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

Abstract

The invention relates to the technical field of high polymer materials, and discloses a low-temperature-resistant nylon composite material and a preparation method thereof. The nylon composite material prepared by the invention is prepared from the following raw materials in parts by weight: 45-55 parts of nylon 6, 15-25 parts of nylon 66, 2-5 parts of a castor oil-based reinforcing agent, 7-10 parts of glass fibers, 5-10 parts of a toughening agent, 0.5-1 part of a dispersing agent, 0.5-2 parts of a lubricating agent, 0.7-1.5 parts of an antioxidant and 1-2 parts of a coupling agent. According to the invention, nylon 6 and nylon 66 are taken as main raw materials, and functional aids such as a flexibilizer and a castor oil-based reinforcing agent are added, so that the low-temperature resistance and impact toughness of the composite material are improved, and the low-temperature brittleness phenomenon is reduced; wherein the toughening agent and the castor oil-based reinforcing agent are used for remarkably improving the low-temperature resistance through a plasticizing-toughening synergistic effect, dynamic-elastic network complementation and other mechanisms.

Description

Technical Field

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

[0002] Nylon (polyamide, PA), as a semi-crystalline engineering plastic, is widely used in fields such as automobiles, electronics, machinery, and aerospace due to its excellent mechanical properties, wear resistance, chemical corrosion resistance, and processing convenience. However, traditional nylons (such as PA6, PA66) are prone to brittle fracture at low temperatures (usually below -20°C), and their notched impact strength decreases significantly, severely limiting their applications in cold regions or extreme working conditions. With the increasing demand for the low-temperature resistance of materials in modern industries (such as low-temperature battery components of new energy vehicles, polar equipment, cold chain equipment, etc.), developing high-performance low-temperature resistant nylon composite materials has become an important research direction in the field of materials science.

[0003] In the prior art, in order to improve the low-temperature resistance of nylon materials, thermoplastic elastomers are usually blended to introduce a flexible phase, and elastomer particles are used to initiate crazes and shear bands to absorb impact energy. However, excessive addition will lead to a decrease in the rigidity of the material, and the interfacial compatibility between the elastomer and the nylon matrix is poor, and phase separation is prone to occur at low temperatures; adding small molecule plasticizers (such as N-butylbenzenesulfonamide) or cold-resistant agents can reduce the glass transition temperature of nylon and improve the chain segment movement ability. However, small molecule plasticizers are prone to migrate and precipitate, resulting in performance deterioration during long-term use and may cause environmental safety problems. Therefore, researchers still need to develop a low-temperature resistant nylon composite material with excellent comprehensive performance to meet the actual application requirements. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a low-temperature resistant nylon composite material and a preparation method thereof.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A low-temperature resistant nylon composite material, comprising the following raw materials in parts by weight: 45 - 55 parts of nylon 6, 15 - 25 parts of nylon 66, 2 - 5 parts of castor oil-based reinforcing agent, 7 - 10 parts of glass fiber, 5 - 10 parts of toughening agent, 0.5 - 1 part of dispersant, 0.5 - 2 parts of lubricant, 0.7 - 1.5 parts of antioxidant, and 1 - 2 parts of coupling agent;

[0007] Further, the toughening agent is maleic anhydride grafted POE, the dispersant is silicone powder, the lubricant is oleic acid amide, the antioxidant is one of antioxidant 1010 or antioxidant 1076, and the coupling agent is one of silane coupling agents KH550, KH560, or KH570;

[0008] The castor oil-based enhancer is prepared by the following steps:

[0009] Step A1: Under nitrogen conditions, isophorone diisocyanate and dibutyltin dilaurate are mixed and stirred evenly in N,N-dimethylformamide, castor oil is added, and the mixture is heated to 60-70 °C, stirred and reacted for 2-3 h, and then distilled under reduced pressure to obtain isocyanate-based castor oil;

[0010] Further, in step A1, the dosage ratio of isophorone diisocyanate, dibutyltin dilaurate, castor oil and N,N-dimethylformamide is 0.15-0.153 mol: 3-4 mL: 0.05 mol: 200 mL;

