Preparation process for cable material of radiation resisting low flue unhalogen flame-retarded ethylpropyl rubber

Abstract

The present invention discloses the preparation process of irradiation resistant low smoke no-halogen fire retarding ethylene-propylene rubber as cable material. The preparation process includes heating and mixing ethylene-propylene rubber, aluminum hydroxide, silicone as fire retarding synergist, lead compound, antiager, copper resisting agent, gamma ray absorbent, liquid peroxide vulcalizer and phenolic heat stabilizer in a banbury mixer; and air cooled pelletizing in a double screw extruder. Thus prepared cable material has volume resistivity higher than 2x1015 Ohm.cm, heat life over 90 deg.c x 50 year, accumulated gamma ray resistance of 220 Mrad and radiation dosage rate resistance lower than 1Mrad / h, and is suitable for producing cable insulation layer for use in high nuclear radiation environment.

Description

technical field [0001] The invention relates to a preparation method of a cable material, in particular to a preparation method of a radiation-resistant, low-smoke, halogen-free, and flame-retardant ethylene-propylene rubber cable material. Background technique [0002] With the rapid development of nuclear power, the importance of safe power transmission is also highlighted. Among them, the insulating materials used for power transmission of nuclear power equipment and instrumentation control are also one of the keys. It is required that polymer insulation must have the characteristics of radiation resistance, oxidation resistance and long life. . [0003] As we all know, wires and cables are one of the important power and information transmission equipment, and the sheath of wires and cables is usually composed of polyolefin materials. With the rapid growth of global wire and cable production in recent years, fire accidents caused by burning have become a major social pro...

AI Technical Summary

Problems solved by technology

[0005] U.S. Patent 4801639 introduces a resin compound using silane-grafted polyolefin, compounded with aluminum hydroxide and magnesium hydroxide, which has good flame-retardant effect and mechanical properties. The resin compound is halogen-free and low-smoke flame-retardant. Personal safety and environmental hazards are small, but the resin compound has no crosslinking, insufficient heat resistance, and does not have high-intensity radiation resistance

[0006] "New Chemical Materials" No. 1, 2006, pages 57-60 introduced the mechanical properties and dispersion forms of radiation vulcanized EPDM rubber filled with nano fillers. Silicon oxide, nano-calcium carbonate, etc. are fillers of EPDM rubber, but they do not have high-intensity radiation resistance and are not suitable for high-intensity nuclear radiation environments