液化木薯淀粉对改性酚醛树脂的性能影响及结构表征  

Effects of Liquefied Cassava Starch on the Property of Modified Phenol Formaldehyde Resin and Its Structure Characterization

作　　者：方建林 莫海林 刘金明 侯志兵 甘卫星 FANG Jian-lin;MO Hai-lin;LIU Jin-ming;HOU Zhi-bing;GAN Wei-xing(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,Guangxi,P.R.China;College of Environment and Resources,Guangxi Normal University,Guilin 541006,Guangxi,P.R.China;Tiansheng New Material Development Co.,Ltd of Ziyuan County,Guilin 541407,Guangxi,P.R.China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004 [2]广西师范大学环境与资源学院,广西桂林541006 [3]资源县天盛新型材料开发有限公司,广西桂林541407

出　　处：《林产工业》2022年第6期19-24,共6页China Forest Products Industry

基　　金：广西科技重大专项(桂科AA18118044,桂科AA17204067);国家科技支撑计划项目(2015BAD14B03);国家自然科学基金项目(31360158);广西林业科技项目(桂林科字[2015]第21号)。

摘　　要：以苯酚为液化剂,在酸性条件下液化木薯淀粉,将所得液化产物用于制备淀粉基改性酚醛(APF)树脂胶黏剂。采用单因素条件探讨液化过程中木薯淀粉添加量对改性树脂性能的影响,并通过FT-IR和SEM表征改性树脂结构。结果表明:随着木薯淀粉添加量的增大,改性树脂胶合强度逐渐下降,当液固比从2.4∶1降至1.0∶1时,制备的胶合板胶合强度由1.85 MPa降至1.14 MPa,降幅达到38.4%,但仍高于国家标准要求的0.7 MPa。同时,随着木薯淀粉添加量的增大,胶合板甲醛释放量逐渐减小,由0.279 mg/L降至0.095 mg/L,远低于国家标准E0级(0.5 mg/L)要求。FT-IR分析表明,在1014 cm^(-1)和1147 cm^(-1)处分别出现芳香醚C—O和芳香醚C—O—C的伸缩振动峰。SEM结果显示,木薯淀粉经液化后细胞壁形态遭到严重破坏,结晶度降低,但仍可观察到APF树脂的表面存在颗粒,说明APF树脂产生了更多的活性芳核衍生物,总体活性增强,易于发生化学交联反应。The cassava starch was liquefied by phenol under acidic condition,which reacted with formaldehyde successfully to prepare the amylum-based phenol formaldehyde(APF)resin wood adhesive.The single factor named cassava starch content was investigated on the properties of the modified resin,and FT-IR and SEM were used to characterize its structure.The results showed that the bonding strength of APF decreased gradually with the increasing of cassava starch content.The bonding strength still met the requirement of the national standard of 0.7 MPa,even the bonding strength of plywood decreased from 1.85 MPa to 1.14 MPa by 38.4%when the liquid-solid ratio decreased from 2.4 to 1.0.Meanwhile,the formaldehyde emission of plywood also decreased with the increasing of cassava starch content,which decreased from 0.279 mg/L to 0.095 mg/L and much lower than the requirement of E0(0.5 mg/L).The stretching vibration of aromatic ether C-O peak appeared at 1014 cm^(-1),and the stretching vibration of aromatic ether C-O-C peak appeared at 1147 cm^(-1) based on FT-IR.The SEM results displayed that the cell wall structure was destroyed and more active aromatic nuclear derivatives were produced after the process of the liquefaction of cassava starch with phenol.And the overall activity of cassava starch was enhanced and easy to undergo chemical crosslinking reaction.

关 键 词：苯酚 液化木薯淀粉 改性 APF树脂 性能与结构 

分 类 号：TS653[轻工技术与工程]