CN115975483A - Preparation method of self-repairing coating liquid and automobile paint surface protective film - Google Patents
Preparation method of self-repairing coating liquid and automobile paint surface protective film Download PDFInfo
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Abstract
The invention discloses a preparation method of coating liquid, in particular to a preparation method of self-repairing coating liquid, which comprises the steps of sequentially adding 700-750 parts of organic silicon modified self-repairing polyurethane elastomer, 10-18 parts of ultraviolet absorbent and 10-18 parts of light stabilizer into 1030-1100 parts of organic solvent, stirring for 30min, and uniformly mixing to obtain the self-repairing coating liquid. Meanwhile, the invention also provides an automobile paint surface protective film. The self-repairing coating obtained by curing the coating liquid has excellent self-repairing performance, scratches can be completely repaired under the heating condition of 50 ℃, and meanwhile, the coating liquid also has excellent flame retardant performance.
Description
Technical Field
The invention relates to a preparation method of a coating liquid, in particular to a preparation method of a self-repairing coating liquid, and also provides an automobile paint surface protective film.
Background
The car paint protective film, also called as 'invisible car cover', is a layer of transparent protective film stuck on the surface of a car body, can effectively prevent scratching and hitting of sand grains, also isolates the contact of car paint and air, and can prevent the corrosion of acid rain, insects, bird droppings and the like to the paint surface of the car body. The main purpose is that the original factory paint of the automobile can be bright as new after being torn off.
The existing car paint protective film is generally of a three-layer structure and sequentially comprises a self-repairing coating, a TPU substrate layer and a pressure-sensitive adhesive layer from outside to inside. The self-repairing coating is positioned on the outermost layer of the product, polyurethane materials are mostly adopted, and the self-repairing coating can self-repair under the heating condition after micro scratches are generated.
At present, the self-repairing layer on the surface is mostly concerned about the properties of repairing, stain resistance and the like, but the flame retardant property is not studied similarly. In fact, for polyurethane materials, the flame retardant property is poor, the combustion speed is high, excessive molten drops are generated in the process, the fire spread is easily accelerated, the self-repairing coating is most likely to contact open fire in daily use, and certain potential safety hazards exist. Therefore, the flame retardant performance level of the modified polyurethane coating can be improved by means of development of the modified polyurethane coating. In the state of the art, polyurethane materials can be modified in a suitable manner to include two types: the first method is to have flame retardant property by modifying polyurethane material through chemical intervention; the second method is to add the material with flame retardant property into the polyurethane material by means of physical intervention, but the second method is prone to problems such as poor compatibility. The invention adopts the organosilicon material to modify the polyurethane, and the organosilicon material has a series of characteristics and advantages of no corrosion, no toxicity, flame resistance, ozone resistance, weather aging resistance, electric insulation and the like, and has very good application value in the modification processing of polyurethane coating.
Accordingly, the present invention is provided.
Disclosure of Invention
The invention aims to provide a preparation method of a self-repairing coating liquid, and the self-repairing coating cured by the method has excellent flame resistance.
Another object of the present invention is to provide a flame-retardant protective film for automotive finishes.
