以异佛尔酮而异氰酸酯、含磺酸基的聚酯二元醇、聚己二酸丁二醇酯二醇、1,4-丁二醇为原料,以叔胺型扩链剂为亲水扩链剂,将含有阴离子磺酸基的水溶性聚酯多元醇引入到阳离子性的水性聚氨酯分子结构中,制备出含有阴、阳两性离子型聚氨酯。利用红外光谱、透射电子显微镜、激光粒度分析仪、原子力显微镜、扫描电子显微镜和乳液电位分析等手段对两性离子乳液进行了分析表征,结果发现两性离子水性聚氨酯在不同 pH 值环境下具有不同的电离状态,乳液在酸性条件下,zeta电位为50．4 mV,呈现阳离子性,乳液在碱性条件下,zeta电位为－48．3 mV,乳液显示为阴离子性,说明水性聚氨酯具有阴、阳两性特征。因此两性离子型水性聚氨酯较单一离子特性的水性聚氨酯在烘干过程中更容易产生胶粒与胶粒间作用力,能够表现出更大初粘性,更适合制备水性聚氨酯粘合剂。%With isophorone isocyanate,containing sulfonic group of polyester glycol,polyethylene adipic acid butyl glycol ether glycol,1 ,4-butanediol as raw materials,to tertiary amine type chain extension agent for the hydrophilic chain extender,water-soluble polyester polyols containing a anionic sulfonic group was introduced into the cationic waterborne polyurethane molecular structure,contains Yin and Yang amphoteric ionic polyure-thane was prepared.By infrared spectroscopy,transmission electron microscope,laser particle size analyzer, atomic force microscopy,scanning electron microscopy and emulsion potential analysis method analyses the zwitterionic emulsion characterization,it is found that amphoteric ion waterborne polyurethane under different pH environment with different state of ionization,emulsion under acid condition,zeta potential of 50.4 mV, rendering,cationic emulsion in alkaline conditions,zeta potential of 48.3 mV,emulsion exhibits for the anion, that between Yin and Yang characteristics of waterborne polyurethane.Therefore,the aqueous polyurethane waterborne polyurethane amphoteric properties than a single ion in the drying process more prone force between particles and particles,can show greater tack and more suitable for the preparation of aqueous polyurethane ad-hesives.
展开▼
