Effect Of Distribution Of Hydrophilic Groups Of PU Ionomer On Properties Of Latex And Film

Waterborne polyurethane means that medium is water not organic solvent. And now it can not match solventborne polyurethane. But waterborne polyurethane with advantages of hypotoxicity, non-burning, low-pollution, saving energy, safe reliability and abrasive resistance has also gained a large share in many applications, such as textile, leather finishing and adhesive materials and so on. The researches of waterborne polyurethane meet many questions, too. For example the effects of polyether structures and distribution of groups on properties of polyurethane latex and amphiprotic polyurethane latex are seldom studied. Therefore, this experiment carried out the studies on these three sides, effects of polyether with bisphenol A, propylene epoxide, epoxyethane and distribution of hydrophilic groups on PU latex and film and amphiprotic polyurethane latex. The chemical titrimetry, stress-strain and thermal properties of film were used to research the properties of polyurethane latex and effect of polyether structures on the polyurethane. The particle size, Zeta potential, viscosity of polyurethane latex and the trends of change that they followed pH were also confirmed by modern instruments. The results indicated that the primary hydroxyl groups of new polyether were with higher reactivity, and the special structures of polyether influenced appearance, viscosity of polyurethane latex and this polyether enhanced the mechanics property of film. Regular copolymerization of three groups of SPE polyether made outstanding effect on the electrolyte resistance of latex. The different distribution of hydrophilic groups also influenced the latex's properties greatly. To the amphoteric PU latex, electrolyte resistance, particle size, Zeta potential, viscosity and pH at isoelectric point were affected by distributional density of amphoteric ions.