Polyamide composition having high performance and high-temperature resistance and preparation method therefor

Abstract

Disclosed in the present invention are a polyamide composition having high performance and high-temperature resistance, a preparation method therefor, and the use thereof. The polyamide composition consists of the following raw materials in parts by weight: 21-84.99% of polyamide resin having high-temperature resistance, 5-20% of hyperbranched aromatic-aliphatic copolymerized polyamide, 10-50% of a reinforcer, 0.01-5% of a crosslinker, 0-1% of an antioxidant, 0-2% of a processing aid, and 0-1% of a color masterbatch. During an impregnation process, the crosslinker in the formula can realize the crosslinking of the polyamide resin having high-temperature resistance and the hyperbranched aromatic-aliphatic copolymerized polyamide by means of chemical bonds, thereby avoiding the influence of the hyperbranched aromatic-aliphatic copolymerized polyamide on the heat deformation temperature (HDT) of the polyamide composition having high-temperature resistance. Said polyamide composition prepared by the present invention exhibits excellent mechanical properties and thermal properties, is an ideal material for "plastics replacing steel", and can be applied in the fields of automobiles, smart home, photovoltaics, etc.

Description

A high-performance, high-temperature-resistant polyamide composition and preparation method thereof Technical Field

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

[0002] Polyamide (PA) is a generic term for thermoplastic resins containing repeating amide groups ([NHCO]) in their main molecular chain. It is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy, and other fields, and is currently the most widely used engineering plastic. High-temperature-resistant polyamides have high melting points, heat distortion temperatures, and glass transition temperatures. They can operate at temperatures above 150°C for long periods and 250°C or higher for short periods. They offer advantages such as high modulus, high hardness, high cost-effectiveness, low water absorption, dimensional stability, good weldability, and resistance to fatigue and creep.

[0003] Glass fiber is an inorganic non-metallic fiber with the characteristics of high tensile strength, high elastic modulus, good chemical resistance and low water absorption. It is usually used as a reinforcement for thermoplastic resins to improve their performance. Glass fiber for thermoplastic resins can be divided into chopped glass fiber, continuous glass fiber and long glass fiber according to their shape. Long glass fiber reinforced thermoplastic plastics have a long retention length in the resin, high strength, high impact resistance and excellent fatigue creep properties. It is the first material for "replacing steel with plastic".

[0004] U.S. Patent US-20230257579-A1 relates to a polyamide molding compound, which is composed 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 a high fiber filling amount. European Patent EP2060607 relates to a polyamide composition prepared from long glass fibers, in which flat glass fibers are selected as reinforcements. The flat glass fiber reinforced polyamide composition has better tensile strength, notched impact strength and other properties in the direction perpendicular to the flow than the cylindrical glass fiber reinforced polyamide composition. U.S. Patent US20200147843AL relates to a foamed component prepared from a long glass fiber-filled polymer material, which is characterized in that the retained length of the long glass fibers of the foamed component is not less than the retained length of the long glass fibers after molding of a foamed component of similar size without pressurization, thereby ensuring the performance of the component. Chinese patent CN114350145A discloses a cross-linked long glass fiber-reinforced multi-component bio-based high-temperature polyamide composition, its preparation method, and applications. During the preparation process, an impregnation mold designed specifically for the material's properties provides improved impregnation of the polyamide composition. By combining a cross-linking agent in the blending and modification formula with an irradiation post-treatment process, a "network" cross-linked structure is formed after injection molding, imparting superior mechanical properties, heat resistance, and flame retardancy to the injection molded parts. The resulting long glass fiber-reinforced bio-based high-temperature polyamide composition can be used in parts such as battery housings for new energy vehicles. Chinese patent CN108795032A discloses a long glass fiber-reinforced polyamide 5X composition with high fluidity and its preparation method. This solves the technical problems encountered in the prior art of producing long glass fiber-reinforced polyamide compositions, such as increased viscosity caused by the reaction of the polyamide resin with the polyamide oligomer, the reaction of the polyamide with additives, and the subsequent polymerization of the oligomer under the temperature and pressure conditions of the glass fiber, which produces water vapor and gels, leading to decreased fluidity. Chinese patent CN112724663A discloses a high-rigidity, low-floating long glass fiber reinforced polyamide / polypropylene alloy material and its preparation method. The characteristic of the formula design is the introduction of high-fluidity, high-crystallization homopolymer polypropylene into the formula system of long glass fiber reinforced polyamide. Compared with long glass fiber reinforced polyamide materials, this alloy material not only reduces the material cost, but also has a significant improvement in appearance. At the same time, the mechanical properties can also be maintained at a high level. Combined with the high heat resistance and high rigidity characteristics of polyamide materials, it has a wide range of industrial application value in the fields of automobile engines and their peripheral parts, shell exposed parts, etc. The currently disclosed patents have made some research on the use of long glass fibers to reinforce polyamide. However, due to the high melting point and narrow processing window of high-temperature resistant polyamide, there is little research on the preparation of long glass fiber reinforced high-temperature resistant polyamide by melt impregnation, especially the lack of research on multi-dimensional research on long fiber reinforced high-temperature resistant polyamide compositions through formula design, processing technology, and impregnation mold cavity design. Summary of the Invention

