A high-temperature resistant ultraviolet curable coating and its preparation method

Abstract

The present invention relates to the technical field of coating preparation, and particularly relates to a high-temperature resistant ultraviolet curable coating and a preparation method thereof. The preparation method of the high-temperature resistant ultraviolet curable coating is as follows: Aliphatic polyurethane acrylate, reactive monomer, initiator, leveling agent, and additive are mixed evenly and coated on the surface of a substrate, and gradient curing is carried out to obtain the high-temperature resistant ultraviolet curable coating. The additive is nano-silica modified by acrylate. By using linear and branched reactive monomers as reactive monomers in a specific ratio, and then compounding and adding nano-silica modified by linear acrylate, after blending two different initiators and performing gradient curing at different temperatures, the finally prepared ultraviolet curable coating has good high-temperature resistance while also having high hardness. At the same time, it has a large adhesion to the substrate and a high curing degree, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of coating preparation, and particularly to a high-temperature resistant ultraviolet (UV) curable coating and a preparation method thereof. Background Art

[0002] Ultraviolet curable coatings, abbreviated as UV curable coatings, can be cured by inducing the polymerization of their active components through ultraviolet irradiation in a short time. The curing process of UV coatings mainly consists of two steps. First, the photoinitiator will generate free radicals and active cations under ultraviolet irradiation. Then, the free radicals and active cations will induce monomers and active diluents to react and polymerize with unsaturated bonds or epoxy groups, thereby forming the coating. Compared with traditional solvent-based organic coatings, the advantages of UV curable coatings are that during the curing process, all components directly or indirectly participate in the curing reaction, thus not releasing volatile organic compounds (VOCs). In addition, UV coatings also have the characteristics of high curing rate, low energy consumption, and excellent coating performance. For example, the Chinese invention patent with the publication number CN115466566B discloses a UV curable high-temperature resistant optical fiber inner layer coating. This invention prepares a UV curable coating by using a series of polymers. However, in some application environments, the pure organic coating prepared by this invention has certain limitations due to the characteristics of its molecular structure. In terms of hardness, thermal stability, corrosion resistance, etc., the performance of organic coatings is inferior to that of inorganic coatings. In particular, organic coatings will show a relatively high curing shrinkage rate during curing and cannot meet the requirements of some precision applications.

[0003] To solve the above problems, the Chinese invention patent with the publication number CN116102970B discloses a UV curable two-component road marking coating. This invention mainly uses UV curing and is assisted by room temperature curing. Nanometer graphene oxide, glass microspheres, mica powder, titanium dioxide, etc. are added to acrylate. Although the performance of the finished product is improved to a certain extent, in this method, due to the addition of too many inorganic fillers, it is extremely easy to agglomerate in the polymer system and cure unevenly, and ultimately the improvement of the performance of the finished product such as high-temperature resistance is relatively limited.

[0004] Therefore, according to the above related technologies, it is urgent to develop a high-temperature resistant UV curable coating and a preparation method thereof. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a high-temperature resistant UV curable coating and a preparation method thereof to solve the problem of poor high-temperature resistance of UV curable coatings in the prior art.

[0006] Based on the above purpose, the present invention provides a high-temperature resistant UV curable coating and a preparation method thereof.

[0007] A preparation method of a high-temperature resistant ultraviolet curable coating, comprising the following steps:

[0008] Mix aliphatic polyurethane acrylate, reactive monomer, photoinitiator, leveling agent and additives evenly and coat them on the surface of the substrate, with a coating amount of 5-40 g / m 2 , and then carry out gradient curing to obtain a high-temperature resistant ultraviolet curable coating;

[0009] The additive is acrylate-modified nano-silica.

[0010] Preferably, the mass ratio of the aliphatic polyurethane acrylate, reactive monomer, photoinitiator, leveling agent and additive is 35-45:65-75:3-5:0.3-0.5:1-3.

[0011] Preferably, the process of gradient curing is curing at 50°C for 10-15 min, curing at 60°C for 10-15 min, curing at 70°C for 10-15 min, and curing at 80°C for 10-15 min.

