A high-temperature resistant UV-curable resin and its preparation method

Abstract

The present invention relates to the technical field of UV-curable resins, and discloses a high-temperature resistant UV-curable resin and a preparation method thereof. The UV-curable resin prepared by the present invention comprises 20-30 parts of acrylic resin, 30-40 parts of polyurethane acrylate, 15-25 parts of modified acrylic resin, 4-8 parts of trimethylolpropane triacrylate, 3-10 parts of reinforcing filler, 2-3 parts of photoinitiator, 0.3-0.5 parts of defoaming agent, and 0.5-1 part of leveling agent; it uses acrylic resin, polyurethane acrylic resin and modified acrylic resin as base resins, and is stirred and mixed by adding reinforcing filler, functional additives, etc.; the addition of the reinforcing filler improves the high-temperature resistance and mechanical properties of the matrix; the addition of the modified acrylic resin improves the wettability of the matrix, and further improves the adhesion of the matrix. Therefore, the UV-curable resin of the present invention can be widely applied to fields such as coatings, inks, adhesives, etc.

Description

Technical Field

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

[0002] UV-curable resin is a resin that can be rapidly cured under ultraviolet light irradiation. It is mainly composed of a photoactive prepolymer, an active diluent, and a photosensitizer, including epoxy acrylate, polyurethane acrylate, polyester acrylate, and amino acrylate, etc. UV-curable resin has the characteristics of being milder, more environmentally friendly, and cheaper. Through a photoinitiator, the polymerization of various polymer materials such as olefins, epoxy compounds, or unsaturated resins can be initiated. With the development of ultraviolet light curing technology, the controllability during the polymerization process has increased significantly, and the application has become more and more extensive, such as in the fields of coatings, inks, and adhesives, etc.

[0003] With the increasingly wide application of UV-curable resin, some of its properties no longer meet the actual requirements. For example, under high-temperature environments, problems such as resin discoloration, brittleness, cracking, and substrate damage of UV-curable resin will affect the product quality and appearance. High temperature may also cause the resin to turn yellow or the color to become darker, reducing the transparency and aesthetics of the product; in addition, poor resin wettability will result in limited adhesion of the cured film layer and easy peeling. To address the above shortcomings, preparing a UV-curable resin with high-temperature resistance and good adhesion is what current researchers need to consider. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a high-temperature resistant UV-curable resin and a preparation method thereof.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A high-temperature resistant UV-curable resin, comprising the following raw materials in parts by weight: 20 - 30 parts of acrylic resin, 30 - 40 parts of polyurethane acrylate, 15 - 25 parts of modified acrylic resin, 4 - 8 parts of trimethylolpropane triacrylate, 3 - 10 parts of reinforcing filler, 2 - 3 parts of photoinitiator, 0.3 - 0.5 parts of defoaming agent, and 0.5 - 1 part of leveling agent;

[0007] Further, the photoinitiator is photoinitiator TPO, the defoaming agent is polydimethylsiloxane, and the leveling agent is BYK-333;

[0008] The reinforcing filler is prepared by the following steps:

[0009] Step A1: Mix glass fiber powder and polyvinyl alcohol evenly in deionized water, heat up to 90 - 100 °C, keep the temperature for reaction for 30 - 50 min, then cool down to 45 - 55 °C, add silicone oil and sodium dodecyl sulfate and stir for 1 - 2 h, add glyoxal and 10 wt% hydrochloric acid, react for 0.5 - 1.5 h, centrifuge, wash, and dry to obtain the modified glass fiber;

[0010] Step A2: Disperse the modified glass fiber evenly in deionized water, add melamine, and heat up to 50 - 60 °C and stir for reaction for 3 - 5 h, then add 10 mg / mL sodium cyanoborohydride solution and react for 1 - 2 h, centrifuge, wash, and dry to obtain the reinforced filler;

[0011] Further, in Step A1, the dosage ratio of glass fiber powder, polyvinyl alcohol, deionized water, silicone oil, sodium dodecyl sulfate, glyoxal, and hydrochloric acid is 1 - 3 g : 2 - 5 g : 50 mL : 30 - 50 mL : 1.5 - 3 g : 0.2 - 1 g : 6 - 10 mL;

[0012] Further, in Step A2, the dosage ratio of modified glass fiber, deionized water, melamine, and sodium cyanoborohydride solution is 1 - 3 g : 50 mL : 0.5 - 1.5 g : 5 - 10 mL.

