Antistatic nylon-based composite material, preparation method thereof and polymer product

Abstract

The invention relates to an antistatic nylon-based composite material, a preparation method thereof and a polymer product. The antistatic nylon-based composite material is prepared from the following components in parts by mass: 40 to 70 parts of nylon resin, 0.5 to 1 part of antioxidant, 1 to 5 parts of flexibilizer, 10 to 25 parts of conductive carbon black and 15 to 40 parts of long glass fiber, the length of the long glass fiber is 8mm to 12mm; the specific surface area of the conductive carbon black is 50m < 2 > / g-200m < 2 > / g According to the anti-static nylon-based composite material, the mechanical property and the anti-static property of the nylon-based composite material are remarkably improved through mutual cooperation of all the components. Particularly, the long glass fibers with a specific ratio are added into the nylon resin matrix, so that the mechanical strength and toughness of the composite material can be remarkably improved at the same time. Furthermore, by adding specific components and conductive carbon black with a specific specific surface area, the composite material has a good antistatic effect and good mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to an antistatic nylon-based composite material and a preparation method thereof, and a polymer product. Background Art

[0002] Polyamide (PA), commonly known as nylon, is a nylon resin with excellent mechanical properties and heat resistance, and is widely used in industry. However, in some applications that require very high mechanical properties, pure nylon resin cannot meet the performance requirements. Fiber-reinforced nylon composites can greatly improve the shortcomings of nylon and improve its mechanical properties and heat deformation temperature, and have become the key research and development direction of nylon resin reinforcement and modification technology in recent years. Although traditional short-fiber reinforced nylon resins have achieved good reinforcement effects, in the process of short-fiber reinforced nylon, when the fibers are mixed with the resin in the extruder, the fibers will be greatly damaged due to the shear between the screw and the barrel; resulting in the performance of short-fiber reinforced nylon-based composites in terms of strength and toughness being difficult to meet in some application scenarios with extremely high requirements for strength and toughness.

[0003] In the field of electronics and electrical appliances, nylon-based composite materials are used to manufacture the shells, internal structural parts and connectors of various electronic devices. In the production, transportation and use of electronic equipment, static electricity is easily generated due to the friction, contact and separation between materials. The accumulation of static electricity will not only absorb dust and impurities, affecting the appearance and performance of electronic equipment, but also may cause electrostatic discharge. The generated electric sparks will damage electronic components and even cause equipment failure or failure, reducing the reliability and service life of the product. In the field of petrochemicals, nylon-based composite materials are often used to manufacture pipes, valves, containers and other components. In the storage, transportation and processing of petrochemical products, the friction between materials and the inner walls of pipes and containers will generate a large amount of static electricity. If static electricity cannot be removed in time, it may cause static sparks when accumulated to a certain extent, which will lead to the combustion or explosion of flammable and explosive materials, causing serious safety accidents. Summary of the invention

[0004] Based on this, it is necessary to provide a nylon-based composite material having good antistatic properties and good mechanical strength and toughness, a preparation method thereof, and a polymer product.

[0005] In a first aspect, the present application provides an antistatic nylon-based composite material, comprising the following components by weight:

[0006] 40~70 parts of nylon resin,

[0007] 0.5~1 part of antioxidant,

[0008] 1~5 parts of toughening agent,

[0009] 10 to 25 parts of conductive carbon black,

[0010] 15 to 40 parts of long glass fiber;

[0011] wherein, the length of the long glass fiber is 8 mm to 12 mm; the specific surface area of the conductive carbon black is 50 m 2 / g to 200 m 2 / g.

[0012] In the above antistatic nylon-based composite material, a specific proportion of conductive carbon black, long glass fiber, antioxidant and toughening agent are added to the nylon resin matrix, and the mechanical properties and antistatic properties of the nylon-based composite material are significantly improved through the mutual cooperation among the components. Specifically, adding a specific proportion of long glass fiber to the nylon resin matrix can significantly improve the mechanical strength and toughness of the composite material at the same time. Further, adding conductive carbon black makes the composite material have a good antistatic effect; at the same time, by controlling the composition and specific surface area of the conductive carbon black, not only can the antistatic performance of the nylon-based composite material be significantly improved, but also the dispersibility of the conductive carbon black in the nylon-based composite material can be improved, which is beneficial to further improving the mechanical properties of the nylon-based composite material.