[0012] Preferably, the aliphatic polyurethane acrylate is any one of 6145-100 aliphatic polyurethane acrylate, 6195-100 aliphatic polyurethane acrylate and 6196 aliphatic polyurethane acrylate.

[0013] Preferably, the reactive monomer is obtained by mixing tricyclodecane dimethanol diacrylate and pentaerythritol tetraacrylate in a mass ratio of 10.5-13.5:24.5-31.5.

[0014] Preferably, the initiator is obtained by mixing benzophenone and 1-hydroxycyclohexyl phenyl ketone in a mass ratio of 1:1-1.25, and the leveling agent is any one of polyether silicone oil and leveling agent 2746.

[0015] Preferably, the preparation method of the acrylate-modified nano-silica is as follows:

[0016] Step S1. Mix nano-silica particles, γ-methacryloxypropyltrimethoxysilane and 95% ethanol evenly, react for 8-10 h, and dry to obtain alkylated nano-silica;

[0017] Step S2. Mix the alkylated nano-silica, absolute ethanol, methyl methacrylate and initiator evenly, react at 70-75°C for 10-12 h, and then wash and dry to obtain acrylate-modified nano-silica.

[0018] Preferably, in step S1, the dosage ratio of the nano-silica particles, γ-methacryloxypropyltrimethoxysilane and 95% ethanol is 17-22 g:10-15 g:770-820 mL.

[0019] Preferably, the dosage ratio of the alkylated nano-silica, absolute ethanol, methyl methacrylate and initiator in step S2 is 17-22 g: 770-820 mL: 37-42 g: 4-6 g, and the initiator is azobisisobutyronitrile.

[0020] A high-temperature resistant ultraviolet curable coating is prepared by the above preparation method.

[0021] Advantages of the present invention:

[0022] The active monomer provided by the present invention contains both linear and branched acrylates, and the nano-silica modified with linear acrylate is used in combination, so that the finally prepared ultraviolet curable coating has high high-temperature resistance, large hardness, high adhesion to the substrate and high curing degree. Specific embodiments

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0024] Example 1: A preparation method of a high-temperature resistant ultraviolet curable coating, comprising the following steps:

[0025] Step S1. Mix 17 g of nano-silica particles, 10 g of γ-methacryloxypropyltrimethoxysilane and 770 mL of 95% ethanol evenly, react for 8 h, and dry to obtain alkylated nano-silica;

[0026] Step S2. Mix 17 g of alkylated nano-silica, 770 mL of absolute ethanol, 37 g of methyl methacrylate and 4 g of azobisisobutyronitrile evenly, react at 70 °C for 10 h, then wash and dry to obtain acrylate-modified nano-silica;

[0027] Step S3. Mix 10.5 g of tricyclodecane dimethanol diacrylate and 24.5 g of pentaerythritol tetraacrylate to obtain an active monomer;

[0028] Step S4. Mix 10 g of benzophenone and 10 g of 1-hydroxycyclohexyl phenyl ketone to obtain an initiator;

[0029] Step S5. Mix 35 g of 6145-100 aliphatic polyurethane acrylate, 65 g of active monomer, 3 g of photoinitiator, 0.3 g of polyether silicone oil and 1 g of auxiliary agent evenly and coat on the surface of the substrate, and the coating amount is 5 g / m 2, then carry out gradient curing, that is, cure at 50°C for 10 min, 60°C for 10 min, 70°C for 10 min, and 80°C for 10 min to obtain a high-temperature resistant UV-curable coating.

[0030] Example 2: A preparation method of a high-temperature resistant UV-curable coating, comprising the following steps:

[0031] Step S1. Mix 18 g of nano-silica particles, 11 g of γ-methacryloxypropyltrimethoxysilane and 780 mL of 95% ethanol evenly, react for 8.5 h, and dry to obtain alkylated nano-silica;

[0032] Step S2. Mix 18 g of alkylated nano-silica, 780 mL of absolute ethanol, 38 g of methyl methacrylate and 4.5 g of azobisisobutyronitrile evenly, react at 71°C for 10.5 h, then wash and dry to obtain acrylate-modified nano-silica;

[0033] Step S3. Mix 11 g of tricyclodecane dimethanol diacrylate and 26 g of pentaerythritol tetraacrylate to obtain a reactive monomer;

