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Waterborne polyurethane (WPU) dispersion medium of water , contained no or only very few organic solvents , almost no pollution to the environment , being of people of all ages . Replace solvent-based polyurethane waterborne polyurethane is an important direction of development of the polyurethane industry today . Waterborne polyurethane coating finishing, leather finishing , adhesives , architectural coatings and wood paint , and many other fields are widely used . This topic prepolymer mixing method Synthesis of the polyether-type , single - component aqueous polyurethane , and to introduce within emulsification Mechanism , in the synthesis of polyether type of waterborne polyurethane based on the use of methyl methacrylate (MMA), styrene ( St ) and methyl methacrylate (MMA) / styrene (St) composite was modified to improve the water resistance and hardness of the synthetic aqueous polyurethane . First refer to the literature data on the basis of a series of parallel experiments on waterborne polyurethane synthesis process carried out a comprehensive study . Studied the synthesis of the pre-processing of raw materials , production methods , preparation temperature synthetic polyurethane emulsion , and then get the best process for the synthesis of water-based polyurethane . Test with 1,4 - butanediol (BD0) a chain extender , 2,2 - dimethylol propionic acid (DMPA) the amount of the breaking elongation of the urethane latex properties and a coating of the water dispersion system , the water absorption impact also investigated into the impact of salinity on the emulsion properties and diisocyanate ester oligomer diols impact on the physical and mechanical properties of the coating . To further improve the water resistance and hardness of the synthetic water - based polyurethane coating synthetic aqueous polyurethane coating , thereby improving abrasion resistance, and in the synthesis based on the aqueous polyurethane , respectively, use of methyl methacrylate (MMA), styrene ( St ) and methyl methacrylate (MMA) / styrene (St) composite waterborne polyurethane modified research , exploring the modified monomer , triggering agents, emulsifiers and additives on the synthesis of waterborne polyurethane emulsion properties of water dispersion system and the influence of the elongation at break of the coating film , water absorption , synthesis and modified waterborne polyurethane heat resistance , the molecular structure was analyzed by thermogravimetric and infrared characterization . Prepared on the basis of analysis and comparison of the better overall performance of waterborne polyurethane modified and synthetic modified waterborne polyurethane formulations and reaction conditions , and to provide a basis for industrial production .
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