A sprayable liquid car finish composition, a sprayable car finish and a method of making the same

Abstract

The application specifically discloses a kind of spraying liquid car paint film composition, spraying car paint film and preparation method thereof.The spraying liquid car paint film composition at least includes isocyanate prepolymer and imine resin;The isocyanate prepolymer is selected from aliphatic isocyanate prepolymer and / or alicyclic isocyanate elastic prepolymer;The imine resin is selected from aliphatic imine resin and / or alicyclic imine resin;And, at least one of isocyanate prepolymer and imine resin contains alicyclic structure.The application uses imine resin and isocyanate prepolymer and other components to obtain a coating with high strength, high elongation, extremely strong weather resistance, which not only has good adhesion between smooth car paint, but also has extremely high tensile strength, weather resistance and tear strength, can realize whole piece peeling, and has stronger peelability, better convenience of replacement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spray-on car film, and more particularly, to a spray-on liquid car film composition, a spray-on car film and a preparation method thereof. BACKGROUND

[0002] Car film is a kind of high polymer material film used for protecting the car body. It is usually made of polyurethane, polyethylene, polyvinyl chloride and other materials, and has the characteristics of wear resistance, scratch resistance, ultraviolet resistance, and pollution resistance. Car film can be pasted on the surface of the car body to form a protective layer, effectively preventing the car paint from being damaged by external factors, while maintaining the gloss of the car body. In addition, car film can also be customized with different colors and patterns to add personalized elements to the car body.

[0003] Traditional car film generally needs to be pre-fabricated into a film by a factory. The general process is: master batch smelting → casting film → back glue process → coating process. Not only is the process complicated and the cost is high, but the car film also needs to be sold in the form of a whole roll, which is wasteful after being pasted on the car body and then cut. In addition, the working hours for pasting the car film are long, and the skill of the workers is also required to be high, which is prone to cause drumming and delamination due to operation problems. Therefore, more and more people begin to use spray-on car film instead of traditional factory pre-fabricated film.

[0004] At present, the paint used for spray-on car film mostly uses water-based polyurethane as the main component, but it usually has problems such as slow drying speed, low strength, poor water resistance, etc. Polyurea is a kind of high polymer compound generated by the reaction of isocyanate component and amino compound component. Because it has good corrosion resistance, water resistance, wear resistance, and aging resistance, it has gradually attracted people's attention. People have found that using polyurea instead of water-based polyurethane can make the performance of spray-on car film more excellent.

[0005] Commonly used polyurea includes aromatic spray-on polyurea and steric secondary amine aspartate polyurea. However, these two kinds of polyurea have the following problems respectively: the aromatic amino component and isocyanate of spray-on polyurea are cross-linked and cured after spraying. Because the reaction speed is extremely fast, the coating is cured before it has time to wet the inside of the substrate, resulting in a poor surface effect and low adhesion of the obtained coating, and poor weather resistance, which cannot be directly applied to civilian car film. Although the steric secondary amine aspartate polyurea has a moderate curing speed and good adhesion, the mechanical properties such as tensile strength and tear strength of the obtained coating are not high, making it difficult for the coating to be peeled off in one piece, and the peelability is poor, which affects the convenience of replacing the car film. SUMMARY

[0006] In order to solve the above technical problems, the present application provides a spray-on liquid car film composition, a spray-on car film and a preparation method thereof.

[0007] In a first aspect, the application provides a liquid sprayable car coating film composition, which uses the following technical solution:

[0008] The liquid sprayable car coating film composition comprises A component and B component, wherein the raw materials used in the A component include 10-40 parts of isocyanate prepolymer; the raw materials used in the B component include 5-20 parts of imine resin and 0-20 parts of polyaspartic ester resin; the isocyanate prepolymer is selected from aliphatic isocyanate prepolymer and / or alicyclic isocyanate elastic prepolymer; the imine resin is selected from aliphatic imine resin and / or alicyclic imine resin; the polyaspartic ester resin is selected from aliphatic polyaspartic ester resin and / or alicyclic polyaspartic ester resin; and at least one of the isocyanate prepolymer, the imine resin and the polyaspartic ester resin contains alicyclic structure when the A component and the B component are used in combination.

[0009] Optionally, the aliphatic isocyanate elastic prepolymer is obtained by polymerization of aliphatic isocyanate monomer and at least one of polyol and polyaspartic ester resin.

[0010] Optionally, the aliphatic isocyanate monomer is selected from at least one of hexamethylene diisocyanate, hexamethylene diisocyanate trimer, 1,5-pentane diisocyanate, 1,5-pentane diisocyanate trimer and trimethyl hexane diisocyanate.

[0011] Optionally, the polyol includes dihydric alcohol, and the dihydric alcohol has an average molecular weight of 62-3000.

[0012] More specifically, the dihydric alcohol is selected from at least one of polyester diol, polycaprolactone diol, polycarbonate diol, polytetrahydrofuran diol and chain aliphatic diol with 1-18 carbon atoms. If some properties of the isocyanate prepolymer are further optimized, other alcohols other than dihydric alcohol can also be added to the polyol as a molecular weight regulator, a functionality regulator or a chain extender, etc.

[0013] The aliphatic isocyanate elastic prepolymer is prepared by the following method: the reaction raw materials are incubated at a temperature of 60-90℃ for 5-9 hours to obtain the aliphatic isocyanate elastic prepolymer with a NCO content of 2-10%. The polymerization reaction can also selectively add a solvent, which is denoted as the first solvent in the application. The polymerization reaction can also selectively add a catalyst to assist the polymerization reaction, which is denoted as the first catalyst in the application.

[0014] Optionally, the first solvent is selected from one of aliphatic organic solvent, aromatic hydrocarbon organic solvent, aralkyl organic solvent, ester organic solvent, ether organic solvent and ketone organic solvent.

[0015] More specifically, the first solvent is selected from at least one of toluene, xylene, acetone, butanone, ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol diacetate, propylene glycol methyl ether acetate, methyl 3-methoxypropionate, and ethyl 3-ethoxypropionate.

[0016] Optionally, the first catalyst is an organic bismuth catalyst.

[0017] Optionally, the alicyclic isocyanate elastomeric prepolymer is polymerized from an alicyclic isocyanate monomer and at least one of a polyol, a polyaspartic resin.

[0018] Optionally, the alicyclic isocyanate monomer is selected from at least one of isophorone diisocyanate, isophorone diisocyanate trimer, dicyclohexylmethane diisocyanate, cyclohexane dimethylene diisocyanate.

[0019] The alicyclic isocyanate elastomeric prepolymer is prepared in the same manner as the aliphatic isocyanate elastomeric prepolymer.

[0020] Optionally, the aliphatic imine resin is obtained by reacting an aliphatic diamine with at least one of a ketone compound, an aldehyde compound.

[0021] Optionally, the aliphatic diamine is selected from at least one of pentanediamine, 2-methyl-1,5-pentanediamine, hexanediamine, trimethylhexanediamine.

[0022] Optionally, the ketone compound is selected from at least one of acetone, butanone, methyl isobutyl ketone, methyl isopentyl ketone, methyl isopropyl ketone.

[0023] Optionally, the aldehyde compound is selected from at least one of benzaldehyde, phenylacetaldehyde, n-butyraldehyde, isobutyraldehyde, isovaleraldehyde, 2,2-dimethyl-3-lauryloxypropanal.