[0005] To fill a gap in the existing technology, the present invention provides a high-performance, high-temperature-resistant polyamide composition, its preparation method, and application. Through formulation design, processing technology, and impregnation mold cavity design, the high-performance, high-temperature-resistant polyamide composition is prepared. The high-performance, high-temperature-resistant polyamide composition prepared by this method can be applied in new energy vehicles, smart homes, photovoltaics, and other fields.

[0006] The present invention is achieved through the following technical solutions:

[0007] A high-performance, high-temperature-resistant polyamide composition, comprising the following raw materials in parts by weight:

[0008] 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., with a melting point (Tm) of 270-320°C, a relative viscosity of 1.8-2.7 (test standard: FZT51004-2011), and a terminal amino group content of ≥80 mmol / kg.

[0009] The hyperbranched aromatic-aliphatic copolymer polyamide has a melting point (Tm) of 100-270° C. and a terminal amino group content of ≥80 mmol / kg.

[0010] The reinforcement may be one or more of glass fiber, carbon fiber, basalt fiber and the like.

[0011] The preferred glass fiber of the present invention has: alkali content <0.8%, roving linear density 3600±180tex, single fiber diameter: 21±1μm, moisture content ≤0.2%, and tensile strength ≥0.30N / Tex.

[0012] The crosslinking agent is a long-chain olefin-maleic anhydride copolymer, wherein the maleic anhydride content is 15-25%, and the general structural formula is as follows:

[0013] Where n is 8-16.

[0014] The antioxidant is one or more of a phosphite antioxidant, a hindered phenol antioxidant, a halide, and a metal oxide, wherein the phosphite antioxidant can be tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite, CAS: 119345-01-6; tris[2,4-di-tert-butylphenyl]phosphite, CAS No. 31570-04-4; 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, CAS No. 154862-43-8; the hindered phenol antioxidant can be N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, CAS No. No.23128-74-7; at least one of triethylene glycol ether-bis(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; a mixture of cuprous halide and potassium halide; and at least one of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, CAS No.10081-67-1.

[0015] The hindered phenol antioxidant of the present invention 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-diphosphaspiro[5.5]undecane.

[0016] The processing aid is one or more of a dendritic structure additive containing a special functional group, saponified calcium montanate, oxidized polyethylene wax, calcium stearate, phenyl silicone, and the like.

[0017] The present invention preferentially oxidizes polyethylene wax.

[0018] The masterbatch can be one or more of carbon black, zinc sulfide, iron oxide, etc. according to the color requirements, with a color powder content of 20-99%, and a carrier of PA, PE, POE, EMA or lubricant.

[0019] The high-performance, high-temperature-resistant polyamide composition and its preparation method and application include the following steps:

[0020] (1) Weigh various raw materials according to the formula ratio; high temperature resistant polyamide resin, crosslinking agent, antioxidant, processing aid, masterbatch, etc. are mixed evenly by high-speed blender and set aside; and hyperbranched aromatic-fatty copolymer polyamide is weighed and set aside.