In order to achieve the purpose, the preparation method of the self-repairing coating liquid provided by the invention adopts the following components in parts by weight:
700-750 parts of organosilicon modified self-repairing polyurethane elastomer, 10-18 parts of ultraviolet absorbent, 10-18 parts of light stabilizer and 1030-1100 parts of organic solvent;
the method comprises the following specific steps:
(1) Synthesis of liquid aminopropyl terminated polysiloxanes
Adding 100 parts of octamethylcyclotetrasiloxane and 7.35 parts of 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane into a glass container, carrying out ring-opening reaction by taking 0.62 part of tetramethylammonium hydroxide as a catalyst, carrying out the reaction in a dry nitrogen atmosphere at 105 ℃, after 18h of equilibrium reaction, heating the reaction system to 180 ℃ to degrade the catalyst, then cooling to 160 ℃, and carrying out pumping vacuum by using 10kPa circulating water to remove low-boiling-point small molecular impurities and other by-products to obtain colorless viscous liquid aminopropyl terminated polysiloxane; the synthesis reaction equation is shown in the following formula 1:
(2) Synthesis of liquid organosilicon modified self-repairing polyurethane elastomer
Firstly, sequentially adding 1.07 parts of hexamethylene diisocyanate, 1.06 parts of diphenylmethane-4, 4 '-diisocyanate, 0.05 part of dibutyltin dilaurate and 8 parts of tetrahydrofuran into a glass container, replacing nitrogen, isolating air by using a bubbler, gradually heating the system to 60 ℃ after the diphenylmethane-4, 4' -diisocyanate is uniformly dissolved, dropwise adding a constant-pressure dropping funnel into the tetrahydrofuran solution (16 g/16 mL) of the aminopropyl-terminated polysiloxane prepared in the step (1), fully reacting for 3 hours at 60 ℃ to obtain an isocyanate-terminated polydimethylsiloxane prepolymer solution, dissolving 0.58 part of 2, 6-diaminopyridine into 10 parts of tetrahydrofuran, slowly dropwise adding the 2, 6-diaminopyridine into the prepolymer solution to perform chain extension reaction, continuously reacting for 16 hours at 60 ℃, pouring the solution into a culture dish, standing for 24 hours to volatilize the solvent at room temperature, and drying for 12 hours at 40 ℃ in vacuum to obtain a precursor of the product liquid organosilicon-modified polyurethane elastomer in an organosilicon self-repairing tank; the synthesis reaction equation is shown in the following formulas 2-4:
according to pyridine function and Fe 3+ Adding a proper amount of ferric trichloride hexahydrate into a tetrahydrofuran solution (0.15 g/mL) of a precursor according to the mass ratio of 1: 1, fully stirring the solution at 50 ℃ for 1h to obtain a uniform solution system, then pouring the solution into a culture dish, standing at room temperature for 24h to volatilize the solvent, and then carrying out vacuum drying at 40 ℃ for 12h to obtain a final product, namely a liquid organosilicon-modified self-repairing polyurethane elastomer;
(3) Sequentially adding 700-750 parts of organic silicon modified self-repairing polyurethane elastomer, 10-18 parts of ultraviolet absorber and 10-18 parts of light stabilizer into 1030-1100 parts of organic solvent, stirring for 30min, and uniformly mixing to obtain the self-repairing coating liquid.
The ultraviolet absorbent is preferably one or a combination of at least two of TINUVIN 99-2, TINUVIN 384-2, TINUVIN 400, TINUVIN477, TINUVIN 900 and TINUVIN 1130. The self-repairing coating liquid can obstruct and absorb ultraviolet rays, greatly reduce the radiation intensity borne by the coating obtained after the self-repairing coating liquid is cured, and slow down the aging speed.
The light stabilizer is preferably one or a combination of at least two of TINUVIN 123, TINUVIN 144, TINUVIN 152, TINUVIN 249 and TINUVIN 292. The self-repairing coating can capture free radicals in the coating obtained after the self-repairing coating liquid is cured, block the chain reaction of light and oxygen aging, effectively protect the self-repairing coating, avoid yellowing, reduce glossiness and strengthen the weather resistance of the product.
The organic solvent is preferably one or a mixed solvent of butanone, methyl isobutyl ketone, toluene, xylene, ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate and dimethylacetamide in any proportion.
The coordination bond and the hydrogen bond in the cured polyurethane elastomer of the self-repairing coating liquid prepared by the method are reversible non-covalent bonds, and the siloxane main chain has excellent chain movement capability, so that the self-repairing coating liquid is endowed with excellent self-repairing performance.
Meanwhile, the cured coating molecules contain siloxane chain segment structures, so that the oxygen index of the material can be effectively improved, the carbon formation amount of the system after combustion can be increased, the heat release amount of the material is effectively reduced, and the purpose of improving the flame retardant property is realized.
In addition, the invention also provides an automobile paint surface protective film which comprises a self-repairing coating obtained by curing the coating liquid, a TPU substrate layer and a pressure-sensitive adhesive layer; the self-repairing coating, the TPU base material layer and the pressure-sensitive adhesive layer are sequentially compounded.
The thickness of the self-repairing coating is preferably 6-12 μm.
The TPU substrate layer is preferably an aliphatic TPU substrate layer, the thickness of the TPU substrate layer is 100-300 mu m, the surface hardness of the TPU substrate layer is 80-93A, and the elongation at break is more than 300%.
The pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer or a polyurethane pressure-sensitive adhesive layer, and the thickness of the pressure-sensitive adhesive layer is 10-50 mu m.
The automobile paint surface protective film is preferably formed by further compounding a release film layer on the surface of one side, deviating from the TPU substrate layer, of the pressure-sensitive adhesive layer. The release film layer is preferably a PET release film layer, the thickness is 23-100 mu m, and the release force is within 20 g/inch.
In addition, the invention also provides a preparation method of the car paint protective film, which can adopt a process of firstly coating the pressure-sensitive adhesive layer and then coating the self-repairing coating, and comprises the following specific steps:
coating a pressure-sensitive adhesive solution on a release film layer, drying at 80-120 ℃ for 2-3 min to form a pressure-sensitive adhesive layer, and then laminating the pressure-sensitive adhesive layer and a TPU substrate layer;
coating self-repairing coating liquid on the reverse side of the TPU substrate layer in the step one, wherein the curing condition is 80-150 ℃ and 2-4 min, so as to form a self-repairing coating;
and step three, curing the semi-finished product obtained in the step two under the curing condition of 40-60 ℃ for 24-72 hours to obtain a self-repairing vehicle paint protective film finished product.
The coating mode in the preparation scheme is preferably roller coating, slit coating or comma blade coating.
Compared with the prior art, the invention has the beneficial effects that:
the self-repairing coating obtained by curing the coating liquid has excellent self-repairing performance, scratches on the surface can be completely repaired under the heating condition of 50 ℃, and the coating liquid also has excellent flame retardant property. In addition, the polyurethane elastomer in the coating material of the invention can obtain excellent mechanical properties by crosslinking through polycondensation, copolymerization, hydrosilylation and the like, and other properties such as hydrophobicity, chemical resistance, high and low temperature resistance and biocompatibility are also very excellent.
The surface of the protective film for the automobile paint surface adopts the self-repairing coating, so that the surface of the protective film for the automobile paint surface has excellent self-repairing performance and flame retardant performance.
Drawings
FIG. 1 is a schematic view of a layered structure of a protective film for an automotive finish.
In the figure: self-repairing coating 1, TPU substrate layer 2, pressure sensitive adhesive layer 3, release film layer 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example 1:
the preparation method of the self-repairing coating liquid provided by the embodiment adopts the following components in parts by weight:
700 parts of organic silicon modified self-repairing polyurethane elastomer, 10 parts of ultraviolet absorber, 10 parts of light stabilizer and 1030 parts of organic solvent;
the method comprises the following specific steps:
(1) Synthesis of liquid aminopropyl terminated polysiloxanes
Adding 100 parts of octamethylcyclotetrasiloxane (Dow Corning Co.) and 7.35 parts of 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane (Shanghaineri fine chemicals Co., ltd.) into a glass container, carrying out ring-opening reaction by using 0.62 part of tetramethylammonium hydroxide as a catalyst, carrying out the reaction in a dry nitrogen atmosphere at 105 ℃, after 18 hours of equilibrium reaction, heating the reaction system to 180 ℃ to degrade the catalyst, then cooling to 160 ℃, and carrying out vacuum pumping by using 10kPa circulating water to remove low-boiling-point small molecular impurities and other by-products to obtain colorless viscous liquid aminopropyl terminated polysiloxane; the synthesis reaction equation is shown in the following formula 1:
(2) Synthesis of liquid organosilicon modified self-repairing polyurethane elastomer