[0024] The aliphatic imine resin is prepared by dehydrating and condensing the reaction raw materials at a temperature of 90-120°C for 12-24 hours.

[0025] Optionally, the alicyclic imine resin is obtained by reacting an alicyclic diamine with at least one of a ketone compound, an aldehyde compound.

[0026] Optionally, the alicyclic diamine is selected from at least one of 4,4'-diaminodicyclohexylmethane, 3,3'-dimethyl-4,4-diaminodicyclohexylmethane, isophorone diamine, methylcyclohexanediamine, cyclohexanediamine, 1,3-cyclohexanedimethylamine.

[0027] The alicyclic imine resin is prepared in the same manner as the aliphatic imine resin.

[0028] The preparation method of the aliphatic polyaspartic ester resin comprises the following steps: addition reaction of aliphatic diamine and one of maleate and fumarate at a temperature of 70-10℃ for 12-48 hours.

[0029] The preparation method of the aliphatic polyaspartic ester resin further comprises the following steps: dehydration condensation of the obtained product after the addition reaction and at least one of ketone compound and aldehyde compound at a temperature of 90-120℃ for 12-24 hours.

[0030] Optionally, the maleate is at least one of dimethyl maleate, diethyl maleate, di-n-butyl maleate and diisooctyl maleate.

[0031] Optionally, the fumarate is at least one of dimethyl fumarate, diethyl fumarate, dipropyl fumarate and dibutyl fumarate.

[0032] The alicyclic polyaspartic ester resin is prepared by the same method as the aliphatic polyaspartic ester resin except that the aliphatic diamine is replaced by alicyclic diamine.

[0033] By the above technical solution, the imine resin is hydrolyzed and cured with the isocyanate prepolymer to prepare a coating layer with high strength, high elongation and strong weather resistance. The introduction of the rigid alicyclic structure further improves the strength of the coating layer, so that the coating layer has good tearability and high tear strength. When the car film needs to be replaced, the coating layer can be peeled off in whole, has strong peelability and greatly improves the convenience of replacing the car film. Meanwhile, the imine resin is combined with the isocyanate prepolymer and the polyaspartic ester resin to significantly reduce the reaction speed between the amino compound component and the isocyanate component, adjust the drying speed, make the coating fully wet the inside of the substrate, and thus improve the adhesion between the cured coating layer and the car paint. It is detected that the pull-off adhesion between the coating layer formed by the spraying liquid car film composition of the application and the smooth car paint surface can reach 3-5 MPa.

[0034] Preferably, when the A component and the B component are used in mixture, at least two of the isocyanate prepolymer, the imine resin and the polyaspartic ester resin contain alicyclic structure.

[0035] Preferably, when the A component and the B component are used in mixture, all of the isocyanate prepolymer, the imine resin and the polyaspartic ester resin contain alicyclic structure.

[0036] By the above technical solution, the minimum introduction amount of the alicyclic structure is optimized, and the mechanical strength of the coating layer is further enhanced, so that the peelability of the coating layer is further improved.

[0037] Preferably, the A component further comprises 1-10 parts by weight of isocyanate monomers, which are alicyclic isocyanate monomers.

[0038] By the above technical solution, the isocyanate monomers with rigid alicyclic structure are used together with the isocyanate prepolymer and the imine resin and other components in the B component for curing, which further improves the mechanical strength of the coating and thus improves the peelability of the coating.

[0039] Preferably, the spray liquid car paint film composition further comprises at least one of defoaming agent, leveling agent, anti-sagging aid, ultraviolet absorber, second catalyst, second solvent, and color paste.

[0040] Optionally, the defoaming agent is 0-1 parts by weight, the leveling agent is 0-1 parts by weight, the anti-sagging aid is 0-1 parts by weight, the ultraviolet absorber is 0-3 parts by weight, the second catalyst is 0-3 parts by weight, the second solvent is 0-60 parts by weight, and the color paste is 0-20 parts by weight.

[0041] By the above technical solution, when the above substances need to be added, these substances can be added to the A component, the B component, or separately form a C component and be mixed with the A component and the B component in any combination, as known to those skilled in the art. In the specific embodiments of the present application, the above substances are added to the A component and the B component as an example.

[0042] Optionally, the defoaming agent is selected from one of polyether type defoaming agent, silicone type defoaming agent, and polyether modified silicone defoaming agent. Preferably, the defoaming agent is a polyether type defoaming agent. More specifically, the polyether type defoaming agent is one of BYK1790, BYK054, and BYK052.

[0043] By using the above technical solution, the polyether type defoaming agent, the silicone type defoaming agent, and the polyether modified silicone defoaming agent can all achieve good defoaming effect. Among them, the polyether type defoaming agent has moderate lipophilicity and hydrophilicity, high defoaming rate, and good compatibility in the polyaspartic acid resin system and the polyurea system, and the prepared coating has better appearance.

[0044] Optionally, the leveling agent is a polyacrylate leveling agent or a fluorocarbon modified polyacrylate leveling agent.

[0045] Preferably, the leveling agent is one of BYK354, BYK399, and EFKA3600.

[0046] By using the above technical solution, the three leveling agents of BYK354, BYK399, and EFKA3600 have better compatibility with the polyaspartic acid resin, so that the leveling of the coating is better, and the gloss of the prepared coating is higher.

[0047] Optionally, the anti-sagging auxiliary agent is BYK410.

[0048] Optionally, the ultraviolet absorber is UV1130 or UV292.

[0049] Optionally, the second catalyst is selected from one of an organic bismuth catalyst, an acid catalyst. The acid catalyst is selected from at least one of an inorganic acid catalyst, an organic acid catalyst, and a Lewis acid catalyst.

[0050] More specifically, the second catalyst is selected from one of phosphoric acid, lactic acid, glacial acetic acid, citric acid, lauric acid, oxalic acid, and dodecylbenzenesulfonic acid.

[0051] Optionally, the second solvent is selected from one of an alkane organic solvent, an aromatic hydrocarbon organic solvent, an aralkane organic solvent, an ester organic solvent, an ether organic solvent, and a ketone organic solvent.

[0052] More specifically, the second solvent is selected from one of toluene, xylene, acetone, butanone, ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol diacetate, propylene glycol methyl ether acetate, 3-methoxypropyl acetate, and 3-ethoxypropyl acetate.

[0053] Preferably, the color paste is prepared from at least one of polyaspartic acid ester resin and imine resin, an anti-settling agent, a dispersant, a pigment, and a third solvent.

[0054] Optionally, the polyaspartic acid ester resin is 0-60 parts, the imine resin is 0-60 parts, the anti-settling agent is 0.1-1 parts, the dispersant is 1-10 parts, the pigment is 10-70 parts, and the third solvent is 0-20 parts by weight.

[0055] The preparation method of the color paste is mixing all components and high-speed dispersing at a rotation speed of 1000-1500 r / min for 30-40 minutes, and then grinding to a fineness of less than 20 μm.

[0056] Optionally, the anti-settling agent is BYK163.

[0057] Optionally, the dispersant is fumed silica R972 or polyamide wax 6900-20X.

[0058] Optionally, the pigment is selected from one of inorganic pigments, pearl pigments, and organic pigments. The inorganic pigments include, but are not limited to, diamond titanium white, carbon black, red iron oxide, and iron yellow.

[0059] Optionally, the third solvent is selected from one of an alkane organic solvent, an aromatic hydrocarbon organic solvent, an aralkane organic solvent, an ester organic solvent, an ether organic solvent, and a ketone organic solvent.

