大豆分离蛋白水解物改性三聚氰胺脲醛树脂的合成及表征

摘要

以水解大豆分离蛋白(SPI)、尿素、三聚氰胺和甲醛为原料通过溶液聚合反应合成了一种含有三嗪环结构的水解大豆蛋白基改性三聚氰胺脲醛树脂(SPI/MUF)胶黏剂.利用红外光谱(FT-IR)、热重分析(TGA)、差示扫描量热分析(DSC)及胶体流变性分析等手段对产物进行了表征.结果表明:MUF中成功接入了大豆分离蛋白；TG分析表明该树脂具较高初始分解温度,至800℃时SPI/MUF残余质量28.84％,MUF的残余质量仍有22.13％,合成树脂热稳定性高于MUF胶；DSC表明SPI改性MUF胶固化温度降低,热稳定性提高；流变性分析表明加入氯化铵后,SPI/MUF的初始储能模量(G′)提高,损耗模量(G″)降低,在70℃时树脂仍有较高的黏性.%A kind of triazine ring structure hydrolyzed soy protein modified urea-formaldehyde resin adhesive (SPI/MUF) was synthesized from hydrolyzed soy protein,urea,melamine and formaldehyde by solution polymerization reaction.The products were characterized with Fourier transition infrared spectroscopy (FT-IR),thermo gravimetric analysis (TGA),differential scanning calorimetry (DSC) and colloid rheology.FT-IR results showed that biodegradable beans group was accessed with the SPI/MUF successfully.Compared with MUF,the initial decomposition temperature of SPI/MUF was higher,and had a higher thermal stability since residual quality is still 28.84 ％ of SPI/MUF and 22.13 ％ of MUF at 800 ℃.DSC showed that thermal stability of SPI modified MUF adhesive increased,and its curing temperature decreased.The resin storage modulus (G′)obviously increased when ammonium chloride was added,but the loss modulus (G″) obviously decreased.It still had a higher viscosity at 70 ℃.