A toughened nylon 6 composite material and its preparation method

Abstract

This invention discloses a toughened nylon 6 composite material and its preparation method. The composite material composition comprises the following components in parts by weight: 79.9–89.7% nylon 6, 5–10% polyether block amide copolymer, 5–15% Surlyn resin, and 0.1–0.3% copper-based antioxidant. The preparation process includes two steps: premixing and twin-screw compounding and granulation. The polar ionic structure of Surlyn resin provides good compatibility with the polar nylon 6 matrix. The high-toughness Surlyn resin and polyether block amide copolymer exhibit higher toughness than nylon 6, thus toughening nylon 6 while maintaining the composite material's high strength and rigidity. If this composite material is combined with fiber-reinforced materials, its application in the field of high-strength, high-toughness structural materials is expected to be further expanded.

Description

Technical Field

[0001] This invention relates to the field of nylon 6 composite materials technology, and in particular to a toughened nylon 6 composite material and its preparation method. Background Technology

[0002] Nylon 6 is the most produced, most diverse, and most widely used of the five major general-purpose engineering plastics. Compared with other engineering plastics, it has outstanding advantages such as corrosion resistance, oil resistance, heat resistance, and processing fluidity. However, it has poor toughness at low temperatures or under high loads, low notched impact strength, and is prone to brittle fracture at the notch. Furthermore, Nylon 6 has strong hygroscopicity, leading to poor dimensional stability in its products. Therefore, toughening modification of Nylon 6 to compensate for its performance deficiencies is of great significance for expanding its applications.

[0003] The most common toughening modification method currently is to blend nylon 6 with plastics such as PP, PE, ABS, PET, PC, POM, and PPO, or with elastomers such as thermoplastic polyurethane and EPDM rubber. This allows nylon 6 to complement the advantages of other materials, effectively improving its toughness and dimensional stability, and reducing water absorption. However, most elastomers have low polarity, resulting in weak interfacial adhesion and poor compatibility with the matrix material. Therefore, it is necessary to toughen PA6 together with the elastomer and its GMA / MAH grafted modified product. Furthermore, these elastomers themselves have low hardness, so this toughening method is accompanied by a certain loss of other mechanical properties such as stiffness. Increasing the amount of elastomer toughening agent added will significantly reduce both tensile and flexural strength. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a toughened nylon 6 composite material and its preparation method. The nylon 6 composite material obtained by the process of this invention simultaneously possesses high impact strength, tensile strength, and flexural strength, solving the problems caused by the poor toughness, low notched impact strength, and brittle fracture at the notch of nylon 6. If this composite material is combined with fiber-reinforced materials, it is expected to further expand its application in the field of high-strength and high-toughness structural materials.

[0005] This invention is achieved through the following technical solution:

[0006] A toughened nylon 6 composite material, comprising the following components in parts by weight:

[0007] Nylon 6 79.9 ~ 89.7;

[0008] PEBA 5 ~ 10;

[0009] Surlyn resin 5 ~ 15;

[0010] Copper-based antioxidants: 0.1 ~ 0.3;

[0011] The density of the nylon 6 is 1.1 ± 0.1 g / cm³. 3 The relative viscosity is 2.80~3.00.

[0012] The density of the PEBA is 1.0 ± 0.1 g / cm³. 3 Its softening point is 170±10℃, and its melting temperature is around 190~220℃.

[0013] The Surlyn resin is an ionomer prepared using ethylene / methacrylic acid copolymer (EMAA) as a precursor, with a density of approximately 0.80~0.98 g / cm³. 3 The melt flow rate is 2.0~10.0 g / 10min.

[0014] The antioxidant is an organic copper salt composite heat stabilizer H3336, which appears as a light green powder.

[0015] The preparation method of the nylon 6 composite includes the following steps:

[0016] S1, Premixing: Nylon 6, PEBA, Surlyn resin and antioxidant are added to a high-speed mixer in sequence for premixing. The mixing temperature is 20-50℃, the rotation speed is 200-400 rpm, and the mixing time is 3-5 minutes to obtain a premix of nylon 6 composite material.