[0060] More specifically, the third solvent is selected from at least one of toluene, xylene, acetone, butanone, ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol diacetate, propylene glycol methyl ether acetate, methyl 3-methoxypropionate, and ethyl 3-ethoxypropionate.

[0061] By the above technical solution, the color paste prepared by mixing polyaspartic acid ester resin or imine resin with pigment and other components has excellent weather resistance and good compatibility with the polyurea coating of the application, and is easy to disperse uniformly in the polyurea coating of the application.

[0062] In the second aspect, the application provides a sprayable car film, which comprises a protective layer formed by curing a sprayable liquid car film composition on a car paint surface.

[0063] By the above technical solution, the sprayable car film of the application not only has good adhesion between the smooth car paint, but also has excellent mechanical strength and weather resistance, and can realize whole piece peeling, and has high convenience of replacement.

[0064] Preferably, the outer surface of the protective layer is further provided with a topcoat layer, and the topcoat layer is an acrylic resin layer or a polyaspartic acid ester polyurea layer.

[0065] By the above technical solution, the application further provides a topcoat layer on the outer surface of the protective layer, which can further enhance the gloss, hardness, scratch resistance and other properties of the sprayable car film. The acrylic resin layer is formed by curing an acrylic resin coating. The polyaspartic acid ester polyurea layer is formed by curing a polyaspartic acid ester polyurea coating. The topcoat layers formed by the above two coatings both have excellent fullness, gloss, weather resistance and gloss and color retention. In the specific embodiments of the application, the polyaspartic acid ester polyurea coating is taken as an example for illustration.

[0066] Preferably, a color adjusting layer is further arranged between the protective layer and the topcoat layer, and the color adjusting layer is selected from at least one of a solid color paint layer, a metallic paint layer, or a pearl paint layer.

[0067] Optionally, the solid color paint layer is formed by curing one of a polyaspartic acid ester type solid color coating, a polyurethane type solid color coating, and an acrylic ester type solid color coating. The color of the solid color paint layer can be adjusted according to actual needs.

[0068] Optionally, the metallic paint layer is formed by curing one of a polyaspartic acid ester type metallic coating, a polyurethane type metallic coating, and an acrylic ester type metallic coating. The color of the metallic paint layer can be adjusted according to actual needs.

[0069] Optionally, the pearlescent paint layer is formed by curing one of a polyaspartic ester type pearlescent paint, a polyurethane type pearlescent paint, and an acrylate type pearlescent paint. The color of the pearlescent paint layer can be adjusted according to actual needs.

[0070] By the above technical solution, the color adjusting layer is arranged between the protective layer and the topcoat layer, different colors can be provided for the sprayed car film to meet the decorative requirements. According to actual needs, a solid paint layer or a metal paint layer or a pearlescent paint layer with better decoration can be selected. In the specific embodiment of the present application, the solid paint layer is taken as an example for illustration. In the solid paint layer, the above three kinds of solid paints have good weather resistance and gloss retention. In the specific embodiment of the present application, the polyaspartic ester type solid paint is taken as an example for illustration. The raw materials of the polyaspartic ester type solid paint and the color paste in the sprayed liquid car film composition are selected and prepared in the same way.

[0071] In a third aspect, the present application provides a preparation method of a sprayed car film, which adopts the following technical solution:

[0072] A preparation method of a sprayed car film, comprising the following steps:

[0073] S1. Disperse the raw materials for the A component of the sprayed liquid car film composition at a speed of 1000-1500 r / min for 30-40 minutes to obtain the A component; disperse the raw materials for the B component of the sprayed liquid car film composition at a speed of 1000-1500 r / min for 30-40 minutes to obtain the B component;

[0074] S2. Mix the A component and the B component in a weight ratio of (1-10):1, and then spray them on the outer surface of the car paint to form a protective layer after curing, thereby obtaining a sprayed car film.

[0075] In summary, the present application has the following beneficial technical effects: the imine resin, the isocyanate prepolymer, and the polyaspartic ester resin are used to prepare a coating layer with high strength, high elongation, and excellent weather resistance. The coating layer has good adhesion to the smooth car paint, and has extremely high tensile strength, weather resistance, and tear strength, can achieve whole piece peeling, and has good peelability and better replaceability. DETAILED DESCRIPTION

[0076] <Specific embodiments of aliphatic polyaspartic ester resin and alicyclic polyaspartic ester resin>

[0077] In some specific embodiments of the aliphatic polyaspartic ester resin, the aliphatic diamine is selected from at least one of pentanediamine, 2-methyl-1,5-pentanediamine, hexanediamine, and trimethylhexanediamine;

[0078] In some embodiments of the aliphatic polyaspartic ester resin, the maleic ester is selected from at least one of dimethyl maleate, diethyl maleate, di-n-butyl maleate, diisooctyl maleate;

[0079] In some embodiments of the aliphatic polyaspartic ester resin, the fumaric ester is selected from at least one of dimethyl fumarate, diethyl fumarate, dipropyl fumarate, dibutyl fumarate;

[0080] In some embodiments of the aliphatic polyaspartic ester resin, the ketone compound is selected from at least one of acetone, butanone, methyl isobutyl ketone, methyl isoamyl ketone, methyl isopropyl ketone;

[0081] In some embodiments of the aliphatic polyaspartic ester resin, the aldehyde compound is selected from at least one of benzaldehyde, phenylacetaldehyde, n-butyraldehyde, isobutyraldehyde, isoamyl aldehyde, 2,2-dimethyl-3-lauryloxy-propanal;

[0082] In some embodiments of the aliphatic polyaspartic ester resin, using the above raw materials, the aliphatic diamine is reacted with one of the maleic ester and the fumaric ester at a temperature of 70-100°C for 12-24 hours to produce the aliphatic polyaspartic ester resin.

[0083] In some embodiments of the aliphatic polyaspartic ester resin, using the above raw materials, the aliphatic diamine is first reacted with one of the maleic ester and the fumaric ester at a temperature of 70-100°C for 12-24 hours, and then reacted with at least one of the ketone compound and the aldehyde compound at a temperature of 90-120°C for 12-24 hours to produce the aliphatic imine-containing polyaspartic ester resin.

[0084] The cycloaliphatic polyaspartic ester resin differs from the aliphatic polyaspartic ester resin in that the aliphatic diamine is replaced by a cycloaliphatic diamine, and the rest is the same. The cycloaliphatic diamine is selected from at least one of 4,4'-diaminodicyclohexylmethane, 3,3'-dimethyl-4,4-diaminodicyclohexylmethane, isophorone diamine, methylcyclohexane diamine, cyclohexane diamine, 1,3-cyclohexanedimethylamine.

[0085] In the above numerous embodiments of the aliphatic polyaspartic ester resin and the cycloaliphatic polyaspartic ester resin, the applicant uses the following specific embodiments as examples. The raw materials used in the embodiments of the present application are all commercially available products unless otherwise specified.

