<正>采用改性异氰酸酯胶粘剂,在实验室压制了稻草刨花板。根据美国ASTMD1037标准,测试板的静曲强度和弹性模量、内结合强度、表面抗拉强度和模量,以及吸水厚度膨胀率和线性膨胀率。探讨了密度(0.60,0.75,0.90g/cm3)和施胶量(3%,4%,5%)对稻草刨花板性能的影响,分析了石蜡(0～3.75%)对板子力学性能和尺寸稳定性的作用。结果表明:当密度超过0.75g/cm3时,稻草刨花板抗弯性能达到ANSIA208.1标准M3级木质刨花板的要求;当施胶量为5%,密度达到0.90g/cm3时,板子内结合强度超过标准最低值。石蜡对板子的力学性能没有明显影响,但对控制板子的吸湿变形具有积极作用。

Rice strawbased particleboards(RSPB) were experimentally fabricated with modified MDI(MMDI) resin.Mechanical and dimensional properties including bending modulus(MOE) and strength(MOR),internal bond(IB) strength,inplane tensile modulus(ITM) and strength(ITS),2hour and 24hour thickness swelling(TS),and 24hour linear expansion(LE),were assessed.Potential influences of density(0.60,0.75,0.90 g/cm3),resin level(3%,4%,5%),and wax content(0～3.75%) were investigated.Results were compared with ANSI A208.1 for M3 woodbased particleboard.It’s shown that bending performance of RSPB denser 0.75 g/cm3 than satisfied the above standard,while IB strength achieved the minimum value specified in ANSI A208.1 only at 0.90 g/cm3 and with 5% MMDI.Waxsizing played an active role in dimensional stabilization,and no significant negativity was found in mechanical performance.