Antistatic biaxially oriented nylon film

Abstract

The invention relates to an antistatic biaxially oriented nylon film, which comprises 65-70 parts of copolymer nylon, 10-15 parts of polyamide MXD6, 5-8 parts of functional polyamide, 5-8 parts of N, N-dimethylformamide, 1-3 parts of an antistatic agent, and 1-3 parts of an antioxidant. The antistatic agent comprises the following components in parts by weight: 1-3 parts of 3-[N, N-bis (2-ethoxyl)-2-aminoethanesulfonic acid, 0.5-0.8 part of phosphorus pentoxide, 0.3-0.5 part of polyphosphoric acid, 4-6 parts of ionic liquid modified carboxylated multiwalled carbon nanotubes, 5-8 parts of a permanent antistatic additive, 0.5-1 part of a nucleating agent, 0.3-0.5 part of a coupling agent, 0.3-0.8 part of an antioxidant, 0.3-0.7 part of an anti-blocking agent, 0.5-1 part of a slipping agent, 1-3 parts of 1-allyl-3-vinyl imidazole chlorine salt and 1-3 parts of 3-[N, N-bis (2-ethoxyl)-2-aminoethanesulfonic acid. And 0.8 to 1.2 parts of N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt. The film is good in mechanical property, remarkable in antistatic effect and excellent in barrier property and weather resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of film materials, and particularly to an antistatic biaxially oriented nylon film. Background Art

[0002] Biaxially oriented nylon film (BOPA) is widely used in the fields of food, medicine and electronic packaging due to its high tensile strength, puncture resistance and barrier properties. However, nylon itself is an insulating material with a high surface resistivity, and it is easy to accumulate static electricity during processing or use, resulting in problems such as dust adsorption, fire ignition, interference with the performance of electronic components or discharge damage to precision components, which greatly limits the application of biaxially oriented nylon film in high-end fields.

[0003] Currently, to solve the antistatic problem of biaxially oriented nylon film, the common method is to add or surface coat antistatic agents. However, traditional antistatic agents have poor dispersibility in nylon film, and are prone to phenomena such as migration and precipitation, resulting in unstable and difficult-to-maintain antistatic effects. In addition, the addition of some antistatic agents will also have a negative impact on the mechanical properties and barrier properties of nylon film, making the comprehensive performance of the film material unable to meet the actual application requirements. In addition, the coating formed by surface coating is easy to wear and fall off, and the antistatic performance is also difficult to maintain, making it difficult to meet the requirements of high-end application scenarios.

[0004] To solve the above problems, the Chinese invention patent with the authorization announcement number of CN109808270B discloses a flame-retardant antistatic nylon film and its preparation method. The flame-retardant antistatic nylon film successively includes an upper surface layer, a middle layer and a lower surface layer; an antistatic agent coating is coated on at least one surface of the upper surface layer and the lower surface layer; wherein, by mass percentage, the upper surface layer includes 62%-84% nylon, 1%-18% additives, 15%-20% flame-retardant masterbatch; the core layer includes 47%-69% nylon, 1%-18% additives, 30%-35% flame-retardant masterbatch; the lower surface layer includes 62%-84% nylon, 1%-18% additives, 15%-20% flame-retardant masterbatch. The flame-retardant antistatic nylon film provided by the invention can introduce an antistatic coating into the biaxially oriented nylon film, and use the flame-retardant masterbatch as the upper and lower surface layers, so that the biaxially oriented nylon film product can have excellent antistatic effects on the basis of ensuring good flame-retardant performance, can meet the production packaging use, and has important practical application value. However, the barrier properties, weather resistance and antistatic stability of this nylon film still need to be further improved.

[0005] It can be seen that developing an antistatic biaxially oriented nylon film with good mechanical properties, significant antistatic effects, excellent barrier properties and weather resistance meets the market demand, has broad market value and application prospects, and is of great significance for promoting the development of the biaxially oriented nylon film field. Summary of the Invention

[0006] The main object of the present invention is to provide an antistatic biaxially stretched nylon film with good mechanical properties, remarkable antistatic effect, excellent barrier properties and weather resistance.

[0007] To achieve the above object, the present invention provides an antistatic biaxially stretched nylon film, which is made of the following raw materials by weight: 65 - 70 parts of copolyamide nylon, 10 - 15 parts of polyamide MXD6, 5 - 8 parts of functional polyamide, 1 - 3 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.5 - 0.8 part of phosphorus pentoxide, 0.3 - 0.5 part of polyphosphoric acid, 4 - 6 parts of ionic liquid-modified carboxylated multi-walled carbon nanotubes, 5 - 8 parts of permanent antistatic additive, 0.5 - 1 part of nucleating agent, 0.3 - 0.5 part of coupling agent, 0.3 - 0.8 part of antioxidant, 0.3 - 0.7 part of anti-blocking agent, 0.5 - 1 part of slip agent, 1 - 3 parts of 1-allyl-3-vinylimidazolium chloride, 0.8 - 1.2 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is prepared by a condensation polymerization reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid in a head-to-tail connection.

