Irradiation type ceramic fire-resistant silicone rubber, preparation method of rubber and application to wires and cables

Abstract

The invention discloses irradiation type ceramic fire-resistant silicone rubber, a preparation method of the rubber and application to wires and cables. The rubber comprises the following components in parts: 100 parts of methyl vinyl silicone rubber, 60-100 parts of white carbon black, 20-50 parts of alumina, 3-10 parts of structure control agent, 3-5 parts of sintering additive, 0.25-1.5 parts of surface treating agent and 1-1.5 parts of sensitizing agent. The preparation method of the silicone rubber comprises the steps that raw methyl vinyl silicone rubber is subjected to roller coating and mixing; white carbon black and alumina that are treated by the surface treating agent, the structure control agent, the treated sintering additive, and the sensitizing agent are added in sequence, and subjected to mixing uniformly; a sizing material after placing is subjected to remixing and plasticity recovery; and the balance of white carbon black is added. The fire-resistant silicone rubber material is subjected to extrusion processing and electron irradiation vulcanization, and has the advantages that the fire-resistant silicone rubber material is compact in ceramic body, stable in structure, stable in fire resistance, good in insulating property, less in environmental pollution, good in crosslinking uniformity and convenient in control measure, and the control measure can be conducted at a room temperature.

Description

[0001] technical field [0002] The invention relates to a material for preparing a refractory layer of an electric wire and cable, in particular to an irradiated ceramic refractory silicone rubber, a preparation method thereof and an application in an electric wire and cable. Background technique [0003] With the frequent occurrence of fire accidents, people's awareness of the fire hazards of wires and cables continues to deepen, and the relevant departments have higher and higher requirements for the performance of wires and cables such as fire resistance and flame retardancy. Because the cable fire has the characteristics of rapid spread, difficulty in fighting, secondary hazards, and long recovery time, it will bring huge losses to the national economy and the lives and properties of the people. Therefore, people have put forward more stringent operating conditions for the fire protection characteristics, safety and reliability of wires and cables. Such as fire pre...

AI Technical Summary

Problems solved by technology

For fire-resistant cables wrapped with mica tape, when the cable burns, the mica sinters and hardens to continue to play the role of insulation, so as to achieve the effect of fire resistance. However, whether it is synthetic mica tape, phlogopite tape, muscovite tape or other mica tapes have The main disadvantages are as follows: (1) Mica has strong water absorption, and it is easy to fail after absorbing water; (2) The processing method of mica tape is to paste mica powder with adhesive, so it is relatively hard. Among them, the mica powder is very easy to peel off. As long as there is peeling off, the insulation function will be lost, and it will not meet the requirements of use; at the same time, it will not be easy to wrap flat, evenly, tightly, and easily wrinkle, especially the processing of small cross-section soft conductors is difficult. (3) After being burned in a fire, the organic material polymer material will be burned, which will cause the internal structure of the cable to loosen, resulting in the shattering and falling off of the mica insulation layer, especially the effect of various vibrations, thus losing the insulation performance and cannot continue to maintain The power supply function in the flame, so its application is subject to certain restrictions

Silicone rubber extruded semi-finished products are soft and easy to deform, and are easy to stick to each other, so they must be vulcanized immediately. However, when the cable industry is in the layout of the workshop, the distance between the silicone rubber cable production line and the irradiation production line is long, and it is limited by the production plan. , can not be vulcanized immediately, thus limiting the application of silicone rubber irradiation technology

Silicone rubber is a polymer that can be crosslinked by radiation. However, to achieve a high degree of crosslinking and gel content, a high absorbed dose is still required, resulting in high costs, and large doses of radiation will also produce Side reactions such as oxidative degradation and destruction of additives in the material affect the performance of the material

The irradiation equipment used in the cable industry has a small dose and cannot perform large doses of irradiation