Solvent spun bamboo fiber with high wet modulus and producing method thereof

摘要

A solvent spun bamboo fiber with a high wet modulus and a producing method thereof are disclosed. The producing method includes: activating by adding a bamboo pulp into de-ionized water, adjusting the pH value, adding cellulase and adjusting the pH value by adding alkali; squeezing by vacuum dehydration; pre-dissolving by adding an aqueous solution containing 50-88% by mass of N-methylmorpholine-N-oxide; then dissolving by putting the above pre-dissolved mixture into a dissolver, heating, vacuumizing, dehydrating, dissolving, homogenizing and defoaming; spinning by spraying through a spinneret and forming a bamboo fiber by dry-wet spinning; water washing; bleaching; oiling; and drying. The present method is simple to operate, free of industrial pollution, low energy consuming, and highly safe. The bamboo fiber produced by the present method not only keeps the natural physical and chemical properties of bamboo fiber, but also has a high wet modulus without harmful chemical residues.

主权项

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.