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, peelable pressure-sensitive adhesives generally contain relatively large amounts of plasticizers and / or liquid tackifying resins , which is a component that brings pressure-sensitive adhesives with good peelability, but the product's water resistance, durability and weather resistance are average, so look for plasticizers that contain less or no plasticizers and liquid tackifying resins. Peel off the pressure-sensitive adhesive, significantly improve its water resistance, durability, weather resistance and peelability, and become a technical problem in the preparation method of peelable silicone pressure-sensitive adhesive; secondly, the existing peelable pressure-sensitive adhesive products , its detachability and adhesiveness are difficult to balance at the same time, and few of them can still have excellent detachability and sufficient adhesive performance after repeated use. After peeling off without leaving any traces and can be reused without losing its adhesiveness, it still has excellent peelability and sufficient adhesion even after repeated use; in addition, the process of the above method is complicated and the cost is high , the peelability, adhesion, durability and weather resistance requirements of the peelable silicone pressure sensitive adhesive are not up to the standard, and it is difficult to apply industrially. Type silicone pressure-sensitive adhesive and related production technology

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