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Semi-conductive ethylene vinyl acetate (EVA) plastic for shielding and production method thereof

A semi-conductive, plastic technology, used in the field of wire and cable plastics, can solve the problems of small investment, complex production process, water-containing micropores in the insulating layer, etc., and achieve the effect of reducing excessive concentration, good electrical conductivity, good dispersion and lubrication.

Active Publication Date: 2013-01-23
ANHUI LIANJIAXIANG SPECIAL CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The peroxide cross-linking method is widely used, but it requires high temperature and high pressure; the silane boiling cross-linking method requires less investment, and can obtain better peelability than the peroxide cross-linking method, but the production process is complicated and must be processed after extrusion. Cross-linking in moisture can easily cause water-containing micropores on the insulating layer; radiation cross-linking is room temperature cross-linking, and the resulting shielding layer has good performance and high production efficiency, but requires expensive equipment, such as electron ray accelerators, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 35 parts of conductive furnace carbon black; 20 parts of calcium carbonate; 2 parts of zinc oxide, preheat and dry to 80-85°C in a high-speed mixer, add 1.5 parts of trimethoxysilane coupling agent at a time after removing water, and stir at a high speed Discharge after about 5 minutes and cool down rapidly.

[0043] Take 100 parts of ethylene-vinyl acetate copolymer (EVA) as the base material, add 1.5 parts of oleic acid amide; 2 parts of polyethylene wax; 1 part of tricresyl phosphate; 4,4'-thiobis[3-methyl base-6-tert-butylphenol] 0.4 parts; together with the cooling materials in the first step, they are mixed and put into an internal mixer for mixing. During the mixing process, the temperature is controlled at 95-105°C. The mixing time is controlled to be 10-15 minutes.

[0044] Add 2 parts of 4,4'-bis[tert-butylperoperoxy] n-butyl valerate; 0.4 parts of TAIC into the internal mixer, heat-preserve and mix, keep the temperature constant, and the mixing time is ...

Embodiment 2

[0047] The conduction furnace method carbon black in example one is increased to 40 parts; Calcium carbonate is reduced to 15 parts; Trimethoxysilane coupling agent is increased to 2 parts, and erucic acid is increased to 2 parts, and other material proportioning is unchanged, and process parameter also remains unchanged.

[0048] Related properties: volume resistivity 3.16×10 4 Ω·cm.

Embodiment 3

[0050] The conduction furnace method carbon black in the example two is increased to 48 parts; Other material proportions remain unchanged, and process parameters also remain unchanged.

[0051] Related properties: volume resistivity 5.71×10 2 Ω·cm.

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Abstract

The invention relates to semi-conductive ethylene vinyl acetate (EVA) plastic for shielding and a production method thereof. A formula comprises EVA resin, carbon black, a dispersant, a cross-linking agent, a coupling agent and other aids. The carbon black is highly dispersed under the actions of the dispersant and relevant aids and the interlocking structures of carbon black particles are used, so that an EVA plastic product has high conductivity. The EVA plastic has the advantages of further enhancing the technology content of a cable, improving the flame resistance and the high temperatureresistance of the cable, lowering product cost and enhancing economic benefit. A large amount of graphite is added as a flame-resistant and high temperature-resistant filler and enhances the flame resistance of the cable together with an appropriate amount of chlorinated paraffin and zinc stannate. The filler has high compatibility with other materials and high dispersibility and is matched with other stabilizers, so that a product has high heat resistance stability and flame resistance. Moreover, the lubricating performance of the product is improved to a large extent, a polyvinyl chloride (PVC) mixture has high uniform plasticizing capacity and high-speed melt fluidity, and the product has smooth surface, soft handfeel and high performance.

Description

technical field [0001] The invention relates to a wire and cable plastic and a production method thereof, in particular to a formula of semi-conductive EVA plastic for shielding and a production method thereof. Background technique [0002] With the development of information transmission integration, broadband, intelligence, and digitization, various lines in the integrated wiring system engineering of buildings and buildings are more and more concentratedly arranged together, and high-speed data streams are interfered by the same frequency electromagnetic interference. , Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) issues are becoming more and more obvious. [0003] Early electromagnetic shielding technologies mainly used metals and their composite materials. These materials have good shielding properties, but they have low elasticity, high density, are easy to corrode, are expensive, and the shielding effectiveness is difficult to adjust. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K13/06C08K9/06C08K3/04C08K3/26C08K3/22C08K5/523H01B5/16H01B1/24
Inventor 黄冬莲
Owner ANHUI LIANJIAXIANG SPECIAL CABLE
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