[0008] Preferably, the copolyamide nylon is UBE NYLON®5033B PA6 / 66.

[0009] Preferably, the polyamide MXD6 is Nylon-MXD6 S6007.

[0010] Preferably, the preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent and mixing evenly to obtain a mixed material, then adding the mixed material into a reaction kettle, replacing the air in the kettle with an inert gas, reacting at 120 - 130 °C for 1 - 3 hours under normal pressure, then raising the temperature to 235 - 255 °C, carrying out a polycondensation reaction at 200 - 600 Pa for 18 - 22 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product with ethanol 3 - 6 times, and then drying in a vacuum drying oven at 85 - 95 °C to constant weight to obtain the functional polyamide.

[0011] Preferably, the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, catalyst, and high-boiling solvent is 1:1:(0.8 - 1.2):(9 - 16).

[0012] Preferably, the catalyst is a mixture of thiophosphonate, phosphorous acid, and phosphorothioamide in a mass ratio of 1:1:(0.8 - 1.2); the high-boiling solvent is dimethyl sulfoxide; the inert gas is any one of nitrogen, helium, neon, and argon.

[0013] Preferably, the method for preparing the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding the carboxylated multi-walled carbon nanotubes and the ionic liquid into water, stirring and reacting at 50 - 70 °C for 5 - 8 h, and then centrifugally washing with water 3 - 6 times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes.

[0014] Preferably, the ionic liquid is at least one of 1-butyl-3-methylimidazolium chloride and 1-butylpyridinium chloride.

[0015] Preferably, the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid, and water is (3 - 5):1:(15 - 25).

[0016] Preferably, the inner diameter of the carboxylated multi-walled carbon nanotubes is 5 - 12 nm, the outer diameter is 30 - 50 nm, the length < 10 μm; the surface carboxyl content > 0.7%.

[0017] Preferably, the permanent antistatic additive is Pebax® MH1657.

[0018] Preferably, the nucleating agent is nano-talc powder with a particle size of 50 - 100 nm.

[0019] Preferably, the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0020] Preferably, the antioxidant is at least one of antioxidant SEED, antioxidant 1010, and antioxidant 168.

[0021] Preferably, the anti-adhesive is at least one of silica, talc powder, and calcium carbonate.

[0022] Preferably, the particle size of the anti-adhesive is 1200 - 1800 mesh.

[0023] Preferably, the slip agent is at least one of erucamide and oleamide.

[0024] Another object of the present invention is to provide a method for preparing the antistatic biaxially oriented nylon film, comprising the following steps: Step S1: Mix co-polyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent and slip agent by weight, and then obtain a composite material. Extrude, cast and form the composite material through a twin-screw extruder in sequence to form a sheet. Step S2: Stretch the above sheet through a biaxial stretching process to form a nylon film. Step S3: Irradiate the nylon film under an electron beam, and then place the irradiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt and ammonium ferrous sulfate. Replace the air with nitrogen, then carry out a heating reaction. After taking it out, wash it with water 3-6 times, and then dry it to obtain an antistatic biaxially stretched nylon film.

[0025] Preferably, in step S1, the extrusion temperature of the twin-screw extruder is 250-270 °C, and the screw speed is 180-250 rpm; in step S2, the biaxial stretching process is specifically: the stretching temperature is 110-120 °C, the stretching rate is 110-80 mm / s, the heat setting temperature is 180-200 °C, and the stretching ratio is 3:1.

[0026] Preferably, the irradiation in step S3 is carried out in an air atmosphere at room temperature, which is continuous electron beam irradiation, the absorption dose is 80-360 kGy, the beam current is 15-95 mA, and the voltage is 200-450 kV.

[0027] Preferably, the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate in step S3 is 1:(0.001-0.003); the reaction temperature of the heating reaction is 60-75 °C, and the time is 4-8 h.

[0028] Due to the application of the above technical solutions, the present invention has the following beneficial effects: (1) The preparation method of the antistatic biaxially stretched nylon film disclosed by the present invention has a simple process, convenient operation control, low dependence on equipment, high preparation efficiency and high finished product qualification rate, is suitable for large-scale industrial production, and has high popularization and application value.