[0013] The modified acrylic resin is prepared by the following steps:

[0014] Step B1: Under nitrogen condition, disperse diethylenetriamine and 4 - trifluoromethylbenzoic acid evenly in N, N - dimethylformamide, heat up to 180 - 200 °C for condensation reflux reaction for 4 - 6 h, then heat up to 220 °C and continue to react for 1.5 - 2.5 h, rotary evaporation to obtain Intermediate Product 1;

[0015] Step B2: Under nitrogen condition, add methanol to Intermediate Product 1, mix and stir evenly, then dropwise add methyl acrylate within 0.5 - 1.5 h, then heat up to 30 - 40 °C and react for 4 - 5 h, rotary evaporation to obtain Intermediate Product 2;

[0016] Step B3: Mix 5 - aminoisophthalic acid evenly in N, N - dimethylformamide, denoted as 5 - aminoisophthalic acid solution; under nitrogen condition, add N, N - dimethylformamide to Intermediate Product 2 and mix and stir evenly, cool down to 0 °C, then slowly add 5 - aminoisophthalic acid solution and stir for 20 min, then heat up to 120 - 140 °C and react for 2 - 3 h, rotary evaporation and drying to obtain the carboxyl - terminated product;

[0017] Step B4: Add bisphenol A epoxy resin, acrylic acid, carboxyl-terminated product, triphenylphosphine, and p-methoxyphenol into a flask in sequence, stir at 85 - 95 °C in an oil bath for 20 - 40 min, then raise the temperature to 110 °C, test the acid value of the system every half hour until the acid value < 1 mg·KOH / g to end the reaction, thus obtaining the modified acrylic resin;

[0018] Further, in step B1, the dosage ratio of diethylenetriamine, 4-trifluoromethylbenzoic acid, and N,N-dimethylformamide is 0.01 - 0.02 mol : 0.02 - 0.04 mol : 100 mL;

[0019] Further, in step B2, the dosage ratio of methyl acrylate, methanol, and diethylenetriamine in step B1 is 0.012 - 0.025 mol : 100 mL : 0.01 - 0.02 mol;

[0020] Further, in step B3, the dosage ratio of 5-aminoisophthalic acid solution, N,N-dimethylformamide, and methyl acrylate in step B2 is 100 mL : 100 mL : 0.012 - 0.025 mol, and the dosage ratio of 5-aminoisophthalic acid and N,N-dimethylformamide in the 5-aminoisophthalic acid solution is 0.01 - 0.02 mol : 100 mL;

[0021] Further, in step B4, the dosage ratio of bisphenol A epoxy resin, acrylic acid, carboxyl-terminated product, triphenylphosphine, and p-methoxyphenol is 15 - 25 g : 3 - 5 g : 2 - 4 g : 0.05 - 0.15 g : 0.01 - 0.02 g.

[0022] A preparation method of a high-temperature resistant UV-curable resin comprises the following steps:

[0023] Weigh raw materials by weight parts, mix and stir evenly acrylic resin, polyurethane acrylate, and modified acrylic resin at 50 - 60 °C, then add reinforcing filler, photoinitiator, defoamer, and leveling agent and stir for 10 min, then stir for 2 - 3 h under nitrogen and at 50 °C, and filter to obtain the high-temperature resistant UV-curable resin.

[0024] Advantages of the present invention:

[0025] The UV-curable resin prepared by the present invention uses acrylic resin, polyurethane acrylate resin, and modified acrylic resin as base resins, and is stirred and mixed by adding reinforcing filler, functional additives, etc.; the addition of the reinforcing filler improves the high-temperature resistance and mechanical properties of the matrix; the addition of the modified acrylic resin improves the wettability of the matrix, and further improves the adhesion of the matrix. Therefore, the UV-curable resin of the present invention can be widely applied to fields such as coatings, inks, adhesives, etc.

