阻燃型NBR改性PVC软质泡沫塑料的研制

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 PVC 100份 (质量份，下同 )、 NBR 60份、邻苯二甲酸二辛酯 30份、 CP 30份、 Sb2O3 8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。

Preparation of flame- retardant PVC foam modified by nitrile rubber

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.