High performance high temperature resistant polyamide composition and process for its preparation

Abstract

The application discloses a kind of high-performance high-temperature-resistant polyamide compositions and its preparation method and application, by following by weight parts of raw material composition: high-temperature-resistant polyamide resin: 21-84.99%;Hyperbranched aromatic-aliphatic copolymer polyamide: 5-20%;Reinforcing body: 10-50%;Crosslinking agent: 0.01-5%;Antioxidant: 0-1%;Processing aid: 0-2%;Color masterbatch: 0-1%. Crosslinking agent in formula design can realize the crosslinking of high-temperature-resistant polyamide resin and hyperbranched aromatic-aliphatic copolymer polyamide by chemical bond in impregnation process, avoid the influence of hyperbranched aromatic-aliphatic copolymer polyamide on high-temperature-resistant polyamide composition heat distortion temperature (HDT) performance.The high-performance high-temperature-resistant polyamide composition prepared by the application has excellent mechanical properties, thermal properties, is the first material of "plastic instead of steel", and can be applied in automobile, smart home, photovoltaic and other fields.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high molecular materials, in particular to a high-performance high-temperature-resistant polyamide composition and a preparation method and application thereof. BACKGROUND

[0002] Polyamide (PA) is a thermoplastic resin containing repeating amide groups -- [NHCO] -- in the molecular backbone, which is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields, and is the most widely used engineering plastic. High-temperature-resistant polyamide has high melting point, heat distortion temperature and glass transition temperature, long-term use temperature above 150℃, short-term use temperature above 250℃, and has high modulus, high hardness, high cost performance, low water absorption, dimensional stability, good weldability and fatigue resistance, creep and other advantages.

[0003] Glass fiber is an inorganic non-metallic fiber with high tensile strength, high elastic coefficient, good chemical resistance and low water absorption. It is usually used as a reinforcing body for thermoplastic resin to improve its performance. Thermoplastic resin glass fiber can be divided into chopped glass fiber, continuous glass fiber and long glass fiber according to its form. Long glass fiber reinforced thermoplastic plastic has long retention length of resin, high strength, high impact resistance and excellent fatigue and creep performance, and is the first material for "plastic instead of steel".

[0004] US-20230257579-A1 relates to a polyamide molding compound consisting of a resin mixture, a fiber reinforcement and a metal borate, the prepared fiber-reinforced polyamide molding compound and the molded parts produced therefrom have low warpage, high rigidity and excellent surface quality, and can achieve high fiber filling amount. European patent EP2060607 relates to a long glass fiber prepared polyamide composition, flat glass fibers are selected as the reinforcing agent, the tensile strength, notched impact strength and other properties of the flat glass fiber reinforced polyamide composition in the vertical flow direction are better than those of the cylindrical glass fiber reinforced polyamide composition. US20200147843AL relates to a long glass fiber filled polymer material prepared foaming part, the characteristic is that the long glass fiber retention length of the foaming part is not less than the long glass fiber retention length after the long glass fiber of the foaming part without pressure is formed, which ensures the performance of the part. Chinese patent CN114350145A discloses a cross-linked structure long glass fiber reinforced multi-component copolymerization bio-based high temperature polyamide composition and its preparation method and application. In the preparation process of the long glass fiber reinforced bio-based high temperature polyamide composition, the impregnation mold designed according to the material properties provides better impregnation effect for the polyamide composition. Through the combination of cross-linking agent and irradiation post-treatment process in the design of the modified formula, a "network" cross-linked structure is formed after the injection molding part is formed, which gives the injection molding part better mechanical properties, temperature resistance and flame retardant properties. The prepared long glass fiber reinforced bio-based high temperature polyamide composition can be applied to new energy automobile power battery shell and other parts. Chinese patent CN108795032A discloses a long glass fiber reinforced polyamide 5X composition with high fluidity and its preparation method, which solves the technical problems of viscosity rise caused by the reaction between polyamide resin and polyamide oligomer, the reaction between polyamide and additives, and the polymerization reaction of oligomer under the temperature and pressure conditions of subsequent long glass fiber, resulting in the decrease of fluidity. Chinese patent CN112724663A discloses a high-rigidity, low-fiber-floating long glass fiber reinforced polyamide / polypropylene alloy material and its preparation method. The characteristic of the formula design is to introduce high-fluidity, high-crystallinity homopolymer polypropylene into the formula system of long glass fiber reinforced polyamide. Compared with long glass fiber reinforced polyamide material, this alloy material not only reduces the material cost, but also has obvious improvement in appearance, and the mechanical properties can also be maintained at a high level. Combined with the high heat resistance and high rigidity of polyamide material, it has wide industrial application value in the fields of automobile engine and its surrounding parts, shell exposed parts, etc. The current published patents have certain research on long glass fiber reinforced polyamide, but because the melting temperature of high temperature resistant polyamide is high and the processing window is narrow, there is less research on the preparation of long glass fiber reinforced high temperature resistant polyamide by melt impregnation method, especially the lack of multi-dimensional research on long fiber reinforced high temperature resistant polyamide composition through formula design, processing technology and impregnation mold cavity design. SUMMARY

