PVC material with electrically conductive properties and method for producing same

Abstract

The application discloses PVC material with conductive performance and a preparation method thereof, and belongs to the technical field of polymer materials. The PVC material provided by the application is prepared from the following raw materials: polyvinyl chloride resin powder, a plasticizer, a stabilizer, calcium carbonate, superconducting carbon black, nano silver powder, nano nickel powder, a composite lubricant, modified magnesium-aluminum hydrotalcite and lanthanum stearate. The preparation method comprises the following steps: step S1, mixing the superconducting carbon black, the nano silver powder and the nano nickel powder to obtain a premix; step S2, mixing the premix, the polyvinyl chloride resin powder, the calcium carbonate, the modified magnesium-aluminum hydrotalcite, the lanthanum stearate, the stabilizer and the composite lubricant, adding the plasticizer, heating, mixing and obtaining a mixture; and step S3, extruding the mixture into a shape, cooling and granulating to obtain the PVC material with conductive performance. The PVC material prepared by the application has excellent conductivity and thermal stability.

Description

Technical Field

[0001] This application belongs to the field of polymer materials technology, specifically relating to a PVC material with conductive properties and its preparation method. Background Technology

[0002] Metal shielding layers are commonly used in wires and cables to suppress electromagnetic interference (EMI) and ensure the stability of signal transmission. However, metal shielding structures suffer from problems such as heavy weight, poor flexibility, susceptibility to corrosion, complex processing, and high cost, making it difficult to meet the current development needs for lightweight and flexible materials. Therefore, non-metallic shielding materials are gradually gaining attention.

[0003] Polyvinyl chloride (PVC), a widely used general-purpose polymer material for wire and cable sheathing and insulation, possesses good flame retardancy, mechanical properties, and processing performance. However, PVC itself is an insulator and cannot directly achieve electromagnetic shielding. Existing technologies typically construct a conductive network by adding conductive fillers to PVC, thereby imparting conductivity to achieve electromagnetic shielding. However, significant shortcomings remain in practical applications: on the one hand, achieving the conductivity required for effective shielding often necessitates a high proportion of conductive fillers, which can easily lead to deterioration of the material's mechanical properties and reduced processing fluidity; on the other hand, most conductive fillers catalyze the dehydrochlorination reaction of PVC during high-temperature processing or long-term use, exacerbating thermal degradation and causing discoloration, embrittlement, or even functional failure. Furthermore, conventional heat stabilizers have poor compatibility with conductive fillers, making it difficult to maintain efficient conductive pathways while improving thermal stability.

[0004] Therefore, there is an urgent need to develop a PVC material with conductive properties and its preparation method, which can significantly improve conductivity while possessing excellent thermal stability. Summary of the Invention

[0005] In view of this, this application provides a conductive PVC material and a method for preparing the same. The conductive PVC material provided by this application can significantly improve conductivity while possessing excellent thermal stability.

[0006] In a first aspect, this application provides a PVC material with conductive properties, the raw material composition of which, by weight, includes: 80-120 parts of polyvinyl chloride resin powder, 50-70 parts of plasticizer, 1-2 parts of stabilizer, 20-30 parts of calcium carbonate, 10-20 parts of superconducting carbon black, 3-7 parts of nano silver powder, 3-7 parts of nano nickel powder, 0.5-1.5 parts of composite lubricant, 2-5 parts of modified magnesium aluminum hydrotalcite, and 0.2-0.5 parts of lanthanum stearate.

[0007] By adopting the above technical solutions, the conductive PVC material provided in this application achieves excellent thermal stability while significantly improving conductivity. Specifically, superconducting carbon black, nano-silver powder, and nano-nickel powder jointly construct a conductive network, giving the material high volumetric conductivity and broadband electromagnetic shielding capability. The modified magnesium aluminum layered double hydroxide (LDH) in this application not only disperses uniformly in the PVC matrix, avoiding disruption of conductive pathways, but also effectively absorbs HCl generated during PVC degradation during processing and use, inhibiting autocatalytic thermal degradation. Lanthanum stearate, together with the stabilizer and modified magnesium aluminum LDH, forms multiple thermal stability barriers, significantly improving the material's thermal stability.

[0008] Furthermore, the plasticizer and composite lubricant in this application ensure good processing fluidity of the highly filled system, while calcium carbonate guarantees mechanical properties. The components of this application work synergistically to obtain a conductive PVC material that combines high electrical conductivity with excellent thermal stability.

[0009] Optionally, the average degree of polymerization of the polyvinyl chloride resin powder is 1000~1300.

[0010] By adopting the above technical solution, this application selects polyvinyl chloride resin powder with an average degree of polymerization of 1000~1300, which corresponds to a longer molecular chain, effectively reducing the thermal degradation initiation point, thereby delaying the deHCl reaction and enhancing thermal stability; at the same time, this polyvinyl chloride resin usually has a loose structure and high porosity, which has excellent adsorption and containment capacity for plasticizers and conductive fillers, which is conducive to the uniform dispersion of fillers, avoids agglomeration and damage to the conductive network, and thus ensures the high conductivity and high thermal stability of the material.

[0011] Optionally, the plasticizer includes at least one of dioctyl phthalate, dioctyl terephthalate, and trioctyl trimellitate.

[0012] By adopting the above technical solution, the plasticizer of this application can not only give PVC good flexibility and processing fluidity, but also promote the uniform dispersion of conductive fillers and synergistically improve the conductivity and thermal stability of the material.

[0013] Optionally, the stabilizer includes at least one of calcium stearate, zinc stearate, and triphenyl phosphite.

[0014] By adopting the above technical solution, the stabilizer of this application can significantly improve thermal stability and effectively protect the conductive network composed of nano-silver, nano-nickel and superconducting carbon black from thermal degradation, thereby improving both the conductivity and thermal stability of the material.

[0015] Optionally, the average particle size of the calcium carbonate is 0.5 μm to 2 μm.

[0016] By adopting the above technical solution, the calcium carbonate with a specific average particle size of this application has good dispersibility, is not easy to agglomerate, and has less adsorption of stabilizers and plasticizers, thus avoiding interference with the formation of conductive networks, thereby contributing to the processing performance and conductivity of the material.

[0017] Optionally, the superconducting carbon black has a DBP oil absorption value of 300 mL / 100g to 400 mL / 100g.

[0018] By adopting the above technical solution, the DBP oil absorption value of the superconducting carbon black in this application ensures that the carbon black has excellent dispersibility and conductivity in the PVC matrix, which helps to enhance its ability to form continuous conductive pathways in the PVC matrix, thereby improving the conductivity of the material. In addition, it avoids excessive adsorption of plasticizers or stabilizers, preventing them from affecting the thermal stability and processing performance of the PVC matrix, thus achieving a good balance between conductivity and thermal stability.

[0019] Optionally, the average particle size of the nano-silver powder is 20nm~50nm, and the average particle size of the nano-nickel powder is 30nm~80nm.

[0020] By adopting the above technical solution, the average particle size range of the nano-silver powder and nano-nickel powder in this application can ensure that the nanoparticles have a high specific surface area and good conductivity, effectively bridging the superconducting carbon black particles to construct a dense three-dimensional conductive network, while avoiding severe agglomeration due to excessively small particle size and a decrease in shielding effectiveness due to excessively large particle size. At the same time, the nanoparticles in this range have good dispersibility in the PVC matrix, are not prone to affecting the processing flowability of the material, and are well compatible with modified magnesium aluminum hydrotalcite, stabilizers, and other components, thereby improving conductivity while maintaining excellent thermal stability.

[0021] Optionally, the composite lubricant includes a first lubricant and a second lubricant in a mass ratio of (1~2):1; the first lubricant is selected from glyceryl stearate or pentaerythritol stearate; the second lubricant is selected from oxidized polyethylene wax or calcium stearate.

