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Method of preparing high substitution degree low viscosity polyanionic cellulose

A polyanion, high degree of substitution technology, applied in the field of polymer chemistry, can solve the problems of low utilization rate of etherification agent, uneven distribution of substituents, etc., and achieve the effects of easy operation, improved performance indicators, and simplified reaction process

Inactive Publication Date: 2009-11-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carboxymethyl cellulose is generally produced by water-medium method or solvent method with low bath ratio, the utilization rate of etherification agent is low, the distribution of substituents is uneven, and the degree of substitution is generally less than 1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under stirring conditions, 40g of sodium hydroxide was added to 700g of isopropanol / water solution with a mass concentration of 85%, at a temperature of 15°C, 1.0g of hydrogen peroxide was added, and then cotton cellulose with a degree of polymerization of 936 was added 60g, react at 20°C for 60 minutes; add 90g of chloroacetic acid / isopropanol mixed solution containing 50% chloroacetic acid, heat up to 60°C for 40 minutes, then heat up to 75°C for 60 minutes; after the reaction, the reaction The system was cooled to 30°C, neutralized with glacial acetic acid / isopropanol solution, then washed, centrifuged, and dried; moisture-proof storage.

[0021] According to the GB2005 test standard, the degree of substitution of the product was determined to be 1.21, and the viscosity of the 2% aqueous solution was tested by a Brookfield viscometer at 25°C to be 50mPas.

Embodiment 2

[0023] Under agitation, 40g of sodium hydroxide was added to 600g of ethanol / water solution with a mass concentration of 90%. At a temperature of 20°C, 0.5g of hydrogen peroxide was added, and then 70g of cotton cellulose with a degree of polymerization of 936 was added. React at 25°C for 100 minutes, add 105g of chloroacetic acid / ethanol mixed solution containing 55% chloroacetic acid, heat up to 55°C for 60 minutes, then heat up to 78°C for 40 minutes; after the reaction, cool the reaction system to 25 ℃, neutralized with hydrochloric acid / ethanol solution, then washed, centrifuged, and dried; moisture-proof storage.

[0024] According to the GB2005 test standard, the degree of substitution of the product is determined to be 1.16, and the viscosity of the 2% aqueous solution is 45mPas at 25°C with a Brookfield viscometer test result.

Embodiment 3

[0026] Under stirring conditions, 55g of sodium hydroxide was added to 550g of isopropanol / ethanol solution with a mass concentration of 85%, at a temperature of 18°C, 0.75g of hydrogen peroxide was added, and then wood fiber with a degree of polymerization of 1150 was added 60g of element, react at 30°C for 90 minutes, add 116g of chloroacetic acid / isopropanol / ethanol mixed solution containing 58% chloroacetic acid, heat up to 65°C for 40 minutes, then heat up to 70°C for 60 minutes; after the reaction , the reaction system was cooled to 35°C, neutralized with glacial acetic acid / ethanol solution, then washed, centrifuged, and dried; moisture-proof storage.

[0027] According to the GB2005 test standard, the degree of substitution of the product is determined to be 1.29, and the viscosity of the 2% aqueous solution is 145mPas at 25°C with a Brookfield viscometer.

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Abstract

The invention relates to a preparation method of polyanionic cellulose with high substitution degree and low viscosity, and particularly belongs to the technical field of polymer chemistry. The technical scheme can be divided into four reaction steps: cellulose activation reaction, two-stage etherification reaction, neutralization reaction, and precipitation washing. The inventive point of the present invention is to pre-add an oxidizing agent in the reaction system, and simultaneously reduce the viscosity during the reaction by adopting the slurry method, so that the polyanion cellulose with high substitution degree and low viscosity can be prepared. The practical significance of the present invention is that polyanionic cellulose products with high degree of substitution and low viscosity can be obtained, which can be better applied to the fields of oil drilling fluid, food processing, papermaking, etc. Viscosity reduction at the same time can simplify the reaction process, save production costs, shorten the preparation cycle, and reduce energy consumption.

Description

technical field [0001] The invention relates to a method for preparing polyanion cellulose, in particular to a method for preparing polyanion cellulose with high substitution degree and low viscosity, which belongs to the technical field of polymer chemistry. Background technique [0002] Polyanionic cellulose, referred to as PAC, 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] Polyanionic cellulose has basically the same structure as carboxymethyl cellulose, but the distribution of substituents is more uniform. Carboxymethyl cellulose is general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/193C08B11/20C08B1/06
Inventor 邵自强王飞俊王文俊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY