硼酸-硼砂及甜菜碱处理定向刨花板的协效阻燃性能

Flame retardant performance of oriented strand board treated with boric acid-borax and polymeric betaine by cone calorimeter

以速生杨木为原料、酚醛树脂为胶黏剂、硼酸-硼砂为阻燃剂、十二烷基二甲基甜菜碱为助剂,制备杨木定向刨花板(OSB);并利用锥形量热仪研究硼酸-硼砂添加量为12%时,十二烷基二甲基甜菜碱的添加量(0.6%、1.2%和1.8%)对OSB阻燃性能的协效作用。结果表明:1)十二烷基二甲基甜菜碱添加量为1.2%时与硼酸-硼砂的协效作用最好,OSB阻燃性能最优,该OSB与空白试件相比,引燃时间延长,残余物质质量分数提高,平均释热速率、释热总量、平均质量损失率、发烟总量和平均比消光面积等均有不同程度降低,其中抑烟效果最为显著,同时具有促进成炭的作用。2)硼酸-硼砂与十二烷基二甲基甜菜碱之间存在显著的协效阻燃作用,能够有效改善OSB的阻燃性能。

The main objective of this study was to evaluate the effects of polymeric betaine （PB） on the fire retardant performance of oriented strand board（OSB） treated with 12% of boric acid-borax （1：1 ）. The panels were produced with phenol formaldehyde resin. The fire retardant performance of OSB was studied by cone calorimeter. The flammability parameters, including average heat releasing rate （av-HRR） , total heat release （THR） , average mass loss rate （MLR） , total smoke release （TSP） and average specific extinction area （av-SEA） were recorded simultaneously. The results showed that most combustion parameters of OSB decreased by the treatment. Especially for the OSB treated with PB and boric acid- borax, the av-SEA and TSP decreased dramatically ,which indicated a synergistic effect between PB and boric-acid-borax in OSB. Meanwhile, the formation of charcoal was promoted with the presence of PB.