Patent ID: 8926712
Filing Date: 2015-01-06
Classification: D01C,D01D,D01F

Abstract:
1. A method for producing a solvent spun bamboo fiber with high wet modulus, the method comprising: initiating an activation process by adding a bamboo pulp with a polymerization degree of 400-1000 into de-ionized water, adjusting a pH value to 4-6, and adding cellulase i; terminating the activation process and yielding a pulp paste by adding an alkali and adjusting the pH to a value of 11-13; squeezing the pulp paste through vacuum dehydration to yield a squeezed aqueous cellulose having a water content of 10-60% by mass; yielding a pre-dissolved pulp by adding an aqueous solution containing 50-88% by mass of N-methylmorpholine-N-oxide into the squeezed aqueous cellulose, wherein an outlet temperature of the pre-dissolved pulp is at 50-80° C.; the pre-dissolved pulp has a cellulose content of 8-12% by mass and a pH value of 8-12; and the mass ratio between the aqueous cellulose and the aqueous solution containing 50-88% by mass of N-methylmorpholine-N-oxide ranges from 1:2 to 1:12; yielding a pulp solution by placing the pre-dissolved pulp into a dissolver in which the pre-dissolved pulp is heated, vacuumized, dehydrated, dissolved, homogenized, and defoamed, wherein a vacuum degree during dissolving is 1.0 kpa-15.0 kpa; a temperature during dissolving is at 60-120° C.; and the pulp solution has a cellulose content of 11-15% by mass; spinning a bamboo fiber by delivering the pulp solution into a flow control pump by a pressure pump, spraying the pulp solution through a spinneret, and then dry-wet spinning the pulp solution in a spinning bath; wherein a spinning velocity is 35-100 m/min, a spinning air space is 5-50 mm, a spinning blowing temperature is 10-25° C., a spinning blowing flow is 100-500 L/H, a blowing relative humidity is 50-80%, a concentration of the spinning bath is 10-30% and a temperature of the spinning bath is at 5-30° C.; water washing the bamboo fiber; bleaching the bamboo fiber in a hydrogen peroxide solution having a hydrogen peroxide concentration of 0.05-1.0% and a pH value of 8-13; oiling the bamboo fiber in a circulating oil solution having an oil concentration of 0.5-5%, a pH value of 6-9, and a temperature of 50-70° C.; and drying the bamboo fiber.