Preparation and performance study of silicone modified composite soft segment of waterborne polyurethane
A new type of waterborne polyurethane(WPU-SiF)emulsion was prepared with hydroxyfluorosilicone oil(FSiO)as raw material,linolenic acid-epoxy diol(LA-ER)and polypropylene glycol 1000(PPG-1000)as composite soft segment,isophorone diisocyanate(IPDI)and diphenylmethane diisocyanate(MDI)as composite hard segment,and sodium ethylenediaminoethanesulfonate(CA-95)as hydrophilic chain extender.The influence of FSiO content on the performance of WPU-SiF emulsion was also discussed.The research results showed that,(1)The infrared spectroscopy analysis confirmed that FSiO was successfully integrated into waterborne polyurethane(WPU)and the target product WPU-SiF was synthesized.(2)With the increase of FSiO content,the average particle size of WPU-SiF emulsion gradually increased,the solid content gradually decreased,and the viscosity gradually decreased.The stability of emulsion at room temperature and freeze-thaw was good,and the stability at high temperature was also improved.(3)With the increase of FSiO content,the overall trend of pencil hardness of the coating decreased,the glossiness slightly increased,the surface drying time gradually prolonged,the water contact angle of the coating first increased and then decreased,the tensile strength of the adhesive film also increased,and the elongation at break of the adhesive film showed a trend of first increasing and then decreasing.When the FSiO content was 5%,the hydrophobicity of WPU-SiF adhesive film was relatively good,and the water contact angle of the adhesive film was 78.46°.(4)In comprehensive consideration,when the FSiO content was 5%,the comprehensive performance of WPU-SiF emulsion was excellent.
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