Radiation crosslinking polyvinyl chloride material and its prepn. method

A polyvinyl chloride and radiation cross-linking technology, which is applied in the field of radiation treatment of polymer substances, can solve the problems of unfavorable industrial production, inconvenient actual operation, long radiation source cycle, etc. The effect of efficiency

Inactive Publication Date: 2003-05-07
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the weight fraction of expensive TMPTMA is as high as 37%, and the radiation crosslinking process must be carried out under nitrogen protection. In addition, to obtain polyvinyl chloride crosslinked materials with high gel content, the radiation temperature must be high. Inconvenience to actual operation
Although this method reduces the amount of high-priced cross-linking agent TMPTMA, the improvement of its cross-linking efficiency is to absorb a large amount of plasticizers by saturated CPE and reduce the plasticizers that effectively plasticize PVC to improve the cross-linking efficiency of PVC. In addition, Co -60 The radiation source has a long period, low efficiency and high cost, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The polyvinyl chloride resin (molecular weight 8.1×10 4 ) 75 parts, cross-linking agent TMPTMA 8 parts, nitrile rubber (acrylonitrile content is 32%, molecular weight 1×10 4 ) 25 parts, plasticizer TOTM 40 parts, stabilizers tribasic lead sulfate and dibasic lead phosphite 4 parts each, lubricant OPE 0.8 parts, filler light active calcium carbonate 8 parts, antioxidant phosphite one 0.2 part of benzenediisooctyl ester is mixed in a mixer for about 10 minutes, and when the temperature reaches 60-80°C, the end of the mixing is reached, and the blend powder is obtained. Then plasticize and granulate in a two-stage twin-screw extrusion granulation unit to obtain blended pellets. Then the pellets are made into construction wires, and they are radiated in the air at room temperature. The radiation dose of the electron accelerator is controlled to 5 Mrad, and the construction wires of radiation cross-linked polyvinyl chloride materials are obtained. Performance test results: the g...

Embodiment 2

[0048] The polyvinyl chloride resin (molecular weight 1.56×10 5 ) 50 parts, crosslinking agent TPGDA 15 parts, nitrile rubber (acrylonitrile content is 41%, molecular weight 5×10 3 ) 50 parts, plasticizer DIDP 40 parts, stabilizer tribasic lead sulfate 6 parts and dibasic lead phosphite 6 parts, lubricant OPE 0.4 parts, pottery clay 8 parts, antioxidant phosphate diisooctyl phosphate 0.1 part of ester. The blend pellets were prepared in the same manner as in Example 1. Then the pellets are first passed through the melt extrusion equipment, and then coated on the core insulation layer by the cable mold as a sheath layer. The radiation is carried out at room temperature and in the air, and the radiation dose of the electron accelerator is controlled to 6Mrad, that is, it has Radiation cross-linked cables with PVC sheath. Performance test results: gel content 94%, tensile strength 31.2Mpa, elongation at break 110%, material Shore hardness 92A. Heat distortion at 120°C is 12.1%.

Embodiment 3

[0050] The polyvinyl chloride resin (molecular weight 5×10 4 ) 100 parts, crosslinking agent TMPTMA 10 parts, nitrile rubber (acrylonitrile content is 32%, molecular weight 2×10 5 ) 80 parts, plasticizer TOTM 30 parts, stabilizer tribasic lead sulfate 6 parts and dibasic lead phosphite 6 parts, lubricant OPE 0.4 parts, filler light active calcium carbonate 8 parts, antioxidant 1010 0.1 Copies. The blend pellets were prepared in the same manner as in Example 1. Then the pellets are first passed through the melt extrusion equipment, and then coated on the core as an insulating layer through the cable mold, and then coated on the core insulating layer as a sheath layer, and radiated in the air at room temperature. The radiation dose of the electron accelerator is controlled to 5Mrad, which means a cable with radiation cross-linked polyvinyl chloride material insulation layer and sheath layer. Performance test results: gel content 84%, tensile strength 24.3Mpa, elongation at break 175...

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Abstract

A radiation cross-linked polyvinyl chloride material is prepared from polyvinyl chloride, nitrile rubber, cross-linking agent, plasticizer, stabilizer, lubricant, antioxidizing agent and filler through mixing and radiating by electronic accelerator. Its advantages are high gel content up to 84-95%, and better mechanical performance, and antiwear and refractory nature.

Description

Technical field [0001] The invention relates to radiation treatment of high molecular substances, in particular to a radiation cross-linked polyvinyl chloride material and a preparation method thereof. Background technique [0002] The radiation technology of polyvinyl chloride materials began to be researched in 1959. When polyvinyl chloride materials were irradiated, the materials were cross-linked and also degraded to a certain extent. In order to improve the cross-linking efficiency and reduce the degree of degradation, the control of the radiation process conditions is quite harsh. In the early 1980s, a systematic study of the radiation crosslinking reaction mechanism of polyvinyl chloride was carried out, and it was preliminarily proved that some multifunctional unsaturated monomers can sensitize the crosslinking process of polyvinyl chloride and improve the crosslinking efficiency. In 1981, T.N. Bowmer et al. studied the PVC / TMPTMA cross-linking system, and controlled cert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/28C08L9/02C08L27/06
Inventor 李恩军章长明袁茂全张为民张勇王仕峰张良
Owner SHANGHAI CHLOR ALKALI CHEM
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