Low-warpage high-toughness hydrolysis-resistant alcoholysis-resistant weather-resistant nylon composite material and preparation method thereof

Abstract

The invention relates to the technical field of nylon composite materials, in particular to a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material and a preparation method thereof.The nylon composite material is prepared from, by weight, 20%-40% of modified glass fibers, 5%-15% of a toughening agent, 0.5%-2% of a weather-resistant agent, 0.5%-2% of a hydrolysis-resistant agent, 0.1%-1% of a processing aid and the balance nylon resin; the modified glass fiber is prepared by coupling a glass fiber through a hydroxyl silane coupling agent or an amino silane coupling agent and then carrying out in-situ polymerization reaction with 4, 4 '-difluorodiphenyl sulfone, dihydroxyl-terminated polyether modified silicone oil, bisphenol fluorene and biphenol; the method has the advantages that the dispersion uniformity of the glass fibers in the nylon matrix and the compatibility of the glass fibers and the matrix are improved.

Description

Technical Field

[0001] This application relates to the technical field of nylon composites, and particularly relates to a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material and a preparation method thereof. Background Art

[0002] Glass fiber reinforced nylon composites are widely used in fields such as automobiles, electronics, and electrical appliances due to their excellent mechanical properties, heat resistance, and processing performance. In recent years, with the development of automotive lightweighting and miniaturization of electronic devices, the comprehensive performance requirements for materials have become increasingly high. However, in traditional glass fiber reinforced nylon composites, as a rigid reinforcement, the interface between glass fiber and nylon matrix is weak, and stress concentration is easily formed under external forces, leading to crack initiation and rapid propagation, resulting in reduced toughness of the material; moreover, the nylon matrix has a high shrinkage rate during cooling, and the shrinkage force of glass fiber is extremely low. The inhibition of the free shrinkage of the nylon matrix by glass fiber causes residual stress inside the material, and warping occurs due to uneven anisotropic shrinkage after cooling. In related technologies, in order to improve the toughness of glass fiber reinforced nylon composites and reduce warping, methods such as pre-infiltrating glass fiber or modifying glass fiber with silane coupling agents are used to improve the dispersion degree of glass fiber and the compatibility between glass fiber and matrix, but the improvement amplitude is limited, especially when the addition amount of glass fiber is above 30%. Therefore, developing a glass fiber reinforced nylon composite material with low warpage and high toughness still faces great challenges. Summary of the Invention

[0003] In order to improve the dispersion uniformity of glass fiber in the nylon matrix and its compatibility with the matrix, this application provides a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material and a preparation method thereof.

[0004] In the first aspect, this application provides a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, adopting the following technical solution: A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which comprises the following raw materials in weight percentage: 20 - 40% of modified glass fiber, 5 - 15% of toughening agent, 0.5 - 2% of weather-resistant agent, 0.5 - 2% of hydrolysis-resistant agent, 0.1 - 1% of processing aid, and the balance is nylon resin; The modified glass fiber is obtained by coupling glass fiber with a hydroxyl silane coupling agent or an amino silane coupling agent, and then through an in-situ polymerization reaction with 4,4'-difluorodiphenyl sulfone, bis-terminal hydroxyl polyether modified silicone oil, bisphenol fluorene, and biphenol.

[0005] By adopting the above technical solution, after the glass fiber is coupled with a hydroxy silane coupling agent or an amino silane coupling agent, its surface is provided with amino groups or hydroxyl groups. Both the amino groups and the hydroxyl groups can undergo nucleophilic substitution reactions with 4,4'-difluorodiphenyl sulfone, thereby initiating in-situ polymerization, rendering the surface of the glass fiber organic, and thus greatly enhancing the compatibility with the nylon system, making the dispersion of the modified glass fiber in the system more uniform. Under the combined action of these two aspects, the glass fiber reinforced nylon composite material has the advantages of low warpage and high toughness; and by introducing polyether modified silicone oil segments into the molecular structure of the polymer generated in-situ, the flexibility of the polyether modified silicone oil can be utilized to reduce the rigidity of the glass fiber, alleviate the risk of brittle fracture of the rigid matrix, and the addition of the polyether modified silicone oil segments can hinder the intermolecular conjugation of the polymer on the surface of the modified glass fiber, reducing the intermolecular viscosity, thereby making the modified glass fiber easier to disperse, and further optimizing the warpage and toughness of the glass fiber reinforced nylon composite material.

