Hot-melt adhesive (Hot Glue) is a kind of plastic adhesive. Its physical state is changed with the change of temperature in a certain temperature range, and the chemical property is not changed. It is non-toxic and tasteless, and belongs to an environment-friendly chemical product. Because the product is a solid, the product is convenient to package, transport, store, solvent-free, pollution-free and non-toxic, and has the advantages of simple production process, high added value, high adhesive strength, high speed and the like.
Water-based polyurethane adhesive (PU adhesive) is a kind of adhesive which is made from water-based polyurethane as base material. It is an important kind of water-based adhesive. It has been developed rapidly in recent years with its excellent adhesion, outstanding oil resistance, impact resistance, wear resistance and low temperature resistance.
First, waterborne adhesive is a kind of environment-friendly adhesive, which is made of natural polymer or synthetic polymer as adhesive, water as solvent or dispersing agent instead of toxic organic solvent which pollutes the environment. The existing water-based adhesive is not 100% solvent-free and may contain limited volatile organic compounds as auxiliaries in its waterborne medium in order to control viscosity or liquidity.