Firstly, sequentially adding 1.07 parts of hexamethylene diisocyanate, 1.06 parts of diphenylmethane-4, 4 '-diisocyanate, 0.05 part of dibutyltin dilaurate and 8 parts of tetrahydrofuran (Adamas reagent Co., ltd.) into a glass container, replacing nitrogen, isolating air by using a bubbler, gradually heating the system to 60 ℃ after the diphenylmethane-4, 4' -diisocyanate is uniformly dissolved, dropwise adding a constant-pressure dropping funnel into a tetrahydrofuran solution (16 g/16 mL) of aminopropyl-terminated polysiloxane prepared in the step (1), fully reacting for 3 hours at 60 ℃ to obtain an isocyanate-terminated polydimethylsiloxane prepolymer solution, dissolving 0.58 part of 2, 6-diaminopyridine (Shanghai Arlatin Biochemical Co., ltd.) into 10 parts of tetrahydrofuran, slowly dropwise adding the solution into the prepolymer solution to perform chain extension reaction, continuously reacting for 16 hours at 60 ℃, pouring the solution into a culture dish, placing the culture dish into a volatile solvent at room temperature for 24 hours, then drying the solution in a vacuum oven at 40 ℃ to obtain a self-repairing organic silicon modified polyurethane elastomer product, and obtaining the polyurethane; the synthesis reaction equation is shown in the following formula 2-4:
according to pyridine function and Fe 3+ Adding a proper amount of ferric trichloride hexahydrate into a tetrahydrofuran solution (0.15 g/mL) of a precursor according to the mass ratio of 1: 1, fully stirring the solution at 50 ℃ for 1h to obtain a uniform solution system, then pouring the solution into a culture dish, standing at room temperature for 24h to volatilize the solvent, and then carrying out vacuum drying at 40 ℃ for 12h to obtain a final product, namely a liquid organosilicon-modified self-repairing polyurethane elastomer;
(3) And sequentially adding 700 parts of organic silicon modified self-repairing polyurethane elastomer, 10 parts of ultraviolet absorbent and 10 parts of light stabilizer into 1030 parts of organic solvent, stirring for 30min, and uniformly mixing to obtain the self-repairing coating liquid.
The embodiment also provides an automobile paint surface protective film, which comprises a self-repairing coating 1 with the thickness of 6 microns, a TPU substrate layer 2 with the thickness of 150 microns, a pressure-sensitive adhesive layer 3 with the thickness of 25 microns and a release film layer 4 with the thickness of 75 microns as shown in figure 1. The self-repairing coating, the TPU substrate layer, the pressure-sensitive adhesive layer and the release film layer are sequentially compounded together.
The preparation method of the automobile paint protective film comprises the following specific steps:
step one, coating a pressure-sensitive adhesive solution (Henkel, loctite 8087) on the single-side surface of a white PET release film (Toray, XZ31 SR) with the thickness of 75 microns, drying at 110 ℃ for 2min to form a pressure-sensitive adhesive layer with the dry adhesive thickness of 25 microns, and then covering the pressure-sensitive adhesive layer on one side surface of a TPU (Argotec 49510) base material layer with the thickness of 150 microns;
coating self-repairing coating liquid on the other side surface of the TPU substrate layer in the first step, wherein the curing condition is 120 ℃, the curing time is 2min, and the thickness of the dried self-repairing coating is 6 micrometers;
and step three, putting the semi-finished product in the step two into a curing chamber at 50 ℃, and obtaining the self-repairing automobile paint surface protective film after 72 hours.
Example 2:
the preparation method of the self-repairing coating liquid provided by the embodiment adopts the following components in parts by weight:
750 parts of organic silicon modified self-repairing polyurethane elastomer, 18 parts of ultraviolet absorber, 18 parts of light stabilizer and 1100 parts of organic solvent;
wherein the specific steps (1) and (2) are the same as those in example 1;
and (4) sequentially adding 750 parts of organic silicon modified self-repairing polyurethane elastomer, 18 parts of ultraviolet absorber and 18 parts of light stabilizer into 1100 parts of organic solvent in the step (3), stirring for 30min, and uniformly mixing to obtain the self-repairing coating liquid.
The embodiment also provides an automobile paint protective film, the laminated structure and the preparation method thereof are substantially the same as those in the foregoing embodiment 1, and the thickness of the self-repairing coating in this embodiment is only 8 μm.
Example 3:
the preparation method of the self-repairing coating liquid provided by the embodiment adopts the following components in parts by weight:
720 parts of organosilicon modified self-repairing polyurethane elastomer, 15 parts of ultraviolet absorber, 15 parts of light stabilizer and 1050 parts of organic solvent;
wherein the specific steps (1) and (2) are the same as those in example 1;
in the step (3), 720 parts of organic silicon modified self-repairing polyurethane elastomer, 15 parts of ultraviolet absorbent and 15 parts of light stabilizer are sequentially added into 1050 parts of organic solvent, stirred for 30min and uniformly mixed to obtain the self-repairing coating liquid.
