Permanent antistatic PC composite material and preparation method thereof

Abstract

The invention relates to the field of PC composite materials, and discloses a permanent antistatic PC composite material and a preparation method thereof. The PC composite material prepared by the invention comprises the following raw materials in parts by weight: 40-60 parts of polycarbonate, 15-25 parts of a toughening agent, 7-12 parts of a composite modifier, 3-6 parts of talcum powder, 0.1-0.3 part of an antioxidant and 1-2 parts of a lubricant, the composite material is prepared by taking polycarbonate as a main raw material and adding functional aids such as a flexibilizer and a composite modifier for compounding. The PC composite material disclosed by the invention has excellent permanent antistatic performance and ultraviolet aging resistance.

Description

Technical Field

[0001] The invention relates to the field of PC composite materials, and in particular to a permanent antistatic PC composite material and a preparation method thereof. Background Art

[0002] Polycarbonate (PC), as an important engineering thermoplastic, is widely used in the fields of electronics, automobiles, medical devices, optical devices, consumer electronics and packaging due to its excellent impact toughness, good transparency, high heat resistance and excellent electrical insulation. However, there are still some disadvantages, such as: (1) Due to its excellent electrical insulation, PC materials are very likely to generate and accumulate static charges due to friction during processing and use, resulting in the easy adsorption of dust and pollutants on the surface of the material, production and processing difficulties, operational safety hazards and reduced user experience; (2) PC molecular chains contain benzene rings and ester groups, which are easily induced by photo-oxidation reactions after ultraviolet irradiation, resulting in yellowing, embrittlement and a sharp drop in mechanical properties of the material; these disadvantages limit the application of PC composite materials in the fields of automotive interiors and electronic equipment casings.

[0003] In view of the shortcomings of antistatic performance, the antistatic performance is generally improved by coating the surface of the material with an antistatic agent, but the surface antistatic agent is easy to wear and fail, and the antistatic performance is not long-lasting; adding a permanent antistatic agent for blending, using moisture absorption to reduce the surface resistance of the material to achieve an antistatic effect, the disadvantage is that it is highly dependent on humidity and easily fails at high temperatures. UV resistance is usually achieved by adding small molecule UV absorbers or light stabilizers, but small molecules will migrate in the matrix and the effect is not good. Therefore, based on the above shortcomings, it is necessary to develop a PC composite material that has both UV resistance and permanent antistatic properties to meet practical application needs. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a permanent antistatic PC composite material and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A permanent antistatic PC composite material comprises the following raw materials in parts by weight: 40-60 parts of polycarbonate, 15-25 parts of toughening agent, 7-12 parts of composite modifier, 3-6 parts of talc, 0.1-0.3 parts of antioxidant, and 1-2 parts of lubricant; Further, the toughening agent is one of methyl methacrylate-butadiene-styrene copolymer or ethylene-vinyl acetate copolymer; Further, the antioxidant is one of antioxidant 168, antioxidant 1010 or antioxidant 1076; Further, the lubricant is one of calcium stearate or zinc stearate; The composite modifier is prepared by the following steps: Step A1: Mix stannous chloride pentahydrate and antimony chloride in ethanol and stir evenly to obtain Solution 1; after mixing ammonium bicarbonate and ethanol, add acetic acid and stir evenly to obtain Solution 2; simultaneously drip Solution 1 and Solution 2 into ethanol and stir vigorously for reaction for 2 - 5 h, the reaction temperature is 10 - 15 °C, then age for 0.5 h, filter, freeze-dry, wash, filter, vacuum-dry, and then calcine in a muffle furnace at 450 - 550 °C for 2 h, and grind to obtain antimony tin oxide nanomaterials; Further, in Solution 1 described in Step A1, the dosage ratio of stannous chloride pentahydrate, antimony chloride and ethanol is 10 g:0.3 - 0.5 g:50 mL, and in Solution 2, the dosage ratio of ammonium bicarbonate, ethanol and acetic acid is 12 - 16 g:80 mL:0.5 - 2 mL; Step A2: Disperse the antimony tin oxide nanomaterials evenly in a mixed solution of ethanol and water, adjust the pH to 9.8 - 10.2, add 2,4,6,8 - tetramethylcyclotetrasiloxane and tetraethyl orthosilicate, and raise the temperature to 45 °C for reaction for 2 - 3 h, filter, wash, and dry to obtain PDMS@ATO (polysiloxane@antimony tin oxide nanomaterials); Further, in Step A2, the dosage ratio of antimony tin oxide nanomaterials, ethanol, water, 2,4,6,8 - tetramethylcyclotetrasiloxane and tetraethyl orthosilicate is 5 g:40 mL:20 mL:0.8 - 1.2 g:1 - 1.5 g; Step A3: Mix N - methylimidazole and acetonitrile and stir evenly, and raise the temperature to 50 - 55 °C, add 1,10 - dichlorodecane, and reflux at 80 °C for reaction for 3 - 5 h, and rotary evaporate to obtain imidazole quaternary ammonium salt; Further, in Step A3, the dosage ratio of N - methylimidazole, acetonitrile and 1,10 - dichlorodecane is 0.05 - 0.15 mol:100 mL:0.05 - 0.15 mol; Step A4: Mix 4 - chlorostyrene, half of triethylamine and dichloromethane evenly, slowly add 2,2,6,6 - tetramethylpiperidineamine under ice - water bath and stir continuously, after raising the temperature to room temperature, react for 2 - 3 h, wash and separate the liquid, collect the organic phase, rotary evaporate, collect the intermediate product and redisperse it in acetonitrile, add the remaining triethylamine and imidazole quaternary ammonium salt and stir evenly, react at room temperature for 3 - 4 h, wash with water and separate the liquid, collect the organic phase, and rotary evaporate to obtain the organic modifier; Further, in Step A4, the dosage ratio of 4 - chlorostyrene, triethylamine, dichloromethane, 2,2,6,6 - tetramethylpiperidineamine, acetonitrile and imidazole quaternary ammonium salt is 0.1 - 0.2 mol:0.2 - 0.4 mol:200 mL:0.1 - 0.2 mol:200 mL:0.1 - 0.2 mol; Step A5: Under nitrogen conditions, uniformly mix PDMS@ATO in isopropanol by stirring, add isopropanol solution of chloroplatinic acid, heat up to 80 °C, then add an organic modifier and stir for reaction for 3.5 - 4.5 h, filter, wash, and dry to obtain a composite modifier; Further, in step A5, the dosage ratio of PDMS@ATO, isopropanol, isopropanol solution of chloroplatinic acid, and the organic modifier is 2 - 4 g:50 mL:10 mL:3 - 6 g; Further, in the isopropanol solution of chloroplatinic acid described in step A5, the dosage ratio of chloroplatinic acid and isopropanol is 0.001 - 0.003 g:10 mL.

