首页|尿素-乙二醛树脂改性大豆蛋白胶黏剂的制备及性能研究

尿素-乙二醛树脂改性大豆蛋白胶黏剂的制备及性能研究

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以尿素-乙二醛(UG)树脂和大豆分离蛋白(SPI)为主要原料制备大豆蛋白胶(SUG),并对其固体含量、黏度、表面张力系数、接触角及胶合性能进行测试;利用XPS、FT-IR和13 C NMR对合成的SUG的结构进行表征;采用DSC及DMA对SUG的固化性能进行测定.研究结果表明:改性后大豆蛋白胶的固体含量、黏度、表面张力系数及接触角随着SPI添加量的增加而增大,其中黏度的变化最显著;合成大豆蛋白胶中主要含有C—C、C—O—C、C、C、C等官能团;结合13 C NMR及FT-IR分析结果,可以得出UG树脂与SPI二者之间产生了交联;当SPI用量为30 g,UG树脂用量为50g时,制备的大豆蛋白基胶黏剂性能较佳且固化后储能模量较大,为4 082 MPa,在160 和180℃热压温度下制备的胶合板冷水24h湿强度分别为1.23和1.48 MPa,热水3h湿强度分别为1.05 和1.22 MPa,远大于国家标准GB/T 9846-2015 对Ⅱ类胶合板的要求,且具备一定的耐沸水性能.
Structure and Properties of Soy Protein Adhesive Modified by Urea-Glyoxal Resin
Soy protein-based adhesive(SUG)was prepared using urea-glyoxal(UG)resin and soy protein isolate(SPI)as the main raw materials,and the solid content,viscosity,surface tension coefficient,contact angle,and bonding performance of the soy protein-based adhesive were tested.Then,the structure of the synthesized soy protein-based adhesive was characterized by XPS,FT-IR and 13 C NMR.The curing performance of the adhesive was determined by DSC and DMA.The results showed that the solid content,viscosity,surface tension coefficient,and contact angle of the modified soy protein adhesive increased with the increase of SPI content,where the viscosity exhibited the most significant change.The synthesized soy protein adhesive mainly contained functional groups such as C—C,C—O—C,C,C—N and C—O.Combined with the results of 13 C NMR and FT-IR analysis,it could conclud that cross-linking occurred between UG resin and SPI.When the amount of SPI was 30 g and the amount of UG resin was 50 g,the prepared soy protein adhesive exhibited better performance,and the cured adhesive had a high storage modulus,which was 4 082 MPa.The wet strength values of the plywood prepared at 160℃and 180℃hot pressing temperatures in cold water for 24 h were 1.23 and 1.48 MPa,respectively.The hot water wet strength values after 3 h were 1.05 and 1.22 MPa,which were significantly higher than the requirements for Class Ⅱ plywood according to the national standard GB/T 9846-2015,and the prepared plywood adhesive exhibited a certain level of water resistance.

urea-glyoxal resinsoy protein adhesivecharacterizationbond strength

杨舜尧、李奇恒、张俊、夏炎、杜官本、邓书端

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西南林业大学,云南省木材胶黏剂与胶合板制品重点实验室,云南 昆明 650224

尿素-乙二醛树脂 大豆蛋白胶黏剂 表征 胶合强度

云南省基础研究重点项目高等学校学科创新引智计划项目杜官本院士工作站

202201AS070152D21027YSZJGZZ-2020052

2024

林产化学与工业
中国林业科学研究院林产化学工业研究所 中国林学会林产化学化工分会

林产化学与工业

CSTPCD北大核心
影响因子:0.696
ISSN:0253-2417
年,卷(期):2024.44(2)
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