[0034] Step S4. Mix 10 g of benzophenone and 10.5 g of 1-hydroxycyclohexyl phenyl ketone to obtain an initiator;

[0035] Step S5. Mix 37 g of 6195-100 aliphatic polyurethane acrylate, 67 g of reactive monomer, 3.5 g of photoinitiator, 0.35 g of leveling agent 2746 and 1.5 g of auxiliary agent etc. evenly and coat on the surface of the substrate, and the coating amount is 12 g / m 2 , then carry out gradient curing, that is, cure at 50°C for 11 min, 60°C for 11 min, 70°C for 11 min, and 80°C for 11 min to obtain a high-temperature resistant UV-curable coating.

[0036] Example 3: A preparation method of a high-temperature resistant UV-curable coating, comprising the following steps:

[0037] Step S1. Mix 19 g of nano-silica particles, 12 g of γ-methacryloxypropyltrimethoxysilane and 790 mL of 95% ethanol evenly, react for 9 h, and dry to obtain alkylated nano-silica;

[0038] Step S2. Mix 19 g of alkylated nano-silica, 790 mL of absolute ethanol, 39 g of methyl methacrylate and 5 g of azobisisobutyronitrile evenly, react at 72°C for 11 h, then wash and dry to obtain acrylate-modified nano-silica;

[0039] Step S3. Mix 11.5 g of tricyclodecane dimethanol diacrylate and 27.5 g of pentaerythritol tetraacrylate to obtain the reactive monomer;

[0040] Step S4. Mix 10 g of benzophenone and 11 g of 1-hydroxycyclohexyl phenyl ketone to obtain the initiator;

[0041] Step S5. Mix 39 g of 6196 aliphatic polyurethane acrylate, 69 g of reactive monomer, 4 g of photoinitiator, 0.4 g of polyether silicone oil, 2 g of additives, etc. evenly and coat them on the surface of the substrate. The coating amount is 19 g / m 2 , and then carry out gradient curing, that is, cure at 50 °C for 12 min, 60 °C for 12 min, 70 °C for 12 min, and 80 °C for 12 min to obtain the high-temperature resistant UV-curable coating.

[0042] Example 4: A preparation method of a high-temperature resistant UV-curable coating, comprising the following steps:

[0043] Step S1. Mix 20 g of nano-silica particles, 13 g of γ-methacryloxypropyltrimethoxysilane and 800 mL of 95% ethanol evenly, react for 9.5 h, and dry to obtain alkylated nano-silica;

[0044] Step S2. Mix 20 g of alkylated nano-silica, 800 mL of absolute ethanol, 40 g of methyl methacrylate and 5.5 g of azobisisobutyronitrile evenly, react at 73 °C for 11.5 h, then wash and dry to obtain acrylate-modified nano-silica;

[0045] Step S3. Mix 12.5 g of tricyclodecane dimethanol diacrylate and 29 g of pentaerythritol tetraacrylate to obtain the reactive monomer;

[0046] Step S4. Mix 10 g of benzophenone and 11.5 g of 1-hydroxycyclohexyl phenyl ketone to obtain the initiator;

[0047] Step S5. Mix 41 g of 6145-100 aliphatic polyurethane acrylate, 71 g of reactive monomer, 4.5 g of photoinitiator, 0.45 g of leveling agent 2746, 2.5 g of additives, etc. evenly and coat them on the surface of the substrate. The coating amount is 26 g / m 2 , and then carry out gradient curing, that is, cure at 50 °C for 13 min, 60 °C for 13 min, 70 °C for 13 min, and 80 °C for 13 min to obtain the high-temperature resistant UV-curable coating.

