New resin system from lignin

摘要

In kraft pulp process for producing chemical wood pulps, economics require that the organic matters containing lignin in the spent liquor is burned for recovery of chemicals and heat. Kraft lignin, however, is a highly branched phenolic-like polymer possessing a variety of functional groups that provide potential reactive sites for chemical modification. Unitil now, many attempts have been made to utilize kraft lignin as a component of resins (Tomita et al., 1989; Yoshida et al., 1990; Kajiyama et al., 1994). Lee et al. (1991) prepared ozonized kraft lignin/epoxy resins and found that its wood gluability was satisfactory.