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采用正交试验法探讨了大豆分离蛋白(SPI)的水解酸碱度、水解时间、水解温度及其用量对改性UF(脲醛树脂)胶粘剂性能的影响,并分析确定了合成该改性UF胶粘剂的最优方案。结果表明:当水解底物浓度为12.5%(即SPI/水质量比为1∶7)、碱用量(即固态NaOH/绝干SPI质量比)为1%、水解时间为40 min、水解温度为85℃和水解SPI对尿素的替代率(即绝干SPI水解物/尿素质量比)为15%时,改性UF胶粘剂的性能满足GB/T 14732—2006标准要求;改性UF胶粘剂大多数指标的变异系数<5%,说明该最优方案具有较好的稳定性和可靠性;FT-IR表征结果表明,SPI与甲醛-尿素共聚体系发生了化学反应。
The effects of hydrolysis pH, hydrolysis time, hydrolysis temperature and dosage of soybean protein isolate (SPI) on the properties of modified UF (urea formaldehyde resin) adhesives were discussed by orthogonal test. The effects of synthesis of the modified UF adhesives Excellent program. The results showed that when the concentration of hydrolyzed substrate was 12.5% (that is, the ratio of SPI to water was 1: 7), the amount of alkali (ie, solid NaOH / absolute dry SPI mass ratio) was 1%, the hydrolysis time was 40 min, The performance of modified UF adhesive meets the requirements of GB / T 14732-2006 standard when the replacement rate of urea (ie the absolute dry SPI hydrolyzate / urea mass ratio) at 85 ℃ and hydrolyzed SPI to urea is 15%. Most of the indexes of modified UF adhesive The coefficient of variation was less than 5%, indicating that the optimal scheme has good stability and reliability. The results of FT-IR indicated that the chemical reaction between SPI and formaldehyde-urea copolymer occurred.