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Water based polyurethane resin, also known as water based polyurethane dispersion, water-based PU dispersion or water-based polyurethane emulsion, is a new type of polyurethane system in which water replaces organic solvent as the dispersion medium.Water based polyurethane uses water as solvent, which has the advantages of no pollution, safe and reliable, good mechanical properties, good compatibility and easy modification. Let's take a closer look at the classification of water based polyurethane emulsion.

Polyurethane emulsions can be subdivided into polyurethane emulsions and urethane - urea emulsions. The latter refers to the emulsions formed by polyurethane prepolymer dispersing in water through water or diamine chain expansion, essentially producing urethane - urea, but due to the preparation by prepolymer dispersion method is more common, traditionally known as polyurethane emulsions in the majority.
According to the molecular structure can be divided into linear molecular polyurethane emulsion (thermoplastic) and crosslinked polyurethane emulsion (thermosetting).The crosslinker type can be subdivided into internal cross - link and diplomatic - link type.The inner - coated polyurethane emulsion is a stable one - component system.Crosslinking is a two-component system in which the crosslinking agent is added to the emulsion and can react with the groups in the polyurethane molecular chain

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