CN113755070B - Water-based heat-insulating coating for inner wall of passenger car and preparation method and application thereof - Google Patents
Water-based heat-insulating coating for inner wall of passenger car and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/18—Homopolymers or copolymers of nitriles
- C09D133/20—Homopolymers or copolymers of acrylonitrile
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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
- C09D5/004—Reflecting paints; Signal paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention provides a water-based heat-insulating coating for an inner wall of a passenger car and a preparation method thereof. At present, the substitution of polyurethane foaming materials is increasingly urgent, and although a lot of research work is also done in China, mature products are not found. The water-based heat insulation coating for the inner wall of the passenger car has a remarkable heat insulation effect on the passenger car, solves the problem that the passenger car needs to be heat insulated when the passenger car runs outdoors for a long time under a high-temperature condition, protects passengers by coating without peculiar smell, and increases the comfort level.
Description
Technical Field
The invention belongs to the technical field of heat insulation of inner walls of passenger cars, and relates to a water-based heat insulation coating for inner walls of passenger cars. More specifically, the coating applied to the inner wall of the passenger car mainly aims at replacing polyurethane foam materials which are not environment-friendly and achieving the heat insulation effect and the environment-friendly effect.
Background
Polyurethane foaming materials are used in the field of heat insulation of inner walls of passenger cars all the time, and the materials do not have environmental protection property and have far different requirements on aspects of environmental protection, energy conservation, emission reduction, hazardous chemical treatment and the like in recent years. Polyurethane foam materials are used for the inner wall of a passenger car in China all the time to achieve the effects of heat insulation and heat preservation, but the materials do not meet the requirement of environmental protection, and a coating film continuously releases peculiar smell to hurt passengers in the using process of the passenger car. At present, the substitution of polyurethane foaming materials is increasingly urgent, and although a lot of research work is done in China, mature products are not found. The spraying and performance test on the coating film of the 'waterborne heat-insulating coating for the inner wall of the passenger car' researched and developed by our company discovers that the product has the advantages of uniform coating film, low heat conductivity coefficient, low VCO content and excellent medium resistance, and the product has good application and popularization values.
The patent project aims to develop the inner wall water-based heat insulation coating for the passenger car to replace a polyurethane foaming material, thereby achieving the purposes of water-based environmental protection, VOC emission reduction, danger reduction and the like. The developed product of the patent is diluted by water, the VOC of the coating is less than 30g/L, the heat insulation effect of the coating is excellent, the construction is simple and convenient, the application of the product can improve the coating quality of a passenger car, meet the national requirements and simultaneously improve the comprehensive competitiveness of enterprises and products.
Disclosure of Invention
The invention discloses a preparation method of a water-based heat-insulating coating for an inner wall of a passenger car. The paint consists of water-based hollow emulsion 45-65 parts, dispersant 0.3-1.0 part, wetting agent 0.3-1.0 part, defoaming agent 0.3-0.8 part, anti-settling agent 1-2 parts, hollow glass bead 15-20 parts, aerogel 0.5-2 parts, pH regulator 0.1-0.2 part, thickener 0.3-1 part, titanium dioxide 8-15 parts, film forming assistant 1.5-2.5 parts, leveling agent 0.05-0.15 part and deionized water 3-8 parts. The invention relates to a water-based heat-insulating coating for the inner wall of a passenger car, which solves the problem of heat-insulating materials of the passenger car according to the current situation, national requirements and application prospects of heat-insulating products for the inner wall of the passenger car and the requirements of heat-insulating effects provided by customers.
The current situation, national requirements and application prospects of the passenger car inner wall heat insulation product are based on the requirements of heat insulation effect provided by customers, the problem of passenger car heat insulation materials is solved by 'a water-based heat insulation coating for the inner wall of a passenger car', the product has the characteristics of water-based environmental protection, low VOC (volatile organic compound) emission and simple and easy construction, and the coating film achieves the purposes of excellent performance, environmental protection and VOC emission reduction.