[0048] Example 5: A preparation method of a high-temperature resistant UV-curable coating, comprising the following steps:

[0049] Step S1. Mix 21 g of nano-silica particles, 14 g of γ-methacryloxypropyltrimethoxysilane and 810 mL of 95% ethanol evenly, react for 10 h, and dry to obtain alkylated nano-silica;

[0050] Step S2. Mix 21 g of alkylated nano-silica, 810 mL of absolute ethanol, 41 g of methyl methacrylate and 6 g of azobisisobutyronitrile evenly, react at 74 °C for 12 h, then wash and dry to obtain acrylate-modified nano-silica;

[0051] Step S3. Mix 13 g of tricyclodecane dimethanol diacrylate and 30.5 g of pentaerythritol tetraacrylate to obtain a reactive monomer;

[0052] Step S4. Mix 10 g of benzophenone and 12 g of 1-hydroxycyclohexyl phenyl ketone to obtain an initiator;

[0053] Step S5. Mix 43 g of 6195-100 aliphatic polyurethane acrylate, 73 g of reactive monomer, 5 g of photoinitiator, 0.5 g of leveling agent 2746 and 3 g of additives, etc. evenly and coat on the surface of the substrate, and the coating amount is 33 g / m 2 , and then carry out gradient curing, that is, cure at 50 °C for 14 min, 60 °C for 14 min, 70 °C for 14 min, and 80 °C for 14 min to obtain a high-temperature resistant UV-curable coating.

[0054] Example 6: A preparation method of a high-temperature resistant UV-curable coating, comprising the following steps:

[0055] Step S1. Mix 22 g of nano-silica particles, 15 g of γ-methacryloxypropyltrimethoxysilane and 820 mL of 95% ethanol evenly, react for 10 h, and dry to obtain alkylated nano-silica;

[0056] Step S2. Mix 22 g of alkylated nano-silica, 820 mL of absolute ethanol, 42 g of methyl methacrylate and 6 g of azobisisobutyronitrile evenly, react at 75 °C for 12 h, then wash and dry to obtain acrylate-modified nano-silica;

[0057] Step S3. Mix 13.5 g of tricyclodecane dimethanol diacrylate and 31.5 g of pentaerythritol tetraacrylate to obtain a reactive monomer;

[0058] Step S4. Mix 10 g of benzophenone and 12.5 g of 1-hydroxycyclohexyl phenyl ketone to obtain an initiator;

[0059] Step S5. Mix 45 g of 6196 aliphatic polyurethane acrylate, 75 g of reactive monomer, 5 g of photoinitiator, 0.5 g of leveling agent 2746, 3 g of additive, etc. evenly and coat on the surface of the substrate, with a coating amount of 40 g / m 2 , and then perform gradient curing, that is, cure at 50 °C for 15 min, 60 °C for 15 min, 70 °C for 15 min, and 80 °C for 15 min to obtain a high-temperature resistant UV-curable coating.

[0060] Comparative Example 1:

[0061] Compared with Example 1, no additive was added during the preparation of the high-temperature resistant UV-curable coating in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0062] Comparative Example 2:

[0063] Compared with Example 1, only "additive" was replaced with "nano-silica" in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0064] Comparative Example 3: Compared with Example 1, only "acrylate-modified nano-silica" was replaced with "nano-silica grafted with multiple acrylate functional groups" in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0065] Comparative Example 4:

[0066] Compared with Example 1, only "reactive monomer" was replaced with "tricyclodecane dimethanol diacrylate" in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0067] Comparative Example 5:

[0068] Compared with Example 1, only "reactive monomer" was replaced with "pentaerythritol tetraacrylate" in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0069] Comparative Example 6:

[0070] Compared with Example 1, only the dosage of "benzophenone" was increased from "10 g" to "20 g" in this comparative example, and the remaining steps and parameters were the same. This comparative example will not be repeated here, and finally a high-temperature resistant UV-curable coating was obtained.

[0071] Comparative Example 7:

[0072] A preparation method of a high-temperature resistant ultraviolet curable coating, comprising the following steps:

[0073] Step S1. Mix 17 g of nano-silica particles, 10 g of γ-methacryloxypropyltrimethoxysilane, and 770 mL of 95% ethanol evenly, react for 8 h, and dry to obtain alkylated nano-silica;

[0074] Step S2. Mix 17 g of alkylated nano-silica, 770 mL of absolute ethanol, 37 g of methyl methacrylate, and 4 g of azobisisobutyronitrile evenly, react at 70 °C for 10 h, then wash and dry to obtain acrylate-modified nano-silica;

