A kind of alkoxy-terminated dealcoholized silicone sealant and preparation method thereof

Abstract

The invention discloses an alkoxyl end-capped dealcoholized silicone sealant and a preparation method thereof. The alkoxyl end-capped dealcoholized silicone sealant comprises the following components in parts by weight: 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane, 10-20 parts of an end-capped polymer, 3-5 parts of an end capping catalyst, 15-20 parts of a titanate coupling agent, 50-80 parts of a reinforcing agent, 5-10 parts of a crosslinking agent and 5-8 parts of a tackifier. The alkoxyl end-capped dealcoholized silicone sealant is prepared through the steps of end capping treatment, purification treatment and mixing. The method has the advantages that alkoxyl end capping is performed on a reaction polymer, so that the storage stability of the sealant is enhanced, and the storage time is over 12 months; the conditions of an end capping reaction are mild, the end capping efficiency is high, and continuous production is available; the generated alkoxyl end-capped dealcoholized silicone sealant has excellent mechanical properties, and can meet the requirements of electronic-grade products.

Description

technical field

[0001] The invention relates to the technical field of sealants, in particular to an alkoxy-terminated dealcoholized silicone sealant and a preparation method thereof. Background technique

[0002] Silicone sealant has deacidification type, dealcoholization type and deketoxime type, among which dealcoholization type sealant has neutral properties, clean, non-toxic, non-corrosive, low cost and price, and adheres to glass and metal and other materials. Good connection performance and other advantages. In recent years, with the rapid development of the electrical and electronic industry, dealcoholized silicone one-component sealant (RTV-1) has been favored by industry applications and researchers because of its above-mentioned performance advantages. However, most of the dealcoholized silicone one-component sealants currently on the market use hydroxyl-terminated silicone as raw materials for preparation, such as 107 silicone oil, α,ω-dihydroxy polydimethylsilo...