In order to achieve the purpose, the invention discloses the following technical contents:
a waterborne heat insulation coating for the inner wall of a passenger car is characterized by comprising the following raw materials in parts by weight:
the main components are as follows:
raw material name and mass portion
45-65 parts of water-based hollow emulsion
0.3-1.0% of dispersant
0.3-1.0 of wetting agent
Defoaming agent 0.3-0.8
Anti-settling agent 1-2
Hollow glass micro-bead 15-20
0.5-2% of aerogel
pH regulator 0.1-0.2
0.3-1 part of thickening agent
Rutile type titanium dioxide 8-15
Film-forming assistant 1.5-2.5
0.05-0.15 of leveling agent
Deionized water 3-8
The invention is preferably used for a water-based heat-insulating coating for the inner wall of a passenger car, and the coating is prepared from the following raw materials in parts by weight:
the main components are as follows:
raw material name and mass portion
Aqueous hollow emulsion 57
Dispersant 0.5
Wetting agent 0.4
Antifoam agent 0.3
Anti-settling agent 1.0
Hollow glass bead 15.0
Aerogels 1.5
pH regulator 0.1
Thickener RM-8W 0.4
Rutile titanium dioxide 14.0
film-Forming aid 2.0
Leveling agent 0.08
Deionized water 7.72
Wherein the raw materials are as follows:
aqueous hollow emulsion: self-made
Dispersing agent: kuaiyi dispersant
Wetting agent: CF-10
Defoaming agent: BYK-022 defoaming agent
Anti-settling agent: expanded water-based bentonite SHV
Hollow glass beads: c15
Aerogel: self-made
pH regulators: dimethylethanolamine
Thickening agent: RM-8W
Titanium dioxide: r706
Film-forming auxiliary agent: alcohol ester-12
Leveling agent: TEGO1488
Wherein:
preparation of aqueous hollow emulsion:
preparing a water phase: 200g of polyethanol are dissolved in 600g of deionized water at 40 ℃, 0.5g of dodecyl sulfonamide is added;
oil phase preparation: 25g of monomer acrylonitrile, 6g of octane, 0.5g of azodiisobutyronitrile, 8g of ethyl orthosilicate, 0.2g of polyacrylic acid and 3g of silane coupling KH-550 are uniformly stirred and mixed, an oil phase is dripped into a water phase within 1h at a constant speed by using a dropping funnel, then the oil phase is stirred at a high speed in an ice water bath to obtain a pre-emulsion, the pre-emulsion is transferred into a water bath kettle and is continuously stirred for 600 revolutions per minute under the protection of nitrogen, the temperature is raised to 60 ℃, and the reaction is carried out for 10h to prepare the water-based hollow emulsion.
Preparing aerogel:
respectively preparing 50% by mass of potassium phytate and 5% by mass of polyethylene glycol solution;
70 o c, slowly adding a potassium phytate solution into a polyethylene glycol solution under the conditions of reaction temperature and stirring, and centrifuging the obtained precipitate to obtain a potassium phytate-polyethylene glycol hydrogel, wherein the volume ratio of the potassium phytate solution to the polyethylene glycol solution is 10: 3;
freeze-drying the obtained hydrogel to obtain potassium phytate-polyethylene glycol aerogel;
and putting a proper amount of the prepared aerogel in a crucible, putting the crucible in a muffle furnace, heating to 350 ℃ at the heating rate of 5 ℃/min, maintaining for 2 hours, and then slowly cooling to room temperature at the cooling rate of 2 ℃/min to obtain the product, namely the phosphorus-containing carbon aerogel.
The invention further discloses an application of the water-based heat-insulating coating for the inner wall of the passenger car in improving the heat-insulating effect of the inner wall of the passenger car. In particular to effective application of the heat insulation effect of the coating film characterized by the determination of the thermal conductivity coefficient. Wherein said interior passenger vehicle wall insulation is adapted to include: coating workpieces such as large passenger cars, medium passenger cars, small passenger cars and the like. The experimental results show that: the water-based heat-insulating coating for the inner wall of the passenger car has an obvious heat-insulating effect on the passenger car, the heat conductivity coefficient of a coating film reaches below 0.5W/mK, the problem that the passenger car needs heat insulation when the passenger car runs outdoors for a long time under a high-temperature condition is solved, and meanwhile, the water-based coating VOC of the product reaches below 30g/L, so that the water-based heat-insulating coating has the effects of protecting passengers and increasing the comfort level. The water-based heat-insulating coating for the inner wall of the passenger car has the characteristics of smooth and fine appearance, low VOC (volatile organic compounds) emission, energy conservation and emission reduction, and achieves the purposes of energy conservation and emission reduction, environmental protection and reduction of harm to passengers while achieving excellent coating performance.
