Effect of press procedure on the performance of soy-based
adhesive with hybrid cross-linker EPRþMF Soy adhesives with 6.4%EPR+ 6.4%MF were used for the preparation of plywood in the laboratory. Effects of press temperature and press time on the performance of plywood with soy-based
adhesive are shown inTable 3. The results show that even with press temperature 1201C, type II plywood could be obtained. With press temperature 1401C, the water resistance of plywood was good enough to meet the requirement of type I plywood and did not show much difference with those when higher temperatures 1601C and 1801C were used.
2–6 min at 1601C was too short to cure soy adhesive with EPRþMF, which indicated by the poor water resistance shown in
Table 3. With 4–6 min, the dry shear strength of plywood was good. This meant that 4–6 min was enough for curing of soy adhesive but not enough for its cross-linking. Hot-press time as long as 8 min may be a problem for the commercialization of the cross-linked soy adhesive