Foamed silica gel with water used as foaming agent and production method of foamed silica gel with water used as foaming agent

Abstract

The invention relates to the technical field of foamed silica gel, in particular to foamed silica gel with water used as a foaming agent and a production method of the foamed silica gel with the waterused as the foaming agent. The foamed silica gel with the water used as the foaming agent comprises an A component and a B component, wherein the A component and the B component are mixed according to a mass ratio of 1:1, the A component comprises the following raw materials in parts by weight: 180-220 parts of gas-phase method base rubber, 130-160 parts of vinyl silicone oil, 20-40 parts of water and 1-2 parts of a platinum complex; and the B component comprises the following raw materials in parts by weight: 200-250 parts of gas-phase method base rubber, 20-40 parts of vinyl silicone oil, 150-200 parts of hydrogen-containing silicone oil, 0.5-2 parts of 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane and 0.1-0.3 part of 1-ethynyl-1-cyclohexanol. According to the foamed silica gel, the water is adopted as a source of main hydroxyl groups, the water and a hydrosiloxane component are subjected to a reaction to generate foaming gas, using the water as the foaming agent is non-toxic and pollution-free for both a production environment and a final product, and especially, by using the water as the foaming agent, silicone rubber foam with super low density (0.05-0.10 g / cm<3>)can be produced.

Description

technical field [0001] The invention relates to the technical field of foamed silica gel, in particular to a foamed silica gel using water as a foaming agent and a manufacturing method thereof. Background technique [0002] Foamed silica gel is a porous polymer elastic material formed by the foaming process of silicone rubber. It is a new type of multi-functional silicone material. In addition to the excellent properties of silicone rubber itself, it also has light weight, damping effect and It has the advantages of good thermal insulation performance, and also has the advantages of high and low temperature resistance, weather resistance and environmental protection that other foam materials do not have. [0003] According to the processing and molding method, it can be divided into liquid room temperature vulcanized foam silicone rubber and high temperature vulcanized foam silicone rubber: the former is prepared by adding crosslinking agent, filler and additives to silicone...

AI Technical Summary

Problems solved by technology

[0004] At present, the main way to make liquid foamed silicone rubber is to use the chemical foaming method. The chemical foaming method refers to the use of chemical methods to generate gas to make the silicone polymer matrix foam; a foaming agent can be added to the polymer, heated Make it decompose and release gas for foaming, or use the gas released by the chemical reaction between the silicone polymer components to make foaming, such as hydroxyl-terminated polysiloxane or hydroxyl-containing alkanes and hydrogen-containing Silicone oil reacts H through SI-OH and SI-H 2 , and at the same time cross-linked with vinyl-terminated polysiloxane. In addition, an external foaming agent can be added to carry out the foaming reaction. The external foaming agent refers to a substance that can generate gas when heated, such as urea, NaHCO 3 etc., also including the gas (such as air, CO 2 , N 2 、Ar 2 etc.), but the current foamed silica gel will produce toxic and harmful substances no matter for the generated gas or the final product, and will also cause pollution to the environment