[0013] In some embodiments, by mass parts, the antistatic nylon-based composite material comprises the following components:

[0014] 40 to 60 parts of nylon resin,

[0015] 0.5 to 0.8 part of antioxidant,

[0016] 4 to 5 parts of toughening agent,

[0017] 10 to 20 parts of conductive carbon black, and

[0018] 18 to 35 parts of long glass fiber.

[0019] In some embodiments, the oil absorption value of the conductive carbon black is 100 mL / 100 g to 200 mL / 100 g.

[0020] In some embodiments, the antistatic nylon-based composite material satisfies at least one of the following conditions:

[0021] (1) The linear density of the long glass fiber is 700 tex to 3600 tex;

[0022] (2) The long glass fiber is alkali-free glass fiber.

[0023] In some embodiments, the relative viscosity of the nylon resin is 1.8 to 2.8.

[0024] In some embodiments, the nylon resin is selected from one or more of nylon 6 and nylon 66.

[0025] In some embodiments, the toughening agent is selected from one or more of polyvinyl alcohol, maleic anhydride grafted polyolefin elastomer, maleic anhydride grafted polypropylene, and maleic anhydride grafted ethylene-propylene-diene rubber.

[0026] In some embodiments, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 168, antioxidant 3114, antioxidant 619, and antioxidant DSTP.

[0027] The second aspect of the present application provides a method for preparing the antistatic nylon-based composite material described in the first aspect of the present application, including the following steps:

[0028] Mix and melt the nylon resin, the antioxidant, the toughening agent, and the conductive carbon black according to the mass fraction ratio to obtain a mixed melt;

[0029] Immerse the long glass fiber in the mixed melt and form it to obtain the antistatic nylon-based composite material.

[0030] The third aspect of the present application provides a polymer product, and the raw materials for preparing the polymer product include the antistatic nylon-based composite material described in the first aspect of the present application. Detailed Embodiments

[0031] For the convenience of understanding the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] The terms "preferably", "more preferably", "more desirably", "even more desirably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain cases. However, in the same or other cases, other embodiments may also be preferred. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the present invention. That is, in the present invention, "preferably", "more preferably", "more desirably", "even more desirably", etc. are only used to describe embodiments or examples with better effects, but do not constitute a limitation on the protection scope of the present invention.

[0035] In the present invention, "further", "even further", "especially", etc. are used for descriptive purposes, indicating differences in content, but should not be construed as a limitation on the protection scope of the present invention.

[0036] When a numerical range is disclosed in the present invention, the above range is considered continuous and includes the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when the range refers to integers, it includes each integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein. And only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form a range not explicitly recited; and any lower limit can be combined with other lower limits to form a range not explicitly recited, and similarly any upper limit can be combined with any other upper limit to form a range not explicitly recited. In addition, each individually disclosed point or single numerical value itself can be used as a lower limit or upper limit and combined with any other point or single numerical value or combined with other lower limits or upper limits to form a range not explicitly recited.

[0037] The relative viscosity ηr in this application is calculated as follows: ηr = η / ηs; where η is the viscosity value of the solution obtained by dissolving 10 g of nylon resin in 90 g of dichloromethane solvent at 25°C and under a shear force condition of 10 S-1; ηs is the viscosity value of 90 g of pure dichloromethane solvent obtained by testing at 25°C and under a shear force condition of 10 S-1.

[0038] The absorption value of the conductive carbon black in this application refers to the volume of dibutyl phthalate (DBP) adsorbed by 100 g of dry conductive carbon black at 25°C.

[0039] In an embodiment of this application, an antistatic nylon-based composite material is provided, and by mass, it includes the following components:

[0040] Nylon resin 40 parts to 70 parts,

[0041] 0.5 to 1 part of antioxidant,

[0042] 1 to 5 parts of toughening agent,

[0043] 10 to 25 parts of conductive carbon black,

[0044] 15 to 40 parts of long glass fiber;

[0045] wherein, the length of the long glass fiber is 8 mm to 12 mm; the specific surface area of the conductive carbon black is 50 m 2 / g to 200 m 2 / g.

