摘要
本文研究了一种新型制备大尺寸(毫米级)核壳和中空微球的方法。文中采用悬浮聚合制备PS颗粒微球,再通过吸附作用进行包覆制备核壳结构微球,进而制备中空微球。该法的核心为利用聚合物单体及预聚物在溶剂中溶解和在模板聚合物表面吸附作用的平衡,从而实现聚合物在模板表面的包覆同时不会对模板产生严重的溶胀。通过采用不同尺寸模板和不同浓度单体以及包覆次数,达到调节微球尺寸和壳层厚度的目的。大尺寸微球的包覆最佳工艺条件为:水:4 mL;SDS:0.05 g;乙醇:2 mL;DMSO:9mL;温度:75℃;MMA:0.6mL;时间:90min左右。对小微球的包覆最佳工艺条件为:水:2mL;无水乙醇:1mL;DMSO:4.5mL;SDS:0.01g;MMA:0.2mL;温度:75℃;时间:90min左右。苯乙烯悬浮聚合反应的最佳工艺条件:固定单体量:苯乙烯:2.0 mL;分散剂:1.25 g;引发剂过氧化苯甲酰(BPO):0.06 g;反应温度:80℃;反应时间:90 min左右。中空微球直径从0.3～3 mm。
In this paper,a new method for preparing large size(millimeter scale)core-shell and hollow microspheres was studied.PS microspheres were prepared by suspension polymerization,then core-shell microspheres were coated by adsorption,and hollow microspheres were prepared.The core of this method was to balance the dissolution of polymer monomers and prepolymers in solvents and the adsorption on the surface of template polymer,so that the polymer could be coated on the surface of template without serious swelling of template.The size and shell thickness of microspheres could be adjusted by using different size templates,monomers with different concentrations and coating times.The optimum technological conditions for coating large-sized microspheres were:water:4 mL;SDS:0.05 g;ethanol:2 mL;DMSO:9 mL;temperature:75℃;MMA:0.6 mL;time:about 90 min.The optimum technological conditions for coating small-sized micr ospheres were:water:2 mL;absolute ethanol:1 mL;DMSO:4.5 mL;SDS:0.01 g;MMA:0.2 mL;temperature:75℃;time:about 90 min.The optimum technological conditions for suspension polymerization of styrene were as follows:fixed monomer volume:styrene:2.0 mL;dispersant:1.25 g;initiator benzoyl peroxide(BPO):0.06 g;reaction temperature:80℃;reaction time:about 90 min.The diameter of hollow microspheres ranged from 0.3 to 3 mm.
作者
张小红
Zhang Xiaohong(Shaanxi Jintai Chlor-Alkali Chemical Co.LTD.,Yulin 718100,Shaanxi,China)
出处
《橡塑技术与装备》
CAS
2019年第8期41-46,共6页
China Rubber/Plastics Technology and Equipment
关键词
中空微球
悬浮聚合
核壳结构
壳层厚度
包覆工艺
hollow microspheres
suspension polymerization
core-shell structure
shell thickness
coating process
