Macromolecular nano heat-insulating water-based varnish for repairing appearance of vehicle

Abstract

The invention discloses a high-molecular nano heat-insulating water-based varnish for repairing the appearance of a vehicle. The coating is prepared from 30-50 parts of high-molecular water-based hydroxy acrylic resin, 0-30 parts of high-molecular water-based saturated polyester resin, 0-20 parts of high-molecular water-based alkyd resin, 1-15 parts of a nano material, 5-10 parts of n-butyl alcohol, 0-10 parts of propylene glycol methyl ether acetate, 1-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of a flatting agent, 0.5-3 parts of a drier and 0.5-1 part of an adhesion promoter. The paint is used for vehicles, the paint film is high in heat insulation rate, simple in construction and high in construction efficiency, mixed resin of high-molecular water-based hydroxy acrylic resin, high-molecular water-based alkyd resin and high-molecular water-based saturated polyester resin is used as a film forming matter, and the heat insulation effect of the paint film is achieved by adding nano materials. And a coating product with heat insulation performance and excellent water resistance and aging resistance is prepared in a simplest physical mixing and stirring mode in the field of taking the mixed resin as a film forming matter, and the method is energy-saving, time-saving and high in preparation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle polymer coating preparation, in particular to a polymer nano-insulated water-soluble varnish for vehicle appearance repair and a preparation method thereof. Background Art

[0002] On December 3, 2015, our company was authorized to obtain the invention patent of "a kind of vehicle paint", with the patent number "ZL201310218567.1", on November 17, 2020, it was authorized to obtain the invention patent of "a kind of environmentally friendly water-based automotive metallic flash paint and its preparation method", with the patent number "ZL201811169790.0", and on October 26, 2021, it was authorized to obtain the invention patent of "a kind of self-repairing water-based polyurethane coating composition and coating", with the patent number "ZL202010748471.6". Through these three patented technologies, vehicle varnish can be produced with water-based hydroxyl acrylic resin, water-based alkyd resin, and water-based polyester resin as the main film-forming substances, and leveling agents, drying agents, and alcohol organic solvents such as n-butanol, and sprayed by a spray gun, a bright and smooth varnish 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 so, human protection of the atmosphere and the environment. During the paint spraying construction process, water-based paint products have less VOC emissions and are more environmentally friendly.

[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, a water-based varnish with heat-insulating properties is coated on the car body and car glass, which can not only 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, make the temperature inside the car rise slightly or not rise at all, save electricity consumption, extend the vehicle's cruising range, achieve energy conservation and emission reduction, extend the service life of the vehicle, protect the lives of passengers, and at the same time better protect the atmosphere and the environment. After years of research and development, our company has developed a polymer nano-insulating water-based varnish for vehicle exterior repair and a preparation method thereof. At the same time, the preparation method is transformed into a set of nano-insulating water-based varnish products for vehicles, which effectively reduces the problem of energy consumption of vehicle air conditioning and achieves the environmental protection goal of low VOC emissions. Summary of the invention

[0007] The purpose of the present invention is to provide a polymer nano-insulated water-soluble varnish for vehicle exterior repair and a preparation method thereof, so as 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 polymer nano-insulated water-based varnish for vehicle exterior repair comprises the following materials in parts by weight: 30-50 parts of polymer water-based hydroxy acrylic resin, 0-30 parts of polymer water-based saturated polyester resin, 0-20 parts of polymer water-based alkyd resin, 1-15 parts of nanomaterials, 5-10 parts of n-butanol, 5-10 parts of propylene glycol methyl ether acetate, 1-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of leveling agents, 0.5-3 parts of drying agents, and 0.5-1 parts of adhesion promoters.

[0009] As a further scheme of the present invention: the following materials are included in parts by weight: 50-70 parts of polymer water-based hydroxy acrylic resin, 1-20 parts of polymer water-based saturated polyester resin, 1-12 parts of nanomaterials, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-10 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of leveling agent, 0.5-2 parts of drying agent, and 0.5-3 parts of adhesion promoter.