[0026] The reinforcing filler is based on glass fiber, with polyvinyl alcohol coated on its surface. Then, by reacting the hydroxyl groups in the polyvinyl alcohol film layer with the aldehyde groups in glyoxal, modified glass fiber is produced. Subsequently, by reacting the aldehyde groups on the surface of the modified glass fiber with the amino groups in melamine, the reinforcing filler is obtained. The introduction of the reinforcing filler can not only improve the high-temperature resistance of the matrix, but also enhance the mechanical properties of the matrix and reduce the production cost of the matrix. Among them, the glass fiber with high-temperature resistance can improve the high-temperature resistance of the matrix because its presence enables the matrix to maintain a stable structure and performance in a high-temperature environment, and is not easily embrittled and deformed. The presence of the polyvinyl alcohol film layer can improve the dispersibility of the glass fiber in the matrix, reduce the agglomeration of the glass fiber in the matrix, and at the same time, utilize its excellent flexibility to improve the mechanical properties of the glass fiber and reduce the embrittlement, cracking, deformation and other phenomena caused by external forces in the matrix. In addition, the introduction of melamine further improves the high-temperature resistance of the matrix because its unique triazine structure makes it have good stability at high temperatures. At the same time, the remaining amino groups on the surface of the reinforcing filler can react with the active groups (epoxy groups, carboxyl groups) in the resin to form a crosslinked structure, thereby improving the strength of the resin.

[0027] In the modified acrylic resin, first, the amidation reaction of diethylenetriamine and 4-trifluoromethylbenzoic acid is used to synthesize intermediate product 1. Then, the reaction of the secondary amine in intermediate product 1 with the double bond in methyl acrylate is used to obtain intermediate product 2. Next, the reaction of the ester group in intermediate product 2 with the amino group in 5-aminophthalic acid is used to prepare the terminal carboxyl product. Finally, the side chain of the epoxy resin is chain-extended with the terminal carboxyl product and capped with acrylic acid to obtain the modified epoxy resin. The introduction of the modified epoxy resin not only has the excellent corrosion resistance, heat resistance and adhesion of the epoxy resin, but also can participate in the ultraviolet curing process of the matrix and improve the curing speed. Among them, the fluorine element introduced into the side chain forms a C-F bond with high bond energy, enabling the resin to maintain stable performance in a high-temperature environment. At the same time, the mutual repulsion between fluorine atoms is used to shield and protect the C-C main chain, thereby improving the chemical corrosion resistance of the resin. The amide bond contained in the side chain and the fluorine element can act synergistically to improve the wettability of the matrix. This is because the fluorine element can reduce the surface tension difference between the matrix and the substrate, improve the wetting ability of the matrix to different substrates, and the polar groups in the amide bond can interact with the polar groups on the surface of the substrate to form strong intermolecular forces, thereby enhancing the wettability of the matrix and further improving the adhesion and durability of the resin to the substrate surface. Specific embodiments

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1: The reinforced filler is prepared by the following steps:

[0030] Step A1: Mix 1 g of glass fiber powder and 2 g of polyvinyl alcohol evenly in 50 mL of deionized water, heat up to 90 °C, keep the temperature for reaction for 30 min, then cool down to 45 °C, add 30 mL of silicone oil and 1.5 g of sodium dodecyl sulfate and stir for 1 h, add 0.2 g of glyoxal and 6 mL of 10 wt% hydrochloric acid, react for 0.5 h, centrifuge, wash, and dry to obtain modified glass fiber;

[0031] Step A2: Disperse 1 g of modified glass fiber evenly in 50 mL of deionized water, add 0.5 g of melamine, and heat up to 50 °C and stir for reaction for 3 h, then add 5 mL of 10 mg / mL sodium cyanoborohydride solution and react for 1 h, centrifuge, wash, and dry to obtain the reinforced filler.