[0046] In the above antistatic nylon-based composite material, conductive carbon black, long glass fiber, antioxidant and toughening agent are added to the nylon resin matrix in a specific ratio, and the mechanical properties and antistatic properties of the nylon-based composite material are significantly improved through the mutual cooperation among the components. Specifically, adding long glass fiber in a specific ratio to the nylon resin matrix can significantly improve the mechanical strength and toughness of the composite material at the same time. Further, adding conductive carbon black makes the composite material have a good antistatic effect; at the same time, by controlling the component and specific surface area of the conductive carbon black, not only can the antistatic performance of the nylon-based composite material be significantly improved, but also the dispersion of the conductive carbon black in the nylon-based composite material can be improved, which is conducive to further improving the mechanical properties of the nylon-based composite material.

[0047] As an example, in the antistatic nylon-based composite material, the mass fraction of the nylon resin can be 40 parts, 42 parts, 44 parts, 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 65 parts, 67 parts, 68 parts or 70 parts; further, the mass fraction of the nylon resin can be any value within the range value formed by any two of the above point values as the end values. Preferably, the mass fraction of the nylon resin can be 40 parts to 60 parts; more preferably, the mass fraction of the nylon resin can be 44 parts to 55 parts.

[0048] As an example, in the antistatic nylon-based composite material, the mass fraction of the conductive carbon black can be 10 parts, 12 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts or 25 parts; further, the mass fraction of the conductive carbon black can be any value within the range value formed by any two of the above point values as the end values. Preferably, the mass fraction of the conductive carbon black can be 10 parts to 20 parts.

[0049] As an example, the specific surface area of the conductive carbon black can be 50 m 2 / g, 60 m 2 / g, 70 m 2 / g, 80 m 2 / g, 90 m2 / g, 100 m 2 / g, 110 m 2 / g, 120 m 2 / g, 130 m 2 / g, 140 m 2 / g, 150 m 2 / g, 160 m 2 / g, 170 m 2 / g, 180 m 2 / g, 190 m 2 / g or 200 m 2 / g; Further, the specific surface area of the conductive carbon black can be any value within the range formed by any two of the above point values as the end values. Even further, the specific surface area of the conductive carbon black is 120 m 2 / g ~ 150 m 2 / g. The conductive carbon black with a specific surface area within the above range can not only significantly improve the antistatic performance of the nylon-based composite material, but also improve the dispersibility of the conductive carbon black in the nylon-based composite material, and thus is beneficial to further improving the mechanical properties of the nylon-based composite material.

[0050] As an example, in the antistatic nylon-based composite material, the mass fraction of the long glass fiber can be 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 35 parts or 40 parts; further, the mass fraction of the long glass fiber can be any value within the range formed by any two of the above point values as the end values. Preferably, the mass fraction of the long glass fiber can be 18 parts ~ 35 parts; even further, the mass fraction of the long glass fiber can be 20 parts ~ 30 parts.

[0051] As an example, the length of the long glass fiber is 8 mm, 9 mm, 10 mm, 11 mm, 12 mm. Controlling the length of the long glass fiber is beneficial to maintaining the comprehensive performance of the material.

[0052] As an example, in the antistatic nylon-based composite material, the mass fraction of the antioxidant can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts or 1 part; further, the mass fraction of the antioxidant can be any value within the range formed by any two of the above point values as the end values. Preferably, the mass fraction of the antioxidant can be 0.5 parts ~ 0.8 parts.

[0053] As an example, in the antistatic nylon-based composite material, the mass fraction of the toughening agent can be 1 part, 2 parts, 3 parts, 4 parts or 5 parts; further, the mass fraction of the toughening agent can be any value within the range value formed by any two of the above point values as the end values. Preferably, the mass fraction of the toughening agent can be 4 parts to 5 parts. Controlling the mass fraction of the toughening agent in the antistatic nylon composite material can, on the basis of improving the toughness of the composite material, keep the composite material having good mechanical strength, such as tensile strength and flexural strength.

[0054] In some embodiments, by mass fraction, the antistatic nylon-based composite material comprises the following components:

[0055] Nylon resin 40 parts to 60 parts,

[0056] Antioxidant 0.5 part to 0.8 part,

[0057] Toughening agent 4 parts to 5 parts,

[0058] Conductive carbon black 10 parts to 20 parts, and

[0059] Long glass fiber 18 parts to 35 parts.

[0060] Further, by mass fraction, the antistatic nylon-based composite material comprises the following components:

[0061] Nylon resin 44 parts to 55 parts,

[0062] Antioxidant 0.5 part to 0.8 part,

[0063] Toughening agent 4 parts to 5 parts,

[0064] Conductive carbon black 10 parts to 20 parts, and

[0065] Long glass fiber 20 parts to 30 parts.