[0021] (2) The hyperbranched aromatic-aliphatic copolymer polyamide is introduced into the impregnation cavity through the melt inlet 1, and the high-temperature resistant polyamide resin and the additive mixed raw material are introduced into the impregnation cavity through the melt inlet 2. The high-temperature resistant polyamide composition is prepared by the melt impregnation method. After cooling, shaping, pelletizing and other processes, the high-performance high-temperature resistant polyamide composition is obtained, and the particle length is 8-15 mm.

[0022] The above-mentioned high-performance, high-temperature-resistant polyamide composition, its preparation method and application can be applied to new energy vehicles, smart homes, photovoltaics and other fields.

[0023] The advantage of the present invention is that it has innovatively designed a high-performance, high-temperature-resistant polyamide composition through multiple dimensions of formula design, processing technology, and impregnation cavity design, meeting the application requirements of new energy vehicles, smart homes, photovoltaics and other fields. It solves the problem that the melting temperature of high-temperature-resistant polyamide resin is high and the processing window for preparing high-temperature-resistant polyamide compositions by melt impregnation process is small. The formula design introduces hyperbranched aromatic-fatty copolymer polyamide combined with the design of the impregnation cavity with double melt input ports of the upper and lower cavities to achieve the impregnation of the fiber with the high-temperature-resistant polyamide, and the cross-linking agent acts together with the high-temperature-resistant polyamide resin and the hyperbranched aromatic-fatty copolymer polyamide to achieve chemical crosslinking of the two during the processing process, avoiding the influence of the hyperbranched aromatic-fatty copolymer polyamide introduced in the formula design on the properties such as the heat deformation temperature of the high-temperature-resistant polyamide composition, and achieving the excellent performance of the high-temperature-resistant polyamide composition.

[0024] The beneficial effects of the present invention are:

[0025] 1) Introducing hyperbranched aromatic-aliphatic copolymer polyamide into the formulation design. Aromatic-aliphatic copolymer polyamide has a low melting point and is more effective at impregnating glass fiber than high-temperature resistant polyamide resins. The aromatic structure of the hyperbranched aromatic-aliphatic copolymer polyamide is highly similar to that of the high-temperature resistant polyamide, which can increase the dispersion of the hyperbranched aromatic-aliphatic copolymer polyamide in the high-temperature resistant polyamide resin. The hyperbranched structure gives the hyperbranched polyamide a highly branched structure. Combined with the restriction of the terminal amino groups, the reactivity of the hyperbranched aromatic-aliphatic copolymer polyamide with the crosslinker is increased.

[0026] 2) This patent newly designs a melt impregnation mold cavity, the overall structure of which includes an upper and lower mold cavity main body. Semicircular impregnation rods are installed on the upper and lower mold cavity walls, and the lower mold cavity has two melt input ports. When the upper and lower mold cavities are merged, the glass fiber unfolds on the surface of the impregnation rod, thereby completing the melt impregnation process. The lower mold cavity has two melt input ports. After the fiber enters the mold cavity, it is first impregnated by the melt of "melt input port 1". When the fiber reaches above "melt input port 2", it is impregnated by the second melt. In the present invention, since the fiber surface after passing through "melt input port 1" has been impregnated with the hyperbranched aromatic-fatty copolymer polyamide melt, the fiber surface is now wrapped with the melt to form a protective layer. Therefore, when the viscosity of the high-temperature resistant polyamide resin mixture is extremely high, the fiber will not adhere to shear and break. The fiber will sequentially pull the hyperbranched aromatic-fatty copolymer polyamide melt and the high-temperature resistant polyamide resin mixture melt out of the impregnation mold cavity at the same time. The impregnated fiber material strips are subsequently cooled, shaped, and pelletized. By controlling the melt ratio of the two melt inlets, fiber-reinforced materials with different resin contents can be easily obtained. The mold cavity of this patent innovatively uses two melt inlets, allowing the fiber to be impregnated with high-melting-point resin or high-viscosity resin, thereby obtaining fiber-reinforced materials that cannot be obtained with conventional impregnation mold cavities.