[0017] S2, Twin-screw extruder mixing and granulation: The premix obtained in step S1 is added to a twin-screw extruder for high-strength mixing and then cold-water granulation to obtain the nylon 6 composite material. Specific process conditions are as follows: granulation is performed using a twin-screw extruder with a length-to-diameter ratio of 40:1 and a screw diameter of 35mm; the feeder speed is set to 10-50 rpm, and the rotor speed is 200-400 rpm; the temperature of each section of the extruder is 200-240℃, resulting in nylon 6 composite material granules.

[0018] S3. Place the extruded granules into a forced-air drying oven and dry at 85~90 ℃ for 5 hours. Then use an injection molding machine to injection mold the granules into standard tensile specimens, bending specimens and notched impact specimens (according to ISO 527-1:2012, ISO178:2001 standards).

[0019] The principle of this invention is as follows:

[0020] Surlyn resin, with ethylene / methacrylic acid copolymer as a precursor, exhibits good flexibility and impact resistance due to its ionomer structure. Its polar ionic structure, coupled with the ability of unneutralized carboxylic acid groups and neutralized carboxylic acid ions on its molecular chain to react with the amine groups in PA6 and PEBA, results in good compatibility with nylon 6. Blends of these two resins can be used to prepare PA6 / Surlyn alloys with balanced stiffness and toughness.

[0021] PEBA is composed of hard-segment polyamide and soft-segment polyether, covalently linked by ester bonds. The molecular weight of the polyether segment is approximately 400–3000 g / mol, and the molecular weight of the polyamide segment is approximately 500–5000 g / mol. By controlling the hard and soft segments and their ratio, elastomers with different flexibility and hardness can be obtained without adding any plasticizers. PEBA elastomers combine the stiffness of polyamide with the flexibility and elasticity of polyether, which is beneficial for increasing the toughness of nylon 6 composites. In addition, the large number of repeating amide segments in its macromolecular chain provides a certain degree of compatibility with nylon 6.

[0022] A twin-screw extruder with high-efficiency mixing capabilities, aided by the compatibilizing reaction products of Surlyn resin-nylon 6 and Surlyn resin-polyether block amide copolymers, can promote the dispersion of Surlyn resin in the copolymers of nylon 6 and polyether block amides. This ensures the composite material exhibits higher toughness and achieves a high-level balance between strength, rigidity, and toughness. Combining this composite material with fiber-reinforced materials is expected to further expand its applications in the field of high-strength, high-toughness structural materials.

[0023] Compared with the prior art, the present invention has the following advantages and effects:

[0024] (1) PEBA elastomer has the stiffness of polyamide and the flexibility and elasticity of polyether, which is beneficial to increase the toughness of nylon 6 composite material. In addition, there are a large number of amide repeating segments on its macromolecular chain, which have a certain compatibility with nylon 6.

[0025] (2) Surlyn resin, which uses ethylene / methacrylic acid copolymer as a precursor, has good flexibility and impact resistance due to its structural characteristics as an ionomer. Its polar ionic structure makes it compatible with the polar nylon 6 matrix, which is expected to expand its application in related fields.

[0026] (3) The twin-screw extruder with high-efficiency mixing effect can promote the dispersion of Surlyn resin in the copolymer of nylon 6 and polyether block amide under the action of the compatibilizing reaction products of Surlyn resin-nylon 6 and Surlyn resin-polyether block amide, which can ensure that the composite material has higher toughness and achieve a high-level balance of its strength, rigidity and toughness. If this composite material is combined with fiber-type reinforcing materials, it is expected to further expand its application in the field of high-strength and high-toughness structural materials. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0028] In the embodiments of the present invention, the nylon 6 used is YH800 from Hunan Yuehua Chemical Co., Ltd., with a measured density of 1.156 g / cm³. 3 The relative viscosity was 2.85 ± 0.03; the polyether block amide copolymer PEBA used was a product from Hebei Xuyang Company, with a measured density of 1.07 g / cm³. 3 The softening point is 164℃, and the melting temperature is approximately 208℃; the Surlyn resin used is DuPont PC2000, with a density of approximately 0.97 g / cm³. 3 The melt flow rate is 4.5 g / 10min (190℃, 2.16kg); the antioxidant used is H3336, an organic copper salt composite heat stabilizer from Yantai Xintelu New Material Technology Co., Ltd., which is a light green powder.