[0086] Preparation Example 1.1.1

[0087] Aliphatic polyaspartic ester resin 1 was prepared by the following method:

[0088] Aliphatic polyaspartic ester resin 1 was prepared by the following method:

[0089] Preparation Example 1.1.2

[0090] Cycloaliphatic polyaspartic ester resin 1 was prepared by the following method:

[0091] Cycloaliphatic polyaspartic ester resin 1 was prepared by the following method:

[0092] Preparation Example 1.2.1

[0093] Aliphatic polyaspartic ester resin 2 was prepared by the following method:

[0094] Aliphatic polyaspartic ester resin 2 was prepared by the following method:

[0095] Preparation Example 1.2.2

[0096] Cycloaliphatic polyaspartic ester resin 2 was prepared by the following method:

[0097] Cycloaliphatic polyaspartic ester resin 2 was prepared by the following method:

[0098] Preparation Example 1.3.1

[0099] Aliphatic imine-containing polyaspartic ester resin was prepared by the following method:

[0100] Aliphatic imine-containing polyaspartic ester resin was prepared by the following method:

[0101] Preparation Example 1.3.2

[0102] Cycloaliphatic imine-containing polyaspartic ester resin was prepared by the following method:

[0103] The cycloaliphatic imine group-containing polyaspartic ester resin was prepared by addition reaction of 210 kg of 4,4'-diaminodicyclohexyl methane and 172 kg of diethyl maleate at a temperature of 90°C for 24 hours, followed by addition of 114 kg of benzaldehyde, dehydration condensation at a temperature of 120°C for 12 hours.

[0104] <Aliphatic isocyanate prepolymer, specific embodiment of cycloaliphatic isocyanate prepolymer>

[0105] In some specific embodiments of the aliphatic isocyanate prepolymer, the aliphatic isocyanate monomer is selected from at least one of hexamethylene diisocyanate, hexamethylene diisocyanate trimer, 1,5-pentane diisocyanate, 1,5-pentane diisocyanate trimer, and trimethyl hexane diisocyanate;

[0106] In some specific embodiments of the aliphatic isocyanate prepolymer, the polyol is a dihydric alcohol selected from at least one of a polyester diol, a polycaprolactone diol, a polycarbonate diol, a polytetrahydrofuran diol, and a chain aliphatic diol having 1-18 carbon atoms, and the dihydric alcohol has a molecular weight of 62-3000;

[0107] In some specific embodiments of the aliphatic isocyanate prepolymer, the first catalyst is an organic bismuth catalyst, the main component of which is bismuth iso-octoate, and the effective component content is 20%, which is purchased from Xinghai Chemical;

[0108] In some specific embodiments of the aliphatic isocyanate prepolymer, the first solvent is selected from at least one of toluene, xylene, acetone, butanone, ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol diacetate, propylene glycol methyl ether acetate, 3-methoxypropyl acetate, and 3-ethoxypropyl acetate;

[0109] In some specific embodiments of the aliphatic isocyanate prepolymer, the above raw materials are used, the aliphatic isocyanate monomer is polymerized with the polyol or the mixture of the polyaspartic ester resin and the polyol, or the polyaspartic ester resin and the polyol, under the condition of adding the first catalyst or the first solvent, at a temperature of 60-90°C for 5-9 hours, to prepare the aliphatic isocyanate prepolymer having an NCO content of 2-10%.

[0110] The specific embodiment of the cycloaliphatic isocyanate prepolymer is different from the specific embodiment of the aliphatic isocyanate prepolymer in that the aliphatic isocyanate monomer is replaced by a cycloaliphatic isocyanate monomer, and the rest is the same. The cycloaliphatic isocyanate monomer is selected from at least one of isophorone diisocyanate, isophorone diisocyanate trimer, dicyclohexyl methane diisocyanate, and cyclohexane dimethylene diisocyanate.

[0111] In the above specific embodiments of the aliphatic isocyanate prepolymer and the alicyclic isocyanate prepolymer, the following specific embodiments are used by the applicant as examples. The raw materials used in the specific embodiments of the present application are all commercially available products, except for special instructions.

[0112] Preparation Example 2.1.1

[0113] The aliphatic isocyanate prepolymer 1 is prepared by the following method:

[0114] After 100 kg of hexamethylene diisocyanate (NCO content of 49.5%) is warmed to 70°C, 302 kg of polycaprolactone diol (average molecular weight of 1000) is added, and then the reaction is maintained at 70°C for 8 hours to obtain an aliphatic isocyanate prepolymer 1 with an NCO content of 6.0%.

[0115] Preparation Example 2.1.2

[0116] The alicyclic isocyanate prepolymer 1 is prepared by the following method:

[0117] After 100 kg of isophorone diisocyanate (NCO content of 37.5%) is warmed to 70°C, 219 kg of polycaprolactone diol (average molecular weight of 1000) is added, and then the reaction is maintained at 70°C for 8 hours to obtain an alicyclic isocyanate prepolymer 1 with an NCO content of 6.0%.

[0118] Preparation Example 2.2.1

[0119] The aliphatic isocyanate prepolymer 2 is prepared by the following method:

[0120] After 100 kg of 1,5-pentane diisocyanate (NCO content of 54.5%) is added with 0.01 kg of an organic bismuth catalyst, it is warmed to 60°C, and then 290 kg of polytetrahydrofuran diol (average molecular weight of 2000) and 100 kg of polycarbonate diol (average molecular weight of 650) are added, and then the reaction is maintained at 60°C for 5 hours to obtain an aliphatic isocyanate prepolymer 2 with an NCO content of 6.0%.

[0121] Preparation Example 2.2.2

[0122] The alicyclic isocyanate prepolymer 2 is prepared by the following method:

[0123] After 100 kg of dicyclohexylmethane diisocyanate (NCO content of 32%) is added with 0.01 kg of an organic bismuth catalyst, it is warmed to 60°C, and then 290 kg of polytetrahydrofuran diol (average molecular weight of 2000) and 100 kg of polycarbonate diol (average molecular weight of 650) are added, and then the reaction is maintained at 60°C for 5 hours to obtain an alicyclic isocyanate prepolymer 2 with an NCO content of 6.0%.

[0124] Preparation Example 2.3.1

[0125] The aliphatic isocyanate prepolymer 3 was prepared by the following method:

[0126] To 138 kg of trimethylhexane diisocyanate (NCO content of 40%) was added 40 kg of xylene and 30 kg of butyl acetate, and after warming to 80°C, 290 kg of polycaprolactone diol (average molecular weight of 2000) was added, and then reacted for 5 hours at 80°C, and then 20 kg of glycerol (average molecular weight of 92) was further added and reacted for 1 hour at 80°C, to obtain an aliphatic isocyanate prepolymer 3 having an NCO content of 3.0%.

[0127] Preparation Example 2.3.2

[0128] The alicyclic isocyanate prepolymer 3 was prepared by the following method:

[0129] To 193 kg of dicyclohexylmethane diisocyanate (NCO content of 32%) was added 68.5 kg of xylene and 51.5 kg of butyl acetate, and after warming to 80°C, 290 kg of polycaprolactone diol (average molecular weight of 2000) was added, and then reacted for 5 hours at 80°C, and then 180 kg of the alicyclic polyaspartic ester resin 1 (average molecular weight of 582) prepared in Preparation Example 1.1.2 was further added and reacted for 1 hour at 80°C, to obtain an alicyclic isocyanate prepolymer 3 having an NCO content of 3.0%.

[0130] Preparation Example 2.4.1

[0131] The aliphatic isocyanate prepolymer 4 was prepared by the following method:

[0132] To 100 kg of 1,5-pentane diisocyanate (NCO content of 54.5%) was added 0.01 kg of an organic bismuth catalyst, and after warming to 75°C, 950 kg of polyester diol (average molecular weight of 3000) was added, and then reacted for 8 hours at 75°C, and then 500 kg of 1,5-pentane diisocyanate trimer (NCO content of 25%) was further added and reacted for 1 hour at 75°C, to obtain an aliphatic isocyanate prepolymer 4 having an NCO content of 9.86%.

