A method for improving the stability of silicone pressure-sensitive adhesives for protective films

A silicon pressure-sensitive adhesive and protective film technology, applied in the direction of adhesives, etc., can solve problems such as viscosity and other performance changes gradually, cannot meet the use requirements, and use performance is unstable, so as to achieve good use performance, convenience and practicality Performance, stable temperature resistance and storage performance
CN105441017BActive Publication Date: 2018-07-17ANHUI MINGXUN NEW MATERIAL TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI MINGXUN NEW MATERIAL TECH
Publication Date
2018-07-17

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Abstract

The invention relates to a method for improving stability of an organosilicone pressure-sensitive adhesive for a protective film. The method comprises steps as follows: step 1), removal of water and hydroxyl: a water and hydroxyl removal agent containing organic acyloxy silane compounds is added to a reaction system to reduce water left in the adhesive and hydroxyl left on an adhesive structure; step 2), thorough inactivation of a catalyst: a) when primary amine or secondary amine is used as a condensation polymerization catalyst, an adhesive reaction system is kept at the temperature of about 70 DEG C at the nitrogen reaction atmosphere, primary amine or secondary amine and aldehydes, ketones or low-level carboxylic acid react to generate Schiff base, generated unstable Schiff base reacts with diethyl malonate, and Schiff base becomes beta-amino acid without catalytic activity; b), when secondary amine or tertiary amine is used as a condensation polymerization catalyst, acidic compounds which can react with secondary amine or tertiary amine to generate a stable compound are added to the reaction system; step 3), residual small molecular substances are removed in the vacuum state; step 4), neutralization of residual acidic compounds: sodium alcoholate is added to neutralize residual acidic compounds in the adhesive.
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Description

technical field

[0001] The invention relates to the technical field of adhesives, in particular to a method for improving the stability of silicone pressure-sensitive adhesives for protective films. Background technique

[0002] Silicone pressure-sensitive adhesives are generally a high-performance pressure-sensitive material formed by polycondensation of hydroxyl-terminated polyorganosiloxane linear polymers under the action of a catalyst and MQ silicone resin with hydroxyl groups. Because of the structure, silicone pressure-sensitive adhesives have excellent high / low temperature resistance, excellent dielectric properties and aging resistance, and have low surface free energy and can stick to the surface of difficult-to-stick objects. Therefore, it is widely used. The preparation process of silicone pressure-sensitive adhesives is quite complicated. The silicone pressure-sensitive adhesives in the prior art are often caused by reasons such as insufficient raw material sou...

Claims

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