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A kind of preparation method of carboxymethyl cellulose potassium

A technology of carboxymethyl cellulose and refined cotton is applied in the field of chemical modification of natural polymer materials, which can solve the problems of low substitution degree and achieve the effects of high substitution degree, less equipment investment and simple process

Active Publication Date: 2011-12-21
CHONGQING LIHONG FINE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low degree of substitution of this method, few people use this method to prepare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A certain amount of shredded refined cotton, 2.0 times of 48% potassium hydroxide aqueous solution, 0.05 times of potassium hydroxide solid and 1.8 times of ethanol solution were put into the kneader at the same time, and after stirring for 80 minutes to alkalize, 1.1 times of chloroacetic acid The ethanol solution is uniformly sprayed into the kneader for carboxymethylation reaction. The temperature is raised to 60-90°C, and the reaction is continued for 40 minutes to obtain crude modified potassium carboxymethyl cellulose, which is washed, neutralized, centrifuged, dried, and pulverized to obtain the finished product of potassium carboxymethyl cellulose, which replaces The degree is 0.65, and the viscosity of 1% aqueous solution measured by NDJ-79 viscometer is 600mPa·s. The above multiples are based on the amount of refined cotton.

Embodiment 2

[0031] Put a certain amount of shredded refined cotton, 1.9 times of 48% potassium hydroxide aqueous solution, 0.1 times of potassium hydroxide solid and 1.8 times of ethanol solution into the kneader at the same time, stir and alkalinize for 80 minutes, and mix 1.1 times of chloroacetic acid The ethanol solution is uniformly sprayed into the kneader for carboxymethylation reaction. The temperature is raised to 60-90°C, and the reaction is continued for 40 minutes to obtain crude modified potassium carboxymethyl cellulose, which is washed, neutralized, centrifuged, dried, and pulverized to obtain the finished product of potassium carboxymethyl cellulose, which replaces The degree is 0.68, and the viscosity of 1% aqueous solution measured by NDJ-79 viscometer is 620mPa·s. The above multiples are based on the amount of refined cotton.

Embodiment 3

[0033] Put a certain amount of shredded refined cotton, 2.7 times of 48% potassium hydroxide aqueous solution, 0.1 times of potassium hydroxide solid and 1.8 times of ethanol solution into the kneader at the same time. The solution is uniformly sprayed into the kneader for carboxymethylation reaction. The temperature is raised to 60-90°C, and the reaction is continued for 40 minutes to obtain crude modified potassium carboxymethyl cellulose, which is washed, neutralized, centrifuged, dried, and pulverized to obtain the finished product of potassium carboxymethyl cellulose, which replaces The degree is 0.70, and the viscosity of 1% aqueous solution measured by NDJ-79 viscometer is 310mPa·s. The above multiples are based on the amount of refined cotton.

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Abstract

The invention provides a method for producing potassium carboxymethylcellulose by a kneading method, which comprises the following steps of: alkalizing cellulose by high-concentration potassium hydroxide liquid and industrial potassium hydroxide solid to generate alkali cellulose; after the generated alkali cellulose is subjected to carboxymethylation of chloroacetic acid, adding the potassium hydroxide liquid and the industrial potassium hydroxide solid again to carry out secondary alkalization; then adding chloroacetic acid to carry out secondary carboxymethylation treatment; and washing, neutralizing, centrifuging, drying and grinding to obtain the potassium carboxymethylcellulose product. The product not only has good dissolubility, but also has simple production process, short reaction period, low equipment investment and low raw material consumption.

Description

technical field [0001] The invention relates to a preparation method of carboxymethyl cellulose potassium, which belongs to the field of chemical modification of natural polymer materials. technical background [0002] Potassium carboxymethyl cellulose is a water-soluble fiber derivative obtained by alkalization and etherification of refined cotton with potassium hydroxide and chloroacetic acid under alkaline conditions. In the food industry, CMC-Na has been used as a common food additive. However, studies have found that excessive intake of sodium ions can lead to diseases such as diabetes, hypertension, and cardiovascular disease. Therefore, it is necessary to reduce the amount of sodium consumed in daily life At the same time, some potassium salts can be used instead of sodium salts; in the petroleum industry, well collapse and drill sticking often occur in the process of water-based drilling. caused by chemical expansion and dispersion. Therefore, the use of chemical a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12
Inventor 李友琦邵自强郭鸿雁陈洋溢王飞俊王文俊陈静
Owner CHONGQING LIHONG FINE CHEM
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