[0133] Preparation Example 2.4.2

[0134] The alicyclic isocyanate prepolymer 4 was prepared by the following method:

[0135] To 130 kg of cyclohexane dimethylene diisocyanate (NCO content of 43%) add 0.01 kg of organic bismuth catalyst, heat to 75°C, then add 950 kg of polyester diol (average molecular weight of 3000), then keep at 75°C for 8 hours, then continue to add 330 kg of dicyclohexylmethane diisocyanate (NCO content of 32%) and 50 kg of isophorone diisocyanate trimer (NCO content of 17.5%) and keep for 1 hour, to obtain an alicyclic isocyanate prepolymer 4 with NCO content of 9.86%.

[0136] <Aliphatic imine resin, alicyclic imine resin, specific embodiments>

[0137] In some specific embodiments of the aliphatic imine resin, the aliphatic diamine is selected from at least one of pentanediamine, 2-methyl-1,5-pentanediamine, hexanediamine, trimethylhexanediamine;

[0138] In some specific embodiments of the aliphatic imine resin, the above raw materials are used, the aliphatic diamine is dehydrated and condensed with at least one of ketone compounds, aldehyde compounds at a temperature of 90-120°C for 12-24 hours to obtain the aliphatic imine resin.

[0139] The specific embodiments of the alicyclic imine resin are different from the specific embodiments of the aliphatic imine resin in that the aliphatic diamine is replaced by an alicyclic diamine, and the rest are the same. The alicyclic diamine is selected from at least one of 4,4'-diaminodicyclohexylmethane, 3,3'-dimethyl-4,4-diaminodicyclohexylmethane, isophorone diamine, methylcyclohexanediamine, cyclohexanediamine, 1,3-cyclohexanedimethylamine.

[0140] In the above numerous specific embodiments of the aliphatic imine resin and the alicyclic imine resin, the applicant uses the following specific embodiments as examples. The raw materials used in the specific embodiments of the present application are all commercially available products unless otherwise specified.

[0141] Preparation Example 3.1.1

[0142] The aliphatic imine resin 1 is prepared by the following method:

[0143] Mix 116 kg of hexanediamine and 144 kg of isobutyraldehyde, heat to 90°C, dehydrate and condense for 12 hours to obtain the aliphatic imine resin 1.

[0144] Preparation Example 3.1.2

[0145] The alicyclic imine resin 1 is prepared by the following method:

[0146] Mixing 170 kg isophorone diamine, 128 kg methylcyclohexane diamine and 577 kg methyl isobutyl ketone, dehydrating and condensing at 90 °C for 12 hours to obtain alicyclic imine resin 1.

[0147] Preparation Example 3.2.1

[0148] The preparation method of the alicyclic imine resin 2 is as follows:

[0149] Mixing 102 kg pentanediamine and 220 kg benzaldehyde, dehydrating and condensing at 120 °C for 12 hours to obtain the alicyclic imine resin 2.

[0150] Preparation Example 3.2.2

[0151] The preparation method of the alicyclic imine resin 2 is as follows:

[0152] Mixing 210 kg 4,4'-diaminodicyclohexyl methane, 53 kg isobutyraldehyde and 220 kg methyl isobutyl ketone, dehydrating and condensing at 120 °C for 12 hours to obtain the alicyclic imine resin 2.

[0153] Preparation Example 3.3.1

[0154] The preparation method of the alicyclic imine resin 3 is as follows:

[0155] Mixing 116 kg 2-methyl-1,5-pentanediamine, 108 kg butanone and 150 kg methyl isobutyl ketone, dehydrating and condensing at 90 °C for 24 hours to obtain the alicyclic imine resin 3.

[0156] Preparation Example 3.3.2

[0157] The preparation method of the alicyclic imine resin 3 is as follows:

[0158] Mixing 238 kg 3,3'-dimethyl-4,4-diaminodicyclohexyl methane, 108 kg butanone and 150 kg methyl isobutyl ketone, dehydrating and condensing at 110 °C for 24 hours to obtain the alicyclic imine resin 3.

[0159] <Specific embodiments of the color paste>

[0160] In some specific embodiments of the color paste, the anti-settling agent is BYK163;

[0161] In some specific embodiments of the color paste, the dispersing agent is fumed silica R972 or polyamide wax 6900-20X;

[0162] In some specific embodiments of the color paste, the pigment is selected from one of inorganic pigments, pearlescent pigments, organic pigments; wherein the inorganic pigments include but are not limited to diamond titanium white, carbon black, iron oxide red, iron yellow;

[0163] In some embodiments of the color paste, the third solvent is selected from at least one of toluene, xylene, acetone, butanone, ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol diacetate, propylene glycol methyl ether acetate, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate;

[0164] In some embodiments of the color paste, using the above raw materials, 0-60 parts of the aliphatic polyaspartic ester resin, 0-60 parts of the imine resin, 0.1-1 parts of the anti-settling agent, 1-10 parts of the dispersant, 10-70 parts of the pigment, and 0-20 parts of the third solvent are mixed and high-speed dispersed at a speed of 1000-1500 r / min for 30-40 minutes, and then ground to a fineness of less than 20 μm to obtain the color paste.

[0165] In the above numerous embodiments of the color paste, the applicant uses the following several embodiments as examples for illustration. The raw materials used in the embodiments of the present application are all commercially available products, except for special instructions.

[0166] Preparation Example 4.1

[0167] The color paste 1 is prepared by the following method:

[0168] The aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.2, the aliphatic imine resin 1 prepared in Preparation Example 3.1.2, 0.2 kg of the anti-settling agent (BYK 163), 1 kg of the dispersant (fumed silica R972), 8 kg of red iron oxide, 25 kg of pearlescent white, 10 kg of butyl acetate, and 5.8 kg of propylene glycol methyl ether acetate are high-speed dispersed at a speed of 1000 r / min for 40 minutes, and then ground to a fineness of less than 20 μm to obtain the color paste 1.

[0169] Preparation Example 4.2

[0170] The color paste 2 is prepared by the following method:

[0171] The aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.2, 0.1 kg of the anti-settling agent (BYK 163), 5 kg of the dispersant (polyamide wax 6900-20X), 8 kg of red iron oxide, 11.1 kg of pearlescent white, 10 kg of butyl acetate, and 5.8 kg of propylene glycol methyl ether acetate are high-speed dispersed at a speed of 1500 r / min for 30 minutes, and then ground to a fineness of less than 20 μm to obtain the color paste 2.

[0172] Preparation Example 4.3

[0173] The color paste 3 is prepared by the following method:

[0174] A colorant paste 3 was prepared by dispersing 25 kg of the cycloaliphatic imine resin 1 prepared in Preparation Example 3.1.2, 1 kg of an anti-settling agent (BYK 163), 1 kg of a dispersing agent (fumed silica R972), 30 kg of iron oxide red, 40 kg of pearl white, and 3 kg of ethylene glycol diacetate at a rotation speed of 1300 r / min for 35 minutes, and then grinding to a fineness of less than 20 μm.

[0175] <Embodiment of the sprayable car coating film>

[0176] The applicant used the raw materials prepared by the above preparation examples and other raw materials, and used the following examples and comparative examples as examples to illustrate in detail the influence of the raw material adjustment of the present application on the performance of the sprayable car coating film.

