水性丙烯酸酯树脂的相反转法制备及性能研究

发布时间：2018-03-18 17:35

本文选题：水性丙烯酸酯树脂　切入点：相反转法　出处：《复旦大学》2011年硕士论文　论文类型：学位论文

【摘要】：随着环保和降低VOC的要求日益提高,高性能水性树脂的制备及应用成为涂料、胶粘剂、油墨等行业的研究热点。本论文采用自由基聚合方法制备CPP/丙烯酸酯聚合物,通过水稀释-相反转方法获得水性聚合物空心微球、PP塑料用水性丙烯酸酯树脂,并对水性聚合物空心微球的形成机理及水性树脂的性能进行了探索,水性树脂与PP塑料基材附着力好,可取代传统的溶剂型树脂应用于低极性塑料表面保护。具体研究内容及结果如下： (1)通过一种简单相反转法合成了聚合物空心微球。以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和丙烯酸(AA)、氯化聚丙烯(CPP)等为原料,在丁酮等少量溶剂存在下自由基聚合原位接枝带有亲水基团的疏水聚合物CPP,加胺中和聚合物链上的羧基,并逐步加水直至相反转,直接获得水性聚合物空心微球分散液。实验结果表明,CPP与聚丙烯酸酯产生相分离,在微球内部引入亲水区域,加水相反转,亲水区域溶解是产生聚合物中空结构的直接原因。丁酮溶剂与水半混溶,将外部水引入到微球内部产生亲水性空腔。亲水性单体AA含量对微球形态起决定性作用,AA含量较低时得到多孔结构,当AA含量较高时得到空心微球结构,这是由于AA用量决定了不完全或完全相分离。 (2)以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和甲基丙烯酸(MAA)、氯化聚丙烯(CPP)等为原料,在溶剂存在下自由基聚合制备CPP/聚丙烯酸酯聚合物,加胺中和并加水相反转,制备聚丙烯塑料用水性CPP/丙烯酸酯聚合物树脂。采用光学显微镜、SEM.XPS、接触角分析仪等表征了CPP、共溶剂等对水性丙烯酸酯树脂稳定性、涂层与PP塑料表面自由能及附着力等的影响。实验发现,在水性CPP/丙烯酸酯聚合物树脂中,共溶剂对水性体系的稳定性有影响,共溶剂选择不当,CPP在体系中析出产生相分离,降低涂层与PP塑料的附着力。水性树脂的组成、共溶剂等对涂层表面自由能大小均有影响,也会影响涂层与塑料基材的附着力。表面能较低的涂层在PP基材的附着力较好。
[Abstract]:With the increasing requirement of environmental protection and reducing VOC, the preparation and application of high performance waterborne resin has become a hot research topic in coatings, adhesives and inks. In this paper, CPP/ acrylate polymers were prepared by free radical polymerization. Waterborne acrylate resin for waterborne polymer hollow microspheres (PP) was obtained by water dilution and reverse conversion method. The formation mechanism of waterborne polymer hollow microspheres and the properties of waterborne resins were explored. Waterborne resin has good adhesion with PP base material, which can replace the traditional solvent resin and be used in the surface protection of low-polar plastics. The specific research contents and results are as follows:. (1) Polymer hollow microspheres were synthesized by a simple reverse conversion method, using methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA) and chlorinated polypropylene (CPP) as raw materials. In the presence of a small amount of solvent, such as butanone, the hydrophobic polymer CPP with hydrophilic group was grafted by free radical polymerization in situ, and the carboxyl group in the polymer chain was neutralized by adding amine, and gradually adding water until the reverse was changed. The aqueous polymer hollow microspheres dispersions were obtained directly. The experimental results showed that CPP was separated from polyacrylate and hydrophilic region was introduced into the microspheres. Hydrophilic region dissolution is the direct cause of polymer hollow structure. The hydrophilic cavity was produced by introducing external water into the microspheres. The hydrophilic monomer AA content played a decisive role in the morphology of the microspheres. The porous structure was obtained when the AA content was lower, and the hollow microspheres structure was obtained when the AA content was higher. This is because AA dosage determines incomplete or complete phase separation. Using methyl methacrylate (MMA), butyl acrylate (BA), methacrylate (MAA) and chlorinated polypropylene (CPP) as raw materials, CPP/ polyacrylate polymer was prepared by free radical polymerization in the presence of solvent. Waterborne CPP/ acrylate polymer resin was prepared for polypropylene plastics. The stability of CPP, co-solvent and so on was characterized by optical microscope SEM.XPSand contact angle analyzer. The influence of the surface free energy and adhesion of the coating on PP plastics. It was found that the co-solvent had an effect on the stability of the water-borne system in the water-borne CPP/ acrylate polymer resin, and the misselection of the co-solvent resulted in phase separation in the system. Reducing the adhesion between the coating and PP plastics. The composition of water-borne resin and co-solvent have an effect on the surface free energy of the coating, and will also affect the adhesion of the coating to the plastics substrate. The lower surface energy of the coating has better adhesion to the PP substrate.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TQ323.42

【引证文献】