Method for preparing viscose fiber

Abstract

The invention discloses a preparation method of viscose fibers, which is characterized in that the cellulose pulp is used in the viscous glue preparation procedure; the cellulose pulp together with an additional modifier are processed to cellulose xanthate with high esterification degree and ripeness degree; the spinning procedure is performed under such conditions as low coagulation bath temperature, low acidity and high sodium sulfate concentration, without using zinc sulfate which results in serious environmental pollution; the thickness of fiber skin is increased by drafting; and the produced viscose fiber has high strength and high wet modulus. The invention solves the problem of zinc pollution in the prior art, produces viscose fibers with high strength, high wet modulus, and good tension, and overcomes the disadvantages that the fabric is easy to deform, instable in size and nonresistant against base when the viscose fiber is in wet state. Compared with the prior viscose staple fibers, the fabric made of the inventive fibers is superior in high strength and good resistance against deformation and alkali.

Description

technical field [0001] The invention relates to a cellulose fiber technology, in particular to a preparation method of viscose fiber. Background technique [0002] The use of toxic and resource-poor zinc sulphate to produce viscose fiber is a major disadvantage in current manufacturing. The zinc sulfate contained in the spinning wastewater in viscose fiber production has brought great pollution to the environment, seriously endangering people's health, and various methods of zinc wastewater treatment such as precipitation, resin treatment or dilution discharge The treatment costs are relatively high, and the discharge water quality indicators are also unstable. In order to solve this phenomenon, low-zinc spinning is currently used in factories, but when the zinc in the coagulation bath drops to 6g / l, the hook strength of the prepared fibers will be affected. At present, the zinc-free coagulation bath method is used to produce viscose fiber, although it avoids the environme...

AI Technical Summary

Problems solved by technology

The zinc sulfate contained in the spinning wastewater in viscose fiber production has brought great pollution to the environment, seriously endangering people's health, and various methods of zinc wastewater treatment such as precipitation, resin treatment or dilution discharge method, etc., the treatment costs are high, and the discharge water quality indicators are also unstable

In order to solve this phenomenon, low-zinc spinning is currently used in factories, but when the zinc in the coagulation bath drops to 6g / l, the hook strength of the prepared fibers will be affected

And adopt zinc-free coagulation bath method to produce viscose fiber at present, although it has avoided the environmental pollution that zinc salt brings, the physical and mechanical property index of the viscose fiber that makes is relatively poor

And the obtained common viscose fiber swells violently in the wet state, so that the wet strength and modulus are very low, the fabric is easily deformed, the dimensional stability is poor, it is not alkali-resistant, and it cannot withstand the mercerizing treatment to improve the appearance of the fabric. When dyeing, only loose dyeing can be used, which makes it difficult to carry out the dyeing process continuously. However, although the wet strength and wet modulus of the polynosic fiber produced are high, the fiber hook strength is low, the brittleness is large, and it is easy to dye. Form a fibrillated structure, and the process is more complicated, so its product application is limited to a certain extent