PVC (polyvinyl chloride) material with conductivity and preparation method thereof
By constructing a conductive network and forming multiple thermal stability barriers in PVC materials, the problem of balancing conductivity and thermal stability in existing technologies has been solved, and PVC materials with high conductivity and excellent thermal stability have been prepared.
Patent Information
- Application Number
- CN202511805859.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-01-23
AI Technical Summary
Existing PVC materials, after adding conductive fillers, cannot simultaneously achieve high conductivity and excellent thermal stability. Furthermore, conventional heat stabilizers have poor compatibility with conductive fillers, leading to deterioration of the material's mechanical properties and reduced processing fluidity.
A conductive network is constructed using superconducting carbon black, nano-silver powder, and nano-nickel powder, and multiple thermal stability barriers are formed by modified magnesium aluminum hydrotalcite and lanthanum stearate. Combined with calcium carbonate with specific particle size and DBP oil absorption value, plasticizer, and composite lubricant, the preparation method includes stepwise mixing and process parameter control.
It significantly improves the electrical conductivity and thermal stability of PVC materials, while maintaining good processing fluidity and mechanical properties, achieving a synergistic enhancement of electrical conductivity and thermal stability.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of polymer materials, and particularly relates to a PVC material with electric conductivity and a preparation method thereof. BACKGROUND
[0002] A metal shielding net layer is usually used in an electric wire and cable to suppress electromagnetic interference (EMI) and ensure the stability of signal transmission. However, the metal shielding structure has problems of large weight, poor flexibility, easy corrosion, complex processing, high cost and the like, and cannot meet the development requirements of light weight and flexibility. Therefore, non-metal shielding materials are gradually valued.
[0003] Polyvinyl chloride (PVC) is a general-purpose polymer material widely used in the sheath and insulation layer of an electric wire and cable, and has good flame retardance, mechanical properties and processing properties. However, PVC itself is an insulator and cannot directly realize electromagnetic shielding function. The prior art usually adds conductive fillers to PVC to construct a conductive network, so as to endow PVC with electric conductivity to realize electromagnetic shielding function. However, there are still obvious deficiencies in practical application: on the one hand, in order to achieve the required electric conductivity for effective shielding, a high proportion of conductive fillers is often needed, which easily leads to deterioration of mechanical properties of the material and poor processing fluidity; on the other hand, most conductive fillers can catalyze the dehydrochlorination reaction of PVC during high-temperature processing or long-term use, accelerate thermal degradation, cause discoloration, embrittlement and even functional failure of the material. Moreover, conventional thermal stabilizers have poor compatibility with conductive fillers, and it is difficult to improve thermal stability while maintaining efficient conductive paths.
[0004] Therefore, it is urgent to develop a PVC material with electric conductivity and a preparation method thereof, which can significantly improve electric conductivity while having excellent thermal stability. SUMMARY
[0005] Therefore, the application provides a PVC material with electric conductivity and a preparation method thereof. The conductive PVC material provided by the application can significantly improve electric conductivity while having excellent thermal stability.
[0006] In a first aspect, the application provides a PVC material with electric conductivity, and the raw material composition of the PVC material includes, in terms of weight parts, 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 technical scheme, the conductive PVC material provided by the application can significantly improve the conductivity while achieving excellent thermal stability. The superconducting carbon black, nano-silver powder and nano-nickel powder jointly form a conductive network, so that the material has high volume conductivity and wideband electromagnetic shielding capability. The modified magnesium-aluminum hydrotalcite can be uniformly dispersed in the PVC matrix and avoid damaging the conductive path, and can effectively absorb the HCl generated by the degradation of PVC during processing and use, thereby inhibiting the autocatalytic thermal degradation. The lanthanum stearate can form a multiple thermal stability barrier with the stabilizer and the modified magnesium-aluminum hydrotalcite, thereby significantly improving the thermal stability of the material.
[0008] In addition, the plasticizer and the composite lubricant of the application ensure good processing flowability of the high-filled system, and the calcium carbonate ensures the mechanical properties. The components of the application synergize with each other to obtain a conductive PVC material with high conductivity and excellent thermal stability.
[0009] Optionally, the average polymerization degree of the polyvinyl chloride resin powder is 1000-1300.