[0022] By adopting the above technical solution, the first lubricant and the second lubricant of this application work synergistically in the above ratio, which can effectively alleviate the processing difficulties caused by the high-filling conductive system, and avoid poor plasticization or decline in mechanical properties caused by lubrication imbalance, thereby achieving stable processing of PVC materials.

[0023] Optionally, the weight ratio of the modified magnesium aluminum hydrotalcite to the lanthanum stearate is (6~10):1.

[0024] By adopting the above technical solution, the modified magnesium aluminum layered double hydroxide (MLD) and lanthanum stearate of this application can synergistically improve the thermal stability of the material. Specifically, the modified magnesium aluminum layered double hydroxide absorbs HCl generated from PVC degradation through its layered structure, inhibiting the autocatalytic dechlorination reaction; while lanthanum stearate can replace unstable chlorine atoms on the PVC chain, effectively improving thermal stability. When used in combination within this ratio range, the two can significantly improve the thermal stability of the material without compromising its electrical conductivity.

[0025] Secondly, this application provides a method for preparing the aforementioned conductive PVC material, comprising the following steps:

[0026] Step S1: Mix the superconducting carbon black, nano silver powder and nano nickel powder at a speed of 500 rpm to 800 rpm for 3 min to 5 min to obtain a premix.

[0027] Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 2 min to 3 min, add the plasticizer, heat to 100℃ to 120℃, and mix at 1200 rpm to 1500 rpm for 8 min to 12 min to obtain the mixture.

[0028] Step S3: Extrude the mixture, cool and granulate it to obtain a PVC material with conductive properties.

[0029] By adopting the above technical solution, the preparation method provided in this application effectively ensures the synergistic achievement of conductivity and thermal stability through stepwise mixing and process parameter control. Step S1 initially constructs a highly efficient conductive pathway; step S2 fully plasticizes the PVC and avoids early degradation caused by high temperature; step S3 obtains a dense and stable PVC material while maintaining the integrity of the conductive network. This method is simple in process and easy to operate, and can meet the needs of industrialization.

[0030] Optionally, the modified magnesium aluminum hydrotalcite is a stearic acid-modified magnesium aluminum hydrotalcite coated with polyaniline, and the preparation steps are as follows:

[0031] Step 1: Disperse magnesium aluminum hydrotalcite in deionized water, add stearic acid, stir and react at 70℃~80℃ for 2h~4h, filter, wash and dry to obtain stearic acid modified magnesium aluminum hydrotalcite; wherein, the amount of stearic acid is 5%~15% of the mass of magnesium aluminum hydrotalcite;

[0032] Step 2: Disperse the stearic acid-modified magnesium aluminum layered double hydroxide in a 0.5 mol / L to 1.5 mol / L hydrochloric acid solution, add aniline monomer, stir and adsorb under ice bath conditions for 30 to 60 minutes, slowly add ammonium persulfate aqueous solution at 0 to 5°C, and continue stirring and reacting for 6 to 8 hours; wherein, the molar ratio of aniline to ammonium persulfate is 1:1, and the polyaniline coating amount is 5% to 15% of the mass of magnesium aluminum layered double hydroxide;

[0033] Step 3: Filter by suction, wash with hydrochloric acid solution, deionized water and ethanol in sequence until the filtrate is colorless, and dry under vacuum to obtain the modified magnesium aluminum hydrotalcite.

[0034] By adopting the above technical solution, the polyaniline-coated stearic acid-modified magnesium aluminum hydrotalcite of this application has good dispersibility in PVC matrix and also has electrical conductivity. It can effectively bridge superconducting carbon black and nano-metal particles, further improving the overall conductivity. At the same time, it retains the ability of magnesium aluminum hydrotalcite to absorb HCl and maintains excellent thermal stability, thus achieving a synergistic enhancement of electrical conductivity and thermal stability.