The invention further discloses a preparation method of the water-based heat-insulating coating for the inner wall of the passenger car, which comprises the following steps:
(1) adding deionized water, a dispersing agent, a defoaming agent and a wetting agent into a mixing tank in the formula, starting stirring, setting the rotating speed at 600 revolutions per minute, adding a film-forming assistant, titanium dioxide and an anti-settling agent under the stirring state, keeping stirring for 20 minutes, and stirring uniformly;
(2) adding a pH regulator into the batching tank according to the dosage of the formula, setting the rotating speed at 1000 rpm, and stirring for 10 minutes;
(3) discharging the paint slurry into a grinding basin, and grinding the paint slurry by a grinder until the fineness of the paint slurry is less than 30 mu m;
(4) taking out the grinding slurry after the grinding slurry is qualified, sequentially adding the aqueous hollow emulsion and the flatting agent under the stirring state of 1000 revolutions per minute and keeping stirring for 20 minutes.
(5) And (3) sequentially adding the glass beads and the aerogel into the uniformly stirred paint paste at 1300 rpm, keeping stirring for 20 minutes, adding the thickening agent after uniformly stirring, and adjusting the viscosity to be in a qualified range to obtain a finished product.
The invention mainly solves the problem that polyurethane foaming material products used for heat insulation of the inner wall of a passenger car are not environment-friendly, mainly considers the heat conductivity coefficient, VOC content and the like of a coating film, and has the main difficulties that the coating film is required to have good environment-friendly property, and the coating film is required to have very low heat conductivity coefficient so as to achieve good heat insulation effect, and simultaneously has very low solvent volatilization so as not to cause harm to human bodies.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications can be made in the components and amounts of the materials used in these embodiments without departing from the spirit and scope of the invention. The raw materials and reagents used in the present invention are commercially available.
Example 1
The main components of the coating are as follows:
raw material name and mass portion
Aqueous hollow emulsion 62
Dispersant 0.8
Wetting agent 0.8
Antifoam agent 0.6
Anti-settling agent 1.5
Hollow glass beads 18
Aerogel 1.0
pH regulator 0.15
Thickener RM-8W 0.55
Rutile titanium dioxide 10.0
film-Forming aid 1.5
Leveling agent 0.05
Deionized water 3.05
Wherein the raw materials are as follows:
aqueous hollow emulsion: self-made
Dispersing agent: kuaiyi dispersant
Wetting agent: CF-10
Defoaming agent: BYK-022 defoaming agent
Anti-settling agent: expanded water-based bentonite SHV
Hollow glass beads: c15
Aerogel: self-made
pH regulators: dimethylethanolamine
Thickening agent: 8W
Titanium dioxide: 706
Film-forming auxiliary agent: alcohol ester-12
Leveling agent: TEGO1488
Wherein:
preparation of aqueous hollow emulsion:
preparing a water phase: 200g of polyethanol are dissolved in 600g of deionized water at 40 ℃, 0.5g of dodecyl sulfonamide is added;
oil phase preparation: 25g of monomer acrylonitrile, 6g of octane, 0.5g of azodiisobutyronitrile, 8g of ethyl orthosilicate, 0.2g of polyacrylic acid and 3g of silane coupling KH-550 are uniformly stirred and mixed, an oil phase is dripped into a water phase within 1h at a constant speed by using a dropping funnel, then the oil phase is stirred at a high speed in an ice water bath to obtain a pre-emulsion, the pre-emulsion is transferred into a water bath kettle and is continuously stirred for 600 revolutions per minute under the protection of nitrogen, the temperature is raised to 60 ℃, and the reaction is carried out for 10h to prepare the water-based hollow emulsion.
Preparing aerogel:
respectively preparing 50% by mass of potassium phytate and 5% by mass of polyethylene glycol solution;
70 o c, slowly adding the potassium phytate solution into the polyethylene glycol solution under the conditions of reaction temperature and stirring, and centrifuging the obtained precipitate to obtain the potassium phytate-polyethylene glycol hydrogel, wherein the volume ratio of the potassium phytate solution to the polyethylene glycol solution is 10: 3;
freeze-drying the obtained hydrogel to obtain potassium phytate-polyethylene glycol aerogel;
and (3) putting a proper amount of the prepared aerogel in a crucible, putting the crucible in a muffle furnace, heating to 350 ℃ at a heating rate of 5 ℃/min, maintaining for 2 hours, and then slowly cooling to room temperature at a cooling rate of 2 ℃/min to obtain the product, namely the phosphorus-carbon-containing aerogel.