[0027] 3) Based on the processing requirements of the formulation design, a targeted impregnation mold is designed. The mold cavity involved in the present invention has the following advantages: 1) Compared with the traditional impregnation mold with a single melt input port, the present invention adopts a dual melt input port in the upper and lower mold cavities. The hyperbranched aromatic-fatty copolymer polyamide and the high-temperature resistant polyamide resin are impregnated into the glass fiber through different melt input ports. The hyperbranched aromatic-fatty copolymer impregnates the glass fiber, and the high-temperature resistant polyamide coats the above composition, resulting in a better impregnation effect than the existing mold cavity design.

[0028] 4) The present invention uses a long-chain olefin-maleic anhydride copolymer as a crosslinking agent. The structure of the crosslinking agent determines the content and reactivity of maleic anhydride. Based on the difference in reactivity of the terminal amino groups of the hyperbranched aromatic-aliphatic copolyamide and the high-temperature resistant polyamide resin, the crosslinking agent of the present invention is premixed with the high-temperature resistant polyamide resin above the "melt input port 2" to react with the hyperbranched aromatic-aliphatic copolyamide coated on the fiber surface. The present invention defines the structure of the long-chain olefin-maleic anhydride copolymer. If the maleic anhydride content in the crosslinking agent is high, the reactivity will be too strong, resulting in a high degree of crosslinking of the high-temperature resistant polyamide resin. If the reactivity of the crosslinking agent is low, the benzene ring structure of the high-temperature resistant polyamide resin has a large steric hindrance, and an effective reaction between the two cannot be achieved.

[0029] 5) The present invention realizes chemical crosslinking of the high-temperature resistant polyamide resin and the hyperbranched aromatic-aliphatic copolymer polyamide during the processing process by the crosslinking agent, thereby avoiding the influence of the hyperbranched aromatic-aliphatic copolymer polyamide introduced into the formulation design on the properties such as the heat deformation temperature of the high-temperature resistant polyamide composition.

[0030] 6) This invention innovatively designs a high-temperature-resistant polyamide composition through multiple dimensions, including formulation, processing, and impregnation mold cavity design. The resulting high-temperature-resistant polyamide composition meets the requirements of applications in new energy vehicles, smart homes, photovoltaics, and other fields, expanding its application areas.

[0031] The above beneficial effects achieve the impregnation effect of the high-temperature resistant polyamide composition and the excellent mechanical properties of the high-temperature resistant polyamide composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the impregnation mold cavity structure;

[0033] Figure 2 Schematic diagram of glass fiber pulling in the impregnation mold cavity. 1. Upper mold cavity; 2. Lower mold cavity; 3. Impregnation rod; 4. Melt inlet 1; 5. Melt inlet 2; DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The following materials are used in the examples and comparative examples of the present invention, but are not limited to the following materials:

[0036] Polyamide resin PA5T / X, trade name E6300, produced by Shanghai Cathay;

[0037] Polyamide resin PA6T / X, trade name 1252, produced by Sanlibenuo;

[0038] Polyamide resin PA9T, trade name N1000A-M41, produced by Kuraray;

[0039] Polyamide resin PA10T, trade name PPA-10T, produced by Nantong Xinxin Hot Melt Adhesive Co., Ltd.

[0040] Polyamide resin PA46, trade name TS300, produced by DSM;

[0041] Glass fiber, trade name ER4301H-3600, produced by Chongqing International Composite Materials Co., Ltd.;

[0042] Hyperbranched aromatic-aliphatic copolymer polyamide, commercially available;

[0043] Crosslinking agent, long chain olefin-maleic anhydride copolymer, commercially available;

[0044] Processing aid, oxidized polyethylene wax, commercially available;

[0045] Antioxidant 1010, commercially available;

[0046] Antioxidant 9228, commercially available;

[0047] Masterbatch, trade name TA5101, commercially available;

[0048] As shown in Figures 1 and 2, the impregnation mold cavity comprises a mating upper and lower mold cavities. Semicircular impregnation rods are mounted on the adjacent inner walls of each cavity, interlaced with each other. The lower mold cavity has two melt inlets. When the upper and lower mold cavities merge, the glass fiber spreads on the surfaces of the impregnation rods, completing the melt impregnation process. As shown in the figure, the lower mold cavity has two melt inlets. Upon entering the mold cavity, the fiber is first impregnated with the melt from "Melt Inlet 1." When the fiber reaches above "Melt Inlet 2," it is impregnated with the second melt.