[0032] The modified acrylic resin is prepared by the following steps:

[0033] Step B1: Under nitrogen conditions, disperse 0.01 mol of diethylenetriamine and 0.02 mol of 4-trifluoromethylbenzoic acid evenly in 100 mL of N,N-dimethylformamide, heat up to 180 °C and carry out condensation reflux reaction for 4 h, then heat up to 220 °C and continue to react for 1.5 h, and carry out rotary evaporation to obtain Intermediate Product 1;

[0034] Step B2: Under nitrogen conditions, add 100 mL of methanol to Intermediate Product 1, mix and stir evenly, then dropwise add 0.012 mol of methyl acrylate within 0.5 h, then heat up to 30 °C and react for 4 h, and carry out rotary evaporation to obtain Intermediate Product 2;

[0035] Step B3: Mix 0.01 mol of 5-aminoisophthalic acid evenly in 100 mL of N,N-dimethylformamide, denoted as the 5-aminoisophthalic acid solution; under nitrogen conditions, add 100 mL of N,N-dimethylformamide to Intermediate Product 2 and mix and stir evenly, and cool down to 0 °C, then slowly add 100 mL of the 5-aminoisophthalic acid solution and stir for 20 min, then heat up to 120 °C and react for 2 h, carry out rotary evaporation and drying to obtain the carboxyl-terminal product;

[0036] Step B4: Add 15 g of bisphenol A epoxy resin, 3 g of acrylic acid, 2 g of carboxyl-terminated product, 0.05 g of triphenylphosphine, and 0.01 g of p-methoxyphenol into a flask in sequence, stir for 20 min in an 85°C oil bath, then raise the temperature to 110°C, test the acid value of the system every half hour until the acid value < 1 mg·KOH / g, and then end the reaction to obtain the modified acrylic resin.

[0037] Example 2: The reinforcing filler is prepared by the following steps:

[0038] Step A1: Mix 2 g of glass fiber powder and 3.5 g of polyvinyl alcohol evenly in 50 mL of deionized water, raise the temperature to 95°C, keep the temperature for reaction for 40 min, then cool down to 50°C, add 40 mL of silicone oil and 2.2 g of sodium dodecyl sulfate, stir for 1.5 h, add 0.5 g of glyoxal and 8 mL of 10 wt% hydrochloric acid, react for 1 h, centrifuge, wash, and dry to obtain the modified glass fiber;

[0039] Step A2: Disperse 2 g of the modified glass fiber evenly in 50 mL of deionized water, add 1.1 g of melamine, and raise the temperature to 55°C to stir and react for 4 h, then add 7.5 mL of 10 mg / mL sodium cyanoborohydride solution and react for 1.5 h, centrifuge, wash, and dry to obtain the reinforcing filler.

[0040] The modified acrylic resin is prepared by the following steps:

[0041] Step B1: Under nitrogen atmosphere, disperse 0.015 mol of diethylenetriamine and 0.03 mol of 4-trifluoromethylbenzoic acid evenly in 100 mL of N,N-dimethylformamide, raise the temperature to 190°C for reflux condensation reaction for 5 h, then raise the temperature to 220°C and continue to react for 2 h, and perform rotary evaporation to obtain Intermediate Product 1;

[0042] Step B2: Under nitrogen atmosphere, add 100 mL of methanol to Intermediate Product 1, mix and stir evenly, then dropwise add 0.018 mol of methyl acrylate within 1 h, then raise the temperature to 35°C and react for 4.5 h, and perform rotary evaporation to obtain Intermediate Product 2;

[0043] Step B3: Mix 0.015 mol of 5-aminoisophthalic acid evenly in 100 mL of N,N-dimethylformamide, and denote it as the 5-aminoisophthalic acid solution; under nitrogen atmosphere, add 100 mL of N,N-dimethylformamide to Intermediate Product 2, mix and stir evenly, cool down to 0°C, then slowly add 100 mL of the 5-aminoisophthalic acid solution and stir for 20 min, then raise the temperature to 130°C and react for 2.5 h, perform rotary evaporation and drying to obtain the carboxyl-terminated product;

[0044] Step B4: Add 20 g of bisphenol A epoxy resin, 4 g of acrylic acid, 3 g of carboxyl-terminated product, 0.1 g of triphenylphosphine, and 0.015 g of p-methoxyphenol into a flask in sequence, stir for 30 min in an oil bath at 90 °C, then raise the temperature to 110 °C, test the acid value of the system every half hour until the acid value < 1 mg·KOH / g, and then end the reaction to obtain the modified acrylic resin.