[0177] Example 1.1

[0178] A method for preparing a sprayable car coating film, comprising the following steps:

[0179] S1. A component A was prepared by dispersing 40 kg of the cycloaliphatic isocyanate prepolymer 1 prepared in Preparation Example 2.1.2, 25 kg of a second solvent (10 kg of butyl acetate and 15 kg of propylene glycol methyl ether acetate), 1 kg of an antifoaming agent (BYK 1790), 1 kg of a leveling agent (EFKA 3600), and 3 kg of an ultraviolet light absorbing agent (UV 1130) at a rotation speed of 1000 r / min for 40 minutes; and a component B was prepared by dispersing 20 kg of the aliphatic imine resin 1 prepared in Preparation Example 3.1.1, 20 kg of the aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.1, and 35 kg of a second solvent (20 kg of xylene and 15 kg of propylene glycol methyl ether acetate) at a rotation speed of 1000 r / min for 40 minutes;

[0180] S2. The component A and the component B in a weight ratio of 4.5:1 were mixed, and then sprayed on the outer surface of the car paint to form a protective layer with a thickness of 100 μm after curing, thereby obtaining a sprayable car coating film.

[0181] Example 1.2

[0182] A method for preparing a sprayable car coating film, comprising the following steps:

[0183] S1. Disperse 40 kg of the alicyclic isocyanate prepolymer 2 prepared in Preparation Example 2.2.2, 25 kg of the second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of the defoaming agent (BYK 1790), 1 kg of the leveling agent (EFKA 3600), and 3 kg of the ultraviolet absorber (UV 1130) at a rotation speed of 1500 r / min for 30 minutes to obtain a component A; disperse 20 kg of the aliphatic imine resin 2 prepared in Preparation Example 3.2.1, 20 kg of the aliphatic polyaspartic ester resin 2 prepared in Preparation Example 1.2.1, and 35 kg of the second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) at a rotation speed of 1500 r / min for 30 minutes to obtain a component B;

[0184] S2. Mix the component A and the component B in a weight ratio of 4:1, spray on the outer surface of the car paint, and form a protective layer having a thickness of 100 μm after curing to obtain a sprayed car coating film.

[0185] Example 1.3

[0186] A method for preparing a sprayed car coating film, comprising the following steps:

[0187] S1. Disperse 40 kg of the alicyclic isocyanate prepolymer 3 prepared in Preparation Example 2.3.2, 25 kg of the second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of the defoaming agent (BYK 1790), 1 kg of the leveling agent (EFKA 3600), and 3 kg of the ultraviolet absorber (UV 1130) at a rotation speed of 1000 r / min for 40 minutes to obtain a component A; disperse 20 kg of the aliphatic imine resin 2 prepared in Preparation Example 3.2.1, 20 kg of the aliphatic imine group-containing polyaspartic ester resin prepared in Preparation Example 1.3.1, and 35 kg of the second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) at a rotation speed of 1000 r / min for 40 minutes to obtain a component B;

[0188] S2. Mix the component A and the component B in a weight ratio of 10:1, spray on the outer surface of the car paint, and form a protective layer having a thickness of 100 μm after curing to obtain a sprayed car coating film.

[0189] Example 1.4

[0190] A method for preparing a sprayed car coating film, comprising the following steps:

[0191] S1. Use the alicyclic isocyanate prepolymer 4 prepared in Preparation Example 2.4.2 as a component A; use the aliphatic imine resin 3 prepared in Preparation Example 3.3.1 as a component B;

[0192] S2. The A component and the B component in a weight ratio of 3.5:1 are mixed and sprayed on the outer surface of the vehicle paint to form a protective layer with a thickness of 100 μm after curing, thereby obtaining a sprayed vehicle film.

[0193] Example 2.1

[0194] A preparation method of a sprayed vehicle film, comprising the following steps:

[0195] S1. 40 kg of the aliphatic isocyanate prepolymer 1 prepared in Preparation Example 2.1.1, 25 kg of a second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of a defoaming agent (BYK 1790), 1 kg of a leveling agent (EFKA 3600), and 3 kg of an ultraviolet light absorber (UV 1130) are dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain an A component; 20 kg of the alicyclic imine resin 1 prepared in Preparation Example 3.1.2, 20 kg of the aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.1, and 35 kg of a second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) are dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain a B component;

[0196] S2. The A component and the B component in a weight ratio of 3.5:1 are mixed and sprayed on the outer surface of the vehicle paint to form a protective layer with a thickness of 100 μm after curing, thereby obtaining a sprayed vehicle film.

[0197] Example 2.2

[0198] A preparation method of a sprayed vehicle film, comprising the following steps:

[0199] S1. 40 kg of the aliphatic isocyanate prepolymer 1 prepared in Preparation Example 2.1.1, 25 kg of a second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of a defoaming agent (BYK 1790), 1 kg of a leveling agent (EFKA 3600), and 3 kg of an ultraviolet light absorber (UV 1130) are dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain an A component; 20 kg of the alicyclic imine resin 1 prepared in Preparation Example 3.1.2, 20 kg of the aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.1, and 35 kg of a second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) are dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain a B component;

[0200] S2. The A component and the B component in a weight ratio of 3.5:1 are mixed and sprayed on the outer surface of the vehicle paint to form a protective layer with a thickness of 100 μm after curing, thereby obtaining a sprayed vehicle film.

[0201] Example 2.3

[0202] A preparation method of a sprayed car film, comprising the following steps:

[0203] S1. Disperse 40 kg of the aliphatic isocyanate prepolymer 3 prepared in Preparation Example 2.3.1, 25 kg of the second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of the defoaming agent (BYK 1790), 1 kg of the leveling agent (EFKA 3600), and 3 kg of the ultraviolet light absorber (UV 1130) at a rotation speed of 1000 r / min for 40 minutes to obtain a component A; disperse 20 kg of the alicyclic imine resin 2 prepared in Preparation Example 3.2.2, 20 kg of the aliphatic imine group-containing polyaspartate resin prepared in Preparation Example 1.3.1, and 35 kg of the second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) at a rotation speed of 1000 r / min for 40 minutes to obtain a component B;

[0204] S2. Mix the component A and the component B in a weight ratio of 7:1, spray on the outer surface of the car paint, and form a protective layer with a thickness of 100 μm after curing to obtain the sprayed car film.

[0205] Example 2.4

[0206] A preparation method of a sprayed car film, comprising the following steps:

[0207] S1. Disperse 10 kg of the aliphatic isocyanate prepolymer 4 prepared in Preparation Example 2.4.1, 5 kg of the second solvent (xylene), 0.1 kg of the defoaming agent (BYK 1790), 0.1 kg of the leveling agent (EFKA 3600), and 0.5 kg of the ultraviolet light absorber (UV 1130) at a rotation speed of 1000 r / min for 40 minutes to obtain a component A; disperse 5 kg of the alicyclic imine resin 3 prepared in Preparation Example 3.3.2, 13 kg of the second solvent (propylene glycol methyl ether acetate), 0.1 kg of the defoaming agent (BYK 1790), 0.1 kg of the leveling agent (EFKA 3600), and 0.5 kg of the ultraviolet light absorber (UV 1130) at a rotation speed of 1000 r / min for 40 minutes to obtain a component B;

[0208] S2. Mix the component A and the component B in a weight ratio of 1:1, spray on the outer surface of the car paint, and form a protective layer with a thickness of 100 μm after curing to obtain the sprayed car film.