[0011] Step A2: The isocyanate-based castor oil and dibutyltin dilaurate are stirred evenly in toluene, then 1,5-pentanediamine hydrochloride is added, the mixture is heated to 70 °C, and reacted for 1.5-2.5 h under nitrogen conditions, rotary evaporated and dried to obtain amino-terminated castor oil;

[0012] Further, in step A2, the dosage ratio of isocyanate-based castor oil, 1,5-pentanediamine hydrochloride, dibutyltin dilaurate and toluene is 0.01 mol: 0.03-0.032 mol: 0.5-1 mL: 100 mL;

[0013] Step A3: Polyethylene glycol monomethyl ether glycidyl ether (number average molecular weight of 1000) and mercaptoethylamine are mixed evenly in ethanol, stirred and refluxed for 12 h, n-hexane is added and stirred for 10 min, allowed to stand, the lower layer product is collected, and rotary evaporated to obtain mercapto-functionalized polyethylene glycol derivative;

[0014] Further, in step A3, the dosage ratio of polyethylene glycol monomethyl ether glycidyl ether, mercaptoethylamine, ethanol and n-hexane is 0.1 mol: 0.1 mol: 100 mL: 300 mL;

[0015] Step A4: The amino-terminated castor oil, mercapto-functionalized polyethylene glycol derivative and photoinitiator 1173 are mixed and stirred evenly, transferred to under an ultraviolet lamp and irradiated for 2.5-3.5 h, ethyl acetate is added and stirred for 5 min, washed, dried, filtered, and rotary evaporated to obtain the castor oil-based enhancer;

[0016] Further, in step A4, the molar ratio of carbon-carbon double bonds in amino-terminated castor oil to mercapto groups in mercapto-functionalized polyethylene glycol derivative is 1-2: 1;

[0017] Further, in step A4, the photoinitiator 1173 is 1.5 wt%-2 wt% of the total amount of reactants, and ethyl acetate is 10 wt%-20 wt% of the total amount of reactants.

[0018] A preparation method of a low-temperature resistant nylon composite material comprises the following steps:

[0019] Weigh raw materials by weight parts. After drying nylon 6 and nylon 66, add castor oil-based reinforcing agent, glass fiber, toughening agent, dispersant, lubricant, antioxidant and coupling agent, mix and stir evenly, and then transfer to a twin-screw extruder for plasticization, extrusion and pelletizing to obtain the low-temperature resistant nylon composite material;

[0020] Furthermore, the screw temperature of the twin-screw extruder is 260 - 280 °C, and the screw speed is 150 - 250 r / min.

[0021] Advantages of the present invention:

[0022] The nylon composite material prepared by the present invention uses nylon 6 and nylon 66 as the main raw materials, and adds functional additives such as toughening agent and castor oil-based reinforcing agent, which improves the low-temperature resistance and impact toughness of the composite material and reduces the generation of low-temperature brittleness phenomenon; among them, the toughening agent and castor oil-based reinforcing agent significantly improve the low-temperature resistance through mechanisms such as plasticization-toughening synergy and dynamic-elastic network complementarity.

[0023] The castor oil-based reinforcing agent is introduced into the nylon composite material prepared by the present invention, which can significantly improve the low-temperature resistance of the composite material and is not easy to migrate and precipitate in the matrix; this is because the polyether chain segment in the castor oil-based reinforcing agent has excellent flexibility, and can increase the movement ability of the molecular chain after being introduced into the matrix, thereby reducing low-temperature brittleness; the long-chain fatty acid structure of castor oil itself can also act as an internal lubricant, reducing the frictional resistance between nylon molecular chains, improving the deformation ability at low temperature, and inhibiting crack propagation; the carbamate and urea bonds have strongly polar N-H groups, which can form a hydrogen bond network with the amide groups in the nylon molecular chain. This hydrogen bond interaction can enhance the interfacial adhesion between the castor oil-based reinforcing agent and the nylon matrix, enable the stress to be evenly distributed at low temperature, avoid brittle fracture caused by local stress concentration, and at the same time, the dynamic hydrogen bond network formed by urea bonds and carbamate absorbs energy through reversible fracture during low-temperature deformation, thereby reducing brittleness; the polyether chain segment and the long-chain fatty acid structure can also be embedded in the neatly arranged nylon molecular chain structure, weakening the intermolecular force, increasing the mobility of the molecular chain, and then reducing the crystallinity of the molecular chain segment, and the reduction of crystallinity can reduce the brittleness of the material at low temperature. In addition, the dynamic hydrogen bond network (short-term energy dissipation) formed by urea bonds and carbamate is complementary to the elastomer network of the toughening agent (long-term deformation recovery), enabling the material to quickly dissipate energy after low-temperature impact and maintain structural integrity. Specific embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Example 1: The castor oil-based enhancer is prepared by the following steps:

