新型溶剂型丙烯酸酯压敏胶的制备及交联固化研究

【作者】 马晶；

【导师】 王新龙；

【作者基本信息】 南京理工大学 ， 化学工艺， 2008， 硕士

【摘要】 本文以丙烯酸酯为主要单体,采用自由基溶液聚合法,合成了无甲苯溶剂型丙烯酸酯压敏胶。对溶剂、引发剂、单体的配比、改性单体及反应时间对压敏胶性能的影响进行了研究。结果表明,以乙酸乙酯做溶剂时,体系的粘度较大,反应速度较快,过氧化苯甲酰作引发剂,采用分批加入的方式,用量为单体总质量的0.5%,反应温度为76℃,丙烯酸丁酯与丙烯酸异辛酯的比例为4:1,改性单体丙烯酸的用量为单体总质量的3.2%时,聚合反应最佳。用对甲苯磺酸和不同的胺合成了封闭型酸催化剂,用于丙烯酸酯压敏胶的交联。研究了催化剂在不同溶剂中的溶解性,通过红外谱图分析表征了分子结构,采用TG热分析手段研究了其稳定性。重点研究了丙烯酸酯压敏胶的交联过程,通过加入不同的交联剂,金属盐和蜜胺甲醛树脂来提高压敏胶的性能,并用IR、DTA分析交联机理及固化程度。结果表明,以醋酸镁作交联剂时,醋酸镁的最佳用量为单体总质量的1.5%,交联温度为90℃,交联时间为2min;以蜜胺甲醛树脂做交联剂时,在高温条件下才能较快发生交联,加入催化剂可以降低交联温度,加快反应速率,使用封闭型酸催化剂时,蜜胺甲醛树脂的最佳用量为单体总质量的2%,交联温度为90℃,交联时间为2min。研究了抗氧剂2246的用量对压敏胶性能的影响,结果发现,用量为单体总质量的1%时,抗氧效果最好;对比了单一主抗氧剂2246与主抗氧剂2246和辅抗氧剂168复合体系抗氧效果,结果表明,复合体系的抗氧效果优于单一主抗氧剂体系。更多还原

【Abstract】 Non-toluene acrylic pressure-sensitive adhesive was synthesized by radical solution polymerization from acrylic derivatives. The effects of the solvent, initiator, the ratio of monomer, modified monomer and reaction time on the properties of the pressure-sensitive adhesive were studied. The results showed that the system appeared high viscosity and fast reaction rate in solvent ethyl acetate, the best polymerization was achieved when benzoyl peroxide used as initiator, the amount of initiator was 0.5% of the total mass of the monomer, the reaction temperature was at 76℃, the mass ratio of butyl acrylate and 2-acrylic ester was 4:1, the amount of acrylic monomers was 3.2% of the total mass of the monomer.Several closed acid catalysts were synthesized by 4-methylbenzenesulfonic acid and different amines. The solubility of catalysts in different solvents were investigated, the catalysts were characterized by FT-IR and their stability were analyzed by TG.The research focused on the cross-linking of acrylic pressure-sensitive adhesive, properties of acrylic pressure-sensitive adhesive was improved by adding different kinds of cross-linker, metal salts and melamine formaldehyde resin, and the cross-linking mechanism were analyzed by IR and DTA. The results showed that the best dosage was 1.5% of the total mass of monomers using magnesium acetate as cross-linker, cross-linking temperature was 90℃, cross-linking for 2 min. Faster reaction was achieved only at high temperature using melamine formaldehyde resin as cross-linker, but the addition of catalyst lowed cross-linker temperature, and accelerated the reaction rate. The best dosage was 2% of the total mass of the monomers using closed acid as catalyst, cross-linking temperature was at 90℃, cross-linking for 2 min.The effect of the amount of antioxidant 2246 on the properties of pressure-sensitive adhesives was studied. The results showed that the best antioxidant effect was gained when the amount of antioxidant 2246 was 1 % of the total mass of the monomers. Compared the antioxidant effect of single anti-antioxidant 2246 with the complex system of anti-antioxidant 2246 and auxiliary anti-antioxidant 168, the results showed that the complex system have better effects than single main antioxidant system.更多还原