高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (6): 978.

• 论文 • 上一篇    下一篇

GHD室温自交联乳液的聚合及贮存稳定性

余樟清1, 李伯耿2, 李宝芳2, 潘祖仁2   

  1. 1. 华南理工大学化学工程研究所, 广州 510641;
    2. 浙江大学高分子科学与工程研究所, 杭州 310027
  • 收稿日期:1998-05-19 出版日期:1999-06-24 发布日期:1999-06-24
  • 通讯作者: 余樟清,男,36岁,博士,副教授.
  • 作者简介:余樟清,男,36岁,博士,副教授.

Stability of the GHD Latex Crosslinkable at Ambient Temperature

YU Zhang-Qing1, LI Bo-Geng2, LI Bao-Fang2, PAN Zu-Ren2   

  1. 1. Institute of Chemical Engineering, South China University of Technology, Guangzhou, 510641;
    2. Institute of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027
  • Received:1998-05-19 Online:1999-06-24 Published:1999-06-24

PDF (PC)

被引次数

13

摘要： 采用半连续种子乳液聚合技术合成了含甲基丙烯酸缩水甘油酯(GMA)、甲基丙烯酸羟乙酯(HEMA)和甲基丙烯酸二甲氨基乙酯(DMAEMA)的室温自交联乳液(GHD).实验结果表明,在甲基丙烯酸甲酯(MMA)-丙烯酸丁酯(BA)-GMA种子乳液存在下,聚合温度升高,聚合过程稳定性下降,但乳液的贮存稳定性提高;乳化单体滴加速度加快,种子聚合物的玻璃化温度升高,可减少聚合过程的交联凝聚作用,提高聚合过程的稳定性;而HEMA和DMAEMA用量增加对聚合过程的稳定性没有明显影响,但使乳液的贮存稳定性下降.官能团间的交联凝聚作用可能是影响室温自交联乳液聚合及贮存过程稳定性的关键因素.

关键词: 自交联乳液, 乳液聚合, 稳定性, 交联凝聚

Abstract: The GHD latex containing glycidyl methacrylate(GMA), hydroxyl methacrylate(HEMA) and dimethylaminoethyl methacrylate(DMAEMA), which is crosslinkable at ambient temperature, was synthesized. In the presence of the seed latex of methyl methacrylate(MMA)-butyl acrylate(BA)-GMA, the effects of the polymerization technology and the recipes on the process stability of the emulsion copolymerization(PSEC) of MMA-BA-HEMA-DMAEMA and the shelf life of the crosslinkable latex obtained were studied. PSEC and the shelf life are improved as more emulsifier is used. When the polymerization temperature is raised, PSEC becomes worse because the crosslinking coagulation is increased, but the shelf life of the latex becomes longer because of the smaller particles and the lower surface tension. Raising Tg of the seed polymer can depress the crosslinking coagulation during the copolymerization and improve PSEC. Increasing the content of HEMA and DMAEMA has little influence on PSEC but it reduces the shelf life of the latex. When the functional group is separated through the particle designing, the latex with acceptable shelf life is obtained. It was deduced that the crosslinking coagulation may be the key factor which determined the PSEC and the shelf life of the latex crosslinked at ambient temperature.

Key words: Self-crosslinkable latex, Emulsion Polymerization, Stability, Crosslinking coagulation

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