prolonged. And the spraying device can be widely applied to spraying of vehicle bodies of original factories, and the construction efficiency is very high.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle polymer coating preparation, in particular to a vehicle solvent-based polymer nano heat-insulating color topcoat and a preparation method thereof. Background Art

[0002] As early as December 3, 2015, our company was authorized to obtain the invention patent of "a kind of paint for vehicles", with the patent number "ZL201310218567.1". Through this patented technology, we can produce a series of topcoats of various colors for vehicles with thermoplastic acrylic resin as the main film-forming substance, adding leveling agent, dispersant, pigment, and organic solvents such as n-butyl acetate and xylene. These topcoats can be prepared in different proportions to obtain topcoats of various colors for different vehicles, and by spraying with a spray gun, a bright coating can be obtained on the vehicle body.

[0003] Before the invention of this technology, vehicle paint only has the function of anti-corrosion for vehicle sheet metal and beautification of the vehicle. With the rise and popularization of new energy vehicles, energy is an important source of power for various vehicles, and energy consumption is crucial. Whether it is a pure electric vehicle (BEV), a hybrid electric vehicle (HEV) or a fuel cell vehicle (FCEV), energy consumption determines the range of new energy vehicles, and even more determines human protection of the atmosphere and the environment.

[0004] Tests have shown that when a car is exposed to the sun for a long time at a high temperature of 40°C outdoors, the temperature inside the car is above 70 degrees and can reach up to 90 degrees. At this time, after starting the vehicle, it is necessary to use air conditioning to cool the temperature inside the car. In this cooling process, a lot of energy is needed for cooling. In summer, when the vehicle is driving under the scorching sun, a lot of energy is also needed to cool the car so that passengers can ride in a comfortable temperature. When the vehicle is exposed outdoors, it is not only the problem of high temperature inside the car, but also many plastic parts and circuits inside and outside the car will accelerate aging. If it continues for a long time, it will cause serious damage to the vehicle, reduce the service life of the vehicle, and also threaten the personal safety of the passengers.

[0005] At present, all vehicles require a lot of electricity for air conditioning and cooling. The outdoor temperature and the temperature setting inside the car directly determine the amount of electricity consumed. Now many electric vehicles consume 1%-5% of the battery power per hour (different manufacturers have different consumption). Turning on the air conditioner in a gasoline vehicle will also increase the consumption of gasoline or diesel, which means that turning on the air conditioner will reduce the vehicle's range and increase the vehicle's energy consumption. How to effectively block the heat outside the car from being transferred to the inside of the car through the body coating is a technology that is worth studying.

[0006] In order to solve the above problems, the car body can be coated with a heat-insulating topcoat when it leaves the factory or is repaired, which can block the heat outside the car from being transferred into the car, reduce the impact of the outside temperature on the temperature inside the car, and make the temperature inside the car rise slightly or not rise at all, which will inevitably save the consumption of electricity, extend the vehicle's cruising range, achieve energy conservation and emission reduction, and protect the atmosphere and environment. At the same time, it can also extend the service life of the vehicle and indirectly protect the lives of passengers. After years of research and development, our company has developed a solvent-based polymer nano-insulating color topcoat for vehicles and its preparation method, and at the same time transformed the preparation method into a series of nano-insulating topcoat products for vehicles, which effectively solves and reduces the problem of energy consumption of vehicle air conditioning. Summary of the invention

[0007] The purpose of the present invention is to provide a solvent-based polymer nano thermal insulation color topcoat for vehicles and a preparation method thereof to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following materials in parts by weight: 50-70 parts of polymer thermoplastic acrylic resin, 2-15 parts of nanomaterials, 5-10 parts of n-butyl acetate, 5-10 parts of xylene, 5-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 1-30 parts of pigment, 0-8 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-10 parts of dispersant and 0.5-1 parts of adhesion promoter.

