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Preparation method of ultra-low-viscosity hydroxypropyl methyl cellulose

A technology of hydroxypropyl methylcellulose and viscosity, which is applied in the field of preparation of ultra-low viscosity hydroxypropyl methylcellulose, can solve the problems of no ultra-low viscosity hydroxypropyl methylcellulose preparation method, etc., and achieve reduction The effect of production cost, expansion of production volume, and expansion of application range

Inactive Publication Date: 2012-12-12
新疆光大山河化工科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is no effective method for preparing extra-low viscosity hydroxypropyl methylcellulose

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0019] The ratio of raw materials by weight for preparing ultra-low viscosity HPMC is: 70 parts of toluene isopropanol, 1 part of water, 8 parts of refined cotton, 7 parts of sodium hydroxide, 9 parts of methyl chloride, 3 parts of propylene oxide, and 1.5 parts of glacial acetic acid ;

[0020] Concrete preparation steps are:

[0021] The first step is to mix the raw materials: in the reaction kettle, after adding solvent, water and sodium hydroxide, the temperature of the alkali is raised to 70°C, and the temperature is kept for 30 minutes;

[0022] The second step, alkalization: lower the temperature of the above alkali to 30°C, add refined cotton, stir for 1 hour, and control the temperature at 25-40°C; carry out alkalization reaction; after the alkalization is completed, the reactor is evacuated to 0.05-0.07mpa , add propylene oxide, methyl chloride, keep for 30 minutes;

[0023] The third step, etherification: the temperature is raised to 55±3°C and kept for 1.5 hours;...

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Abstract

The invention discloses a preparation method of ultra-low-viscosity hydroxypropyl methyl cellulose, and the method is characterized in that purified cotton is adopted as a raw material, and epoxypropane and chloromethane are used as an etherifying agent to prepare the hydroxypropyl methyl cellulose (HPMC). The ultra-low-viscosity HPMC comprises following raw materials in parts by weight: 70 parts of methylbenzene isopropanol, one part of water, 8 parts of purified cotton, 7 parts of sodium hydroxide, 9 parts of chloromethane, 3 parts of epoxypropane and 1.5 parts of glacial acetic acid. The preparation method adopts the purified cotton as the raw material and adopts the epoxypropane and chloromethane as the etherifying agent to prepare HPMC. Due to the adoption of the preparation method, the production cost of the ultra-low-viscosity HPMC can be greatly reduced, the yielding capacity can be enlarged, and the application range of the ultra-low-viscosity HPMC is enlarged.

Description

[0001] technical field [0002] The invention relates to a preparation method of ultra-low viscosity hydroxypropyl methylcellulose. Background technique [0003] The English name of cellulose ether is cellulose ether, which is a polymer compound with ether structure made of cellulose. Each glucosyl ring in the cellulose macromolecule contains three hydroxyl groups, the primary hydroxyl group on the sixth carbon atom, the secondary hydroxyl group on the second and third carbon atoms, and the hydrogen in the hydroxyl group is replaced by a hydrocarbon group to generate cellulose ether derivatives It is a product in which the hydrogen of the hydroxyl group in the cellulose polymer is replaced by a hydrocarbon group. Cellulose is a polyhydroxy polymer compound that neither dissolves nor melts. After etherification, cellulose is soluble in water, dilute alkali solution and organic solvent, and has thermoplasticity. [0004] Hydroxypropyl methylcellulose (HPMC) is a non-ionic c...

Claims

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Application Information

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IPC IPC(8): C08B11/08
Inventor 李培芹高丽李振坤田海滨李军平
Owner 新疆光大山河化工科技有限公司