[0026] Step A1: Under nitrogen conditions, isophorone diisocyanate and dibutyltin dilaurate are mixed and stirred evenly in N,N-dimethylformamide, castor oil is added, and the mixture is heated to 60 °C and stirred for reaction for 2 h, followed by vacuum distillation to obtain isocyanate-based castor oil. The dosage ratios of isophorone diisocyanate, dibutyltin dilaurate, castor oil, and N,N-dimethylformamide are 0.15 mol: 3 mL: 0.05 mol: 200 mL;

[0027] Step A2: The isocyanate-based castor oil and dibutyltin dilaurate are stirred evenly in toluene, then 1,5-pentanediamine hydrochloride is added, and the mixture is heated to 70 °C and reacted for 1.5 h under nitrogen conditions, followed by rotary evaporation and drying to obtain amino-terminated castor oil. The dosage ratios of isocyanate-based castor oil, 1,5-pentanediamine hydrochloride, dibutyltin dilaurate, and toluene are 0.01 mol: 0.03 mol: 0.5 mL: 100 mL;

[0028] Step A3: Methoxypolyethylene glycol glycidyl ether (number average molecular weight of 1000) and mercaptoethylamine are mixed evenly in ethanol, stirred and refluxed for reaction for 12 h, n-hexane is added and stirred for 10 min, left to stand, the lower layer product is collected, and rotary evaporation is carried out to obtain mercapto-functionalized polyethylene glycol derivative. The dosage ratios of methoxypolyethylene glycol glycidyl ether, mercaptoethylamine, ethanol, and n-hexane are 0.1 mol: 0.1 mol: 100 mL: 300 mL;

[0029] Step A4: The amino-terminated castor oil, mercapto-functionalized polyethylene glycol derivative, and photoinitiator 1173 are mixed and stirred evenly, transferred to be irradiated under an ultraviolet lamp for 2.5 h, ethyl acetate is added and stirred for 5 min, washed, dried, filtered, and rotary evaporated to obtain the castor oil-based enhancer. The molar ratio of the carbon-carbon double bond in the amino-terminated castor oil to the mercapto group in the mercapto-functionalized polyethylene glycol derivative is 1:1. The photoinitiator 1173 is 1.5 wt% of the total amount of the reactants, and ethyl acetate is 10 wt% of the total amount of the reactants. [[ID=?]] [[ID=?]]

[0030] Example 2: The castor oil-based enhancer is prepared by the following steps:

[0031] Step A1: Under nitrogen atmosphere, isophorone diisocyanate and dibutyltin dilaurate were mixed and stirred evenly in N,N-dimethylformamide. Castor oil was added and heated to 65 °C, followed by stirring and reacting for 2.5 h. Then, vacuum distillation was carried out to obtain isocyanate-based castor oil. The dosage ratio of isophorone diisocyanate, dibutyltin dilaurate, castor oil and N,N-dimethylformamide was 0.151 mol: 3.5 mL: 0.05 mol: 200 mL;

[0032] Step A2: Isocyanate-based castor oil and dibutyltin dilaurate were stirred evenly in toluene. Then, 1,5-pentanediamine hydrochloride was added, and the mixture was heated to 70 °C and reacted for 2 h under nitrogen atmosphere. Rotary evaporation and drying were carried out to obtain amino-terminated castor oil. The dosage ratio of isocyanate-based castor oil, 1,5-pentanediamine hydrochloride, dibutyltin dilaurate and toluene was 0.01 mol: 0.031 mol: 0.75 mL: 100 mL;

