Ethyl lactate-removed silicone adhesive and preparation process thereof

Abstract

The present invention relates to the technical field of sealants, particularly to an ethyl lactate-removed silicone adhesive and a preparation process thereof. The ethyl lactate-removed silicone adhesive comprises the following raw materials by weight: 38%-80% of a base adhesive, 5%-20% of a plasticizer, 10%-50% of a filler, 2.0%-8% of a cross-linking agent, 0.5%-2.0% of an adhesion promoter and 0.05%-0.5% of a catalyst, wherein the base adhesive is polydimethylsiloxane which is hydroxyl-terminated polydimethylsiloxane, and the cross-linking agent comprises silane containing an ethyl lactate functional group. The ethyl lactate-removed silicone adhesive provided by the invention has good sealing property, strong adhesion and high elongation, and is free of toxicity, corrosivity and swelling, simple and convenient to prepare and stable in storage.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a delactic acid silicone glue and a preparation process thereof. Background technique [0002] Silicone glue is a part of organic silicon materials. Mainly divided into deacetate type, dealcohol type, deamination type, deacetone type. Among them, the deacidified RTV silicone rubber is one of the earliest products used in the market. The deacidified RTV silicone rubber has high vulcanization activity and has good adhesion to many metal and non-metal materials, especially to glass. The adhesiveness is excellent, and it is widely used in building sealing, but because of the acetic acid released during the vulcanization process, it has a strong pungent smell and is corrosive to metal materials, so its application is limited; deoxime type silicone The adhesive has excellent adhesion to various materials, and the technology is mature, but during the vulcanization process, unpleasant...

AI Technical Summary

Problems solved by technology

Among them, the deacidified RTV silicone rubber is one of the earliest products used in the market. The deacidified RTV silicone rubber has high vulcanization activity and has good adhesion to many metal and non-metal materials, especially to glass. The adhesiveness is excellent, and it is widely used in building sealing, but because of the acetic acid released during the vulcanization process, it has a strong pungent smell and is corrosive to metal materials, so its application is limited; deoxime type silicone The adhesive has excellent adhesion to various materials, and the technology is mature, but during the vulcanization process, unpleasant and irritating butanone oxime is released, and butanone oxime has certain toxicity, which poses health risks to the operator, and has certain corrosion on metal copper and PC. At present, Europe has begun to ban its use; the small molecules produced during the vulcanization process of dealcoholized silicone sealants are mainly water and alcohol, which are non-polluting, non-corrosive, and have good electrical insulation. They can be widely used in electronics, electrical appliances, new energy, and photovoltaics. industry

[0003] However, although the deacidified silicone rubber products used in the market can meet the requirements of silicone rubber for food contact with or without catalysts, the acetic acid released during the vulcanization process is very irritating and unacceptable; Silicone rubber products are made by using alkoxy-terminated polydimethylsiloxane as a polymer, and then mixing them with inorganic fillers, vinyltrimethoxysilane, coupling agents, and catalysts under dry and airtight conditions. There are problems such as dilution of harmful methanol during vulcanization