硼化合物对WF-PVC热解和燃烧的影响

摘要

采用热重分析法和锥形量热仪测试方法研究硼化合物Na2B8O13·4H2O和2ZnO.3B2O3 ·3.5H2O对PVC木塑复合材料(WF- PVC)热解和燃烧过程的影响.结果表明:Na2B8 O13·4H2O对WF-PVC热解过程影响较小,2ZnO·3B2O3·3.5H2O使WF-PVC热解过程的残炭量从18.04％提高到27.57％.与未经处理的WF-PVC相比,加入硼化合物均使燃烧过程的总热释放量(THR)和总烟释放量(TSP)降低,其中,2ZnO·3B2O3·3.5H2O使THR和TSP分别降低36.3％和55.8％,阻燃和抑烟效果显著.2ZnO· 3B2O3·3.5H2O在WF-PVC中阻燃作用以凝聚相为主,同时伴随气相中的化学作用；Na2B8O13·4H2O在WF-PVC中为凝聚相作用机理.%effects of Na2O13· 4H2O and 2ZnO · 3B2O3· 3. 5H2O on pyrolysis and combustion behaviors of PVC wood-plastic composite (WF- PVC) were investigated by Thermo-gravimetry analysis CTGA) and Cone calorimeter (CONE) a-nalysis methods. It was showed that Na2B8O13· 4H2O had less effect on pyrolysis of WF-PVC ;the addition of 2ZnO · 3B2O3 · 3. 5 H2O could make residues increase from 18.04% to 27.57%, compared with WF-PVC. The total heat release (THR) and total smoke production (TSP) of PVC wood-plastic composite decreased with the introduction of 2ZnO · 3B2O3 · 3. 5H2O and Na2B8O13 · 4H2O, and they both showed fire-re-tardant and smoke-suppressant effect on the combustion processing ; for the WF- PVC composite containing 2ZnO · 3B2O3 · 3. 5H2O, the total heat release and total smoke production were decreased by 36. 3% and 55. S% respectively. 2ZnO · 3B2O3 · 3.5H2O used for WF-PVC mainly shows the characteristics of condensed phase for flame-retardant and associated with chemical reaction in gas phase. Na2B8O13 · 4H2O shows the characteristics of condensed phase for flame-retardant.