[0033] Step A3: Methoxypolyethylene glycol glycidyl ether (number average molecular weight of 1000) and mercaptoethylamine were mixed evenly in ethanol, followed by stirring and refluxing for 12 h. Then, n-hexane was added and stirred for 10 min. After standing, the lower layer product was collected and rotary evaporation was carried out to obtain mercapto-functionalized polyethylene glycol derivative. The dosage ratio of methoxypolyethylene glycol glycidyl ether, mercaptoethylamine, ethanol and n-hexane was 0.1 mol: 0.1 mol: 100 mL: 300 mL;

[0034] Step A4: Amino-terminated castor oil, mercapto-functionalized polyethylene glycol derivative and photoinitiator 1173 were mixed and stirred evenly, and then transferred to be irradiated under ultraviolet lamp for 3 h. Ethyl acetate was added and stirred for 5 min. Washing, drying, filtration and rotary evaporation were carried out to obtain castor oil-based enhancer. The molar ratio of carbon-carbon double bond in amino-terminated castor oil to mercapto group in mercapto-functionalized polyethylene glycol derivative was 1.5:1. The photoinitiator 1173 was 1.75 wt% of the total amount of reactants, and ethyl acetate was 15 wt% of the total amount of reactants.

[0035] Example 3: The castor oil-based enhancer was prepared by the following steps:

[0036] Step A1: Under nitrogen atmosphere, isophorone diisocyanate and dibutyltin dilaurate were mixed and stirred evenly in N,N-dimethylformamide. Castor oil was added and heated to 70 °C, followed by stirring and reacting for 3 h. Then, vacuum distillation was carried out to obtain isocyanate-based castor oil. The dosage ratio of isophorone diisocyanate, dibutyltin dilaurate, castor oil and N,N-dimethylformamide was 0.153 mol: 4 mL: 0.05 mol: 200 mL;

[0037] Step A2: Stir the isocyanate group castor oil and dibutyltin dilaurate evenly in toluene, then add 1,5-pentanediamine hydrochloride, heat to 70 °C, and react for 2.5 h under nitrogen conditions. Rotate evaporate and dry to obtain the amino-terminated castor oil. The dosage ratio of isocyanate group castor oil, 1,5-pentanediamine hydrochloride, dibutyltin dilaurate and toluene is 0.01 mol: 0.032 mol: 1 mL: 100 mL;

[0038] Step A3: Mix the polyethylene glycol monomethyl ether glycidyl ether (number average molecular weight is 1000) and mercaptoethylamine evenly in ethanol, stir and reflux for 12 h, add n-hexane and stir for 10 min, let stand, collect the lower layer product, and rotate evaporate to obtain the mercapto-functionalized polyethylene glycol derivative. The dosage ratio of polyethylene glycol monomethyl ether glycidyl ether, mercaptoethylamine, ethanol and n-hexane is 0.1 mol: 0.1 mol: 100 mL: 300 mL;

[0039] Step A4: Mix the amino-terminated castor oil, mercapto-functionalized polyethylene glycol derivative and photoinitiator 1173 evenly, transfer to under ultraviolet light and irradiate for 3.5 h, add ethyl acetate and stir for 5 min, wash, dry, filter, and rotate evaporate to obtain the castor oil-based enhancer. The molar ratio of the carbon-carbon double bond in the amino-terminated castor oil to the mercapto group in the mercapto-functionalized polyethylene glycol derivative is 2:1. The photoinitiator 1173 is 2 wt% of the total amount of reactants, and ethyl acetate is 20 wt% of the total amount of reactants.

[0040] Example 4: A preparation method of a low-temperature resistant nylon composite material includes the following steps:

[0041] 645 parts of nylon 6, 15 parts of nylon 66, 2 parts of the castor oil-based enhancer prepared in Example 1, 7 parts of glass fiber, 5 parts of maleic anhydride grafted POE, 0.5 part of silicone powder, 0.5 part of oleic acid amide, 0.7 part of antioxidant 1010, 1 part of silane coupling agent KH550;

[0042] Weigh the raw materials by weight. After drying nylon 6 and nylon 66, add the castor oil-based enhancer, glass fiber, maleic anhydride grafted POE, silicone powder, oleic acid amide, antioxidant 101 and silane coupling agent KH550 prepared in Example 1 and mix evenly, then transfer to a twin-screw extruder for plasticization, extrusion and pelletizing to obtain the low-temperature resistant nylon composite material. The screw temperature of the twin-screw extruder is 260 °C and the screw speed is 150 r / min.

