有机硅改性复合软段水性聚氨酯的制备及性能研究

Preparation and performance study of silicone modified composite soft segment of waterborne polyurethane

以羟基氟硅油(FSiO)为原料,亚麻油酸-环氧二元醇(LA-ER)、聚丙二醇-1000(PPG-1000)为复合软段,异佛尔酮二异氰酸酯(IPDI)、二苯基甲烷二异氰酸酯(MDI)为复合硬段,乙二胺基乙磺酸钠(CA-95)为亲水扩链剂,制备了一种新型水性聚氨酯(WPU-SiF)乳液。探讨了FSiO的掺量对WPU-SiF乳液性能的影响。研究结果表明:(1)红外光谱分析证实,FSiO成功接入了水性聚氨酯(WPU)中,合成了目标产物WPU-SiF。(2)随着FSiO掺量的增加,WPU-SiF乳液的平均粒径逐渐增加,固含率逐渐减少,黏度逐渐减少;乳液的常温稳定和冻融稳定性均较好,高温稳定性也得到提高。(3)随着FSiO掺量的增加,涂层的铅笔硬度总体趋势呈现减小,光泽度呈略微增大趋势,表干时间逐渐延长,涂层的水接触角呈先升高、后降低的趋势,胶膜的拉伸强度也呈增大趋势,胶膜的断裂伸长率呈现先升后降的态势。当FSiO掺量为5%时,WPU-SiF胶膜的疏水性能较好,胶膜的水接触角为78.46°。(4)综合考虑,当FSiO掺量为5%时,WPU-SiF乳液的综合性能较佳。

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.