[0029] (2)The antistatic biaxially oriented nylon film disclosed by the present invention is made of the following raw materials by weight: 65-70 parts of copolyamide nylon, 10-15 parts of polyamide MXD6, 5-8 parts of functional polyamide, 1-3 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.5-0.8 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 4-6 parts of ionic liquid-modified carboxylated multi-walled carbon nanotubes, 5-8 parts of permanent antistatic additive, 0.5-1 part of nucleating agent, 0.3-0.5 part of coupling agent, 0.3-0.8 part of antioxidant, 0.3-0.7 part of antiblocking agent, 0.5-1 part of slip agent, 1-3 parts of 1-allyl-3-vinylimidazolium chloride, 0.8-1.2 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; through the mutual cooperation and joint action of each raw material, the product can be given excellent mechanical properties, antistatic properties, barrier properties and weather resistance.

[0030] (3)In the antistatic biaxially oriented nylon film disclosed by the present invention, the functional polyamide is prepared by a polycondensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end. At the same time, phenylphenazine, triazine, amide and ionic salt structures are introduced. Under the multiple effects of electronic effect, steric effect and conjugation effect, etc., in cooperation with other raw materials, the prepared product has a remarkable antistatic effect, and more excellent mechanical properties, barrier properties and weather resistance.

[0031] (4)The antistatic biaxially oriented nylon film disclosed by the present invention. The addition of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid can enhance the compatibility between raw materials, improve the interfacial interaction, and enhance the antistatic effect; by means of the benzene ring structure of the functional polyamide and MXD6, the interfacial bonding force is enhanced, achieving long-term and stable antistatic performance and breaking through the bottleneck of the easy fracture of the conductive network in the prior art; the addition of ion liquid-modified carboxylated multi-walled carbon nanotubes can effectively improve the antistatic performance and mechanical properties; the ion liquid has good ionic conductivity, and after being modified on the carboxylated multi-walled carbon nanotubes, it can form a conductive network in the nylon matrix. When added to the antistatic nylon, these conductive networks can effectively conduct charges, reduce the electrostatic accumulation on the material surface, thereby significantly improving the antistatic performance of the nylon and enabling it to meet various application scenarios with high requirements for static electricity control. After being modified by the ion liquid, the compatibility with the nylon matrix is improved. The multi-walled carbon nanotubes themselves have high strength and modulus, and their addition to nylon can play a reinforcing role. There is better interfacial bonding between the ion liquid-modified carboxylated multi-walled carbon nanotubes and the nylon matrix, which can more effectively transfer the external force to the carbon nanotubes, so that while improving the antistatic performance, the mechanical properties of the nylon can also be improved to a certain extent; the structure formed by the ion liquid-modified carboxylated multi-walled carbon nanotubes is relatively stable and is not prone to falling off or decomposing during the processing and use of the nylon film. This enables the performance of the antistatic nylon film to remain relatively stable during long-term use and under different environmental conditions, reducing the risk of a decrease in antistatic performance due to the failure of additives.

[0032] (5)The antistatic biaxially oriented nylon film disclosed by the present invention forms an interpenetrating network structure on the film surface through electron beam radiation grafting, which can effectively improve the comprehensive performance and performance stability of the base film. At the same time, the introduced imidazole chloride salt and zwitterionic salt structures cooperate with other antistatic active components in the film to effectively improve the antistatic performance. Detailed implementation mode

[0033] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. Example 1

[0034] An antistatic biaxially stretched nylon film is made from the following raw materials by weight: 65 parts of copolyamide nylon, 10 parts of polyamide MXD6, 5 parts of functional polyamide, 1 part of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.5 part of phosphorus pentoxide, 0.3 part of polyphosphoric acid, 4 parts of ionic liquid modified carboxylated multi-walled carbon nanotubes, 5 parts of permanent antistatic additive, 0.5 part of nucleating agent, 0.3 part of coupling agent, 0.3 part of antioxidant, 0.3 part of antiblocking agent, 0.5 part of slip agent, 1 part of 1-allyl-3-vinylimidazolium chloride, 0.8 part of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is made by the polycondensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end; the copolyamide nylon is UBE NYLON®5033BPA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

[0035] The preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent and mixing evenly to obtain a mixed material, then adding the mixed material into a reaction kettle, replacing the air in the kettle with an inert gas, reacting at 120 °C for 1 hour under normal pressure, then heating to 235 °C, carrying out a polycondensation reaction at 200 Pa for 18 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product with ethanol 3 times, and then drying in a vacuum drying oven at 85 °C to constant weight to obtain the functional polyamide; the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:0.8:9; the catalyst is a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:1:0.8; the high-boiling solvent is dimethyl sulfoxide; the inert gas is nitrogen. Through GPC testing, the M n of this polyamide is 13808 g / mol, and M W / M n = 1.452; through elemental quantitative analysis and weight change calculation, it is confirmed that the molar ratio of the structural units introduced by 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid in this functional polyamide is 1:1.

