Preparation method of peelable type organosilicon pressure-sensitive adhesive

Abstract

The invention provides a preparation method of a peelable type organosilicon pressure-sensitive adhesive. The preparation method comprises the following steps: firstly, synthesizing MQ resin by adopting a water glass method; secondly, synthesizing carboxyl-terminated silicone rubber by adopting a direct equilibrium copolymerization method; and finally, mixing the MQ resin, the carboxyl-terminated silicone rubber and an organic solvent in a certain proportion and stirring evenly, adding a certain amount of catalyst, a filling material, a curing agent and a stabilizing agent and stirring evenly, heating for reflux reaction for a certain time, and cooling and vacuumizing to remove the solvent as much as possible, so as to obtain the peelable type organosilicon pressure-sensitive adhesive. The method better solves the difficult problems of high coating fragility, bad peelability, poor durability and weatherability, higher cost and the like of the conventional peelable type organosilicon pressure-sensitive adhesive product. The peelable type organosilicon pressure-sensitive adhesive has excellent storage stability, film forming property, water resistance and peelability, leaves no mark after being peeled off a base material and can be reused without losing adhesiveness.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a preparation method of a peelable silicone pressure-sensitive adhesive. Background technique [0002] With the gradual development of economy and science and technology, the demand for pressure-sensitive adhesives in industry, agriculture, transportation, medical care, national defense and civilian fields is increasing day by day, and the requirements are also getting higher and higher. The National Twelfth Five-Year Plan also clearly proposes to study high-performance, high-quality pressure-sensitive adhesives and products. Silicone pressure-sensitive adhesive occupies a particularly important position in silicone adhesives. It is composed of silicone rubber, MQ resin, crosslinking agent, curing agent and solvent. Due to the unique chemical properties of silicone pressure-sensitive adhesive, it It can meet the requirements of most industrial applications. Accord...

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Problems solved by technology

[0005] However, there are still many deficiencies in the invention patents disclosed above. For example, the peelable pressure-sensitive adhesive generally contains a relatively large amount of plasticizer and / or liquid tackifying resin. Peelable performance, but the water resistance, durability and weather resistance of the product are average, so look for a peelable pressure-sensitive adhesive with less or no plasticizer and liquid tackifying resin, which can significantly improve its water resistance, durability and weather resistance It has become a technical problem in the preparation method of peelable silicone pressure-sensitive adhesive; secondly, the existing peelable pressure-sensitive adhesive products are difficult to balance both peelability and adhesion, and few It can still have excellent peelability and sufficient adhesive performance after repeated use. The ideal peelable pressure-sensitive adhesive should be peelable from the substrate without leaving any traces and can be reused without loss. Its adhesion, even after repeated use, still has excellent peelability and sufficient adhesion; in addition, the process of the above method is complicated and the cost is high, and the peelability and adhesion of the peelable silicone pressure-sensitive adhesive However, the requirements of adhesiveness, durability and weather resistance are not up to standard, and it is difficult to apply industrially. Therefore, it is still necessary to continue to search for a peelable silicone pressure-sensitive adhesive with superior comprehensive performance and low cost and related production technologies.

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