[0066] In some embodiments, the relative viscosity ηr of the nylon resin is 1.8 to 2.8. As an example, the relative viscosity of the nylon resin can be 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8. By controlling the viscosity of the nylon resin, the comprehensive performance of the material can be ensured.

[0067] In some embodiments, the nylon resin is selected from one or more of nylon 6 and nylon 66. Preferably, the nylon resin is selected from nylon 6.

[0068] In some embodiments, the oil absorption value of the conductive carbon black is 100 mL / 100 g to 200 mL / 100 g. As an example, the oil absorption value of the conductive carbon black can be 100 mL / 100 g, 110 mL / 100 g, 120 mL / 100 g, 130 mL / 100 g, 140 mL / 100 g, 150 mL / 100 g, 160 mL / 100 g, 170 mL / 100 g, 180 mL / 100 g, 190 mL / 100 g, or 200 mL / 100 g; further, the oil absorption value of the conductive carbon black can be any value within the range formed by any two of the above point values as the end values. Further, the oil absorption value of the conductive carbon black is 120 mL / 100 g to 150 mL / 100 g.

[0069] On the one hand, for conductive carbon black with a high oil absorption value, its aggregate structure is more complex and the porosity is higher. In polymer matrix composites, conductive carbon black with a high oil absorption value can adsorb more oil substances, making it easier to form an interconnected conductive network in the polymer matrix. These conductive networks provide more paths for charge conduction, enabling the charges on the surface and inside of the material to dissipate quickly, thereby effectively reducing the surface resistance of the material and significantly improving the antistatic performance of the polymer matrix composite. On the other hand, when the oil absorption value of the conductive carbon black is within a suitable range, the conductive carbon black has a good interfacial bond with the polymer matrix, can be evenly dispersed in the matrix, and plays a role in strengthening and toughening, improving the tensile strength and impact toughness of the composite material.

[0070] In some embodiments, the linear density of the long glass fiber is 700 tex to 3600 tex. As an example, the linear density of the long glass fiber can be 700 tex, 800 tex, 900 tex, 1200 tex, 1500 tex, 2000 tex, 2200 tex, 2500 tex, 2800 tex, 3000 tex, 3200 tex, 3500 tex, or 3600 tex; further, the linear density of the long glass fiber can be any value within the range formed by any two of the above point values as the end values. Further, the linear density of the long glass fiber can be 1800 tex to 2400 tex. By controlling the linear density of the long glass fiber, that is, controlling the thickness of the long glass fiber, and controlling the thickness of the long glass fiber within the above range, the dispersibility of the long glass fiber in the nylon matrix composite can be improved, and further the strengthening and toughening effect on the composite material can be improved.

[0071] In some embodiments, the long glass fiber is an E-glass fiber.

[0072] In some embodiments, the toughening agent is selected from one or more of polyvinyl alcohol, maleic anhydride grafted polyolefin elastomer (MAH-g-POE), maleic anhydride grafted polypropylene (MAH-g-PP), and maleic anhydride grafted ethylene-propylene-diene monomer rubber (MAH-g-EPDM).

[0073] In some embodiments, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 168, antioxidant 3114, antioxidant 619, and antioxidant DSTP. Preferably, the antioxidant is selected from antioxidant 1010 and antioxidant 168.

[0074] In one embodiment of the present application, a method for preparing the above antistatic nylon-based composite material is provided, including the following steps S10 to S20.

[0075] S10. Mix and melt nylon resin, antioxidant, toughening agent, and conductive carbon black according to the mass fraction ratio to obtain a mixed melt.

[0076] S20. Immerse long glass fibers in the above mixed melt and form to obtain an antistatic nylon-based composite material.

[0077] In some embodiments, before mixing and melting nylon resin, antioxidant, toughening agent, and conductive carbon black according to the mass fraction ratio, the nylon resin needs to be dried in a vacuum drying oven at 100°C to 110°C for 5 to 8 hours.

[0078] In some embodiments, the above step S10 can be carried out in an extruder.

[0079] In some embodiments, the barrel temperature in the extruder is set to 120°C to 275°C.

[0080] In some embodiments, in the above step S20, when immersing long glass fibers in the mixed melt, the temperature of the mixed melt is maintained at 230°C to 265°C.

[0081] In some embodiments, the above step S20 can be carried out in an impregnation mold.