The preparation process of the water-based heat-insulating coating for the inner wall of the passenger car comprises the following steps:
(1) adding deionized water, a dispersing agent, a defoaming agent and a wetting agent into a mixing tank in the formula, starting stirring, setting the rotating speed at 600 revolutions per minute, adding a film-forming assistant, titanium dioxide and an anti-settling agent under the stirring state, keeping stirring for 20 minutes, and stirring uniformly;
(2) adding a pH regulator into the batching tank according to the dosage of the formula, setting the rotating speed at 1000 rpm, and stirring for 10 minutes;
(3) discharging the paint slurry into a grinding basin, and grinding the paint slurry by a grinder until the fineness of the paint slurry is less than 30 mu m;
(4) taking out the grinding slurry after the grinding slurry is qualified, sequentially adding the aqueous hollow emulsion and the flatting agent under the stirring state of 1000 revolutions per minute and keeping stirring for 20 minutes.
(5) And (3) sequentially adding the glass beads and the aerogel into the uniformly stirred paint paste at 1300 rpm, keeping stirring for 20 minutes, adding the thickening agent after uniformly stirring, and adjusting the viscosity to be in a qualified range to obtain a finished product.
The product is coated in a high-pressure airless spraying mode, and the performance of a coating film is tested:
TABLE 1 Main technical indices
TABLE 2 test results of the products
Example 2 (practical use)
The product prepared in the embodiment 1 is constructed by adopting a high-pressure airless spraying method, the product is sprayed to the periphery and the top of the inner wall of a bus, the spraying thickness is 1600 mu m, and the appearance of a coating film is smooth and fine; drying the surface of the coating film for 1 h; coating and drying for 24 h; the VOC content is 27.5g/L, and the product has no peculiar smell. The coating sample plate detects the acid resistance (0.05 mol/L H2SO 4) for 24h, has no defects of foaming, dropping, stickiness and the like, allows slight color change and is qualified; alkali resistance (25 ℃, 0.1mol/L NaOH) is 24h, defects such as foaming, dropping, stickiness and the like are avoided, slight color change is allowed, and the product is qualified; the oil resistance (0 # diesel oil) is 24h, the defects of foaming, falling, stickiness and the like are avoided, slight color change is allowed, and the product is qualified; the salt spray resistance is 360h, and the product is qualified; thermal conductivity coefficient (less than or equal to 0.05W/mK): 0.04210W/mK, qualified; the coating has no peculiar smell.
At present, polyurethane foaming materials are used for heat insulation of the inner wall of a passenger car, the spraying thickness of the materials is 500-3000 mu m, and the appearance of a coating film is rough and uneven; drying the surface of the coating film for 15 min; coating and drying for 24 h; the product has strong solvent smell. The acid resistance (25 ℃, 0.05mol/L H2SO 4) of the sample plate is 24h, the defects of foaming, falling, stickiness and the like are avoided, slight color change is allowed, and the sample plate is qualified; alkali resistance (25 ℃, 0.1mol/L NaOH) is 24h, defects such as foaming, dropping, stickiness and the like are avoided, slight color change is allowed, and the product is qualified; the oil resistance (0 # diesel oil) is 24h, the defects of foaming, falling, stickiness and the like are avoided, slight color change is allowed, and the product is qualified; the salt spray resistance is 360h, and the product is qualified; the heat conductivity coefficient is 0.04512W/mK, and the product is qualified; the coating film had a strong solvent odor.
And (4) conclusion: the water-based heat-insulating coating film for the inner wall of the passenger car sprayed by the invention has the characteristics of excellent heat-insulating effect with low heat conductivity coefficient, excellent protection effect with good medium resistance and salt spray resistance, self-drying, energy conservation and emission reduction of the film, low VOC content, excellent environmental protection, no peculiar smell of the product and the like. The passenger car coated with the inner wall water-based heat insulation coating for the passenger car has excellent heat insulation effect, is free from peculiar smell of a coating film, brings more comfortable feeling to a driver and passengers, and is an excellent substitute product of the inner wall polyurethane heat insulation material for the passenger car.