[0006] A preparation method of a permanent antistatic PC composite material comprises the following steps: Weigh raw materials by weight parts, uniformly mix polycarbonate and the composite modifier in a mixer by stirring, then add a toughening agent, talcum powder, antioxidant, and lubricant and mix uniformly, transfer to a twin-screw extruder, melt extrude, pelletize, cool, and dry to obtain the permanent antistatic PC composite material.

[0007] Advantages of the present invention: The PC composite material prepared by the present invention is mainly prepared from polycarbonate as the main raw material, adding functional aids such as a toughening agent, a composite modifier, talcum powder, and an antioxidant, and has excellent permanent antistatic performance and ultraviolet aging resistance performance.

[0008] The composite modifier prepared by the present invention uses ATO as the substrate, coats a polysiloxane containing active - H on its surface, and then grafts an organic modifier onto the polysiloxane by hydrosilylation reaction. Among them, the organic modifier contains a positively charged imidazole quaternary ammonium salt structure, a hindered amine structure, a benzene ring, and a carbon - carbon double bond structure. ATO as the substrate in the composite modifier is itself an excellent conductive filler. After coating the polysiloxane on its surface, it can improve the compatibility and dispersibility of ATO in the matrix, reduce agglomeration, and form a more uniform conductive network in the matrix. The organic modifier grafted on the surface of ATO can move on the surface and inside of the matrix by using long-chain alkyl groups, so that the terminal imidazole quaternary ammonium cations can form an ionic conductive channel in the matrix and a conductive layer on the surface of the matrix. By using the synergistic effect of the electronic conductivity of ATO and the ionic conductivity of imidazole quaternary ammonium salt, an "electron - ion" dual-channel conductive network is constructed, enabling the matrix to have permanent antistatic performance. In addition, the hindered amine structure and benzene ring contained in the organic modifier can also cooperate with ATO to improve the ultraviolet resistance of the matrix; this is because ATO itself has strong shielding performance against ultraviolet rays, which can reduce the entry of ultraviolet light into the interior of the matrix, and the hindered amine structure can capture free radicals generated by ultraviolet light and inhibit chain decomposition to achieve ultraviolet resistance performance. Specific embodiments

