UV polyurethane acrylate self-repairing coating as well as preparation method and application thereof

Abstract

The invention relates to a UV polyurethane acrylate self-repairing coating as well as a preparation method and application thereof. The self-repairing coating comprises the following components in parts by weight: 30-50 parts of polyisocyanate, 10-30 parts of polymer polyol, 0-5 parts of a micromolecule chain extender, 5-40 parts of an acrylate end-capping reagent, a polymerization inhibitor and a catalyst which account for 50-200ppm of the total raw materials, and a diluting monomer which accounts for 10-30 parts of the total raw materials. The UV polyurethane acrylate self-repairing coating provided by the invention has excellent thermal self-repairing performance, excellent smooth hand feeling, excellent stain resistance, excellent high glossiness, relatively high elongation and excellent carburetor resistance, and compared with a traditional UV polyurethane acrylate self-repairing coating, the UV polyurethane acrylate self-repairing coating provided by the invention has the advantages that the UV polyurethane acrylate self-repairing coating has excellent thermal self-repairing performance, excellent smooth hand feeling, excellent stain resistance, excellent high glossiness, relatively high elongation and excellent carburetor resistance; by using polyisocyanate as a matrix and various polycaprolactone modified acrylic ester as an end-capping reagent, the soft-segment and hard-segment structures of the material can be well balanced, so that the material has good carburetor resistance while having good elongation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of UV polyurethane acrylate self-repairing coating, preparation method and its application, specifically to a kind of UV polyurethane acrylate self-repairing coating with excellent thermal self-repairing performance, excellent smooth feeling, excellent stain resistance, excellent high gloss and higher elongation, while with excellent carburetor resistance, preparation method and its application. BACKGROUND

[0002] With the development of science and technology and the continuous improvement of people's performance requirements for products, the research and development of functional coatings have been increasingly concerned. UV light-cured coating has been widely used in many fields due to its fast curing speed, low energy consumption, environmental protection and excellent coating performance.

[0003] Polyurethane resin has excellent tensile strength, hardness, tear resistance and flexibility due to its unique soft and hard segment microphase separation structure, and also has good weather resistance, chemical corrosion resistance, high temperature resistance and wear resistance. UV-cured polyurethane coating prepared by compounding polyurethane as resin matrix with acrylate active monomer and combining with light curing technology shows broad application prospects.

[0004] However, the existing UV-cured polyurethane acrylate coating still has some problems in actual use. For example, when the elongation of the coating is high, the material's carburetor resistance will be foggy, or when the coating has good carburetor resistance, the material's elongation will be low. Therefore, it is of great practical significance to develop a UV polyurethane acrylate self-repairing coating with simple preparation process, high elongation and good carburetor resistance. SUMMARY

[0005] To solve the above problems, the main purpose of the present application is to provide a kind of UV polyurethane acrylate self-repairing coating with excellent thermal self-repairing performance, excellent smooth feeling, excellent stain resistance, excellent high gloss and higher elongation, while with excellent carburetor resistance, preparation method and its application.

[0006] The present application solves the above technical problems by the following technical scheme: a kind of UV polyurethane acrylate self-repairing coating, the UV polyurethane acrylate self-repairing coating includes the following components by weight content:

[0007]

[0008] The polymerization inhibitor and catalyst account for 50-200 ppm of the total raw materials, and the diluent monomer accounts for 10-30 parts of the total raw materials.

[0009] In specific embodiments of the present application, the polyisocyanate is selected from the group consisting of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, isophorone diisocyanate trimer, adduct of hexamethylene diisocyanate and trimethylolpropane, cyclohexane dimethylene diisocyanate trimer, adduct of isophorone diisocyanate and trimethylolpropane, adduct of cyclohexane dimethylene diisocyanate and trimethylolpropane, and combinations thereof.

[0010] In specific embodiments of the present application, the polymeric polyol is selected from the group consisting of polycaprolactone diol, polycarbonate diol, polytetrahydrofuran diol, polyethylene glycol, polypropylene glycol, polybutylene adipate diol, ethylene oxide-propylene oxide copolymer, and combinations thereof, having a molecular weight of 500 to 3000.

[0011] In specific embodiments of the present application, the small molecule chain extender is selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, diethyl pentanediol, 1,4-bishydroxymethyl cyclohexane, dodecanediol, trimethylolpropane, glycerol, pentaerythritol, and combinations thereof.

