Epoxy modified polyurethane base adhesive composition and heat-cured sticking sheet

Abstract

The invention relates to an epoxy modified polyurethane base adhesive composition and a heat-cured sticking sheet. The epoxy modified polyurethane base adhesive composition is prepared from the following components in percentage by mass: 60 percent to 80 percent of an epoxy modified polyurethane copolymer, 5 percent to 15 percent of tackifying resin, 2 percent to 8 percent of a latent curing agent, 2 percent to 8 percent of a heat curing agent, 0.2 percent to 2 percent of a heat curing accelerant, 1 percent to 10 percent of a filling agent and 5 percent to 15 percent of a diluting agent. The epoxy modified polyurethane base adhesive composition provided by the invention can be cured and molded through moisture under a room-temperature condition to prepare the heat-cured sticking sheet; when the heat-cured sticking sheet is used for sticking a rear-view mirror base, the rear-view mirror base can be rapidly positioned; shape change and displacement phenomena do not occur in a subsequent high-temperature heating process of the sticking sheet; the sticking sheet also has excellent anti-vibration performance.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to an epoxy-modified polyurethane base adhesive composition and a thermosetting bonding sheet. Background technique [0002] An important link in the assembly process of the front windshield of common vehicles such as cars, buses, and long-distance buses in daily life is the assembly of the rearview mirror. Position bonding. [0003] At present, the adhesive used for positioning and bonding the base of the rearview mirror is generally a two-component epoxy adhesive. There are two common processes for these two-component epoxy adhesives used in rearview mirrors: the first one is to mix the two-component adhesive thoroughly and apply it on the base of the rearview mirror, and then press it by hand for a short time. , so that it can be initially cured and positioned. After the base glue is completely cured, the windshield will go through a high-temperature drying tunnel at 130-150°...

AI Technical Summary

Problems solved by technology

Both of these two processes have the problems of long bonding time and low processing efficiency, and the former processing method also has the risk of high temperature displacement of the rearview mirror base

In addition, the existing two-component epoxy adhesives often show considerable brittleness due to the use of epoxy resin systems, and are prone to brittle failure when subjected to long-term shocks during driving; in addition, two-component epoxy adhesives Adhesives also have the disadvantages of low bonding strength and poor vibration resistance

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