[0005] To fill the gap in the prior art, the present application provides a high-performance high-temperature-resistant polyamide composition and its preparation method and application, a high-performance high-temperature-resistant polyamide composition is prepared through formula design, processing technology and impregnation cavity design, and the high-performance high-temperature-resistant polyamide composition prepared by the method can be applied to new energy vehicles, smart home, photovoltaic and other fields.

[0006] The present application is realized by the following technical solutions:

[0007] A high-performance high-temperature-resistant polyamide composition, according to the following raw material composition by weight fraction:

[0008]

[0009]

[0010] The high-temperature-resistant polyamide resin can be one or more of PA46, PA4T, PA5T / X, PA6T / X, PA9T, PA10T, PA10T / X, PA12T, PA12T / X, etc., the melting point (Tm) is 270-320℃, the relative viscosity is 1.8-2.7 (test standard: FZT51004-2011), and the end amino group content is ≥80mmol / kg.

[0011] The hyperbranched aromatic-aliphatic copolyamide has a melting point (Tm) of 100-270℃ and an end amino group content of ≥80mmol / kg.

[0012] The reinforcing agent can be one or more of glass fiber, carbon fiber, basalt fiber, etc.

[0013] The present application preferably uses glass fiber: alkali content <0.8%, roving line density 3600±180tex, single filament fiber diameter: 21±1μm, moisture content ≤0.2%, tensile strength ≥0.30N / Tex.

[0014] The crosslinking agent is a long-chain alkene-maleic anhydride copolymer, wherein the maleic anhydride content is 15-25%, and the general structure is as follows:

[0015]

[0016] Wherein n is 8-16.

[0017] The antioxidant is one or more of phosphite antioxidant, hindered phenol antioxidant, halide, metal oxide, wherein the phosphite antioxidant can be tetra(2,4-di-tert-butylphenol)-4,4'-diphenyl diphosphite, CAS: 119345-01-6; tri[2.4-di-tert-butylphenyl] phosphite, CAS No. 31570-04-4; 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphospha-spiro[5.5]undecane, CAS No. 154862-43-8; the hindered phenol antioxidant can be at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, CAS No. 23128-74-7; triethylene glycol ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, CAS No. 36443-68-2; pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], CAS No. 6683-19-8, etc.; halide mixture of cuprous halide and potassium halide; at least one of 4,4'-bis(α,α-dimethylbenzyl) diphenylamine, CAS No. 10081-67-1, etc.

[0018] The hindered phenol antioxidant of the present application is preferably pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the phosphite antioxidant is preferably 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphospha-spiro[5.5]undecane.

[0019] The processing aid is one or more of special functional dendritic additive, saponified calcium montanate, oxidized polyethylene wax, calcium stearate, phenyl silicone, etc.

[0020] The present application preferably uses oxidized polyethylene wax.

[0021] The color master batch is one or more of carbon black, zinc sulfide, iron oxide, etc. according to the color requirement, and the color powder content is 20-99%, and the carrier is PA, PE, POE, EMA or lubricant.

[0022] The high-performance high-temperature-resistant polyamide composition, the preparation method and the application thereof comprise the following steps:

[0023] (1) Various raw materials are weighed according to the formula proportion; the high-temperature-resistant polyamide resin, the crosslinking agent, the antioxidant, the processing aid, the color master batch, etc. are uniformly mixed by a high-speed stirrer, and are prepared for use, and the hyperbranched aromatic-aliphatic copolymer polyamide is weighed and prepared for use.

