Feasibility of using an ammonium-based lignosulfonate binder system for medium-density hardboard

Dry process medium-density hardboards were manufactured containing 12 and 16 percent lignosulfonate adhesive. Another set of medium-density hardboards was also made containing 8 percent phenol-formaldehyde adhesive to serve as a control. The lignosulfonate adhesive was applied as a spray-dried powder, and the phenolic adhesive was applied as a liquid. Hardboards were evaluated by static bending, internal bond, and change in dimension and weight with moisture changes. Lignosulfonate-bonded hardboards were lower than phenolic-bonded hardboards in static bending properties, but the lignosulfonate-bonded boards were superior in internal bond properties, especially when 16 percent resin was used. Lignosulfonate-bonded hardboards had excellent strength retention after a 24-hour water-soak, but deteriorated badly during the accelerated-aging procedure. Lignosulfonate-bonded hardboards had greater linear and weight changes than phenolic-bonded hardboards, but less thickness change.

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