High-temperature-resistant cyano resin composite material and preparation method thereof

Abstract

The invention relates to the technical field of materials, and discloses a high-temperature-resistant cyano resin composite material and a preparation method thereof.The high-temperature-resistant cyano resin composite material is prepared by adding melamine resin, cyano-containing modified benzoxazine and glass fibers into a double-screw extruder, conducting melt blending, extruding master batches and then conducting injection molding through an injection molding machine. A quaternary ammonium salt group in cyano-containing modified benzoxazine has a better antibacterial effect, a triazine group in the cyano-containing modified benzoxazine has a better high-temperature-resistant effect, carboxyl in N-methyl imino diacetic acid and hydroxyl in 2, 4-anilino-6-(phenol ethyl ester amine) s-triazine are subjected to an esterification reaction, and triazinyl N-methyl imino diethyl ester is obtained. Meanwhile, the substitution degree of triazinyl is improved, so that the temperature resistance effect is better; the sulfur element contained in the flame-retardant plastic has a good flame-retardant effect; wherein benzoxazine can form a heat-resistant phenolic resin structure at a high temperature, so that the flame retardant has a relatively good flame retardant effect.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to a high-temperature resistant cyano resin composite material and a preparation method thereof. Background Art

[0002] With the development of society, cabin and other structural parts are required to have good high temperature resistance. Although traditional titanium alloys have good high temperature resistance, they are heavy and costly. Moreover, during long-term use, bacteria will corrode them, causing them to be unable to be used normally. Therefore, how to avoid this phenomenon is the key to solving the problem. For example, patent CN106905529 discloses a bismaleimide resin containing cyano and fluorene groups and its preparation method. The invented product has good solubility, strong adhesion, and excellent toughness and heat resistance; however, its antibacterial effect has not been improved. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a high temperature resistant cyano resin composite material and a preparation method thereof, which has good high temperature resistance, flame retardancy and antibacterial effects.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature resistant cyano resin composite material and a preparation method thereof, a high-temperature resistant cyano resin composite material, comprising the following weight components: 30-50 parts by weight of melamine resin, 1-1.2 parts by weight of cyano-modified benzoxazine, and 0.8-1.1 parts by weight of glass fiber.

[0007] Preferably, the preparation method of the sulfur-containing modified benzoxazine is:

[0008] (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 80-95° C. for 9-12 hours, cooling after reaction, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid;

[0009] (2) Add triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, react at 75-86° C. for 6-8 hours, cool, distill under reduced pressure, and wash to obtain intermediate 1;

[0010] (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, irradiating with 365 nm ultraviolet light at 20-40° C. for 2-4 h, centrifuging, washing and drying to obtain intermediate 2;

[0011] (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring and dissolving, adding pyridine catalyst, reacting at 95-100° C. for 4-7 hours, filtering and washing after completion to obtain a phenol-based sulfur-containing modified triazine;

[0012] (5) Add 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenol-based sulfur-modified triazine into a toluene solvent, fully dissolve them, and carry out a cyclization reaction at 65-90° C. for 10-14 hours. After the reaction, distill under reduced pressure, wash with deionized water, and recrystallize the crude product from dichloromethane to obtain a cyano-modified benzoxazine.

[0013] In the above reaction process, the carboxyl group in N-methylimidodiacetic acid and the hydroxyl group in 2,4-anilino-6-(phenolethyl ester amine) triazine are subjected to esterification reaction to generate an ester group, and a tertiary amine group is introduced to obtain triazine N-methylimidodiacetic acid; the quaternization reaction is continued with the chlorine in 3-chloropropylene to generate a quaternary ammonium salt group, and an olefin group is introduced to obtain intermediate 1; the olefin group is further subjected to a click reaction with the thiol group in mercaptoethylamine to introduce an amine group to obtain intermediate 2; the amine group is reacted with 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride to introduce a phenolic hydroxyl group to obtain a phenolic sulfur-containing modified triazine; 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenolic sulfur-containing modified triazine are reacted to finally obtain a cyano-containing modified benzoxazine.