[0049] Because the fiber surface has been impregnated with the hyperbranched aromatic-aliphatic copolymer polyamide melt after passing through "melt inlet 1," the melt forms a protective layer around the fiber surface. Therefore, even when the viscosity of the high-temperature-resistant polyamide resin mixture is extremely high, the fiber will not adhere or shear, and will instead simultaneously pull the hyperbranched aromatic-aliphatic copolymer polyamide melt and the high-temperature-resistant polyamide resin mixture melt out of the impregnation mold cavity. The impregnated fiber strips are then cooled, shaped, and pelletized. By controlling the melt ratio of the two melt inlets, fiber-reinforced materials with varying resin contents can be easily obtained.

[0050] Preparation methods of Examples 1-5 and Comparative Examples 1-7:

[0051] Preparation method of high-performance high-temperature resistant polyamide composition

[0052] (1) Weigh various raw materials according to the formula ratio; high temperature resistant polyamide resin, crosslinking agent, antioxidant, processing aid, masterbatch, etc. are mixed evenly by high-speed blender and set aside; and hyperbranched aromatic-fatty copolymer polyamide is weighed and set aside.

[0053] (2) The hyperbranched aromatic-aliphatic copolymer polyamide is introduced into the impregnation cavity through the melt inlet 1, and the high-temperature resistant polyamide resin and the additive mixed raw material are introduced into the impregnation cavity through the melt inlet 2. The high-temperature resistant polyamide composition is prepared by the melt impregnation method. After cooling, shaping, pelletizing and other processes, the high-performance high-temperature resistant polyamide composition is obtained, and the particle length is 8-15 mm.

[0054] Preparation of high-performance, high-temperature-resistant polyamide composition test specimens:

[0055] The above materials were dried in a forced air drying oven at 120° C. for 4 h and then injection molded into standard specimens at an injection molding temperature of 280-330° C. The prepared mechanical properties specimens were conditioned in a standard laboratory environment (23° C., 50% RH) for 24 h before testing.

[0056] Test methods for various performance indicators:

[0057] Tensile properties: According to ISO 527 method, specimen size: 170*10*4mm, test speed 5mm / min.

[0058] Bending properties: According to ISO 178 method, specimen size: 80*10*4mm, test speed 2mm / min.

[0059] Notched impact performance: According to ISO 179 method, sample size: 80*10*4mm.

[0060] Heat distortion temperature: According to ISO 75 method, sample size: 80*10*4, test condition: 1.8MPa.

[0061] Table 1: Composition and properties of high performance high temperature resistant polyamide compositions of Examples 1-5 and Comparative Examples 1-7

[0062] The results of the Examples and Comparative Examples in Table 1 show that the design of an impregnation mold cavity with dual melt inlets in the upper and lower mold cavities can enhance the impregnation effect of the high-temperature polyamide on the glass fiber, improving the mechanical properties of the high-temperature polyamide composition. Examples 1-5 and Comparative Examples 3-7 show that using dual melt inlets to feed the high-temperature polyamide composition and hyperbranched aromatic-aliphatic copolymer polyamide can achieve superior mechanical properties compared to feeding through a single melt inlet. This is because after entering the mold cavity, the fiber is first impregnated with the hyperbranched aromatic-aliphatic copolymer polyamide melt at "melt inlet 1." When the fiber reaches above "melt inlet 2," it is impregnated with the high-temperature polyamide composition melt. Since the fiber surface has already been impregnated with the hyperbranched aromatic-aliphatic copolymer polyamide melt after passing through "melt inlet 1," the fiber surface is now coated with the melt to form a protective layer. Therefore, even when the viscosity of the high-temperature polyamide resin mixture is extremely high, the fiber will not adhere or shear. As can be seen from Example 1 and Comparative Example 1, not adding a crosslinking agent to the formulation design will significantly reduce the performance of the high-performance polyamide composition, especially the heat distortion temperature. This is because the hyperbranched aromatic-aliphatic copolymer polyamide has a lower melting temperature than the high-temperature resistant polyamide resin, and its use as a dispersed phase in the high-temperature resistant polyamide composition will reduce the heat distortion temperature of the material. As can be seen from Example 1 and Comparative Example 2, adding a hyperbranched aromatic-aliphatic copolymer polyamide to the formulation design can increase the impregnation effect and significantly improve the mechanical properties and heat distortion temperature of the high-temperature resistant polyamide combination. The high-performance, high-temperature resistant polyamide composition prepared by the present invention has excellent mechanical and thermal properties, is the first material for "replacing steel with plastic", and can be applied to the fields of automobiles, smart homes, photovoltaics, etc.