[0009] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0010] Example 1: The composite modifier is prepared by the following steps: Step A1: Mix 10 g of stannous chloride pentahydrate and 0.3 g of antimony chloride evenly in 50 mL of ethanol, and record it as Solution 1; after mixing 12 g of ammonium bicarbonate and 80 mL of ethanol, add 0.5 mL of acetic acid and stir evenly, and record it as Solution 2; simultaneously drip Solution 1 and Solution 2 into 100 mL of ethanol and stir vigorously for reaction for 2 h, the reaction temperature is 10 °C, then age for 0.5 h, filter, freeze-dry, wash, filter, vacuum-dry, and then calcine in a muffle furnace at 450 °C for 2 h, and grind to obtain antimony tin oxide nanomaterials; Step A2: Disperse 5 g of antimony tin oxide nanomaterials evenly in a mixed solution of 40 mL of ethanol and 20 mL of water, adjust the pH to 9.8, add 0.8 g of 2,4,6,8-tetramethylcyclotetrasiloxane and 1 g of tetraethyl orthosilicate, and raise the temperature to 45 °C for reaction for 2 h, filter, wash, and dry to obtain PDMS@ATO; Step A3: Mix 0.05 mol of N-methylimidazole and 100 mL of acetonitrile evenly and heat up to 50 °C, add 0.05 mol of 1,10-dichlorodecane, and reflux at 80 °C for reaction for 3 h, and rotary evaporate to obtain imidazole quaternary ammonium salt; Step A4: Mix 0.1 mol of 4-chlorostyrene, 0.1 mol of triethylamine and 200 mL of dichloromethane evenly, slowly add 0.1 mol of 2,2,6,6-tetramethylpiperidineamine under an ice-water bath, and continuously stir. After raising the temperature to room temperature, react for 2 h, wash and separate the liquid, collect the organic phase, rotary evaporate, collect the intermediate product and redisperse it in 200 mL of acetonitrile, add 0.1 mol of triethylamine and 0.1 mol of imidazole quaternary ammonium salt and stir evenly, react at room temperature for 3 h, wash with water and separate the liquid, collect the organic phase, and rotary evaporate to obtain an organic modifier; Step A5: Under nitrogen conditions, mix 2 g of PDMS@ATO evenly in 50 mL of isopropanol, add 10 mL of chloroplatinic acid isopropanol solution, and raise the temperature to 80 °C, then add 3 g of organic modifier and stir for reaction for 3.5 h, filter, wash, and dry to obtain a composite modifier. The dosage ratio of chloroplatinic acid to isopropanol in the chloroplatinic acid isopropanol solution is 0.001 g:10 mL.

[0011] Example 2: The composite modifier is prepared by the following steps: Step A1: Mix 10 g of stannous chloride pentahydrate and 0.4 g of antimony chloride evenly in 50 mL of ethanol, and label it as Solution 1; after mixing 14 g of ammonium bicarbonate and 80 mL of ethanol, add 1 mL of acetic acid and stir evenly, and label it as Solution 2; simultaneously drip Solution 1 and Solution 2 into 100 mL of ethanol, stir vigorously for reaction for 3.5 h, the reaction temperature is 10 °C, then age for 0.5 h, filter, freeze-dry, wash, filter, vacuum-dry, and then calcine in a muffle furnace at 500 °C for 2 h, and grind to obtain antimony tin oxide nanomaterials; Step A2: Disperse 5 g of antimony tin oxide nanomaterials evenly in a mixed solution of 40 mL of ethanol and 20 mL of water, adjust the pH to 10, add 1 g of 2,4,6,8-tetramethylcyclotetrasiloxane and 1.2 g of tetraethyl orthosilicate, and raise the temperature to 45 °C for reaction for 2.5 h, filter, wash, and dry to obtain PDMS@ATO; Step A3: Mix 0.1 mol of N-methylimidazole and 100 mL of acetonitrile evenly and heat to 55 °C, add 0.1 mol of 1,10-dichlorodecane, and reflux at 80 °C for reaction for 4 h, and rotary evaporate to obtain imidazole quaternary ammonium salt; Step A4: Mix 0.15 mol of 4-chlorostyrene, 0.15 mol of triethylamine and 200 mL of dichloromethane evenly, slowly add 0.15 mol of 2,2,6,6-tetramethylpiperidineamine under an ice-water bath, and continuously stir. After heating to room temperature, react for 2.5 h, wash and separate the liquid, collect the organic phase, rotary evaporate, collect the intermediate product and redisperse it in 200 mL of acetonitrile, add 0.15 mol of triethylamine and 0.15 mol of imidazole quaternary ammonium salt and stir evenly, react at room temperature for 3.5 h, wash with water and separate the liquid, collect the organic phase, and rotary evaporate to obtain the organic modifier; Step A5: Under nitrogen conditions, mix 3 g of PDMS@ATO evenly in 50 mL of isopropanol, add 10 mL of chloroplatinic acid isopropanol solution, and heat to 80 °C, then add 4.5 g of the organic modifier and stir for reaction for 4 h, filter, wash, and dry to obtain the composite modifier. The dosage ratio of chloroplatinic acid to isopropanol in the chloroplatinic acid isopropanol solution is 0.002 g:10 mL.