[0035] In summary, the present invention has at least one of the following beneficial technical effects:

[0036] 1. The conductive PVC material provided in this application achieves excellent thermal stability while significantly improving conductivity.

[0037] 2. The preparation method provided in this application is simple and easy to operate. Through stepwise mixing and process parameter control, it effectively ensures the synergistic realization of electrical conductivity and thermal stability. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] The inventors of this application discovered in their research on conductive PVC materials that existing conductive PVC materials often use a high proportion of conductive fillers to improve conductivity, but this leads to deterioration of the material's mechanical properties and poor thermal stability, making it difficult to improve both conductivity and thermal stability at the same time.

[0040] To address the aforementioned problems, this application proposes a PVC material with conductive properties, comprising, by weight, the following raw materials: 80-120 parts polyvinyl chloride resin powder, 50-70 parts plasticizer, 1-2 parts stabilizer, 20-30 parts calcium carbonate, 10-20 parts superconducting carbon black, 3-7 parts nano silver powder, 3-7 parts nano nickel powder, 0.5-1.5 parts composite lubricant, 2-5 parts modified magnesium aluminum hydrotalcite, and 0.2-0.5 parts lanthanum stearate.

[0041] This application also proposes a method for preparing the above-mentioned conductive PVC material, comprising the following steps:

[0042] Step S1: Mix the superconducting carbon black, nano silver powder and nano nickel powder at a speed of 500 rpm to 800 rpm for 3 min to 5 min to obtain a premix.

[0043] Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 2 min to 3 min, add the plasticizer, heat to 100℃ to 120℃, and mix at 1200 rpm to 1500 rpm for 8 min to 12 min to obtain the mixture.

[0044] Step S3: Extrude the mixture, cool and granulate it to obtain a PVC material with conductive properties.

[0045] The solution of this application will be described below with reference to the following specific embodiments. Unless otherwise specified, the raw materials used in the following embodiments are all from commercially available products, and the devices or equipment used are all purchased from conventional market sales channels.

[0046] The preparation steps of the modified magnesium aluminum hydrotalcite used in Examples 1-3 are as follows:

[0047] Step 1: Disperse magnesium aluminum hydrotalcite in deionized water, add stearic acid, stir and react at 75℃ for 3 hours, filter, wash and dry to obtain stearic acid modified magnesium aluminum hydrotalcite; wherein, the amount of stearic acid used is 10% of the mass of magnesium aluminum hydrotalcite;

[0048] Step 2: Disperse stearic acid-modified magnesium aluminum layered double hydroxide in 1 mol / L hydrochloric acid solution, add aniline monomer, stir and adsorb under ice bath for 45 min, slowly add ammonium persulfate aqueous solution at 3℃, and continue stirring and reacting for 7 h; wherein, the molar ratio of aniline to ammonium persulfate is 1:1, and the polyaniline coating amount is 10% of the mass of magnesium aluminum layered double hydroxide;

[0049] Step 3: Filter by suction, wash with hydrochloric acid solution, deionized water and ethanol in sequence until the filtrate is colorless, dry under vacuum to obtain modified magnesium aluminum hydrotalcite.

[0050] Examples 1-3

[0051] Example 1

[0052] This embodiment provides a PVC material with conductive properties, which, by weight, comprises: 120 parts of polyvinyl chloride resin powder, 50 parts of plasticizer, 1 part of stabilizer, 20 parts of calcium carbonate, 10 parts of superconducting carbon black, 7 parts of nano silver powder, 3 parts of nano nickel powder, 1.5 parts of composite lubricant, 2 parts of modified magnesium aluminum hydrotalcite, and 0.2 parts of lanthanum stearate.

[0053] The polyvinyl chloride resin powder has an average degree of polymerization of 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate.

[0054] The average particle size of calcium carbonate is 2 μm; the DBP oil absorption value of superconducting carbon black is 400 mL / 100g; the average particle size of nano silver powder is 20 nm, and the average particle size of nano nickel powder is 30 nm; the composite lubricant is glyceryl stearate and oxidized polyethylene wax in a mass ratio of 1:1.