[0009] As a further scheme of the present invention: the following materials are included in parts by weight: 55-75 parts of high molecular thermoplastic acrylic resin, 2-12 parts of nanomaterials, 1-5 parts of n-butyl acetate, 1-5 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 0-5 parts of methyl isobutyl ketone, 0-5 parts of dibasic acid ester, 2-20 parts of pigment, 1-5 parts of cellulose acetate, 0.1-3 parts of leveling agent, 1-10 parts of dispersant, and 0.5-2 parts of adhesion promoter.

[0010] As a further scheme of the present invention: it includes the following materials in parts by weight: 60-80 parts of high molecular thermoplastic acrylic resin, 2-10 parts of nanomaterials, 1-10 parts of n-butyl acetate, 1-10 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-10 parts of methyl isobutyl ketone, 1-5 parts of divalent acid ester, 3-15 parts of pigment, 2-10 parts of cellulose acetate, 0.1-5 parts of leveling agent, 2-12 parts of dispersant, and 0.2-3 parts of adhesion promoter.

[0011] As a further scheme of the present invention: it includes the following materials in parts by weight: 40-80 parts of high molecular thermoplastic acrylic resin, 1-10 parts of nanomaterials, 1-15 parts of n-butyl acetate, 1-15 parts of xylene, 2-12 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 2-10 parts of dibasic acid ester, 1-30 parts of pigment, 1-15 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-15 parts of dispersant, and 0.1-5 parts of adhesion promoter.

[0012] As a further solution of the present invention: the high molecular thermoplastic acrylic resin is a thermoplastic acrylic resin with a solid content of 50-70%, a hydroxyl value ≤2.0, an acid value ≤7, a drying temperature of the resin at 5-180°C, a baking drying time of less than 3 minutes, and can be any model of any manufacturer.

[0013] As a further solution of the present invention: the nanomaterial is modified ATO nano-slurry, nano-ITO dispersion, nano-ATO dispersion, nano-ITO, nano-GTO insulation powder, nano-zirconium oxide, nano-AZO, silica aerogel powder or silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25°C) of 0.001 to 3W / (m·K) and a particle size of 0.1 to 20μm.

[0014] As a further solution of the present invention: the purity of n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone, and dibasic acid ester is ≥99.5%, and the water content is ≤500ppm, and they can be products of any manufacturer.

[0015] As a further embodiment of the present invention: the pigment is an organic pigment and an inorganic pigment, and the pigment can be titanium dioxide or light-fast yellow or isoindoline yellow or cadmium yellow or medium chrome yellow or iron oxide yellow or toluidine red or iron oxide red or phthalocyanine blue or indanthrene blue or phthalocyanine green or carbon black or silver powder or mica pearl powder or purple, etc.

[0016] As a further solution of the present invention: the cellulose acetate is selected from CAB381-0.5, CAB381-2, and CAB381-20. It can be a single variety of the above three CABs, or a combination of two or three in any proportion.

[0017] As a further solution of the present invention: the leveling agent is an organic silicon leveling agent, an acrylate leveling agent, or a fluorine-modified leveling agent, which can be any one of them, or a combination of any two or any three of them in any proportion.

[0018] As a further solution of the present invention: the dispersant is selected from anionic wetting and dispersing agents, nonionic wetting and dispersing agents, electrically neutral wetting and dispersing agents, or polymeric super dispersants according to the type of pigment selected.

[0019] As a further solution of the present invention: the adhesion promoter is a silane coupling agent, which has good compatibility with the selected thermoplastic acrylic resin, and the product can be of any model from any manufacturer.

[0020] The method for preparing the solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following steps:

[0021] S1. Select the solvent raw materials according to the components and test each material to ensure it meets the standards;

[0022] S2, weighing a high molecular thermoplastic acrylic resin by weight and slowly adding it into a container, and slowly adding various solvents, dispersants, leveling agents, cellulose acetate, and adhesion promoters under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10-20min, and slowly adding pigments under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10min; obtaining a mixed color paste;

[0023] Note: In this step, 20% by weight of high molecular thermoplastic acrylic resin and 20% by weight of n-butyl acetate and xylene should be reserved, 15% by weight of high molecular thermoplastic acrylic resin and 15% by weight of n-butyl acetate and xylene should be used to clean the sand mill, and the remaining 5% by weight of high molecular thermoplastic acrylic resin and 5% by weight of n-butyl acetate and xylene should be used to adjust the viscosity of the nano color paste mixture.

