Fire-resistant ceramic silicone rubber, preparation method of fire-resistant ceramic silicone rubber and application in wires and cables

Abstract

The invention discloses a fire-resistant ceramic silicone rubber, a preparation method of the fire-resistant ceramic silicone rubber and application of the fire-resistant ceramic silicone rubber and in wires and cables. The rubber comprises 100 parts of methyl vinyl silicone rubber, 30-80 parts of carbon-white, 9- 40 parts of alumina, 1.5-8 parts of structure controlling agent, 3-5 parts of sintering additive, 0.25-1.5 parts of surface treating agent and 0.5-2 parts of crosslinking agent. The preparation method is as follows: covering rubber on and milling uniformly the methyl vinyl silicone rubber, feeding the carbon-white, the alumina, the surface treating agent, the structure controlling agent, the sintering additive and the crosslinking agent in turn, remlling the stand sizing material to recover plasticity, so as to obtain the fire-resistant ceramic silicone rubber provided by the invention. The fire-resistant ceramic silicone rubber provided by the invention has the characteristics of compact ceramic body, stable structure, stable fire-resistance property and good insulation property.

Description

technical field [0001] The invention relates to a rubber material, specifically a ceramic refractory silicone rubber, its preparation method and its application in electric wires and cables. Background technique [0002] 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 fireproof, explosion-proof, strong overload capacity, long service life, under fire conditions, fir...

AI Technical Summary

Problems solved by technology

For the fire-resistant cable wrapped with mica tape, when the cable is burned, 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 tape 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 insulating function will be lost, which cannot meet the requirements of use; at the same time, it is not easy to wrap flat, evenly, tightly, and easy to wrinkle, especially the processing of small cross-section soft conductors is difficult. (3) After being burned in a fire, the organic polymer material will be burned away, 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 limited

The "ceramic" structure formed by sintering a single combination of organic silicon chains and silicon oxide families is unstable. After burning, the ceramic silicon rubber is relatively brittle and prone to cracks, forming conductive channels, resulting in unstable fire resistance.