[0012] In specific embodiments of the present application, the acrylate end-capper is selected from the group consisting of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, polycaprolactone-modified hydroxyethyl acrylate, polycaprolactone-modified hydroxyethyl methacrylate, trimethylolpropane diacrylate, pentaerythritol triacrylate, polycaprolactone-modified pentaerythritol triacrylate, and combinations thereof.

[0013] In specific embodiments of the present application, the polymerization inhibitor is selected from the group consisting of hydroquinone, p-hydroxyanisole, and combinations thereof.

[0014] In specific embodiments of the present application, the catalyst is selected from the group consisting of triethylenediamine, bis(dimethylaminoethyl) ether, cyclohexylmethyl tertiary amine, dibutyl tin dilaurate, stannous octoate, potassium acetate, lead isooctoate, zinc isooctoate, tetrabutyl titanate, and combinations thereof.

[0015] In specific embodiments of the present application, the diluent monomer is selected from the group consisting of butyl acrylate, isooctyl acrylate, methyl acrylate, methyl methacrylate, hydroxyethyl acrylate, acrylic acid, tetrahydrofurfuryl acrylate, cyclotrimethylolpropane formal acrylate, 3,3,5-trimethylcyclohexyl acrylate, lauryl acrylate, isobornyl acrylate, isobornyl methacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, tricyclodecane dimethylol diacrylate, dipropylene glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, and combinations thereof.

[0016] The application further provides a preparation method of the UV polyurethane acrylate self-repairing coating.

[0017] (1) first, the polyisocyanate is added into the reaction kettle, then the reaction kettle is heated to 65-70 degrees and the stirring is started;

[0018] (2) first, the polymer polyol which is dried by melting is added into the reaction kettle and heated to 80-85℃ for 1-2h, the content of isocyanate group is determined, when the content of isocyanate group reaches the predetermined value, the next step is carried out;

[0019] (3) first, the small molecule chain extender which is dried by melting is added into the reaction kettle and the reaction is continued for 1-2h, the content of isocyanate group is determined, when the content of isocyanate group reaches the predetermined value, the next step is carried out;

[0020] (4) first, the acrylate capping agent, the dilute monomer with the polymerization inhibitor and the catalyst are added into the reaction kettle and the reaction is continued for 3-5h, the content of isocyanate group is determined, when the content of isocyanate group reaches zero, the reaction is ended, and the UV polyurethane acrylate self-repairing coating is obtained.

[0021] The application further provides an application of the UV polyurethane acrylate self-repairing coating, and the application includes the application in the car film, the mobile phone screen protection film, the decorative material bonding and the glass curtain wall repair.

[0022] The application has the following advantages:

[0023] The UV polyurethane acrylate self-repairing coating has excellent thermal self-repairing performance, excellent smoothness, excellent stain resistance, excellent high gloss and high elongation, and excellent carburetor resistance. DETAILED DESCRIPTION

[0024] The preferred embodiments of the application are described below to illustrate the technical solutions of the application.

[0025] The UV polyurethane acrylate self-repairing coating of the application comprises the following components with the following weight contents:

[0026] Polyisocyanate 30-50 parts

[0027] Polymer polyol 10-30 parts

[0028] Small molecule chain extender 0-5 parts

[0029] Acrylate end-capper 5-40 parts

[0030] The polymerization inhibitor and catalyst are 50-200 ppm of the total raw materials, and the diluent monomer is 10-30 parts of the total raw materials.

[0031] In the UV polyurethane acrylate self-repairing coating of the present application, the role of the polyisocyanate is to serve as the matrix of the coating and to crosslink with the polymer polyol and the small molecule chain extender to increase the hardness. The polyisocyanate that can be used in the present application includes, but is not limited to, one or a combination of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, isophorone diisocyanate trimer, the adduct of hexamethylene diisocyanate and trimethylolpropane, cyclohexane dimethylene diisocyanate trimer, the adduct of isophorone diisocyanate and trimethylolpropane, and the adduct of cyclohexane dimethylene diisocyanate and trimethylolpropane.