[0012] Example 3: The composite modifier is prepared by the following steps: Step A1: Mix 10 g of stannous chloride pentahydrate and 0.5 g of antimony chloride evenly in 50 mL of ethanol, and label it as Solution 1; after mixing 16 g of ammonium bicarbonate and 80 mL of ethanol, add 2 mL of acetic acid and stir evenly, and label it as Solution 2; simultaneously drip Solution 1 and Solution 2 into 100 mL of ethanol, stir vigorously for reaction for 5 h, the reaction temperature is 15 °C, then age for 0.5 h, filter, freeze-dry, wash, filter, vacuum-dry, and then place it in a muffle furnace at 550 °C for 2 h, and grind to obtain antimony tin oxide nanomaterials; Step A2: Disperse 5 g of antimony tin oxide nanomaterials evenly in a mixed solution of 40 mL of ethanol and 20 mL of water, adjust the pH to 10.2, add 1.2 g of 2,4,6,8-tetramethylcyclotetrasiloxane and 1.5 g of tetraethyl orthosilicate, and raise the temperature to 45 °C for reaction for 3 h. Filter, wash, and dry to obtain PDMS@ATO; Step A3: Mix 0.15 mol of N-methylimidazole and 100 mL of acetonitrile and stir evenly, then raise the temperature to 55 °C, add 0.15 mol of 1,10-dichlorodecane, and reflux at 80 °C for 5 h. Rotary evaporate to obtain the imidazole quaternary ammonium salt; Step A4: Mix 0.2 mol of 4-chlorostyrene, 0.2 mol of triethylamine, and 200 mL of dichloromethane evenly. Slowly add 0.2 mol of 2,2,6,6-tetramethylpiperidineamine under an ice-water bath and stir continuously. After raising the temperature to room temperature, react for 3 h. Wash and separate the liquid, collect the organic phase, rotary evaporate, collect the intermediate product and redisperse it in 200 mL of acetonitrile. Add 0.2 mol of triethylamine and 0.2 mol of imidazole quaternary ammonium salt and stir evenly. React at room temperature for 4 h. Wash with water and separate the liquid, collect the organic phase, rotary evaporate to obtain the organic modifier; Step A5: Under nitrogen conditions, mix 4 g of PDMS@ATO evenly in 50 mL of isopropanol, add 10 mL of chloroplatinic acid isopropanol solution, and raise the temperature to 80 °C. Then add 6 g of the organic modifier and stir for reaction for 4.5 h. Filter, wash, and dry to obtain the composite modifier. The dosage ratio of chloroplatinic acid to isopropanol in the chloroplatinic acid isopropanol solution is 0.003 g:10 mL.

[0013] Example 4: A method for preparing a permanently antistatic PC composite material includes the following steps: Weigh the raw materials by weight. Mix 40 parts of polycarbonate and 7 parts of the composite modifier prepared in Example 1 evenly in a mixer, then add 15 parts of methyl methacrylate-butadiene-styrene copolymer, 3 parts of talc, 0.1 part of antioxidant 168, and 1 part of calcium stearate and mix evenly. Transfer to a twin-screw extruder, melt extrude, granulate, cool, and dry to obtain the permanently antistatic PC composite material.

