摘要
稻草灰分含量较高,并且表皮被二氧化硅所覆盖,使用传统的脲醛树脂(UF)生产的100%的稻草板强度低、尺寸稳定性差、耗胶量大。采用液态热水法预处理稻草,预处理温度分别为160和170℃,时间分别为2、4、6 min。预处理后的稻草与木质刨花按1∶1的比例进行混合,以脲醛树脂为胶粘剂制造密度为0.75 g/cm3的稻草-木材复合材料,热压温度与压力分别为150℃和3.5 MPa,施胶量为12%。试验结果表明,由经过160℃、停留时间为6 min和170℃、停留时间分别为4 min与6 min预处理的稻草制备的板材达到了国标GB/T 4897—2003对于强度性能的要求。
Rice straw,whose outer surface is covered by silica,has relative higher ash content.100%pure rice straw panel board manufactured with conventional low cost urea formaldehyde( UF) was featured by low strength,poor dimensional stability and high resin requirement.This work employed liquid hot water to pretreat rice straw,with pretreatment temperature of 160℃ and 170℃ and residence time of 2 min,4 min and 6 min.The pretreated rice straw was mixed with wood particle at the ratio of 1∶ 1by using UF to produce rice straw-wood composite with 0.75 g/cm3density.The hot press temperature and pressure were 150℃ and 3.5 MPa,respectively.The resin application level was 12%.The experimental results indicated that the panel board made with rice straw pretreated under 160℃ for 6 min and 170℃ for 4 min and 6 min met the requirement of China national standard for particleboard GB/T4897—2003.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2013年第S1期156-158,142,共4页
Transactions of the Chinese Society for Agricultural Machinery
基金
"十二五"国家科技支撑计划资助项目(2012BAD32B04)
国家级大学生创新创业训练计划资助项目(201210069010)