[0006] Preferably, the preparation method of the modified glass fiber is as follows: S1. Dissolve 2 - 3.5 g of hydroxy silane coupling agent in an ethanol / water mixed solution with a volume ratio of 1:1, then add 8 - 12 g of glass fiber, and stir and react at 65 - 80 °C for 15 - 24 h to obtain silane coupling agent modified glass fiber; S2. Disperse the obtained silane coupling agent modified glass fiber in a mixed solution of DMF and sulfolane with a volume ratio of 1:1, then add 0.45 - 0.55 mol of 4,4'-difluorodiphenyl sulfone, 0.00015 - 0.0025 mol of double-end hydroxy polyether modified silicone oil, 0.08 - 0.4 mol of bisphenol fluorene, 0.08 - 0.4 mol of biphenyl diol, and 0.6 - 0.8 mol of anhydrous potassium carbonate, add a dehydrating agent, and install a water separator; under a nitrogen atmosphere, react at 155 - 165 °C for 1.5 - 3 h for salt formation reaction, continue to raise the temperature to 200 - 215 °C, stir and react for 9 - 11 h, then filter, wash, and dry to obtain the modified glass fiber.

[0007] By adopting the above technical solution, the surface of the glass fiber modified by the silane coupling agent contains a large number of hydroxyl groups and amino groups, which can react with 4,4'-difluorodiphenyl sulfone through nucleophilic substitution reactions, and then initiate in-situ polymerization reactions, grafting a large number of organic polymers on its surface, reducing the surface polarity of the glass fiber, promoting its uniform dispersion in the matrix, and avoiding warpage caused by local stress concentration; after monomers such as 4,4'-difluorodiphenyl sulfone are polymerized, a rigid cross-linked layer is formed on the surface of the glass fiber, enhancing the dimensional stability and inhibiting the difference in the coefficient of thermal expansion (CTE). At the same time, the double-end hydroxy polyether modified silicone oil can improve the toughness of the glass fiber, and the combined action of these two aspects reduces the anisotropy.

[0008] Preferably, the hydroxy silane coupling agent is 3-[bis(2-hydroxyethyl)amino]propane triethoxysilane.

[0009] By adopting the above technical solution, the double hydrogen bond can provide more reaction sites, enhance the bonding density on the surface of the glass fiber, and the hydroxyethyl chain segment can relieve the interfacial stress and avoid brittle fracture.

[0010] Preferably, the amino silane coupling agent is one or more of aminopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, 3-aminopropyltrimethoxysilane, and anilinomethyltriethoxysilane.

[0011] By adopting the above technical solution, the unreacted amino groups form strong hydrogen bonds or amide bonds with the nylon carboxylic acid groups, which can significantly improve the interfacial shear strength; it can also provide amino active reaction sites for in-situ polymerization; although not explored in the examples of this application, it is theoretically feasible.

[0012] Preferably, the addition amount of the bisphenol fluorene is 0.15 mol, and the addition amount of the biphenol is 0.33 mol.

[0013] By adopting the above technical solution, the molar ratio of bisphenol fluorene to biphenol is optimized to balance the compactness and flexibility of the crosslinked network; the biphenyl structure of the biphenol is a linear straight-chain structure with a smaller molecular spacing, which can make the density of the polymer on the surface of the glass fiber larger, and the symmetry of the biphenyl structure is also higher. Taken together, it can significantly improve its toughness; while the addition of an appropriate amount of bisphenol fluorene can improve the rigidity of the polymer, increase the strength of the glass fiber, and thus improve the tensile strength of the glass fiber-reinforced nylon composite material.

