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Method of preparing high viscosity carboxymethyl cellulose by slurry method

A carboxymethyl cellulose, ultra-high viscosity technology, applied in the field of polymer chemistry, can solve the problems of inability to produce carboxymethyl cellulose, uneven distribution of substituents, low utilization rate of etherification agent, etc., and shorten the production cycle , reduce energy consumption and save production cost

Inactive Publication Date: 2007-09-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carboxymethyl cellulose is generally produced by the water-medium method or the solvent method with a low liquor ratio. The utilization rate of etherification agent is low, the distribution of substituents is uneven, and the degree of substitution is low. Usually, only medium-viscosity and high-viscosity products can be produced, and special products cannot be produced. carboxymethyl cellulose such as extra high viscosity carboxymethyl cellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under stirring conditions, 32g of sodium hydroxide was added to 800g of isopropanol / water solution with a mass concentration of 85%, and then 60g of cotton cellulose with a degree of polymerization of 2550 was added, and the reaction device was evacuated and filled with nitrogen. After reacting for 1 hour, 75 g of chloroacetic acid / isopropanol solution containing 50% chloroacetic acid was added, and the temperature was raised to 60° C. for 1 hour. After the reaction, neutralize with glacial acetic acid / isopropanol solution, then wash, centrifuge, dry, and store against moisture.

[0025] According to the GB2005 test standard, the degree of substitution is 1.0 by the lime-alkali method, and the viscosity of the 1% aqueous solution is 8640mPa·s by the Brookfield viscometer at 25°C.

Embodiment 2

[0027] Under stirring condition, 28g sodium hydroxide is joined in the ethanol / water solution of 90% by 600g mass concentration, then add the cellulose 60g that the degree of polymerization is 2600, the reaction device is vacuumized and filled with nitrogen, reacts at 25 ℃ for 2 60 g of chloroacetic acid / ethanol solution containing 55% chloroacetic acid was added, and the temperature was raised to 75° C. for 1 hour. After the reaction, neutralize with hydrochloric acid / ethanol solution, then wash, centrifuge, dry, and store against moisture.

[0028] According to the GB2005 test standard, the degree of substitution is 0.87 by the lime-alkali method, and the viscosity of the 1% aqueous solution is 6780mPa·s by the Brookfield viscometer at 25°C.

Embodiment 3

[0030] Under stirring conditions, 35g of sodium hydroxide was added to 750g of isopropanol / ethanol solution with a mass concentration of 85%, and then 60g of cellulose with a degree of polymerization of 2600 was added, and the reaction device was evacuated and filled with nitrogen. After reacting for 1 hour, 60 g of chloroacetic acid isopropanol / ethanol solution containing 58% chloroacetic acid was added, and the temperature was raised to 78° C. for 45 minutes. After the reaction, neutralize with glacial acetic acid / ethanol solution, then wash, centrifuge, dry, and store against moisture.

[0031] According to the GB2005 test standard, the degree of substitution is 0.98 by the lime-alkali method, and the viscosity of the 1% aqueous solution is 7800mPa·s at 25°C by a Brookfield viscometer.

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Abstract

This invention relates to a preparation method of carboxymethyl cellulose with special high viscosity, in particular belonging to polymer chemistry technology, which technical program includes four steps namely cellulose activating reaction, etherification, neutralization reaction and cleaning. The key points of this invention are that slurry method can prepare the carboxymethyl cellulose with high degree of substitution and high viscosity, without the addition of cross-linker or hydrophobic reagent. The practical significance of this invention is that it can improve product performance, namely viscosity and substitution, so that it can be better used in oil drilling, textile, sewage treatment, food processing and other fields.

Description

technical field [0001] The invention relates to a method for preparing carboxymethyl cellulose, in particular to a method for preparing extra-high viscosity carboxymethyl cellulose by a slurry method, which belongs to the technical field of polymer chemistry. Background technique [0002] Carboxymethylcellulose is a water-soluble cellulose ether. It introduces sodium carboxymethyl group into the molecular chain of cellulose after alkalization and etherification. It belongs to ionic cellulose ether and has the characteristics of thickening, dispersing, film-forming, bonding and protective colloid. It is widely used in petroleum Drilling, textiles, printing and dyeing, coatings, building materials, papermaking, food, sewage treatment, daily chemicals, medicine and other fields. [0003] The technological performance of cellulose ether depends on the viscosity of its solution. Carboxymethyl with extra high viscosity can be used as thickener and fluid loss reducer in oil drill...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 邵自强王飞俊冯有郁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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