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Method for preparing crosslinkable polyethylene insulated cable material

A cross-linked polyethylene, insulated cable technology, applied in the direction of organic insulators, plastic/resin/wax insulators, etc., can solve the problem of increasing the chance and time of LDPE heating and mechanical shearing, difficult to use high-grade insulating cable materials, increasing polymer Thermal oxidation and other problems to achieve the effect of meeting performance requirements, high processing stability and uniform distribution

Inactive Publication Date: 2010-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-step technology mainly has the following problems: 1) The two-time melt extrusion blending process increases the chance and time of LDPE heating and mechanical shearing, which easily leads to oxidation of LDPE. At the same time, the peroxide is easy to decompose during the melt extrusion process , so that LDPE is pre-crosslinked, which increases the hidden danger of electrical breakdown, and is difficult to be used as a high-grade insulating cable material
However, there is still a melt-shear process between the antioxidant and polyethylene. In addition, due to the high melting point of the antioxidant used in domestic production, it must be extruded at a higher temperature, which increases the chance of thermal oxidation of the polymer. , at the same time, the production process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) Dissolve β(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and dilauryl thiodipropionate in dissolved diisopropyl peroxide at a mass ratio of 1:1 In benzene, the total mass of beta (3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and dilauryl thiodipropionate is 8% of dicumyl peroxide, mixed Evenly, to obtain liquid composite additives, use 800 mesh filter to remove impurities in the liquid composite additives;

[0013] 2) Mix the liquid compounding aid and the low-density polyethylene pellets at a mass ratio of 2:100 at 80°C for 1.5 hours, and through the liquid-solid diffusion between the liquid compounding aid and the low-density polyethylene pellets, the liquid Compounding additives are evenly absorbed by low-density polyethylene pellets. Then diffuse at a constant temperature of 80° C. for 15 hours to obtain a cross-linkable polyethylene insulating cable material.

Embodiment 2

[0015] 1) Mix 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) ethyl propionate] and distearyl thiodipropionate in a mass ratio of 1 : 2 dissolved in dissolved dicumyl peroxide, 2,2'-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) ethyl propionate] and thiobis The total mass of Distearyl Propionate is 25% of dicumyl peroxide, mix uniformly to obtain the liquid composite auxiliary agent, and remove impurities in the liquid composite auxiliary agent with 2500 mesh filter screens;

[0016] 2) Mix the liquid compounding aid and the low-density polyethylene pellets at a mass ratio of 3:100 at 60°C for 2 hours, and through the liquid-solid diffusion between the liquid compounding aid and the low-density polyethylene pellets, the liquid compounding The additives are absorbed evenly by the LDPE pellets. Then diffuse at a constant temperature of 60° C. for 35 hours to obtain a cross-linkable polyethylene insulating cable material.

Embodiment 3

[0018] 1) Dissolve tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester and dilauryl thiodipropionate in the dissolving solution at a mass ratio of 1:1.5 The total mass of tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and dilauryl thiodipropionate in dicumyl peroxide 15% of dicumyl peroxide, mixed uniformly to obtain a liquid composite additive, and a 2500-mesh filter screen was used to remove impurities in the liquid composite additive;

[0019] 2) Mix the liquid compounding aid and low-density polyethylene pellets at a mass ratio of 1.5:100 at 60°C for 2 hours, and through the liquid-solid diffusion between the liquid compounding aid and low-density polyethylene pellets, the liquid compounding The additives are absorbed evenly by the LDPE pellets. Then diffuse at a constant temperature of 70°C for 25 hours to obtain a cross-linkable polyethylene insulating cable material.

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PUM

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Abstract

The invention discloses a method for preparing a crosslinkable polyethylene insulated cable material. The method comprises the following steps of: dissolving an oxidation inhibitor in a dissolved cross-linking agent to obtain a liquid compound aid; filtering the liquid compound aid to remove impurities; mixing the liquid compound aid and low density polyethylene granules at the temperature of between 60 and 80 DEG C; and diffusing the liquid compound aid into the low density polyethylene granules gradually in a temperature range of between 60 and 100 DEG C to obtain a uniformly diffused compound aid-containing crosslinkable polyethylene insulated cable material. The method has a simple preparation process and can completely avoid the heating of melt extrusion in a material preparation process, thereby avoiding possible induction of impurities caused by the heating of the melt extrusion and sufficiently ensuring the purity of the material; and the obtained product has high distribution uniformity of the compound aid and high processing stability, and meets performance requirements on a high-grade insulated cable material.

Description

technical field [0001] The invention relates to a preparation method of insulating cable material, especially a preparation method of crosslinkable polyethylene insulating cable material. Background technique [0002] At present, the production of cross-linkable polyethylene insulating cable materials generally adopts a two-step preparation technology. There are usually two processes, one is two melt extrusion processes: the first step is to combine antioxidants with low-density polyethylene (LDPE) is melted and blended at a temperature higher than the melting point of LDPE, and extruded by multi-layer filtration; in the second step, the LDPE material containing antioxidant obtained in the first step process is mixed with a crosslinking agent at a temperature higher than the melting point of LDPE, At the same time, the temperature lower than the decomposition temperature of the cross-linking agent is melted and blended again, extruded and granulated to obtain cross-linkable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K5/14C08K5/134C08K5/372H01B3/44
Inventor 杨红梅张小虎郑强
Owner ZHEJIANG UNIV
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