[0036] The preparation method of the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding carboxylated multi-walled carbon nanotubes and an ionic liquid into water, stirring and reacting at 50 °C for 5 h, then centrifugally washing with water three times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes; the ionic liquid is 1-butyl-3-methylimidazolium chloride; the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid and water is 3:1:15; the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length is <10 μm; the surface carboxyl content is >0.7%.

[0037] The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 50 nm; the coupling agent is silane coupling agent KH550; the antioxidant is antioxidant SEED; the anti-blocking agent is silica; the particle size of the anti-blocking agent is 1200 mesh; the slip agent is erucamide.

[0038] A preparation method of the antistatic biaxially oriented nylon film comprises the following steps: Step S1: Mixing copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent and slip agent evenly by weight to obtain a composite material, and extruding, casting and forming the composite material through a twin-screw extruder in sequence to form a sheet; Step S2: Stretching the above sheet by a biaxial stretching process to form a nylon film; Step S3: Radiating the nylon film under an electron beam, then placing the radiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt and ammonium ferrous sulfate, displacing the air with nitrogen, then carrying out a heating reaction, taking it out, washing it three times with water, and then drying it to obtain the antistatic biaxially oriented nylon film.

[0039] In step S1, the extrusion temperature of the twin-screw extruder is 250 °C and the screw speed is 180 rpm; in step S2, the biaxial stretching process is specifically: the stretching temperature is 110 °C, the stretching rate is 110 mm / s, the heat setting temperature is 180 °C, and the stretching ratio is 3:1.

[0040] The radiation in step S3 is carried out in an air atmosphere at room temperature, is continuous electron beam radiation, the absorption dose is 80 kGy, the beam current is 15 mA, and the voltage is 200 kV.

[0041] In step S3, the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:0.001; the reaction temperature of the heating reaction is 60°C and the time is 4 h. Example 2

[0042] An antistatic biaxially oriented nylon film is made from the following raw materials by weight: 67 parts of copolyamide nylon, 12 parts of polyamide MXD6, 6 parts of functional polyamide, 1.5 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.6 parts of phosphorus pentoxide, 0.35 parts of polyphosphoric acid, 4.5 parts of ionic liquid-modified carboxylated multi-walled carbon nanotubes, 6 parts of permanent antistatic additive, 0.6 parts of nucleating agent, 0.35 parts of coupling agent, 0.4 parts of antioxidant, 0.4 parts of anti-blocking agent, 0.6 parts of slip agent, 1.5 parts of 1-allyl-3-vinylimidazolium chloride, 0.9 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is made by a polycondensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end; the copolyamide nylon is UBE NYLON®5033B PA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

[0043] The preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst to a high-boiling solvent and mixing evenly to obtain a mixed material, then adding the mixed material to a reaction kettle, displacing the air in the kettle with an inert gas, reacting at 123°C for 1.5 hours under normal pressure, then raising the temperature to 240°C, carrying out a polycondensation reaction at 300 Pa for 19 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product 4 times with ethanol, and then drying in a vacuum drying oven at 87°C to constant weight to obtain the functional polyamide; the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:0.9:11; the catalyst is a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:1:0.9; the high-boiling solvent is dimethyl sulfoxide; the inert gas is helium.

[0044] The preparation method of the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding the carboxylated multi-walled carbon nanotubes and the ionic liquid into water, stirring and reacting at 55 °C for 6 h, then centrifugally washing with water 4 times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes; the ionic liquid is 1-butylpyridinium chloride; the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid and water is 3.5:1:17; the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length is <10 μm; the surface carboxyl content is >0.7%.

[0045] The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 60 nm; the coupling agent is silane coupling agent KH560; the antioxidant is antioxidant 1010; the anti-blocking agent is talc powder; the particle size of the anti-blocking agent is 1400 mesh; the slip agent is oleic acid amide.

[0046] A preparation method of the antistatic biaxially oriented nylon film comprises the following steps: Step S1: Mixing copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent and slip agent evenly by weight to obtain a composite material, and extruding, casting and sheet-forming the composite material through a twin-screw extruder in sequence to form a sheet; Step S2: Stretching the above sheet by a biaxial stretching process to form a nylon film; Step S3: Irradiating the nylon film under an electron beam, then placing the irradiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt and ammonium ferrous sulfate, displacing the air with nitrogen, then carrying out a heating reaction, taking it out, washing 4 times with water, and then drying to obtain the antistatic biaxially oriented nylon film.

