纯稻壳板制造工艺与性能研究

Study on Manufacturing Process of Rice Husk Particleboard and Its Properties

为充分利用稻壳资源,以纯稻壳为原料,改性酚醛树脂为胶黏剂,研究了热压温度、热压时间、单位压力以及施胶量对稻壳板性能的影响,结果表明:稻壳板的内结合强度、静曲强度与弹性模量随热压温度、热压时间、单位压力的增加而增加,24 h吸水厚度膨胀率、甲醛释放量相应减低;随着施胶量的增加,内结合强度、静曲强度与弹性模量、甲醛释放量随之增加,24 h吸水厚度膨胀率相应降低。当热压温度采用150℃、热压时间72 s/mm、单位压力1.2 MPa、施胶量为绝干稻壳质量的20%,设计密度0.85 g/cm^3时,10 mm厚稻壳板的物理力学性能指标达到P6型刨花板要求,甲醛释放量满足GB18580—2017标准要求。

To make full use of rice husk resources,using pure rice husk as raw material and modified phenolic resin as binder,the effects of hot pressing temperature,hot pressing time,unit pressure,and sizing amount on the properties of rice hull plates were studied,the results showed:The internal bonding strength,static bending strength and elastic modulus of rice hull plates increase with the increase of hot pressing temperature,hot pressing time and unit pressure,24 h water absorption thickness expansion rate and formaldehyde release are correspondingly reduced;With the increase of the sizing amount,the internal bonding strength,static bending strength,elastic modulus,and formaldehyde release amount increase,and the water absorption thickness expansion rate decreases correspondingly.Physical and mechanical properties of rice hull plates with a thickness of 10 mm when the hot pressing temperature is 150℃,the hot pressing time is 72 s/mm,the unit pressure is 1.2 MPa,the sizing amount is 20%of the dry rice husks,and the design density is 0.85 g/cm^3.The index meets the requirements of P6 particleboard,and the formaldehyde emission meets the requirements of GB18580—2017 standard.