High-strength polyurethane heat-conducting adhesive, preparation method and application thereof

Abstract

The present application relates to a kind of high-strength polyurethane heat-conducting adhesive and its preparation method and application, belong to heat-conducting adhesive technical field, to solve the tensile strength, tensile shear strength, thermal conductivity coefficient and breaking elongation of the heat-conducting adhesive in the prior art cannot simultaneously satisfy excellent performance, make the battery module use process easily crack, fall off, battery cell short life and so on one of the problems.The heat-conducting adhesive of the present application adds terminal hydroxyl pre-polymer, terminal hydroxyl pre-polymer combines the advantages of polyol and isocyanate, on the one hand, due to the macromolecular soft segment of polyol, can significantly improve the breaking elongation of heat-conducting adhesive, on the other hand, introduce isocyanate, bring in the hard segment of stronger polarity, make the tensile strength, shear strength of heat-conducting adhesive significantly improve, compared with conventional isocyanate end-capped pre-polymer, it is hydroxyl end-capped, not with moisture reaction, has better storage stability.

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