[0024] S3. Grind the mixed color paste obtained in S2 with a sand mill. Use a fineness meter to check the fineness after each grinding. Stop grinding when the fineness of the mixed color paste is ≤20μm. Weigh the mixed color paste and make up the solvent lost during the grinding process with xylene.

[0025] S4. Use an explosion-proof disperser to disperse the color paste with qualified fineness at a speed of 200-300r / min. While stirring, slowly add the nanomaterial, gradually increase the dispersion speed to 800r / min, and disperse for 30 minutes to obtain a nano color paste mixture.

[0026] The various indicators of the nano-color paste mixture prepared by S5 and S4 are tested. During the test, if the fineness is unqualified, it is quickly ground again with a sand mill until the fineness is qualified. When the viscosity is higher than 202s, add an appropriate amount of n-butyl acetate and xylene reserved in S2 to lower it. When the viscosity is less than 198s, add the high molecular thermoplastic acrylic resin reserved in S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the 4 cups of coating itself are also required to be 25℃±1. When the indoor temperature is higher than 26℃, the 4 cups of coating need to be cooled with a refrigerator or ice cubes. When the indoor temperature is less than 24℃, the 4 cups of coating need to be heated in an oven. See the table below for specific indicators:

[0027]

[0028]

[0029] S6. Filter the qualified nano-color paste mixture with a 200-mesh filter cloth.

[0030] The above-mentioned solvent-based polymer nano thermal insulation topcoat of various colors for vehicles is used in the field of coating preparation.

[0031] Compared with the prior art, the invention has the following beneficial effects: the invention uses polymer solvent-based thermoplastic acrylic resin as the main material, and by adding nanomaterials, various solvents, different pigments, dispersants, leveling agents, cellulose acetate, and adhesion promoters, a series of topcoats with high heat insulation rate, good leveling, bright colors, no floating color, easy color adjustment, and good weather resistance can be prepared, which can block the heat outside the vehicle from being transferred to the vehicle, reduce the influence of the temperature outside the vehicle on the temperature inside the vehicle, make the temperature inside the vehicle rise slightly or not, reduce the temperature inside the vehicle, save electricity, increase the vehicle's cruising range, achieve energy conservation and emission reduction, and improve the protection of the atmosphere and the environment. At the same time, it can extend the service life of the vehicle and indirectly protect the life safety of the passengers. The product has high heat insulation rate, easy color adjustment, no floating color, easy construction, high construction efficiency, good surface effect, and good weather resistance. It can be widely used in the spraying of original vehicle bodies, and can be dried at room temperature for 10-15 minutes, or can be baked at 120-180°C for 2-5 minutes to dry, and the construction efficiency is very high. DETAILED DESCRIPTION

[0032] In order to make the public better understand the present invention, the technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0033] Implementation Example 1

[0034] A preparation method for a solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following materials in parts by weight: 50-70 parts of polymer thermoplastic acrylic resin, 2-15 parts of nanomaterials, 5-10 parts of n-butyl acetate, 5-10 parts of xylene, 5-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 1-30 parts of pigment, 0-8 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-10 parts of dispersant and 0.5-1 parts of adhesion promoter.

[0035] Specifically, in this embodiment, the polymer thermoplastic acrylic resin is a thermoplastic acrylic resin with a solid content of 50-70%, a hydroxyl value ≤ 2.0, an acid value ≤ 7, a drying temperature of 5-180°C, and a baking drying time of less than 3 minutes; it can be imported or domestic;

[0036] Specifically, in this embodiment, the nanomaterial is a modified ATO nano-slurry, a nano-ITO dispersion, a nano-ATO dispersion, a nano-ITO, a nano-GTO thermal insulation powder, a nano-zirconium oxide, a nano-AZO, a silica aerogel powder or a silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25° C.) of 0.001 to 3 W / (m·K) and a particle size of 0.1 to 20 μm.