[0014] Preferably, in (1), the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolethyl ester amine)-triazine is 1:0.62-0.85.

[0015] Preferably, the mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene in (2) is 1:2.3-3.5.

[0016] Preferably, the mass ratio of the intermediate 1, mercaptoethylamine and benzoin dimethyl ether photoinitiator in (3) is 1:2.6-3.2:0.011-0.014.

[0017] Preferably, the mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2, and pyridine catalyst in (4) is 1.4-1.6:1:0.021-0.023.

[0018] Preferably, the mass ratio of 3-aminophthalonitrile, aqueous formaldehyde solution and phenol-based sulfur-modified triazine in (5) is 1:1.4-1.6:1.1-1.2.

[0019] Preferably, the preparation method of the high temperature resistant cyano resin composite material is: adding melamine resin, cyano-modified benzoxazine, and glass fiber into a twin-screw extruder, melt blending and extruding masterbatch at 230-240° C., and then injection molding with an injection molding machine to obtain the high temperature resistant cyano resin composite material.

[0020] (III) Beneficial technical effects

[0021] The invention prepares a high temperature resistant cyano resin composite material by adding melamine resin and cyano modified benzoxazine into a twin-screw extruder, melt blending, extruding master batches, and then injection molding by an injection molding machine.

[0022] The quaternary ammonium salt group in the cyano-modified benzoxazine has a good antibacterial effect, and the triazine group therein has a good high temperature resistance effect. The carboxyl group in N-methyliminodiacetic acid and the hydroxyl group in 2,4-anilino-6-(phenolethyl ester amine)-triazine are subjected to esterification reaction to obtain triazine N-methyliminodiacetic acid, and at the same time, the substitution degree of the triazine group is increased, making it more heat-resistant; the sulfur element contained therein can promote the formation of a carbon layer on the surface of the polymer at high temperature, and this carbon layer can serve as a barrier layer for heat and oxygen, thereby slowing down the combustion speed and playing a flame retardant role; the benzoxazine therein will form a heat-resistant phenolic resin structure at high temperature, so that it has a good flame retardant effect. DETAILED DESCRIPTION

[0023] 2,4-anilino-6-(phenolylethyl ester amine)-s-triazine was prepared according to the literature "Synthesis and antitumorevaluation of a novel series of triaminotriazine derivatives".

[0024] The reaction bottle was placed in a low-temperature reactor, and acetone solvent, 1 mmol cyanuric chloride, 2 mmol aniline, and 2 mmol sodium carbonate were added at 0°C. After stirring, the mixture was reacted at room temperature for 8 hours. The solvent was concentrated, washed with petroleum ether, and recrystallized in acetone to obtain 2,4-anilino-6-chloro-s-triazine.

[0025] Add 0.84 mmol 2,4-anilino-6-chloro-s-triazine, 0.84 mmol ethanolamine and 0.84 mmol potassium carbonate to acetone, react at room temperature for 5 hours, concentrate the solvent, add ice water and ethyl acetate for extraction, dry the organic phase, concentrate, and separate by silica gel column chromatography to obtain 2,4-anilino-6-(phenylethyl ester amine)-triazine.

[0026] The molecular weight of the melamine resin is 5000. The mass fraction of the formaldehyde aqueous solution is 36%.

