Adhesive sheet and bonding method using the same

摘要

There is provided an adhesive sheet that has initial adhesiveness, can realize bonding between metals, between a metal and an organic material, and between organic materials, and can retain an excellent adhesion strength without undergoing a temperature change. The adhesive sheet comprises a first release paper, an adhesive layer, and a second release paper stacked in that order, the adhesive layer containing an adhesive, the adhesive containing at least an acrylic resin, an epoxy resin, and a curing agent, the content of the epoxy resin being 175 to 300 parts by weight per 100 parts by weight of the acrylic resin.

主权项

1. An adhesive sheet comprising: a first release paper, an adhesive layer, and a second release paper stacked in that order,
the adhesive layer containing an adhesive, the adhesive containing at least an acrylic resin, an epoxy resin, and a curing agent, the content of the epoxy resin being 175 to 300 parts by weight per 100 parts by weight of the acrylic resin, wherein the epoxy resin is a mixture of a nitrile butadiene rubber-modified epoxy resin with a bisphenol A epoxy resin, and wherein the acrylic resin is an acrylic ester copolymer selected from the group consisting of ethyl acrylate-butyl acrylate-acrylonitrile copolymers, ethyl acrylate-acrylonitrile copolymers and butyl acrylate-acrylonitrile copolymers, wherein when a laminated body is prepared by laminating two carbon fiber reinfored plastic sheets of 100 mm in length ×25 mm in width ×1.5 mm in thickness via the adhesive layer of 12.5 mm in length ×25 mm in width and curing the adhesive layer at 180° C. for one hour while applying a load of 3 kg onto the laminated body, the adhesion strength thereof is more than 12 MPa wherein the adhesive has a three-dimensional islands-sea structure comprising sea formed of the acrylic resin and islands formed of the epoxy resin.