[0010] As a further scheme of the present invention: the following materials are included in parts by weight: 30-60 parts of polymer water-based hydroxy acrylic resin, 1-25 parts of polymer water-based alkyd resin, 1-11 parts of nanomaterials, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-15 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of leveling agents, 0.5-2 parts of drying agents, and 0.5-3 parts of adhesion promoters.

[0011] As a further scheme of the present invention: the following materials are included in parts by weight: 20-40 parts of polymer water-based hydroxy acrylic resin, 1-15 parts of polymer water-based saturated polyester resin, 1-10 parts of polymer water-based alkyd resin, 1-10 parts of nanomaterials, 0-5 parts of n-butanol, 0-5 parts of propylene glycol methyl ether acetate, 10-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of leveling agents, 0.1-5 parts of drying agents, and 0.1-5 parts of adhesion promoters.

[0012] 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.

[0013] As a further solution of the present invention: the leveling agent is an organic silicone leveling agent, an acrylate leveling agent, or a fluorine-modified leveling agent, and the above leveling agents are used alone or in combination of two or three.

[0014] As a further solution of the present invention: the drier is an organotin drier.

[0015] As a further solution of the present invention: the deionized water is obtained by an industrial pure water machine.

[0016] As a further solution of the present invention: the adhesion promoter is a silane coupling agent.

[0017] A method for preparing the above-mentioned polymer nano-insulated water-soluble varnish for vehicle exterior repair comprises the following steps:

[0018] S1. Prepare raw materials and test each material according to the standards to ensure the quality and stability of the product;

[0019] S2, weighing a high molecular weight water-based hydroxy acrylic resin and slowly adding it into a container, and slowly adding 50% of a drying agent while stirring, and dispersing it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min, and slowly adding nanomaterials while stirring, and dispersing it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min; obtaining a primary nanomaterial mixed solution;

[0020] This step requires to reserve a weight component of high molecular weight water-based hydroxy acrylic resin to adjust the viscosity of the initial nano material mixture;

[0021] S3, the viscosity, fineness and other indicators of the initial nanomaterial mixture prepared in S2 are tested. After all indicators are qualified, enter S4. When the viscosity is greater than 82s, add an appropriate amount of deionized water in the material to lower it. When the viscosity is less than 78s, add the high molecular water-based hydroxyl acrylic resin reserved in S2 to increase it. 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:

[0022]

[0023] S4, weighing polymer water-based saturated polyester resin, polymer water-based alkyd resin, n-butanol, propylene glycol methyl ether acetate, other alcohol organic solvents, leveling agent, drying agent, adhesion promoter, slowly adding the nano material mixture, and immediately increasing the speed of the disperser to 600-800 rpm, high-speed dispersion for 50-60 minutes, to obtain a polymer nano-insulated water-based varnish for vehicle exterior repair,

[0024] In this step, 5% by weight of deionized water is reserved to adjust the viscosity of the polymer nano-insulated water-soluble varnish for vehicle exterior repair;

[0025] S5. Test various indicators of the polymer nano-insulated water-based varnish for vehicle exterior repair prepared by S4. When the viscosity is greater than 52s, use the deionized water reserved by S4 to lower it. When the viscosity is less than 48s, add the polymer water-based hydroxy acrylic resin reserved by S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the coating 4 cups itself is also required to be 25℃±1. When the indoor temperature is higher than 26℃, it is necessary to use a refrigerator or ice cubes to cool the coating 4 cups. When the indoor temperature is less than 24℃, it is necessary to use an oven to heat the coating 4 cups. The specific indicators are shown in the table below:

[0026]

[0027]

[0028] S6. Filter the polymer nano-insulated water-soluble varnish for vehicle exterior repair that has passed the test in S5 using a 300-mesh filter cloth to obtain a qualified polymer nano-insulated water-soluble varnish for vehicle exterior repair.

[0029] The above-mentioned polymer nano-insulated water-soluble varnish for vehicle appearance repair is used in the field of coating preparation.

