Effect of pH and Buffering Potential of Important Domestic Woods on the Gelation Time of Urea-Formaldehyde Resin

주요국산재의 pH 및 Buffering Potential이 요소수지접착제의 Gel시간에 미치는 영향

The pH and buffering potential for water extract of seven hardwoods and three softwoods were determined. The pH values ranged from 3.81 to 5.51 for hardwoods and 4.08 to 5.49 for softwoods. The gelation time for a urea-formaldehyde resin for each woods was determined and found to be a range of one minute thirty seven seconds to two minutes thirty nine seconds. Results shows that gelation time of a urea-formaldehyde resin was directly correlated to the pH and inversely correlated with acid buffering potential for seven hardwoods and three softwoods aqueous extracts