水性丙烯酸酯共聚物EVA表面处理剂及复膜胶的合成
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摘要
本论文以丙烯酸丁酯、乙酸乙烯酯等单体为原料,采用乳液聚合的方法合成EVA表面处理剂。研究了乳液稳定性、粘度、最低成膜温度和共聚物玻璃化转变温度(Tg)的影响因素,并研究了EVA交联程度对表面处理剂处理效果的影响。研究结果发现,反应温度75~85℃、采用半连续合成方法、丙烯腈用量小于5%、GMA用量小于1%时乳液的稳定性好;乳液粘度随着丙烯酸用量的增加而增加,反应前加入的NaOH的量越多,制备的乳液粘度越小;软单体可以降低丙烯酸酯共聚物的Tg,而Tg决定乳液的最低成膜温度,最低成膜温度的高低直接影响着表面处理剂的施工难易程度;所制备的丙烯酸酯EVA表面处理剂对交联程度低的EVA发泡鞋底具有良好的处理效果。
     本论文以丙烯酸、丙烯酸丁酯等单体为原料,采用乳液聚合的方法合成纸/塑、塑/塑和铝/塑复合的复膜胶,探讨了各种功能性单体分别对纸/塑、塑/塑和铝/塑复膜胶的粘合性能的影响。结果发现,AN对剥离强度的影响不明显;随着GMA用量的增加,纸/塑复膜胶的剥离强度呈增长的趋势,而塑/塑和铝/塑复合的剥离强度先增加后减少;随着N-羟甲基丙烯酰胺用量的增加,乳液对于塑/塑和铝/塑复合的剥离强度先大幅增加,超过0.9%时剥离强度下降较快。在反应完成后,加入少量的氧化还原引发剂,可以提高乳液的固含量和转化率,从而提高乳液的粘结性能。使用GMA作为功能性单体的时候油墨转移率比AN大。
     本论文以烯丙氧基羟丙磺酸钠等为自乳化单体,采用种子聚合的方法合成无皂乳液,研究了各种自乳化单体及其用量对无皂乳液稳定性的影响。结果表明,反应温度为83℃,HAPS的用量为单体总量的1.9%时,乳液稳定性最好。
The EVA surface treatment agent can be obtained through emulsion copolymerization by using butyl acrylate (BA), Vinyl acetate (VAc) as monomers. The influence factors of emulsion stability、viscosity、minimum filming temperature and glass-transition temperature and the influence of crosslink degree on treatment effect of EVA surface treatment agent and was investigated. The result revealed that the stability of latex is relative good when the temperature is between 75℃and 85℃, the content of AN and GMA are under 5%, and under 1% respectively. The viscosity of latex increases when the content of AA increases. Before reaction, the viscosity decreases after the dosage of NaOH mounts. Soft monomer can reduce Tg of system, the minimum filming temperature is determined by Tg, minimum filming temperature directly influence the construction of surface treatment agent. As-prepared EVA surface treatment agent had considerable surface treatment effect on medium solo of foam EVA, which crosslink degree is low.
     The Paper/Plastic、Plastic/Plastic and Al/Plastic laminating adhesive can be prepared through emulsion copolymerization by usingacrylic acid (AA), butyl acrylate (BA) as monomers. The influence of different monomers on laminating effect of Paper/Plastic、Plastic/Plastic and Al/Plastic laminating adhesive was investigated. The result indicates that the influence of AN on peeling strength is not obvious. As the content of GMA increases, peeling strength of Paper/Plastic increases, while peeling strength of Paper/Plastic and Al/Plastic decreases after increasing. When the content of N-Methylolacrylamide increases, for Paper/Plastic and Al/Plastic laminating, peeling strength of Paper/Plastic and Al/Plastic also decreases sharply after increasing. After reaction, by adding a little initiation-redox, the solid content and monomer transform ratio was increased, and then the ability of adhesion of emulsion was augmented. Printing ink transfer ratio is obvious when using GMA as monomer, while the AN can not do it.
     Emulsifier-Free Emulsion Polymerization was prepared by seeding polymerization, using selfemulsifying monomers such as HAPS. The influence various selfemulsifying monomers and their contents on Emulsifier-Free Emulsion stability was investigated. The result indicates that the stabilization of emulsion is the best when the temperature is 83℃, and the content of HAPS is 1.9%.
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