Ultrahigh-viscosity refined cotton production process

A production process and technology for refining cotton, which is applied in the directions of pulping with inorganic alkalis, finely split raw material pretreatment, textiles and papermaking, etc. Use cost, increase product viscosity, and improve the effect of ultra-high viscosity

Active Publication Date: 2015-02-25
HUBEI JINHANJIANG REFINED COTTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current process for producing high-viscosity refined cotton cannot produce products with a viscosity range of more than 2200. The main reasons are that, firstly, before the cooking process in the production process, the alkali soaking and pretreatment process of raw materials are not enough. Reasonable, so that the lye does not fully penetrate into the cotton linters, which is not conducive to the subsequent cooking treatment; second, the cooking process is simple, and a suitable cooking process is not well established according to the characteristics of the cotton linters; the third is bleaching In the process, the use of hydrogen peroxide as a bleaching agent will greatly affect the increase in product viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: ultra-high-viscosity refined cotton production process, its specific production process is as follows: a, material selection, cotton opening: select 4 tons of high-quality cotton linters without three silk impurities as raw material, and the fiber length of cotton linters is between 13 ~ 15mm, absolute dryness is 92%, maturity is over 80%, and has been treated with loosening, impurity removal and cotton opening; The final cotton linters are sprayed with a dissolving ratio of 1:2.7. After extrusion treatment at 0.18MPa, the sodium hydroxide solution is fully and evenly penetrated into the cotton linters to form alkali fibers, and the humidity of the alkali fibers is controlled at 78%; c , pretreatment: the alkali fibers after the above-mentioned fully and evenly dipped in alkali are processed through 2MPa rolling, and the lye liquor rolled out is recycled and reused. After rolling, the humidity of the alkali fibers is controlled at 45%, and then with a mass ...

Embodiment 2

[0008] Embodiment 2: ultra-high-viscosity refined cotton production process, its specific production process is as follows: a, material selection, cotton opening: select 4 tons of high-quality cotton linters without three silk impurities as raw material, and the fiber length of cotton linters is between 13 ~ 15mm, absolute dryness is 92%, maturity is over 80%, and has been treated with loosening, impurity removal and cotton opening; The final cotton linters are sprayed with a solvent ratio of 1:3.0, and after extrusion treatment at 0.20 MPa, the sodium hydroxide solution is fully and evenly penetrated into the cotton linters to form alkali fibers, and the humidity of the alkali fibers is controlled at 75%; c , pretreatment: the above-mentioned alkali fibers after fully and evenly dipping in alkali are processed through 3MPa rolling, and the lye liquid that is rolled out is recycled and reused. 4 kg of AES additives are used to perform three times of repeated spraying and rolli...

Embodiment 3

[0009]Embodiment 3: ultra-high-viscosity refined cotton production process, its specific production process is as follows: a, material selection, cotton opening: select 4 tons of high-quality cotton linters without three silk impurities as raw material, and the fiber length of cotton linters is between 13 ~ 15mm, absolute dryness is 92%, maturity is over 80%, and has been treated with loosening, impurity removal and cotton opening; The final cotton linters are sprayed with a solvent ratio of 1:2.8, and after extrusion treatment at 0.19MPa, the sodium hydroxide solution is fully and evenly penetrated into the cotton linters to form alkali fibers, and the humidity of the alkali fibers is controlled at 76%; c , pretreatment: the above-mentioned alkali fibers after fully and evenly dipping in alkali are processed through 2.8MPa rolling, and the alkali liquor rolled out is recycled and reused. After rolling, the humidity of the alkali fibers is controlled between 43%, and then the q...

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PUM

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Abstract

The invention discloses an ultrahigh-viscosity refined cotton production process. The specific production process comprises the step a of material selection and cotton opening, the step b of soaking, the step c of pretreatment, the step d of digesting, the step e of bleaching and the step f of grinding and drying. In the step d, pretreated alkali fibers are placed into an airtight spherical digester, and the temperature in the spherical digester is raised; next, the spherical digester is rotated in an idle mode, the temperature is raised again while the spherical digester is rotated, and the pressure is controlled to range from 0.20 MPa to 0.22 MPa; next, rotation of the spherical digester is stopped, a small amount of steam is released for 10 minutes, and a part of oxygen in the spherical digester is discharged to prevent oxidation and viscosity reduction; next, the temperature is raised again while the spherical digester is rotated, and the pressure is controlled to range from 0.25 MPa to 0.28 MPa; lastly, a large amount of steam is released after the temperature is kept for 30 minutes, alkali liquor is recovered, and cotton slurry is poured out when the temperature drops to 100 DEG C. The ultrahigh-viscosity refined cotton production process has the advantages that the use amount of the alkali liquor is reduced, the use cost of the alkali liquor is effectively lowered, and the requirement for improving the ultrahigh viscosity of products is met.

Description

technical field [0001] The invention relates to the technical field of refined cotton production technology, more specifically relates to the technical field of ultra-high viscosity refined cotton production technology. Background technique [0002] Refined cotton, also known as cotton pulp, is a white cotton fiber refined from cotton linters through processes such as cotton opening, cooking, rinsing, and drying. It is non-toxic, tasteless and easy to absorb water. It is the main material for the manufacture of ether cellulose, nitrocellulose and cellulose acetate. It is widely used in food, medicine, daily chemicals, plastics, electronics, papermaking, metallurgy, aerospace and many other fields. , Known as "special industrial monosodium glutamate". Under the premise of reaching a certain whiteness, the higher the viscosity of refined cotton, the better, which is more conducive to the production of high-viscosity products by cellulose manufacturers. However, the current p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21C1/06D21C1/00D21C3/02D21C9/12D21C9/18
CPCD21B1/02D21C1/00D21C1/06D21C3/02D21C9/142D21C9/185
Inventor 周家贵
Owner HUBEI JINHANJIANG REFINED COTTON
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