[0024] (2) The above hyperbranched aromatic-aliphatic copolyamide is input into the impregnation mold cavity through the "melt input port 1", and the high-temperature-resistant polyamide resin and the auxiliary mixed raw materials are input into the impregnation mold cavity through the "melt input port 2", and a high-temperature-resistant polyamide composition is prepared by using a melt impregnation method, and the high-temperature-resistant polyamide composition is obtained after cooling, shaping, granulating and other processes, and the particle length is 8-15 mm.

[0025] The high-performance high-temperature-resistant polyamide composition, the preparation method and the application thereof can be applied to the fields of new energy vehicles, smart homes, photovoltaics and the like.

[0026] The advantages of the application are that the high-performance high-temperature-resistant polyamide composition is innovatively designed by multi-dimensional design of formula design, processing technology and impregnation mold cavity design, and the application requirements in the fields of new energy vehicles, smart homes, photovoltaics and the like are met. The problem of small processing window of the high-temperature-resistant polyamide resin in the preparation of the high-temperature-resistant polyamide composition by the melt impregnation process is solved. The hyperbranched aromatic-aliphatic copolyamide is introduced in the formula design, and the design of the double-melt input port impregnation mold cavity of the upper and lower molds is combined, so that the impregnation of the high-temperature-resistant polyamide on the fiber is realized. The crosslinking agent and the high-temperature-resistant polyamide resin and the hyperbranched aromatic-aliphatic copolyamide jointly act, so that the chemical crosslinking of the two in the processing process is realized. The influence of the introduction of the hyperbranched aromatic-aliphatic copolyamide on the heat distortion temperature and other properties of the high-temperature-resistant polyamide composition is avoided, and excellent performance of the high-temperature-resistant polyamide composition is realized.

[0027] The beneficial effects of the application are:

[0028] 1) The hyperbranched aromatic-aliphatic copolyamide is introduced in the formula design. The aromatic-aliphatic copolyamide has a low melting point, and the impregnation effect of the hyperbranched aromatic-aliphatic copolyamide on the glass fiber is better than that of the high-temperature-resistant polyamide resin. The aromatic structure of the hyperbranched aromatic-aliphatic copolyamide is highly similar to the molecular structure of the high-temperature-resistant polyamide, and can increase the dispersion of the hyperbranched aromatic-aliphatic copolyamide in the high-temperature-resistant polyamide resin. The hyperbranched structure endows the hyperbranched polyamide with a highly branched structure, and the reaction activity of the hyperbranched aromatic-aliphatic copolyamide and the crosslinking agent is increased by limiting the terminal amino groups.

[0029] 2) The patent newly designs a melt impregnation mold cavity, the overall structure includes upper and lower mold cavity main body, semi-circular impregnation rod is installed on the upper and lower mold cavity wall, and the lower mold cavity has two melt input ports. When the upper and lower mold cavities are combined, the glass fiber is spread on the surface of the impregnation rod, thereby completing the melt impregnation process. The lower mold cavity has two melt input ports, the fiber enters the mold cavity and is first impregnated by the melt of "melt input port 1", and when the fiber moves to the top of "melt input port 2", it is impregnated by the second melt. In the present application, the fiber surface after passing through "melt input port 1" has been impregnated by the hyperbranched aromatic-aliphatic copolymer polyamide melt, at this time the fiber surface is wrapped with the melt to form a protective layer, so when the viscosity of the high-temperature-resistant polyamide resin mixture is very high, the fiber will not be adhered and sheared to break, and the fiber will sequentially pull out the hyperbranched aromatic-aliphatic copolymer polyamide melt and the high-temperature-resistant polyamide resin mixture melt from the impregnation mold cavity, and the impregnated fiber strip is cooled, shaped and cut. At the same time, by controlling the melt ratio of the two melt input ports, fiber reinforced materials with different resin contents can be easily obtained. The mold cavity of the present application innovatively uses two melt input ports, and the fiber can be impregnated with high-melting-point resin or high-viscosity resin, thereby obtaining fiber reinforced materials that cannot be obtained by conventional impregnation mold cavities.