[0045] Example 3: The reinforced filler is prepared by the following steps:

[0046] Step A1: Mix 3 g of glass fiber powder and 5 g of polyvinyl alcohol evenly in 50 mL of deionized water, raise the temperature to 100 °C, keep the temperature for reaction for 50 min, then cool down to 55 °C, add 50 mL of silicone oil and 3 g of sodium dodecyl sulfate, stir for 2 h, add 1 g of glyoxal and 10 mL of 10 wt% hydrochloric acid, react for 1.5 h, centrifuge, wash, and dry to obtain the modified glass fiber;

[0047] Step A2: Disperse 3 g of the modified glass fiber evenly in 50 mL of deionized water, add 1.5 g of melamine, and raise the temperature to 60 °C, stir and react for 5 h, then add 10 mL of 10 mg / mL sodium cyanoborohydride solution and react for 2 h, centrifuge, wash, and dry to obtain the reinforced filler.

[0048] The modified acrylic resin is prepared by the following steps:

[0049] Step B1: Under nitrogen atmosphere, disperse 0.02 mol of diethylenetriamine and 0.04 mol of 4-trifluoromethylbenzoic acid evenly in 100 mL of N,N-dimethylformamide, raise the temperature to 200 °C, carry out condensation reflux reaction for 6 h, then raise the temperature to 220 °C and continue to react for 2.5 h, perform rotary evaporation to obtain Intermediate Product 1;

[0050] Step B2: Under nitrogen atmosphere, add 100 mL of methanol to Intermediate Product 1, mix and stir evenly, then dropwise add 0.025 mol of methyl acrylate within 1.5 h, then raise the temperature to 40 °C, react for 5 h, perform rotary evaporation to obtain Intermediate Product 2;

[0051] Step B3: Mix and stir 0.02 mol of 5-aminoisophthalic acid evenly in 100 mL of N,N-dimethylformamide to obtain the 5-aminoisophthalic acid solution; under nitrogen atmosphere, add 100 mL of N,N-dimethylformamide to Intermediate Product 2, mix and stir evenly, cool down to 0 °C, then slowly add 100 mL of the 5-aminoisophthalic acid solution and stir for 20 min, then raise the temperature to 140 °C and react for 3 h, perform rotary evaporation and drying to obtain the carboxyl-terminated product;

[0052] Step B4: Add 25 g of bisphenol A epoxy resin, 5 g of acrylic acid, 4 g of carboxyl-terminated product, 0.15 g of triphenylphosphine, and 0.02 g of p-methoxyphenol into a flask in sequence, stir for 40 min in an oil bath at 95 °C, then raise the temperature to 110 °C, test the acid value of the system every half hour until the acid value < 1 mg·KOH / g, and then end the reaction to obtain the modified acrylic resin.

[0053] Example 4: A preparation method of a high-temperature resistant UV-curable resin includes the following steps:

[0054] 20 parts of acrylic resin, 30 parts of polyurethane acrylate, 15 parts of the modified acrylic resin prepared in Example 1, 4 parts of trimethylolpropane triacrylate, 3 parts of the strengthened filler prepared in Example 1, 2 parts of photoinitiator TPO, 0.3 part of polydimethylsiloxane, 0.5 part of leveling agent BYK-333;

[0055] Weigh the raw materials by weight parts, mix and stir evenly the acrylic resin, polyurethane acrylate and the modified acrylic resin prepared in Example 1 at 50 °C, then add the strengthened filler, photoinitiator TPO, polydimethylsiloxane and leveling agent BYK-333 prepared in Example 1 and stir for 10 min, and then stir for 2 h under the conditions of nitrogen and 50 °C, and filter to obtain the high-temperature resistant UV-curable resin.

