High-temperature-resistant nylon composite material and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant nylon composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following components in parts by weight: 100 parts of nylon 66 resin, 13 to 18 parts of modified aerogel filler, 1.6 to 2.2 parts of a lubricant, 0.12 to 0.15 part of an antioxidant and 0.2 to 0.3 part of a light stabilizer, according to the modified aerogel filler, silica-based aerogel powder is used as a matrix, surface amino groups are introduced through coupling modification of a silane coupling agent KH-550, an oligomer with a main chain containing a polyphenol oxygen chain is formed through a ring-opening reaction of p-hydroxydiphenyl ether and epoxy chloropropane, and an excessive epoxy structure is used for blocking, so that the modified aerogel filler is prepared. Finally, ring opening is carried out on active amino grafted on the surface of the aminated aerogel, polymer coating of a polyphenol oxygen block is formed on the surface of aerogel particles in situ, ordered arrangement and crystallization of macromolecular chains of a nylon 66 matrix are promoted, internal defects are reduced, and then the composite material is not prone to stress creep at the high temperature.

Description

Technical Field

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

[0002] Polyamide, also known as nylon, is a polymer containing amide groups in the main chain repeating units of the molecule. It is widely used in various fields of industrial production due to its excellent comprehensive performance. With the development direction of lightweight automobiles, higher requirements are placed on the performance of materials. In the automotive industry, the development goals of lightweight and low-carbon environmental protection require the use of polymer materials to partially replace metal alloys, such as the fuel system, exhaust system and cooling system of automobile engines, which requires the replacement materials to have excellent heat resistance.

[0003] In the polyamide family, there is a class of products with excellent high temperature resistance, and its melting temperature is close to or exceeds 300℃, such as PA6T (polyhexamethylene terephthalamide) with a melting point of 370℃, and PA10T (polydecamethylene terephthalamide) with a melting point of 316℃. Although this type of nylon material has extremely high high temperature resistance, it maintains stable mechanical properties and structural stability at the melting point temperature, which can just meet the requirements of lightweight, high temperature resistance and dimensional stability; however, its processing and molding are difficult, and the structural requirements of the product are high, which is difficult to meet the actual production needs. In comparison, nylon 66 (polyhexamethylene adipamide) has good comprehensive mechanical properties, a melting point of about 260℃, and good plasticity. However, the stress creep of nylon 66 at high temperature is more obvious. When used in high temperature environments, such as in automobile engine components, it is easy to deform, affecting the structural stability of the product, which greatly limits the application of nylon products. Summary of the invention

[0004] In order to solve the technical problems mentioned in the background technology, the object of the present invention is to provide a high temperature resistant nylon composite material and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high temperature resistant nylon composite material comprises the following raw materials in parts by weight: 100 parts of nylon 66 resin, 13-18 parts of modified aerogel filler, 1.6-2.2 parts of lubricant, 0.12-0.15 parts of antioxidant and 0.2-0.3 parts of light stabilizer.

[0007] The modified aerogel filler is prepared by the following method:

[0008] Step A1: premix the silane coupling agent KH-550 and ethanol aqueous solution, acidify with hydrochloric acid to a pH value of 3-4 and stir for hydrolysis for 30-50 minutes, add aerogel powder for ultrasonic dispersion, and then stir for coupling for 4-5 hours. After the reaction is completed, filter, wash and dry to obtain amino aerogel;

[0009] Furthermore, the fineness of the aerogel powder is 150-200 meshes, and it has good redispersibility in the composite material.

[0010] Furthermore, the feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:1.7-2.2g:80-100mL, the silane coupling agent KH-550 is hydrolyzed and coupled with the surface of aerogel powder to introduce surface amino treatment.

[0011] Step A2: p-Hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate are mixed, heated to 65-75° C., stirred and reacted for 2-3 hours, and then sodium hydroxide is added intermittently to continue the reaction for 8-10 hours. After the reaction is completed, the mixture is filtered and rotary evaporated, the substrate is washed with water and vacuum dried to obtain a modifier;

[0012] Furthermore, the feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:22-25mmol:10-15mg:0.8-1g:20-25mL, and tetrabutylammonium bromide and sodium hydroxide are used as promoters to make p-hydroxydiphenyl ether and epichlorohydrin undergo a ring-opening reaction to form an oligomer having a polyphenol oxide chain in the main chain, which is terminated with an excess of epoxy structure.