[0047] In step S1, the extrusion temperature of the twin-screw extruder is 255 °C and the screw rotation speed is 210 rpm; in step S2, the biaxial stretching process is specifically: the stretching temperature is 113 °C, the stretching rate is 100 mm / s, the heat setting temperature is 185 °C, and the stretching ratio is 3:1; in step S3, the irradiation is carried out in an air atmosphere at room temperature, which is continuous electron beam irradiation, the absorption dose is 160 kGy, the beam current is 35 mA, and the voltage is 250 kV; the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:0.0015; the reaction temperature of the heating reaction is 64 °C and the time is 5 h. Example 3

[0048] An antistatic biaxially oriented nylon film is made from the following raw materials by weight: 68 parts of copolyamide nylon, 13 parts of polyamide MXD6, 6.5 parts of functional polyamide, 2 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.65 parts of phosphorus pentoxide, 0.4 parts of polyphosphoric acid, 5 parts of ionic liquid-modified carboxylated multi-walled carbon nanotubes, 6.5 parts of permanent antistatic additive, 0.8 parts of nucleating agent, 0.4 parts of coupling agent, 0.6 parts of antioxidant, 0.5 parts of anti-blocking agent, 0.8 parts of slip agent, 2 parts of 1-allyl-3-vinylimidazolium chloride, and 1 part of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is made by a polycondensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end; the copolyamide nylon is UBE NYLON®5033BPA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

[0049] The preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent, mixing evenly to obtain a mixed material, then adding the mixed material into a reaction kettle, replacing the air in the kettle with an inert gas, reacting at 125°C for 2 hours under normal pressure, then heating up to 245°C, carrying out a polycondensation reaction at 400 Pa for 20 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product 5 times with ethanol, and then drying in a vacuum drying oven at 90°C to constant weight to obtain the functional polyamide; the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:1:12; the catalyst is a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:1:1; the high-boiling solvent is dimethyl sulfoxide; the inert gas is neon.

[0050] The preparation method of the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding the carboxylated multi-walled carbon nanotubes and the ionic liquid into water, stirring and reacting at 60 °C for 6.5 h, then centrifuging and washing with water 5 times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes; the ionic liquid is 1-butyl-3-methylimidazolium chloride; the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid and water is 4:1:20; the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length is <10 μm; the surface carboxyl content is >0.7%.

[0051] The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 80 nm; the coupling agent is silane coupling agent KH570; the antioxidant is antioxidant 168; the anti-blocking agent is calcium carbonate; the particle size of the anti-blocking agent is 1600 mesh; the slip agent is erucamide.

[0052] A preparation method of the antistatic biaxially oriented nylon film comprises the following steps: Step S1: Mixing the copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent and slip agent evenly by weight to obtain a composite material, and successively extruding, casting and calendaring the composite material through a twin-screw extruder to form a sheet; Step S2: Stretching the above sheet through a biaxial stretching process to form a nylon film; Step S3: Radiating the nylon film under an electron beam, then placing the radiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt and ammonium ferrous sulfate, displacing the air with nitrogen, then carrying out a heating reaction, taking it out, washing with water 5 times, and then drying to obtain the antistatic biaxially oriented nylon film.

[0053] In step S1, the extrusion temperature of the twin-screw extruder is 260 °C and the screw speed is 220 rpm; in step S2, the biaxial stretching process is specifically: the stretching temperature is 115 °C, the stretching rate is 95 mm / s, the heat setting temperature is 190 °C, and the stretching ratio is 3:1; in step S3, the radiation is carried out in an air atmosphere at room temperature, which is continuous electron beam radiation, the absorption dose is 260 kGy, the beam current is 70 mA, and the voltage is 350 kV; the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:0.002; the reaction temperature of the heating reaction is 68 °C and the time is 6 h. Example 4

[0054] An antistatic biaxially oriented nylon film is made from the following raw materials by weight: 69 parts of copolyamide nylon, 14 parts of polyamide MXD6, 7.5 parts of functional polyamide, 2.5 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.75 part of phosphorus pentoxide, 0.45 part of polyphosphoric acid, 5.5 parts of ionic liquid modified carboxylated multi-walled carbon nanotubes, 7.5 parts of permanent antistatic additive, 0.9 part of nucleating agent, 0.45 part of coupling agent, 0.7 part of antioxidant, 0.6 part of anti-blocking agent, 0.9 part of slip agent, 2.5 parts of 1-allyl-3-vinylimidazolium chloride, 1.1 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is made by a condensation polymerization reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end; the copolyamide nylon is UBENYLON®5033B PA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

[0055] The preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent, mixing evenly to obtain a mixed material, then adding the mixed material into a reaction kettle, replacing the air in the kettle with an inert gas, reacting at 128°C for 2.5 hours under normal pressure, then heating to 250°C, carrying out a polycondensation reaction at 500 Pa for 21 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product 6 times with ethanol, and then drying to constant weight in a vacuum drying oven at 93°C to obtain the functional polyamide; the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:1.1:15; the catalyst is a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:1:1.1; the high-boiling solvent is dimethyl sulfoxide; the inert gas is argon.

