DMTDA is an environmentally friendly and low toxic liquid diamine chain extender, which is mainly used on polyurethane elastomer, rim (reaction injection molding), SPUA (sprayed polyurea elastomer) and adhesive; At the same time, it can also be used as epoxy resin curing agent. It has been widely used in polyurethane cots, medicine, stamping and so on. In addition, it is widely used in automobile, construction, coal mine, metal mine, textile, papermaking and printing industries.