Organic silicon hydrogen-containing tackifying crosslinking agent for addition type silicon rubber and preparation method thereof

Abstract

The invention belongs to the technical field of a tackifying crosslinking agent, and particularly relates to an organic silicon hydrogen-containing tackifying crosslinking agent for addition type silicon rubber and a preparation method thereof. The tackifying crosslinking agent is prepared by performing addition reaction on high-hydrogen-content silicon oil or D4H and vinyl cyclohexene oxide or allyl glycidyl ether and then adding inhibitors. The process is simple; the reaction conditions are mild; the therepeatability and the controllability are good; the impurities in the reaction process are few; organic solvents are not used; the environment is protected; no pollution is caused. The obtained tackifying crosslinking agent has the stable performance; the tackifying and crosslinking effects can be achieved at the same time. The compatibility with silicon rubber is good; no catalyst poisoning phenomenon exists; the bonding performance of the addition type silicon rubber with metal suchas copper foil can be obviously improved; in addition, the refractive index of the organic silicon hydrogen-containing tackifying crosslinking agent is adjustable and controllable in a range of 1.40to 1.55, so that the tackifying crosslinking agent is applicable to the silicon rubber with (high and low) different refractive indexes.

Description

technical field [0001] The invention belongs to the technical field of viscosifying crosslinking agents, and in particular relates to a silicone hydrogen-containing viscosifying crosslinking agent for addition-type silicone rubber and a preparation method thereof. Background technique [0002] The curing methods of silicone rubber mainly include thermal vulcanization, condensation curing and addition curing. Among them, the silicone rubber prepared by addition curing method has small shrinkage rate, fast curing speed and high mechanical strength. Therefore, addition silicone rubber is widely used in industries such as automobile, electronics, power supply and LED packaging. However, there is no polar group on the main chain of the silicon-oxygen bond molecule of the addition-type silicone rubber, and the molecular chain is helical and coiled, surrounded by many methyl groups, and these methyl groups have a shielding effect on the polarity of the Si-O bond. , thus rendering ...

AI Technical Summary

Problems solved by technology

However, there is no polar group on the main chain of the silicon-oxygen bond molecule of the addition-type silicone rubber, and the molecular chain is helical and coiled, surrounded by many methyl groups, and these methyl groups have a shielding effect on the polarity of the Si-O bond. , thus making the whole molecule nonpolar

This results in low surface energy of addition silicone rubbers and poor adhesion to plastic or metal substrates

[0003] At present, there are three main methods to improve the adhesion of addition-type silicone rubber: First, use a primer to treat the surface of the bonding substrate. This method increases the construction process of the primer, and on the one hand reduces production. efficiency, on the other hand the primer contains organic solvents which are toxic and flammable, thus resulting in a poor working environment

Second, the silicone rubber is modified by introducing some polar functional groups that can promote adhesion. The production process is more complicated and the cost is higher

However, this method needs to add tackifier and crosslinking agent separately in the preparation process.