polyurethane adhesive and epoxy adhesive which is less toxic

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. However, after the two are fully cured, they are basically non-toxic, so it is not clear which type of toxicity is even smaller, and it can only be said that the application is slightly different.

Question 2, what are the advantages and disadvantages of the above two?

Polyurethane adhesives have a slightly lower bond strength and tend to yellow, but have higher abrasion resistance and toughness. One-component polyurethane adhesives can be moisture cured at room temperature, requiring lower conditions. Epoxy adhesives have higher bond strength and shear strength, and have a wide range of applications. In addition to polyolefin materials, they can bond most materials and have the name of Wannengjiao. One-component epoxy adhesives require higher temperatures and may require heating or special handling.

Question 3: What adhesives can be used for bonding metals?

Adhesive metals can also be used with acrylic adhesives, as well as less unsaturated Polyester adhesives.

Fourth: In which areas are these two kinds of glue applied?

There are many cross-cutting areas between the two, such as the bonding of wood, stone, metal, and fiberglass in building materials. The former can be selected for high toughness requirements, for example, the footwear industry is used for the bonding of shoe soles. Epoxy adhesives can be used for high strength requirements.