[0030] 3) According to the requirements of formula design on processing technology, the impregnation mold is designed. The mold cavity involved in the present application has the following advantages: 1) Compared with the traditional single-melt input port impregnation mold, the present application uses upper and lower mold cavity double-melt input ports, hyperbranched aromatic-aliphatic copolymer polyamide and high-temperature-resistant polyamide resin realize impregnation of glass fiber through different melt input ports, hyperbranched aromatic-aliphatic impregnates glass fiber, and high-temperature-resistant polyamide realizes coating of the above composition, which is better than the existing mold cavity design impregnation effect.

[0031] 4) The present application uses long-chain olefin-maleic anhydride copolymer as crosslinking agent, the structure of crosslinking agent determines the content and reaction activity of maleic anhydride, according to the difference in reaction activity of hyperbranched aromatic-aliphatic copolymer polyamide and high-temperature-resistant polyamide resin end amino group, the crosslinking agent of the present application is premixed with high-temperature-resistant polyamide resin and reacts with hyperbranched aromatic-aliphatic copolymer polyamide coated on the surface of the fiber when it is above "melt input port 2". The present application limits the structure of long-chain olefin-maleic anhydride copolymer, the content of maleic anhydride in the crosslinking agent is high, and the reaction activity is too strong, which will cause the high crosslinking of high-temperature-resistant polyamide resin, the reaction activity of crosslinking agent is low, the steric hindrance of benzene ring structure of high-temperature-resistant polyamide resin is large, and the effective reaction of the two cannot be realized.

[0032] 5) The present application realizes the chemical crosslinking of high-temperature-resistant polyamide resin and hyperbranched aromatic-aliphatic copolymer polyamide through the joint action of crosslinking agent, which avoids the influence of hyperbranched aromatic-aliphatic copolymer polyamide introduced by formula design on the properties such as heat distortion temperature of high-temperature-resistant polyamide composition.

[0033] 6) The application designs the high-temperature-resistant polyamide composition through multi-dimensional innovative design of formula design, processing technology and impregnation mold cavity design. The prepared high-temperature-resistant polyamide composition meets the application requirements in the fields of new energy vehicles, smart homes, photovoltaics and the like, and expands the application field of the high-temperature-resistant polyamide composition.

[0034] The above beneficial effects achieve the impregnation effect of the high-temperature-resistant polyamide composition, and achieve excellent mechanical properties of the high-temperature-resistant polyamide composition. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Impregnation mold cavity structure schematic diagram;

[0036] Figure 2 Glass fiber in impregnation mold cavity traction schematic diagram.

[0037] 1, upper mold cavity; 2, lower mold cavity; 3, impregnation rod; 4, melt input port one; 5, melt input port two; DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the application more clear, the application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0039] The examples and comparative examples of the application use the following materials, but are not limited to the following materials:

[0040] Polyamide resin PA5T / X, trade name E6300, produced by Shanghai Kaisai;

[0041] Polyamide resin PA6T / X, trade name 1252, produced by Sanli Benno;

[0042] Polyamide resin PA9T, trade name N1000A-M41, produced by kuraray;

[0043] Polyamide resin PA10T, trade name PPA-10T, produced by Nantong Xie Xin Hot Melt Adhesive Co., Ltd.;

[0044] Polyamide resin PA46, trade name TS300, produced by DSM;

[0045] Glass fiber, trade name ER4301H-3600, produced by Chongqing International Composite Material Co., Ltd.;

[0046] Hyperbranched aromatic-aliphatic copolyamide, commercially available;

[0047] Crosslinking agent, long chain alkene-maleic anhydride copolymer, commercially available;

[0048] Processing aid, oxidized polyethylene wax, commercially available;

[0049] Antioxidant 1010, commercially available;

[0050] Antioxidant 9228, commercially available;

[0051] Color masterbatch, product name TA5101, commercially available;

[0052] As shown in Figure 1 and Figure 2 , the impregnation mold cavity includes a matching upper mold cavity and a lower mold cavity, the inner walls of the upper mold cavity and the lower mold cavity are respectively provided with semicircular impregnation rods, and the semicircular impregnation rods are staggered with each other; the lower mold cavity has two melt input ports. When the upper and lower mold cavities are combined, the glass fiber is spread on the surface of the impregnation rod, thereby completing the melt impregnation process. As shown in the figure, the lower mold cavity has two melt input ports, and the fiber is first impregnated by the melt of "melt input port 1" after entering the mold cavity, and is impregnated by the second melt when the fiber passes above "melt input port 2".

