Preparation method of single-component transparent organic silicon sealant

Abstract

The invention relates to a preparation method of a single-component transparent organic silicon sealant. The single-component transparent organic silicon sealant is prepared from alpha,omega-dihydroxy polydimethylsiloxane, a reinforcing filler, an end-capping catalyst, an alkoxy silane crosslinking agent, a tackifier, a curing accelerator and an organic tin catalyst. The room-temperature vulcanized organic silicon sealant has the advantages of high curing speed, high transparency, high temperature resistance and high yellowing resistance, and has favorable bonding properties for metals, plastics and other substrates.

Description

technical field [0001] The invention relates to the technical field of polymer materials and their production, in particular to a preparation method of a single-component transparent silicone sealant. Background technique [0002] One-component condensation type room temperature vulcanization silicone sealant (also known as one-component condensation type room temperature vulcanization silicone rubber) is the most common and the largest amount of room temperature vulcanization silicone sealant, it is easy to use, therefore, in construction, automobile , Electronic appliances, machinery, chemical industry, light industry and other fields have been widely used. One-component condensation type room temperature vulcanizing silicone sealants can be divided into deketoxime type, dealcoholized type, acetone-free type and deamidated type according to different cross-linking agents. The current practical application in engineering is mainly deketoxime type and deacidification type o...

AI Technical Summary

Problems solved by technology

At present, the yellowing performance of one-component transparent dealcoholized room temperature vulcanized silicone sealant at high temperature still needs to be improved. Changed amine coupling agents as tackifiers, such as γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyl trimethyl Oxysilane, N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, anilinomethyltriethoxysilane, aminosilane polycondensate, etc.; in order to suppress one-component transparent dealcoholization For the yellowing of type room temperature vulcanized silicone sealants at high temperatures, some patents have adopted measures such as reducing the amount of amine coupling agents in the formula system and partially changing the chemical structure of amine coupling agents, which can inhibit the yellowing at high temperatures to a certain extent. Yellowing, but the degree of improvement is still limited

(2) One-component transparent dealcoholization type room temperature vulcanized silicone sealant catalyst mainly adopts organic titanate or organic titanium chelate (such as patent documents CN103642451A, CN102952270A, CN102604390, CN102153866A, CN102516772B, etc.); The yellowing of transparent dealcoholized room temperature vulcanized silicone sealant at high temperature, some patents reduce the amount of organic titanate or organic titanium chelate in the formulation system or partially change the chemical structure, which can inhibit high temperature to a certain extent Lower yellowing, but the degree of improvement is still limited

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