[0209] Example 3.1

[0210] A preparation method of a sprayed car film, comprising the following steps:

[0211] S1. 40 kg of the aliphatic isocyanate prepolymer 1 prepared in Preparation Example 2.1.1, 25 kg of a second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of a defoaming agent (BYK 1790), 1 kg of a leveling agent (EFKA 3600), and 3 kg of a UV absorber (UV 1130) were dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain a component A; 20 kg of the aliphatic imine resin 1 prepared in Preparation Example 3.1.1, 20 kg of the alicyclic polyaspartic ester resin 1 prepared in Preparation Example 1.1.2, and 35 kg of a second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) were dispersed at a rotation speed of 1500 r / min for 40 minutes to obtain a component B;

[0212] S2. After mixing the component A and the component B in a weight ratio of 4.2:1, the mixture was sprayed on the outer surface of a car paint to form a protective layer having a thickness of 100 μm after curing, thereby obtaining a sprayed car coating film.

[0213] Example 3.2

[0214] A method for preparing a sprayed car coating film, comprising the steps of:

[0215] S1. 40 kg of the aliphatic isocyanate prepolymer 2 prepared in Preparation Example 2.2.1, 25 kg of a second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of a defoaming agent (BYK 1790), 1 kg of a leveling agent (EFKA 3600), and 3 kg of a UV absorber (UV 1130) were dispersed at a rotation speed of 1000 r / min for 40 minutes to obtain a component A; 20 kg of the aliphatic imine resin 2 prepared in Preparation Example 3.2.1, 20 kg of the alicyclic polyaspartic ester resin 2 prepared in Preparation Example 1.2.2, and 35 kg of a second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) were dispersed at a rotation speed of 1500 r / min for 40 minutes to obtain a component B of a polyurea coating material;

[0216] S2. After mixing the component A and the component B in a weight ratio of 4:1, the mixture was sprayed on the outer surface of a car paint to form a protective layer having a thickness of 100 μm after curing, thereby obtaining a sprayed car coating film.

[0217] Example 3.3

[0218] A method for preparing a sprayed car coating film, comprising the steps of:

[0219] S1. Disperse 40 kg of the aliphatic isocyanate prepolymer 3 prepared in Preparation Example 2.3.1, 25 kg of the second solvent (10 kg of butyl acetate, 15 kg of propylene glycol methyl ether acetate), 1 kg of the defoaming agent (BYK 1790), 1 kg of the leveling agent (EFKA 3600), and 3 kg of the ultraviolet light absorber (UV 1130) at a rotation speed of 1000 r / min for 40 min to obtain the A component; disperse 20 kg of the aliphatic imine resin 3 prepared in Preparation Example 3.3.1, 20 kg of the alicyclic imine group-containing polyaspartic ester resin prepared in Preparation Example 1.3.2, and 35 kg of the second solvent (20 kg of xylene, 15 kg of propylene glycol methyl ether acetate) at a rotation speed of 1500 r / min for 40 min to obtain the B component;

[0220] S2. Mix the A component and the B component in a weight ratio of 10:1, spray them on the outer surface of the car paint, and form a protective layer with a thickness of 100 μm after curing to obtain the sprayed car coating film.

[0221] Example 4

[0222] A preparation method of a sprayed car coating film, which is different from Example 1.1 in that the aliphatic imine resin 1 prepared in Preparation Example 3.1.1 is replaced by the alicyclic imine resin 2 prepared in Preparation Example 3.2.2, the weight ratio of the A component to the B component is 3.3:1, and the rest is the same.

[0223] Example 5.1

[0224] A preparation method of a sprayed car coating film, which is different from Example 4 in that the aliphatic polyaspartic ester resin 1 prepared in Preparation Example 1.1.1 is replaced by the alicyclic polyaspartic ester resin 1 prepared in Preparation Example 1.1.2, the weight ratio of the A component to the B component is 3:1, and the rest is the same.

[0225] Example 5.2

[0226] A preparation method of a sprayed car coating film, which is different from Example 5.1 in that 3 kg of the second catalyst (phosphoric acid) is further added in step S2, and the rest is the same.

[0227] Example 6.1

[0228] A preparation method of a sprayed car coating film, which is different from Example 2.1 in that 1 kg of 1,5-pentane diisocyanate trimer is further added to the A component in step S1, the weight ratio of the A component to the B component is 3.5:1, and the rest is the same.

[0229] Example 6.2

[0230] A method for preparing a sprayable car coating film, which is different from example 2.1 in that 10 kg of dicyclohexylmethane diisocyanate is further added to the A component in step S1, and the weight ratio of the A component to the B component is 1.5:1, and the rest is the same.

[0231] Examples 7.1-7.4

[0232] A method for preparing a sprayable car coating film, which is different from example 2.1 in that 20 kg of color paste is further added to the B component in step S1, wherein example 7.1 uses ordinary color paste, which is purchased from Axalta, and the model is Spies Hecker; examples 7.2-7.4 respectively use the color paste prepared by preparation examples 4.1-4.3.

[0233] Example 8.1

[0234] A method for preparing a sprayable car coating film, which is different from example 5.1 in that a polyaspartic polyurea coating is further sprayed on the outer surface of the protective layer, and a topcoat layer with a thickness of 40 μm is formed after curing. The polyaspartic polyurea coating is a self-made product, and the specific raw materials are as follows: the A component uses 40 kg of the alicyclic polyaspartic resin prepared by preparation example 1.1.2, 40 kg of the second solvent (20 kg of butyl acetate, 20 kg of propylene glycol methyl ether acetate), 0.1 kg of defoaming agent (BYK1790), 0.1 kg of leveling agent (EFKA3600) and 0.3 kg of ultraviolet absorber (UV1130); the B component uses 20 kg of HDI trimer and 20 kg of the second solvent (10 kg of xylene, 10 kg of propylene glycol methyl ether acetate).

[0235] Example 8.2

[0236] A method for preparing a sprayable car coating film, which is different from example 5.1 in that a polyaspartic polyurea coating is further sprayed on the outer surface of the protective layer, and a topcoat layer with a thickness of 100 μm is formed after curing. The polyaspartic polyurea coating is a self-made product, and the specific raw materials are as follows: the A component uses 40 kg of the alicyclic polyaspartic resin prepared by preparation example 1.1.2, 40 kg of the second solvent (20 kg of butyl acetate, 20 kg of propylene glycol methyl ether acetate), 0.1 kg of defoaming agent (BYK1790), 0.1 kg of leveling agent (EFKA3600) and 0.3 kg of ultraviolet absorber (UV1130); the B component uses 20 kg of HDI trimer and 20 kg of the second solvent (10 kg of xylene, 10 kg of propylene glycol methyl ether acetate).

[0237] Example 9

[0238] A preparation method of a sprayed car coating film, which is different from example 8.1 in that a polyaspartic ester type solid color coating is first sprayed on the outer surface of the protective layer, and then a polyaspartic ester polyurea coating is sprayed, the polyaspartic ester type solid color coating uses the color paste prepared in preparation example 4.1, and after curing, a color adjusting layer with a thickness of 20 μm is formed.