[0010] By adopting the technical scheme, the polyvinyl chloride resin powder with an average polymerization degree of 1000-1300 is selected, the corresponding molecular chain is longer, the thermal degradation starting point is effectively reduced, thereby delaying the HCl removal reaction and enhancing the thermal stability. At the same time, the polyvinyl chloride resin usually has a loose structure and high porosity, has excellent adsorption and accommodation capacity for plasticizers and conductive fillers, is beneficial to uniform dispersion of the fillers and avoids agglomeration to damage the conductive network, thereby ensuring 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 technical scheme, the plasticizer of the application not only can give the PVC good flexibility and processing flowability, but also can promote uniform dispersion of the conductive fillers, thereby synergistically improving 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 technical scheme, the stabilizer of the application can significantly improve the thermal stability and effectively protect the conductive network composed of nano-silver, nano-nickel and superconducting carbon black from thermal degradation damage, thereby improving the conductivity and thermal stability of the material.
[0015] Optionally, the average particle size of the calcium carbonate is 0.5-2 μm.
[0016] By adopting the above technical scheme, the calcium carbonate with the specific average particle size has good dispersibility and is not prone to agglomeration, and the adsorption of the calcium carbonate to the stabilizer and the plasticizer is less, so that the formation of the conductive network is avoided, thereby helping the processing performance and the conductivity of the material.
[0017] Optionally, the DBP oil absorption value of the superconducting carbon black is 300 mL / 100g to 400 mL / 100g.
[0018] By adopting the above technical scheme, the DBP oil absorption value of the superconducting carbon black ensures that the carbon black has excellent dispersibility and conductivity in the PVC matrix, helps to enhance the ability of the carbon black to form a continuous conductive path in the PVC matrix, and thus improves the conductivity of the material. In addition, the excessive adsorption of the plasticizer or the stabilizer is avoided, and the thermal stability and the processing performance of the PVC matrix are prevented from being affected, so that a good balance between the conductivity and the thermal stability is achieved.
[0019] Optionally, the average particle size of the nano-silver powder is 20nm to 50nm, and the average particle size of the nano-nickel powder is 30nm to 80nm.
[0020] By adopting the above technical scheme, the average particle size range of the nano-silver powder and the nano-nickel powder can ensure that the nano-particles have a high specific surface area and good conductive activity, effectively bridge the superconducting carbon black particles to build a dense three-dimensional conductive network, avoid serious agglomeration caused by too small particle size, and cause the shielding efficiency to decrease caused by too large particle size. At the same time, the nano-particles in this range have good dispersibility in the PVC matrix, are not prone to destroy the processing fluidity of the material, and are well compatible with the modified magnesium-aluminum hydrotalcite, the stabilizer and other components, so that the conductivity is improved while the excellent thermal stability is maintained.
[0021] Optionally, the composite lubricant includes a first lubricant and a second lubricant in a mass ratio of (1 to 2):1; the first lubricant is selected from glycerol stearate or pentaerythritol stearate; and the second lubricant is selected from oxidized polyethylene wax or calcium stearate.
[0022] By adopting the above technical scheme, the first lubricant and the second lubricant of the present application synergistically act in the above ratio, which can effectively alleviate the processing difficulty brought by the high-filled conductive system, and avoid poor plasticization or mechanical property decline caused by unbalanced lubrication, so as to realize stable processing of the PVC material.
[0023] Optionally, the weight ratio of the modified magnesium-aluminum hydrotalcite to the lanthanum stearate is (6 to 10):1.
[0024] By adopting the technical scheme, the modified magnesium-aluminum hydrotalcite and the lanthanum stearate can synergistically improve the thermal stability of the material. The modified magnesium-aluminum hydrotalcite can absorb the HCl generated in the degradation of PVC through the layered structure, and inhibit the self-catalytic dehydrochlorination reaction; the lanthanum stearate can replace the unstable chlorine atoms on the PVC chain, effectively improving the thermal stability. The two are used in the above proportion, which can significantly improve the thermal stability of the material while not damaging the electrical conductivity.
[0025] In a second aspect, the application provides a preparation method of the PVC material with electrical conductivity, comprising the following steps: Step S1, the superconducting carbon black, nano-silver powder and nano-nickel powder are mixed at a speed of 500 rpm to 800 rpm for 3 min to 5 min to obtain a premix; Step S2, the premix, the polyvinyl chloride resin powder, calcium carbonate, modified magnesium-aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant are mixed for 2 min to 3 min, the plasticizer is added, and the temperature is raised to 100℃ to 120℃, and then mixed at a speed of 1200 rpm to 1500 rpm for 8 min to 12 min to obtain a mixture; Step S3, the mixture is extruded and formed, and then cooled and granulated to obtain the PVC material with electrical conductivity.