[0053] Since the surface of the fiber after passing through "melt input port 1" has been impregnated by the hyperbranched aromatic-aliphatic copolymer polyamide melt, at this time the fiber surface is wrapped with a melt to form a protective layer, so when the viscosity of the high-temperature-resistant polyamide resin mixture is very high, the fiber will not be adhered and sheared to break, and the fiber will sequentially pull out the hyperbranched aromatic-aliphatic copolymer polyamide melt and the high-temperature-resistant polyamide resin mixture melt from the impregnation mold cavity, and the impregnated fiber strand is cooled, shaped and cut.

[0054] Preparation method of examples 1-5 and comparative examples 1-7:

[0055] Preparation method of high-performance high-temperature-resistant polyamide composition

[0056] (1) Weigh various raw materials according to the formula proportion; high-temperature-resistant polyamide resin, crosslinking agent, antioxidant, processing aid, color masterbatch, etc. are mixed uniformly by high-speed mixer, and are ready for use. Hyperbranched aromatic-aliphatic copolymer polyamide is weighed and prepared.

[0057] (2) The above hyperbranched aromatic-aliphatic copolymer polyamide is introduced into the impregnation mold cavity through "melt input port 1", and the high-temperature-resistant polyamide resin and the mixed raw materials of the aid are introduced into the impregnation mold cavity through "melt input port 2". The high-temperature-resistant polyamide composition is prepared by using melt impregnation method, and the high-performance high-temperature-resistant polyamide composition is obtained after cooling, shaping, cutting and other processes, and the particle length is 8-15 mm.

[0058] Preparation of high performance heat resistant polyamide composition test bars:

[0059] The above materials were dried in a forced air drying oven at 120°C for 4h and then injection molded into standard bars at an injection molding temperature of 280-330°C. The prepared mechanical property bars were conditioned in the laboratory standard environment (23°C, 50% RH) for 24h before testing.

[0060] Test methods for each property:

[0061] Tensile properties: according to ISO 527 method, bar size: 170*10*4mm, test speed 5mm / min.

[0062] Flexural properties: according to ISO 178 method, bar size: 80*10*4mm, test speed 2mm / min.

[0063] Notched impact properties: according to ISO 179 method, bar size: 80*10*4mm.

[0064] Heat deflection temperature: according to ISO 75 method, bar size: 80*10*4, test condition: 1.8MPa.

[0065] Table 1: High performance heat resistant polyamide composition composition and properties of examples 1-5 and comparative examples 1-7

[0066]

[0067]

[0068] As can be seen from the results of the examples and comparative examples in Table 1, the design of the impregnation mold cavity with the upper and lower mold cavity double-melt input ports can increase the impregnation effect of the high-temperature-resistant polyamide on the glass fiber and improve the mechanical properties of the high-temperature-resistant polyamide composition. As can be seen from Examples 1-5 and Comparative Examples 3-7, the high-temperature-resistant polyamide composition and the hyperbranched aromatic-aliphatic copolyamide feed material fed through the double-melt input ports can achieve more excellent mechanical properties than the feed material fed through the single-melt input port. This is because the fiber first enters the "melt input port 1" and is impregnated with the hyperbranched aromatic-aliphatic copolyamide melt, and when the fiber moves to the top of the "melt input port 2", it is impregnated with the high-temperature-resistant polyamide composition melt. Since the fiber surface after passing through the "melt input port 1" has been impregnated with the hyperbranched aromatic-aliphatic copolyamide melt, at this time the fiber surface is wrapped with the melt to form a protective layer, so when the viscosity of the high-temperature-resistant polyamide resin mixture is extremely high, the fiber will not be adhered and sheared to break. As can be seen from Example 1 and Comparative Example 1, the addition of a crosslinking agent in the formula design can greatly reduce the performance of the high-performance polyamide composition, especially the heat distortion temperature. This is because the melting temperature of the hyperbranched aromatic-aliphatic copolyamide is lower than that of the high-temperature-resistant polyamide resin, and as a dispersed phase in the high-temperature-resistant polyamide composition, it will reduce the heat distortion temperature of the material. As can be seen from Example 1 and Comparative Example 2, the addition of the hyperbranched aromatic-aliphatic copolyamide in the formula design can increase the impregnation effect and greatly improve the mechanical properties and heat distortion temperature of the high-temperature-resistant polyamide composition. The high-performance high-temperature-resistant polyamide composition prepared by the present application has excellent mechanical properties and thermal properties, and is the first material for "plastic instead of steel", which can be applied in the fields of automobiles, smart home, photovoltaic, etc.