[0032] In the UV polyurethane acrylate self-repairing coating of the present application, the role of the polymer polyol is to provide a higher elongation and to crosslink with the polyisocyanate to increase the hardness. The polymer polyol that can be used in the present application includes, but is not limited to, polycaprolactone diol, polycarbonate diol, polytetrahydrofuran diol, polyethylene glycol, polypropylene glycol, polybutylene adipate glycol, and an oxirane-oxetane copolymer, with a molecular weight of 500-3000.

[0033] In the UV polyurethane acrylate self-repairing coating of the present application, the role of the small molecule chain extender is to react with the polyisocyanate to increase the crosslinking degree / hardness. The small molecule chain extender that can be used in the present application includes, but is not limited to, ethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,6-hexanediol, diethyl pentanediol, 1,4-dihydroxymethyl cyclohexane, dodecanediol, trimethylolpropane, glycerol, and pentaerythritol.

[0034] In the UV polyurethane acrylate self-repairing coating of the present application, the role of the acrylate end-capper is to provide an end-capping effect and a position for UV curing. The acrylate end-capper that can be used in the present application includes, but is not limited to, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, polycaprolactone-modified hydroxyethyl acrylate, polycaprolactone-modified hydroxyethyl methacrylate, trimethylolpropane diacrylate, pentaerythritol triacrylate, and polycaprolactone-modified pentaerythritol triacrylate.

[0035] In the UV polyurethane acrylate self-repairing coating of the present invention, the role of the polymerization inhibitor is to prevent the self-polymerization reaction of carbon-carbon double bonds in the coating. The polymerization inhibitor that can be used in the present invention includes but is not limited to hydroquinone and p-hydroxyanisole.

[0036] In the UV polyurethane acrylate self-healing coating of the present invention, the catalyst functions to accelerate the reaction between hydroxyl groups and isocyanate groups. Catalysts that can be used in the present invention include, but are not limited to, triethylenediamine, bis(dimethylaminoethyl) ether, cyclohexylmethyl tertiary amine, dibutyltin dilaurate, stannous octoate, potassium acetate, lead isooctanoate, zinc isooctanoate, and tetrabutyl titanate.

[0037] In the UV polyurethane acrylate self-repairing coating of the present invention, the diluent monomer functions to reduce the viscosity of the coating and participate in the subsequent UV curing reaction. Diluent monomers that can be used in the present invention include, but are not limited to, butyl acrylate, isooctyl acrylate, methyl acrylate, methyl methacrylate, hydroxyethyl acrylate, acrylic acid, tetrahydroglycosyl acrylate, cyclotrimethylolpropane formal acrylate, 3,3,5-trimethylcyclohexyl acrylate, lauric acid acrylate, isobornyl acrylate, isobornyl methacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, tricyclodecyl dimethanol diacrylate, dipropylene glycol diacrylate, polyethylene glycol diacrylate, and polypropylene glycol diacrylate.

[0038] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention and are not intended to limit the scope of the invention. The experimental methods in the following examples, for which no specific conditions are specified, are generally based on conventional conditions or the conditions recommended by the manufacturer. Unless otherwise stated, percentages and parts are percentages by weight and parts by weight. The "parts" mentioned in the following examples refer to "parts by weight."

[0039] Example 1

[0040] The components of the UV polyurethane acrylate self-repairing coating of this embodiment are shown in Table 1. The specific preparation process is as follows:

[0041] Step (1) First, 40g of hexamethylene diisocyanate trimer was added to a reactor, and then the reactor was heated to 65 degrees and stirred;

[0042] Step (2) firstly adds 20g of melt-dried polycarbonate diol 1000 into a reaction kettle and heats the reaction to 80°C for 1.5h, and measures the isocyanate group content. When the isocyanate group content reaches a predetermined value, the next step of reaction is carried out;

[0043] Step (3) 3 g of 1,6-hexanediol is first added to the reaction kettle and the reaction is continued for 2 h, and the isocyanate group content is determined. When the isocyanate group content reaches the predetermined value, the next step is carried out;

[0044] Step (4) 30.4 g of pentaerythritol triacrylate, 10 g of 1,6-hexanediol diacrylate in which 0.01 g of p-hydroxyanisole is dissolved, and 0.01 g of dibutyltin dilaurate are first added to the reaction kettle and the reaction is continued for 4 h, and the isocyanate group content is determined. When the isocyanate group content reaches zero, the reaction is stopped, and a UV polyurethane acrylate self-repairing coating is obtained.

