Polypropylene-based antistatic bulk continuous filament and process for its preparation

Abstract

The application provides a polypropylene-based antistatic bulk filament, which is formed by mixing, spinning, oiling and drawing deformation of polypropylene-based antistatic masterbatch and pure PP material in sequence; wherein the polypropylene-based antistatic masterbatch addition amount is 8-25% of the weight of the pure PP material; the preparation raw materials of the polypropylene-based antistatic masterbatch include 80-100 parts of polypropylene, 15-30 parts of conductive whisker, 1-6 parts of graphene, 5-10 parts of conductive polymer and 5-12 parts of coupling agent by weight; the application compounding conductive whisker, graphene and conductive polymer improves the antistatic capacity of the filament, so that the filament can be used in light-colored fabric; and by optimizing the relative content of solid conductive material and organic material, the filament has excellent mechanical properties and processing flow properties on the basis of ensuring the antistatic performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of functional fiber manufacturing technology, D01F9 / 00, and in particular to a polypropylene-based antistatic bulk filament and a preparation process thereof. BACKGROUND

[0002] Polypropylene is used as a general-purpose plastic due to its good physical, chemical, mechanical properties and processing properties, and is widely used in the textile field. However, polypropylene has high electrical insulation performance, and the volume resistivity is about 10 16 -10 20 Ω·cm, and static electricity is easily accumulated during processing, which not only causes damage to equipment but also causes serious accidents. For example, in the medical field, static electricity on surgical gowns can cause bacteria and dust to be attracted, and can cause electric shock accidents; in the electronic industry, static electricity can cause damage to integrated circuits and have adverse effects on equipment; in a dusty working environment, clothing friction static electricity can easily cause dust explosions and the like. How to enhance the electrical conductivity of polypropylene-based filaments has been extensively studied.

[0003] At present, the introduction of graphene can significantly improve the antistatic performance of polypropylene-based materials, but graphene itself has a deep color, which will affect the dyeability and color fastness when it is used in filaments, greatly limiting the application of these filaments. Moreover, graphene is difficult to disperse and has poor compatibility with polypropylene, which significantly reduces the mechanical properties of polypropylene-based filaments and increases the difficulty of the spinning process.

[0004] Chinese patent CN105602103 A discloses a graphene-containing antistatic polypropylene material and a preparation method thereof, in which the surface of graphene is modified by using a silane coupling agent to improve the dispersion of graphene in polypropylene. Chinese patent CN109897278 A discloses a preparation method of a graphene-modified polypropylene masterbatch, in which a solution-melt composite method is used to modify polypropylene with graphene, and the dispersion effect is enhanced by twice dispersion of graphene in the polypropylene matrix. The prepared masterbatch can improve the mechanical strength of polypropylene. However, in the above methods, the addition amount of polypropylene is large, the prepared material has a deep color, and the electrical conductivity and mechanical properties of the polypropylene-based material still need to be improved.

[0005] Therefore, it is of great significance to prepare a polypropylene-based bulk filament that is easy to dye, has good antistatic performance, excellent mechanical properties, and good processing performance. SUMMARY

[0006] To solve the above technical problems, the application first provides a polypropylene-based antistatic bulk filament, which is formed by polypropylene-based antistatic masterbatch and pure PP material through mixing, spinning, oiling and drawing deformation in sequence; wherein the polypropylene-based antistatic masterbatch is added in an amount of 8-25% by weight of the pure PP material.

[0007] Further, the raw materials for preparing the polypropylene-based antistatic masterbatch include, by weight parts, 80-100 parts of polypropylene, 15-30 parts of conductive whisker, 1-6 parts of graphene, 5-10 parts of conductive polymer and 5-12 parts of coupling agent.

[0008] Further, the number average molecular weight of the polypropylene is 50-200 thousand, more preferably 50-100 thousand.

[0009] Further, the conductive whisker is selected from at least one of magnesium sulfate whisker, potassium titanate whisker, zinc oxide whisker, titanium dioxide whisker and silicon dioxide whisker.

[0010] Further, the conductive polymer is selected from at least one of polyaniline, polypyrrole and polythiophene, preferably polyaniline.

[0011] Further, the mass ratio of the graphene, conductive whisker and polyaniline is (2-4):(20-25):(5-10).

[0012] In a preferred embodiment, the mass ratio of the graphene, conductive whisker and polyaniline is 3:22:8.

[0013] Preferably, the conductive whisker includes zinc oxide whisker and potassium titanate whisker, and the weight ratio of the two is (1-4):1.