[0014] Preferably, the length of the glass fiber is 3-6 mm, and the diameter is 10-20 μm.

[0015] By adopting the above technical solution, the glass fiber of this specification is most suitable for the system of this application; the longer glass fiber (compared with the short glass fiber) provides a continuous reinforcement path, significantly improving the tensile strength and modulus, inhibiting shrinkage deformation, and avoiding processing fracture or uneven distribution caused by being too long (>6 mm); the thin-diameter glass fiber increases the specific surface area, strengthens the mechanical meshing with the matrix, and improves the interfacial bonding strength. Too thick glass fiber is prone to cause stress concentration, and too thin glass fiber has insufficient strengthening effect.

[0016] Preferably, the toughening agent is maleic anhydride grafted polyolefin elastomer.

[0017] By adopting the above technical solutions, maleic anhydride reacts with the terminal amino groups of nylon to form chemical bond grafting, improving the interfacial compatibility between the elastomer and the matrix; the elastomer domain undergoes shear yielding under impact, and absorbs energy through crazing or shear bands, enhancing the notched impact strength; the polyolefin segments endow the material with certain flexibility in the amorphous region, reducing the overall shrinkage rate difference.

[0018] In a second aspect, the present application provides a method for preparing a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, adopting the following technical solutions: A method for preparing a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which comprises the following steps: S1. Weigh and mix the dried nylon resin, toughening agent, weather-resistant agent, hydrolysis-resistant agent, and processing aid according to the weight ratio, and then mix them evenly to obtain a premix; S3. Add the premix to the main feeding port of a twin-screw extruder, and add the modified glass fiber through the side feeding port. Control the temperature of the twin-screw extruder at 240 - 280 °C and the screw speed at 200 - 500 rmp for melt blending; S4. Cool and pelletize the material extruded from the twin-screw extruder to obtain a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material.

[0019] By adopting the above technical solutions, the melting point of nylon is matched to ensure sufficient melting while avoiding thermal damage to the glass fiber; the overall process of the present application has strong parameter tolerance, and the modified glass fiber can be evenly dispersed in the system without additional dispersion means; and the qualified rate of the prepared product is also high.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the glass fiber is coupled with a hydroxyl silane coupling agent or an amino silane coupling agent, its surface is provided with amino or hydroxyl groups. Both amino and hydroxyl groups can undergo nucleophilic substitution reactions with 4,4'-difluorodiphenyl sulfone, thereby initiating in-situ polymerization to organically modify the glass fiber surface, greatly enhancing the compatibility between the glass fiber and the nylon system, making the dispersion of the modified glass fiber in the system more uniform. Under the combined action of these two aspects, the glass fiber-reinforced nylon composite material has the advantages of low warpage and high toughness; and by introducing polyether-modified silicone oil segments into the polymer molecular structure formed by in-situ polymerization, the flexibility of polyether-modified silicone oil can be utilized to reduce the rigidity of the glass fiber, alleviating the risk of brittle fracture of the rigid matrix. Moreover, the addition of polyether-modified silicone oil segments can hinder the intermolecular conjugation of the polymer on the surface of the modified glass fiber, reducing the intermolecular viscosity, thereby making the modified glass fiber easier to disperse, and further optimizing the warpage and toughness of the glass fiber-reinforced nylon composite material.

[0021] 2. The tensile strength of the glass fiber reinforced nylon composite prepared in this application is between 184 - 218 MPa, the flexural strength is between 236 - 339 MPa, and the notched Izod impact strength is between 21.5 - 22.9 KJ / m 2 ; meanwhile, its warpage can be maintained between 0.3 - 0.8%; this shows that the glass fiber reinforced nylon composite prepared in this application has the advantages of excellent low warpage, high toughness and high strength at the same time. Detailed implementation mode

[0022] The following further elaborates on this application in combination with specific content.