[0013] Step A3: pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the amino aerogel and ultrasonically disperse it, introduce nitrogen protection, pre-heat to 40-55°C and stir to react for 1-1.5h, then continue to heat to 110-130°C and reflux for 20-30min, cool after the reaction, filter, and vacuum dry the substrate to obtain a modified aerogel filler;

[0014] Furthermore, the feed ratio of the aminated aerogel, the modifier, triethylamine and dimethylacetamide is 50 g: 2.5-3.3 g: 8-12 mL: 60-70 mL, and triethylamine is used as a promoter, so that the modifier and the grafted active amino groups on the surface of the aminated aerogel are ring-opened, and a polymer coating of polyphenol oxide blocks is formed in situ on the surface of the aerogel particles.

[0015] A preparation method of a high temperature resistant nylon composite material comprises the following steps: uniformly mixing nylon 66 resin, a lubricant, an antioxidant and a light stabilizer in a high speed mixer, melt-extruding the mixture and adding a modified aerogel filler from a side feed port for compounding, cooling the discharged material and granulating the material to obtain the high temperature resistant nylon composite material.

[0016] Furthermore, the lubricant is compounded from silicone powder and polytetrafluoroethylene powder, has a good lubricating effect at high temperature, and is beneficial to the dispersion of the modified aerogel filler and the molding of the composite material.

[0017] Furthermore, during the melt extrusion process, the barrel temperature zones are set to: zone one 240-260°C, zone two 260-280°C, zone three 270-280°C, zone four 290-300°C, zone five 290-300°C, zone seven 280-290°C, zone eight 270-280°C, and die head 260-270°C; multi-zone slow heating is adopted to facilitate uniform heating of the melt.

[0018] Beneficial effects of the present invention:

[0019] The present invention uses nylon 66 as a matrix material. Compared with the existing high-melting-point and high-temperature resistant nylon materials, the present invention has good processability and can be formed by injection molding, compression molding and other methods to meet the manufacturing requirements of complex structural products, and has higher designability and applicability. The present invention introduces a modified aerogel filler composite by blending to effectively improve the high-temperature stress creep problem of nylon 66 materials. The present invention uses silica-based aerogel powder as a matrix, introduces surface amino groups by coupling modification with a silane coupling agent KH-550, forms an oligomer containing a polyphenol oxygen chain in the main chain by a ring-opening reaction of p-hydroxydiphenyl ether and epichlorohydrin, and ends with an excess of epoxy structure, and finally opens the ring with the grafted active amino groups on the surface of the amino-treated aerogel. A polymer coating of polyphenol oxide blocks is formed in situ on the surface of aerogel particles; the modified aerogel filler is blended in a nylon 66 matrix, and the polyphenol oxide segments on its surface form hydrogen bonds with the amide structures in the nylon 66 macromolecules, so that the compatibility of the modified aerogel filler with the nylon 66 matrix is ​​improved, and it is easier to disperse into the nylon 66 matrix during the blending process. At the same time, the polyphenol oxide segments serve as templates for hydrogen bond formation, which promote the orderly arrangement of nylon macromolecular chains. The aerogel particles contain a large number of microscopic pores, which slow down the cooling rate of the melt, which is conducive to the full arrangement of nylon macromolecular chains, thereby forming uniform crystallization. In addition, the internal defects of the composite material are reduced, so that the composite material is not prone to stress creep at high temperatures. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1, preparation of high temperature resistant nylon composite material, specifically as follows:

[0022] (1) Preparation of modified aerogel fillers

[0023] Step A1: prepare a 40% volume fraction of ethanol aqueous solution, premix the silane coupling agent KH-550 and the ethanol aqueous solution, add hydrochloric acid for acidification, control the pH value to 4, apply 120rpm stirring for hydrolysis for 30min, add aerogel powder and ultrasonically disperse it at 25kHz for 5min, then switch to 60rpm stirring for coupling for 4h, wherein the aerogel powder is selected from a silica aerogel powder with a fineness of 150 mesh, and the feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:1.7g:80mL. After the reaction is completed, filter and wash with water to obtain amino aerogel.