[0075] Step S3. Mix 10.5 g of tricyclodecane dimethanol diacrylate and 24.5 g of pentaerythritol tetraacrylate to obtain a reactive monomer;

[0076] Step S4. Mix 10 g of benzophenone and 10 g of 1-hydroxycyclohexyl phenyl ketone to obtain an initiator;

[0077] Step S5. Mix 35 g of 6145-100 aliphatic polyurethane acrylate, 65 g of reactive monomer, 3 g of photoinitiator, 0.3 g of polyether silicone oil, 1 g of auxiliary agent, etc. evenly and coat on the surface of the substrate, and the coating amount is 5 g / m 2 , and then cure at 80 °C for 30 min to obtain a high-temperature resistant ultraviolet curable coating.

[0078] Performance test:

[0079] Determination of curing degree:

[0080] The curing degree of the high-temperature resistant ultraviolet curable coatings prepared in Examples 1-6 and Comparative Examples 1-7 was determined by infrared spectroscopy: During the curing reaction of the ultraviolet curable system, the characteristic absorption peaks in the infrared spectrum gradually weaken to zero for the unsaturated active groups. That is, the absorption intensity of the characteristic peaks of the unsaturated groups in the system represents the degree of progress of the curing reaction. At the beginning of curing, the characteristic peak intensity is the strongest. In theory, after complete curing, these characteristic peaks will disappear, but it is actually very difficult to achieve. In the acrylate system, usually, the bending vibration peak intensity of the acrylate double bond at 810 cm -1 is used to calculate the curing degree. During the curing process of the acrylate system, the carbonyl group at 1730 cm -1 does not participate in the reaction. Therefore, in order to avoid experimental operation errors, usually, the absorption peak at this place is selected as the reference peak. The calculation formula for the curing degree is as follows:

[0081]

[0082] In the formula:

[0083] X is the degree of curing (%).

[0084] H0(810) and H1(810) are the peak heights of the acrylate double bonds in the system before and after curing at 810 cm -1 respectively.

[0085] H0(1730) and H1(1730) are the peak heights of the carbonyl group at 1730 cm -1 before and after curing.

[0086] Pencil hardness:

[0087] The pencil hardness of the coating is referred to GB / T6739-2006 "Paints and varnishes - Determination of film hardness by pencil test". The pencil hardness of the high-temperature resistant UV-curable coatings prepared in Examples 1 - 6 and Comparative Examples 1 - 7 was tested with a hand-cranked pencil hardness tester. The coating sample was fixed on the test bench. Starting from a harder pencil, the coating sample was moved about 5 mm in the scratch direction. Five scratches were made with each hardness grade pencil at one time. If the coating film was scratched only once or not at all, the hardness value of this grade represented the hardness of the coating film. According to the application requirements of this coating, the hardness value was expressed as the combination of pencil hardness and weight of the weight. For example, 2H / 750g means that when the weight of the weight is 750g, the hardness of the coating is 2H.

[0088] High-temperature resistance (260 °C × 10 min):

[0089] The high-temperature resistant UV-curable coatings prepared in Examples 1 - 6 and Comparative Examples 1 - 7 were formulated into a glue solution, and then the prepared glue solution was coated on the substrate. After curing under an ultraviolet lamp, the substrate was placed on a 260 °C high-temperature platform and baked for 10 min. Observe whether there are cracks, matte surface or blistering and other defects on the cured coating. If there are the above defects, the product appearance is unqualified and the result is NG; otherwise, the result is OK.

[0090] Tensile shear strength:

[0091] The glue solution prepared in Examples 1 - 6 and Comparative Examples 1 - 7 was coated on the lap joint of two PET thin sheets (sheet specifications: length × width × height = 100 mm × 25 mm × 2 mm, specimen lap length was 12.5 mm). After curing on a UV curing machine and standing at room temperature for 24 h, it was then tested on a testing machine. The tensile rate was 50 mm / min. 11 groups of data were tested for each group of specimens, and the result was the arithmetic mean. The tensile shear strength was calculated according to the following formula:

[0092]

[0093] Among them, τ is the tensile shear strength, with the unit of MPa; P is the maximum load at which the specimen is sheared and damaged, with the unit of N; B is the width of the lap joint surface of the specimen, with the unit of mm; L is the length of the lap joint surface of the specimen, with the unit of mm;

