Resin Binders from Kraft Lignin

A waterproof resin based on kraft lignin and a one-stage phenol formaldehyde (PF) resin was prepared and some of its properties evaluated. The preparation involved methylolation of the kraft lignin black liquor concentrate at a pH of about 12, followed by acidification to pH 5 thereby producing a dispersion of the precipitated lignin. The lignin dispersion was then blended with an acid curing PF resin. Some of the factors affecting its curing properties included methylolation of the kraft lignin, the amount of PF resin incorporated and the pH. This resin shows considerable promise as a waterproof adhesive for plywood and waferboard. Results indicate that up to 70 percent of the petroleum-based PF resins can be replaced with kraft lignin on a weight-by-weight basis.

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