[0014] The unique two-dimensional layered structure of graphene makes it have good electrical conductivity, but its addition into the fiber formula can deepen the color of the fiber and its fabric, limiting the application of the fiber in light-colored fabrics, and its own stability is poor and easy to agglomerate, so the addition amount cannot be too much; zinc oxide whiskers have a special four-needle three-dimensional spatial structure, so that the four protruding needle-shaped crystal parts can effectively contact the needle tip parts of adjacent whiskers, forming a good three-dimensional conductive network, which helps to form a conductive path of the fiber, and itself is colorless and transparent, low in cost, and together with potassium titanate whiskers as the main conductive matrix material of the application, but when the amount is too high, the interaction between adjacent whiskers enhances the four-needle structure and it is easy to be damaged into a single needle, and even cause the needle structure to crack, reducing the conductivity; the introduction of organic materials can reduce the addition amount of inorganic conductive fillers to a certain extent and improve the compatibility in the fiber system, but the long molecular chain of polyaniline itself and the interaction between the inorganic conductive materials and the molecular chain of polypropylene in the system, when the addition amount is too high, not only easy to lead to the decline of the system compatibility and the elongation at break, but also affect the construction of the conductive whisker network path, which is not conducive to the improvement of the conductivity.

[0015] Further, the whiteness of the zinc oxide whisker is ≥85%, the length of the needle-shaped body is 10-50 μm, and the root diameter of the needle-shaped body is 0.5-5 μm; preferably, the length of the needle-shaped body of the zinc oxide whisker is 10-15 μm, and the root diameter of the needle-shaped body is 0.5-2 μm.

[0016] Further, the root diameter of the needle-shaped body of the potassium titanate whisker is 0.1-1 μm, and the length of the needle-shaped body is 3-20 μm, preferably, the root diameter of the needle-shaped body of the potassium titanate whisker is 0.2-0.6 μm, and the length of the needle-shaped body is 3-10 μm.

[0017] Further, the coupling agent is selected from an organic silicon coupling agent and / or a titanate coupling agent.

[0018] Further, the organic silicon coupling agent includes but is not limited to at least one of vinyl trimethoxysilane, vinyl triethoxysilane, methyl vinyl dimethoxysilane, methyl vinyl diethoxysilane, vinyl tri(β-methoxyethoxy)silane), γ-aminopropyl trimethoxysilane, γ-aminopropyl triethoxysilane, γ-mercapto triethoxysilane, 3-(methacryloyloxy) propyl trimethoxysilane.

[0019] Further, the titanate coupling agent includes but is not limited to at least one of isopropyl tri(dioctyl pyrophosphato) titanate and bis(dioctyloxy pyrophosphato) ethylene titanate.

[0020] Further preferably, the coupling agent is an organic silicon coupling agent, specifically γ-aminopropyl triethoxysilane and 3-(methacryloyloxy)propyl trimethoxysilane, with a weight ratio of (1.5-2.5):1.

[0021] Further, the raw materials of the polypropylene-based antistatic masterbatch further include maleic anhydride grafted ethylene-octene copolymer, and the amount of the maleic anhydride grafted ethylene-octene copolymer accounts for 5-25% of the weight of the polypropylene. The maleic anhydride grafted ethylene-octene copolymer is used as one of the media for connecting the polypropylene and the conductive filler in the material in the present application, so as to improve the compatibility of the system and further enhance the mechanical properties of the fiber; the elastic molecular chain segment of the ethylene-octene copolymer can enhance the tensile property of the system and offset the influence of the introduction of the conductive filler on the mechanical properties of the system; in addition, the maleic anhydride grafted on the molecular chain can increase the stability of the conductive filler in the system and inhibit the agglomeration of the conductive filler through the conjugation effect, electrostatic force and other forces; however, the amount of the maleic anhydride grafted ethylene-octene copolymer needs to be strictly controlled to prevent the maleic anhydride grafted ethylene-octene copolymer from having too strong interaction with the polypropylene, the organic conductive polymer and the coupling agent, which would otherwise adversely affect the fluidity and processability of the system and further reduce the mechanical strength of the fiber.

[0022] Further, the raw materials of the polypropylene-based antistatic masterbatch further include 1-5 parts by weight of a lubricant and 1-3 parts by weight of an antioxidant.

[0023] Further, the lubricant includes an external lubricant and an internal lubricant; the external lubricant is at least one of microcrystalline paraffin wax, solid paraffin wax, polyethylene wax, stearate, silicone powder; and the internal lubricant is at least one of stearic amide, oleic amide, N,N-ethylene bis stearic amide, pentaerythritol stearate, fatty acid.