[0056] The preparation method of the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding the carboxylated multi-walled carbon nanotubes and the ionic liquid into water, stirring and reacting at 65 °C for 7.5 h, then centrifugally washing with water for 6 times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes; the ionic liquid is composed of 1-butyl-3-methylimidazolium chloride and 1-butylpyridinium chloride mixed in a mass ratio of 1:2; the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid and water is 4.5:1:23; the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length is <10 μm; the surface carboxyl content is >0.7%.

[0057] The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 90 nm; the coupling agent is composed of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570 mixed in a mass ratio of 1:1:2; the antioxidant is composed of antioxidant SEED, antioxidant 1010 and antioxidant 168 mixed in a mass ratio of 1:3:5; the anti-blocking agent is composed of silica, talc powder and calcium carbonate mixed in a mass ratio of 2:1:1; the particle size of the anti-blocking agent is 1700 mesh; the slip agent is composed of erucic acid amide and oleic acid amide mixed in a mass ratio of 3:5.

[0058] A preparation method of the antistatic biaxially oriented nylon film comprises the following steps: Step S1: uniformly mixing copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent and slip agent by weight to obtain a composite material, and successively extruding, casting and forming the composite material through a twin-screw extruder to form a sheet; Step S2: stretching the above sheet by a biaxial stretching process to form a nylon film; Step S3: irradiating the nylon film under an electron beam, then placing the irradiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt and ammonium ferrous sulfate, displacing the air with nitrogen, then carrying out a heating reaction, taking out and washing with water 6 times, and then drying to obtain the antistatic biaxially oriented nylon film.

[0059] In step S1, the extrusion temperature of the twin-screw extruder is 265 °C and the screw speed is 240 rpm. In step S2, the biaxial stretching process is specifically as follows: the stretching temperature is 118 °C, the stretching rate is 90 mm / s, the heat setting temperature is 195 °C, and the stretching ratio is 3:1. In step S3, the radiation is carried out in an air atmosphere at room temperature, which is continuous electron beam radiation, the absorbed dose is 340 kGy, the beam current is 90 mA, and the voltage is 430 kV. The mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:0.0025. The reaction temperature of the heating reaction is 73 °C and the time is 7.5 h. Example 5

[0060] An antistatic biaxially stretched nylon film is made from the following raw materials by weight: 70 parts of copolyamide, 15 parts of polyamide MXD6, 8 parts of functional polyamide, 3 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.8 part of phosphorus pentoxide, 0.5 part of polyphosphoric acid, 6 parts of ionic liquid-modified carboxylated multi-walled carbon nanotubes, 8 parts of permanent antistatic additive, 1 part of nucleating agent, 0.5 part of coupling agent, 0.8 part of antioxidant, 0.7 part of anti-blocking agent, 1 part of slip agent, 3 parts of 1-allyl-3-vinylimidazolium chloride, 1.2 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the functional polyamide is made by a condensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end; the copolyamide is UBE NYLON®5033B PA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

[0061] The preparation method of the functional polyamide comprises the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent, mixing uniformly to obtain a mixed material, then adding the mixed material into a reaction kettle, displacing the air in the kettle with an inert gas, reacting at 130 °C for 3 hours under normal pressure, then heating to 255 °C, carrying out polycondensation reaction at 600 Pa for 22 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product with ethanol 6 times, and then drying in a vacuum drying oven at 95 °C to constant weight to obtain the functional polyamide; the molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:1.2:16; the catalyst is composed of thiophosphonate, phosphorous acid, and thiophosphoramide mixed according to a mass ratio of 1:1:1.2; the high-boiling solvent is dimethyl sulfoxide; the inert gas is argon.

[0062] The preparation method of the ionic liquid-modified carboxylated multi-walled carbon nanotubes comprises the following steps: adding carboxylated multi-walled carbon nanotubes and an ionic liquid into water, stirring and reacting at 70 °C for 8 h, and then centrifugally washing with water 6 times to obtain the ionic liquid-modified carboxylated multi-walled carbon nanotubes; the ionic liquid is 1-butyl-3-methylimidazolium chloride; the mass ratio of the carboxylated multi-walled carbon nanotubes, the ionic liquid, and water is 5:1:25; the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length < 10 μm; the surface carboxyl content > 0.7%.

[0063] The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 100 nm; the coupling agent is silane coupling agent KH550; the antioxidant is antioxidant SEED; the anti-blocking agent is calcium carbonate; the particle size of the anti-blocking agent is 1800 mesh; the slip agent is erucamide.