[0082] In some embodiments, the above forming includes the following steps:

[0083] After immersing long glass fibers in the above mixed melt, the long glass fibers in the mold are pulled out of the mold, cooled, and pelletized to obtain an antistatic nylon-based composite material.

[0084] In some embodiments, the pulling speed is 8 m / min to 20 m / min.

[0085] In some embodiments, the length of the pellets obtained after pelletizing is 8 mm to 11 mm.

[0086] In an embodiment of the present application, a polymer product is provided, and the raw materials for preparing the polymer product include the above antistatic nylon-based composite material.

[0087] In some embodiments, the polymer product includes, but is not limited to, electronic device housings, pipes, valves, and the like.

[0088] In order to make the objectives, technical solutions, and advantages of the present invention more concise and clear, the present invention is described by the following specific embodiments. However, the present invention is by no means limited to these embodiments. The following described embodiments are only preferred embodiments of the present invention and can be used to describe the present invention, and should not be construed as a limitation on the scope of the present invention. It should be noted that any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

[0089] To better illustrate the present invention, the content of the present invention will be further described below in conjunction with embodiments. The following are specific embodiments.

[0090] The information of each component used in the embodiments and comparative examples of the present application is as follows:

[0091] Nylon resin: PA6, product model is M2400, and the relative viscosity is 2.4.

[0092] Antioxidant: Antioxidant 1010, Antioxidant 168.

[0093] Toughening agent: 5001.

[0094] Conductive carbon black 1: Specific surface area is 100, and oil absorption value is 100.

[0095] Conductive carbon black 2: Specific surface area is 150, and oil absorption value is 150.

[0096] Conductive carbon black 3: Specific surface area is 80, and oil absorption value is 40.

[0097] Long glass fiber 1: E-glass fiber, linear density is 1200.

[0098] Long glass fiber 2: E-glass fiber, linear density is 2400.

[0099] Example 1

[0100] (1) Weigh the raw materials according to the formula shown in Table 1 and set aside.

[0101] (2) Dry the nylon resin in a vacuum drying oven at 110 °C for 6 hours, and then mix it evenly with the toughening agent, antioxidant, and conductive carbon black according to the mass percentage.

[0102] (3) Connect the impregnation device to the twin-screw extruder, and add the uniformly mixed material from step (2) into the twin-screw extruder for melt blending. Extrude the mixed melt into the cavity of the impregnation die. Among them, between the feed inlet and the extrusion outlet of the twin-screw extruder, there are nine barrel sections, and the temperatures of each barrel section are as follows: 120°C, 220°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C, 230°C.

[0103] (4) After a large amount of melt enters the cavity of the impregnation die, place the long glass fibers into the cavity of the impregnation die. The temperature in the cavity of the impregnation die is 230°C - 260°C. Under the action of tension, the long glass fibers are fully dispersed and impregnated in the mixed melt; the long glass fibers after melt impregnation are pulled out of the die at a rate of 20 m / min, and are granulated after cooling to obtain strip-shaped pellets with a length of 10 ± 0.2 mm. The above products are dried in a blast drying oven at 95°C for 5 hours and then injection molded into standard specimens and standard light plates (150 * 100 * 3.2 mm) using a plastic injection molding machine, with an injection temperature of 240°C. The injection-molded specimens and light plates are immediately placed in a glass desiccator and left at room temperature for at least 24 hours before performance testing.

[0104] Examples 2 - 7, Comparative Examples 1 - 4

[0105] The preparation methods of Examples 2 - 7 and Comparative Examples 1 - 4 are basically the same as those of Example 1, except that the formulations of the nylon-based composites are different. The formulations of each example and comparative example are shown in Table 1 below.

[0106] Product performance testing methods:

[0107] Notched impact strength: Tested according to the method specified in ISO 179-1, specimen size: 80 * 10 * 4 mm.

[0108] Surface resistance: Tested according to the method specified in IEC 60093, using specimens with a diameter of 80 mm and a thickness of 3 mm.

[0109] Tensile properties: Tested according to the method specified in ISO 527, with a tensile speed of 5 mm / min.

[0110] Flexural properties: Tested according to the method specified in ISO 178, with a test speed of 2 mm / min.

[0111] The performance test results of the nylon-based composites in each example and comparative example of this application are shown in Tables 1 and 2.

