Cause Analysis and Solution of Epoxy AB Glue Yellowing of Epoxy Resin
Epoxy resin is a kind of epoxy oligomer, which can form a three-dimensional network of thermosetting plastics when reacted with a hardener. Because of its strong adhesion, convenient curing, low shrinkage, good acid and alkali resistance, and excellent mechanical properties, it is widely used. However, epoxy products are prone to yellowing, poor weather resistance and toughness, which affect their own development. This article focuses on the problem of epoxy AB glue yellowing to discuss the causes and solutions. To solve the yellowing problem of epoxy AB glue, we first look at the composition of epoxy glue. Usually epoxy AB glue is composed of amine curing agent (polyetheramine, modified amine, aromatic amine, etc.), epoxy resin (mainly bisphenol A), accelerator, diluent, filler and other additives. The main factor of yellowing should be caused by amine curing agent, accelerator nonylphenol (NP) and bisphenol A resin. 1.Amine curing agent will not cause yellowing when [...]