[0024] In one embodiment, the lubricant includes polyethylene wax and N,N-ethylene bis stearic amide.

[0025] Further, the antioxidant is at least one of a hindered phenolic antioxidant, a phosphite antioxidant, an amine antioxidant, a thio acid ester antioxidant, and preferably includes a hindered phenolic antioxidant.

[0026] Further, the preparation method of the polypropylene-based antistatic masterbatch is as follows:

[0027] (1) graphene is added to an organic solvent to obtain a graphene dispersion liquid by ultrasonic dispersion; meanwhile, polypropylene is heated and dissolved in xylene, and then the graphene dispersion liquid is added to the polypropylene solution, and the temperature is continuously increased to 140-160℃ for 1-2h, and then the temperature is decreased to 65-85℃ for drying, to obtain graphene / polypropylene preform;

[0028] (2) the graphene / polypropylene preform and the remaining raw materials are mixed and then fed into a screw extruder for melt extrusion, cooling and granulation.

[0029] Further, the concentration of the graphene dispersion liquid is 1-2.5 g / L, and the organic solvent includes but is not limited to at least one of ethanol, isopropanol, propanol, and water.

[0030] Further, the mass ratio of the polypropylene and xylene is 1:(12-20).

[0031] Further, in the step (2), the extrusion temperature of the screw extruder is 225-245℃. The addition of the conductive filler and the force between the conductive filler and the organic material in the present application will cause the processing difficulty of the fiber system, and when the whiskers and graphene are unevenly dispersed, agglomeration is easily caused, a large number of stress concentration areas are formed in the fiber, and the relative friction between the whiskers in the processing increases the risk of fracture of the whisker structure, which will all lead to the decrease of the mechanical properties and electrical conductivity of the fiber. The composite material has good sensitivity to temperature, and when the extrusion temperature is set to 225-245℃, the special action strength and relative activity between the materials can be ensured, so that the electrical conductivity and mechanical properties of the fiber are at the best value.

[0032] Secondly, the present application also provides a preparation process of the polypropylene-based antistatic bulk filament, which specifically comprises:

[0033] S1, melting: after mixing the polypropylene-based antistatic master batch and pure PP material, the mixture is subjected to screw melting extrusion, and the melting temperature is 225-245℃;

[0034] S2, spinning: the melt in S1 is extruded from a spinneret plate, and the spinning speed is 10-80 m / min;

[0035] S3, cooling: the filament is slowly cooled by side blowing, the side blowing temperature is 20-25℃, the humidity is 65-85%, and the wind speed is 0.6-1.0 m / s;

[0036] S4, oiling: the cooled filament is oiled, and the oiling rate is 0.5-2%;

[0037] S5, stretch deformation: in the stretch deformation, the first hot rod speed is 620-780 m / min, the temperature is 50±5℃, the second hot rod speed is 640-850 m / min, the temperature is 85±5℃, the drafting roller speed is 2200-2800 m / min, the drafting roller temperature is 120-130℃, and the hot deformation temperature is 140-160℃;

[0038] S6, winding into a cylinder.

[0039] Further, the pore diameter of the spinneret plate is 0.25-0.5 mm, the aspect ratio is 0.9-2.0, and the number of spinneret plate holes is 72-300 holes.

[0040] Preferably, the spinning speed in S2 is 30-50 m / min.

[0041] Further, the tanker speed in S4 is 35-55 r / min, and the oiling rate is 0.7-1.1%.

[0042] Further, in the first heat rod speed in S5 stretching deformation is 620-700 m / min, the temperature is 50±5℃, the second heat rod speed is 640-800 m / min, and the temperature is 85±5℃.

[0043] Further, the first adjusting roller and the second adjusting roller speed in S6 is 1850-2350 m / min, and the winding speed is 1870-2400 m / min.

[0044] Further, the polypropylene-based antistatic bulk filament can be used to prepare a bulk yarn.