[0037] Specifically, in this embodiment, the purity of the n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone, and dibasic acid ester is ≥99.5%, and the water content is ≤500ppm, and they can be products of any manufacturer;

[0038] Specifically, in this embodiment, the pigment is an organic pigment and an inorganic pigment, and the pigment can be titanium dioxide or light-fast yellow or isoindoline yellow or cadmium yellow or medium chrome yellow or iron oxide yellow or toluidine red or iron oxide red or phthalocyanine blue or indanthrene blue or phthalocyanine green or carbon black or silver powder or mica pearl powder or purple, etc.

[0039] Specifically, in this embodiment, the cellulose acetate is CAB381-0.5, CAB381-2, or CAB381-20;

[0040] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, an acrylate leveling agent, a fluorine-modified leveling agent, and products of manufacturers such as BYK, BASF, and Axal can be used;

[0041] Specifically, in this embodiment, the dispersant is an anionic wetting dispersant, a nonionic wetting dispersant, an electrically neutral wetting dispersant, or a polymeric super dispersant, and the manufacturer is not limited;

[0042] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, which has good compatibility with the selected thermoplastic acrylic resin, and the product can be any model from any manufacturer;

[0043] Implementation Example 2

[0044] A preparation method for a solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following materials in parts by weight: 55-75 parts of polymer thermoplastic acrylic resin, 2-12 parts of nanomaterials, 1-5 parts of n-butyl acetate, 1-5 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 0-5 parts of methyl isobutyl ketone, 0-5 parts of dibasic acid ester, 2-20 parts of pigment, 1-5 parts of cellulose acetate, 0.1-3 parts of leveling agent, 1-10 parts of dispersant and 0.5-2 parts of adhesion promoter.

[0045] Specifically, in this embodiment, the polymer thermoplastic acrylic resin is a thermoplastic acrylic resin with a solid content of 50-70%, a hydroxyl value ≤ 2.0, an acid value ≤ 7, a drying temperature of 5-180°C, and a baking drying time of less than 3 minutes; it can be imported or domestic;

[0046] Specifically, in this embodiment, the nanomaterial is a modified ATO nano-slurry, a nano-ITO dispersion, a nano-ATO dispersion, a nano-ITO, a nano-GTO thermal insulation powder, a nano-zirconium oxide, a nano-AZO, a silica aerogel powder or a silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25° C.) of 0.001 to 3 W / (m·K) and a particle size of 0.1 to 20 μm.

[0047] Specifically, in this embodiment, the purity of the n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone, and dibasic acid ester is ≥99.5%, and the water content is ≤500ppm, and they can be products of any manufacturer;

[0048] Specifically, in the present embodiment, the pigment is yellow pigment such as 81# yellow, 83# yellow, lemon yellow, 2900 medium chrome yellow, iron oxide yellow, etc., or rutile titanium dioxide pigment, or green pigment such as phthalocyanine green, or high-pigment or low-pigment carbon black pigment, or red pigment such as Lithol Red, Pigment Red 179, Pigment Red 122, or iron oxide red, or phthalocyanine blue pigment such as 15:3, 15:1, or 15:4, or aluminum silver paste pigment such as non-leafing silver or silver flash, or colored aluminum silver paste pigment, or colored mica pigment such as white, red, blue, green, or purple;

[0049] Specifically, in this embodiment, the cellulose acetate is CAB381-0.5, CAB381-2, CAB381-20, or CAB551-0.2;

[0050] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, an acrylate leveling agent, a fluorine-modified leveling agent, and can be products of manufacturers such as BYK, BASF, and Axalta, or can be products of domestic manufacturers;

[0051] Specifically, in this embodiment, the dispersant is an anionic wetting dispersant or a nonionic wetting dispersant or an electrically neutral wetting dispersant or a polymeric super dispersant, and can be a product of an imported manufacturer such as Efka, BYK, BASF, or a product of a domestic manufacturer;

[0052] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, which has good compatibility with the selected thermoplastic acrylic resin, and the product can be any model from any manufacturer;

[0053] Implementation Example 3

[0054] A preparation method for a solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following materials in parts by weight: 60-80 parts of polymer thermoplastic acrylic resin, 2-10 parts of nanomaterials, 1-10 parts of n-butyl acetate, 1-10 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-10 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 3-15 parts of pigment, 2-10 parts of cellulose acetate, 0.1-5 parts of leveling agent, 2-12 parts of dispersant and 0.2-3 parts of adhesion promoter.