[0014] Example 5: A method for preparing a permanently antistatic PC composite material includes the following steps: Weigh the raw materials by weight. Mix 50 parts of polycarbonate and 10 parts of the composite modifier prepared in Example 2 evenly in a mixer, then add 20 parts of ethylene-vinyl acetate copolymer, 4.5 parts of talc, 0.2 part of antioxidant 1010, and 1.5 parts of zinc stearate and mix evenly. Transfer to a twin-screw extruder, melt extrude, granulate, cool, and dry to obtain the permanently antistatic PC composite material.

[0015] Example 6: A preparation method of a permanent antistatic PC composite material comprises the following steps: Weigh the raw materials by weight. Mix 60 parts of polycarbonate and 12 parts of the composite modifier prepared in Example 3 evenly in a mixer, then add 25 parts of methyl methacrylate-butadiene-styrene copolymer, 6 parts of talcum powder, 0.3 part of antioxidant 1076 and 2 parts of zinc stearate and mix evenly. Transfer to a twin-screw extruder, melt extrude, pelletize, cool and dry to obtain the permanent antistatic PC composite material.

[0016] Comparative Example 1: This comparative example is a PC composite material. The difference from Example 6 is that the tin antimonate oxide nanomaterial prepared in Example 3 is used to replace the composite modifier prepared in Example 3, and the rest are the same.

[0017] Comparative Example 2: This comparative example is a PC composite material. The difference from Example 6 is that the PDMS@ATO prepared in Example 3 is used to replace the composite modifier prepared in Example 3, and the rest are the same.

[0018] Comparative Example 3: This comparative example is a PC composite material. The difference from Example 6 is that the organic modifier prepared in Example 3 is used to replace the composite modifier prepared in Example 3, and the rest are the same.

[0019] Comparative Example 4: This comparative example is a PC composite material. The difference from Example 6 is that the polymer permanent antistatic agent with the brand name of Croda U1 is used to replace the composite modifier prepared in Example 3, and the rest are the same.

[0020] Perform performance tests on the PC composite materials prepared in Examples 4-6 and Comparative Examples 1-4: Antistatic performance test: Refer to GB / T 1410-2006 "Test Methods for Volume Resistivity and Surface Resistivity of Solid Insulating Materials" to detect the surface resistivity of the PC composite material; UV aging resistance performance test: Test the tensile strength according to the GB / T 1040-2006 standard, then place it in a UV aging test chamber for aging for 500 h, the aging temperature is 45 °C, and test the tensile strength again; The test results are shown in Table 1: Table 1: Performance test results

[0021] As can be seen from Table 1, after the antistatic performance test of the PC composite material prepared by the present invention, the surface resistivity is in the range of (2.6×10 6 -6.8×10 6)(Ω·cm), indicating that the composite material has excellent antistatic performance; after the ultraviolet aging performance test, the tensile strength decreased from (60.3 - 61.2) MPa before aging to (55.8 - 56.4) MPa after aging, indicating that the composite material has certain ultraviolet aging resistance performance.

[0022] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, as long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A permanent antistatic PC composite material, characterized in that It comprises the following raw materials in parts by weight: 40-60 parts of polycarbonate, 15-25 parts of toughening agent, 7-12 parts of composite modifier, 3-6 parts of talcum powder, 0.1-0.3 part of antioxidant, and 1-2 parts of lubricant; The composite modifier is prepared by reacting PDMS@ATO with an organic modifier. The organic modifier is prepared by reacting 4-chlorostyrene with 2,2,6,6-tetramethylpiperidineamine and then reacting with an imidazole quaternary ammonium salt. The imidazole quaternary ammonium salt is prepared by reacting N-methylimidazole with 1,10-dichlorodecane. PDMS@ATO is prepared by in-situ synthesis on the surface of tin antimony oxide nanomaterials using 2,4,6,8-tetramethylcyclotetrasiloxane and tetraethyl orthosilicate as raw materials. The tin antimony oxide nanomaterials are prepared by a solid-liquid heterogeneous co-precipitation reaction of tin pentachloride pentahydrate and antimony chloride.

