BigPatents India

A method of manufacturing Natural Fiber and Thermoset composite fireproof sheet / board comprising the steps of : - a) reacting phenol, monochloro phenol with formaldehyde in the molar ratio 0.1 to 5.0 :01 to 4.0: 0.1 to 7.0 in presence of acid catalyst or phenol, monochloro phenol and formaldehyde in the molar ratio 0.1 to 5.0: 0.01 to 4.0: 0.1 : 7.0 in presence of Alkaline catalyst; to obtain modified mouldable phenolic resin; b) dissolving the said resign of step (a) in methenol with crosslinking agent; c) forming a slurry by mixing filler and additives in the resign solution of step (b); d) impregnating jute cloth of any form in the said slurry of step (c) ; e) drying the impregnated jute cloth oven at temperature of 100°c to 400°c; f) cutting the dried jute of any form impregnated in slurry in the required size; g) layering the jute of any form impregnated with slurry in multilayered fashion in the required thickness and pressing in the hydraulic press at a pressure 1 to 3 tons per square inches for a period of 5 to 30 minutes, at a temperature of 100°c to 200°c ; h) trimming the multilayered pressed material in required size to form the Natural Fiber Thermoset Composite sheet / boards.