3种处理方式对小桐子蛋白基胶黏剂的影响

Effect of 3 Treatments on Jatropha curcas Protein-Based Adhesive

在前期豆粉改性小桐子蛋白基胶黏剂的基础上,研究Na OH-尿素、Ca(OH)2/Na OH和Na HSO3处理对小桐子蛋白基胶黏剂性能的影响。结果表明:采用复合碱Ca(OH)2/Na OH处理小桐子蛋白制备的蛋白基胶黏剂性能未达预期效果;采用Na OH-尿素处理小桐子蛋白制备的蛋白基胶黏剂,仅加入交联剂CRO和p MDI制备的蛋白基胶黏剂胶合板干、湿强度满足GB/T 9846.3—2004《胶合板》中I类胶合板的性能要求;采用Na HSO3对小桐子蛋白进行处理,加入的交联剂(KF、CRO和p MDI)制备的蛋白基胶黏剂胶合板干、湿强度均能满足GB/T 9846.3—2004《胶合板》中I类胶合板的性能要求,尤其以加入交联剂CRO和p MDI制备的胶合板性能远超这一标准。3种方式处理小桐子蛋白均能与加入交联剂(KF、CRO和p MDI)的发生一定的交联反应,使小桐子蛋白基胶黏剂的干、湿强度有所提高,其中湿强度提高明显。Na HSO3对小桐子蛋白进行处理,尽可能地保留蛋白大分子结构,使得以其制备的小桐子蛋白基胶黏剂干、湿强度较另2种处理有所提高。

Based on the early study of soybean modifying Jatropha curcas protein-based adhesives, effects of processof NaOH-Urea treatment Ca（OH）2/NaOH and NaHSO3 treatment on Jatropha curcas protein-based adhesives were stud-ied in this paper. The results showed that cross-linking reaction between Jatropha curcasprotein treated by the front threeprocesses and subsequent cross-linker was obvious, and the final protein molecular size had played an important role inbonding strength and water resistance of Jatropha curcasprotein-based adhesives. Ca （OH）2/NaOH treatment for Jatrophacurcas protein was useless. NaOH-Urea treatment for Jatropha curcas protein, performance of Jatropha curcas protein-based adhesives barely met the national standards but cross-linker CRO and pMDI. NaHSO3 treatment for Jatropha curcozprotein, then adding the same amount of cross-linker such as KF, CRO and pMDI, bonding performance and water re-sistance of Jatropha curcas protein-based adhesives improved obviously. After treated by NaHSO3, Jatropha curcaz pro-tein could remain protein macromolecular structure as far as possible, and then the water resistance of Jatropha curcasprotein-based adhesives was stronger than other two treatments.