A kind of high polymerization degree refined cotton production process

Abstract

The invention discloses a process for producing refined cotton with a high degree of polymerization. The production process is as follows: a, material selection; b, impurity removal; c, impregnation; d, pretreatment: triethanolamine, sodium carbonate, copper sulfate and magnesium oxide are mixed , compounded into a cooking compound with a mass concentration of 0.2-0.5% in equal proportions, put it into the steaming ball together with the impregnated cotton linters, and heated to 70 ° C, stopped heating, and carried out idling pretreatment for 40- 60min; e, cooking; f, steaming bulb to cool down; g, preparation of chlorine dioxide bleaching stable solution; h, first stage bleaching; I, alkali treatment; J, second stage bleaching; K, dechlorination; l, rolling , drying, the advantages of the invention are: the reaction effect is improved, the depolymerization during the cooking process is effectively controlled, and fibers with a high degree of polymerization can be obtained; under the protection of the auxiliary agent, the depolymerization can be effectively controlled; It also improves the whiteness of the product.

Description

technical field [0001] The present invention relates to the technical field of the production process of refined cotton, and more particularly to the technical field of the production process of high-polymerization degree refined cotton with a degree of polymerization exceeding 2800. Background technique [0002] Refined cotton is made from cotton linters, which are refined by alkaline cooking. It is the basic material for the manufacture of ether cellulose, nitrocellulose, cellulose acetate and nanocellulose. It is widely used in food, Medicine, clothing, military industry, daily chemicals, plastics, electronics, papermaking, metallurgy, aerospace and many other fields are indispensable new materials for the development of the national economy. Due to the traditional high-temperature alkaline cooking and bleaching processes such as sodium hypochlorite and chlorine dioxide, it is difficult to control the depolymerization of the pulp, which makes it very difficult to produce ...

AI Technical Summary

Problems solved by technology

[0006] The above cooking processes all focus on the use of surfactants, mainly to enhance the penetration of lye during the cooking process, and lack effective control of depolymerization

At the same time, due to the rapid release of chlorine dioxide in the bleaching process, the polymerization rate can often reach 150-300, which affects the production of high-polymerization products with a polymerization degree of more than 2800.