[0023] Raw materials The raw materials used in the examples of this application are all commercially available; among them, the glass fiber is an alkali-free glass fiber with a length of 3 - 6 mm and a diameter of 10 - 20 μm; the double-ended hydroxyl polyether modified silicone oil is purchased from Kayin Chemical, with the brand of Dow Corning and the product number of BY16 - 201. After testing, its average molecular weight is 15,000; the nylon resin is PA66, with a viscosity of 2.4 and the processing grade is injection molding grade, purchased from Yuyao Zhaoyang Plastic Co., Ltd.; the processing aid is zinc stearate, and the toughening agent is maleic anhydride grafted polyolefin elastomer, both purchased from Dongguan Shanyi Plastic Co., Ltd.; the anti-hydrolysis agent is polycarbodiimide anti-hydrolysis agent, with the model of Stabaxol P, purchased from Shanghai Puzhan Industrial Co., Ltd.; the weather resistance agent is a hindered amine light stabilizer, with the model of UV - 622.

[0024] Preparation example Preparation example 1 A modified glass fiber, and its preparation method is as follows: S1. Dissolve 2.5 g of silane coupling agent in 200 g of ethanol / water mixed solution with a volume ratio of 1:1, then add 10 g of glass fiber, and stir and react at 70 °C for 24 h to obtain silane coupling agent modified glass fiber; the silane coupling agent is 3 - [bis(2 - hydroxyethyl)amino]propane triethoxysilane; S2. Disperse the prepared silane coupling agent modified glass fiber in 1000 g of DMF and sulfolane mixed solution with a volume ratio of 1:1, then add 0.5 mol of 4,4'-difluorodiphenyl sulfone, 0.002 mol of double-ended hydroxyl polyether modified silicone oil (added by mass according to its average molecular weight), 0.15 mol of bisphenol fluorene, 0.33 mol of biphenyl diol and 0.7 mol of anhydrous potassium carbonate, then add 150 g of xylene as a dehydrating agent, stir for 30 min, and then install a water separator; under a nitrogen atmosphere, react at 160 °C for 2 h for salt formation reaction. After the xylene is removed from the reaction system, continue to heat up to 210 °C, stir and react for 10 h, then filter, wash, and dry to obtain modified glass fiber.

[0025] Preparation example 2 A modified glass fiber, which is different from Preparation Example 1 in that the addition amount of bisphenol fluorene in S2 is 0.08 mol, and the addition amount of biphenyl diphenol is 0.4 mol, and the remaining steps are the same as those in Preparation Example 1.

[0026] Preparation Example 3 A modified glass fiber, which is different from Preparation Example 1 in that the addition amount of bisphenol fluorene in S2 is 0.4 mol, and the addition amount of biphenyl diphenol is 0.08 mol, and the remaining steps are the same as those in Preparation Example 1. Examples

[0027] Example 1 A low warpage, high toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material, the raw materials and the weight ratios of the raw materials are shown in Table 1, and its preparation method is as follows: S1. Dry the nylon resin at 80 °C for 5 h to remove moisture; S2. Weigh the dried nylon resin, toughening agent, weathering agent, hydrolysis-resistant agent and processing aid according to the weight ratios in Table 1, and then mix them evenly to obtain a premix; S3. Add the premix to the main feeding port of the twin-screw extruder, add the modified glass fiber through the side feeding port, control the temperature of the twin-screw extruder at 260 °C, and the screw speed at 400 rmp for melt blending; among them, the modified glass fiber comes from Preparation Example 1; S4. Cool and pelletize the material extruded from the twin-screw extruder to obtain a low warpage, high toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material.