[0055] The preparation method includes the following steps:

[0056] Step S1: Mix superconducting carbon black, nano silver powder and nano nickel powder at 500 rpm for 5 min to obtain a premix.

[0057] Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 2 minutes, add plasticizer, heat to 100℃, mix at 1500 rpm for 8 minutes to obtain the mixture.

[0058] Step S3: Extrude the mixture into a mold, cool and granulate it to obtain a PVC material with conductive properties.

[0059] Example 2

[0060] This embodiment provides a PVC material with conductive properties, which, by weight, comprises: 100 parts of polyvinyl chloride resin powder, 60 parts of plasticizer, 1.5 parts of stabilizer, 25 parts of calcium carbonate, 15 parts of superconducting carbon black, 5 parts of nano silver powder, 5 parts of nano nickel powder, 1 part of composite lubricant, 3 parts of modified magnesium aluminum hydrotalcite, and 0.3 parts of lanthanum stearate.

[0061] The polyvinyl chloride resin powder has an average degree of polymerization of 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate.

[0062] The average particle size of calcium carbonate is 2 μm; the DBP oil absorption value of superconducting carbon black is 400 mL / 100g; the average particle size of nano silver powder is 20 nm, and the average particle size of nano nickel powder is 30 nm; the composite lubricant is glyceryl stearate and oxidized polyethylene wax in a mass ratio of 1:1.

[0063] The preparation method includes the following steps:

[0064] Step S1: Mix superconducting carbon black, nano silver powder and nano nickel powder at 650 rpm for 4 min to obtain a premix.

[0065] Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 3 minutes, add plasticizer, heat to 110°C, mix at 1300 rpm for 10 minutes to obtain the mixture.

[0066] Step S3: Extrude the mixture into a mold, cool and granulate it to obtain a PVC material with conductive properties.

[0067] Example 3

[0068] This embodiment provides a PVC material with conductive properties, which, by weight, comprises: 80 parts of polyvinyl chloride resin powder, 70 parts of plasticizer, 2 parts of stabilizer, 30 parts of calcium carbonate, 20 parts of superconducting carbon black, 3 parts of nano silver powder, 7 parts of nano nickel powder, 0.5 parts of composite lubricant, 5 parts of modified magnesium aluminum hydrotalcite, and 0.5 parts of lanthanum stearate.

[0069] The polyvinyl chloride resin powder has an average degree of polymerization of 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate.

[0070] The average particle size of calcium carbonate is 2 μm; the DBP oil absorption value of superconducting carbon black is 400 mL / 100g; the average particle size of nano silver powder is 20 nm, and the average particle size of nano nickel powder is 30 nm; the composite lubricant is glyceryl stearate and oxidized polyethylene wax in a mass ratio of 1:1.

[0071] The preparation method includes the following steps:

[0072] Step S1: Mix superconducting carbon black, nano silver powder and nano nickel powder at 800 rpm for 3 minutes to obtain a premix.

[0073] Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 3 minutes, add plasticizer, heat to 120°C, mix at 1200 rpm for 12 minutes to obtain the mixture.

[0074] Step S3: Extrude the mixture into a mold, cool and granulate it to obtain a PVC material with conductive properties.

[0075] Comparative Examples 1-2

[0076] Comparative Example 1

[0077] The difference between Comparative Example 1 and Example 2 is that Comparative Example 1 did not contain modified magnesium aluminum hydrotalcite.

[0078] Comparative Example 2

[0079] The difference between Comparative Example 2 and Example 2 is that lanthanum stearate was not added to Comparative Example 2.

[0080] Experimental testing

[0081] Testing items and testing methods

[0082] Conductivity: The volume resistivity of the PVC material at 23℃ was tested according to GB / T 1410-2006 "Test Methods for Volume Resistivity and Surface Resistivity of Solid Insulating Materials". The lower the volume resistivity, the better the conductivity of the material.