Although the present invention has been described in detail with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. And the invention is not limited to the embodiments of the examples given in the description.
Claims (2)
1. A preparation method of a water-based heat insulation coating for an inner wall of a passenger car is characterized by comprising the following raw materials in parts by weight:
name and part by mass of raw materials
Aqueous hollow emulsion 57
Dispersant 0.5
Wetting agent 0.4
Antifoam agent 0.3
Anti-settling agent 1.0
Hollow glass bead 15.0
Aerogels 1.5
pH regulator 0.1
Thickener 0.4
Rutile titanium dioxide 14.0
film-Forming aid 2.0
Leveling agent 0.08
Deionized water 7.72
Wherein the raw materials are as follows:
aqueous hollow emulsion: self-made
Dispersing agent: kuaiyi dispersant
Wetting agent: CF-10
Defoaming agent: BYK-022 defoaming agent
Anti-settling agent: expanded water-based bentonite SHV
Hollow glass beads: c15
Aerogel: self-made
pH regulator: dimethylethanolamine
Thickening agent: RM-8W
Titanium dioxide: 706
Film-forming auxiliary agent: alcohol ester-12
Leveling agent: TEGO1488
The preparation of the aqueous hollow emulsion comprises the following steps:
preparing a water phase: 200g of polyethanol are dissolved in 600g of deionized water at 40 ℃, 0.5g of dodecyl sulfonamide is added;
oil phase preparation: 25g of monomer acrylonitrile, 6g of octane, 0.5g of azodiisobutyronitrile, 8g of ethyl orthosilicate, 0.2g of polyacrylic acid and 3g of silane coupling agent KH-550 are uniformly stirred and mixed, an oil phase is dripped into a water phase within 1h at a constant speed by using a dropping funnel, then the oil phase is stirred at a high speed in an ice water bath to obtain a pre-emulsion, the pre-emulsion is transferred into a water bath kettle and is continuously stirred for 600 revolutions per minute under the protection of nitrogen, the temperature is raised to 60 ℃, and the reaction is carried out for 10h to prepare a water-based hollow emulsion;
preparing aerogel:
respectively preparing 50% by mass of potassium phytate and 5% by mass of polyethylene glycol solution;
70 o c, slowly adding the potassium phytate solution into the polyethylene glycol solution under the conditions of reaction temperature and stirring, and centrifuging the obtained precipitate to obtain the potassium phytate-polyethylene glycol hydrogel, wherein the volume ratio of the potassium phytate solution to the polyethylene glycol solution is 10: 3;
freeze-drying the obtained hydrogel to obtain potassium phytate-polyethylene glycol aerogel;
placing a proper amount of the prepared aerogel in a crucible, placing the crucible in a muffle furnace, heating to 350 ℃ at a heating rate of 5 ℃/min, maintaining for 2 hours, and then slowly cooling to room temperature at a cooling rate of 2 ℃/min to obtain a product, namely the phosphorus-carbon-containing aerogel;
the preparation method comprises the following steps:
(1) adding deionized water, a dispersing agent, a defoaming agent and a wetting agent into a mixing tank in the formula, starting stirring, setting the rotating speed at 600 revolutions per minute, adding a film-forming assistant, titanium dioxide and an anti-settling agent under the stirring state, keeping stirring for 20 minutes, and stirring uniformly;
(2) adding the pH regulator into a batching tank according to the dosage of the formula, setting the rotating speed at 1000 revolutions per minute and stirring for 10 minutes;
(3) discharging the paint slurry into a grinding basin, and grinding the paint slurry by a grinder until the fineness of the paint slurry is less than 30 mu m;
(4) taking out the grinding slurry after the grinding slurry is qualified, sequentially adding the aqueous hollow emulsion and the flatting agent under the stirring state of 1000 revolutions per minute and keeping stirring for 20 minutes;
(5) and (3) sequentially adding the glass beads and the aerogel into the uniformly stirred paint paste at 1300 rpm, keeping stirring for 20 minutes, adding the thickening agent after uniformly stirring, and adjusting the viscosity to be in a qualified range to obtain a finished product.
2. The application of the waterborne heat-insulating coating for the inner wall of the passenger car prepared by the method in claim 1 in improving the heat-insulating effect of the inner wall of the passenger car.
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