【作者】 梁自禄；

【导师】 李再峰；

【作者基本信息】 青岛科技大学 ， 分析化学， 2005， 硕士

【摘要】 本文采用甲苯二异氰酸酯、异佛尔酮二异氰酸酯、聚酯多元醇为主要原料,制得多种自乳化型水性聚氨酯树脂。论文共分为4部分:(1)探索水性聚氨酯的合成工艺;(2)采用环氧树脂对水性聚氨酯进行改性,讨论其对乳液及成膜性能的影响;(3)采用聚丙烯酸树脂对水性聚氨酯进行改性,讨论聚丙烯酸的加入对乳液和成膜性能的影响;(4)对聚氨酯电泳涂装工艺进行探讨。 第一部分系统的研究了亲水剂反应温度、初聚NCO/OH比例、封端剂及其引发剂类型和引发条件对乳液及成膜性能的影响。研究结果表明:亲水性扩链剂的用量越多,乳液的粒径越小,粘度越大,漆膜的耐水性越差;漆膜的硬度随分子链中硬链段质量增加而增加;中和剂的用量越多,粒径越小,粘度越大,外观越透明,漆膜的耐水性越差;封端型聚氨酯电泳漆的漆膜性能明显优于未封端的树脂。 第二部分采用环氧改性水性聚氨酯。研究环氧树脂的含量对乳液及膜性能的影响。结果表明,与改性前的水性聚氨酯相比较,涂膜的耐水、耐溶剂性能以及电泳膜的硬度光泽度得到了提高。 第三部分针对水性聚氨酯耐水、耐溶剂性差、硬度低等缺点,采用了丙烯酸改性聚氨酯的方法。与改性前相比,乳液和膜的性能得到改善。 第四部分对电泳涂装温度、电压、时间、极间距和中和程度对阴极聚氨酯电泳漆涂装工艺的影响进行了探讨,优化了阳离子聚氨酯电泳漆的涂装工艺参数。当电压为40V,温度为30℃,电泳时间60s,中和程度100%,极板间距为150mm时,电泳漆膜较为理想。更多还原

【Abstract】 In this dissertation, the synthesis of vvaterborne polyurethane resins and relative properties were studied。 It consists of four main parts of (1) the preparation process of waterborne polyurethane, (2) modification of water-based polyurethane dispersion by the epoxy.resin and the influence of epoxy on the property of water-based PU dispersions, (3) modification of water-based polyurethane dispersions by aerylate and the effect of acrylate on the performance of PU dispersion, (4) the effect of electrophoresis process parameters on the performance of water-based polyurethane coating.First, we discussed the effects of process variables such as initial NCO/OH(R index)、 reaction temperature of hydrophilic extender capping reagents and initiators etc. on the performance of water-based polyurethane resins. The results showed that the hardness of film became harden with increasing of wt% of NCO group, and while increasing concentration of DMPA, the size of particle became smaller, viscosity of PU electrolyte resin increase, water resistant became weak. When netrolization degree of TEA is 0.75, the properties of the film is most desirable. The performance of the blocked water-based polyurethane coating was belter than that of the non-blocked water-based polyurethane coating.Second, the preparation of water-based polyurethane dispersions modified by epoxy resin was studied. The results showed that with increasing of the epoxy resin content, the water resistance, solvent resistant, the rigidity and shine of the electrophoretic film were improved significantly.Third, in order to overcome the poor solvent resistance, water resistance and hardness of the waterborne polyurethane dispersion, the aerylate was used to modify the structure of the water-based polyurethane, the performance of the water-based更多还原