[0055] Specifically, in this embodiment, the polymer thermoplastic acrylic resin is a thermoplastic acrylic resin with a solid content of 50-70%, a hydroxyl value ≤ 2.0, an acid value ≤ 7, a drying temperature of 5-180°C, and a baking drying time of less than 3 minutes; it can be imported or domestic;

[0056] Specifically, in this embodiment, the nanomaterial is a modified ATO nano-slurry, a nano-ITO dispersion, a nano-ATO dispersion, a nano-ITO, a nano-GTO thermal insulation powder, a nano-zirconium oxide, a nano-AZO, a silica aerogel powder or a silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25° C.) of 0.001 to 3 W / (m·K) and a particle size of 0.1 to 20 μm.

[0057] Specifically, in this embodiment, the purity of the n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone, and dibasic acid ester is ≥99.5%, and the water content is ≤500ppm, and they can be products of any manufacturer;

[0058] Specifically, in the present embodiment, the pigment is yellow pigment such as 81# yellow, 83# yellow, lemon yellow, 2900 medium chrome yellow, iron oxide yellow, etc., or rutile titanium dioxide pigment, or green pigment such as phthalocyanine green, or high-pigment or low-pigment carbon black pigment, or red pigment such as Lithol Red, Pigment Red 179, Pigment Red 122, or iron oxide red, or phthalocyanine blue pigment such as 15:3, 15:1, or 15:4, or aluminum silver paste pigment such as non-leafing silver or silver flash, or colored aluminum silver paste pigment, or colored mica pigment such as white, red, blue, green, or purple;

[0059] Specifically, in this embodiment, the cellulose acetate is CAB381-0.5, CAB381-2, CAB381-20, or CAB551-0.2;

[0060] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, an acrylate leveling agent, a fluorine-modified leveling agent, and can be products of manufacturers such as BYK, BASF, and Axalta, or can be products of domestic manufacturers;

[0061] Specifically, in this embodiment, the dispersant is an anionic wetting dispersant or a nonionic wetting dispersant or an electrically neutral wetting dispersant or a polymeric super dispersant, and can be a product of an imported manufacturer such as Efka, BYK, BASF, or a product of a domestic manufacturer;

[0062] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, which has good compatibility with the selected thermoplastic acrylic resin, and the product can be any model from any manufacturer;

[0063] Implementation Example 4

[0064] A preparation method for a solvent-based polymer nano thermal insulation color topcoat for vehicles comprises the following materials in parts by weight: 40-80 parts of polymer thermoplastic acrylic resin, 1-10 parts of nanomaterials, 1-15 parts of n-butyl acetate, 1-15 parts of xylene, 2-12 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 2-10 parts of dibasic acid ester, 1-30 parts of pigment, 1-15 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-15 parts of dispersant and 0.1-5 parts of adhesion promoter.

[0065] Specifically, in this embodiment, the polymer thermoplastic acrylic resin is a thermoplastic acrylic resin with a solid content of 50-70%, a hydroxyl value ≤ 2.0, an acid value ≤ 7, a drying temperature of 5-180°C, and a baking drying time of less than 3 minutes; it can be imported or domestic;

[0066] Specifically, in this embodiment, the nanomaterial is a modified ATO nano-slurry, a nano-ITO dispersion, a nano-ATO dispersion, a nano-ITO, a nano-GTO thermal insulation powder, a nano-zirconium oxide, a nano-AZO, a silica aerogel powder or a silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25° C.) of 0.001 to 3 W / (m·K) and a particle size of 0.1 to 20 μm.