[0027] Example 1

[0028] (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, wherein the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolylethyl ester amine)-triazine is 1:0.62, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 80° C. for 9 hours, cooling after completion, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid;

[0029] (2) adding triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, wherein the mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene is 1:2.3, reacting at 75° C. for 6 h, cooling after reaction, distilling under reduced pressure, and washing to obtain intermediate 1;

[0030] (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, and then adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, wherein the mass ratio of intermediate 1, mercaptoethylamine, and benzoin dimethyl ether photoinitiator is 1:2.6:0.011, irradiating with 365 nm ultraviolet light at 20° C. for 2 h, centrifuging after the end, washing and drying to obtain intermediate 2;

[0031] (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring to dissolve, adding a pyridine catalyst, wherein the mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2, and pyridine catalyst is 1.4:1:0.021, reacting at 95° C. for 4 h, filtering after completion, washing, and obtaining a phenol-based sulfur-containing modified triazine;

[0032] (5) adding 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenolic sulfur-containing modified triazine to a toluene solvent, wherein the mass ratio of 3-aminophthalonitrile, the aqueous solution of formaldehyde, and the phenolic sulfur-containing modified triazine is 1:1.4:1.1, fully dissolving, and carrying out a cyclization reaction at 65° C. for 10 h. After completion, distilling under reduced pressure, washing with deionized water, and recrystallizing the crude product from dichloromethane to obtain a cyano-modified benzoxazine;

[0033] (6) 30 parts by weight of melamine resin, 1 part by weight of cyano-modified benzoxazine, and 0.8 parts by weight of glass fiber are added to a twin-screw extruder, melt-blended and extruded into a masterbatch at 230° C., and then injection-molded using an injection molding machine to obtain a high-temperature resistant cyano resin composite material.

[0034] Example 2

[0035] (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, wherein the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolylethyl ester amine)-triazine is 1:0.85, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 95° C. for 12 hours, cooling after completion, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid;

[0036] (2) adding triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, wherein the mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene is 1:3.5, reacting at 86° C. for 8 h, cooling after reaction, distilling under reduced pressure, and washing to obtain intermediate 1;

[0037] (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, and then adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, wherein the mass ratio of intermediate 1, mercaptoethylamine, and benzoin dimethyl ether photoinitiator is 1:3.2:0.014, irradiating with 365 nm ultraviolet light at 40° C. for 4 h, centrifuging after the end, washing and drying to obtain intermediate 2;

[0038] (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring to dissolve, adding a pyridine catalyst, wherein the mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2, and pyridine catalyst is 1.6:1:0.023, reacting at 100° C. for 7 h, filtering after completion, washing, and obtaining a phenol-based sulfur-containing modified triazine;

[0039] (5) adding 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenolic sulfur-containing modified triazine to a toluene solvent, wherein the mass ratio of 3-aminophthalonitrile, the aqueous solution of formaldehyde, and the phenolic sulfur-containing modified triazine is 1:1.6:1.2, and fully dissolving them to carry out a cyclization reaction at 90° C. for 14 h. After completion, distillation under reduced pressure is performed, the product is washed with deionized water, and the crude product is recrystallized from dichloromethane to obtain a cyano-modified benzoxazine;

[0040] (6) 50 parts by weight of melamine resin, 1.2 parts by weight of cyano-modified benzoxazine, and 1.1 parts by weight of glass fiber are added to a twin-screw extruder, melt-blended and extruded into a masterbatch at 240° C., and then injection-molded using an injection molding machine to obtain a high-temperature resistant cyano resin composite material.

[0041] Example 3

[0042] (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, wherein the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolylethyl ester amine)-triazine is 1:0.73, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 87° C. for 10 hours, cooling after completion, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid;

[0043] (2) adding triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, wherein the mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene is 1:2.9, reacting at 70° C. for 7 h, cooling after reaction, distilling under reduced pressure, and washing to obtain intermediate 1;

[0044] (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, and then adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, wherein the mass ratio of intermediate 1, mercaptoethylamine, and benzoin dimethyl ether photoinitiator is 1:2.9:0.012, irradiating with 365 nm ultraviolet light at 30° C. for 3 h, centrifuging after the end, washing and drying to obtain intermediate 2;

[0045] (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring to dissolve, adding a pyridine catalyst, wherein the mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2, and pyridine catalyst is 1.5:1:0.022, reacting at 97° C. for 5 h, filtering after completion, washing, and obtaining a phenol-based sulfur-containing modified triazine;

