摘要
将木薯淀粉水解后与甲醛、尿素等原料共缩聚合成改性脲醛树脂,将其应用于环保型MDF制备。结果表明:改性脲醛树脂为浅黄色不透明液体,游离甲醛含量<0.10%,贮存期>25 d。FT-IR分析表明,木薯淀粉水解液参与了树脂的固化反应,主要以醚键及亚甲基键连接,体系中尚存有未水解的木薯淀粉。TG分析表明:随着木薯淀粉水解液添加量增加,树脂残碳率增大,当木薯淀粉水解液添加量为12%时,树脂残碳率为14.08%。当木薯淀粉水解液添加量为12%时,MDF的内结合强度为0.60 MPa,表面结合强度为1.12 MPa,静曲强度为27.2 MPa,弹性模量为2630 MPa,甲醛释放量仅为0.038 mg/m3,均符合国家标准要求。
Eco-friendly modified urea formaldehyde(UF)resin was prepared by co-condensation of cassava starch hydrolysate with formaldehyde,urea and other main raw materials,and its application to MDF was studied.The results showed that the appearance of modified UF resin was light yellow and opaque liquid,the content of free formaldehyde was less than 0.10%,and the storage time was more than 25 days.The results of FT-IR analysis showed that the hydrolysate of cassava starch was involved in the curing reaction of resin,which was mainly connected by ether bonds and methylene bonds,and there was still unhydrolyzed cassava starch in the system.And the results of TG analysis showed that with the increase of the amount of cassava starch hydrolysate,the carbon residual rate of resin increased.When the amount of cassava starch hydrolysate was 12%,the carbon residual rate of resin was 14.08%.When the usage of cassava starch hydrolysate was 12%,the internal bonding strength of MDF was 0.60 MPa,surface bonding strength was 1.12 MPa,the static flexural strength was 27.2 MPa,the elastic modulus was 2630 MPa,and the formaldehyde emission was only 0.038 mg/m3,which all met the requirements of Chinese standards.
作者
汤衍荣
刘金明
覃琼林
谢恩俊
冯睿
甘卫星
TANG Yan-rong;LIU Jin-ming;QIN Qiong-lin;XIE En-jun;FENG Rui;GAN Wei-xing(Guangxi Dongmen Forest Farm,Chongzuo 543000,Guangxi,P.R.China;College of Environment and Resources,Guilin 541000,Guangxi,P.R.China;Guangxi Forestry Group,Nanning 530022,Guangxi,P.R.China)
出处
《林产工业》
北大核心
2023年第5期68-72,共5页
China Forest Products Industry
基金
广西科技重大专项(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)。
关键词
脲醛树脂
木薯淀粉
中密度纤维板
水解液
甲醛释放量
Urea formaldehyde resin
Cassava starch
Medium density fiberboard
Hydrolysate
Formaldehyde emission