Claims

1. A high-performance, high-temperature-resistant polyamide composition, characterized in that: According to the following raw material composition by weight:

2. A high-performance, high-temperature-resistant polyamide composition according to claim 1, characterized in that: 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., with a melting point (Tm) of 270-320°C, a relative viscosity of 1.8-2.7 (test standard: FZT51004-2011), and a terminal amino group content of ≥80mmol / kg.

3. A 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° C. and a terminal amino group content of ≥80 mmol / kg.

4. A high-performance, high-temperature-resistant polyamide composition according to claim 1, characterized in that: The reinforcement may be one or more of glass fiber, carbon fiber, basalt fiber and the like. The preferred glass fiber of the present invention has an alkali content of less than 0.8%, a coarse yarn density of 3600±180tex, a single fiber diameter of 21±1μm, a moisture content of ≤0.2%, and a tensile strength of ≥0.30N / Tex.

5. A high-performance, high-temperature-resistant polyamide composition and a preparation method and application thereof 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 the general structural formula is as follows: Where n is 8-16.

6. A high-performance, high-temperature-resistant polyamide composition according to claim 1, characterized in that: The antioxidant is one or more of a phosphite antioxidant, a hindered phenol antioxidant, a halide, and a metal oxide, wherein the phosphite antioxidant can be tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite, CAS: 119345-01-6; tris[2.4-di-tert-butylphenyl]phosphite, CAS No. 31570-04-4; 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, CAS No. 154862-43-8; the hindered phenol antioxidant can be: 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.; a mixture of cuprous halide and potassium halide; at least one of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, CAS No.10081-67-1.

7. A high-performance, high-temperature-resistant polyamide composition according to claim 6, characterized in that: The hindered phenol 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-diphosphaspiro[5.5]undecane.

8. The high-performance, high-temperature-resistant polyamide composition according to claim 1, characterized in that: The processing aid is one or more of a dendritic structure additive containing a special functional group, saponified calcium montanate, oxidized polyethylene wax, calcium stearate, and phenyl silicone.

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

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

10. The method for preparing a high-performance, high-temperature-resistant polyamide composition according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Weigh various raw materials according to the formula ratio; high temperature resistant polyamide resin, crosslinking agent, antioxidant, processing aid, masterbatch, etc. are mixed uniformly by a high-speed stirrer and set aside; and hyperbranched aromatic-fatty copolymer polyamide is weighed and set aside; (2) the hyperbranched aromatic-aliphatic copolymer polyamide "melt input port 1" is introduced into the impregnation cavity, and the high temperature resistant polyamide resin and the auxiliary agent mixed raw material are introduced into the impregnation cavity through the "melt input port 2", and the high temperature resistant polyamide composition is prepared by melt impregnation method, and after cooling, shaping, pelletizing and other processes, the high performance high temperature resistant polyamide composition is obtained, and the particle length is 8-15 mm; (3) High-performance, high-temperature-resistant polyamide compositions have high requirements for impregnation and a small processing window. In order to achieve a good impregnation effect, the impregnation mold adopts the following design scheme: The overall structure of the melt impregnation mold cavity designed by the present invention includes an upper and lower mold cavity main body, and a semicircular impregnation rod is installed on the upper and lower mold cavity walls. At the same time, the lower mold cavity has two melt input ports. When the upper and lower mold cavities are merged, the glass fiber unfolds 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. After the fiber enters the mold cavity, it is first impregnated by the melt of "melt input port 1". When the fiber reaches above "melt input port 2", it is impregnated by the second melt.

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