Glass fiber reinforced nylon 6 composite material and preparation method thereof

Abstract

The present application relates to the technical field of nylon 6, and particularly relates to a glass fiber reinforced nylon 6 composite material and a preparation method thereof.The glass fiber reinforced nylon 6 composite material comprises, by mass fraction, nylon 6 70-90 parts, calcium sulfate whisker 5-10 parts, zirconium dioxide 1-5 parts, activated glass fiber 4-10 parts, polyester fiber 1-5 parts, maleic anhydride grafted polyethylene octene co-elastic body 5-12 parts, ethylene bis-stearamide 1-3 parts, nucleating agent 0.1-0.5 parts, antioxidant 1-2 parts, and silicon oil 0.1-0.5 parts.The present application uses activated glass fiber, so that the compatibility and wettability of the activated glass fiber and the nylon 6 melt are improved, the activated glass fiber is more easily wrapped by the resin in the processing process, the tendency of the glass fiber to migrate to the surface of the product and be exposed in the injection molding process is effectively reduced, and the smoothness and gloss of the surface of the product are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of nylon 6 technology, and more particularly to a glass fiber reinforced nylon 6 composite material and its preparation method. Background Technology

[0002] Nylon 6, as an important polyamide engineering plastic, is widely used in the automotive, electronics, machinery manufacturing, and textile industries due to its wide processing window and excellent chemical solvent resistance. However, the inherent brittleness of nylon 6 and its susceptibility to cracking under impact loads limit its application in environments requiring high reliability.

[0003] To improve the impact resistance of nylon 6, adding glass fibers for reinforcement and toughening is a common industry practice. The introduction of glass fibers significantly improves the dimensional stability and fatigue resistance of the composite material, thereby broadening its engineering applications. However, the interface between the glass fibers and the nylon 6 matrix is ​​prone to debonding under long-term high-temperature or thermal cycling conditions, leading to poor high-temperature dimensional stability and increased susceptibility to creep or performance degradation under high-temperature and high-load conditions. Furthermore, the addition of glass fibers during injection molding can easily cause a "floating fiber" phenomenon, which not only roughens the surface and reduces gloss, affecting appearance, but may also become stress concentration points and reduce surface abrasion resistance.

[0004] Currently, how to balance the relationship between strengthening the toughness of nylon 6 materials and heat resistance and surface gloss, while effectively improving impact performance and avoiding the decline in heat resistance and surface fiber defects as much as possible, has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a glass fiber reinforced nylon 6 composite material and its preparation method.

[0006] A glass fiber reinforced nylon 6 composite material, the raw materials of which include, by weight: 70-90 parts nylon 6, 5-10 parts calcium sulfate whiskers, 1-5 parts zirconium dioxide, 4-10 parts activated glass fiber, 1-5 parts polyester fiber, 5-12 parts maleic anhydride grafted polyethylene octene elastomer, 1-3 parts ethylene bis-stearamide, 0.1-0.5 parts nucleating agent, 1-2 parts antioxidant, and 0.1-0.5 parts silicone oil.

[0007] Preferably, the calcium sulfate whiskers have an average diameter of 1-8 μm and an average length of 50-100 μm.

[0008] Preferably, the nucleating agent is ultrafine talc powder and / or nano-silica.

[0009] Preferably, the antioxidants include: tris(2,4-di-tert-butyl)phosphite and antioxidant 1098.

[0010] More preferably, the mass ratio of tris(2,4-di-tert-butyl)phosphite to antioxidant 1098 is 1-2:1.

[0011] Preferably, the particle size of zirconium dioxide is 10-50 nm.

[0012] Preferably, the softening point of the polyester fiber is 230-240℃.

[0013] Preferably, the activated glass fiber is prepared by the following steps: immersing the glass fiber in sodium hydroxide solution at room temperature for 10-20 min, filtering, washing, vacuum drying, immersing in hydrochloric acid for 10-20 min, filtering, washing, vacuum drying, adding to an ethanol aqueous solution, adjusting the pH of the system to 8.5-9, adding dopamine hydrochloride and stirring for 2-4 h, adding aminopropyltriethoxysilane, refluxing and stirring at 80-85℃ for 10-30 min, filtering, washing, and vacuum drying.

[0014] More preferably, the mass ratio of glass fiber, dopamine hydrochloride, and aminopropyltriethoxysilane is 5-15:1-3:0.5-1.

[0015] More preferably, the sodium hydroxide solution has a mass fraction of 5-10%.

[0016] More preferably, the concentration of hydrochloric acid is 1-2 mol / L.

