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以聚四氢呋喃-氧化丙烯二醇(Ng210)为软段,异佛尔酮二异氰酸酯(IPDI)为硬段,以1,2-二羟基-3-丙磺酸钠(DHPS)和二羟甲基丙酸(DMPA)作为亲水扩链剂,采用自乳化法合成了一系列高固含量聚氨酯乳液,对乳液三维微观粒子形貌和电导性能进行了研究。结果表明:所得乳液的粒子呈球形,粒径随着DHPS/DMPA比值的增大逐渐减小,随着固含量的增大,单位体积粒子数目显著增多;随着DHPS/DMPA比值增大,乳液的电导率逐渐增大;随着CaCl2溶液加入体积量的不断增多,乳液体系的电导率呈先减小后增大的变化趋势;随着HCl加入量的增多,乳液的电导率先缓慢增大,然后再急剧增大;随着乳液不断被稀释,体系电导率逐渐降低,但不呈直线减少。
Using polytetrahydrofuran-oxypropylene glycol (Ng210) as soft segment and isophorone diisocyanate (IPDI) as hard segment, 1,2-dihydroxy-3-propanesulfonate (DHPS) and dimethylol Propionic acid (DMPA) as a hydrophilic chain extender, a series of high solids polyurethane emulsions were synthesized by self-emulsification method. The morphology and conductivity of the three-dimensional micro-particles of the emulsion were studied. The results showed that the particle size of the emulsion was spherical and the particle size decreased with the increase of DHPS / DMPA ratio. With the increase of solid content, the number of particles per unit volume increased significantly. With the increase of DHPS / DMPA ratio, The conductivity of the emulsion system first decreases and then increases with the increase of the volume of CaCl2 solution. With the increase of the amount of HCl added, the conductivity of the emulsion increases slowly first, And then sharply increased; with the continuous dilution of the emulsion, the conductivity of the system gradually decreased, but not linearly decreased.