High flame retardancy silicon rubber and method for preparing same

Abstract

The invention relates to preparation of silicon rubber materials, in particular to a high flame retardancy silicon rubber and a method for preparing the same. The high flame retardancy silicon rubbercomprises the following raw materials in portion by weight: 10 to 25 portions of crude rubber of which the molar content of vinyl groups is 1 percent, 60 to 100 portions of crude rubber of which the molar content of vinyl groups is 0.05 percent, 40 to 60 portions of pyrogenic silica, 5 to 10 portions of dimethyl dimethoxy silane, 10 to 100 portions of magnesium hydroxide, 10 to 100 portions of calcium bicarbonate, 10 to 30 portions of zinc borate, 1 to 3 portions of vinyl tri-methoxysilane, 2 to 6 portions of portions of titanate coupling agent, 2 to 4 portions of cerium oxide, 0 to 30ppm of platinum compound in form of platinum content, and 0 to 2 portions of phenyl inhibitor. Actual tests show that the high flame retardancy silicon rubber has good mechanical property and high-level flameretardant ability, and can reach the 94VW-1 flame retardant level of the electric wire industry.

Description

technical field [0001] The invention relates to the manufacture of silicone rubber materials, in particular to a highly flame-resistant silicone rubber and a manufacturing method thereof. Background technique [0002] Silicone rubber has many excellent properties such as good high and low temperature resistance, ozone resistance, weather resistance, insulation and production inertia, and is widely used in various fields of the national economy. Silicone rubber itself is combustible, and the oxygen index of silica-reinforced silicone rubber can reach more than 20, but under the action of an open flame, silicone rubber can continue to burn. The flammability of silicone rubber limits its application in electrical and electronic, automotive, mechanical, aerospace, underground construction and other fields. The other excellent properties of silicone rubber itself are the best choice to replace raw materials such as plastics. Therefore, it is of great significance to develop fla...

AI Technical Summary

Problems solved by technology

However, some countries in Europe and the United States have begun to strictly limit the use of halogen-containing compounds out of environmental protection considerations. To obtain good flame retardancy, nitrogen-phosphorus compounds require a large amount of addition, which seriously affects mechanical properties.

Some people use inorganic flame retardants such as hydroxides to add other additives, and the preparation can reach UL94-V0, and has relatively good mechanical properties. However, as various industries have higher and higher requirements for flame retardant levels, these flame retardant silicon Rubber can no longer meet the requirements, especially in the production of wires, it is difficult to pass the 94VW-1 test of finished wires