[0017] More preferably, the mass fraction of the ethanol aqueous solution is 50-60%.

[0018] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: mixing nylon 6, silicone oil, and zirconium dioxide for 1-3 min, then sequentially adding calcium sulfate whiskers, nucleating agent, antioxidant, maleic anhydride-grafted polyethylene octene co-elastomer, polyester fiber, and ethylene bis-stearamide and continuing to mix for 1-3 min; then melt extruding and granulating with activated glass fiber at an extrusion temperature of 220-250℃.

[0019] Preferably, a twin-screw extruder is used for extrusion granulation, with the screw length-to-diameter ratio of the twin-screw extruder being 35-40:1 and the screw speed being 200-500 r / min.

[0020] Compared with existing technologies, the present invention has the following advantages: This invention pretreats the glass fiber with alkali / acid to roughen its surface. By using a silane coupling agent in combination with dopamine hydrochloride, the interfacial bonding strength between the fiber and the nylon 6 matrix can be effectively enhanced. This ensures that stress can be effectively transferred from the matrix to the fiber when subjected to impact loads, significantly improving the toughness of the material. At the same time, the stable interface can effectively suppress creep and performance degradation caused by interfacial debonding in high-temperature environments, which is beneficial to maintaining the material's high-temperature dimensional stability and heat resistance.

[0021] This invention utilizes calcium sulfate whiskers and polyester fibers to form a reinforcing network within the material. This network, in synergy with activated glass fibers, effectively enhances the toughness of the system. Combined with the nucleating agent, it promotes the formation of a more complete and stable crystalline structure in the nylon 6 matrix, thereby improving the overall heat distortion temperature and high-temperature modulus retention rate of the system.

[0022] This invention employs surface-coated modified activated glass fibers, which improves their compatibility and wettability with nylon 6 melt, making them easier to be encapsulated by resin during processing. Simultaneously, the combined effects of silicone oil and ethylene bis-stearamide effectively enhance the dispersibility and flowability of each component during melt blending, effectively reducing the tendency of glass fibers to migrate to and become exposed on the product surface during injection molding, and significantly improving the smoothness and gloss of the product surface. Attached Figure Description

[0023] Figure 1 The graph shows a comparison of the tensile strength and flexural strength of the composite materials obtained in Example 5 and Comparative Examples 1-2.

[0024] Figure 2 The graph shows a comparison of the notched impact strength and heat distortion temperature of the composite materials obtained in Example 5 and Comparative Examples 1-2.

[0025] Figure 3 This is a comparison chart of the molding shrinkage rates of the composite materials obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to specific embodiments. The given embodiments are merely illustrative of the invention and not intended to limit its scope. The embodiments provided below can serve as a guide for further improvements by those skilled in the art and do not constitute a limitation on the invention in any way.

[0027] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0028] The nylon 6 used below is sourced from Sinopec Baling, model PA6 BL2280-Z. The polyester fibers used below are purchased from Shandong Taicheng Fiber Co., Ltd., with a diameter of 10-25 μm and a melting point of 240-260℃. The maleic anhydride-grafted polyethylene octene elastomer (maleic anhydride-grafted POE) used below is sourced from Mitsui Chemicals, Japan, brand name TAFMER. TM MA9015. The silicone oil used below was purchased from Shandong Duolian Chemical Co., Ltd.

[0029] The calcium sulfate whiskers used below were purchased from Hubei Langbowan Biomedical Co., Ltd., with an average diameter of 1-8 μm and an average length of 50-100 μm. The zirconium dioxide used below was purchased from Nangong Jiuxin New Material Technology Co., Ltd., with a particle size of 10-50 nm. The ultrafine talc powder used below was purchased from Qingdao Haishengyuan Minerals Co., Ltd. The nano-silica used below was purchased from Beijing Huawirui Chemical Technology Co., Ltd. The glass fiber used below was chopped alkali-free glass fiber, purchased from Hebei Jiyan Mineral Products Co., Ltd., with a monofilament diameter of 10±2 μm and a length of 3-5 mm.

[0030] Example 1 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 70g nylon 6, 5g calcium sulfate whiskers, 1g zirconium dioxide, 4g activated glass fiber, 1g polyester fiber, 5g maleic anhydride-grafted polyethylene octene elastomer, 1g ethylene bis-stearamide, 0.1g ultrafine talc powder, 1g antioxidant, and 0.1g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1:1.