[0030] Compared with the prior art, the invention has the following beneficial effects: a polymer nano-insulated water-based varnish for vehicle exterior repair is realized, and the polymer water-based hydroxy acrylic resin, polymer water-based saturated polyester resin, and polymer water-based alkyd resin are used as the main materials, and the small size effect and surface effect of the nano-materials are adjusted by adding nano-materials, deionized water, alcohol organic solvents, leveling agents, and drying agents to make it have certain physical and chemical properties. The nano-particles can be filled in the gaps between the resin molecules, enhance the compactness of the varnish, and improve its barrier properties. At the same time, the nano-materials can also reflect or absorb heat to play a role in heat insulation, so as to achieve the preparation of a water-based varnish with high heat insulation rate, good leveling, high fullness, high hardness, high gloss, good weather resistance, and low VOC emission. After spraying, the heat outside the vehicle is blocked from being transferred to the inside of the vehicle, reducing the influence of the temperature outside the vehicle on the temperature inside the vehicle, so that the temperature inside the vehicle is slightly increased or not increased, the temperature inside the vehicle is reduced, electricity is saved, the vehicle's cruising range is increased, energy conservation and emission reduction are achieved, and the protection of the atmosphere and the environment is improved. At the same time, it can extend the service life of the vehicle and indirectly protect the life safety of passengers. This product has high thermal insulation rate, easy construction, high construction efficiency, good surface effect, and good weather resistance. It can be widely used in vehicle repair and is an environmentally friendly product. DETAILED DESCRIPTION

[0031] 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.

[0032] Implementation Example 1

[0033] A preparation method for a polymer nano-insulated water-based varnish for vehicle exterior repair comprises the following materials in parts by weight: 30-50 parts of a polymer water-based hydroxy acrylic resin, 0-30 parts of a polymer water-based saturated polyester resin, 0-20 parts of a polymer water-based alkyd resin, 1-15 parts of a nano material, 5-10 parts of n-butanol, 5-10 parts of propylene glycol methyl ether acetate, 1-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of a leveling agent, 0.5-3 parts of a drying agent, and 0.5-1 parts of an adhesion promoter.

[0034] Specifically, in this embodiment, the polymer water-based hydroxyl acrylic resin adopts a water-based hydroxyl acrylic resin with a solid content of 40-60%, a hydroxyl value of 2.0-5.0, and the drying temperature of the resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C;

[0035] Specifically, in this embodiment, the polymer water-based saturated polyester resin is a water-based saturated polyester resin with a solid content of 50-80% and a hydroxyl value of 3.0-5.0. The drying temperature of the resin cannot be higher than 80°C, and the self-drying time at 25°C is less than 12 hours. It can be imported or domestically produced;

[0036] Specifically, in this embodiment, the drying temperature of the polymer water-based alkyd resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C.

[0037] 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.

[0038] Specifically, in this embodiment, the purity of the n-butanol is above 99.5%, and any manufacturer may be used;

[0039] Specifically, in this embodiment, the propylene glycol methyl ether acetate has a purity of more than 99% and can be produced by any manufacturer;

[0040] Specifically, in this embodiment, the other alcohol organic solvent is isobutyl alcohol, isopropyl alcohol, etc., and any manufacturer can be used;

[0041] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, a polyester leveling agent, a fluorine-modified leveling agent, and products of manufacturers such as BYK, BASF, and Axal can be used;

[0042] Specifically, in this embodiment, the drier is an organic tin drier, and any manufacturer's product may be used;

[0043] Specifically, in this embodiment, the deionized water is obtained by an industrial pure water machine.

[0044] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, and any manufacturer's product can be used;

[0045] Implementation Example 2

[0046] A preparation method for a polymer nano-insulated water-based varnish for vehicle exterior repair comprises the following materials in parts by weight: 50-70 parts of a polymer water-based hydroxy acrylic resin, 1-20 parts of a polymer water-based saturated polyester resin, 1-12 parts of a nano material, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-10 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of a leveling agent, 0.5-2 parts of a drying agent, and 0.5-3 parts of an adhesion promoter.