[0028] Table 1 Raw materials and their dosages (wt%) in Example 1 Nylon resin Make up to 100 Modified glass fiber 20 Toughening agent 10 Weather resistance agent 1 Hydrolysis resistant agent 1 Processing aid 0.5 Example 2 A low warpage, high toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material, which is different from Example 1 in that its modified glass fiber comes from Preparation Example 2, and the remaining steps are the same as those in Example 1.

[0029] Example 3 A low warpage, high toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material, which is different from Example 1 in that its modified glass fiber comes from Preparation Example 3, and the remaining steps are the same as those in Example 1.

[0030] Example 4 A low warpage, high toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material, which is different from Example 1 in that the weight percentage of the added modified glass fiber is 30 wt%, and the remaining steps are the same as those in Example 1.

[0031] Example 5 A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which is different from Example 1 in that the weight percentage of the modified glass fiber added is 40 wt%, and the remaining steps are the same as those in Example 1.

[0032] Comparative example Comparative example 1 A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which is different from Example 1 in that the modified glass fiber is replaced with an equal mass of silane-coupling-agent-modified glass fiber, and the silane-coupling-agent-modified glass fiber is prepared by the S1 step of Preparation Example 1, and the remaining steps are the same as those in Example 1.

[0033] Comparative example 2 A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which is different from Example 1 in that bis(2-hydroxyethyl) ether-modified silicone oil is not added in the preparation method of the modified glass fiber, and the remaining steps are the same as those in Example 1.

[0034] Comparative example 3 A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which is different from Example 1 in that biphenol in the preparation method of the modified glass fiber is replaced with an equimolar amount of bisphenol fluorene, and the remaining steps are the same as those in Example 1.

[0035] Comparative example 4 A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material, which is different from Example 1 in that bisphenol fluorene in the preparation method of the modified glass fiber is replaced with an equimolar amount of biphenol, and the remaining steps are the same as those in Example 1.

[0036] Performance detection test Detection method / Test method Prepare nylon composite materials according to the preparation methods of Examples 1-5 and Comparative Examples 1-4 respectively, and then detect them according to the following detection methods. The detection results are shown in Table 2.

[0037] Tensile strength: Detect according to the detection method in ISO 527; Flexural strength: Detect according to the detection method in ISO 178; Izod notched impact strength: Detect according to the detection method in ISO 178; Warpage test: Test according to the method of GBT 4677.5-1984. The sample size is 10 mm x 5 mm x 1 mm, with the length (10 mm) as the bending edge length. Warpage (%) = warpage height of the sample / bending edge length (10 mm) x 100%.

[0038] Table 2 Detection results of Examples 1-5 and Comparative Examples 1-4 From Examples 1 - 5, Comparative Examples 1 - 4, and the test data in Table 2, it can be seen that the tensile strength of the glass fiber reinforced nylon composite material prepared in this application is between 184 - 218 MPa, the flexural strength is between 236 - 339 MPa, and the Izod notched impact strength is between 21.5 - 22.9 KJ / m 2 ². Meanwhile, its warpage can be maintained between 0.3 - 0.8%; this indicates that the glass fiber reinforced nylon composite material prepared in this application has the advantages of excellent low warpage, high toughness, and high strength.

[0039] In this application, by modifying the glass fiber with a silane coupling agent, not only the compatibility with the system is improved, but also its surface is provided with abundant reactive groups, such as hydroxyl groups. Using in-situ polymerization of the hydroxyl groups, a polymer is formed on its surface, greatly enhancing its compatibility with the system; and the molecular structure of the polymer is designed. In this application, the polymer is polyarylethersulfone, which has excellent strength and toughness. Moreover, a polyether modified silicone oil segment is introduced to further improve the flexibility of the glass fiber, thereby making the integrity of the glass fiber reinforced nylon composite material stronger and significantly reducing the warpage. This can be verified by the test data of Example 1 and Comparative Examples 1 - 4. Combining Examples 2 - 3, the molar ratio of bisphenol fluorene to biphenol is optimized to balance the compactness and flexibility of the crosslinked network; the biphenyl structure of biphenol is a linear straight-chain structure with a relatively small molecular spacing, which can make the density of the polymer on the surface of the glass fiber larger, and the symmetry of the biphenyl structure is also relatively high. Taken together, the toughness can be significantly improved; while the addition of an appropriate amount of bisphenol fluorene can enhance the rigidity of the polymer and improve the strength of the glass fiber, thereby increasing the tensile strength of the glass fiber reinforced nylon composite material.

