以麦秸、木材和环保阻燃的镁系无机胶粘剂为主要原料,通过麦秸与木材均匀混合以及麦秸、木材分层复合两种方式,采用热压工艺分别制备均质结构板、以木材为表层、麦秸为芯层的3层结构板-1和以麦秸为表层、木材为芯层的3层结构板2,对比分析了3种板材的物理力学性能和阻燃性能.结果表明,3层结构板-2的静曲强度(MOR)、弹性模量(MOE)高于其它两种板材,内结合强度(IB)小于均质结构板,2h吸水厚度膨胀率(TS)大于均质结构板,增加麦秸与木材配比可以提高3层结构板-2的内结合强度;与其他两种板材相比,3层结构板-2的热释放速率(HRR)、总热释放量(THR)较小,点燃时间较长,阻燃性能较好,增加麦秸与木材配比,可以提高板材阻燃性能;较优的板坯结构为以麦秸为表层、木材为芯层的3层结构板,适当增加麦秸与木材配比可以提高3层结构板的综合性能.
With wheat straw,wood and environment friendly Mg based inorganic adhesive as main materials,inorganic particleboards with a mixture of wheat straw and wood were manufactured by hot-pressing technology.Homogenous particleboard was made by the way of mixing wheat straw and wood uniformly.Three-layered par ticleboard-1 was made with wood as surface layer and wheat straw as center ply.Three layered particleboard-2 was made with wheat straw as surface layer and wood as center ply.Physical and mechanical properties and flame retardancy of three kinds of particleboards were contrastively analyzed.Results show that modulus of rupture (MOR) and modulus of elasticity (MOE) of three-layered particleboard-2 are higher than the other two kinds of particleboards,internal bond strength (IB) of that is lower,and thickness swelling (TS) of that is higher than homogenous particleboard.In addition,increasing ratio of wheat straw and wood can improve the IB of three-layered particleboard-2.Compared with the other two kinds of particleboards,heat release rate(HRR) and total heat release(THR) of three layered particleboard-2 are lower and time to ignition of that is longer,indicating that three layered particleboard 2 has better flame retardant performance,which can be improved by increasing ratio of wheat straw and wood.The better mat structure is three-layered particleboard with wheat straw as surface layer and wood as center ply and increasing ratio of wheat straw and wood properly could improve its comprehensive performance.
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