[0083] Thermal stability: The thermal stability of PVC materials prepared according to the Congo red method in GB / T 2917-1982 "Test Methods for Thermal Stability of Polyvinyl Chloride - Congo Red Method and pH Method" is tested at a temperature of 200℃. The longer the stability time from the start of heating to the color change of the test paper, the higher the thermal stability of the material.

[0084] The volume resistivity and stabilization time of the PVC materials prepared in Examples 1-3 and Comparative Examples 1-2 were tested, and the test results are shown in Table 1.

[0085] Table 1

[0086]

[0087] As can be seen from the test results in Table 1, the PVC materials prepared in Examples 1-3 have low volume resistivity, long stabilization time, and excellent electrical conductivity and thermal stability.

[0088] Comparative Example 1 did not contain modified magnesium aluminum hydrotalcite, and Comparative Example 2 did not contain lanthanum stearate. The electrical conductivity and thermal stability of the PVC materials prepared in Comparative Examples 1 and 2 were significantly reduced.

[0089] Examples 4-12

[0090] Example 4

[0091] The difference between Example 4 and Example 2 is that in Example 4, the plasticizer is trioctyl trimellitate.

[0092] Example 5

[0093] The difference between Example 5 and Example 2 is that in Example 5, the stabilizer is zinc stearate and triphenyl phosphite in a mass ratio of 1:1.

[0094] Example 6

[0095] The difference between Example 6 and Example 2 is that in Example 6, the average particle size of calcium carbonate is 1 μm.

[0096] Example 7

[0097] The difference between Example 7 and Example 2 is that in Example 7, the average particle size of calcium carbonate is 0.5 μm.

[0098] Example 8

[0099] The difference between Example 8 and Example 6 is that in Example 8, the average particle size of the nano silver powder is 35 nm and the average particle size of the nano nickel powder is 55 nm.

[0100] Example 9

[0101] The difference between Example 9 and Example 6 is that in Example 9, the average particle size of the nano silver powder is 50 nm and the average particle size of the nano nickel powder is 80 nm.

[0102] Example 10

[0103] The difference between Example 10 and Example 8 is that in Example 10, the composite lubricant is a mixture of glyceryl stearate and oxidized polyethylene wax in a mass ratio of 2:1.

[0104] Example 11

[0105] The difference between Example 11 and Example 8 is that in Example 11, the total weight of modified magnesium aluminum hydrotalcite and lanthanum stearate is 3.3 parts, and the weight ratio of modified magnesium aluminum hydrotalcite to lanthanum stearate is 8:1.

[0106] Example 12

[0107] The difference between Example 12 and Example 8 is that in Example 12, the total weight of modified magnesium aluminum hydrotalcite and lanthanum stearate is 3.3 parts, and the weight ratio of modified magnesium aluminum hydrotalcite to lanthanum stearate is 6:1.

[0108] The volume resistivity and stabilization time of the PVC materials prepared in Examples 4-12 were tested, and the test results are shown in Table 2.

[0109] Table 2

[0110]

[0111] As shown in Table 2, Example 4, using different plasticizers, resulted in minimal changes in the electrical conductivity and thermal stability of the PVC material. Example 5, using a composite stabilizer, showed improved electrical conductivity and thermal stability in the PVC material.

[0112] The difference between Examples 6 and 7 and Example 2 is that the average particle size of calcium carbonate is different. Among them, the PVC material prepared in Example 6 has the best electrical conductivity and thermal stability.

[0113] The difference between Examples 8 and 9 and Example 6 is that the average particle size of the nano silver powder and nano nickel powder is different. Among them, the PVC material prepared in Example 8 has the best electrical conductivity and thermal stability.

[0114] The different ratios of the composite lubricant in Example 10 resulted in improved electrical conductivity and thermal stability of the PVC material.

[0115] The difference between Examples 11, 12 and 8 is that the weight ratio of modified magnesium aluminum hydrotalcite and lanthanum stearate is different. Among them, the PVC material prepared in Example 11 has the best electrical conductivity and thermal stability.