[0026] By adopting the technical scheme, the preparation method provided by the application effectively guarantees the synergistic realization of electrical conductivity and thermal stability through step-by-step mixing and process parameter control. Step S1 initially constructs an efficient electrical conduction path; Step S2 makes the PVC fully plasticized and also avoids early degradation caused by high temperature; Step S3 maintains the integrity of the electrical conduction network while obtaining a PVC material with a compact structure and stable performance. The method is simple in process and easy to operate, and can meet the industrialization needs.
[0027] Optionally, the modified magnesium-aluminum hydrotalcite is a polyaniline-coated stearic acid modified magnesium-aluminum hydrotalcite, and the preparation steps are as follows: Step one: disperse the magnesium-aluminum hydrotalcite in deionized water, add stearic acid, stir and react at 70℃ to 80℃ for 2 h to 4 h, and then perform suction filtration, washing and drying to obtain the stearic acid modified magnesium-aluminum hydrotalcite; wherein the amount of stearic acid is 5% to 15% of the mass of the magnesium-aluminum hydrotalcite; Step two: disperse the stearic acid modified magnesium-aluminum hydrotalcite in a 0.5 mol / L to 1.5 mol / L hydrochloric acid solution, add aniline monomer, stir and adsorb for 30 min to 60 min under ice bath, slowly add ammonium persulfate aqueous solution at 0℃ to 5℃, and continue to stir and react for 6 h to 8 h; 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 the magnesium-aluminum hydrotalcite; Step three: filter, wash with hydrochloric acid solution, deionized water and ethanol in turn until the filtrate is colorless, and dry in vacuum to prepare the modified magnesium-aluminum hydrotalcite.
[0028] By adopting the technical scheme, the polyphenylamine coated stearic acid modified magnesium-aluminum hydrotalcite has good dispersibility in the PVC matrix, also has conductivity, can effectively bridge the superconducting carbon black and nano metal particles, further improves the overall conductivity, meanwhile retains the ability of the magnesium-aluminum hydrotalcite to absorb HCl, maintains excellent thermal stability, and realizes the synergistic enhancement of conductivity and thermal stability.
[0029] In summary, the present application has at least one of the following beneficial technical effects: 1. The conductive PVC material provided by the present application realizes excellent thermal stability while significantly improving the conductivity.
[0030] 2. The preparation method provided by the present application is simple in process and easy to operate, and through step-by-step mixing and process parameter control, the synergistic realization of conductivity and thermal stability is effectively ensured. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.
[0032] The inventors of the present application found in the research of the conductive PVC material that the conductive PVC material in the prior art often has high proportion of conductive filler to improve the conductivity, but causes the deterioration of the mechanical properties of the material, and has poor thermal stability, so it is difficult to improve the conductivity and thermal stability at the same time.
[0033] In order to solve the above problems, the present application provides a PVC material with conductivity, and the raw material composition of the PVC material includes, by weight fraction, 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.
[0034] The present application also provides a preparation method of the above-mentioned PVC material with conductivity, which includes the following steps: Step S1, mix the superconducting carbon black, nano silver powder and nano nickel powder at a speed of 500 rpm-800 rpm for 3 min-5 min to prepare a premix; Step S2, the premix, the polyvinyl chloride resin powder, calcium carbonate, modified magnesium-aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant are mixed for 2-3 minutes, the plasticizer is added, the temperature is raised to 100-120°C, and mixing is performed at a speed of 1200-1500 rpm for 8-12 minutes to obtain a mixture; Step S3, the mixture is extruded, cooled and granulated to obtain a PVC material with conductive properties.
[0035] The scheme of the present application will be described below in conjunction with the following specific examples. Unless otherwise specified, the raw materials used in the following examples are all from ordinary commercial products, and the devices or equipment used are all purchased from conventional market channels. The preparation steps of the modified magnesium-aluminum hydrotalcite used in Examples 1-3 are as follows: Step 1: The magnesium-aluminum hydrotalcite is dispersed in deionized water, and stearic acid is added. Stirring and reaction are performed at 75°C for 3 hours. Filtration, washing and drying are performed to obtain stearic acid-modified magnesium-aluminum hydrotalcite. The amount of stearic acid is 10% of the mass of the magnesium-aluminum hydrotalcite. Step 2: The stearic acid-modified magnesium-aluminum hydrotalcite is dispersed in a 1 mol / L hydrochloric acid solution, and aniline monomer is added. Stirring and adsorption are performed under ice bath for 45 minutes. An ammonium persulfate aqueous solution is slowly added dropwise at 3°C, and stirring and reaction are continued for 7 hours. The molar ratio of aniline to ammonium persulfate is 1:1, and the polyaniline coating amount is 10% of the mass of the magnesium-aluminum hydrotalcite. Step 3: Filtration is performed, and the filter is washed with hydrochloric acid solution, deionized water and ethanol in sequence until the filtrate is colorless. Vacuum drying is performed to obtain the modified magnesium-aluminum hydrotalcite.
