There are several types of organic silicone adhesives, such as high temperature resistant adhesives, heat resistant sealants, high temperature resistant strain adhesives and heat resistant pressure sensitive adhesives.
Polyorganosiloxane is a linear polymer composed of silicon atoms and oxygen atoms alternately. After cross-linking and vulcanization, it has excellent high and low temperature resistance, atmospheric aging resistance, electrical insulation and elasticity. It can be used for a long time in the range of -60 ~ 200 ℃, and its physical and mechanical properties rarely change, so it is widely used in construction, electronics, automobiles, packaging, medical and health industries, showing an excellent development momentum. Silicone adhesives and seals The use of glue is constantly expanding, and the variety and dosage are also increasing year by year.

The siloxane in the silicone resin can react with compounds containing hydroxyl groups, such as epoxy, phenolic and polyunityl, so these compound resins can be used to modify the silicone adhesive.

The silicone adhesive with pure silicone resin as the main material is generally made of xylene as the solvent and adding inorganic fillers, such as asbestos powder, mica powder, chromium dioxide and zinc oxide. It is cured by cross-linking and polymerization at high temperature (270°C), has excellent high temperature resistance, can be used for a long time at 400°C, and is suitable for non-structural bonding and sealing at high temperature. Pure silicone resin adhesives are inconvenient to use due to high curing temperature, and the bonding strength is not high, so they can only be used as non-structural adhesives. The one OH in epoxy, phenolic and polyester can react with siloxane in silicone resin to introduce this kind of resin for modification, which can not only maintain the high temperature resistance of silicone resin adhesive, but also reduce its curing temperature and improve the adhesive strength. connection strength.


Disclaimer: The content contained in this article comes from public channels such as the Internet and WeChat public accounts. We maintain a neutral attitude towards the opinions in the article. This article is for reference and communication only. The copyright of the reproduced manuscript belongs to the original author and institution, if there is any infringement, please contact us to delete