【作者】 许玉芝；

【导师】 谢晖；

【作者基本信息】 南京工业大学 ， 化学工程， 2005， 硕士

【摘要】 为了得到综合性能优良的丙烯酸酯乳液压敏胶粘剂,降低压敏胶成本及提高自制增粘树脂乳液的附加值和扩大其应用范围,本论文从应用的角度出发,以丙烯酸酯类为主要单体,采用核-壳乳液聚合方法合成出一种水乳型压敏胶粘剂,并把自制的增粘树脂乳液采用共混改性的方法添加到聚合物乳液中,获得了综合性能优良的压敏胶粘剂。 文中首先合成了不同环氧乙烷聚合度的松香甘油酯聚氧乙烯醚琥珀酸单酯磺酸钠(RGEOS)阴离子表面活性剂,测定了产物的表面物化性能,其中表面张力(δ)为33.50～37.20(mN/m),临界胶束浓度(CMC)在1.00和3.60(mmol/L)之间,对松节油界面张力(V)为3.4～4.8(mN/m),钙皂分散力(LDSP)为3.2～6.4%,对松节油乳化力(EP)为202～310(S),润湿力(WP)为125～265(S),最低溶解温度(KP)小于0℃;并对环氧乙烷聚合度(n)对产物表面物化性能的影响进行了讨论:随着EO聚合度n的增加:乳化剂表面张力增加:临界胶束浓度减小;松节油-水溶液界面张力稍有下降;对松节油的乳化能力提高;钙皂分散力提高;泡沫性能变化不大。 然后采用常压熔融转相乳化法进行松香酯乳液的制备,探讨了主要影响因素如相转化过程的操作条件,乳化剂用量及添加方式等对乳液性能的影响,确定了合理的工艺操作条件:自制乳化剂用量为5%(质量)且分批加入,适宜的搅拌速度为650r/min,去离子水的滴加速度为45滴/min和乳化温度为95℃,得到了乳白细腻的松香酯乳液,其粒径为70-90nm,贮存稳定性达6个月以上。 接着运用核—壳聚合方法合成丙烯酸酯乳液压敏胶,探讨了种子含量、引发剂、乳化剂、相比等因素对丙烯酸酯乳液压敏胶粘剂体系性能的影响,当种子乳液质量含量为12%,核-壳中所用乳化剂的质量比为2/1,种子乳液中的引发剂用量为1/3(与总用量的质量比),相比为1/2.5,得到了外观无色均匀、粘度适中的乳液。 还研究了用于改性的自制松香酯乳液用量对压敏胶主要性能的影响:随着松香酯乳液用量的增加,初粘力升高,在丙烯酸酯乳液与松香酯乳液质量配比为70/30时,改性压敏胶初粘力达到最大,然后有所下降;持粘力随着增粘树脂乳液用量的增加,其总体变化趋势是降低的,只在松香酯乳液用量较少时呈略微上更多还原

【Abstract】 In order to obtain excellent acrylate emulsion pressure-sensitive adhesive (PSA), reduce cost of PSA and raise the value of tackifying resin emulsion, the present paper discloses a kind of water dispersion pressure-sensitive adhesive composition made of acrylic(ester) monomers with core-shell polymerization and modified with rosin ester emulsion, with the result that while being a water dispersion type pressure-sensitive adhesive composition, the product-modified displays excellent properties on a par with others similar.Anion surfactant of rosin glyceride polyoxyethylene sodium sulfosuccinate monoester (RGEOS) with different polymerization degree of EO was synthesized for the first time. Surface physical chemistry properties of RGEOS were also measured and the result shows that surface tension (5) varies from 33.50 mN/m to 37.20 raN/m, critical micelle concentration (CMC) from 1.0 mmol/L to 3.6 mmol/L, interface tension (V, with turpentine) from 3.4 mN/m to 4.8 mN/m, lime soap dispersing power (LSDP) from 3.2% to 6.4%, emulsifying power (EP, with turpentine) from 202 s to 310 s, wetting power (WP) from 125 s to 265 s, and the Krafft point is below zero. The relations between surface physicochemical properties of RGEOS and polymerization degree of ethylene oxide (EO) were also studied systemically. With the increasing of polymerization degree of EO (n), foaming power (FP) is rising firstly, and then tending towards stability or dropping a little; the application properties, such as EP and LSDP, become better with increasing of n; wetting power declines.Rosin ester emulsion was made by phase translation emulsifying under atmospheric pressure. The effects of the primary factors on the properties of rosin ester emulsion, such as the quantity and way of addition of emulsifying agent, the processing conditions in the phase inversion process, were investigated: emulsifying temperature is 95 ℃; the speed of stirring and water-dropping is 650 r/min and 45 drop/min respectively. Thus, an aqueous emulsion of rosin ester, the stability of which is over 6 months at room temperature, was prepared with 5%(mass part)emulsifier.Acrylate emulsion was prepared by core-shell emulsion polymerization, and some determinant factors on product properties were discussed in detail as follows: proportion of core-shell, initiator, emulsifier, and phase ratio. The result shows that the optimum conditions are: the quantity of seed emulsion is 12%(mass part), emulsifier and initiator in seed emulsion is 2/3 and 1/3 respectively, and the phase ratio is 1/2.5.The effects of the mass quantity of rosin ester emulsion on the properties of PSA were also studied. The 180° peeling-strength of PSA is rising firstly with the increasing of mass quantity of rosin ester emulsion; it reaches the top when the m(acrylate emulsion)/m(rosin ester emulsion) is 80/20 and then drops. The effect of amount of rosin ester emulsion on probe tack of PSA is similar to that on the 180° peeling-strength. However, the value of probe tack is the biggest at m(acrylate emulsion)/m(rosin ester emulsion)=70/30. The effect of quantity of rosin ester emulsion on the holding power is obvious. When the quantity is very small, the holding power is beginning to reduce. In order to balance the properties of PSA, the optimum rate of /w(acrylate emulsion)/m(rosin-modified emulsion) is elected to be 80/20, and the properties of PSA-modified were tested: the probe tack of adhesive is 12 (steel-ball number); the holding power of PSA is 7 h; the 180° peel-strength is 6N/25mm; and the stability is over 6 months. It was found that the product-modified has excellent properties as PSA compared with others similar.The optimum tackifying resin was found that rosin ester emulsion is the best tackifier to the acrylate emulsion PSA compared with petroleum resin and terpene resin, and then the result was investigated from blending-enthalpy, HLB, molecular weight and its distributing. Finally, the tackifying-mechanism of rosin ester emulsion was explored with adsorption theory, diffusion theory and weak boundary layer theory.更多还原