Question one, polyurethane adhesive and epoxy adhesive which is less toxic? Polyurethane adhesive raw materials and epoxy resin adhesive materials are toxic. For example, polyurethane curing agents are mostly isocyanates, which have high activity and are harmful to people's kidneys. The organic tin in the catalyst is a poisonous or highly toxic chemical raw material. The epoxy curing agent amine curing agent is also toxic, reactive diluents are toxic or highly toxic chemical raw materials....

Epoxy adhesive is made of polyurethane prepolymer modified epoxy resin (component A) and self-made curing agent (component B) in a ratio of 10:1 to 1:1 (weight ratio) to make it resistant to high temperature and toughness. , Reactive curing system. Wherein the hydroxy terminated polyurethane prepolymer is a polysiloxane diisocyanate and a certain proportion of the isocyanate groups is made under certain conditions of the reaction-terminated polysiloxane polyurethane prepolymer, the polyurethane...

The use of adhesives by humans has been known for thousands of years. However, epoxy adhesives have only been around for more than 50 years since around 1950. However, with the successive advancement of various adhesive theory in the middle of the 20th century, as well as the in-depth progress of basic research such as adhesive interface chemistry, adhesive rheology, and adhesive destruction mechanism, the performance, variety, and application of adhesives have advanced by leaps and bounds....

1. High-strength. General epoxy resin structure containing hydroxyl, ether bond makes it have high adhesiveness, due to these polar groups, it can make the adjacent interface to generate electromagnetic force, less in the curing process, with the curing agent . The chemical action can further generate the radical and the ether bond, which not only has a high cohesive force but also generates a strong adhesion force. Therefore, the epoxy adhesive is different from many kinds of materials which...