A kind of ultra-fine ultra-short viscose staple fiber used for environmental protection filter material and preparation method thereof

Abstract

The invention discloses a superfine ultrashort viscose staple fiber for an environment-friendly filtering material and a preparation method of the superfine ultrashort viscose staple fiber. The viscose staple fiber is 2-6mm in length and 0.2-0.65dtex in fineness. The preparation method comprises the steps of firstly, preparing viscose rayon by adopting cellulose pulp as a raw material and spinning, wherein the Ni value of the viscose rayon for spinning is more than or equal to 160ml, the content of alpha cellulose is 5-8%, the alkali content is 4-6%, the viscosity is 25-60s, and the viscosity of cuprammouium at an ageing outlet is more than or equal to 40mpas; secondly, spinning and forming the viscose rayon with a spinneret plate with the pore diameter of a spinning nozzle being 0.03-0.05mm; thirdly, carrying out spinning nozzle drafting, drafting among discs and plastifying drafting during spinning and forming to obtain the superfine viscose, wherein the drafting among discs accounts for 20-40%, the plastifying bath drafting accounts for 5-15%; and fourthly, carrying out desulfurization, bleaching, oiling, cutting off and other postprocessing steps to obtain the superfine ultrashort viscose staple fiber for the environment-friendly filtering material.

Description

technical field [0001] The invention relates to a fine denier viscose staple fiber, in particular to an ultra-fine and ultra-short viscose staple fiber used for environmental protection filter materials and a preparation technology thereof. Background technique [0002] The main application field of ultra-fine and ultra-short fibers is fine filter materials, which are ultra-fine and high-density non-woven fabrics made of ultra-fine fiber materials. The sales of non-woven fabrics for filtration are increasing year by year, and the analysis believes that the application of filter materials in China is facing a very good prospect. First of all, since the reform and opening up, my country's automobile production has increased year by year, and filter materials are not only used in the interior of automobiles, but also in the entire automobile production process. With the development of my country's automobile industry, filter materials will occupy a large share in the applicati...

AI Technical Summary

Problems solved by technology

The fine-denier viscose fiber in the prior art is limited by its fineness, adsorption and filtration performance, and is not suitable for use as a fine filter material, especially it cannot meet the environmental protection performance requirements of the filter material in the automotive industry and the environmental protection field.