以兴安落叶松刨花和脲醛树脂胶黏剂为原料,采用正交试验法研究热压温度、热压时间、施胶量、密度工艺因子对刨花板甲醛和其他挥发性有机化合物释放量的影响。结果表明: 热压温度、热压时间、施胶量和密度4个工艺因子对刨花板甲醛的释放及其他有机挥发物的释放均影响显著; 提高热压温度、延长热压时间、降低板密度能显著降低甲醛及有机挥发物的释放量; 综合考虑甲醛及其他有机挥发物释放量确定优化工艺因子为热压温度180 ℃,热压时间37.5 s·mm-1,施胶量11%,密度0.6 g·cm-3,压制出的刨花板甲醛及其他有机挥发物释放量明显下降,满足GB 18580-2001的要求。
The influence of hot-pressing factors on formaldehyde and other volatile organic compounds (VOCs) were studied in this paper. The particleboard of Larix gmelinii and UF resin were used as main raw materials. Orthogonal design was adopted to analyze the influence of hot-pressing temperature, hot-pressing time, resin content and density on the concentration of formaldehyde and other VOCs. The results showed that the emission of formaldehyde and other VOCs were significantly affected by hot-pressing temperature, time, resin and density. The emission of formaldehyde and other VOCs were obviously decreased in usage with the increasing of hot-pressing temperature, press time and the decreasing of density. Taking formaldehyde and other VOCs emission into account, the optimized condition was hot-pressing temperature of 180℃, hot-pressing time of 37.5 s·mm-1, resin content of 11%, board density of 0.6 g·cm-3. The emissions of optimized particleboard satisfied the national standard GB 18580-2001.
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