[0047] Specifically, in this embodiment, the polymer water-based hydroxyl acrylic resin adopts a water-based hydroxyl acrylic resin with a solid content of 40-60%, a hydroxyl value of 2.0-5.0, and the drying temperature of the resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C;

[0048] Specifically, in this embodiment, the polymer water-based saturated polyester resin is a water-based saturated polyester resin with a solid content of 50-80% and a hydroxyl value of 3.0-5.0. The drying temperature of the resin cannot be higher than 80°C, and the self-drying time at 25°C is less than 12 hours. It can be imported or domestically produced;

[0049] Specifically, in this embodiment, the drying temperature of the polymer water-based alkyd resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C.

[0050] 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.

[0051] Specifically, in this embodiment, the purity of the n-butanol is above 99.5%, and any manufacturer may be used;

[0052] Specifically, in this embodiment, the propylene glycol methyl ether acetate has a purity of more than 99% and can be produced by any manufacturer;

[0053] Specifically, in this embodiment, the other alcohol organic solvent is isobutyl alcohol, isopropyl alcohol, etc., and any manufacturer can be used;

[0054] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, a polyester leveling agent, a fluorine-modified leveling agent, and products of manufacturers such as BYK, BASF, and Axal can be used;

[0055] Specifically, in this embodiment, the drier is an organic tin drier, and any manufacturer's product may be used;

[0056] Specifically, in this embodiment, the deionized water is obtained by an industrial pure water machine.

[0057] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, and any manufacturer's product can be used;

[0058] Implementation Example 3

[0059] A preparation method for a polymer nano-insulated water-based varnish for vehicle exterior repair comprises the following materials in parts by weight: 30-60 parts of a polymer water-based hydroxy acrylic resin, 1-25 parts of a polymer water-based alkyd resin, 1-11 parts of a nano material, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-15 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of a leveling agent, 0.5-2 parts of a drying agent, and 0.5-3 parts of an adhesion promoter.

[0060] Specifically, in this embodiment, the polymer water-based hydroxyl acrylic resin adopts a water-based hydroxyl acrylic resin with a solid content of 40-60%, a hydroxyl value of 2.0-5.0, and the drying temperature of the resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C;

[0061] Specifically, in this embodiment, the polymer water-based saturated polyester resin is a water-based saturated polyester resin with a solid content of 50-80% and a hydroxyl value of 3.0-5.0. The drying temperature of the resin cannot be higher than 80°C, and the self-drying time at 25°C is less than 12 hours. It can be imported or domestically produced;

[0062] Specifically, in this embodiment, the drying temperature of the polymer water-based alkyd resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C.

[0063] 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.

[0064] Specifically, in this embodiment, the purity of the n-butanol is above 99.5%, and any manufacturer may be used;

[0065] Specifically, in this embodiment, the propylene glycol methyl ether acetate has a purity of more than 99% and can be produced by any manufacturer;

[0066] Specifically, in this embodiment, the other alcohol organic solvent is isobutyl alcohol, isopropyl alcohol, etc., and any manufacturer can be used;

[0067] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, a polyester leveling agent, a fluorine-modified leveling agent, and products of manufacturers such as BYK, BASF, and Axal can be used;

[0068] Specifically, in this embodiment, the drier is an organic tin drier, and any manufacturer's product may be used;

[0069] Specifically, in this embodiment, the deionized water is obtained by an industrial pure water machine.

[0070] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, and any manufacturer's product can be used;

[0071] Implementation Example 4

[0072] A preparation method for a polymer nano-insulated water-based varnish for vehicle exterior repair comprises the following materials in parts by weight: 20-40 parts of a polymer water-based hydroxy acrylic resin, 1-15 parts of a polymer water-based saturated polyester resin, 1-10 parts of a polymer water-based alkyd resin, 1-10 parts of a nano material, 0-5 parts of n-butanol, 0-5 parts of propylene glycol methyl ether acetate, 10-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of a leveling agent, 0.1-5 parts of a drying agent, and 0.1-5 parts of an adhesion promoter.