[0046] (5) adding 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenol-based sulfur-containing modified triazine to a toluene solvent, wherein the mass ratio of 3-aminophthalonitrile, the aqueous solution of formaldehyde, and the phenol-based sulfur-containing modified triazine is 1:1.5:1.15, fully dissolving, and carrying out a cyclization reaction at 77° C. for 12 h. After completion, distillation under reduced pressure is performed, the product is washed with deionized water, and the crude product is recrystallized from dichloromethane to obtain a cyano-containing modified benzoxazine;

[0047] (6) 40 parts by weight of melamine resin, 1.1 parts by weight of cyano-modified benzoxazine, and 0.9 parts by weight of glass fiber were added into a twin-screw extruder, melt-blended and extruded into a masterbatch at 235° C., and then injection-molded using an injection molding machine to obtain a high-temperature resistant cyano resin composite material.

[0048] Example 4

[0049] (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, wherein the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolylethyl ester amine)-triazine is 1:0.62, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 80° C. for 9 hours, cooling after completion, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid;

[0050] (2) adding triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, wherein the mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene is 1:2.3, reacting at 75° C. for 6 h, cooling after reaction, distilling under reduced pressure, and washing to obtain intermediate 1;

[0051] (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, and then adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, wherein the mass ratio of intermediate 1, mercaptoethylamine, and benzoin dimethyl ether photoinitiator is 1:3.2:0.014, irradiating with 365 nm ultraviolet light at 40° C. for 4 h, centrifuging after the end, washing and drying to obtain intermediate 2;

[0052] (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring to dissolve, adding a pyridine catalyst, wherein the mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2, and pyridine catalyst is 1.6:1:0.023, reacting at 100° C. for 7 h, filtering after completion, washing, and obtaining a phenol-based sulfur-containing modified triazine;

[0053] (5) adding 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenol-based sulfur-containing modified triazine to a toluene solvent, wherein the mass ratio of 3-aminophthalonitrile, the aqueous solution of formaldehyde, and the phenol-based sulfur-containing modified triazine is 1:1.5:1.15, fully dissolving, and carrying out a cyclization reaction at 77° C. for 12 h. After completion, distillation under reduced pressure is performed, the product is washed with deionized water, and the crude product is recrystallized from dichloromethane to obtain a cyano-containing modified benzoxazine;

[0054] (6) 40 parts by weight of melamine resin, 1.1 parts by weight of cyano-modified benzoxazine, and 0.8 parts by weight of glass fiber were added into a twin-screw extruder, melt-blended and extruded into a masterbatch at 235° C., and then injection-molded using an injection molding machine to obtain a high-temperature resistant cyano resin composite material.

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 4 is that a phenol-based sulfur-modified triazine is used instead of a cyano-modified benzoxazine.

[0057] The thermal properties of the high temperature resistant cyano resin composite material were tested by a thermogravimetric analyzer in a nitrogen atmosphere, with a heating rate of 25°C / min and a maximum temperature of 800°C. The limiting oxygen index of the material was tested using an oxygen index meter, and the combustion grade of the material was tested using a horizontal vertical combustion instrument. The test results are shown in Table 1.

[0058] Table 1: High temperature resistance test and flame retardancy test.

[0059]

[0060] It can be seen from Table 1 that Examples 1-4 of the present invention have better flame retardancy than Comparative Example 1, and the temperatures at which the mass loss of Comparative Example 1 is 20% and 50% are lower than those of Examples 1-4, indicating that the cyano resin composite material of the present invention has better high temperature resistance.

[0061] A Staphylococcus aureus liquid with a concentration of 2×108 CFU / mL was added to a sterilized culture dish as a test strain, and then a solid agar medium was added and dissolved, cooled to 45°C, and then poured into the culture dish, 20 mL was poured into each plate with an inner diameter of 10 cm, and then the materials of the embodiments of the present invention and the comparative example (with a diameter of 3 cm and a thickness of 1 mm) were placed on the culture plate, and cultured in a constant temperature incubator for 12 hours at a temperature of 37°C. After culture, the diameter of the inhibition zone was measured. The test results are shown in Table 2.

