阻燃桉树胶合板的初步研究

Preliminary Study on Fire-retardant-treated Plywood

以磷酸二氢铵(MAP)溶液为阻燃剂,通过浸泡尾叶桉单板,研究了单板的载药量;以Ⅱ类胶合强度为指标,利用正交试验对常规胶合板生产工艺进行了优选。在此基础上,选取浸泡时间和最优生产工艺试制了阻燃桉树胶合板,并对其Ⅱ类胶合强度和燃烧性能进行了检测。结果表明:不同厚度尾叶桉单板的载药量随浸泡时间的延长呈现相似的增长规律;试验所得常规尾叶桉胶合板最优生产工艺为施胶量210 g.m-2、热压温度130℃、热压时间8 min,该条件下胶合板的Ⅱ类胶合强度达到了2.01 MPa;单板浸泡8h后,单板平均载药量为32.05 kg.m-3,所制得阻燃胶合板氧指数提高了13.9%,炭化长度减少了8.3 mm(26.2%),阻燃性能明显提高,而胶合强度也达到了Ⅱ类胶合板的国家标准。研究初步证明利用常规桉树胶合板生产工艺生产阻燃桉树胶合板是可行的。

To manufacture fire- retardant - treated（FRT） plywood for routine of plywood production process, MAP solution absorption patterns for Eucalyptus urophylla veneers were studied, and the routine was opti- mized by orthogonal test, in which Ⅱ class bond strength was taken as an evaluation index. Then, the im- pregnation veneers were pressed to FRT plywoods according to the optimal process, and 11 class bond strength and combustion performance of FRT plywoods were examined. The results showed that veneers with different thicknesses presented similar absorption patterns, the optimal manufacturing parameters of FRT plywood were 210 g ~ m -2 resin added, 130 ~C hot pressing temperatme and 8min hot pressing time, while its II class bond strength was 2.01 MPa and the average veneer retention was 32.05 kg ＂ m -s. After impregnating for 8 hours, the FRT plywood had presented 13.9 percent increase in OI and 8.3 mm （26.2%） decrease in charred length which were an obvious improvement of flame retardant property and met the bond strength requirement of Ⅱ class plywood. It was feasible that FRT plywood could be manufactured by routine of plywood production process.