Claims

1. A high-performance high-temperature resistant polyamide composition, characterized in that: The raw materials are composed of the following parts by weight: high-temperature resistant polyamide resin: 21-84.99%; hyperbranched aromatic-aliphatic copolymer polyamide: 5-20%; reinforcement: 10-50%; crosslinking agent: 0.01-5%; antioxidant: 0-1%; processing aid: 0-2%; color masterbatch: 0-1%. The preparation steps are as follows: (1) Weigh out all raw materials according to the formula ratio; mix high temperature resistant polyamide resin, crosslinking agent, antioxidant, processing aid, and color masterbatch evenly with a high speed mixer and set aside; weigh out hyperbranched aromatic-fatty copolymer polyamide and set aside. (2) The above hyperbranched aromatic-fatty copolymer polyamide is introduced into the impregnation mold cavity through the "melt inlet 1" and the high-temperature resistant polyamide resin and additive mixture is introduced into the impregnation mold cavity through the "melt inlet 2". The high-temperature resistant polyamide composition is prepared by melt impregnation method. After cooling, shaping and pelletizing processes, the high-performance high-temperature resistant polyamide composition is obtained with a particle length of 8-15 mm. (3) The overall structure of the melt impregnation mold cavity consists of upper and lower mold cavities. Semi-circular impregnation rods are installed on the walls of the upper and lower mold cavities. The lower mold cavity has two melt inlets. When the upper and lower mold cavities are combined, the glass fiber spreads on the surface of the impregnation rod, thus completing the melt impregnation process. The lower mold cavity has two types of melt inlets. After the fiber enters the mold cavity, it is first impregnated by the melt of "melt inlet 1". When the fiber reaches above "melt inlet 2", it is impregnated by the second type of melt.

2. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The high-temperature resistant polyamide resin is one or more of PA46, PA4T, PA5T / X, PA6T / X, PA9T, PA10T, PA10T / X, PA12T, and PA12T / X, with a melting point (Tm) of 270-320℃, a relative viscosity of 1.8-2.7, a test standard of FZT51004-2011, and a terminal amine content ≥80mmol / kg.

3. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The hyperbranched aromatic-aliphatic copolymer polyamide has a melting point (Tm) of 100-270℃ and a terminal amino content of ≥80mmol / kg.

4. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The reinforcement is one or more of glass fiber, carbon fiber, and basalt fiber; The glass fiber has the following characteristics: alkali content < 0.8%, roving linear density 3600±180tex, single filament fiber diameter: 21±1μm, moisture content ≤ 0.2%, and tensile strength ≥ 0.30N / Tex.

5. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The crosslinking agent is a long-chain olefin-maleic anhydride copolymer, wherein the maleic anhydride content is 15-25%, and its general structural formula is as follows: ； Where n is 8-16.

6. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The antioxidant is one or more of phosphite antioxidants, hindered phenolic antioxidants, halides, and metal oxides, wherein the phosphite antioxidant is selected from tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite; tris[2,4-di-tert-butylphenyl]phosphite; 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane; hindered phenolic antioxidants; The phenolic antioxidant is selected from at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine; triethylene glycol ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate; pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; a mixture of cuprous halide and potassium halide; and at least one of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

7. The high-performance high-temperature resistant polyamide composition according to claim 6, characterized in that: The hindered phenolic antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and the phosphite antioxidant is 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosspiro[5.5]undecane.

8. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The processing aids mentioned are one or more of the following: dendritic additives containing special functional groups, saponified calcium lignite, oxidized polyethylene wax, calcium stearate, and phenyl silicone.

9. The high-performance high-temperature resistant polyamide composition according to claim 7, characterized in that: The processing aid is selected from oxidized polyethylene wax.

10. The high-performance high-temperature resistant polyamide composition according to claim 1, characterized in that: The masterbatch is selected from one or more of carbon black, zinc sulfide, and iron oxide, with a color powder content of 20-99%, and the carrier is PA, PE, POE, EMA or lubricant.

Images