A kind of preparation method of polyurethane pressure-sensitive adhesive composition and protective film

Abstract

The invention relates to a preparation method of polyurethane pressure-sensitive adhesive composition and a polyurethane protective film. The preparation method is characterized by including 1000 parts of polyether polyol, 100-400 parts of modified isocyanate, 0.01-1 part of a catalyst, 0.05-10 parts of an antistatic agent and 500-2000 parts of solvent. The above mentioned components are mixed and coated on a substrate, and the polyurethane protective film with good performance can be obtained through first-step reaction at a temperature of 60 DEG C-130 DEG C. The provided preparation method of a polyurethane formula and the polyurethane protective film saves the previous prepolymerization process, raw material monomer is directly used in the process of catalytic reaction polymerization, cross-linking and soliding and forming, the rate of film formation is 100%, a large number of cost and time are saved, accuracy control of the protective film with stable quality is achieved, a configured tackiness agent mixed liquor can be stored at room temperature for a long time and certainly can be used immediately, and the operable time in a coating process is greatly extended.

Description

Technical field [0001] The invention relates to the field of polyurethane protective films, in particular to an antistatic polyurethane pressure-sensitive adhesive composition and a preparation method of the protective film. Background technique [0002] Since the catalyst promotes the crosslinking and curing of other components of the adhesive, and the adhesive is not immediately coated on the protective film layer as soon as it is formulated, the existing polyurethane pressure-sensitive adhesive protective film usually adopts pre-polymerization. To produce the adhesive, in order to ensure the polymerization of the adhesive and the quality of the coating on the protective film, the adhesive needs to add a large amount of crosslinking agent during the pre-polymerization process. Before coating, a curing catalyst needs to be added to the pre-polymerized adhesive to ensure the curing speed and the degree of cross-linking during the later coating. [0003] After the secondary curing,...

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Problems solved by technology

[0003] After secondary curing, the polyurethane protective film is obtained, and the performance drops significantly in the later stage, which reduces the adhesion between it and the film layer; moreover, due to the difference in the electrical properties of the polyurethane adhesive itself, it is easy to produce in the process of producing and using the protective film. Static electricity, but since the antistatic agent is added to the pre-polymerized adhesive together with the cross-linking agent during the later coating, since most of the active groups have participated in the cross-linking reaction during the pre-polymerization of the adhesive, the second time of coating Cross-linking and curing only a small part of cross-linking, the degree of cross-linking is low, and the antistatic agent cannot be stably coated in the adhesive layer by chemical bonding. It is difficult to match the adhesive with the antistatic agent, and it is difficult to Medium antistatic components are easily precipitated from the adhesive layer, resulting in low pollution performance of the protective film

At the same time, the method of step-by-step operation in the existing technology is not only complicated in the process of synthesizing the membrane, but also needs to control the preparation time and preparation process, which has certain technical requirements for the factory operators, resulting in a significant increase in production costs

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