[0112] Table 1

[0113]

[0114] Table 2

[0115]

[0116] As shown in Table 1, the surface resistance of the nylon-based composite materials prepared by the technical solutions of Examples 1 to 7 of the present application is 10 2 Ω to 10 4 Ω. It can be seen that the nylon-based composite materials prepared by the technical solutions of the present application have good antistatic effects (in the art, when the surface resistance of a plastic product is below 10 12 Ω, it can be considered that the plastic product has certain antistatic performance).

[0117] Combining the data in Table 1 and Table 2, in Comparative Example 1 when preparing the nylon-based composite material, no conductive carbon black component was added, and the surface resistance of the nylon-based composite material prepared was 10 13 Ω, and it has no antistatic effect. At the same time, by comparing the tensile strength, flexural strength, and flexural modulus of Examples 1 to 7 with Comparative Example 1, it can be found that the nylon-based composite material prepared in Comparative Example 1 is inferior to Examples 1 to 7 in the above performances. It can be seen that the addition of conductive carbon black further improves the mechanical strength of the nylon-based composite material.

[0118] Compared with Example 3, in Comparative Example 2, the component of the toughening agent was significantly increased, and the mechanical strength of the nylon-based composite material prepared was inferior to that of Example 3, indicating that through the reasonable ratio of each component in the present application, the mechanical strength and toughness of the antistatic nylon-based composite material are improved at the same time.

[0119] Compared with Example 3, in Comparative Example 3, short glass fibers were used to replace long glass fibers, and the comprehensive performance of the nylon-based composite material prepared was poor.

[0120] Compared with Example 3, in Comparative Example 4, the specific surface area of the conductive carbon black used was 250 m 2 / g, which is not within the scope of the present application, and the performance of the nylon-based composite material prepared is poor.

[0121] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0122] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims, and the specification can be used to explain the content of the claims.

Claims

1. An antistatic nylon-based composite material, characterized in that: Calculated by mass, it includes the following components: 40~70 parts of nylon resin, 0.5~1 part of antioxidant, 1~5 parts of toughening agent, Conductive carbon black 10~25 parts, 15~40 parts of long glass fiber; The length of the long glass fiber is 8 mm to 12 mm; the specific surface area of ​​the conductive carbon black is 50 m 2 / g~200m 2 / g.

2. The antistatic nylon-based composite material according to claim 1, characterized in that: Calculated by mass, it includes the following components: 40~60 parts of nylon resin, 0.5~0.8 parts of antioxidants, 4~5 parts of toughening agent, Conductive carbon black 10~20 parts, and 18~35 parts of long glass fiber.

3. The antistatic nylon-based composite material according to any one of claims 1 to 2, characterized in that: The conductive carbon black has an oil absorption value of 100 mL / 100 g to 200 mL / 100 g.

4. The antistatic nylon-based composite material according to any one of claims 1 to 2, characterized in that: The antistatic nylon-based composite material meets at least one of the following conditions: (1) The linear density of the long glass fiber is 700 tex to 3600 tex; (2) The long glass fiber is alkali-free glass fiber.

5. The antistatic nylon-based composite material according to any one of claims 1 to 2, characterized in that: The relative viscosity of the nylon resin is 1.8-2.

8.

6. The antistatic nylon-based composite material according to claim 5, characterized in that: The nylon resin is selected from one or more of nylon 6 and nylon 66.

7. The antistatic nylon-based composite material according to any one of claims 1 to 2 and 6, characterized in that: The toughening agent is selected from one or more of polyvinyl alcohol, maleic anhydride grafted polyolefin elastomer, maleic anhydride grafted polypropylene and maleic anhydride grafted ethylene propylene diene monomer rubber.

8. The antistatic nylon-based composite material according to any one of claims 1 to 2 and 6, characterized in that: The antioxidant is selected from one or more of antioxidant 1010, antioxidant 168, antioxidant 3114, antioxidant 619 and antioxidant DSTP.

9. The method for preparing the antistatic nylon-based composite material according to any one of claims 1 to 8, characterized in that: The steps include: Mixing and melting the nylon resin, the antioxidant, the toughening agent and the conductive carbon black according to a mass ratio to obtain a mixed melt; The long glass fibers are impregnated into the mixed melt and molded to obtain the antistatic nylon-based composite material.

10. A polymer product, characterized in that The raw materials for preparing the polymer product include the antistatic nylon-based composite material as described in any one of claims 1 to 8.

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