[0073] Specifically, in this embodiment, the polymer water-based hydroxyl acrylic resin adopts a water-based hydroxyl acrylic resin with a solid content of 40-60%, a hydroxyl value of 2.0-5.0, and the drying temperature of the resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C;

[0074] Specifically, in this embodiment, the polymer water-based saturated polyester resin is a water-based saturated polyester resin with a solid content of 50-80% and a hydroxyl value of 3.0-5.0. The drying temperature of the resin cannot be higher than 80°C, and the self-drying time at 25°C is less than 12 hours. It can be imported or domestically produced;

[0075] Specifically, in this embodiment, the drying temperature of the polymer water-based alkyd resin cannot be higher than 80°C, and the self-drying time is less than 12 hours at 25°C.

[0076] 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.

[0077] Specifically, in this embodiment, the purity of the n-butanol is above 99.5%, and any manufacturer may be used;

[0078] Specifically, in this embodiment, the propylene glycol methyl ether acetate has a purity of more than 99% and can be produced by any manufacturer;

[0079] Specifically, in this embodiment, the other alcohol organic solvent is isobutyl alcohol, isopropyl alcohol, etc., and any manufacturer can be used;

[0080] Specifically, in this embodiment, the leveling agent is a silicone leveling agent, a polyester leveling agent, a fluorine-modified leveling agent, and products of manufacturers such as BYK, BASF, and Axal can be used;

[0081] Specifically, in this embodiment, the drier is an organic tin drier, and any manufacturer's product may be used;

[0082] Specifically, in this embodiment, the deionized water is obtained by an industrial pure water machine.

[0083] Specifically, in this embodiment, the adhesion promoter is a silane coupling agent, and any manufacturer's product can be used;

[0084] The method for preparing the polymer nano-insulated water-soluble varnish for vehicle exterior repair comprises the following steps:

[0085] S1. Prepare raw materials and test each material according to the standards to ensure the quality and stability of the product;

[0086] S2, weighing a high molecular weight water-based hydroxy acrylic resin and slowly adding it into a container, and slowly adding 50% of a drying agent while stirring, and dispersing it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min, and slowly adding nanomaterials while stirring, and dispersing it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min; obtaining a primary nanomaterial mixed solution;

[0087] This step requires to reserve a weight component of high molecular weight water-based hydroxy acrylic resin to adjust the viscosity of the initial nano material mixture;

[0088] S3, the viscosity, fineness and other indicators of the initial nanomaterial mixture prepared in S2 are tested. After all indicators are qualified, enter S4. When the viscosity is greater than 82s, add an appropriate amount of deionized water in the material to lower it. When the viscosity is less than 78s, add the high molecular water-based hydroxyl acrylic resin reserved in S2 to increase it. 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:

[0089]

[0090] S4, weighing polymer water-based saturated polyester resin, polymer water-based alkyd resin, n-butanol, propylene glycol methyl ether acetate, other alcohol organic solvents, leveling agent, drying agent, adhesion promoter, slowly adding the nano material mixture, and immediately increasing the speed of the disperser to 600-800 rpm, high-speed dispersion for 50-60 minutes, to obtain a polymer nano-insulated water-based varnish for vehicle exterior repair,

[0091] In this step, 5% by weight of deionized water is reserved to adjust the viscosity of the polymer nano-insulated water-soluble varnish for vehicle exterior repair;

[0092] S5. Test various indicators of the polymer nano-insulated water-based varnish for vehicle exterior repair prepared by S4. When the viscosity is greater than 52s, use the deionized water reserved by S4 to lower it. When the viscosity is less than 48s, add the polymer water-based hydroxy acrylic resin reserved by S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the coating 4 cups itself is also required to be 25℃±1. When the indoor temperature is higher than 26℃, it is necessary to use a refrigerator or ice cubes to cool the coating 4 cups. When the indoor temperature is less than 24℃, it is necessary to use an oven to heat the coating 4 cups. The specific indicators are shown in the table below:

[0093]

[0094] S6. Filter the polymer nano-insulated water-soluble varnish for vehicle exterior repair that has passed the test in S5 using a 300-mesh filter cloth to obtain a qualified polymer nano-insulated water-soluble varnish for vehicle exterior repair.

