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Preparation method of cross-linked Na-CMC (sodium carboxymethylcellulose) with ultra-high viscosity

A technology of cross-linking carboxymethyl and sodium cellulose, which is applied in the field of preparation of sodium carboxymethyl cellulose, can solve the problem that the viscosity of sodium carboxymethyl cellulose cannot reach the industrial ultra-high viscosity, and the sodium carboxymethyl cellulose is substituted by sodium carboxymethyl cellulose. High viscosity, unfavorable product viscosity and other problems, to achieve the effect of increased viscosity, convenient operation and simple process

Inactive Publication Date: 2015-02-25
JIANGYIN EVEREACHING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The substitution of sodium carboxymethylcellulose produced by this patent is too high, which is unfavorable to increase the viscosity of the product in theory, and the viscosity of sodium carboxymethylcellulose prepared according to this method still cannot meet the requirements of industrial ultra-high viscosity

Method used

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  • Preparation method of cross-linked Na-CMC (sodium carboxymethylcellulose) with ultra-high viscosity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Stir and mix 150.65kg of 48% sodium hydroxide aqueous solution and 140kg of 94.5% ethanol aqueous solution, and cool the mixture to 25°C for use; loosen 100kg of refined cotton into floc, put it into a 2000L kneader, and spray it into the kneader Drench the aforementioned sodium hydroxide / ethanol mixture, close the feeding port of the kneader to carry out the alkalization reaction, control the temperature of the alkalization reaction at 25°C, and react for 50 minutes; then, spray and drop 108.33kg of 75wt% ethanol chloroacetate into the kneader Liquid etherifying agent, while adding the etherifying agent dropwise, add the ethanol solution of 1,3-dichloropropanol to the kneader as a crosslinking agent, the total amount of 1,3-dichloropropanol added is 0.2kg, Pre-react at 30°C for 40 minutes; then raise the temperature of the reaction system to 75°C, and carry out etherification and heat preservation reaction for 50 minutes; after the reaction, cool the reaction product to...

Embodiment 2

[0027] Stir and mix 160.21kg of 40% sodium hydroxide aqueous solution and 132kg of 90% ethanol aqueous solution, and cool the mixture to 25°C for use; loosen 100kg of refined cotton into floc, put it into a 2000L kneader, and spray it into the kneader Drench the aforementioned sodium hydroxide / ethanol mixture, close the feeding port of the kneader to carry out the alkalization reaction, control the temperature of the alkalization reaction at 20°C, and react for 60 minutes; then, spray and drop 91.35kg of 75wt% ethanol chloroacetate into the kneader Liquid etherifying agent, while adding the etherifying agent dropwise, add the ethanol solution of 1,3-dichloropropanol to the kneader as a crosslinking agent, the total amount of 1,3-dichloropropanol added is 0.5kg, Pre-react at 40°C for 35 minutes; then raise the temperature of the reaction system to 80°C, and carry out etherification and heat preservation reaction for 60 minutes; after the reaction is completed, cool the reaction ...

Embodiment 3

[0030]Stir and mix 180.21kg of 45% sodium hydroxide aqueous solution and 160kg of 92% ethanol aqueous solution, cool the mixture to 25°C, and set aside; loosen 100kg of refined cotton into floc, put it into a 2000L kneader, and spray it into the kneader Drench the aforementioned sodium hydroxide / ethanol mixture, close the feeding port of the kneader to carry out the alkalization reaction, control the temperature of the alkalization reaction at 25°C, and react for 45min; then, spray and drop 105.75kg of 75wt% ethanol chloroacetate into the kneader Liquid etherifying agent, add the ethanol solution of 1,3-dichloropropanol to the kneader as a crosslinking agent while adding the etherifying agent dropwise, the total addition of 1,3-dichloropropanol is 0.8kg, Pre-react at 45°C for 40 minutes; then raise the temperature of the reaction system to 75°C, and carry out etherification and heat preservation for 80 minutes; after the reaction, cool the reaction product to below 50°C within ...

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Abstract

The invention relates to a preparation method of cross-linked Na-CMC (sodium carboxymethylcellulose) with ultra-high viscosity, mainly comprising alkali reaction, pre-reaction and etherification reaction, wherein the pre-reaction comprises initial etherification reaction and crosslinking reaction, and the initial etherification reaction and the crosslinking reaction can be carried out simultaneously, which is good for the generation of the cross-linked Na-CMC with uniform etherification reaction substitution, high molecular weight and ultra-high viscosity. The viscosity of 1% Na-CMC water solution, which is measured by a Brookfield viscometer under the degree of substitution of 0.9, is 10,000cps and improves by 40-50% compared with the viscosity of the existing Na-CMC. The preparation method has the advantages that no additional reaction products are generated, no complex reaction conditions are required, the process is simple, and the reaction condition is mild. The preparation method is convenient to operate and is suitable for industrial promotion and production.

Description

technical field [0001] The invention relates to a preparation method of carboxymethyl cellulose sodium, in particular to a preparation method of super-high viscosity croscarmellose sodium. Background technique [0002] Sodium carboxymethylcellulose (Na-CMC) is the etherification reaction of natural cellulose (usually cotton linter or wood pulp) with monochloroacetic acid under alkaline conditions, depending on the raw material specifications and cellulose D-glucose The situation that the hydroxyl hydrogen in the unit is replaced by carboxymethyl group is different, and the water-soluble polymer compounds with different molecular weight distributions and different degrees of substitution are obtained. Na-CMC with high viscosity has been widely used in industrial production such as daily detergent, construction and paint because of its many unique and excellent properties. [0003] When using the kneading method to produce Na-CMC, the methods to increase the viscosity of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12
Inventor 赵惠明周伟明
Owner JIANGYIN EVEREACHING CHEM
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