UPGRADING THE UTILIZATION OF BLACK LIQUORWASTE-BASED RS PULPIN PROCESS IN PRODUCTION HIGH PERFORMANCE WOOD ADHESIVE

THIS INVENTION DEALING WITH THE USE OF A NEW APPROACH TO UPGRADING THE UTILIZATION OF BLACK LIQUOR AS A WASTE FROM PULPING PROCESS OF RICE STRAW, IN PREPARATION OF HIGH PERFORMANCE WOOD ADHESIVE. IN THIS RESPECT THE EVALUATION WAS PERFORMED ON CHARACTERIZING THE ADHESIVES AND PARTICLE-BOARD PRODUCED, BOTH ENVIRONMENTAL AND BOARD QUALITY. THE PROMISING RESULTS FROM USING BLACK LIQUOR- UF ADHESIVE SYSTEM ARE BOND STRENGTH 9.1 N/MM2, AND MODULUS OF RUPTURE AND INTERNAL BOND STRENGTH OF BOARDS 25.4 N/MM2 AND 0.62 N/MM2, AS WELL AS REDUCED THE ENVIRONMENTAL IMPACT RESULTED FROM THE TOXICITY EMITTED FROM COMMERCIAL UREA-FORMALDEHYDE ADHESIVE USED AS BINDING AGENT IN PARTICLE BOARD (REDUCTION BY ~ 68%), AND FASTING THE RATE OF VOLATILIZATION STAGE OF THERMAL DEGRADATION OF WOOD, CONSEQUENTLY LEADS TO REDUCE THE FORMATION OF LEVOGLUCOSAN AS A FUEL FOR CONTINUE THE BURNING, AND REDUCES THE TOXICITY GASSES WHEN THE BOARD IS EXPOSED TO FIRE.