【作者】 张琳；

【导师】 王海侨；

【作者基本信息】 北京化工大学 ， 材料科学与工程， 2010， 硕士

【摘要】 为了保护环境和节省石油资源,近年来,许多发达国家出台政策,限制溶剂型油墨在食品和医疗包装等领域的应用。水性油墨中的关键材料-一水性丙烯酸树脂连接料能够极大地影响水性油墨的质量。我国水性油墨用树脂制备技术发展缓慢,产品主要存在耐水耐碱性差、光泽度欠缺、干燥缓慢、耐剥离性差等问题。因此目前国内市场上的大部分水性油墨产品依赖进口,价格非常昂贵。本论文以甲基丙烯酸甲脂(MMA)、丙烯酸丁酯(BA)为主要单体,采用乳液聚合法合成丙烯酸树脂,合成过程中引入不同的自交联体系,使树脂在干燥过程中交联生成不溶不融的三维网络结构,提高树脂的耐水耐洗刷性。研究主要工作如下：1.合成了一种硅烷偶联剂改性的丙烯酸树脂乳液连接料。研究了乳化剂、.引发体系、合成方式、硅烷偶联剂的用量及加入方式等因素对乳液性能的影响,并应用透射电镜等分析手段,研究了聚合物的微观结构及形态。结果表明,硅烷偶联剂的使用,能够提高聚合物的耐水性,并大大提高其配制的水性油墨的耐洗刷性。2.合成了一种N-羟甲基丙烯酰胺(NAM)改性的丙烯酸树脂乳液连接料。通过研究软硬单体、丙烯酸的用量(AA)、N-羟甲基丙烯酰胺的用量对乳液及其涂膜性能的影响,确定了合成树脂的最佳配方：AA的用量为单体总质量的1%,NAM的用量为0.7%,MMA/BA(质量比)=1/1,该树脂的耐水性佳。研究表明,加入少量的成膜助剂DEE能够提高乳液的成膜性。同时实验发现,交联单体NAM只能在高温下发生反应。3.以甲基丙烯酸甲脂(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸缩水甘油酯(GMA)为单体合成乳液A,以甲基丙烯酸甲脂(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸(MAA)、甲基丙烯酰胺(MAM)为单体合成乳液B,将A、B乳液共混制备了一种双组分的丙烯酸乳液树脂,考察A、B组分对共混乳液体系的影响。研究表明,在碱性条件下,MAA和GMA能够发生迅速交联反应,MAM能够促进加速该反应的发生,在酸性条件该反应不发生。4.设计并合成了一种核壳丙烯酸乳液,以Tg高的硬单体为核,Tg低的软单体为壳,核中加入交联单体M轻微交联,壳层中掺入羧基、酰胺基等功能基团,使其在干燥过程中发生交联反应。研究发现,当交联单体M用量占核单体质量的0.5%,MAA和MAM总量占壳单体质量的1%,MAA/MAM=1时,涂膜的耐水性最好。更多还原

【Abstract】 With the strengthening of environmental protection consciousness, solvent ink is prohibited used in food and medical wrapping printing in many developed countries. The development of waterborne ink for plastic films is slowness in our country. There are many disadvantages, such as poor in water resistance, alkali resistance, glossiness and so on. So the most water-borne ink products in our market are imported from other countries.The purpose for our work is try to break the monopoly of foreign products, and invent a kind of water-borne ink with high performance which can meet the need of markets.The most key component of water-borne ink is the waterborne binder resins which determines the peoperties of the ink. So, a kind of waterborne acrylic binder resin was synthesized in this paper. Three crosslinking reactions were used to modify this acrylic resin. The first kind of crosslinking agent used is vinyl alkoxy silane coupling agent. The effect of synthesis method, the dosage and the addition manner, and the dosage of emulsifier on properties of the emulsion were studied. Microcosmic structure and morphology were investigated through transmission electron microscopy. The result showed that the water resistance of the film formed from this acrylic binder resin can be improved greatly, and the wash resistance of the waterborne ink made with this emulsion can also be improved significantly. The second kind of crosslinking agent used is hydroxylmethyl acrylamide. The water absorption of film formed from this acrylic binder resin is influenced by glass transition temperature and the average particle diameter of the resin. When the amount of NAM is 0.7%, the average particle diameter is small which benefit to fabricate high performance waterborne ink is, and the performance of water resistance is very good. But NAM can not react in room temperature, it can be just used in high temperature crosslinking ink. At last, two-component crosslinking latex acrylic resins were synthesized. Among them, one of latex acrylic resin possesses epoxy groups,another lates acrylic resin possesses carboxyl groups. Once are they mixed in alkalinity condition, the epoxy group can react with carboxyl group. Thus, the performance of waterborne ink can be improved. Another find is that MAM can accelerate the reaction between epoxy group and carboxyl group.更多还原