[0043] Example 5: A preparation method of a low-temperature resistant nylon composite material includes the following steps:

[0044] 650 parts of nylon 6, 20 parts of nylon 66, 3.5 parts of the castor oil-based reinforcing agent prepared in Example 2, 9 parts of glass fiber, 7.5 parts of maleic anhydride-grafted POE, 0.75 part of silicone powder, 1 part of oleic acid amide, 1 part of antioxidant 1076, 1.5 parts of silane coupling agent KH560;

[0045] Weigh the raw materials by weight. After drying nylon 6 and nylon 66, add the castor oil-based reinforcing agent, glass fiber, maleic anhydride-grafted POE, silicone powder, oleic acid amide, antioxidant 1076 and silane coupling agent KH560 prepared in Example 2, and mix and stir evenly. Then transfer it to a twin-screw extruder for plasticization, extrusion and pelletizing to obtain a low-temperature resistant nylon composite material. The screw temperature of the twin-screw extruder is 270 °C and the screw speed is 200 r / min.

[0046] Example 6: A preparation method of a low-temperature resistant nylon composite material includes the following steps:

[0047] 55 parts of nylon 6, 25 parts of nylon 66, 5 parts of the castor oil-based reinforcing agent prepared in Example 3, 10 parts of glass fiber, 10 parts of maleic anhydride-grafted POE, 1 part of silicone powder, 2 parts of oleic acid amide, 1.5 parts of antioxidant 1076, 2 parts of silane coupling agent KH570; [[ID=IO]]

[0048] Weigh the raw materials by weight. After drying nylon 6 and nylon 66, add the castor oil-based reinforcing agent, glass fiber, maleic anhydride-grafted POE, silicone powder, oleic acid amide, antioxidant 1076 and silane coupling agent KH570 prepared in Example 3, and mix and stir evenly. Then transfer it to a twin-screw extruder for plasticization, extrusion and pelletizing to obtain a low-temperature resistant nylon composite material. The screw temperature of the twin-screw extruder is 280 °C and the screw speed is 250 r / min.

[0049] Comparative Example 1: This comparative example is a nylon composite material. The difference from Example 6 is that a commercially available castor oil is used instead of the castor oil-based reinforcing agent prepared in Example 3, and the rest are the same.

[0050] Comparative Example 2: This comparative example is a nylon composite material. The difference from Example 6 is that a commercially available polyethylene glycol (molecular weight 1000) is used instead of the castor oil-based reinforcing agent prepared in Example 3, and the rest are the same.

[0051] Comparative Example 3: This comparative example is a nylon composite material. The difference from Example 6 is that the castor oil-based reinforcing agent prepared in Example 3 is not added, and the rest are the same. [[ID=2S]]

[0052] The nylon composites prepared in Examples 4-6 and Comparative Examples 1-3 were subjected to low-temperature resistance tests at 25°C, -40°C, and -50°C according to the standard of GB / T 1043.1-2008 "Determination of Charpy Impact Properties of Plastics"; the test results are shown in Table 1:

[0053] Table 1: Performance Test Results

[0054]

[0055] As can be seen from Table 1, when the nylon composites prepared by the present invention were subjected to notched impact strength tests at 25°C, -40°C, and -50°C, the notched impact strength at -40°C was in the range of (14.9 - 15.8) kJ / m 2 , and the notched impact strength at -50°C was in the range of (14.1 - 14.8) kJ / m 2 , indicating that the nylon composite has excellent low-temperature resistance.

[0056] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A low-temperature resistant nylon composite material, characterized in that, It comprises the following raw materials in parts by weight: 45-55 parts of nylon 6, 15-25 parts of nylon 66, 2-5 parts of castor oil-based reinforcing agent, 7-10 parts of glass fiber, 5-10 parts of toughening agent, 0.5-1 part of dispersant, 0.5-2 parts of lubricant, 0.7-1.5 parts of antioxidant, and 1-2 parts of coupling agent; The castor oil-based reinforcing agent is prepared by reacting terminal amino castor oil with mercapto poly(ethylene glycol) derivative. The terminal amino castor oil is prepared by reacting isocyanate group castor oil with 1,5-pentanediamine hydrochloride. The isocyanate group castor oil is prepared by reacting isophorone diisocyanate with castor oil. The mercapto poly(ethylene glycol) derivative is prepared by reacting methoxypolyethylene glycol glycidyl ether with 2-aminoethanethiol.

