Radiation cross-linked high temperature resistant cable accessories capable of low temperature processing and production method

Abstract

The invention discloses a radiation crosslinked high temperature resistant cable accessory capable of low temperature processing and a production method. The preparation material of the cable accessory contains the following components by weight: 100 parts of ethylene-tetrafluoroethylene copolymer, the crosslinked ethylene The molar ratio of the C-F group and the C-H group of the tetrafluoroethylene copolymer is 1: (2-9); 0.3-3 parts of the crosslinking agent; 0.3-4 parts of the heat-resistant agent; 0.3 parts of the antioxidant ~3 parts; 1~10 parts of antimony trioxide; 0.1~3 parts of pentaerythritol stearate; 0.1~2 parts of N′N‑ethylene bisstearamide; 0.1~3 parts of white oil. The invention not only has a low processing temperature and can be processed at a temperature of 200°C to 238°C, but also can make the crosslinking agent less volatilized and self-polymerizing, thereby improving the crosslinking effect and stability of the material, and the elongation at break of the material after crosslinking The rate is high, and the elongation at break can be maintained above 200%.

Description

technical field [0001] The invention relates to the technical field of cable accessories, in particular to radiation cross-linked high temperature resistant cable accessories and a production method. Background technique [0002] Ethylene-tetrafluoroethylene copolymer (ETFE), also known as F40, is a transparent crystalline material and is the strongest and lightest fluoroplastic. ETFE has excellent dielectric, insulating and mechanical properties, radiation resistance, crack resistance, aging resistance, resistance to various chemical solvents, high and low temperature resistance, and the long-term working temperature is between -65 ° C and 150 ° C. After ETFE resin is cross-linked and irradiated, its radiation resistance, tensile strength and aging resistance are greatly improved, and its long-term working temperature is increased to 200 ° C. It is widely used in special cable insulation, such as transportation, aviation, chemical and nuclear plants, oil wells And the insu...

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Problems solved by technology

[0003] The current X-ETFE material is easy to self-polymerize in the production process, and has strict requirements on the processing temperature. It has poor thermal stability during processing, and is prone to yellowing, and the color will further deepen after irradiation.

Chinese Patent Publication No. 105061876A discloses a radiation-crosslinked ethylene-tetrafluoroethylene copolymer insulating material with adjustable performance. By introducing a composite crosslinking agent containing crosslinking agent prepolymer technology, the improvement and Solve the problems of high smoke generation, poor thermal stability and yellowing of the cross-linking agent in the above-mentioned production process. However, the cross-linking agent prepolymer is difficult to produce, and is volatile, and the stability needs to be improved

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