[0239] Comparative example 1

[0240] Different from example 1.1 in that the alicyclic isocyanate prepolymer 1 prepared in preparation example 2.1.2 in the A component is replaced by the aliphatic isocyanate prepolymer 1 prepared in preparation example 2.1.1, the aliphatic imine resin and the aliphatic polyaspartic ester resin in the B component are replaced by diphenylmethane diamine (MDA), and the rest is prepared by the same method as example 1.1 to obtain an aromatic sprayed polyurea, which is sprayed on the outer surface of the car paint, and after curing, a protective layer with a thickness of 100 μm is formed.

[0241] Comparative example 2

[0242] Different from example 1.1 in that the alicyclic isocyanate prepolymer 1 prepared in preparation example 2.1.2 in the A component is replaced by the aliphatic isocyanate prepolymer 1 prepared in preparation example 2.1.1, and the aliphatic imine resin in the B component is removed, and the rest is prepared by the same method as example 1.1 to obtain a hindered secondary amine aspartic ester polyurea, which is sprayed on the outer surface of the car paint, and after curing, a protective layer with a thickness of 100 μm is formed.

[0243] Comparative example 3

[0244] Different from example 1.1 in that the alicyclic isocyanate prepolymer 1 prepared in preparation example 2.1.2 in step S1 is replaced by the aliphatic isocyanate prepolymer 1 prepared in preparation example 2.1.1, and the rest is the same.

[0245] Performance detection

[0246] The sprayed car coating films prepared in the above examples 1-9 and comparative examples 1-3 are respectively detected for the surface dry time, the press dry time, the tensile strength, the elongation, the tear strength, the aging resistance, the gloss loss and the pull adhesion, and the hardness of examples 5.1 and examples 8.1-8.2 is detected, and the detection results are shown in table 1.

[0247] Among them, the surface dry time and the press dry time are detected according to GB / T 1728-1989;

[0248] Tensile strength, elongation and tear strength refer to GB / T 16777-2008, the coating in the above examples and comparative examples is coated on a glass plate, after curing for 168 h under standard conditions, a coating layer with a thickness of (0.2-1.0) mm is formed, then a slice machine is used to cut the coating layer to obtain dumbbell I type samples in accordance with GB / T 528, then a tensile testing machine is used to stretch the samples to break at a stretching speed of 500 mm / min, and the tensile strength, elongation and tear strength are calculated;

[0249] Aging resistance refers to GB / T 1766-2008, the sample is irradiated by an ultraviolet lamp in a UVA aging box, and the color change rate ΔE of the sample after 1000 h is calculated; light loss rate refers to GB / T 1766-2008 to determine the gloss before and after aging to calculate the light loss rate;

[0250] Pull-off adhesion is detected according to GB / T 5210-2006; hardness is detected according to GB / T 2739-2006.

[0251] Table 1 performance test results

[0252]

[0253]

[0254] Table 1 (continued)

[0255]

[0256]

[0257] Data analysis:

[0258] As can be seen from Table 1, the sprayable car film prepared in Examples 1-3 has good strength, elongation, weather resistance, tear strength, can realize whole piece peeling, has good tearability, and also has good adhesion with car paint. The car film prepared in Comparative Example 1 by reaction of an aromatic amino component and an isocyanate has too fast drying speed, low pull-off adhesion, is easy to fall off, and has poor weather resistance, easy yellowing and light loss. The car film prepared in Comparative Example 2 by reaction of a hindered secondary amine aspartate resin and an isocyanate has good adhesion, but has poor mechanical properties such as tensile strength and tear strength, and is difficult to realize whole piece peeling.

[0259] The tensile strength and tear strength of Example 4 are obviously higher than those of Example 1.1, and the weather resistance is stronger than that of Example 1.1, the tensile strength and tear strength of Example 5 are higher than those of Example 4, and the weather resistance is stronger than that of Example 4, which shows that by optimizing the minimum introduction amount of the alicyclic structure, the mechanical strength of the coating layer is enhanced, thereby improving the peelability of the coating layer.

[0260] The tensile strength and tear strength of examples 6.1-6.2 are obviously higher than that of example 2.1, and the weather resistance is stronger than that of example 2.1, which shows that the isocyanate monomer with rigid alicyclic structure, isocyanate prepolymer and the components in the B component such as imine resin in examples 6.1-6.2 are cured, which further improves the mechanical strength of the coating and the peelability of the coating.

[0261] In examples 7.1-7.4, the tensile strength and tear strength of examples 7.2-7.4 are higher than that of example 7.1, and the weather resistance is stronger than that of example 7.1, which shows that the color paste prepared by mixing polyaspartic acid ester resin or imine resin with pigment and other components in examples 7.2-7.4 has excellent weather resistance and good compatibility with other components in the coating, and is easy to disperse uniformly in the coating.

[0262] The hardness of examples 8.1-8.2 is obviously greater than that of example 5.1, which shows that the surface of the protective layer is further provided with a topcoat layer, which can improve the hardness of the car film and enhance the scratch resistance of the car film.

[0263] The examples of the specific embodiments are the preferred embodiments of the present application, but do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sprayable liquid car finish film composition comprising a component A and a component B, characterized in that, By weight, component A comprises 10-40 parts of isocyanate prepolymer and 1-10 parts of alicyclic isocyanate monomer; component B comprises 5-20 parts of imide resin and 0-20 parts of polyaspartic ester resin, wherein the amount of polyaspartic ester resin is not zero; the isocyanate prepolymer is selected from aliphatic isocyanate prepolymer and / or alicyclic isocyanate elastic prepolymer; the imide resin is selected from aliphatic imide resin and / or alicyclic imide resin; the polyaspartic ester resin is selected from aliphatic polyaspartic ester resin and / or alicyclic polyaspartic ester resin; and when components A and B are used in combination, at least two of the isocyanate prepolymer, imide resin, and polyaspartic ester resin contain alicyclic structures. By weight, the sprayed liquid car wrap composition further includes 0-1 parts of defoamer, 0-1 parts of anti-sagging agent, 0-3 parts of ultraviolet absorber, 0-3 parts of second catalyst, 0-60 parts of second solvent and 20 parts of color paste; The color paste is prepared by combining at least one of polyaspartic acid ester resin and imine resin with an anti-settling agent, a dispersant, a pigment, and a third solvent.

2. A liquid sprayable automotive finish composition according to claim 1 wherein, When components A and B are used in combination, the isocyanate prepolymer, imine resin, and polyaspartic acid ester resin all contain alicyclic structures.

3. A spray-on car cover film comprising a protective layer, characterized in that The protective layer is formed by curing the sprayed liquid car wrap film composition of claim 1 or 2 onto the outer surface of the car paint.

4. A spray-on vehicle cover film according to claim 3, wherein The outer surface of the protective layer is also provided with a topcoat layer, which is an acrylic resin layer or a polyaspartic acid ester polyurea layer.

5. A spray-on vehicle cover film according to claim 4, wherein A color-matching layer is also provided between the protective layer and the topcoat layer, and the color-matching layer is selected from at least one of solid color paint layer, metallic paint layer, and pearlescent paint layer.

6. A method for preparing the spray-applied car wrap film according to claim 3, characterized in that, Includes the following steps: S1. Disperse the raw materials used for component A of the sprayed liquid car wrap film composition at a rotation speed of 1000-1500 r / min for 30-40 minutes to obtain component A; disperse the raw materials used for component B of the sprayed liquid car wrap film composition at a rotation speed of 1000-1500 r / min for 30-40 minutes to obtain component B. S2. Mix component A and component B in a weight ratio of (1-10):1, spray the mixture onto the outer surface of the car paint, and after curing, form a protective layer to obtain a sprayed car wrap film.

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