2. The permanent antistatic PC composite material according to claim 1, wherein, The composite modifier is prepared by the following steps: Step A1: Mix tin pentachloride pentahydrate and antimony chloride in ethanol and stir evenly to obtain Solution 1; mix ammonium bicarbonate and ethanol, add acetic acid and stir evenly to obtain Solution 2; simultaneously drop Solution 1 and Solution 2 into ethanol and stir vigorously for reaction for 2-5 h, with the reaction temperature being 10-15 °C, then age for 0.5 h, filter, freeze-dry, wash, filter, vacuum-dry, then calcine in a muffle furnace at 450-550 °C for 2 h, and grind to obtain tin antimony oxide nanomaterials; Step A2: Disperse the tin antimony oxide nanomaterials evenly in a mixed solution of ethanol and water, adjust the pH to 9.8-10.2, add 2,4,6,8-tetramethylcyclotetrasiloxane and tetraethyl orthosilicate, and raise the temperature to 45 °C for reaction for 2-3 h, filter, wash, and dry to obtain PDMS@ATO; Step A3: Mix N-methylimidazole and acetonitrile and stir evenly, raise the temperature to 50-55 °C, add 1,10-dichlorodecane, reflux and react at 80 °C for 3-5 h, and rotary evaporate to obtain the imidazole quaternary ammonium salt; Step A4: Mix 4-chlorostyrene, half a portion of triethylamine and dichloromethane evenly, slowly add 2,2,6,6-tetramethylpiperidineamine under an ice-water bath, and continuously stir. After raising the temperature to room temperature, react for 2-3 h, wash, separate the liquid, collect the organic phase, rotary evaporate, collect the intermediate product, redisperse it in acetonitrile, add the remaining triethylamine and imidazole quaternary ammonium salt and stir evenly, react at room temperature for 3-4 h, wash with water, separate the liquid, collect the organic phase, and rotary evaporate to obtain the organic modifier; Step A5: Under nitrogen conditions, mix PDMS@ATO evenly in isopropanol, add a chloroplatinic acid isopropanol solution, raise the temperature to 80 °C, then add the organic modifier and stir for reaction for 3.5-4.5 h, filter, wash, and dry to obtain the composite modifier.

3. The permanent antistatic PC composite material according to claim 2, wherein In Solution 1 in Step A1, the dosage ratio of tin pentachloride pentahydrate, antimony chloride and ethanol is 10 g:0.3-0.5 g:50 mL, and in Solution 2, the dosage ratio of ammonium bicarbonate, ethanol and acetic acid is 12-16 g:80 mL:0.5-2 mL.

4. The permanent antistatic PC composite material according to claim 2, characterized in that, In step A2, the dosage ratio of antimony tin oxide nanomaterial, ethanol, water, 2,4,6,8-tetramethylcyclotetrasiloxane and tetraethyl orthosilicate is 5 g: 40 mL: 20 mL: 0.8 - 1.2 g: 1 - 1.5 g.

5. The permanent antistatic PC composite material according to claim 2, characterized in that, In step A3, the dosage ratio of N-methylimidazole, acetonitrile and 1,10-dichlorodecane is 0.05 - 0.15 mol: 100 mL: 0.05 - 0.15 mol.

6. The permanent antistatic PC composite material according to claim 2, characterized in that, In step A4, the dosage ratio of 4-chlorostyrene, triethylamine, dichloromethane, 2,2,6,6-tetramethylpiperidineamine, acetonitrile and imidazolium quaternary salt is 0.1 - 0.2 mol: 0.2 - 0.4 mol: 200 mL: 0.1 - 0.2 mol: 200 mL: 0.1 - 0.2 mol.

7. The permanent antistatic PC composite material according to claim 2, wherein, In step A5, the dosage ratio of PDMS@ATO, isopropanol, isopropyl alcohol solution of chloroplatinic acid and organic modifier is 2 - 4 g: 50 mL: 10 mL: 3 - 6 g, and the dosage ratio of chloroplatinic acid and isopropyl alcohol in the isopropyl alcohol solution of chloroplatinic acid is 0.001 - 0.003 g: 10 mL.

8. The permanent antistatic PC composite material according to claim 1, characterized in that The toughening agent is one of methyl methacrylate-butadiene-styrene copolymer or ethylene-vinyl acetate copolymer, the antioxidant is one of antioxidant 168, antioxidant 1010 or antioxidant 1076, and the lubricant is one of calcium stearate or zinc stearate.

9. A method for preparing the permanent antistatic PC composite material according to any one of claims 1-8, characterized in that, It includes the following steps: Weigh the raw materials by weight parts. Mix and stir polycarbonate and the composite modifier evenly in a mixer, then add the toughening agent, talcum powder, antioxidant and lubricant and mix evenly. Transfer to a twin-screw extruder, melt extrude, granulate, cool and dry to obtain the permanent antistatic PC composite material.

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