摘要
以苯乙烯(St)、甲基丙烯酸甲酯(MMA)为硬单体,丙烯酸丁酯(BA)为软单体,乙烯基三甲氧基硅烷(A-171)和双丙酮丙烯酰胺(DAAM)分别为核层和壳层的交联单体,合成了室温自交联改性核壳结构丙烯酸酯乳液,探究了引发体系的选择与用量、交联单体种类和添加量对乳液聚合的影响。通过衰减全反射傅里叶变换红外光谱证明交联单体成功交联,通过Zeta电位分析、透射电镜对乳液进行表征,证明成功合成了均一的核壳乳液。结果证明,以半连续种子乳液聚合法聚合,引发剂KPS和NaHSO_(3)质量比为2:1、引发剂用量为0.4%、核层自交联单体乙烯基三甲氧基硅烷(A-171)和壳层自交联单体双丙酮丙烯酰胺(DAAM+ADH)的质量分数分别为3%和2%,乳液的稳定性、耐水性和成膜性良好,转化率在90%以上,吸水率为6.87%,钙离子稳定性合格。与非核壳无交联单体乳液进行对比,热重分析表明热分解温度提高了41℃,缓解了传统水性丙烯酸酯乳液涂层耐水性差、耐溶剂性差、“热粘冷脆”的问题。
Using styrene(St)and methyl methacrylate(MMA)as hard monomer,butyl acrylate(BA)as soft monomer,vinyltrimethoxysilane(A-171)and diacetone acrylamide(DAAM)as crosslinking monomer in the core and shell layers,respectively,the self-crosslinking modified core-shell acrylate emulsions were synthesized at room temperature.The effects of initiator type and dosage,crosslinking monomer addition on emulsion polymerization were investigated.Successful cross-linking of the cross-linking monomers was proved by ATRFTIR,and the emulsions were characterized by DLS and TEM,which proved the successful synthesis of homogeneous core-shell emulsion.The results prove that the emulsions were polymerized by semi-continuous seed emulsion polymerization with the initiator m(KPS):m(NaHSO_(3))=2:1,the initiator dosage of 0.4%,and the mass fractions of self-cross-linking monomer vinyltrimethoxysilane(A-171)in the core layer and self-crosslinking monomer bis(acetone acrylamide)(DAAM+ADH)in the shell layer of 3%and 2%,respectively,and the emulsions have good stability,water resistance and film-forming property,with the conversion rate above 90%,water absorption rate above 90%,the water absorption rate is 6.87%,and the calcium ion stability is qualified.Compared with the non-crosslinked monomer emulsion without core-shell,the thermal decomposition temperature of TG is increased by 41℃,which alleviates the problems of poor water resistance,poor solvent resistance,and"hot sticking and cold brittleness"of water-based ink coating.
作者
亓子怡
程相林
唐雅馨
洪涛
高明奇
Ziyi Qi;Xianglin Cheng;Yaxin Tang;Tao Hong;Mingqi Gao(School of Chemical Engineering of Zhengzhou University,Zhengzhou 450001,China;China Tobacco Henan Industrial Co.,LTD.,Zhengzhou 450000,China)
出处
《高分子材料科学与工程》
北大核心
2025年第1期10-18,共9页
Polymer Materials Science & Engineering
关键词
核壳乳液
氧化还原引发体系
核壳双层交联
水性油墨连接料
core-shell emulsion
redox initiation system
core-shell bilayer crosslinking
water-based ink link