[0062] Table 2: Antimicrobial testing.

[0063]

[0064]

[0065] It can be seen from Table 2 that the cyano resin composite material embodiments 1-4 of the present invention have better antibacterial effects than the comparative example 1.

[0066] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high temperature resistant cyano resin composite material, characterized in that: The invention comprises the following components by weight: 30-50 parts by weight of melamine resin, 1-1.2 parts by weight of cyano-modified benzoxazine and 0.8-1.1 parts by weight of glass fiber.

2. The high temperature resistant cyano resin composite material according to claim 1, characterized in that: The preparation method of the sulfur-containing modified benzoxazine is: (1) adding N-methyliminodiacetic acid and 2,4-anilino-6-(phenolylethyl ester amine)-triazine to an acetonitrile solvent, stirring and mixing, continuously adding p-toluenesulfonic acid catalyst, reacting at a temperature of 80-95° C. for 9-12 hours, cooling after reaction, concentrating under reduced pressure, and washing to obtain triazine N-methyliminodiacetic acid; (2) Add triazine N-methyliminodiethyl ester and 3-chloropropylene to N,N-dimethylformamide solvent, react at 75-86° C. for 6-8 hours, cool, distill under reduced pressure, and wash to obtain intermediate 1; (3) adding intermediate 1 to N,N-dimethylformamide solvent, stirring and dispersing, adding mercaptoethylamine and benzoin dimethyl ether photoinitiator, irradiating with 365 nm ultraviolet light at 20-40° C. for 2-4 h, centrifuging, washing and drying to obtain intermediate 2; (4) adding 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride and intermediate 2 to an ether solvent, stirring and dissolving, adding pyridine catalyst, reacting at 95-100° C. for 4-7 hours, filtering and washing after completion to obtain a phenol-based sulfur-containing modified triazine; (5) Add 3-aminophthalonitrile, an aqueous solution of formaldehyde, and a phenol-based sulfur-modified triazine into a toluene solvent, fully dissolve them, and carry out a cyclization reaction at 65-90° C. for 10-14 hours. After the reaction, distill under reduced pressure, wash with deionized water, and recrystallize the crude product from dichloromethane to obtain a cyano-modified benzoxazine.

3. The high temperature resistant cyano resin composite material according to claim 2, characterized in that: In the (1), the mass ratio of N-methyliminodiacetic acid to 2,4-anilino-6-(phenolethyl ester amine)-triazine is 1:0.62-0.

85.

4. The high temperature resistant cyano resin composite material according to claim 2, characterized in that: The mass ratio of triazine N-methyliminodiethyl ester to 3-chloropropylene in (2) is 1:2.3-3.

5.

5. The high temperature resistant cyano resin composite material according to claim 2, characterized in that: The mass ratio of the intermediate 1, mercaptoethylamine and benzoin dimethyl ether photoinitiator in (3) is 1:2.6-3.2:0.011-0.

014.

6. The high temperature resistant cyano resin composite material according to claim 2, characterized in that: The mass ratio of 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride, intermediate 2 and pyridine catalyst in (4) is 1.4-1.6:1:0.021-0.

023.

7. The high temperature resistant cyano resin composite material according to claim 2, characterized in that: The mass ratio of 3-aminophthalonitrile, formaldehyde aqueous solution and phenol-based sulfur-containing modified triazine in (5) is 1:1.4-1.6:1.1-1.

2.

8. A method for preparing a high temperature resistant cyano resin composite material according to any one of claims 1 to 7, characterized in that: The preparation method of the high temperature resistant cyano resin composite material comprises: adding melamine resin, cyano-modified benzoxazine and glass fiber into a twin-screw extruder, melt blending and extruding masterbatch at 230-240° C., and then injection molding by an injection molding machine to obtain the high temperature resistant cyano resin composite material.

Images