[0095] 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.

[0096] The preparation of the polymer nano-insulated water-soluble varnish for vehicle exterior repair is an application in the field of coating preparation.

[0097] In addition, compared with the vehicle paint 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, reduce VOC emissions, 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 passengers. The product has high thermal insulation rate, easy construction, high construction efficiency, good surface effect, and good weather resistance, and can be widely used in vehicle repair.

[0098] After the varnish product prepared by a method for preparing a polymer nano thermal insulation water-based varnish for vehicle exterior repair is sprayed on the vehicle body surface, the comparison of the external and internal temperatures of the vehicle with the varnish product for ordinary vehicles sprayed on the vehicle body surface is as follows: After the varnish product prepared by a method for preparing a polymer solvent-based nano thermal insulation varnish for vehicle exterior repair is sprayed on the vehicle body surface, the comparison of the external and internal temperatures of the vehicle with the varnish product for ordinary vehicles sprayed on the vehicle body surface is as follows:

[0099]

[0100] It can be seen from the above table that the use of the polymer nano-insulated water-soluble varnish for vehicle exterior repair of the present invention can obtain a significant heat-insulating effect.

Claims

1. A polymer nano-insulated water-soluble varnish for vehicle exterior repair, characterized in that The invention comprises the following materials in parts by weight: 30-50 parts of polymer water-based hydroxy acrylic resin, 0-30 parts of polymer water-based saturated polyester resin, 0-20 parts of polymer water-based alkyd resin, 1-15 parts of nanomaterials, 5-10 parts of n-butanol, 5-10 parts of propylene glycol methyl ether acetate, 1-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of leveling agent, 0.5-3 parts of drying agent and 0.5-1 parts of adhesion promoter.

2. The polymer nano water-insulating varnish for vehicle exterior repair according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 50-70 parts of polymer water-based hydroxy acrylic resin, 1-20 parts of polymer water-based saturated polyester resin, 1-12 parts of nanomaterials, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-10 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of leveling agent, 0.5-2 parts of drying agent and 0.5-3 parts of adhesion promoter.

3. The polymer nano water-insulating varnish for vehicle exterior repair according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 30-60 parts of polymer water-based hydroxy acrylic resin, 1-25 parts of polymer water-based alkyd resin, 1-11 parts of nanomaterials, 5-8 parts of n-butanol, 2-5 parts of propylene glycol methyl ether acetate, 5-15 parts of deionized water, 0-8 parts of other organic alcohol cosolvents, 0.1-3 parts of leveling agent, 0.5-2 parts of drying agent and 0.5-3 parts of adhesion promoter.

4. The polymer nano water-insulating varnish for vehicle exterior repair according to claim 1, characterized in that The invention comprises the following materials in parts by weight: 20-40 parts of polymer water-based hydroxy acrylic resin, 1-15 parts of polymer water-based saturated polyester resin, 1-10 parts of polymer water-based alkyd resin, 1-10 parts of nanomaterials, 0-5 parts of n-butanol, 0-5 parts of propylene glycol methyl ether acetate, 10-20 parts of deionized water, 0-10 parts of other organic alcohol cosolvents, 0.1-5 parts of leveling agent, 0.1-5 parts of drying agent and 0.1-5 parts of adhesion promoter.

5. The polymer nano water-insulating varnish for vehicle exterior repair according to any one of claims 1 to 4, characterized in that The polymer nano-insulated water-soluble varnish for vehicle exterior repair uses a resin that is a water-based hydroxy acrylic resin, a mixed resin of a water-based hydroxy acrylic resin and a water-based saturated polyester resin, a mixed resin of a water-based hydroxy acrylic resin and a water-based alkyd resin, or a mixed resin of a water-based hydroxy acrylic resin, a water-based saturated polyester resin, and a water-based alkyd resin.

