【作者】 桂霞；

【导师】 张卫江；

【作者基本信息】 天津大学 ， 化学工程， 2007， 硕士

【摘要】 本文采用化学改性法,成功开发了一种水性环氧树脂分散液。该分散液是以环氧树脂为母体,甲基丙烯酸、丙烯酸丁酯及苯乙烯为接枝单体,通过自由基接枝聚合,合成了一种在分子结构上既具有环氧基团,又具有亲水基团的苯丙接枝环氧树脂。通过考察引发剂种类和用量、接枝单体用量、亲水单体含量、接枝温度、中和剂的种类和用量等因素对单体接枝率、水分散液粒径、贮存稳定性和耐水性的影响,确定了接枝水性环氧树脂的最佳合成条件。结果表明:亲水单体(MAA)含量为10%,混合单体总量为环氧树脂总量的25%,接枝温度为110～120℃,反应时间为6h时,接枝率可达82.3%。研究以所制备的水性环氧树脂分散液为成膜物,与碳化硼填料进行复配,制备了一种新型水性环氧中子屏蔽涂料。通过考察固化剂、助剂、颜料体积浓度、涂层厚度等因素对涂层性能的影响,确定了水性中子屏蔽涂料的最佳配方,并探讨了水性涂料的固化成膜机理。结果表明:该涂料性能优异,与溶剂型涂料相比具有VOC含量低,毒性小、无火灾危险性、涂装简便且安全卫生,同时降低了成本,表明所研制的水性中子屏蔽涂料是一种性能优异的新型环保实用核辐射防护涂料。更多还原

【Abstract】 This paper aims at developing a kind of epoxy aqueous dispersion with excellent stability and good chemical resistance. In this paper, a kind of modified resin which had both epoxy groups and hydrophilic groups was synthesized. In the radical graft copolymerization, the epoxy resin was used as matrix, and methacrylic acid, butyl acrylate, styrene were used as graft monomers. In order to find out the optimum reaction conditions, the effects of reaction conditions such as initiators, initiators concentration, the amount of monomers for grafting, the mass ratio of hydrophilic monomer, the temperature of grafting, and neutralization reagent were studied. The results showed that when the10% of MAA, 25% of the mixed monomers, 110～120℃of grafting temperature, 6h of reaction time, the grafting ratio can reach to 82.3%.The waterborne epoxy neutron shielding is a kind of radiation-proof coating which consists of boron carbide powder and the modified waterborne epoxy emulsion. The influences of curing agent、pigment volume concentration (PVC) and coating thickness on the features of the coating are discussed. The curing mechanism of the waterborne epoxy radiation-proof coating is described. The specimens coated with the modified coating were examined by routine property testing. Problems occurred in coating process and corresponding solutions are discussed. The optimum formulation of the waterborne epoxy experiment was studied. Research results show that coating is determined by the waterborne epoxy radiation-proof coating of double-package has excellent performance, low temperature curing and environment protection.更多还原