以丙烯腈为主要单体,以氢氧化镁为无机分散剂,采用常压聚合法,制备了膨胀倍率达到20-30倍的可膨胀小球。系统研究了二丙二醇二丙烯酸酯（DPGDA）、三缩丙二醇二丙烯酸酯（TPGDA）、新戊二醇二丙烯酸酯（NPGDA）、三羟甲基丙烷三丙烯酸酯（TMPTA）和二乙烯基苯（DVB）等5种交联单体对可膨胀小球制备的影响。通过扫描电子显微镜、热重分析、交联密度测定等手段研究了可膨胀小球的形貌、粒径、发泡剂的含量、交联密度、发泡倍率。确定DPGDA为最佳的交联剂种类,用量为1.7%。采用DPGDA作为交联剂的小球既具有较完好的球状形貌,又有较小的粒径,较高的发泡剂含量和较高的交联度,膨胀倍率可达30倍。
The thermally expandable microspheres,using acrylonitrile as the main monomer and magnesium hydroxide as the inorganic dispersant,were prepared with atmospheric suspension polymerization.This study systematically researched the effect of cross-linking agent such as dipropylene glycol diacrylate（DPGDA）,tripropylene glycol diacrylate（TPGDA）,trimethylolpropane trimethacrylate（TMPTA）, noe ponlyl glycol di acrylate（NPGDA）and divinylbenzene（DVB）on the preparation of the thermally expandable microspheres.By using scanning electron microscope,thermogravimetric analysis and determination of cross-linking density,the morphology,particle size,foaming agent content,cross-linking density and foaming ratio of thermally expandable microspheres were studied.As a result,DPGDA is found to be the most suitable cross-linking agent because the microspheres prepared with it have the perfect surface morphology,small particle size,high blowing agent content and high cross-linking degree and the dosage is 1.7%.
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