[0029] The test results regarding mechanical properties in the embodiments and comparative examples of this invention were obtained from the Instron 5965 universal testing machine and the CEAST 9050 pendulum impact testing machine. The test results include tensile strength, tensile modulus, flexural strength, and notched impact strength.

[0030] Example 1:

[0031] Weigh the raw materials according to the following ratio: 1696g of Nylon 6, 200g of PEBA, 100g of Surlyn resin, and 4g of antioxidant. Add Nylon 6, PEBA, Surlyn resin, and antioxidant sequentially to a high-speed mixer for premixing at 40℃ and 500 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 250 rpm, feeder speed 40 rpm, and extruder temperature 200–240℃ for each section. The extruded granules are then washed and granulated. The granules obtained from extrusion are placed in a forced-air drying oven and dried at 85–90℃ for 5 hours. Then, the granules are injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0032] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0033] Example 2:

[0034] Weigh the raw materials according to the following proportions: 1794 g of nylon 6, 100 g of polyether block amide copolymer, 100 g of Surlyn resin, and 6 g of antioxidant. Add nylon 6, PEBA, Surlyn resin, aluminum magnesium hydrotalcite, and antioxidant sequentially to a high-speed mixer for premixing at 40°C and 500 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 250 rpm, feeder speed 40 rpm, and extruder section temperature 200–240°C. The extruder is then stretched, washed, and pelletized. The extruded granules are placed in a forced-air drying oven and dried at 85~90 ℃ for 5 hours. Then, the granules are injection molded into standard tensile specimens, flexural specimens and notched impact specimens using an injection molding machine (according to ISO527-1:2012, ISO 178:2001 standards).

[0035] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0036] Example 3:

[0037] Weigh the raw materials according to the following ratio: 1696g of Nylon 6, 100g of PEBA, 200g of Surlyn resin, and 4g of antioxidant. Add Nylon 6, PEBA, Surlyn resin, and antioxidant sequentially to a high-speed mixer for premixing at 40℃ and 500 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 250 rpm, feeder speed 40 rpm, and extruder section temperature 200–240℃. The extruded granules are then washed and granulated. The granules obtained from extrusion are placed in a forced-air drying oven and dried at 85–90℃ for 5 hours. Then, the granules are injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0038] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0039] Example 4:

[0040] Weigh the raw materials according to the following ratio: 1598g of Nylon 6, 100g of PEBA, 300g of Surlyn resin, and 2g of antioxidant. Add Nylon 6, PEBA, Surlyn resin, and antioxidant sequentially to a high-speed mixer for premixing at 40℃ and 500 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 250 rpm, feeder speed 40 rpm, and extruder temperature 200–240℃ for each section. The extruded granules are then washed and granulated. The granules obtained from extrusion are placed in a forced-air drying oven and dried at 85–90℃ for 5 hours. Then, the granules are injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0041] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0042] Comparative Example 1:

[0043] Weigh the raw materials according to the following ratio: 1894g of Nylon 6, 100g of PEBA, and 6g of antioxidant. Add Nylon 6, PEBA, and antioxidant sequentially to a high-speed mixer for premixing at 30℃ and 400 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 200 rpm, feeder speed 30 rpm, and extruder temperature 200–240℃ for each section. The extruded granules are then washed and granulated. The granules obtained from extrusion are placed in a forced-air drying oven and dried at 85–90℃ for 5 hours. Then, the granules are injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0044] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0045] Comparative Example 2:

[0046] Weigh the raw materials according to the following ratio: 1894g of Nylon 6, 100g of Surlyn resin, and 6g of antioxidant. Add Nylon 6, Surlyn resin, and antioxidant sequentially to a high-speed mixer for premixing at 30℃ and 400 rpm for 3 minutes. Then, feed this premixed material into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions are set as follows: screw speed 200 rpm, feeder speed 30 rpm, and extruder temperature 200–240℃ for each section. The extruded granules are then washed and granulated. The granules obtained from extrusion are placed in a forced-air drying oven and dried at 85–90℃ for 5 hours. Then, the granules are injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0047] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0048] Comparative Example 3:

[0049] Nylon 6 was premixed in a high-speed mixer (undergoing the same processing steps) at a mixing temperature of 30°C and a speed of 400 rpm for 3 minutes. This premixed material was then fed into a co-rotating parallel twin-screw extruder for melt extrusion granulation. The process conditions were set as follows: screw speed 200 rpm, feeder speed 30 rpm, and extruder temperatures of 200–240°C. The extruded strands were then washed and pelletized. The extruded granules were placed in a forced-air drying oven and dried at 85–90°C for 5 hours. Then, the granules were injection molded into standard tensile, flexural, and notched impact test specimens (according to ISO 527-1:2012 and ISO 178:2001 standards).

[0050] The specimens were placed in an 80℃ oven for 4 hours before measurement. Tensile, bending, and impact tests were performed using an Instron 5965 universal testing machine and a CEAST 9050 pendulum impact testing machine, respectively. Tensile testing was conducted according to standard GB / T1040.1-2006, with a tensile rate of 50 mm / min and a span of 64 mm. Bending modulus and bending strength tests were conducted according to standard GB / T 9341-2008, with bending rates of 1 mm / min (strain <0.3%) and 10 mm / min (strain >0.3%), respectively, and a deflection of 20 mm under compression. Impact testing was conducted according to standard GB / T 1843-2008, with a pendulum energy of 20 J. The test results are shown in Table 1.

[0051] Table 1. Mechanical properties of nylon 6 and composite materials obtained in the examples and comparative examples.

[0052]

[0053] As described above, in order to overcome the problem of poor toughening effect of nylon materials under the prior art, the present invention uses a copolymer of polyether block amide (PEBA) and Surlyn resin to toughen and modify nylon 6.

[0054] PEBA is a type of polyether block amide elastomer that combines the stiffness of polyamide with the flexibility and elasticity of polyether. The amide segments in its molecule give it good compatibility with nylon 6, and blending the two helps increase the toughness of nylon 6 composites. Surlyn resin is a copolymer prepared by free radical polymerization of ethylene / methacrylic acid copolymer (EMAA) as a precursor under high temperature and high pressure. Due to the presence of ionic groups, the ionomer can effectively optimize its physical properties. For example, Surlyn resin combines the advantages of both organic acrylic polymers and inorganic ionic compounds, exhibiting excellent transparency, low-temperature impact toughness, and chemical resistance. Furthermore, its polar ionic structure ensures good compatibility with the polar nylon 6 matrix.

[0055] The copolymer of Surlyn resin and polyether block amide, which has high toughness, has higher toughness than nylon 6. As a blending component, it can effectively toughen nylon 6 while maintaining the high strength and rigidity of the composite material.

[0056] This invention employs a twin-screw extruder with high-efficiency mixing effect. Under the action of the reaction products of Surlyn resin-nylon 6 and Surlyn resin-polyether block amide copolymers with compatibilizing effect, the dispersion of Surlyn resin in the copolymer of nylon 6 and polyether block amide can be promoted, which can ensure that the composite material has higher toughness and achieve a high-level balance of its strength, rigidity and toughness.

[0057] By mixing selected PEBA and Surlyn resins, the impact strength of nylon 6 composites can be significantly improved, effectively achieving toughening modification of nylon 6. At the same time, the tensile and flexural properties of the material are also improved to a certain extent, giving the product better mechanical properties. If this composite material is combined with fiber-type reinforcing materials, it is expected to further expand its application in the field of high-strength and high-toughness structural materials.