[0045] Advantages

[0046] 1. The present application uses different kinds of conductive materials by compounding, which not only improves the conductive performance and antistatic ability of the filament, but also reduces the influence of conductive materials on the dyeing of the filament, so that the filament can be used in light-colored fabrics, and the relative content of the conductive material is optimized in the present application, which improves the mechanical properties of the filament on the basis of ensuring the antistatic performance of the filament;

[0047] 2. The present application optimally uses maleic anhydride grafted ethylene-octene copolymer and different kinds of coupling agents to wrap and disperse the solid conductive material, act as a medium connecting polypropylene and solid conductive material, improve the compatibility of the polypropylene-based system and the dispersion uniformity and stability of the conductive material, further improve the mechanical properties and antistatic ability of the filament, and additionally adjust the use amount to improve the processing flow performance of the system;

[0048] 3. The present application optimizes the preparation process and spinning process of the material, and cooperates with the preparation raw material of the filament to make the prepared expanded filament have excellent mechanical properties and stable antistatic ability. DETAILED DESCRIPTION

[0049] EMBODIMENT

[0050] EMBODIMENT 1

[0051] The present embodiment provides a polypropylene-based antistatic bulk filament, and the preparation process comprises:

[0052] S1, melting: 20 parts by weight of polypropylene-based antistatic masterbatch and 100 parts by weight of pure PP material are mixed and then extruded by a screw, and the melting temperature is 230℃.

[0053] S2, spinning: the melt in S1 is extruded from a spinneret with a pore size of 0.305 mm, a length-diameter ratio of 1.8, and 120 spinneret holes; the spinning speed is 45.6 m / min;

[0054] S3, cooling: the filament is slowly cooled by side blowing, the side blowing temperature is 22℃, the humidity is 70%, and the wind speed is 0.85 m / s;

[0055] S4, oiling: the cooled filament is oiled by using German BCF oil agent, the oil wheel speed is 40 r / min, and the oiling rate is 0.9%;

[0056] S5, stretch deformation: in the stretch deformation, the first hot rod speed is 660 m / min, the temperature is 50℃, the second hot rod speed is 670 m / min, the temperature is 85℃, the drafting roller speed is 2500 m / min, the drafting roller temperature is 125℃, and the thermal deformation temperature is 150℃;

[0057] S6, winding: the first adjusting roller speed is 2260 m / min, the second adjusting roller speed is 2280 m / min, and the winding speed is 2300 m / min.

[0058] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 100 parts of polypropylene, 18 parts of maleic anhydride grafted ethylene-octene copolymer, 22 parts of conductive whisker, 4 parts of graphene, 9 parts of polyaniline, 10 parts of coupling agent, 4 parts of lubricant, and 3 parts of antioxidant 1010;

[0059] The number average molecular weight of the polypropylene is 80,000, the conductive whisker is zinc oxide whisker and potassium titanate whisker, the weight ratio is 2:1, the whiteness of the zinc oxide whisker is ≥85%, the length of the needle-shaped body is 12 μm, and the diameter of the needle-shaped body at the root is 1.2 μm; the diameter of the needle-shaped body at the root of the potassium titanate whisker is 0.4 μm, and the length of the needle-shaped body is 5 μm; the coupling agent is γ-aminopropyl triethoxysilane and 3-(methacryloyloxy)propyl trimethoxysilane, the weight ratio is 2.2:1; the lubricant is polyethylene wax and N,N-ethylene bis-stearamide in a weight ratio of 1:1.

[0060] Example 2

[0061] The embodiment provides a polypropylene-based antistatic bulk filament, and the preparation process includes:

[0062] S1, melting: 25 parts by weight of polypropylene-based antistatic master batch and 100 parts by weight of pure PP material are mixed and then extruded by a screw, and the melting temperature is 225℃;

[0063] S2, spinning: the melt in S1 is extruded from a spinneret with a hole diameter of 0.45 mm, a length-diameter ratio of 1.8, and 96 spinneret holes, at a spinning speed of 48.2 m / min;

[0064] S3, cooling: the filaments are slowly cooled by side blowing, with a side blowing temperature of 25℃, a humidity of 65%, and a wind speed of 0.9 m / s;

[0065] S4, oiling: the cooled filaments are oiled, with an oil wheel speed of 35 r / min, and an oiling rate of 1.1%;

[0066] S5, drawing deformation: in the drawing deformation, the first hot rod speed is 780 m / min, the temperature is 55℃, the second hot rod speed is 800 m / min, the temperature is 90℃, the drafting roller speed is 2800 m / min, the drafting roller temperature is 130℃, and the deformation temperature is 160℃;

[0067] S6, winding: the first adjusting roller speed is 2330 m / min, the second adjusting roller speed is 2350 m / min, and the winding speed is 2400 m / min.

[0068] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 90 parts of polypropylene, 22.5 parts of maleic anhydride grafted ethylene-octene copolymer, 15 parts of conductive whisker, 1 part of graphene, 10 parts of polyaniline, 5 parts of coupling agent, 1 part of lubricant, and 1 part of antioxidant 1010.