[0045] Example 2

[0046] The components of the UV polyurethane acrylate self-repairing coating of this example are shown in Table 1, and the specific preparation process is as follows:

[0047] Step (1) 35 g of hexamethylene diisocyanate trimer is first added to the reaction kettle, and then the reaction kettle is heated to 70 degrees and stirring is started;

[0048] Step (2) 20 g of poly-caprolactone diol 1000 is first added to the reaction kettle and heated to 80°C and reacted for 1 h, and the isocyanate group content is determined. When the isocyanate group content reaches the predetermined value, the next step is carried out;

[0049] Step (3) 3 g of 1,6-hexanediol is first added to the reaction kettle and the reaction is continued for 2 h, and the isocyanate group content is determined. When the isocyanate group content reaches the predetermined value, the next step is carried out;

[0050] Step (4) 30.4 g of pentaerythritol triacrylate, 10 g of 1,6-hexanediol diacrylate in which 0.01 g of p-hydroxyanisole is dissolved, and 0.01 g of dibutyltin dilaurate are first added to the reaction kettle and the reaction is continued for 4 h, and the isocyanate group content is determined. When the isocyanate group content reaches zero, the reaction is stopped, and a UV polyurethane acrylate self-repairing coating is obtained.

[0051] Example 3

[0052] The components of the UV polyurethane acrylate self-repairing coating of this example are shown in Table 1, and the specific preparation process is as follows:

[0053] Step (1) 35 g of hexamethylene diisocyanate trimer is first added to the reaction kettle, and then the reaction kettle is heated to 70 degrees and stirring is started;

[0054] Step (2) 20 g of polytetramethylene glycol 1000 dried by melting was first added to the reaction kettle and heated to 80°C for 1.5 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached the predetermined value, the next step was carried out;

[0055] Step (3) 2 g of 1,4-butanediol dried by melting was first added to the reaction kettle and the reaction was continued for 1.5 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached the predetermined value, the next step was carried out;

[0056] Step (4) 12.01 g of poly (caprolactone) modified hydroxyethyl acrylate and 9.3 g of poly (caprolactone) modified pentaerythritol triacrylate, 20 g of isobornyl acrylate dissolved with 0.01 g of hydroquinone and 0.01 g of stannous octoate were first added to the reaction kettle and the reaction was continued for 4 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached zero, the reaction was stopped, and a UV polyurethane acrylate self-repairing coating was obtained.

[0057] Example 4

[0058] The components of the UV polyurethane acrylate self-repairing coating of this example are shown in Table 1, and the specific preparation process is as follows:

[0059] Step (1) 50 g of cyclohexane dimethylene diisocyanate and trimethylolpropane adduct were first added to the reaction kettle, and then the reaction kettle was heated to 70°C and stirring was started;

[0060] Step (2) 20 g of polytetramethylene glycol 1000 dried by melting was first added to the reaction kettle and heated to 80°C for 1.5 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached the predetermined value, the next step was carried out;

[0061] Step (3) 2 g of 1,4-butanediol dried by melting was first added to the reaction kettle and the reaction was continued for 1.5 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached the predetermined value, the next step was carried out;

[0062] Step (4) 12.01 g of poly (caprolactone) modified hydroxyethyl acrylate and 9.3 g of poly (caprolactone) modified pentaerythritol triacrylate, 20 g of isobornyl acrylate dissolved with 0.01 g of hydroquinone and 0.01 g of stannous octoate were first added to the reaction kettle and the reaction was continued for 4 h, and the content of isocyanate groups was determined. When the content of isocyanate groups reached zero, the reaction was stopped, and a UV polyurethane acrylate self-repairing coating was obtained.

[0063] Example 5

[0064] The components of the UV polyurethane acrylate self-repairing coating of this example are shown in Table 1, and the specific preparation process is as follows:

[0065] Step (1) first add 50 g cyclohexane dimethylene diisocyanate and trimethylol propane adduct into the reaction kettle, then heat the reaction kettle to 70 degrees and start stirring;

[0066] Step (2) first add 25 g molten and dried polycarbonate diol 1000 into the reaction kettle and heat to 83℃ for 1 h, then determine the isocyanate group content, when the isocyanate group content reaches the predetermined value, proceed to the next step;

