Method for producing ultrahigh-viscosity refined cotton

Abstract

The invention relates to a method for producing ultrahigh-viscosity refined cotton, and belongs to the technical field of refined cotton manufacture. The invention aims to provide the ultrahigh-viscosity refined cotton, the finished whiteness of which is more than 75 percent, the viscosity of which is more than 1,500mPa.s and the impurity content of which is low. The method comprises the following processes of: (1) selecting materials, opening cotton and digesting, wherein the NaOH content of the digesting solution is 20 to 45g / l, and sodium alkyl benzene sulfonate serving as an emulsifying agent is 0.05 to 0.5 weight percent; (2) pre-bleaching, wherein the concentration of sodium chlorite is 0.05 to 1 weight percent; (3) acidifying for 30 to 60 minutes when the pH is 2 to 4; (4) bleaching with hydrogen peroxide, namely washing the acidified cotton pulp, regulating the pH to be between 8 and 11, adding H2O2, and bleaching for 1 to 2 hours; and (5) drying to obtain a finished product. The ultrahigh-viscosity refined cotton product with viscosity of more than 1,500mPa.s and whiteness of more than 75 percent is produced by the method; and the method can meet the requirements of cellulose ether and cellulose ester manufacturers for producing ultrahigh-viscosity products.

Description

technical field [0001] The invention relates to a production process of ultra-high-viscosity refined cotton, more specifically relates to a production process of ultra-high-viscosity refined cotton with a viscosity greater than 1500mPa·s, and belongs to the technical field of refined cotton production. Background technique [0002] When cellulose ether and cellulose ester manufacturers produce high-viscosity products, they always require that the raw material—refined cotton—reach a certain degree of whiteness, and the higher the viscosity, the better, so as to meet their requirements for producing high-viscosity products. Traditional refined cotton production generally adopts the following processes: 1) Cotton linters are opened; 2) High-pressure cooking: add cotton linters to the cooking pot, add lye to heat up and cook; 3) Washing: Cook the cotton linters washing; 4) pretreatment before bleaching; 5) bleaching; 6) rolling and drying to obtain the finished product. Such as...

AI Technical Summary

Problems solved by technology

Its shortcomings are: the maturity of the selected cotton linters is high, requiring more than 80%, and it is difficult for ordinary cotton linters to reach such a high maturity; the cooking is completed by two-stage cooking, and the process is not easy to control; when bleaching, the unit Product consumed H 2 o 2 The amount is too large and within the bleaching time H 2 o 2 It cannot be effectively utilized, and the production cost is relatively high; in addition, the viscosity of the refined cotton produced by this invention is only greater than 800mPa·s, which cannot meet the requirements of the raw material—refined cotton—for the production of high-viscosity cellulose ether and cellulose ester. Viscosity requirements

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