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Preparation method of hydroxyl-ethyl methyl cellulose

A technology of hydroxyethyl methyl and cellulose, applied in the field of preparation of hydroxyethyl methyl cellulose

Inactive Publication Date: 2012-09-26
新疆光大山河化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can be used instead of other cellulose ethers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present invention prepares the raw material weight portion of hydroxyethyl methyl cellulose and is equipped with: 700 parts of toluene and isopropanol mixture are used as solvent, 40 parts of water, 70 parts of sodium hydroxide, 85 parts of refined cotton, 20 parts of ethylene oxide, 90 parts, 16 parts of glacial acetic acid;

[0026] The specific steps are:

[0027] In the first step, in the reaction kettle, add a mixture of toluene and isopropanol, water, and sodium hydroxide, raise the temperature to 60°C, and keep the temperature for 40 minutes;

[0028] The second step, alkalization: cool the above materials to 30°C, add refined cotton, spray the mixture of toluene and isopropanol solvent, vacuumize to -0.006Mpa, fill with nitrogen for 3 replacements, and carry out alkalization after replacement , alkalization condition is: alkalization time is 2 hours, alkalization temperature is 50 ℃;

[0029] The third step, etherification: After the alkalization is comple...

Embodiment 2

[0034] The present invention prepares the raw material weight portion of hydroxyethyl methyl cellulose and is equipped with: 800 parts of toluene and isopropanol mixture are used as solvent, 30 parts of water, 80 parts of sodium hydroxide, 80 parts of refined cotton, 28 parts of ethylene oxide, 80 parts of methyl chloride, 19 parts of glacial acetic acid;

[0035] The specific steps are:

[0036] In the first step, in the reaction kettle, add a mixture of toluene and isopropanol, water, and sodium hydroxide, raise the temperature to 80°C, and keep the temperature for 20 minutes;

[0037] The second step, alkalization: cool the above materials to 50°C, add refined cotton, spray the mixture of toluene and isopropanol solvent, vacuumize to -0.006Mpa, fill with nitrogen for 3 replacements, and carry out alkalization after replacement , alkalization condition is: alkalization time is 2 hours, alkalization temperature is 30 ℃;

[0038] The third step, etherification: After the alk...

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PUM

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Abstract

The invention discloses a preparation method of hydroxyl-ethyl methyl cellulose; according to the method, refined cotton is used as the raw material, and ethylene oxide is used as the etherifying agent so as to prepare hydroxyl-ethyl methyl cellulose; compared with the existing cellulose ether technology, the hydroxyl-ethyl methyl cellulose prepared by the method has advantages that as the ethylene oxide is used as the etherifying agent to prepare the hydroxyl-ethyl methyl cellulose, the anti-mildew ability is high due to the hydroxyethyl group, and hydroxyl-ethyl methyl cellulose prepared by the method is high in the viscosity stability and the anti-mildew ability when being stored for a long time and can replace other cellulose ethers.

Description

technical field [0001] The invention relates to a preparation method of hydroxyethyl methylcellulose. Background technique [0002] The main characteristics of hydroxyethyl methylcellulose (HEMC) are: [0003] Soluble in water and some organic solvents, HEMC can be dissolved in cold water, its highest concentration only depends on the viscosity, the solubility changes with the viscosity, the lower the viscosity, the greater the solubility. [0004] Salt resistance: HEMC products are non-ionic cellulose ethers and are not polyelectrolytes, so they are relatively stable in aqueous solutions when metal salts or organic electrolytes exist, but excessive addition of electrolytes can cause gelation and precipitation. [0005] Surface activity: Due to the surface active function of the aqueous solution, it can be used as a colloidal protective agent, emulsifier and dispersant. [0006] Thermal gel: When the aqueous solution of HEMC products is heated to a certain temperature, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/193
Inventor 李坤田海滨李军平
Owner 新疆光大山河化工科技有限公司