The effects of mass concentration, the reaction temperature and the reaction time of soy protein isolate(SPI) and sodium dodecyl sulfate(SDS) on the adhesive strength of the modified SPI adhesives has been studied through orthogonal experiments. And the adhesive mechanism of the modified SPI adhesives was discussed. The results show that the optimum formula conditions are as follows: mass concentration of SPI was 14%, that of SDS 1%, reaction temperature 35 ℃ and the reaction time 3 hours. Under the optimum conditions, the dry adhesive strength of the modified SPI adhesives was 1.82 MPa, the wet adhesive strength was 0.82 MPa, the viscosity was 5.8 Pa's, the solid content was 12.96%. After SDS was added into SPI, the composites of SDS-SPI were formed, the internal hydrophobic groups among the SPI molecule structure were turned out and the water resistance of the modified SPI adhesives was enhanced with an increase of the modification time. When the concentration of SDS was over a defined value, the disulfide bond was broken and the modification effect of SDS went bad.%采用正交试验方法研究了大豆分离蛋白(SPI)及十二烷基磺酸钠(SDS)质量浓度、反应温度、反应时间对胶粘剂粘接强度的影响；并对改性产物的机理进行了探讨.结果表明:SDS改性大豆分离蛋白胶粘剂最佳工艺条件为:14％SPI、1％SDS、反应温度35℃、反应时间3h,并测得该胶的干态粘接强度为1.82 MPa,湿态粘接强度为0.82 MPa,粘度为5.8 Pa·s,固含量为12.96％.大豆分离蛋白分子经SDS改性后形成了SDS-SPI 复合物,使包围在内部的疏水性基团转而向外,改性时间增加,其耐水性增加；SDS超过某浓度后,二硫键断裂增加,改性效果变差.
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