METHOD FOR BONDING LIGNOCELLULOSIC MATERIAL WITH PHENOL-FORMALDEHYDE RESIN AND CARBON DIOXIDE.

摘要

A METHOD FOR THE PRODUCTION OF LIGNOCELLULOSIC PANELS BY BONDING LIGNOCELLULOSIC COMPONENTS COATED WITH AN AQUEOUS ALKALINE PHENOLIC RESOLE RESIN SOLUTION IS DISCLOSED. THE METHOD COMPRISES CONTACTING SAID COATED COMPONENTS WITH CARBON DIOXIDE AND THEN SUBJECTING THE COMPONENTS TO HEAT AND PRESSURE TO CURE THE RESIN AND UNITE SAID COMPONENTS AND WHEREIN THE QUANTITY OF CARBON DIOXIDE WHICH CONTACTS SAID COMPONENTS IS A LEAST 1% BASED ON THE WEIGHT OF SOLIDS IN SAID RESIN. SUBJECTING LIGNOCELLULOSIC COMPONENTS COATED WITH AN AQUEOUS ALKALINE PHENOLIC RESOLE RESIN SOLUTION TO CARBON DIOXIDE INHIBITS OVERPENETRATION OF RESIN AND IMPROVES BOND STRENGTH WHEN THE COATED COMPONENTS ARE HEATED TO CURE THE RESIN BY APPLICATION OF STEAM AND PRESSURE IN THE PREPARATION OF STRUCTURAL PANELS. ALSO, CONTACT WITH CARBON DIOXIDE OF HIGH MOISTURE RESIN COATED LIGNOCELLULOSIC COMPONENTS ACCELERATES THE SPEED OF CURE AND IMPROVES BEND STRENGTH OF PANELS CURED UNDER HEAT AND PRESSURES