阻燃型NBR改性PVC软质泡沫塑料的研制

张军　 梁亚平　

摘　要：在以聚氯乙烯(PVC)为主体材料、加入丁腈橡胶(NBR)共混改性、用化学交联模压一步法制备改性PVC泡沫塑料的基础上，选用阻燃型增塑剂氯化石蜡(CP)、阻燃剂Sb2O3进行阻燃型NBR改性PVC软质泡沫塑料的制备研究。结果表明，当用Pvc100份(质量份，下同)、NBR60份、邻苯二甲酸二辛酯30份、CP30份、Sb2038份、偶氮二甲酰胺4.0份、N,N′-二亚硝基五次甲基四胺4.0份、过氧化二异丙苯1.0份及适量稳定剂时，可使NBR改性PVC软质泡沫塑料的氧指数达到27.0％，综合力学性能较好。电镜分析表明，阻燃型NBR改性PVC软质泡沫塑料的泡孔分布均匀性不如非阻燃型同类产品的好。
关键词：聚氯乙烯；丁腈橡胶；泡沫塑料；化学交联；模压法；力学性能；阻燃性能
分类号：TQ 325.3　文献标识码：B
文章编号：1000-1255(2001)01-0036-05

Preparation of flame- retardant PVC foam modified by nitrile rubber

Zhang Jun（College of Materials Science and Engineering, Nanjing University of Chemical Technology,Nanjing, Jiangsu 210009）　
Liang Yaping（College of Materials Science and Engineering, Nanjing University of Chemical Technology,Nanjing, Jiangsu 210009）　

Abstract：Using chemical crosslinking technologyand one-step compression molding process, thefoaming technique of flame-retardant polyvinylchloride(PVC) foamed plastics modified by nitrilerubber(NBR) was studied. The effects of chlorinatedparaffin(CP) , dioctyl phthalate(DOP), Sb203, mod-ified rubber types, blowing agents, fillers andcrosslinking agent on modified flame - retardant PVCfoam were discussed. The optimum recipe (phr) wasas follow: PVC 100, NBR 60, DOP 30, CP 30, Sb2038, blowing agent AC 4. 0, blowing agent H 4. 0,dicamyl peroxide 1.0. The oxygen index of flame -retardant PVC foam was 27.0% and the mechanicalproperties were good. The experiment of electronmicroscope showed that the cellular structure offlame- retardant PVC foamed plastics was not sogood as that of flammable PVC foamed plastics.
Keywords：polyvinyl chloride; nitrile rubber;foamed plastics;chemical crosslinking;compressionmolding;mechanical property;flame retardance