[0031] Activated glass fiber is prepared by the following steps: 5g of glass fiber is immersed in a 5% sodium hydroxide solution and activated at room temperature for 10min. After filtration, washing, and vacuum drying, it is immersed in a 1mol / L hydrochloric acid solution for 10min. After filtration, washing, and vacuum drying, it is added to 50g of a 50% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 1g of dopamine hydrochloride is added and stirred for 2h at a stirring speed of 100r / min. 0.5g of aminopropyltriethoxysilane is added and the mixture is refluxed at 80℃ for 10min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0032] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 1 min at a mixing speed of 400 r / min. Calcium sulfate whiskers, ultrafine talc powder, antioxidant, maleic anhydride-grafted polyethylene octene co-elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 1 min. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber for granulation. The extrusion temperature is 220℃, the screw length-to-diameter ratio of the twin-screw extruder is 35:1, and the screw speed is 200 r / min.

[0033] Example 2 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 90g nylon 6, 10g calcium sulfate whiskers, 5g zirconium dioxide, 10g activated glass fiber, 5g polyester fiber, 12g maleic anhydride-grafted polyethylene octene elastomer, 3g ethylene bis-stearamide, 0.5g nano-silica, 2g antioxidant, and 0.5g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 2:1.

[0034] Activated glass fiber is prepared by the following steps: 15g of glass fiber is immersed in a 10% sodium hydroxide solution and activated at room temperature for 20min. After filtration, washing, and vacuum drying, it is immersed in a 2mol / L hydrochloric acid solution for 20min. After filtration, washing, and vacuum drying, it is added to 70g of a 60% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 3g of dopamine hydrochloride is added and stirred for 4h at a stirring speed of 300r / min. 1g of aminopropyltriethoxysilane is added and the mixture is refluxed at 85℃ for 30min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0035] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 3 minutes at a mixing speed of 600 r / min. Calcium sulfate whiskers, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 3 minutes. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber to form granules. The extrusion temperature is 238℃, the screw length-to-diameter ratio of the twin-screw extruder is 40:1, and the screw speed is 500 r / min.

[0036] Example 3 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 75g nylon 6, 9g calcium sulfate whiskers, 2g zirconium dioxide, 8g activated glass fiber, 2g polyester fiber, 10g maleic anhydride-grafted polyethylene octene elastomer, 1.5g ethylene bis-stearamide, 0.1g ultrafine talc powder, 0.3g nano-silica, 1.2g antioxidant, and 0.4g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1.3:1.

[0037] Activated glass fiber is prepared by the following steps: 12g of glass fiber is immersed in a 7% sodium hydroxide solution and activated at room temperature for 18min. After filtration, washing, and vacuum drying, it is immersed in a 1.2mol / L hydrochloric acid solution for 18min. After filtration, washing, and vacuum drying, it is added to 55g of a 58% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 1.5g of dopamine hydrochloride is added and stirred for 3.5h at a stirring speed of 200r / min. 0.8g of aminopropyltriethoxysilane is added, and the mixture is refluxed and stirred at 81℃ for 25min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0038] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 1.5 min at a mixing speed of 550 r / min. Calcium sulfate whiskers, ultrafine talc powder, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 1.5 min. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber to form granules. The extrusion temperature is 240℃, the screw length-to-diameter ratio of the twin-screw extruder is 37:1, and the screw speed is 400 r / min.

[0039] Example 4 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 85g nylon 6, 7g calcium sulfate whiskers, 4g zirconium dioxide, 6g activated glass fiber, 4g polyester fiber, 6g maleic anhydride-grafted polyethylene octene elastomer, 2.5g ethylene bis-stearamide, 0.1g ultrafine talc powder, 0.1g nano-silica, 1.8g antioxidant, and 0.2g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1.7:1.

[0040] Activated glass fiber is prepared by the following steps: 8g of glass fiber is immersed in a 9% sodium hydroxide solution and activated at room temperature for 12min. After filtration, washing, and vacuum drying, it is immersed in 1.8mol / L hydrochloric acid for 12min. After filtration, washing, and vacuum drying, it is added to 65g of 52% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 2.5g of dopamine hydrochloride is added and stirred for 2.5h at a stirring speed of 400r / min. 0.6g of aminopropyltriethoxysilane is added, and the mixture is refluxed and stirred at 83℃ for 15min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0041] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 2.5 min at a mixing speed of 450 r / min. Calcium sulfate whiskers, ultrafine talc powder, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 2.5 min. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber to form granules. The extrusion temperature is 230℃, the screw length-to-diameter ratio of the twin-screw extruder is 39:1, and the screw speed is 300 r / min.