[0067] Step (3) first add 2 g molten and dried 1,4-butanediol into the reaction kettle and continue to react for 2 h, then determine the isocyanate group content, when the isocyanate group content reaches the predetermined value, proceed to the next step;

[0068] Step (4) first add 7.31 g molten and dried polycaprolactone modified hydroxyethyl acrylate and 11.32 g polycaprolactone modified pentaerythritol triacrylate, 20 g isobornyl acrylate dissolved with 0.01 g p-hydroxyanisole and 0.01 g dibutyltin dilaurate into the reaction kettle and continue to react for 5 h, then determine the isocyanate group content, when the isocyanate group content reaches zero, the reaction ends, and UV polyurethane acrylate self-repairing coating is obtained.

[0069] Table 1. Material components and their addition amounts (weight parts) of Examples 1-5

[0070]

[0071]

[0072] Performance detection

[0073] The adhesion (tested according to GB / T 9286-1998 Test Method for Crosshatch Test of Paint and Varnish Film), gloss (tested according to GB / T 13891-2008 Determination of Gloss at 20° Angle of Specular Reflection of Building Finishing Materials), Mark pen performance (tested according to the test method of drawing several lines on the coating with a Mark pen, waiting for 2 min, and then wiping with alcohol to see if there are traces), elongation at break (tested according to GB / T 528-2009 Test Method for Tensile Stress-Strain Properties of Vulcanized or Thermoplastic Rubber), carburetor resistance (tested according to the test method of spraying the coating surface with a carburetor, waiting for 2 min, and then wiping with alcohol to see if there is fogging), and self-repairing performance (tested according to the test method of drawing back and forth 10 times with a copper brush with a load of 500 g, and then using hot water or a hot air gun to see if there are traces) of the UV polyurethane acrylate self-repairing coating prepared in the above examples were tested, and the changes in the adhesion, gloss, Mark pen performance, elongation at break, carburetor resistance, and self-repairing performance tested under different process conditions were analyzed. The detailed data are shown in Table 2.

[0074] Table 2 is the performance data of the UV polyurethane acrylate self-repairing coating of Examples 1-5

[0075]

[0076]

[0077] The comparison of the UV polyurethane acrylate self-repairing coating test data of Example 1 and Example 2 in Table 2 shows that, in the case of other ingredients being consistent, the elongation at break is reduced by 80% when pentaerythritol triacrylate is used to replace hydroxyethyl acrylate end-capping agent, the Mark pen performance is better, the carburetor resistance performance is also better, and other performances are similar. The comparison of the UV polyurethane acrylate self-repairing coating test data of Example 1 and Example 3 shows that, in the case of other ingredients being consistent, the elongation at break is increased by 15% when poly-caprolactone modified hydroxyethyl acrylate is used to replace hydroxyethyl acrylate end-capping agent, and other performances are similar. The comparison of the UV polyurethane acrylate self-repairing coating test data of Example 1 and Example 4 shows that, in the case of other ingredients being consistent, the elongation at break is reduced by 20% when poly-caprolactone modified pentaerythritol triacrylate and poly-caprolactone modified hydroxyethyl acrylate are used to replace hydroxyethyl acrylate end-capping agent, the Mark pen performance is better, the carburetor resistance performance is also better, and other performances are similar. The comparison of the UV polyurethane acrylate self-repairing coating test data of Example 4 and Example 5 shows that, in the case of other ingredients being consistent, the elongation at break is reduced by 12.5% when more poly-caprolactone modified pentaerythritol triacrylate and less poly-caprolactone modified hydroxyethyl acrylate are used to replace hydroxyethyl acrylate end-capping agent, and other performances are similar. This may be because the crosslinking degree of the coating is sharply increased when pentaerythritol triacrylate is used to replace hydroxyethyl acrylate, so that the elongation at break of the coating is sharply reduced, and the Mark pen and carburetor resistance performances are better; the molecular chain of the coating is longer and more flexible when poly-caprolactone modified pentaerythritol triacrylate or hydroxyethyl acrylate is used to replace pentaerythritol triacrylate or hydroxyethyl acrylate, so that the elongation at break of the coating is increased; the coating has both long-chain molecular structure and high crosslinking degree when poly-caprolactone modified pentaerythritol triacrylate and poly-caprolactone modified hydroxyethyl acrylate are used to replace single pentaerythritol triacrylate or hydroxyethyl acrylate, so that the coating has both high elongation at break and good Mark pen and carburetor resistance performances.