[0024] Step A2: Take p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate, mix them, heat to 75°C, apply 90rpm stirring to react for 2h, take sodium hydroxide powder, divide it into 6 equal parts, add it intermittently for 30min, keep stirring at constant temperature after complete addition, and control the total addition reaction time of sodium hydroxide to be 8h, wherein the feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:25mmol:15mg:1g:25mL. After the reaction is completed, filter and rotary evaporate, wash the substrate with water and vacuum dry to obtain a modifier.

[0025] Step A3: pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the aminated aerogel and ultrasonically disperse for 15 minutes, introduce nitrogen protection, pre-heat to 55°C, stir at 150rpm for 1 hour, and then continue to heat to 130°C and reflux for 20 minutes, wherein the feed ratio of the aminated aerogel, the modifier, triethylamine and dimethylacetamide is 50g:2.5g:8mL:70mL. After the reaction is completed, cool and filter, and the substrate is vacuum dried to obtain a modified aerogel filler.

[0026] (2) Preparation of high temperature resistant nylon composite materials

[0027] Step S1: taking raw materials according to weight parts, 100 parts of nylon 66 resin, Zytel 101L type resin raw material is selected; 13 parts of modified aerogel filler, which is self-made in this embodiment; 1.6 parts of lubricant, which is compounded by GM-100Y type silicone powder and ZF11-2 type polytetrafluoroethylene powder in an equal mass ratio; 0.15 parts of antioxidant, which is compounded by antioxidant 1790 and antioxidant 412S in a weight ratio of 2:1; 0.3 parts of light stabilizer, selected from Chiguard 5431 type raw material.

[0028] Step S2: adding nylon 66 resin, lubricant, antioxidant and light stabilizer into a high-speed mixer according to a proportion, mixing at a high speed of 1200 rpm for 10 minutes, adding the mixture from the main feeding port of the twin-screw extruder, adding the modified aerogel filler from the side feeding port, and melt-extruding and compounding, wherein the barrel temperature zones during the melt extrusion process are set as follows: 260°C for zone one, 280°C for zone two, 280°C for zone three, 300°C for zone four, 300°C for zone five, 290°C for zone seven, 280°C for zone eight, and 270°C for the die head, and cooling and granulating the discharged material to obtain a high temperature resistant nylon composite material.

[0029] Example 2, preparing a high temperature resistant nylon composite material, specifically as follows:

[0030] (1) Preparation of modified aerogel fillers

[0031] Step A1: prepare a 50% volume fraction ethanol aqueous solution, premix the silane coupling agent KH-550 and the ethanol aqueous solution, add hydrochloric acid for acidification, control the pH value to 3, apply 90rpm stirring for hydrolysis for 50min, add aerogel powder and ultrasonically disperse it at 28kHz for 3min, then switch to 60rpm stirring for coupling for 5h, wherein the aerogel powder is selected from a silica aerogel powder with a fineness of 200 mesh, and the feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:2.2g:100mL. After the reaction is completed, filter and wash with water to obtain amino aerogel.

[0032] Step A2: Take p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate, mix them, heat to 65°C, apply 60rpm stirring to react for 3h, take sodium hydroxide powder, divide it into 6 equal parts, add it intermittently for 40min, keep stirring at constant temperature after complete addition, and control the total addition reaction time of sodium hydroxide to be 10h, wherein the feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:22mmol:10mg:0.8g:20mL. After the reaction is completed, filter and rotary evaporate, wash the substrate with water and vacuum dry to obtain a modifier.

[0033] Step A3: Pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the aminated aerogel and ultrasonically disperse for 20 minutes, introduce nitrogen protection, pre-heat to 40°C, stir at 120rpm for reaction for 1.5 hours, and then continue to heat to 110°C and reflux for 30 minutes, wherein the feed ratio of the aminated aerogel, the modifier, triethylamine and dimethylacetamide is 50g:3.3g:12mL:60mL. After the reaction is completed, cool and filter, and the substrate is vacuum dried to obtain a modified aerogel filler.