2. The low-temperature resistant nylon composite material according to claim 1, characterized in that, The castor oil-based reinforcing agent is prepared by the following steps: Step A1: Under nitrogen atmosphere, isophorone diisocyanate and dibutyltin dilaurate are mixed and stirred evenly in N,N-dimethylformamide, then castor oil is added and heated to 60-70 °C, and stirred for reaction for 2-3 h, followed by vacuum distillation to obtain isocyanate group castor oil; Step A2: Isocyanate group castor oil and dibutyltin dilaurate are stirred evenly in toluene, then 1,5-pentanediamine hydrochloride is added, heated to 70 °C, and reacted for 1.5-2.5 h under nitrogen atmosphere, then rotary evaporation and drying are carried out to obtain terminal amino castor oil; Step A3: Methoxypolyethylene glycol glycidyl ether and 2-aminoethanethiol are mixed evenly in ethanol, stirred and refluxed for reaction for 12 h, n-hexane is added and stirred for 10 min, then left to stand, and the lower layer product is collected, followed by rotary evaporation to obtain mercapto poly(ethylene glycol) derivative; Step A4: Terminal amino castor oil, mercapto poly(ethylene glycol) derivative and photoinitiator 1173 are mixed and stirred evenly, transferred to be irradiated under an ultraviolet lamp for 2.5-3.5 h, ethyl acetate is added and stirred for 5 min, then washed, dried, filtered and rotary evaporated to obtain the castor oil-based reinforcing agent.

3. The low-temperature resistant nylon composite material according to claim 2, characterized in that, In Step A1, the dosage ratio of isophorone diisocyanate, dibutyltin dilaurate, castor oil and N,N-dimethylformamide is 0.15-0.153 mol: 3-4 mL: 0.05 mol: 200 mL.

4. A low-temperature resistant nylon composite material according to claim 2, characterized in that In Step A2, the dosage ratio of isocyanate group castor oil, 1,5-pentanediamine hydrochloride, dibutyltin dilaurate and toluene is 0.01 mol: 0.03-0.032 mol: 0.5-1 mL: 100 mL.

5. A low-temperature resistant nylon composite material according to claim 2, characterized in that, In Step A3, the dosage ratio of methoxypolyethylene glycol glycidyl ether, 2-aminoethanethiol, ethanol and n-hexane is 0.1 mol: 0.1 mol: 100 mL: 300 mL.

6. The low-temperature resistant nylon composite material according to claim 2, wherein In Step A4, the molar ratio of carbon-carbon double bond in terminal amino castor oil to mercapto group in mercapto poly(ethylene glycol) derivative is 1-2:

1.

7. The low-temperature resistant nylon composite material according to claim 2, characterized in that, In Step A4, the photoinitiator 1173 is 1.5 wt%-2 wt% of the total amount of reactants, and ethyl acetate is 10 wt%-20 wt% of the total amount of reactants.

8. The low-temperature resistant nylon composite material according to claim 1, wherein, The toughening agent is maleic anhydride grafted POE, the dispersant is silicone powder, the lubricant is oleic acid amide, the antioxidant is one of antioxidant 1010 or antioxidant 1076, and the coupling agent is one of silane coupling agents KH550, KH560 or KH570.

9. A method for preparing the low-temperature resistant nylon composite material according to any one of claims 1-8, characterized in that, It includes the following steps: Weigh the raw materials by weight. After drying nylon 6 and nylon 66, add castor oil-based reinforcing agent, glass fiber, toughening agent, dispersant, lubricant, antioxidant and coupling agent, mix and stir evenly, and then transfer to a twin-screw extruder for plasticization, extrusion and pelletization to obtain the low-temperature resistant nylon composite material.

10. The preparation method of a low-temperature resistant nylon composite material according to claim 9, characterized in that, The screw temperature of the twin-screw extruder is 260 - 280 °C, and the screw speed is 150 - 250 r / min.

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