ZnO与Mg(OH)_2在软PVC中的协同阻燃消烟作用  

Synergistic Effect of ZnO and Mg(OH)_2 on Flame-retardancy and Smoke Suppression in Flexible Poly(vinyl chloride)

作　　者：屈红强[1] 武伟红[2] 焦运红[1] 田春明[1] 徐建中[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002 [2]河北农业大学理学院,河北保定071000

出　　处：《塑料科技》2005年第6期11-15,32,共6页Plastics Science and Technology

摘　　要：用热分析的方法研究了ZnO和Mg(OH)2复合阻燃剂对软PVC的协同阻燃消烟作用,考察了经阻燃处理的软PVC从室温到800℃的热降解过程,用Kissinger方程给出了热降解反应的活化能。通过极限氧指数(LOI)、剩炭率、烟密度等级(SDR)和最大烟密度(MSD)的测定以及用电子扫描显微镜(SEM)对燃烧后所生成炭层的观察,探讨了协同体系阻燃抑烟的机理。结果表明:经阻燃处理的样品尤其是加入适量ZnO和Mg(OH)2复合阻燃剂的样品具有较高的极限氧指数(LOI)和剩炭率、较低的烟密度等级(SDR)和最大烟密度(MSD),与未处理的样品相比具有较好的阻燃和消烟性能。ZnO的加入可改变PVC的热降解过程,使起始降解温度降低,并且使反应的活化能增大,可能属于固相Lewis酸催化机理。It studied the synergistic effect of ZnO and Mg （OH） 2 on flame retardancy and smoke suppression in Flexible Poly （vinyl chloride） by means of thermal analysis, and investigated the thermal degradation process of flexible PVC treated with flame retardants ZnO and Mg（OH）2, from room temperature to 800℃. It also obtained the activation energy of thermal degradation reaction through the Kissinger equation. It studied the inflaming retarding and smoke suppressing mechanisms through the limiting oxygen index （LOI）, the char yield test, smoke density rating （SDR）, maximum smoke density （MSD）, and SEM. The results showed that flexible PVC treated with flame-retardants of ZnO and Mg（OH）2 possesses high LOI, high char yield, the maximum MSD and low SDR; the flame-retardancy and smoke suppression of the treated system are better than those of untreated system. The thermal degradation process of PVC can be changed by adding ZnO, i.e. it makes the initiative degradation temperature of PVC to be decreased and the activation energy of the sample to be increased. It may belong to the solid-phase Lewis acid-catalytic mechanism.

关 键 词：聚氯乙烯 阻燃 消烟 热分析 氧化锌 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]