[0034] (2) Preparation of high temperature resistant nylon composite materials

[0035] Step S1: taking raw materials according to weight parts, 100 parts of nylon 66 resin, Zytel 101L type resin raw material is selected; 18 parts of modified aerogel filler, which is self-made in this embodiment; 2.2 parts of lubricant, which is compounded by GM-100Y type silicone powder and ZF11-2 type polytetrafluoroethylene powder in an equal mass ratio; 0.12 parts of antioxidant, which is compounded by antioxidant 1790 and antioxidant 412S in a weight ratio of 2:1; 0.2 parts of light stabilizer, selected from Chiguard 5431 type raw material.

[0036] Step S2: adding nylon 66 resin, lubricant, antioxidant and light stabilizer into a high-speed mixer according to a proportion, mixing at a high speed of 1200 rpm for 10 minutes, adding the mixture from the main feeding port of the twin-screw extruder, adding the modified aerogel filler from the side feeding port, and melt-extruding and compounding, wherein the barrel temperature zones during the melt extrusion process are set to: 240°C for zone 1, 260°C for zone 2, 270°C for zone 3, 290°C for zone 4, 290°C for zone 5, 280°C for zone 7, 270°C for zone 8, and 260°C for the die head, and cooling and granulating the discharged material to obtain a high temperature resistant nylon composite material.

[0037] Example 3, preparing a high temperature resistant nylon composite material, specifically as follows:

[0038] (1) Preparation of modified aerogel fillers

[0039] Step A1: prepare a 40% volume fraction of ethanol aqueous solution, premix the silane coupling agent KH-550 and the ethanol aqueous solution, add hydrochloric acid for acidification, control the pH value to 3, apply 120rpm stirring for hydrolysis for 40min, add aerogel powder and ultrasonically disperse it at 28kHz for 3min, then switch to 60rpm stirring for coupling for 4.5h, wherein the aerogel powder is selected from a silica aerogel powder with a fineness of 200 mesh, and the feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:1.9g:90mL. After the reaction is completed, filter and wash with water to obtain amino aerogel.

[0040] Step A2: Take p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate, mix them, heat to 70°C, apply 90rpm stirring to react for 2.5h, take sodium hydroxide powder, divide it into 6 equal parts, add it intermittently for 30min, keep stirring at constant temperature after complete addition, and control the total addition reaction time of sodium hydroxide to be 9h, wherein the feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:23mmol:12mg:0.9g:25mL. After the reaction is completed, filter and rotary evaporate, wash the substrate with water and vacuum dry to obtain a modifier.

[0041] Step A3: Pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the aminated aerogel and ultrasonically disperse for 20 minutes, introduce nitrogen protection, pre-heat to 50°C, stir at 150rpm for reaction for 1.2 hours, and then continue to heat to 120°C and reflux for 25 minutes, wherein the feed ratio of the aminated aerogel, the modifier, triethylamine and dimethylacetamide is 50g:2.8g:10mL:60mL. After the reaction is completed, cool and filter, and the substrate is vacuum dried to obtain a modified aerogel filler.

[0042] (2) Preparation of high temperature resistant nylon composite materials

[0043] Step S1: taking raw materials according to weight parts, 100 parts of nylon 66 resin, Zytel 101L type resin raw material is selected; 15 parts of modified aerogel filler, which is homemade in this embodiment; 1.8 parts of lubricant, which is compounded by GM-100Y type silicone powder and ZF11-2 type polytetrafluoroethylene powder in an equal mass ratio; 0.13 parts of antioxidant, which is compounded by antioxidant 1790 and antioxidant 412S in a weight ratio of 2:1; 0.2 parts of light stabilizer, selected from Chiguard 5431 type raw material.

[0044] Step S2: adding nylon 66 resin, lubricant, antioxidant and light stabilizer into a high-speed mixer according to a proportion, mixing at a high speed of 1200 rpm for 10 minutes, adding the mixture from the main feeding port of the twin-screw extruder, adding the modified aerogel filler from the side feeding port, and melt-extruding and compounding, wherein the barrel temperature zones during the melt extrusion process are set to: 250°C for zone 1, 280°C for zone 2, 280°C for zone 3, 290°C for zone 4, 300°C for zone 5, 290°C for zone 7, 270°C for zone 8, and 260°C for the die head, and cooling and granulating the discharged material to obtain a high temperature resistant nylon composite material.