6. The polymer nano water-insulating varnish for vehicle exterior repair according to any one of claims 1 to 4, characterized in that The nanomaterials used in the polymer nano-insulating water-soluble varnish for vehicle exterior repair are 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.

7. The polymer nano water-insulating varnish for vehicle exterior repair according to any one of claims 1 to 4, characterized in that The leveling agent used in the polymer nano water-insulating water varnish for vehicle appearance repair is a combination of three types of silicone leveling agent, acrylate leveling agent, and fluorine-modified leveling agent, and can also be any one of the above three leveling agents or a combination of any two of the above three leveling agents; the organic auxiliary alcohol solvent used in the polymer nano water-insulating water varnish for vehicle appearance repair is a combination of different components of organic alcohol solvents such as isobutyl alcohol and isopropyl alcohol; the drying agent used in the polymer nano water-insulating water varnish for vehicle appearance repair is an organic tin drying agent; the adhesion promoter used in the polymer nano water-insulating water varnish for vehicle appearance repair is a silane coupling agent; the solvents used in the polymer nano water-insulating water varnish for vehicle appearance repair are n-butanol and propylene glycol methyl ether acetate; the deionized water used in the polymer nano water-insulating water varnish for vehicle appearance repair is prepared by an industrial pure water machine.

8. An application of a polymer nano-insulated water-soluble varnish for vehicle exterior repair as claimed in any one of claims 1 to 4, characterized in that: The polymer nano water-insulating varnish for vehicle exterior repair is used in the field of coating preparation.

9. A method for preparing a polymer nano-insulated water-soluble varnish for vehicle exterior repair according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Prepare raw materials and test each material according to the standards; S2. Weigh the polymer water-based hydroxyl acrylic resin by weight and slowly add it into the container, and slowly add 50% of the drying agent while stirring, and disperse it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min, and slowly add the nanomaterial while stirring, and disperse it at a speed of 300-500r / min in an explosion-proof disperser for 10-20min; Obtaining a mixed solution of primary nanomaterials; This step requires to reserve a weight component of high molecular weight water-based hydroxy acrylic resin to adjust the viscosity of the initial nano material mixture; S3, the viscosity, fineness and other indicators of the initial nanomaterial mixture prepared in S2 are tested. After all indicators are qualified, enter S4. When the viscosity is greater than 82s, add an appropriate amount of deionized water in the material to lower it. When the viscosity is less than 78s, add the high molecular water-based hydroxyl acrylic resin reserved in S2 to increase it. 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: S4, weighing polymer water-based saturated polyester resin, polymer water-based alkyd resin, n-butanol, propylene glycol methyl ether acetate, other alcohol organic solvents, leveling agent, drying agent, adhesion promoter, slowly adding the nano material mixture, and immediately increasing the speed of the disperser to 600-800 rpm, high-speed dispersion for 50-60 minutes, to obtain a polymer nano-insulated water-based varnish for vehicle exterior repair, In this step, 5% by weight of deionized water is reserved to adjust the viscosity of the polymer nano-insulated water-soluble varnish for vehicle exterior repair; S5. Test various indicators of the polymer nano-insulated water-based varnish for vehicle exterior repair prepared by S4. When the viscosity is greater than 52s, use the deionized water reserved by S4 to lower it. When the viscosity is less than 48s, add the polymer water-based hydroxy acrylic resin reserved by S2 to increase it. Pay special attention to the fact that when measuring the viscosity, the coating 4 cups itself is also required to be 25℃±1. When the indoor temperature is higher than 26℃, it is necessary to use a refrigerator or ice cubes to cool the coating 4 cups. When the indoor temperature is less than 24℃, it is necessary to use an oven to heat the coating 4 cups. The specific indicators are shown in the table below: S6. Filter the polymer nano-insulated water-soluble varnish for vehicle exterior repair that has passed the test in S5 using a 300-mesh filter cloth to obtain a qualified polymer nano-insulated water-soluble varnish for vehicle exterior repair.

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