[0069] The number average molecular weight of the polypropylene is 100,000, the conductive whisker is zinc oxide whisker and potassium titanate whisker, with a weight ratio of 4:1, the whiteness of the zinc oxide whisker is ≥85%, the length of the needle-shaped body is 12 μm, and the diameter of the needle-shaped body at the root is 1.2 μm; the diameter of the needle-shaped body at the root of the potassium titanate whisker is 0.4 μm, and the length of the needle-shaped body is 5 μm; the coupling agent is γ-aminopropyl triethoxysilane and 3-(methacryloyloxy)propyl trimethoxysilane, with a weight ratio of 2.5:1; and the lubricant is polyethylene wax and N,N-ethylene bis-stearamide in a weight ratio of 1:1.

[0070] Example 3

[0071] The present embodiment provides a polypropylene-based antistatic bulk filament, and the preparation process includes:

[0072] S1, melting: 8 parts by weight of polypropylene-based antistatic master batch and 100 parts by weight of pure PP material are mixed and then extruded by a screw, with a melting temperature of 245℃;

[0073] S2, spinning: the melt in S1 is extruded from a spinneret with a hole diameter of 0.35 mm, a length-diameter ratio of 1.6, and 144 spinneret holes, at a spinning speed of 42.2 m / min;

[0074] S3, cooling: the filament body is slowly cooled by side blowing, the temperature of the side blowing is 20℃, the humidity is 85%, and the wind speed is 0.95m / s;

[0075] S4, oiling: the cooled filament body is oiled, the oil wheel speed is 55r / min, and the oiling rate is 0.92%;

[0076] S5, stretch deformation: in the stretch deformation, the first hot rod speed is 620m / min, the temperature is 50℃, the second hot rod speed is 640m / min, the temperature is 85℃, the drafting roller speed is 2200m / min, the drafting roller temperature is 120℃, and the thermal deformation temperature is 140℃;

[0077] S6, winding: the first adjusting roller speed is 1850m / min, the second adjusting roller speed is 1860m / min, and the winding speed is 1870m / min.

[0078] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 80 parts of polypropylene, 8 parts of maleic anhydride grafted ethylene-octene copolymer, 30 parts of conductive whisker, 6 parts of graphene, 5 parts of polyaniline, 12 parts of coupling agent, 5 parts of lubricant, and 3 parts of antioxidant 1010.

[0079] The number average molecular weight of the polypropylene is 80,000, the conductive whisker is zinc oxide whisker and potassium titanate whisker, the weight ratio is 1:1, the whiteness of the zinc oxide whisker is ≥85%, the length of the needle-shaped body is 12μm, and the diameter of the needle-shaped body root is 1.2μm; the diameter of the needle-shaped body root of the potassium titanate whisker is 0.4μm, and the length of the needle-shaped body is 5μm; the coupling agent is γ-aminopropyl triethoxysilane and 3-(methacryloyloxy) propyl trimethoxysilane, the weight ratio is 1.5:1; the lubricant is 1:1 by weight of polyethylene wax and N,N-ethylene bis stearamide.

[0080] Comparative Example 1

[0081] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 80 parts of polypropylene, 8 parts of maleic anhydride grafted ethylene-octene copolymer, 30 parts of conductive whisker, 6 parts of graphene, 5 parts of polyaniline, 12 parts of coupling agent, 5 parts of lubricant, and 3 parts of antioxidant 1010.

[0082] Comparative Example 2

[0083] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 80 parts of polypropylene, 8 parts of maleic anhydride grafted ethylene-octene copolymer, 30 parts of conductive whisker, 6 parts of graphene, 5 parts of polyaniline, 12 parts of coupling agent, 5 parts of lubricant, and 3 parts of antioxidant 1010.

[0084] Comparative Example 3

[0085] The preparation raw materials of the polypropylene-based antistatic master batch include, by weight parts: 80 parts of polypropylene, 8 parts of maleic anhydride grafted ethylene-octene copolymer, 30 parts of conductive whisker, 6 parts of graphene, 5 parts of polyaniline, 12 parts of coupling agent, 5 parts of lubricant, and 3 parts of antioxidant 1010.