[0064] A preparation method of the antistatic biaxially oriented nylon film comprises the following steps: Step S1: Mixing copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent, and slip agent by weight to obtain a composite material, and extruding, casting, and forming the composite material through a twin-screw extruder in sequence to form a sheet; Step S2: Stretching the above sheet through a biaxial stretching process to form a nylon film; Step S3: Radiate the nylon film under an electron beam, then place the radiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt, and ammonium ferrous sulfate. Replace the air with nitrogen, then carry out a heating reaction. After taking it out, wash it 6 times with water and then dry it to obtain an antistatic biaxially stretched nylon film.

[0065] In step S1, the extrusion temperature of the twin-screw extruder is 270 °C and the screw speed is 250 rpm; in step S2, the biaxial stretching process is specifically as follows: the stretching temperature is 120 °C, the stretching rate is 80 mm / s, the heat setting temperature is 200 °C, and the stretching ratio is 3:1; the radiation in step S3 is carried out in an air atmosphere at room temperature, is continuous electron beam radiation, the absorption dose is 360 kGy, the beam current is 95 mA, and the voltage is 450 kV; the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:0.003; the reaction temperature of the heating reaction is 75 °C and the time is 8 h.

[0066] Comparative Example 1 An antistatic biaxially stretched nylon film, which is basically the same as Example 1, except that an equal amount of copolymer nylon is used to replace polyamide MXD6 and 1-allyl-3-vinylimidazolium chloride is not added.

[0067] Comparative Example 2 An antistatic biaxially stretched nylon film, which is basically the same as Example 1, except that an equal amount of copolymer nylon is used to replace the functional polyamide and N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid is not added.

[0068] In order to further illustrate the beneficial technical effects of the antistatic biaxially stretched nylon film involved in each embodiment of the present invention, relevant performance tests were carried out on the antistatic biaxially stretched nylon films involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1, and the test methods are as follows: (1) Tensile properties: Tensile strength test was carried out according to GB / T1040.1-2018; (2) Weather resistance: Place the antistatic biaxially stretched nylon film products of each example in an environment of 85 °C and 85% RH for 1000 hours. After cooling to room temperature, measure the tensile strength again. The weather resistance is measured by the retention rate of the tensile strength. The larger the value, the better the weather resistance; (3) Surface resistance: Test was carried out with reference to GB / T 1410-2006. The surface resistance value of the film was measured using a high resistance meter (model ZC36). The test voltage was 100 V, the test time was 60 s, and the test environment temperature was 23 °C and the humidity was 50%; (4)Water vapor transmission rate test: The test was carried out with reference to GB / T 1037-1988 "Test Method for Water Vapor Transmission of Plastic Films and Sheets - Cup Method", with the test temperature of 38 °C and relative humidity of 90%.

[0069] The thickness of the test sample film was 15 μm.

[0070] Table 1 Performance test results of antistatic biaxially oriented nylon film Project Tensile strength Weather resistance Surface resistance Water vapor transmission rate Unit MPa % <![CDATA[×10 6 Ω]]> g / (m²・24h) Example 1 308 99.43 9.3 0.03 Example 2 312 99.56 8.0 0.01 Example 3 318 99.66 5.4 0 Example 4 320 99.86 3.4 0 Example 5 325 99.97 3.0 0 Comparative example 1 280 98.55 12.2 0.35 Comparative example 2 292 96.32 13.5 0.47 As can be seen from Table 1, the antistatic biaxially oriented nylon film disclosed in the embodiments of the present invention has better mechanical and weather resistance properties than the products of the comparative examples, and also has more excellent antistatic and barrier properties; the combined use of polyamide MXD6, functional polyamide, 1-allyl-3-vinylimidazolium chloride, and N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid is beneficial to improving the above properties.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the principles described in the above embodiments and the specification are only the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An antistatic biaxially oriented nylon film, characterized in that, It is made from the following raw materials by weight: 65 - 70 parts of copolyamide nylon, 10 - 15 parts of polyamide MXD6, 5 - 8 parts of functional polyamide, 1 - 3 parts of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, 0.5 - 0.8 parts of phosphorus pentoxide, 0.3 - 0.5 parts of polyphosphoric acid, 4 - 6 parts of ionic liquid modified carboxylated multi-walled carbon nanotubes, 5 - 8 parts of permanent antistatic additive, 0.5 - 1 part of nucleating agent, 0.3 - 0.5 part of coupling agent, 0.3 - 0.8 part of antioxidant, 0.3 - 0.7 part of anti-blocking agent, 0.5 - 1 part of slip agent, 1 - 3 parts of 1-allyl-3-vinylimidazolium chloride, 0.8 - 1.2 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt; the functional polyamide is made by the polycondensation reaction of 3,7-diamino-5-phenylphenazine chloride and dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid connected end to end.

2. The antistatic biaxially oriented nylon film according to claim 1, wherein The copolyamide nylon is UBENYLON®5033B PA6 / 66; the polyamide MXD6 is Nylon-MXD6 S6007.

