Method for preparing PVC conductive composite material through mechanical milling method

A conductive composite material, mechanical ball milling technology, applied in the direction of grain processing, etc., can solve the problems of uneven dispersion of fillers, uneven material composition, unstable performance, etc., to shorten the ball milling time, easy to adjust the resistivity, and electrical conductivity. Enhanced effect

Inactive Publication Date: 2015-06-03
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the problems of uneven filler dispersion, uneven material composition and unstable performance in the existing powder mixing method for preparing conductive materials, and provide a method for preparing PVC conductive composite materials by mechanical ball milling

Method used

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  • Method for preparing PVC conductive composite material through mechanical milling method

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Embodiment 1

[0035] The preparation method of the PVC conductive composite material in this embodiment is firstly to place the graphite in absolute ethanol with the addition of coupling agent silane KH570, the amount of silane KH570 is 2% of the graphite weight, and stir at a constant temperature until the graphite is dispersed in ethanol , suction filtration, dry the graphite to obtain modified graphite, put the modified graphite and PVC in the ratio of 20%:80% into a circulating water type high-energy ball mill, and mechanically ball mill at a speed of 150 rpm and a temperature of 50°C for 1 h , disperse the graphite evenly into the PVC matrix to obtain a mixture, fill the mixture into the mold of a flat vulcanizer, heat press at a pressure of 5 MPa and a temperature of 165°C for 15 minutes, and demould to obtain a PVC conductive composite material.

[0036] The product prepared in this example has a conductive permeation threshold lower than 6%, a resistivity of 0.169 Ω·cm, a tensile str...

Embodiment 2

[0038] The preparation method of this PVC conductive composite material in the present embodiment, at first is that graphite is placed in the dehydrated alcohol that adds coupling agent aluminate, and the consumption of aluminate is 2.5% of graphite weight, is stirred at constant temperature until graphite is dispersed in In ethanol, filter with suction, dry the graphite to obtain modified graphite, put the modified graphite and PVC in the ratio of 15%:85% into a circulating water-type high-energy ball mill, and mechanically ball mill at a speed of 100 rpm and a temperature of 45°C 2.0 h, disperse the graphite evenly into the PVC matrix to obtain a mixture, fill the mixture into the mold of a flat vulcanizer, heat press at a pressure of 6 MPa and a temperature of 160°C for 20 minutes, and demould to obtain a PVC conductive composite material.

[0039] The product prepared in this example has a conductive percolation threshold lower than 6%, a resistivity of 0.499 Ω·cm, a tensil...

Embodiment 3

[0041] The preparation method of the PVC conductive composite material in this embodiment is firstly to place the graphite in absolute ethanol with the addition of coupling agent titanate, the amount of titanate is 1% of the weight of the graphite, and stir at a constant temperature until the graphite is dispersed in In ethanol, filter with suction, dry the graphite to obtain modified graphite, put the modified graphite and PVC in the ratio of 18%:82% into a circulating water-type high-energy ball mill, and mechanically ball mill at a speed of 300 rpm and a temperature of 48°C After 0.5 h, the graphite was evenly dispersed into the PVC matrix to obtain a mixture, which was filled into the mold of a flat vulcanizer, and hot-pressed at a pressure of 7 MPa and a temperature of 180°C for 10 minutes, and demolded to obtain a PVC conductive composite material.

[0042] The product prepared in this example has a conductive permeation threshold lower than 6%, a resistivity of 0.252 Ω·c...

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Abstract

The invention relates to the field of conductive composite material processes and particularly discloses a method for preparing a PVC conductive composite material through a mechanical milling method. The method comprises the following steps: putting the graphite in the absolute ethyl alcohol containing a coupling agent, stirring under a constant temperature till the graphite is dispersed in the ethyl alcohol, performing extraction filtration, baking the graphite to obtain the modified graphite, putting the modified graphite and the PVC at a ratio of (15-20%): (80-85%) into a circulating water type high-energy ball mill, performing mechanical milling for 0.5-2.5 hours to obtain the mixed materials, filling the mixed materials in a mould of a press vulcanizer, performing high temperature heat pressing and demoulding to obtain the PVC conductive composite material. By adopting the preparation method, the interface difference between the graphite and the PVC is eliminated so that the graphite is uniformly dispersed in the PVC matrix; a dense conductive network is formed inside the composite material so that the conductive performance of the composite material is obviously reinforced; and besides the method is high in reaction efficiency, energy-saving, free of industrial waste and low in production cost.

Description

technical field [0001] The invention relates to the field of processing conductive composite materials, in particular to a method for preparing PVC conductive composite materials by mechanical ball milling. Background technique [0002] PVC (polyvinyl chloride) is one of the five general-purpose plastics, with a huge production volume at home and abroad and a wide range of applications. A large part of products in daily life are made of PVC, but some of its own defects, such as electrical insulation, greatly limit its application range. Preparation of insulating PVC into a composite material with good electrical conductivity will expand the application of PVC in integrated circuits, chemical equipment, outer packaging materials, aerospace and other fields. [0003] Conductive plastics can be classified into structural conductive plastics and composite conductive plastics according to the production method. Structural conductive plastics, also known as intrinsic conductive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/06C08K9/04C08K3/04B29C35/02B02C17/00
CPCC08K9/06B02C17/10B29B13/06B29C35/02C08K3/04C08K9/04C08K2201/001
Inventor 沈芳胡华宇周延松覃宇奔黄祖强张燕娟杨梅覃杏珍黄爱民冯振飞常亚丽郑为朋
Owner GUANGXI UNIV
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