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Preparation method of ultralow-viscosity sodium carboxymethyl cellulose

A technology of sodium carboxymethyl cellulose and viscosity, which is applied in fiber treatment, textiles and papermaking, etc., can solve the problem of high viscosity of sodium carboxymethyl cellulose, and achieve good water solubility, stable viscosity and good film-forming properties

Inactive Publication Date: 2012-03-07
HANGZHOU HONGBO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium carboxymethyl cellulose produced by this method has a high viscosity and is not suitable for high-count yarn sizing

Method used

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  • Preparation method of ultralow-viscosity sodium carboxymethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1kg of cotton fiber that has been loosened, 1.45kg of 48% sodium hydroxide and 1.5kg of 90% ethanol to the kneader at the same time, then add 0.06kg of solid sodium perborate powder and 0.18kg of 30% hydrogen peroxide ethanol solution (ethanol accounts for 70%), add in 3 times, under stirring, heat up to 60°C, reduce viscosity for 60 minutes. Spray 0.9kg of ethanol solution of chloroacetic acid (the concentration of chloroacetic acid is 50%) into the kneader evenly, carry out carboxymethylation reaction, react at 76°C for 50 minutes, then cool down to 60°C, and then continue to add 50% 0.10kg of hydrogen peroxide ethanol solution, reduce viscosity for 60 minutes, add 0.7% (based on cotton fiber quality) sodium sulfite, react for 10 minutes, cool down and discharge, neutralize, wash, centrifuge, dry, and pulverize to obtain pure low-viscosity carboxymethyl Sodium cellulose. Substitution degree 0.84, type B (Brookfield) 4% viscosity 8.8cps, purity 97.7%, cmc solution...

Embodiment 2

[0026] Put 1kg of cotton fiber that has been opened, 1.35kg of 49% sodium hydroxide aqueous solution and 1.5kg of 90% ethanol into the kneader at the same time, and then add 0.20kg of 27% hydrogen peroxide ethanol solution (73% ethanol), divide into 3 Add it once, stir and heat up to 50°C, and reduce the viscosity for 60 minutes. Spray 0.75kg of ethanol solution of chloroacetic acid (the concentration of chloroacetic acid is 80%) evenly into the kneader for carboxymethylation reaction, react at 77°C for 40 minutes, then cool down to 50°C, and then continue to add 70% Hydrogen peroxide ethanol solution 0.08kg, reduce viscosity for 50 minutes, add 0.6% sodium sulfite powder (based on cotton fiber quality), react for 10 minutes, then neutralize, wash, centrifuge, dry, and pulverize to obtain pure low-viscosity carboxymethyl The degree of substitution of sodium cellulose is 0.75. Type B (Brookfield Viscosity) has a 4% viscosity of 12cps, a purity of 98.1%, and a clear cmc solutio...

Embodiment 3

[0028] Put 1kg of cotton fiber that has been loosened, 1.25kg of 47% sodium hydroxide aqueous solution and 1.5kg of 90% ethanol into the kneader at the same time, and then add 0.16kg of 50% hydrogen peroxide ethanol solution (50% of ethanol), divide into 3 Add it once, stir and heat up to 60°C, and reduce the viscosity for 40 minutes. Spray 0.65kg of ethanol solution of chloroacetic acid (60% concentration of chloroacetic acid) evenly into the kneader for carboxymethylation reaction, react at 78°C for 60 minutes, then cool down to 60°C, and then continue to add 68% Hydrogen peroxide ethanol solution 0.08kg, reduce viscosity for 60 minutes, add 0.6% sodium sulfite powder (based on cotton fiber quality), react for 10 minutes, then neutralize, wash, centrifuge, dry, and pulverize to obtain pure low-viscosity carboxymethyl The degree of substitution of sodium cellulose is 0.68. Type B (Brookfield Viscosity) has a 4% viscosity of 17cps, a purity of 97.6%, and a clear cmc solution....

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Abstract

The invention aims at providing a preparation method of ultralow-viscosity sodium carboxymethyl cellulose which is industrially produced by adopting a kneading machine and is suitable for high-count yarn starching. The preparation method comprises the following steps of: adding ethanol and high-concentration caustic soda liquid to cotton fibre, adding a viscosity breaking agent in several times, carrying out viscosity breaking on the cotton fibre at high temperature and alkalizing the cotton fibre at the same time; adding an etherifying agent for etherification, then adding the viscosity breaking agent for viscosity breaking again after etherifying reaction, and adding sodium sulfite to reduce the residual viscosity breaking agent in the ethanol as a reaction medium and in reactants off; and neutralizing and washing, centrifuging, drying and crushing to obtain the ultralow-viscosity sodium carboxymethyl cellulose (CMC) for textile starching. The ultralow-viscosity sodium carboxymethylcellulose prepared by the preparation method disclosed by the invention has moderate substitution degree and low viscosity, wherein a B-type viscometer (Brookfield) 4% is 8-17CPS and has the purity more than 97%. The CMC solution is clear, has stable viscosity and is particularly suitable for a starching process of yarns with high and ultrahigh cotton yarn count.

Description

technical field [0001] The invention relates to a preparation method of sodium carboxymethyl cellulose, in particular to a preparation method of ultra-low viscosity sodium carboxymethyl cellulose suitable for high-count yarn sizing. Background technique [0002] Sodium carboxymethyl cellulose (abbreviated as cmc or Na-cmc) is usually obtained by etherification reaction of natural cellulose with chloroacetic acid under alkaline conditions. According to different raw material specifications and different reaction conditions, products with different degrees of substitution, different molecular weights and different substitution uniformity can be obtained. [0003] At present, the viscosity of CMC used for textile sizing on the market is medium and high viscosity powder products, and the chloride content is 5-7%. It can only be used as an auxiliary sizing agent to assist low-viscosity oxidized starch in sizing, and oxidized starch is currently Can only carry out sizing to low-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12D06M15/09
Inventor 陈网根朱国生
Owner HANGZHOU HONGBO NEW MATERIALS
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