[0042] Example 5 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 80g nylon 6, 8g calcium sulfate whiskers, 3g zirconium dioxide, 7g activated glass fiber, 3g polyester fiber, 8g maleic anhydride-grafted polyethylene octene elastomer, 2g ethylene bis-stearamide, 0.2g ultrafine talc powder, 0.1g nano-silica, 1.5g antioxidant, and 0.3g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1.5:1.

[0043] Activated glass fiber is prepared by the following steps: 10g of glass fiber is immersed in an 8% sodium hydroxide solution and activated at room temperature for 15min. After filtration, washing, and vacuum drying, it is immersed in 1.5mol / L hydrochloric acid for 15min. After filtration, washing, and vacuum drying, it is added to 60g of 55% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 2g of dopamine hydrochloride is added and stirred for 3h at a stirring speed of 300r / min. 0.7g of aminopropyltriethoxysilane is added and the mixture is refluxed at 82℃ for 20min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0044] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 2 minutes at a mixing speed of 500 r / min. Calcium sulfate whiskers, ultrafine talc powder, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene co-elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 2 minutes. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber for granulation. The extrusion temperature is 235℃, the screw length-to-diameter ratio of the twin-screw extruder is 38:1, and the screw speed is 350 r / min.

[0045] Comparative Example 1 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 80g nylon 6, 8g calcium sulfate whiskers, 3g zirconium dioxide, 7g activated glass fiber, 3g polyester fiber, 8g maleic anhydride-grafted polyethylene octene elastomer, 2g ethylene bis-stearamide, 0.2g ultrafine talc powder, 0.1g nano-silica, 1.5g antioxidant, and 0.3g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1.5:1.

[0046] Activated glass fiber is prepared by the following steps: 10g of glass fiber is immersed in an 8% sodium hydroxide solution and activated at room temperature for 15min. After filtration, washing, and vacuum drying, it is immersed in 1.5mol / L hydrochloric acid for 15min. After filtration, washing, and vacuum drying, it is added to 60g of a 55% ethanol aqueous solution. The pH of the system is adjusted to 8.5-9. 0.7g of aminopropyltriethoxysilane is added, and the mixture is refluxed and stirred at 82℃ for 20min. After filtration, washing, and vacuum drying, the glass fiber is prepared.

[0047] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 2 minutes at a mixing speed of 500 r / min. Calcium sulfate whiskers, ultrafine talc powder, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene co-elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 2 minutes. The mixture is then fed into a twin-screw extruder and melt-extruded with activated glass fiber for granulation. The extrusion temperature is 235℃, the screw length-to-diameter ratio of the twin-screw extruder is 38:1, and the screw speed is 350 r / min.

[0048] Comparative Example 2 A glass fiber reinforced nylon 6 composite material comprises the following raw materials: 80g nylon 6, 8g calcium sulfate whiskers, 3g zirconium dioxide, 7g glass fiber, 3g polyester fiber, 8g maleic anhydride-grafted polyethylene octene elastomer, 2g ethylene bis-stearamide, 0.2g ultrafine talc powder, 0.1g nano-silica, 1.5g antioxidant, and 0.3g silicone oil. The antioxidant is composed of tris(2,4-di-tert-butyl)phosphite and antioxidant 1098 in a mass ratio of 1.5:1.

[0049] The preparation method of the above-mentioned glass fiber reinforced nylon 6 composite material includes the following steps: Nylon 6, silicone oil, and zirconium dioxide are mixed in a high-speed mixer for 2 minutes at a mixing speed of 500 r / min. Calcium sulfate whiskers, ultrafine talc powder, nano-silica, antioxidant, maleic anhydride-grafted polyethylene octene co-elastomer, polyester fiber, and ethylene bis-stearamide are added sequentially and mixed for another 2 minutes. The mixture is then fed into a twin-screw extruder and melt-extruded with glass fiber to form granules. The extrusion temperature is 235℃, the screw length-to-diameter ratio of the twin-screw extruder is 38:1, and the screw speed is 350 r / min.

[0050] Observe the surface condition of the composite materials obtained in Example 5 and Comparative Examples 1-2. The composite material obtained in Comparative Example 2 has more floating fibers on the surface, the composite material obtained in Comparative Example 1 has more floating fibers on the surface (less than the surface floating fibers in Comparative Example 2), and the composite material obtained in Example 5 has very few floating fibers on the surface.

[0051] The tensile strength of the composite materials obtained in Example 5 and Comparative Examples 1-2 was determined with reference to GB / T 1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics".