[0086] Comparative Example 4

[0087] The raw materials for preparing the polypropylene-based antistatic masterbatch by weight parts include: 100 parts of polypropylene, 18 parts of maleic anhydride grafted ethylene-octene copolymer, 12 parts of conductive whisker, 14 parts of graphene, 9 parts of polyaniline, 10 parts of coupling agent, 4 parts of lubricant, and 3 parts of antioxidant 1010

[0088] Comparative Example 5

[0089] The raw materials for preparing the polypropylene-based antistatic masterbatch by weight parts include: 100 parts of polypropylene, 18 parts of maleic anhydride grafted ethylene-octene copolymer, 12 parts of conductive whisker, 14 parts of graphene, 9 parts of polyaniline, 10 parts of coupling agent, 4 parts of lubricant, and 3 parts of antioxidant 1010

[0090] The preparation method of the polypropylene-based antistatic masterbatch in the above examples is as follows:

[0091] (1) The graphene was added into ethanol and ultrasonically dispersed to obtain a graphene dispersion liquid of 1.5 g / L; at the same time, the polypropylene was heated and dissolved in xylene at a mass ratio of 1:15, the heating temperature was 130°C, after complete dissolution, the graphene dispersion liquid was added, and the temperature was continuously increased to 150°C and stirred for 1 h, and then dried at 80°C to obtain graphene / polypropylene preform;

[0092] (2) The graphene / polypropylene preform and maleic anhydride grafted ethylene-octene copolymer, conductive whisker, polyaniline, coupling agent, lubricant, and antioxidant were mixed and then fed into a screw extruder for melt extrusion, the extrusion temperature was 240°C, and then cooled and pelletized.

[0093] Performance test method:

[0094] 1. Yarn color value: The Lab value of the yarn was tested using a German datacolor-600TM computer color tester, and the larger the L value in the table represents the lighter the yarn color; on the contrary, it represents the darker the yarn color;

[0095] 2. Antistatic property: The surface resistance of the fiber was tested according to the standard GB / T1410-2006;

[0096] 3. Breaking strength: The elongation at break was tested according to the standard GB / T14344-2008.

[0097] The test results are shown in Table 1.

[0098] Table 1

[0099]

Claims

1. A polypropylene-based antistatic bulk continuous filament characterized in that, The bulked filament is formed by polypropylene-based antistatic masterbatch and pure PP after mixing, melting spinning, cooling, oiling, drawing deformation and winding; wherein, the polypropylene-based antistatic masterbatch addition amount is 8-25% of the weight of pure PP material; The preparation raw materials of the polypropylene-based antistatic masterbatch include, by weight parts, 80-100 parts of polypropylene, 15-30 parts of conductive whisker, 1-6 parts of graphene, 5-10 parts of conductive polymer, 5-12 parts of coupling agent, 1-5 parts of lubricant and 1-3 parts of antioxidant; The raw materials of the polypropylene-based antistatic masterbatch also include maleic anhydride grafted ethylene-octene copolymer, and the amount is 5-25% of the weight of polypropylene; The conductive whisker includes zinc oxide whisker and potassium titanate whisker, and the weight ratio of the two is (1-4):1; the whiteness of the zinc oxide whisker is ≥85%, the length of the needle-like body is 10-15 μm, and the diameter of the needle-like body root is 0.5-2 μm; the diameter of the needle-like body root of the potassium titanate whisker is 0.2-0.6 μm, and the length of the needle-like body is 3-10 μm; The conductive polymer is polyaniline; The mass ratio of the graphene, conductive whisker and polyaniline is (2-4):(20-25):(5-10); The coupling agent is γ-aminopropyl triethoxysilane and 3-(methacryloyloxy) propyl trimethoxysilane, and the weight ratio is (1.5-2.5):

1.

2. The process for preparing filaments according to claim 1, characterized in that, Specifically includes: S1, melting: after mixing the polypropylene-based antistatic masterbatch and pure PP material, melt extruding by screw, and the melting temperature is 225-245℃; S2, spinning: extruding the melt in S1 from the spinneret, and the spinning speed is 10-80 m / min; S3, cooling: slowly cooling the filament body by side blowing, and the side blowing temperature is 20-25℃, the humidity is 65-85%, and the wind speed is 0.6-1.0 m / s; S4, oiling: oiling the cooled filament body, and the oiling rate is 0.5-2%; S5, drawing deformation: in the drawing deformation, the first hot roll speed is 620-780 m / min, the temperature is 50±5℃, the second hot roll speed is 640-850 m / min, the temperature is 85±5℃, the drafting roller speed is 2200-2800 m / min, the drafting roller temperature is 120-130℃, and the hot deformation temperature is 140-160℃; S6, winding into a cylinder.

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