The embodiment also provides an automobile paint protective film, the layered structure and the preparation method of which are substantially the same as those in embodiment 1, except that the thickness of the self-repairing coating layer in this embodiment is 12 μm, the thickness of the TPU substrate layer is 300 μm, the thickness of the pressure-sensitive adhesive layer is 50 μm, and the thickness of the release film layer is 100 μm.
Example 4:
the preparation method of the self-repairing coating liquid provided in this embodiment is completely the same as that in the foregoing embodiment 3.
The embodiment also provides an automobile paint protective film, the layered structure and the preparation method of which are substantially the same as those in embodiment 1, except that the thickness of the self-repairing coating layer in this embodiment is 10 μm, the thickness of the TPU substrate layer is 100 μm, the thickness of the pressure-sensitive adhesive layer is 10 μm, and the thickness of the release film layer is 23 μm.
Comparative example 1:
a preparation method of an automobile paint protective film comprises the following steps:
(1) Preparation of self-repairing coating liquid
Sequentially adding 860 parts of polycaprolactone polyol resin (Daicel ChemTech, PLACCEL 210 CP), 20 parts of stannous isooctanoate (Allantin chemical reagent net), 15 parts of TINUVIN 400 (BASF), 15 parts of TINUVIN 292 (BASF) and 10 parts of BYK 320 (BYK) into 1000 parts of ethyl acetate, finally adding 150 parts of isocyanate curing agent toluene diisocyanate (BASF), stirring for 30min, and uniformly mixing to obtain a self-repairing coating liquid;
(2) Coating pressure sensitive adhesive layer
Coating a pressure-sensitive adhesive solution (Henkel, loctite 8087) on one side surface of a white PET (Toray, XZ31 SR) release film (Toray, XZ) with the thickness of 75 mu m, drying at 110 ℃ for 2min to form a pressure-sensitive adhesive layer with the dry adhesive thickness of 25 mu m, and then covering the pressure-sensitive adhesive layer on one side surface of a TPU (Argotec 49510) base material layer with the thickness of 150 mu m;
(3) Coating self-repairing coating liquid
Coating the self-repairing coating liquid of the first step on the surface of the other side of the TPU substrate layer in the second step, wherein the curing condition is 120 ℃, the curing time is 2min, and the thickness of the dried coating is 8 mu m;
(4) Late stage curing
And (4) putting the semi-finished product in the third step into a curing chamber at the temperature of 50 ℃, and carrying out 72 hours to obtain the self-repairing automobile paint surface protective film.
Comparative example 2:
a preparation method of an automobile paint protective film comprises the following steps:
(1) Preparation of self-repairing coating liquid
Adding 1200 parts of polycarbonate polyol resin (Daicel ChemTech, PLACCEL 220 CPB), 26 parts of stannous isooctanoate (alatin chemical reagent net), 20 parts of TINUVIN 400 (BASF), 20 parts of TINUVIN 292 (BASF) and 13 parts of BYK 320 (BYK) into 1200 parts of ethyl acetate in sequence, finally adding 100 parts of isocyanate curing agent hexamethylene diisocyanate (BASF), and stirring for 30min to obtain a self-repairing coating liquid;
steps (2) to (4) in this comparative example were completely the same as those in comparative example 1.
The following table shows the flame retardant rating and self-healing temperature test data for the skin (self-healing coating) of the samples of examples 1-4 and comparative examples 1 and 2.
| Self-repairing temperature | Grade of combustion | |
| Example 1 | 50℃ | B |
| Example 2 | 50℃ | B |
| Example 3 | 50℃ | B |
| Example 4 | 50℃ | B |
| Comparative example 1 | 70℃ | D |
| Comparative example 2 | 70℃ | D |
According to the test data, the surface of the automobile paint protective film improves the flame retardant grade, and meanwhile, the self-repairing performance of the automobile paint protective film is obviously improved.
The test method for the self-healing temperature in the above table is as follows:
pressing the surface of No. 0000 steel wire velvet by using a 2kg weight, reciprocating for 3 times on the surface of a self-repairing coating of the paint surface protective film, then placing the paint surface protective film at different temperatures (40 ℃,50 ℃,60 ℃,70 ℃ and 80 ℃) for 5min, recording the temperature as a self-repairing temperature if the paint surface protective film can be completely repaired, and if the paint surface protective film cannot be completely repaired, raising the temperature by 10 ℃ to repeat the test.
