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Cellulose pulp and production method thereof

A technology of cellulose pulp and production method, applied in the field of cellulose pulp, can solve the problems of low production efficiency, slow reaction speed and high viscosity

Inactive Publication Date: 2010-04-07
NANTONG CELLULOSE FIBERS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cotton pulp currently on the market has at least one of the following characteristics: high crystallinity, low cellulose purity, high density, high degree of polymerization / intrinsic viscosity, and at least one of the following problems occurs in the production of cellulose acetate: (1) slow reaction speed , low production efficiency; (2) product whiteness is poor; (3) the pulp is difficult to grind and the reaction is incomplete; (4) the viscosity of the manufactured cellulose diacetate in the acetone solution is high and the fluidity is poor, which is not conducive to spinning Silk

Method used

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  • Cellulose pulp and production method thereof
  • Cellulose pulp and production method thereof
  • Cellulose pulp and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Select ten kinds of cotton linters of different origins or different maturities, and process each of them into cotton pulp according to the following process and test the crystallinity of the pulp by the above method:

[0078] (1) Material selection (50 kg), open cotton, and dry impurity removal: When selecting materials, select high-quality cotton linters with no impurities and no foreign fibers. Use a cotton opener to tear the cotton linters, and use a trash remover to select and remove impurities;

[0079] (2) Processing cotton linters into cellulose pulp: including material preparation, pre-soaking, cooking, washing, beating, sand removal, concentration, oxidation, bleaching, and sand removal.

[0080] Put the raw materials into a digester, add NaOH with 7% of the absolute dry lint content, use sodium dodecylbenzene sulfonate with 1.2% of the absolute dry lint content, and add hydrogen peroxide with 1.2% absolute dry lint content. Add 0.2% of the absolute dry lint amount ...

Embodiment 2

[0088] (1) Material selection, cotton opening, dry impurity removal: When selecting materials, select high-quality Class II cotton linters with no impurities and no foreign fibers, and their maturity is 69%. Use a cotton opener to tear the cotton linters, and use a trash remover to select and remove impurities;

[0089] (2) Preparation, prepreg, cooking, washing, beating, desanding, concentration, oxidation, bleaching, desanding, steps and processes refer to Example 1.

[0090] (3) Sheet the cellulose slurry.

[0091] After the above-mentioned cellulose pulp is prepared and pulped, the cellulose pulp is cut into a sheet shape.

[0092] The slurry concentration is controlled at 1.2-1.3%. Control the pressure of the roller of the net part is 2.5kgf / cm 2 , One squeezing pressure is 3.5kgf / cm 2 、The second pressing pressure is 5.5kgf / cm 2 , So as to ensure the stability of the moisture and density of the pulp before drying. The temperature of the first group of drying cylinders is contr...

example 2

[0094] Table 3 Example 2 Main indexes of preparing cotton pulp

[0095] density:

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Abstract

The invention discloses cellulose pulp and a production method thereof, mainly used for producing cellulose diacetate and cellulose triacetate. In the invention, category II cotton linter, or category III cotton linter with ripeness being 60-70%, or a mixture of category II cotton linter and category III cotton linter are used as the raw material, I type cellulose crystallity of cellulose pulp is within the range of 60-74%, the acetifying reaction has good performance and low cost, and the invention is suitable for commercialized production of cellulose diacetate.

Description

Technical field: [0001] The invention relates to cellulose pulp, in particular to a cotton pulp prepared by using cotton linters as raw materials and a manufacturing method thereof, and is mainly used for manufacturing cellulose acetate. Background technique: [0002] Cellulose pulp (hereinafter referred to as pulp) is an industrial product prepared from natural raw materials, for example, wood pulp or cotton pulp prepared from wood or cotton linters. Its main uses include the manufacture of cellulose diacetate and cellulose triacetate. And viscose fiber. The cellulose diacetate manufacturing process, for example, the main steps described in patent 200910030549.4: (1) pulp crushing: the rolled pulp product is crushed into a fluffy appearance through a grinder; (2) activation: acetic acid or acetic acid aqueous solution is sprayed On the crushed pulp (cellulose), or immerse the pulp in acetic acid or acetic acid aqueous solution for activation treatment, there may be a small amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/06D21C5/00
CPCD21H11/02D21H11/12
Inventor 马晓龙彭为骏张杰吴保杰谢文琦季守信
Owner NANTONG CELLULOSE FIBERS CO LTD
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