[0056] Example 5: A preparation method of a high-temperature resistant UV-curable resin includes the following steps:

[0057] 25 parts of acrylic resin, 35 parts of polyurethane acrylate, 20 parts of the modified acrylic resin prepared in Example 2, 6 parts of trimethylolpropane triacrylate, 6 parts of the strengthened filler prepared in Example 2, 2.5 parts of photoinitiator TPO, 0.4 part of polydimethylsiloxane, 0.8 part of leveling agent BYK-333;

[0058] Weigh the raw materials by weight parts, mix and stir evenly the acrylic resin, polyurethane acrylate and the modified acrylic resin prepared in Example 2 at 55 °C, then add the strengthened filler, photoinitiator TPO, polydimethylsiloxane and leveling agent BYK-333 prepared in Example 2 and stir for 10 min, and then stir for 2.5 h under the conditions of nitrogen and 50 °C, and filter to obtain the high-temperature resistant UV-curable resin.

[0059] Example 6: A preparation method of a high-temperature resistant UV-curable resin includes the following steps:

[0060] 30 parts of acrylic resin, 40 parts of polyurethane acrylate, 15 parts of the modified acrylic resin prepared in Example 3, 8 parts of trimethylolpropane triacrylate, 10 parts of the strengthened filler prepared in Example 3, 3 parts of photoinitiator TPO, 0.5 part of polydimethylsiloxane, 1 part of leveling agent BYK-333;

[0061] Weigh the raw materials by weight parts. Mix the acrylic resin, polyurethane acrylate and the modified acrylic resin prepared in Example 3 evenly by stirring at 60 °C, then add the reinforcing filler prepared in Example 3, photoinitiator TPO, polydimethylsiloxane and leveling agent BYK-333 and stir for 10 min, and then stir for 3 h under nitrogen and at 50 °C, and filter to obtain the high-temperature resistant UV curable resin.

[0062] Comparative Example 1: This comparative example is a kind of UV curable resin. The difference from Example 6 is that glass fiber powder is used instead of the reinforcing filler prepared in Example 3, and the rest are the same.

[0063] Comparative Example 2: This comparative example is a kind of UV curable resin. The difference from Example 6 is that epoxy resin is used instead of the modified acrylic resin prepared in Example 3, and the rest are the same.

[0064] Spray the UV curable resins prepared in Examples 4-6 and Comparative Examples 1-2 on a transparent PC substrate, put it into a light curing machine, and cure to form a surface-dried film at 800 mJ / cm 2 and conduct performance tests on it:

[0065] Adhesion test: Refer to the national standard GB / T 9286-1998; Hardness test: Refer to the national standard GB / T 6739-2006; High-temperature resistance test: Bake the specimen at 250 °C for 5 min, and observe whether the surface of the specimen falls off or cracks;

[0066] The test results are shown in Table 1:

[0067] Table 1: Performance test results

[0068]

[0069] As can be seen from Table 1, after the UV curable resin prepared by the present invention is tested for adhesion, pencil hardness and high-temperature resistance, the adhesion grades are all Grade 1, the pencil hardness is all 2H, and there is no peeling or cracking under high-temperature conditions, indicating that the UV curable resin has excellent adhesion, pencil hardness and high-temperature resistance.

[0070] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements or use similar methods to replace the specific embodiments described, as long as they do not deviate from the scope defined by the concept of the invention, they should all belong to the protection scope of the present invention.