[0036] Examples 1-3 Example 1
[0037] The present example provides a PVC material with conductive properties, the raw material composition of which includes, in parts by weight: 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. The average polymerization degree of the polyvinyl chloride resin powder is 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate. The average particle size of the calcium carbonate is 2 μm; the DBP oil absorption value of the superconducting carbon black is 400 mL / 100g; the average particle size of the nano-silver powder is 20 nm, and the average particle size of the nano-nickel powder is 30 nm; and the composite lubricant is a mixture of glycerol stearate and oxidized polyethylene wax at a mass ratio of 1:1. The preparation method includes the following steps: Step S1, the superconducting carbon black, nano silver powder and nano nickel powder are mixed at a speed of 500 rpm for 5 min to prepare a premix; Step S2, the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium-aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant are mixed for 2 min, the plasticizer is added, and the temperature is raised to 100°C, and the mixture is mixed at a speed of 1500 rpm for 8 min to prepare a mixture; Step S3, the mixture is extruded and formed, and then cooled and granulated to prepare a PVC material with conductive properties. Example 2
[0038] The PVC material with conductive properties provided in this embodiment includes, by weight fraction, polyvinyl chloride resin powder 100 parts, plasticizer 60 parts, stabilizer 1.5 parts, calcium carbonate 25 parts, superconducting carbon black 15 parts, nano silver powder 5 parts, nano nickel powder 5 parts, composite lubricant 1 part, modified magnesium-aluminum hydrotalcite 3 parts, and lanthanum stearate 0.3 parts. The average polymerization degree of the polyvinyl chloride resin powder is 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate. The average particle size of the calcium carbonate is 2 μm; the DBP oil absorption value of the superconducting carbon black is 400 mL / 100g; the average particle size of the nano silver powder is 20 nm, and the average particle size of the nano nickel powder is 30 nm; and the composite lubricant is a mixture of glycerol stearate and oxidized polyethylene wax at a mass ratio of 1:1. The preparation method includes the following steps: Step S1, the superconducting carbon black, nano silver powder and nano nickel powder are mixed at a speed of 650 rpm for 4 min to prepare a premix; Step S2, the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium-aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant are mixed for 3 min, the plasticizer is added, and the temperature is raised to 110°C, and the mixture is mixed at a speed of 1300 rpm for 10 min to prepare a mixture; Step S3, the mixture is extruded and formed, and then cooled and granulated to prepare a PVC material with conductive properties. Example 3
[0039] The PVC material with conductive properties provided in this embodiment includes, by weight fraction, polyvinyl chloride resin powder 80 parts, plasticizer 70 parts, stabilizer 2 parts, calcium carbonate 30 parts, superconducting carbon black 20 parts, nano silver powder 3 parts, nano nickel powder 7 parts, composite lubricant 0.5 parts, modified magnesium-aluminum hydrotalcite 5 parts, and lanthanum stearate 0.5 parts. The average polymerization degree of the polyvinyl chloride resin powder is 1300; the plasticizer is dioctyl phthalate; and the stabilizer is calcium stearate. The average particle size of the calcium carbonate is 2 μm; the DBP oil absorption value of the superconducting carbon black is 400 mL / 100 g; the average particle size of the nano-silver powder is 20 nm, and the average particle size of the nano-nickel powder is 30 nm; the composite lubricant is glycerol stearate and oxidized polyethylene wax with a mass ratio of 1:1; The preparation method comprises the following steps: Step S1, the superconducting carbon black, nano-silver powder and nano-nickel powder are mixed at a rotating speed of 800 rpm for 3 min to prepare a premix; Step S2, the premix, polyvinyl chloride resin powder, calcium carbonate, modified magnesium-aluminum hydrotalcite, lanthanum stearate, stabilizer and composite lubricant are mixed for 3 min, a plasticizer is added, and the temperature is raised to 120 ℃, and the mixture is mixed at a rotating speed of 1200 rpm for 12 min to prepare a mixture; Step S3, the mixture is extruded and shaped, and cooled and granulated to prepare a PVC material with conductive properties.