[0067] Specifically, in this embodiment, the purity of the n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone, and dibasic acid ester is ≥99.5%, and the water content is ≤500ppm, and they can be products of any manufacturer;

[0068] Specifically, in the present embodiment, the pigment is yellow pigment such as 81# yellow, 83# yellow, lemon yellow, 2900 medium chrome yellow, iron oxide yellow, etc., or rutile titanium dioxide pigment, or green pigment such as phthalocyanine green, or high-pigment or low-pigment carbon black pigment, or red pigment such as Lithol Red, Pigment Red 179, Pigment Red 122, or iron oxide red, or phthalocyanine blue pigment such as 15:3, 15:1, or 15:4, or aluminum silver paste pigment such as non-leafing silver or silver flash, or colored aluminum silver paste pigment, or colored mica pigment such as white, red, blue, green, or purple;

[0069] Specifically, in this embodiment, the cellulose acetate is CAB381-0.5, CAB381-2, CAB381-20, or CAB551-0.2;

[0070] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, an acrylate leveling agent, a fluorine-modified leveling agent, and can be products of manufacturers such as BYK, BASF, and Axalta, or can be products of domestic manufacturers;

[0071] Specifically, in this embodiment, the dispersant is an anionic wetting dispersant or a nonionic wetting dispersant or an electrically neutral wetting dispersant or a polymeric super dispersant, and can be a product of an imported manufacturer such as Efka, BYK, BASF, or a product of a domestic manufacturer;

[0072] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, which has good compatibility with the selected thermoplastic acrylic resin, and the product can be any model from any manufacturer;

[0073] The method for preparing a solvent-based polymer nano thermal insulation color topcoat for a vehicle in the above embodiment further comprises the following steps:

[0074] S1. Select the solvent raw materials according to the components and test each material to ensure it meets the standards;

[0075] S2, weighing a high molecular thermoplastic acrylic resin by weight and slowly adding it into a container, and slowly adding various solvents, dispersants, leveling agents, cellulose acetate, and adhesion promoters under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10-20min, and slowly adding pigments under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10min; obtaining a mixed color paste;

[0076] Note: In this step, 20% by weight of high molecular thermoplastic acrylic resin and 20% by weight of n-butyl acetate and xylene should be reserved, 15% by weight of high molecular thermoplastic acrylic resin and 15% by weight of n-butyl acetate and xylene should be used to clean the sand mill, and the remaining 5% by weight of high molecular thermoplastic acrylic resin and 5% by weight of n-butyl acetate and xylene should be used to adjust the viscosity of the nano color paste mixture.

[0077] S3. Grind the mixed color paste obtained in S2 with a sand mill. Use a fineness meter to check the fineness after each grinding. Stop grinding when the fineness of the mixed color paste is ≤20μm. Weigh the mixed color paste and make up the solvent lost during the grinding process with xylene.

[0078] S4. Use an explosion-proof disperser to disperse the color paste with qualified fineness at a speed of 200-300r / min. While stirring, slowly add the nanomaterial, gradually increase the dispersion speed to 800r / min, and disperse for 30 minutes to obtain a nano color paste mixture.

[0079] The various indicators of the nano-color paste mixture prepared by S5 and S4 are tested. During the test, if the fineness is unqualified, it is quickly ground again with a sand mill until the fineness is qualified. When the viscosity is higher than 202s, add an appropriate amount of n-butyl acetate and xylene reserved in S2 to lower it. When the viscosity is less than 198s, add the high molecular thermoplastic acrylic resin reserved in S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the 4 cups of coating itself are also required to be 25℃±1. When the indoor temperature is higher than 26℃, the 4 cups of coating need to be cooled with a refrigerator or ice cubes. When the indoor temperature is less than 24℃, the 4 cups of coating need to be heated in an oven. See the table below for specific indicators:

[0080]

[0081] S6. Filter the qualified nano-color paste mixture with a 200-mesh filter cloth.

[0082] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0083] The above-mentioned solvent-based polymer nano thermal insulation color topcoat for vehicles is suitable for application or use in the field of coating preparation.

