Single-component room temperature vulcanization type ceramic fireproof silicon rubber coating material as well as preparation method and application thereof

Abstract

The invention discloses a single-component room temperature vulcanization type ceramic fireproof silicon rubber coating material as well as a preparation method and an application thereof. The coating material comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10-20 parts of fumed silica, 5-10 parts of aluminum oxide, 0.5-2 parts of a sintering additive, 5-15 parts of a cross-linking agent, 0.1-0.5 part of a catalyst, 20-60 parts of a plasticizer, 0.5-1.5 parts of a tackifier and 0.1-0.5 part of a surface treating agent. The coating material does not need to be extruded at high temperature, can be vulcanized at room temperature after being applied, has the characteristics of a dense ceramic body, a stable structure, stable fireproof performance, good insulation performance and the like, and is applied to electric wires and cables; the thickness of a conventional silicon rubber fireproof layer is greatly reduced.

Description

technical field [0001] The invention relates to the field of polymer materials for electric wires and cables, in particular to a one-component room temperature vulcanized ceramic refractory silicone rubber coating material, a preparation method and an application thereof. 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, explos...

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

At the same time, the installation and laying space in these occasions is narrow, and there are strict restrictions on the structural size of the cable. The existing technology cannot meet these requirements at the same time.

The above-mentioned processing method, in addition to the deficiencies mentioned, can not meet the restrictions on the structural size of the cable: for the fire-resistant cable wrapped with mica tape, the mica must reach a certain thickness to ensure that it has fire resistance, and There must be a sheath after wrapping, and both the wrapping process and the sheath processing increase the outer diameter of the cable; the fire-resistant cable with magnesium oxide mineral insulation, inorganic magnesium oxide as insulation, and the thickness of seamless copper tubes are large and rigid , it is not practical in a narrow space. Extruded silicone rubber and ceramic silicone rubber also need a larger extrusion thickness to ensure the smoothness and smoothness of the extruded package.