[0045] Example 4, preparation of high temperature resistant nylon composite material, specifically as follows:

[0046] (1) Preparation of modified aerogel fillers

[0047] Step A1: prepare an ethanol aqueous solution with a volume fraction of 50%, premix the silane coupling agent KH-550 and the ethanol aqueous solution, add hydrochloric acid for acidification, control the pH value to 3, apply 120rpm stirring for hydrolysis for 50min, add aerogel powder and ultrasonically disperse it at 28kHz for 5min, then switch to 60rpm stirring for coupling for 4-5h, wherein the aerogel powder is selected from a silica aerogel powder with a fineness of 180 mesh, and the feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:2g:100mL. After the reaction is completed, filter and wash with water to obtain amino aerogel.

[0048] Step A2: Take p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate, mix them, heat to 70°C, apply 90rpm stirring to react for 2.8h, take sodium hydroxide powder, divide it into 6 equal parts, add it intermittently for 40min, keep stirring at constant temperature after complete addition, and control the total addition reaction time of sodium hydroxide to be 9h, wherein the feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:25mmol:12mg:0.9g:25mL. After the reaction is completed, filter and rotary evaporate, wash the substrate with water and vacuum dry to obtain a modifier.

[0049] Step A3: Pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the aminated aerogel and ultrasonically disperse for 20 minutes, introduce nitrogen protection, pre-heat to 50°C, stir at 150rpm for reaction for 1.5 hours, and then continue to heat to 120°C and reflux for 20 minutes, wherein the feed ratio of the aminated aerogel, the modifier, triethylamine and dimethylacetamide is 50g:3.1g:12mL:70mL. After the reaction is completed, cool and filter, and the substrate is vacuum dried to obtain a modified aerogel filler.

[0050] (2) Preparation of high temperature resistant nylon composite materials

[0051] Step S1: taking raw materials according to weight parts, 100 parts of nylon 66 resin, Zytel 101L type resin raw material is selected; 16 parts of modified aerogel filler, which is homemade in this embodiment; 2 parts of lubricant, which is compounded by GM-100Y type silicone powder and ZF11-2 type polytetrafluoroethylene powder in an equal mass ratio; 0.13 parts of antioxidant, which is compounded by antioxidant 1790 and antioxidant 412S in a weight ratio of 2:1; 0.2 parts of light stabilizer, selected from Chiguard 5431 type raw material.

[0052] Step S2: adding nylon 66 resin, lubricant, antioxidant and light stabilizer into a high-speed mixer according to a proportion, mixing at a high speed of 1200 rpm for 10 minutes, adding the mixture from the main feeding port of the twin-screw extruder, adding the modified aerogel filler from the side feeding port, and melt-extruding and compounding, wherein the barrel temperature zones during the melt extrusion process are set as: 250°C for zone 1, 270°C for zone 2, 280°C for zone 3, 300°C for zone 4, 300°C for zone 5, 290°C for zone 7, 280°C for zone 8, and 260°C for the die head, and cooling and granulating the discharged material to obtain a high temperature resistant nylon composite material.

[0053] Comparative Example 1: This comparative example refers to Example 4, except that the modified aerogel filler is replaced with an equal amount of amino-modified aerogel, and the rest of the implementation process is exactly the same.

[0054] Comparative Example 2: In this comparative example, 0.3 parts of BRUGGOLEN P22 nucleating agent is added to the comparative example 1, and the mixture is blended with nylon 66 resin. The rest of the implementation process is exactly the same.

[0055] Take the above composite material, mold it into a sheet at a temperature of 280°C and a pressure of 8MPa, and take samples from the prepared sheet to conduct the following tests:

[0056] Tensile test: refer to GB / T 1040.2-2022 standard, the tensile rate is 50mm / min; stress creep test: the temperature is 150℃, the stress is 10MPa, and the test cycles are 24h, 36h and 48h respectively; the specific test results are shown in Table 1:

[0057] Table 1

[0058]

[0059] It can be seen from the test results in Table 1 that the composite material prepared in the embodiment maintains a relatively high mechanical strength, the introduction of the modified aerogel filler has a certain strengthening effect, the stress creep at 150°C is much lower than that of the comparative example, and it has excellent high temperature stress creep resistance, and can effectively maintain the structural stability of the product at high temperature.