[0052] The flexural strength of the composite materials obtained in Example 5 and Comparative Examples 1-2 was determined in accordance with GB / T 9341-2008 "Determination of Flexural Properties of Plastics".

[0053] like Figure 1 As shown, the composite material obtained in Example 5 has the highest tensile strength and flexural strength, which are significantly better than those of Comparative Examples 1-2.

[0054] The notched impact strength of the composite materials obtained in Example 5 and Comparative Examples 1-2 was determined with reference to GB / T 1043.1-2008 "Determination of impact properties of simply supported plastic beams - Part 1: Non-instrumental impact test".

[0055] The heat distortion temperatures of the composite materials obtained in Example 5 and Comparative Examples 1-2 were determined in accordance with GB / T 1634.1-2025 "Determination of Deformation Temperature of Plastics under Load - Part 1: General Test Method".

[0056] like Figure 2As shown, the composite material obtained in Example 5 has the highest notched impact strength and heat distortion temperature, which are significantly better than those of Comparative Examples 1-2.

[0057] The molding shrinkage of the composite materials obtained in Example 5 and Comparative Examples 1-2 was determined in accordance with GB / T 17037.4-2003 "Preparation of Injection Molded Specimens for Thermoplastic Plastic Materials - Part 4: Determination of Molding Shrinkage".

[0058] like Figure 3 As shown, the composite material obtained in Example 5 has the lowest molding shrinkage rate, which is significantly better than that of Comparative Examples 1-2.

[0059] The present invention has been described in detail above. Those skilled in the art will recognize that the invention can be practiced in a wide range of ways with equivalent parameters, concentrations, and conditions without departing from its spirit and scope, and without requiring unnecessary experiments. While specific embodiments have been provided, it should be understood that further modifications can be made to the invention. In summary, according to the principles of the invention, this application is intended to include any changes, uses, or improvements to the invention, including changes made using conventional techniques known in the art that depart from the scope disclosed herein.

Claims

1. A glass fiber reinforced nylon 6 composite material, characterized in that, The raw materials, by weight, include: 70-90 parts nylon 6, 5-10 parts calcium sulfate whiskers, 1-5 parts zirconium dioxide, 4-10 parts activated glass fiber, 1-5 parts polyester fiber, 5-12 parts maleic anhydride-grafted polyethylene octene elastomer, 1-3 parts ethylene bis-stearamide, 0.1-0.5 parts nucleating agent, 1-2 parts antioxidant, and 0.1-0.5 parts silicone oil.

2. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, The average diameter of calcium sulfate whiskers is 1-8 μm, and the average length is 50-100 μm.

3. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, The nucleating agent is ultrafine talc powder and / or nano silica.

4. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, Antioxidants include: Tris(2,4-di-tert-butyl)phosphite, antioxidant 1098.

5. The glass fiber reinforced nylon 6 composite material according to claim 4, characterized in that, The mass ratio of tris(2,4-di-tert-butyl)phosphite to antioxidant 1098 is 1-2:

1.

6. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, Zirconium dioxide has a particle size of 10-50 nm.

7. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, The softening point of polyester fiber is 230-240℃.

8. The glass fiber reinforced nylon 6 composite material according to claim 1, characterized in that, Activated glass fibers are prepared by the following steps: immersing the glass fibers in sodium hydroxide solution at room temperature for 10-20 min, filtering, washing, and vacuum drying; immersing in hydrochloric acid for 10-20 min, filtering, washing, and vacuum drying; adding to an ethanol aqueous solution, adjusting the pH of the system to 8.5-9, adding dopamine hydrochloride and stirring for 2-4 h; adding aminopropyltriethoxysilane, refluxing and stirring at 80-85℃ for 10-30 min, filtering, washing, and vacuum drying.

9. The glass fiber reinforced nylon 6 composite material according to claim 8, characterized in that, The mass ratio of glass fiber, dopamine hydrochloride, and aminopropyltriethoxysilane is 5-15:1-3:0.5-1.

10. A method for preparing the glass fiber reinforced nylon 6 composite material as described in any one of claims 1-9, characterized in that, The process includes the following steps: Mix nylon 6, silicone oil, and zirconium dioxide for 1-3 minutes, then add calcium sulfate whiskers, nucleating agent, antioxidant, maleic anhydride-grafted polyethylene octene elastomer, polyester fiber, and ethylene bis-stearamide in sequence and continue mixing for 1-3 minutes; then melt extrude and granulate with activated glass fiber at an extrusion temperature of 220-250℃.

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