[0058] The implementation of the present invention is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A toughened nylon 6 composite material, characterized by The following components are included in the following amounts by mass: Nylon 6 1598 grams; Polyether block amide copolymer 100 grams; Surlyn resin 300 grams; Copper antioxidant 2 grams; The nylon 6 has a density of 1.1±0.1 g / cm3 and a relative viscosity of 2.80-3.00; The polyether block amide copolymer is a caprolactam and tetrahydrofuran copolymer having a density of 1.0±0.1 g / cm3, a measured softening point of 170±10℃, and a melting temperature of 190-220℃; The Surlyn resin is an ionomer prepared from an ethylene / methacrylic acid copolymer having a density of 0.80 to 0.95 g / cm 3 and a melt flow rate of 2.0 to 10.0 g / 10 min.

2. The toughened nylon 6 composite of claim 1, wherein, The antioxidant is organic copper salt composite heat stabilizer H3336, which is a light green powder.

3. Process for the production of the toughened nylon 6 composite material according to any one of claims 1-2, characterized in that, The following steps are included: S1, pre-mixing: sequentially add nylon 6, polyether block amide copolymer, Surlyn resin, and antioxidant to a high-speed mixer for pre-mixing, with a mixing temperature of 20-50℃, a rotation speed of 100-300 rpm, and a mixing time of 3-5 minutes, to obtain a pre-mix of the nylon 6 composite material; S2, twin-screw extruder mixing and granulation: add the pre-mix obtained in step S1 to a twin-screw extruder for high-intensity mixing and cold water drawing and cutting, to obtain the nylon 6 composite material.

4. The method for preparing the toughened nylon 6 composite material according to claim 3, characterized in that, In step S2, the pre-mix obtained in step S1 is added to a twin-screw extruder for high-intensity mixing and cold water drawing and cutting, with the following process conditions: extrusion and granulation using a twin-screw extruder with a length-diameter ratio of 40:1 and a screw diameter of 35 mm; the rotation speed of the feeder is set to 10-50 rpm, and the rotation speed of the twin-screw extruder is 200-400 rpm; the temperature of each section of the extruder is 200-240℃, to obtain nylon 6 composite material granules.

5. The method for preparing the toughened nylon 6 composite material according to claim 3, characterized in that, The granules obtained by extrusion and granulation in step S2 are placed in a forced air drying oven and dried at 85-90℃ for 5 hours, and then the granules are injection molded into standard tensile bars, bending bars, and notched impact bars using an injection molding machine. The following components are included in the following amounts by mass: Nylon 6 1598 grams; Polyether block amide copolymer 100 grams; Surlyn resin 300 grams; Copper antioxidant 2 grams; The nylon 6 has a density of 1.1±0.1 g / cm3 and a relative viscosity of 2.80-3.00; The polyether block amide copolymer is a caprolactam and tetrahydrofuran copolymer having a density of 1.0±0.1 g / cm3, a measured softening point of 170±10℃, and a melting temperature of 190-220℃; The antioxidant is organic copper salt composite heat stabilizer H3336, which is a light green powder. The following steps are included: S1, pre-mixing: sequentially add nylon 6, polyether block amide copolymer, Surlyn resin, and antioxidant to a high-speed mixer for pre-mixing, with a mixing temperature of 20-50℃, a rotation speed of 100-300 rpm, and a mixing time of 3-5 minutes, to obtain a pre-mix of the nylon 6 composite material; S2, twin-screw extruder mixing and granulation: add the pre-mix obtained in step S1 to a twin-screw extruder for high-intensity mixing and cold water drawing and cutting, to obtain the nylon 6 composite material. In step S2, the pre-mix obtained in step S1 is added to a twin-screw extruder for high-intensity mixing and cold water drawing and cutting, with the following process conditions: extrusion and granulation using a twin-screw extruder with a length-diameter ratio of 40:1 and a screw diameter of 35 mm; the rotation speed of the feeder is set to 10-50 rpm, and the rotation speed of the twin-screw extruder is 200-400 rpm; the temperature of each section of the extruder is 200-240℃, to obtain nylon 6 composite material granules. The granules obtained by extrusion and granulation in step S2 are placed in a forced air drying oven and dried at 85-90℃ for 5 hours, and then the granules are injection molded into standard tensile bars, bending bars, and notched impact bars using an injection molding machine.

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