[0094] Adhesion:

[0095] The adhesion was tested according to GB / T9286-1998 "Specification Tests for Paints and Varnishes - Films". Small grids of 10×10 were vertically scratched on the coating surface with a cutter, and adhered with 3M tape to make the tape in good contact with the cut surface. The adhesive tape was quickly peeled off at an angle close to 60°. The cutting area of the coating was observed, and the test surface was classified. The best is grade 0. The results are shown in Table 1 below:

[0096] Table 1

[0097]

[0098]

[0099] Data analysis:

[0100] It can be seen from Table 1 that the high-temperature resistant UV-curable coatings prepared in Examples 1 - 6 of the present invention have high curing degree, large pencil hardness, good high-temperature resistance, high tensile shear strength, and good adhesion. This is because the active monomers provided by the present invention contain both linear and branched acrylates, and the nano-silica modified with linear acrylate is used in combination, which can take into account both the hardness and high-temperature resistance of the final product. Moreover, the nano-silica modified with linear acrylate can be evenly dispersed in the system, further enhancing the performance of the product. By optimizing the type and dosage of the photoinitiator, making the content of benzophenone slightly less than that of 1-hydroxycyclohexyl phenyl ketone, the reaction of benzophenone can be completed, and the curing degree of the product can be improved. Therefore, the UV-curable coating finally prepared by the present invention has broad application prospects.

[0101] Those of ordinary skill in the art should understand that the discussion of any above embodiment is only exemplary, and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0102] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a high temperature resistant ultraviolet curing coating, characterized in that: The following steps are involved: Mix aliphatic polyurethane acrylate, active monomer, photoinitiator, leveling agent and additives evenly and apply them on the surface of the substrate. The coating amount is 5-40g / m 2 , and then gradient curing is performed to obtain a high temperature resistant UV curing coating; The mass ratio of the aliphatic polyurethane acrylate, the active monomer, the initiator, the leveling agent and the auxiliary agent is 35-45:65-75:3-5:0.3-0.5:1-3; The active monomer is obtained by mixing tricyclodecane dimethanol diacrylate and pentaerythritol tetraacrylate in a mass ratio of 10.5-13.5:24.5-31.5; The photoinitiator is obtained by mixing benzophenone and 1-hydroxycyclohexyl phenyl ketone in a mass ratio of 1:1-1.25; The auxiliary agent is acrylate-modified nano-silicon dioxide; The preparation method of the acrylate-modified nano-silica is as follows: Step S1. Evenly mix nano-silica particles, γ-methacryloxypropyltrimethoxysilane and 95% ethanol, react for 8-10 hours, and dry to obtain alkylated nano-silica; Step S2. The alkylated nano-silica, anhydrous ethanol, methyl methacrylate and initiator are mixed evenly, reacted at 70-75° C. for 10-12 hours, and then washed and dried to obtain acrylate-modified nano-silica; The gradient curing process is curing at 50°C for 10-15min, curing at 60°C for 10-15min, curing at 70°C for 10-15min, and curing at 80°C for 10-15min; The amount ratio of the nano-silica particles, γ-methacryloxypropyltrimethoxysilane and 95% ethanol in step S1 is 17-22 g: 10-15 g: 770-820 mL; The usage ratio of the alkylated nano-silica, anhydrous ethanol, methyl methacrylate and initiator in step S2 is 17-22 g: 770-820 mL: 37-42 g: 4-6 g, and the initiator is azobisisobutyronitrile.

2. The method for preparing a high temperature resistant UV curing coating according to claim 1, characterized in that: The aliphatic polyurethane acrylate is any one of 6145-100 aliphatic polyurethane acrylate, 6195-100 aliphatic polyurethane acrylate and 6196 aliphatic polyurethane acrylate.

3. The method for preparing a high temperature resistant UV curing coating according to claim 1, characterized in that: The leveling agent is any one of polyether silicone oil and leveling agent 2746.

4. A high temperature resistant UV curing coating, characterized in that: The high temperature resistant UV curing coating is prepared by the preparation method described in any one of claims 1 to 3.

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