[0078] The present application provides a UV polyurethane acrylate self-repairing coating, which has excellent thermal self-repairing performance, excellent smooth touch, excellent stain resistance, excellent high gloss and high elongation, and excellent carburetor resistance performance. Compared with the traditional UV polyurethane acrylate self-repairing coating, the use of polyisocyanate as the base and a plurality of poly-caprolactone modified acrylates as the end-capping agent can well balance the soft segment and hard segment structure of the material, so that the material has good elongation and good carburetor resistance performance.

[0079] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A UV polyurethane acrylate self-repairing coating, characterized in that: The UV polyurethane acrylate self-repairing coating comprises the following components in weight content: The polymerization inhibitor and the catalyst account for 50-200 ppm of the total raw materials, and the diluent monomer accounts for 10-30 parts of the total raw materials.

2. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The polyisocyanate is selected from the group consisting of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, isophorone diisocyanate trimer, an adduct of hexamethylene diisocyanate and trimethylolpropane, cyclohexane dimethylene diisocyanate trimer, an adduct of isophorone diisocyanate and trimethylolpropane, and an adduct of cyclohexane dimethylene diisocyanate and trimethylolpropane, or a combination of several thereof.

3. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The polymer polyol is selected from one or a combination of polycaprolactone diol, polycarbonate diol, polytetramethylene glycol, polyethylene glycol, polypropylene glycol, polybutylene adipate diol, and ethylene oxide-propylene oxide copolymer, and has a molecular weight between 500 and 3000.

4. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The small molecule chain extender is selected from one or a combination of ethylene glycol, 1,2-propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylpentanediol, 1,4-dihydroxymethylcyclohexane, dodecanediol, trimethylolpropane, glycerol, and pentaerythritol.

5. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The acrylate end-capping agent is selected from one or a combination of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, polycaprolactone-modified hydroxyethyl acrylate, polycaprolactone-modified hydroxyethyl methacrylate, trimethylolpropane diacrylate, pentaerythritol triacrylate, and polycaprolactone-modified pentaerythritol triacrylate.

6. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The polymerization inhibitor is selected from one or a combination of hydroquinone and p-hydroxyanisole.

7. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The catalyst is selected from one or a combination of triethylenediamine, bis(dimethylaminoethyl) ether, cyclohexylmethyl tertiary amine, dibutyltin dilaurate, stannous octoate, potassium acetate, lead isooctanoate, zinc isooctanoate, and tetrabutyl titanate.

8. The UV polyurethane acrylate self-repairing coating according to claim 1, characterized in that: The diluent monomer is selected from one or a combination of butyl acrylate, isooctyl acrylate, methyl acrylate, methyl methacrylate, hydroxyethyl acrylate, acrylic acid, tetrahydroglycosyl acrylate, cyclotrimethylolpropane formal acrylate, 3,3,5-trimethylcyclohexyl acrylate, lauric acid acrylate, isobornyl acrylate, isobornyl methacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, tricyclodecyl dimethanol diacrylate, dipropylene glycol diacrylate, polyethylene glycol diacrylate, and polypropylene glycol diacrylate.

9. The method for preparing the UV polyurethane acrylate self-repairing coating according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: (1) First, add polyisocyanate into the reactor, then heat the reactor to 65-70 degrees and start stirring; (2) First, add the melt-dried polymer polyol into the reactor and heat it to 80-85°C for 1-2 hours. Measure the isocyanate content. When the isocyanate content reaches a predetermined value, proceed to the next step of the reaction. (3) First, add the melt-dried small molecule chain extender into the reactor and continue the reaction for 1-2 hours, measure the content of isocyanate groups, and proceed to the next step of reaction when the isocyanate group content reaches a predetermined value; (4) First, the melt-dried acrylate end-capping agent, the diluted monomer dissolved with the inhibitor, and the catalyst are added to the reactor and the reaction is continued for 3-5 hours. The content of the isocyanate group is measured. When the isocyanate group content reaches zero, the reaction is terminated to obtain a UV polyurethane acrylate self-healing coating.

10. An application of the UV polyurethane acrylate self-repairing coating according to claim 9, characterized in that: The applications include car cover films, mobile phone screen protective films, decorative material bonding, and glass curtain wall repair.

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