水性聚氨酯是聚氨酯颗粒作为分散相分散在连续相中的胶体体系，所以水性聚氨

Aqueous polyurethane is a colloidal system in which polyurethane particles are dispersed as a dispersed phase in a continuous phase. Therefore, the aqueous polyurethane is relative to solvent-based polyurethane, which uses organic solvent as the dispersed phase. Waterborne polyurethane can be divided into polyether type, polyester type and polyether and polyester hybrid type according to different synthetic monomers. The synthesis of waterborne polyurethane is generally divided into two stages. The first stage is the pre-polymerization stage, where polyether or polyester diol, diisocyanate, chain extender, hydrophilic monomer, etc. are pre-polymerized to form a prepolymer; The second stage is to disperse the prepolymer in water for emulsification. Solvent-based polyurethanes are more harmful to the human body and the environment because they contain non-volatile organic solvents and free isocyanates during use. Compared with solvent polyurethane, waterborne polyurethane has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. It has become an important direction for the development of polyurethane industry. It is widely used in coatings, adhesives, fabric coatings and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface treatment agents.

Water-based polyurethane is a colloidal system in which polyurethane particles are dispersed in continuous phases, so water-based polyurethanes are relative to solvent-based polyurethanes, which are dispersed phases with organic solvents. Water-based polyurethanes can be divided into polyether type, polyester type and polyether, polyester hybrid type according to synthetic monomer. Water-like polyurethane synthesis is generally divided into 2 stages, the first stage is pre-progressive polymerization stage, polyether or polyester glycol, diisocyanate, chain expander, hydrophilic monomer, etc. to pre-polymerize the production of pre-polymerization; The second stage is to emulsify the pre-concentration dispersed in water. Solvent-based polyurethane in the process of use because it contains non-volatile organic solvents and isocyanate in a free state and greater harm to human beings and the environment. Compared with solvent polyurethane, water-based polyurethane has the advantages of non-polluting, safe and reliable, excellent mechanical performance, good compatibility and easy modification, which has become an important direction of polyurethane industry development. It is widely used in coatings, adhesives, fabric coatings and finishing agents, leather coating agents, paper surface treatment agents and fiber finishers.

Waterborne polyurethane is a colloidal system in which polyurethane particles are dispersed in continuous phase as dispersing phase, so waterborne polyurethane is relative to solvent based polyurethane, and solvent based polyurethane uses organic solvent as dispersing phase. Waterborne polyurethane can be divided into polyether type, polyester type and polyether polyester mixed type according to different synthetic monomers. The synthesis of waterborne polyurethane is generally divided into two stages. The first stage is pre step polymerization, in which polyether or polyester glycol, diisocyanate, chain extender and hydrophilic monomer are pre polymerized to form prepolymer; the second stage is to disperse prepolymer in water for emulsification. Solvent based polyurethane is harmful to human body and environment because it contains nonvolatile organic solvent and free isocyanate. Compared with solvent polyurethane, waterborne polyurethane has many advantages, such as no pollution, safe and reliable, excellent mechanical properties, good compatibility, easy modification and so on. It is widely used in coating, adhesive, fabric coating and finishing agent, leather finishing agent, paper surface treatment agent and fiber surface treatment agent.<br>