[0084] In addition, compared with the various color topcoats used for vehicles in the prior art, the key is to use nanomaterials with low thermal conductivity, which can effectively block the increase in the temperature inside the vehicle caused by the external heat of the vehicle, reduce the temperature inside the vehicle, and reduce the energy consumption of air conditioning, which can greatly increase the vehicle's mileage, save energy and reduce emissions, and improve the protection of the atmosphere and the environment. At the same time, it can extend the service life of the vehicle and indirectly protect the life safety of passengers. The product has high thermal insulation rate, easy color adjustment, no floating color, easy construction, high construction efficiency, good surface effect, and good weather resistance. It can be widely used in original vehicle body spraying and vehicle after-sales body repair.

[0085] The comparison of the external and internal temperatures of vehicles after various color topcoat products prepared by a method for preparing a solvent-based polymer nano thermal insulation color topcoat for vehicles are sprayed on the vehicle body surface and after various color topcoat products for vehicles are sprayed on the vehicle body surface is as follows:

[0086]

[0087] It can be seen from the above table that the use of the solvent-based polymer nano thermal insulation color topcoat for vehicles of the present invention can achieve a significant thermal insulation effect.

Claims

1. A solvent-based polymer nano thermal insulation color topcoat for vehicles, characterized in that The invention comprises the following materials in parts by weight: 50-70 parts of high molecular thermoplastic acrylic resin, 2-15 parts of nanomaterials, 5-10 parts of n-butyl acetate, 5-10 parts of xylene, 5-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 1-30 parts of pigment, 0-8 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-10 parts of dispersant and 0.5-1 parts of adhesion promoter.

2. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 55-75 parts of high molecular thermoplastic acrylic resin, 2-12 parts of nanomaterials, 1-5 parts of n-butyl acetate, 1-5 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 0-5 parts of methyl isobutyl ketone, 0-5 parts of dibasic acid ester, 2-20 parts of pigment, 1-5 parts of cellulose acetate, 0.1-3 parts of leveling agent, 1-10 parts of dispersant and 0.5-2 parts of adhesion promoter.

3. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 60-80 parts of high molecular thermoplastic acrylic resin, 2-10 parts of nanomaterials, 1-10 parts of n-butyl acetate, 1-10 parts of xylene, 1-10 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-10 parts of methyl isobutyl ketone, 1-5 parts of dibasic acid ester, 3-15 parts of pigment, 2-10 parts of cellulose acetate, 0.1-5 parts of leveling agent, 2-12 parts of dispersant and 0.2-3 parts of adhesion promoter.

4. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 40-80 parts of high molecular thermoplastic acrylic resin, 1-10 parts of nanomaterials, 1-15 parts of n-butyl acetate, 1-15 parts of xylene, 2-12 parts of propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, 1-5 parts of methyl isobutyl ketone, 2-10 parts of dibasic acid ester, 1-30 parts of pigment, 1-15 parts of cellulose acetate, 0.1-5 parts of leveling agent, 1-15 parts of dispersant and 0.1-5 parts of adhesion promoter.

5. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to any one of claims 1 to 4, characterized in that The solvent-based polymer nano thermal insulation topcoat of various colors for vehicles uses a polymer thermoplastic acrylic resin with a solid content of 50-70% of thermoplastic acrylic resin, a hydroxyl value of ≤2.0, an acid value of ≤7, a drying temperature of 5-180°C, and a baking drying time of less than 3 minutes.

6. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to any one of claims 1 to 4, characterized in that The nanomaterials used in the solvent-based polymer nano thermal insulation topcoat of various colors for vehicles are modified ATO nano slurry, nano ITO dispersion, nano ATO dispersion, nano ITO, nano GTO thermal insulation powder, nano zirconium oxide, nano AZO, silica aerogel powder or silica aerogel paste. According to the thermal insulation performance and cost control, at least one or more combinations are used. The nanomaterial has a low thermal conductivity (after drying, 25° C.) of 0.001 to 3 W / (m·K) and a particle size of 0.1 to 20 μm.

7. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to any one of claims 1 to 4, characterized in that The purity of n-butyl acetate, xylene, propylene glycol methyl ether acetate or ethylene glycol ethyl ether acetate, methyl isobutyl ketone and dibasic acid ester used in the solvent-based polymer nano thermal insulation topcoat of various colors for vehicles is ≥99.5%, and the water content is ≤500ppm.

