高校化学工程学报Issue(3)：506-512,7.DOI:10.3969/j.issn.1003-9015.2013.03.023
自交联型可再分散苯丙乳胶粉的制备及水分散性与耐水性的协同优化研究
Preparation, Water-Redispersibility and Water Resistance of Self-Crosslinking Redispersible Styrene-Acrylate Copolymer Powder
摘要
Abstract
Self-crosslinking redispersible styrene-acrylate copolymer powder with both excellent water-dispersibility and good water-resistance was prepared via spray drying by adding self-crosslinking monomer, N-Methylolacrylamide (NMA), to the shell of the latex particles. FT-IR, TEM, SEM, Malvern particle size analysis and AFM were adopted to characterize the original emulsion, polymer powder or redispersion emulsion. The neutralization, spray drying and redispersion process of the emulsion were studied respectively and the mechanism of the emulsion having both the properties of water-redispersibility and water resistance was investigated. The self-crosslinking styrene-acrylate emulsion possesses uniform nano-scale soft core/ hard shell structure. The particle sizes of redispersible polymer powders are in the range of 2~20 μm, whereas the average latex particle size of dispersion emulsion is 182 nm, which indicates that the polymer powder possesses excellent water-redispersibility. Thicker“hairy structure”and hydrated shell are formed in the neutralization process because the hydrophobic interaction is weekend by adding NMA monomer into the shell of styrene-acrylate latex particles. During the transient drying process, fusion and crosslinking between different latex particles are impeded because of longer physical distance, and therefore better redispersibility is obtained. The water absorption of polymer film made from self-crosslinking redispersible polymer powder is lower than that of unmodified polymer powder by 40%. Hence both water-redispersibility and water resistance of styrene-acrylate copolymer powder can be improved by the self-crosslinking modification of NMA.关键词
自交联/可再分散乳胶粉/耐水性/苯丙乳液Key words
self-crosslinking/redispersible polymer powder/water resistance/styrene-acrylate emulsion分类
化学化工引用本文复制引用
朱祖威,周利庄,司徒粤,黄洪,蓝仁华,陈焕钦..自交联型可再分散苯丙乳胶粉的制备及水分散性与耐水性的协同优化研究[J].高校化学工程学报,2013,(3):506-512,7.基金项目
国家自然科学基金青年科学基金(51103045)；科技型中小企业技术创新基金初创新项目(08C26214402212)。 （51103045）