[0116] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the principles of this application should be included within the protection scope of this application.

Claims

1. A PVC material with conductive properties, characterized in that, By weight, its raw material composition includes: 80-120 parts of polyvinyl chloride resin powder, 50-70 parts of plasticizer, 1-2 parts of stabilizer, 20-30 parts of calcium carbonate, 10-20 parts of superconducting carbon black, 3-7 parts of nano silver powder, 3-7 parts of nano nickel powder, 0.5-1.5 parts of composite lubricant, 2-5 parts of modified magnesium aluminum hydrotalcite, and 0.2-0.5 parts of lanthanum stearate; The modified magnesium aluminum hydrotalcite is a stearic acid-modified magnesium aluminum hydrotalcite coated with polyaniline.

2. The PVC material according to claim 1, characterized in that, The average degree of polymerization of the polyvinyl chloride resin powder is 1000~1300.

3. The PVC material according to claim 1, characterized in that, The plasticizer includes at least one of dioctyl phthalate, dioctyl terephthalate, and trioctyl trimellitate. The stabilizer includes at least one of calcium stearate, zinc stearate, and triphenyl phosphite.

4. The PVC material according to claim 1, characterized in that, The average particle size of the calcium carbonate is 0.5 μm to 2 μm.

5. The PVC material according to claim 1, characterized in that, The superconducting carbon black has a DBP oil absorption value of 300 mL / 100g to 400 mL / 100g.

6. The PVC material according to claim 1, characterized in that, The average particle size of the nano-silver powder is 20nm~50nm, and the average particle size of the nano-nickel powder is 30nm~80nm.

7. The PVC material according to claim 1, characterized in that, The composite lubricant comprises a first lubricant and a second lubricant in a mass ratio of (1~2):1; The first lubricant is selected from glyceryl stearate or pentaerythritol stearate; The second lubricant is selected from oxidized polyethylene wax or calcium stearate.

8. The PVC material according to claim 1, characterized in that, The weight ratio of the modified magnesium aluminum hydrotalcite to the lanthanum stearate is (6~10):

1.

9. A method for preparing a PVC material with conductive properties as described in claim 1, characterized in that, Includes the following steps: Step S1: Mix the superconducting carbon black, nano silver powder and nano nickel powder at a speed of 500 rpm to 800 rpm for 3 min to 5 min to obtain a premix. Step S2: Mix the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant for 2 min to 3 min, add the plasticizer, heat to 100℃ to 120℃, and mix at 1200 rpm to 1500 rpm for 8 min to 12 min to obtain the mixture. Step S3: Extrude the mixture, cool and granulate it to obtain a PVC material with conductive properties.

10. The preparation method according to claim 9, characterized in that, The preparation steps of the modified magnesium aluminum hydrotalcite are as follows: Step 1: Disperse magnesium aluminum hydrotalcite in deionized water, add stearic acid, stir and react at 70℃~80℃ for 2h~4h, filter, wash and dry to obtain stearic acid modified magnesium aluminum hydrotalcite; wherein, the amount of stearic acid is 5%~15% of the mass of magnesium aluminum hydrotalcite; Step 2: Disperse the stearic acid-modified magnesium aluminum layered double hydroxide in a 0.5 mol / L to 1.5 mol / L hydrochloric acid solution, add aniline monomer, stir and adsorb under ice bath conditions for 30 to 60 minutes, slowly add ammonium persulfate aqueous solution at 0 to 5°C, and continue stirring and reacting for 6 to 8 hours; wherein, the molar ratio of aniline to ammonium persulfate is 1:1, and the polyaniline coating amount is 5% to 15% of the mass of magnesium aluminum layered double hydroxide; Step 3: Filter by suction, wash with hydrochloric acid solution, deionized water and ethanol in sequence until the filtrate is colorless, and dry under vacuum to obtain the modified magnesium aluminum hydrotalcite.

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