8. The solvent-based polymer nano thermal insulation color topcoat for vehicles according to any one of claims 1 to 4, characterized in that The pigments used in the solvent-based polymer nano thermal insulation color topcoat for vehicles are organic pigments and inorganic pigments, and the pigments can be titanium dioxide or light-fast yellow or isoindoline yellow or cadmium yellow or medium chrome yellow or iron oxide yellow or toluidine red or iron oxide red or phthalocyanine blue or indanthrene blue or phthalocyanine green or carbon black or silver powder or mica pearl powder or purple; The cellulose acetate used in the various color topcoats of solvent-based polymer nano thermal insulation for vehicles is CAB381-0.5, CAB381-2, CAB381-20, which can be a single variety of the above three CABs, or a combination of two or three in any proportion; The leveling agent used in the solvent-based polymer nano thermal insulation color topcoat for vehicles is an organic silicon leveling agent, an acrylate leveling agent, a fluorine-modified leveling agent, or any one of them, or any two or any three of them in any proportion; The dispersant used in the solvent-based polymer nano thermal insulation color topcoat for vehicles is an anionic wetting dispersant, a nonionic wetting dispersant, an electrically neutral wetting dispersant, or a polymer super dispersant; The adhesion promoter used in the solvent-based polymer nano thermal insulation color topcoat for vehicles is a silane coupling agent, and the coupling agent should have good compatibility with the selected thermoplastic acrylic resin.

9. An application of the solvent-based polymer nano thermal insulation color topcoat for vehicles as claimed in any one of claims 1 to 4, characterized in that The solvent-based polymer nano thermal insulation color topcoat for vehicles is used in the field of coating preparation.

10. A method for preparing a solvent-based polymer nano thermal insulation color topcoat for vehicles as claimed in any one of claims 1 to 4, characterized in that: These include: S1. Select the solvent raw materials according to the components and test each material to ensure it meets the standards; S2, weighing a high molecular thermoplastic acrylic resin by weight and slowly adding it into a container, and slowly adding various solvents, dispersants, leveling agents, cellulose acetate, and adhesion promoters under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10-20min, and slowly adding pigments under stirring, and dispersing them at a speed of 500-800r / min in an explosion-proof disperser for 10min; obtaining a mixed color paste; At the same time, in this step, 20% by weight of the high molecular thermoplastic acrylic resin and 20% by weight of n-butyl acetate and xylene are reserved, 15% by weight of the high molecular thermoplastic acrylic resin and 15% by weight of n-butyl acetate and xylene are used to clean the sand mill, and the remaining 5% by weight of the high molecular thermoplastic acrylic resin and 5% by weight of n-butyl acetate and xylene are used to adjust the viscosity of the nano color paste mixture; S3, grinding the mixed color paste obtained in S2 with a sand mill, and testing the fineness with a fineness meter after each grinding. When the fineness of the mixed color paste is ≤20 μm, stop grinding, weigh the mixed color paste, and make up the solvent lost by evaporation during the grinding process with xylene; S4. Use an explosion-proof disperser to disperse the color paste with qualified fineness at a speed of 200-300r / min. Under stirring, slowly add the nanomaterial, gradually increase the dispersion speed to 800r / min, and disperse for 30 minutes to obtain a nano color paste mixture; The various indicators of the nano-color paste mixture prepared by S5 and S4 are tested. During the test, if the fineness is unqualified, it is quickly ground again with a sand mill until the fineness is qualified. When the viscosity is higher than 202s, add an appropriate amount of n-butyl acetate and xylene reserved in S2 to lower it. When the viscosity is less than 198s, add the high molecular thermoplastic acrylic resin reserved in S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the coating of 4 cups itself is also required to be 25℃±1. When the indoor temperature is higher than 26℃, the coating of 4 cups needs to be cooled with a refrigerator or ice cubes. When the indoor temperature is less than 24℃, the coating of 4 cups needs to be heated in an oven. The specific indicators are shown in the table below: S6. Filter the qualified nano-color paste mixture with a 200-mesh filter cloth.

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