[0060] Samples were taken from the above composite materials and the following tests were performed:

[0061] DSC test: The sample was heated to 290°C to eliminate the thermal history, then cooled to room temperature, and then heated to 300°C again. The heating and cooling rates were both 10°C / min, and the crystallinity of the composite material was measured.

[0062] WAXD test: The sample was heated to 290°C to eliminate the thermal history, then cooled to room temperature, and then heated to 200°C for isothermal crystallization. The heating and cooling rates were both 10°C / min, the test scanning rate was 5° / min, the scanning angle was 5-60°, and the Brill temperature of the composite material was measured. The specific test results are shown in Table 2:

[0063] Table 2

[0064]

[0065] It can be seen from the test results in Table 2 that both the embodiment and comparative example 2 have a high degree of crystallinity, and the Brill transition temperature of the embodiment reaches above 180° C., having higher heat resistance stability.

[0066] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A high temperature resistant nylon composite material, characterized in that: The composition comprises, by weight: 100 parts of nylon 66 resin, 13-18 parts of modified aerogel filler, 1.6-2.2 parts of lubricant, 0.12-0.15 parts of antioxidant and 0.2-0.3 parts of light stabilizer; The modified aerogel filler is prepared by the following method: Step A1: premix the silane coupling agent KH-550 and ethanol aqueous solution, acidify with hydrochloric acid to a pH value of 3-4 and stir for hydrolysis for 30-50 minutes, add aerogel powder for ultrasonic dispersion, and then stir for coupling for 4-5 hours. After the reaction is completed, filter, wash and dry to obtain amino aerogel; Step A2: p-Hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide and ethyl acetate are mixed, heated to 65-75° C., stirred and reacted for 2-3 hours, and then sodium hydroxide is added intermittently to continue the reaction for 8-10 hours. After the reaction is completed, the mixture is filtered and rotary evaporated, the substrate is washed with water and vacuum dried to obtain a modifier; Step A3: pre-mix and disperse the modifier, triethylamine and dimethylacetamide, add the amino aerogel and ultrasonically disperse it, introduce nitrogen protection, pre-heat to 40-55°C and stir to react for 1-1.5h, then continue to heat to 110-130°C and reflux for 20-30min, cool and filter after the reaction, and vacuum dry the substrate to obtain a modified aerogel filler.

2. A high temperature resistant nylon composite material according to claim 1, characterized in that: The fineness of the aerogel powder is 150-200 mesh.

3. A high temperature resistant nylon composite material according to claim 2, characterized in that: The feed ratio of aerogel powder, silane coupling agent KH-550 and ethanol aqueous solution is 50g:1.7-2.2g:80-100mL.

4. The high temperature resistant nylon composite material according to claim 1, characterized in that: The feed ratio of p-hydroxydiphenyl ether, epichlorohydrin, tetrabutylammonium bromide, sodium hydroxide and ethyl acetate is 10mmol:22-25mmol:10-15mg:0.8-1g:20-25mL.

5. A high temperature resistant nylon composite material according to any one of claims 1 to 4, characterized in that: The feed ratio of the amination aerogel, the modifier, the triethylamine and the dimethylacetamide is 50 g: 2.5-3.3 g: 8-12 mL: 60-70 mL.

6. The method for preparing a high temperature resistant nylon composite material according to claim 1, characterized in that: Specifically, nylon 66 resin, lubricant, antioxidant and light stabilizer are mixed, the mixture is melt-extruded and modified aerogel filler is added from a side feeding port for compounding, the discharged material is cooled and granulated to obtain a high temperature resistant nylon composite material.

7. The method for preparing a high temperature resistant nylon composite material according to claim 6, characterized in that: The lubricant is compounded from silicone powder and polytetrafluoroethylene powder.

8. The method for preparing a high temperature resistant nylon composite material according to claim 6, characterized in that: During the melt extrusion process, the barrel temperature zones are set as: zone one 240-260°C, zone two 260-280°C, zone three 270-280°C, zone four 290-300°C, zone five 290-300°C, zone seven 280-290°C, zone eight 270-280°C, and die head 260-270°C.

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