木质水泥刨花板快速固化的热压工艺

Hot pressing technology of fast-curing for cement particle board

采用三元二次正交旋转组合设计 ,研究了热压温度、热压时间和硅酸钠的添加量等 3个因子对热压法快固水泥刨花板性能的影响。研究的固定工艺条件为 :灰木比为 2 6,水灰比 0 6,热压压力 2 8MPa,设计密度 1 2g·cm-3 。结果表明 :①热压温度对静曲强度、平面抗拉强度、吸水厚度膨胀率和密度的影响都是显著的 ,且呈二次抛物线关系 ,但对抗弯弹性模量的影响不显著。②热压时间对抗弯弹性模量、平面抗拉强度、密度和吸水厚度膨胀率的影响是显著的 ,且呈线性关系。③添加剂的添加量对静曲强度、密度和平面抗拉强度的影响是显著的 ,且呈二次抛物线关系。④热压法制快速固化水泥刨花板时 ,最佳的热压温度为1 0 0℃ ,热压时间为 1 2min ,硅酸钠的添加量为 1 0 0g·kg-1。表 5参

How hot pressing temperature,hot pressing time and the additive level of sodium silicate acted the properties of cement particle board were made by fast curing hot pressing,using ternary quadratic orthogonal rotation design when cement/wood was 2 6,water/cement 0 6,hot pressing pressure 2 8 MPa,the designed density 1 2 g·cm -3 , and the thickness 9 mm.The results showed that hot pressing temperature notably acted modulus of rupture (MOR),internal bowding(IB),thichness spread(TS),density,and the relationship was parabola,but it did not act modulus of elasti city (MOE);that hot pressing time notably acted MOE,IB,TS and density,and the relationship was linear;that the additive level of sodium silicate notably acted MOR,IB and density,and the relationshp was parabola;that the optimum hot pressing technology was that temperature was 100 ℃,time 12 min,the additive level of sodium silicate 100 g·kg -1 .