[0040] Comparative Examples 1-2 Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that no modified magnesium-aluminum hydrotalcite is added in Comparative Example 1.
[0041] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that no lanthanum stearate is added in Comparative Example 2.
[0042] Experimental detection Detection items and detection methods Conductive properties: the volume resistivity of the prepared PVC material at 23 ℃ is detected according to GB / T 1410-2006 “Test method for volume and surface resistivity of solid insulating materials”, and the smaller the volume resistivity, the better the conductive properties of the material.
[0043] Thermal stability: the thermal stability of the prepared PVC material is detected according to the Congo red method in GB / T 2917-1982 “Test method for thermal stability of polyvinyl chloride—Congo red method and pH method”, and the longer the stable time from the start of heating to the discoloration of the test paper, the higher the thermal stability of the material.
[0044] The PVC materials prepared in Examples 1-3 and Comparative Examples 1-2 are detected for volume resistivity and stable time, and the detection results are shown in Table 1.
[0045] Table 1
[0046] From the detection results in Table 1, it can be seen that the PVC materials prepared in Examples 1-3 have small volume resistivity, long stable time, excellent conductive properties and thermal stability.
[0047] Comparative Example 1 does not add modified magnesium-aluminum hydrotalcite, and Comparative Example 2 does not add lanthanum stearate. The conductive properties and thermal stability of the PVC materials prepared in Comparative Examples 1-2 are both significantly reduced.
[0048] Examples 4-12 Example 4
[0049] Example 4 differs from Example 2 in that, in Example 4, the plasticizer is trioctyl trimellitate. Example 5
[0050] Example 5 differs from Example 2 in that, in Example 5, the stabilizer is zinc stearate and triphenyl phosphite in a mass ratio of 1:1. Example 6
[0051] Example 6 differs from Example 2 in that, in Example 6, the average particle size of the calcium carbonate is 1 μm. Example 7
[0052] Example 7 differs from Example 2 in that, in Example 7, the average particle size of the calcium carbonate is 0.5 μm. Example 8
[0053] Example 8 differs from Example 6 in 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. Example 9
[0054] Example 9 differs from Example 6 in 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. Example 10
[0055] Example 10 differs from Example 8 in that, in Example 10, the composite lubricant is glycerol stearate and oxidized polyethylene wax in a mass ratio of 2:1. Example 11
[0056] Example 11 differs from Example 8 in that, in Example 11, the total weight fraction of the modified magnesium-aluminum hydrotalcite and lanthanum stearate is 3.3 parts, and the weight ratio of the modified magnesium-aluminum hydrotalcite and lanthanum stearate is 8:1. Example 12
[0057] Example 12 differs from Example 8 in that, in Example 12, the total weight fraction of the modified magnesium-aluminum hydrotalcite and lanthanum stearate is 3.3 parts, and the weight ratio of the modified magnesium-aluminum hydrotalcite and lanthanum stearate is 6:1.
[0058] The PVC materials prepared in Examples 4-12 were subjected to volume resistivity and stabilization time testing, and the testing results are shown in Table 2.
[0059] Table 2
[0060] From the detection results of Table 2, it can be seen that the conductive properties and thermal stability of the PVC material prepared in Example 4 change little, because different plasticizers are selected. The conductive properties and thermal stability of the PVC material prepared in Example 5 are improved, because a composite stabilizer is selected.
[0061] The difference between Example 6, Example 7 and Example 2 is that the average particle size of calcium carbonate is different. The conductive properties and thermal stability of the PVC material prepared in Example 6 are the best.
[0062] The difference between Example 8, Example 9 and Example 6 is that the average particle size of nano-silver powder and nano-nickel powder is different. The conductive properties and thermal stability of the PVC material prepared in Example 8 are the best.
[0063] The ratio of the composite lubricant in Example 10 is different. The conductive properties and thermal stability of the PVC material prepared in Example 10 are improved.
[0064] The difference between Example 11, Example 12 and Example 8 is that the weight ratio of modified magnesium-aluminum hydrotalcite and lanthanum stearate is different. The conductive properties and thermal stability of the PVC material prepared in Example 11 are the best.
[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the principles of the present application shall be included in the protection scope of the present application.
Claims
1. A PVC material with conductive properties, characterized in that, By weight, its raw material composition includes: 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.
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 modified magnesium-aluminum hydrotalcite is a stearic acid-modified magnesium-aluminum hydrotalcite coated with polyaniline, and the preparation steps 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.