摘要
为了提高氯氧镁胶黏剂制备胶合板的胶合强度及耐水性能,采用磷酸和纳米二氧化硅作为改性剂,分析单一和复合添加改性剂后氯氧镁胶黏剂及其制备胶合板的各项性能。结果表明:磷酸和纳米二氧化硅的加入可以改善氯氧镁胶黏剂的物理力学性能,且两种改性剂在合适比例下复合添加的效果优于单一添加。当同时添加磷酸和纳米二氧化硅,两者添加量(以MgO质量计)分别为1%和3%时,改性氯氧镁胶黏剂的软化系数可达到0.95。傅立叶变换红外光谱仪、X射线衍射仪和扫描电子显微镜分析结果表明,两种改性剂并没有与氯氧镁胶黏剂发生化学反应,而是通过改变518相晶体的状态和纳米级颗粒填充孔隙,阻止518相晶体水解,抑制Mg(OH)2生成,使其具有更致密的结构。改性优化氯氧镁胶黏剂制备的胶合板的干、湿态胶合强度可达到1.51、1.25 MPa,满足GB/T 9846—2015《普通胶合板》≥0.70 MPa的要求。
To improve the bonding strength and water resistance of plywood made with magnesium oxychloride adhesive,phosphoric acid and nano-silicon dioxide were used as modifiers.The properties of magnesium oxychloride adhesive and plywood prepared by adding single and composite modifiers were analyzed.The results show that the modification with phosphoric acid and nano-silica can improve the physical and mechanical properties of magnesium oxychloride adhesive.The effect of the composite of the two modifiers with an optimal proportion is better than that of either one single modifier.When phosphoric acid and nano-silica are added at the same time with a ratio of(calculated by MgO mass)1%and 3%respectively,the softening coefficient of the modified magnesium oxychloride adhesive can reach 0.95.The analysis results from Fourier transform infrared spectrometer,X-ray diffractometer,and scanning electron microscope show that the modifier does not chemically react with the magnesium oxychloride adhesive,but changes the state of 518 phase crystals and the filling of pores by nano-particles,which prevents the hydrolysis of 518 phase crystals,inhibits the generation of Mg(OH)2,and forms a denser structure.The dry and wet bonding strengths of plywood prepared with optimal modified magnesium oxychloride adhesive can reach 1.51 and 1.25 MPa,which meets the requirement of≥0.70 MPa of GB/T 9846-2015 Plywood for general use.
作者
王颖
王慧珊
吕少一
张龙飞
彭立民
WANG Ying;WANG Huishan;LYU Shaoyi;ZHANG Longfei;PENG Limin(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China)
出处
《木材科学与技术》
北大核心
2024年第4期44-50,共7页
Chinese Journal of Wood Science and Technology
基金
“十四五”国家重点研发计划课题“木质制品表面绿色装饰材料制备及应用”(2022YFD2200703)。
关键词
氯氧镁胶黏剂
磷酸
纳米二氧化硅
518相
胶合强度
耐水性能
magnesium oxychloride adhesive(MOA)
phosphoric acid
nano silica
518 phases
bond strength
water resistance
作者简介
王颖(1999-),女,博士研究生。Email:wying@caf.ac.cn;通讯作者:彭立民,男,研究员。Email:penglm@caf.ac.cn。