[0040] On this basis, by increasing the addition amount of the modified glass fiber, it is found that the Izod notched impact strength first increases and then decreases, and the warpage shows a downward trend.

[0041] This specific embodiment is only an explanation of the present invention and does not limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material, characterized in that: It comprises raw materials with the following weight percentages: 20-40% of modified glass fiber, 5-15% of toughening agent, 0.5-2% of weather resistance agent, 0.5-2% of hydrolysis resistance agent, 0.1-1% of processing aid, and the balance is nylon resin; The modified glass fiber is prepared by coupling glass fiber with a hydroxy silane coupling agent or an amino silane coupling agent, and then reacting with 4,4'-difluorodiphenyl sulfone, bis-hydroxy-terminated polyether modified silicone oil, bisphenol fluorene and biphenol through an in-situ polymerization reaction.

2. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material according to claim 1, characterized in that: The preparation method of the modified glass fiber is as follows: S1. Dissolve 2-3.5 g of hydroxy silane coupling agent in an ethanol / water mixed solution with a volume ratio of 1:1, then add 8-12 g of glass fiber, and stir and react at 65-80 °C for 15-24 h to obtain silane coupling agent modified glass fiber; S2. Disperse the obtained silane coupling agent modified glass fiber in a mixed solution of DMF and sulfolane with a volume ratio of 1:1, then add 0.45-0.55 mol of 4,4'-difluorodiphenyl sulfone, 0.00015-0.0025 mol of bis-hydroxy-terminated polyether modified silicone oil, 0.08-0.4 mol of bisphenol fluorene, 0.08-0.4 mol of biphenol and 0.6-0.8 mol of anhydrous potassium carbonate, add a dehydrating agent, and install a water separator; under a nitrogen atmosphere, react at 155-165 °C for 1.5-3 h for a salt-forming reaction, continue to raise the temperature to 200-215 °C, stir and react for 9-11 h, then filter, wash and dry to obtain modified glass fiber.

3. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite according to claim 2, characterized in that: The hydroxy silane coupling agent is 3-[bis(2-hydroxyethyl)amino]propane triethoxysilane.

4. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material according to claim 2, characterized in that: The amino silane coupling agent is one or more of aminopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, 3-aminopropyltrimethoxysilane, anilinomethyltriethoxysilane.

5. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material according to claim 2, characterized in that: The addition amount of bisphenol fluorene is 0.15 mol, and the addition amount of biphenol is 0.33 mol.

6. The low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite material according to claim 1, wherein: The length of the glass fiber is 3-6 mm, and the diameter is 10-20 μm.

7. A low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant, and weather-resistant nylon composite according to claim 1, characterized in that: The toughening agent is maleic anhydride grafted polyolefin elastomer.

8. A method for preparing the low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material according to any one of claims 1-7, characterized in that: It comprises the following steps: S1. Weigh the dried nylon resin, toughening agent, weather resistance agent, hydrolysis resistance agent and processing aid according to the weight ratio, and then mix them evenly to obtain a premix; S3. Add the premix to the main feeding port of a twin-screw extruder, add the modified glass fiber through the side feeding port, control the temperature of the twin-screw extruder at 240-280 °C, and the screw speed at 200-500 rmp for melt blending; S4. Cool and pelletize the material extruded from the twin-screw extruder to obtain a low-warpage, high-toughness, hydrolysis-resistant, alcoholysis-resistant and weather-resistant nylon composite material.

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