竹单板载药量对薄竹胶合板燃烧性能的影响

Combustion properties of sliced bamboo plywood with chemical loading

利用复配阻燃剂采用常压浸渍法研究温度、时间、浸渍质量浓度等对竹单板载药量的影响,并测试不同载药量薄竹胶合板的燃烧和力学性能。结果表明:在温度为60℃,时间为8.0 h,浸渍质量浓度为300.0 g·L-1时为最佳浸渍条件;随着载药量的增加薄竹胶合板的热释放速率、总热释放量、烟释放速率和总烟释放量都减小,而残余物质剩余量和点燃时间在逐渐增加;氧指数测试结果表明:经过阻燃处理的薄竹胶合板的氧指数都有较明显的提高,并且随着载药量的增加而增加,当载药量A≥8%,其氧指数已达到GB/T 9846.7-2004中B1级胶合板和日本JISD1322-1977中的难燃一级品的要求;胶合强度测试表明经过阻燃处理的薄竹胶合板其胶合强度随着载药量的增加有所下降。胶合强度和含水率均能满足Ⅱ类普通胶合板的国家标准指标值。

In order to restrain the combustion of the sliced bamboo plywood and its products, which were used as decorating materials, significantly the materials above should be treated with fire retardant to increase their safety security. The effect of temperature, time, and dipping concentration on the chemical loading of sliced bamboo veneer were tested by thermostatic bath utilizing complex fire retardants at constant pressure. Com- bustible properties and mechanical properties of the fire-retardant sliced bamboo plywood were also determined using oxygen index and bonding strength tests. Results showed that the best impregnation conditions were 60 ~C for 8.0 h at an impregnation concentration of 300.0 g. L-1. Combustible properties of heat release rate, total heat release quality, and smoke release rate, decreased as chemical loading increased; however, residual material quantity and light time increased. The oxygen index of the treated plywood increased; when the chemical load- ing was 8%, the oxygen index reached the B1 fire-retardant grade as per JISD 1322-1977. Although bonding strength decreased with an increase in chemical loading, the national standard for Class Ⅱ plywood was main- tained. So, it was feasible that Sliced Bamboo plywood could be manufactured by the impregnation process un- der atmospheric pressure.