Flame retardant rating test the flame retardant rating of the material was determined by recording the burning distance and determining the flame retardant rating according to the test method of GB8410-2010 automotive interior material's burning characteristics, with the rating from A to E, with A being the best and E being the worst.
The present invention is not limited to the above preferred embodiments, and any other various products can be obtained by anyone in light of the present invention, but any changes in shape or structure thereof, which are similar or identical to the technical solution of the present invention, fall within the protection scope of the present invention.
Claims (2)
1. A preparation method of a self-repairing coating liquid is characterized by comprising the following components in parts by weight:
700-750 parts of organic silicon modified self-repairing polyurethane elastomer, 10-18 parts of ultraviolet absorber, 10-18 parts of light stabilizer and 1030-1100 parts of organic solvent;
the method comprises the following specific steps:
(1) Synthesis of liquid aminopropyl terminated polysiloxanes
Adding 100 parts of octamethylcyclotetrasiloxane and 7.35 parts of 1, 3-bis (3-aminopropyl) -1, 3-tetramethyldisiloxane into a glass container, carrying out ring-opening reaction by taking 0.62 part of tetramethylammonium hydroxide as a catalyst, carrying out the reaction in a dry nitrogen atmosphere at 105 ℃, after 18h of equilibrium reaction, heating the reaction system to 180 ℃ to degrade the catalyst, then cooling to 160 ℃, and carrying out pumping vacuum by using 10kPa circulating water to remove low-boiling-point small molecular impurities and other by-products to obtain colorless viscous liquid aminopropyl terminated polysiloxane;
(2) Synthesis of liquid organosilicon modified self-repairing polyurethane elastomer
Firstly, sequentially adding 1.07 parts of hexamethylene diisocyanate, 1.06 parts of diphenylmethane-4, 4 '-diisocyanate, 0.05 part of dibutyltin dilaurate and 8 parts of tetrahydrofuran into a glass container, replacing nitrogen, isolating air by using a bubbler, gradually heating the system to 60 ℃ after the diphenylmethane-4, 4' -diisocyanate is uniformly dissolved, dropwise adding a constant-pressure dropping funnel into the tetrahydrofuran solution (16 g/16 mL) of the aminopropyl-terminated polysiloxane prepared in the step (1), fully reacting for 3 hours at 60 ℃ to obtain an isocyanate-terminated polydimethylsiloxane prepolymer solution, dissolving 0.58 part of 2, 6-diaminopyridine into 10 parts of tetrahydrofuran, slowly dropwise adding the 2, 6-diaminopyridine into the prepolymer solution to perform chain extension reaction, continuously reacting for 16 hours at 60 ℃, pouring the solution into a culture dish, standing for 24 hours to volatilize the solvent at room temperature, and drying for 12 hours at 40 ℃ in vacuum to obtain a precursor of the product liquid organosilicon-modified polyurethane elastomer in an organosilicon self-repairing tank;
according to pyridine function and Fe 3+ Adding a proper amount of ferric trichloride hexahydrate into a tetrahydrofuran solution (0.15 g/mL) of a precursor according to the mass ratio of 1: 1, fully stirring the solution at 50 ℃ for 1h to obtain a uniform solution system, then pouring the solution into a culture dish, standing at room temperature for 24h to volatilize a solvent, and then carrying out vacuum drying at 40 ℃ for 12h to obtain a final product, namely a liquid organic silicon modified self-repairing polyurethane elastomer;
(3) Sequentially adding 700-750 parts of organic silicon modified self-repairing polyurethane elastomer, 10-18 parts of ultraviolet absorbent and 10-18 parts of light stabilizer into 1030-1100 parts of organic solvent, stirring for 30min, and uniformly mixing to obtain the self-repairing coating liquid.
2. An automobile finish protective film, characterized by comprising a self-healing coating layer obtained by curing a coating liquid according to claim 1, a TPU substrate layer and a pressure-sensitive adhesive layer; the self-repairing coating, the TPU base material layer and the pressure-sensitive adhesive layer are sequentially compounded.
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| CN113831493A (en) * | 2021-09-27 | 2021-12-24 | 中国科学院宁波材料技术与工程研究所 | Self-repairing polyurethane elastomer containing six-fold intermolecular hydrogen bonds and preparation method thereof |
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