Claims

1. A high-temperature resistant UV-curable resin, characterized in that, It includes the following raw materials in parts by weight: 20 - 30 parts of acrylic resin, 30 - 40 parts of polyurethane acrylate, 15 - 25 parts of modified acrylic resin, 4 - 8 parts of trimethylolpropane triacrylate, 3 - 10 parts of reinforcing filler, 2 - 3 parts of photoinitiator, 0.3 - 0.5 part of defoamer, and 0.5 - 1 part of leveling agent; The said reinforcing filler is prepared by the following steps: Step A1: Mix glass fiber powder and polyvinyl alcohol evenly in deionized water, heat up to 90 - 100 °C, keep the temperature for reaction for 30 - 50 min, then cool down to 45 - 55 °C, add silicone oil and sodium dodecyl sulfate and stir for 1 - 2 h, add glyoxal and 10 wt% hydrochloric acid, react for 0.5 - 1.5 h, centrifuge, wash, and dry to obtain modified glass fiber; Step A2: Disperse the modified glass fiber evenly in deionized water, add melamine, and heat up to 50 - 60 °C and stir for reaction for 3 - 5 h, then add 10 mg / mL sodium cyanoborohydride solution and react for 1 - 2 h, centrifuge, wash, and dry to obtain the reinforcing filler; The said modified acrylic resin is prepared by the following steps: Step B1: Under the condition of nitrogen, disperse diethylenetriamine and 4 - trifluoromethylbenzoic acid evenly in N, N - dimethylformamide, heat up to 180 - 200 °C for condensation reflux reaction for 4 - 6 h, then heat up to 220 °C and continue to react for 1.5 - 2.5 h, rotary evaporate to obtain intermediate product 1; Step B2: Under the condition of nitrogen, add methanol to intermediate product 1, mix and stir evenly, then dropwise add methyl acrylate within 0.5 - 1.5 h, then heat up to 30 - 40 °C and react for 4 - 5 h, rotary evaporate to obtain intermediate product 2; Step B3: Mix 5 - aminoisophthalic acid evenly in N, N - dimethylformamide, denoted as 5 - aminoisophthalic acid solution; under the condition of nitrogen, add N, N - dimethylformamide to intermediate product 2, mix and stir evenly, and cool down to 0 °C, then slowly add 5 - aminoisophthalic acid solution and stir for 20 min, then heat up to 120 - 140 °C and react for 2 - 3 h, rotary evaporate and dry to obtain the carboxyl - terminated product; Step B4: Add bisphenol A epoxy resin, acrylic acid, carboxyl - terminated product, triphenylphosphine, and p - methoxyphenol into the flask in sequence, and stir at 85 - 95 °C in an oil bath for 20 - 40 min, then heat up to 110 °C, test the acid value of the system every half hour until the acid value < 1 mg·KOH / g to end the reaction, thus obtaining the modified acrylic resin.

2. The high-temperature resistant UV-curing resin according to claim 1, wherein In step A1, the dosage ratio of glass fiber powder, polyvinyl alcohol, deionized water, silicone oil, sodium dodecyl sulfate, glyoxal, and hydrochloric acid is 1 - 3 g : 2 - 5 g : 50 mL : 30 - 50 mL : 1.5 - 3 g : 0.2 - 1 g : 6 - 10 mL.

3. A high-temperature resistant UV-curable resin according to claim 1, characterized in that In step A2, the dosage ratio of modified glass fiber, deionized water, melamine, and sodium cyanoborohydride solution is 1 - 3 g : 50 mL : 0.5 - 1.5 g : 5 - 10 mL.

4. A high-temperature resistant UV curable resin according to claim 1, wherein, The said photoinitiator is photoinitiator TPO, the defoamer is polydimethylsiloxane, and the leveling agent is BYK - 333.

5. A high-temperature resistant UV curable resin according to claim 1, characterized in that, In step B1, the dosage ratio of diethylenetriamine, 4-trifluoromethylbenzoic acid and N,N-dimethylformamide is 0.01 - 0.02 mol : 0.02 - 0.04 mol : 100 mL.

6. A high-temperature resistant UV-curable resin according to claim 1, characterized in that, In step B2, the dosage ratio of methyl acrylate, methanol and diethylenetriamine in step B1 is 0.012 - 0.025 mol : 100 mL : 0.01 - 0.02 mol.

7. A high-temperature resistant UV curable resin according to claim 1, characterized in that, In step B3, the dosage ratio of 5-aminoisophthalic acid solution, N,N-dimethylformamide and methyl acrylate in step B2 is 100 mL : 100 mL : 0.012 - 0.025 mol, and the dosage ratio of 5-aminoisophthalic acid and N,N-dimethylformamide in the 5-aminoisophthalic acid solution is 0.01 - 0.02 mol : 100 mL.

8. A high-temperature resistant UV curable resin according to claim 1, wherein, In step B4, the dosage ratio of bisphenol A epoxy resin, acrylic acid, carboxyl-terminated product, triphenylphosphine and p-methoxyphenol is 15 - 25 g : 3 - 5 g : 2 - 4 g : 0.05 - 0.15 g : 0.01 - 0.02 g.

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