3. The antistatic biaxially oriented nylon film according to claim 1, wherein The preparation method of the functional polyamide includes the following steps: adding 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, and a catalyst into a high-boiling solvent, mixing evenly to obtain a mixed material, then adding the mixed material into a reaction kettle, replacing the air in the kettle with an inert gas, reacting at 120 - 130 °C under normal pressure for 1 - 3 hours, then heating to 235 - 255 °C, carrying out a polycondensation reaction at 200 - 600 Pa for 18 - 22 hours, then cooling to room temperature, adjusting to normal pressure, precipitating in water, washing the crude product with ethanol 3 - 6 times, and then drying in a vacuum drying oven at 85 - 95 °C to constant weight to obtain the functional polyamide.

4. The antistatic biaxially oriented nylon film according to claim 3, wherein, The molar ratio of 3,7-diamino-5-phenylphenazine chloride, dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, the catalyst, and the high-boiling solvent is 1:1:(0.8 - 1.2):(9 - 16); the catalyst is a mixture of thiophosphonate, phosphorous acid, and thiophosphoramide in a mass ratio of 1:1:(0.8 - 1.2); the high-boiling solvent is dimethyl sulfoxide; the inert gas is any one of nitrogen, helium, neon, and argon.

5. The antistatic biaxially oriented nylon film according to claim 1, characterized in that The preparation method of the ionic liquid modified carboxylated multi-walled carbon nanotubes includes the following steps: adding carboxylated multi-walled carbon nanotubes and an ionic liquid into water, stirring and reacting at 50 - 70 °C for 5 - 8 h, then centrifugally washing with water 3 - 6 times to obtain the ionic liquid modified carboxylated multi-walled carbon nanotubes.

6. The antistatic biaxially oriented nylon film according to claim 5, characterized in that, The ionic liquid is at least one of 1-butyl-3-methylimidazolium chloride and 1-butylpyridinium chloride; the mass ratio of the carboxylated multi-walled carbon nanotubes, ionic liquid, and water is (3-5):1:(15-25); the inner diameter of the carboxylated multi-walled carbon nanotubes is 5-12 nm, the outer diameter is 30-50 nm, and the length is <10 μm; the surface carboxyl content is >0.7%.

7. The antistatic biaxially oriented nylon film according to claim 1, characterized in that The permanent antistatic additive is Pebax® MH1657; the nucleating agent is nano-talc powder with a particle size of 50-100 nm; the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570; the antioxidant is at least one of antioxidant SEED, antioxidant 1010, and antioxidant 168; the anti-blocking agent is at least one of silica, talc powder, and calcium carbonate; the particle size of the anti-blocking agent is 1200-1800 mesh; the slip agent is at least one of erucic acid amide and oleic acid amide.

8. A method for preparing an antistatic biaxially stretched nylon film according to any one of claims 1-7, characterized in that, It includes the following steps: Step S1: Mix the copolyamide, polyamide MXD6, functional polyamide, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid, phosphorus pentoxide, polyphosphoric acid, ionic liquid-modified carboxylated multi-walled carbon nanotubes, permanent antistatic additive, nucleating agent, coupling agent, antioxidant, anti-blocking agent, and slip agent by weight parts evenly to obtain a composite material, and extrude, cast, and form the composite material through a twin-screw extruder in sequence to form a sheet; Step S2: Stretch the above sheet through a biaxial stretching process to form a nylon film; Step S3: Irradiate the nylon film under an electron beam, then place the irradiated nylon film in a solution containing 1-allyl-3-vinylimidazolium chloride, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt, and ammonium ferrous sulfate, displace the air with nitrogen, then carry out a heating reaction, take it out and wash it with water 3-6 times, and then dry it to obtain an antistatic biaxially stretched nylon film.

9. The preparation method of the antistatic biaxially oriented nylon film according to claim 8, characterized in that, In Step S1, the extrusion temperature of the twin-screw extruder is 250-270 °C, and the screw speed is 180-250 rpm; in Step S2, the specific biaxial stretching process is: the stretching temperature is 110-120 °C, the stretching rate is 110-80 mm / s, the heat setting temperature is 180-200 °C, and the stretching ratio is 3:

1.

10. The preparation method of the antistatic biaxially oriented nylon film according to claim 8, wherein, In Step S3, the irradiation is carried out in an air atmosphere at room temperature, which is continuous electron beam irradiation, the absorption dose is 80-360 kGy, the beam current is 15-95 mA, and the voltage is 200-450 kV; the mass ratio of 1-allyl-3-vinylimidazolium chloride to ammonium ferrous sulfate is 1:(0.001-0.003); the reaction temperature of the heating reaction is 60-75 °C, and the time is 4-8 h.