Method for preparing hydroxyethyl cellulose

A technology of hydroxyethyl cellulose and alkali cellulose, applied in the field of cellulose, to achieve high viscosity, improve construction efficiency, and reduce difficulty

Pending Publication Date: 2018-08-21
高密银鹰新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of hydroxyethyl cellulose to solve the problems in the prior art that there are many gel particles in hydroxyethyl cellulose, low viscosity, long production process and stable viscosity. Poor performance, low construction flexibility, easy caking in storage, etc., and the technology of the present invention improves the utilization rate of ethylene oxide. Therefore, the technical solution provided by the present invention is:

Method used

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  • Method for preparing hydroxyethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 A method for preparing hydroxyethyl cellulose includes the following preparation steps:

[0042] (1) Preparation of alkali cellulose

[0043] Add 7 parts by mass of isopropanol and 1.05 parts by mass of water into the reactor, then add 0.28 parts by mass of sodium hydroxide, mix well and add 1 part by mass of pulverized pulp with degree of polymerization ≥1000, nitrogen atmosphere The alkalization is carried out under the control of 25℃ for alkalization temperature and 25min for alkalization time to swell the cellulose.

[0044] (2) Primary cellulose etherification

[0045] The alkali cellulose prepared in step (1) was added to 0.38 parts by mass of ethylene oxide, and then the temperature was raised to 60° C. to perform etherification of the cellulose once, and the etherification time was 70 min.

[0046] (3) Secondary etherification

[0047] After the primary cellulose etherification, the material is cooled to 30°C, 0.3 parts by mass of acetic acid is added to the mat...

Embodiment 2

[0050] Example 2 A preparation method of hydroxyethyl cellulose includes the following preparation steps:

[0051] 1) Preparation of alkali cellulose

[0052] Add 6.1 parts by mass of isopropanol, 0.5 parts by mass of ethanol, and 0.9 parts by mass of water into the reaction kettle, then add 0.3 parts by mass of sodium hydroxide, mix well and add 1 part by mass of pulverized polymerization degree ≥ 1000 pulp, alkalization under nitrogen atmosphere, alkalization temperature is controlled at 35℃, alkalization time is controlled at 35min, so that cellulose swells.

[0053] (2) Primary cellulose etherification

[0054] The alkali cellulose prepared in step (1) was added to 0.42 parts by mass of ethylene oxide, and then the temperature was raised to 60° C. to perform etherification of the cellulose once, and the etherification time was 85 minutes.

[0055] (3) Secondary etherification

[0056] After the first cellulose etherification, the material is cooled to 30°C, 0.33 parts by mass of ace...

Embodiment 3

[0059] Example 3 A preparation method of hydroxyethyl cellulose includes the following preparation steps:

[0060] 1) Preparation of alkali cellulose

[0061] Add 7 parts by mass of ethanol, 0.11 parts by mass of water into the reactor, and then add 0.29 parts by mass of sodium hydroxide, mix well and add 1 part by mass of pulverized pulp with a degree of polymerization of ≥1000, and alkali in a nitrogen atmosphere The alkalization temperature is controlled at 35℃, and the alkalization time is controlled at 50min to swell the cellulose.

[0062] (2) Primary cellulose etherification

[0063] The alkali cellulose prepared in step (1) was added to 0.3 parts by mass of ethylene oxide, and then the temperature was raised to 70° C. for a cellulose etherification, and the etherification time was 100 min.

[0064] (3) Secondary etherification

[0065] After the primary cellulose etherification is completed, the material is cooled to 40°C, 0.27 parts by mass of sulfuric acid is added to the mate...

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Abstract

The invention provides a method for preparing hydroxyethyl cellulose and belongs to the field of cellulose. The method comprises the following steps: preparing alkali cellulose, grinding pulp by adopting a grinder, adding a solvent and water into a reaction kettle, adding sodium hydroxide to be mixed and alkalifying with the ground pulp; the polymerization degree of the pulp is more than or equalto 1000. The alkalization temperature is 15-35 DEG C, and the alkalization time is 15-90 minutes. The hydroxyethyl cellulose prepared in the invention is excellent in viscosity stability, and when thehydroxyethyl cellulose is used as an additive, the overall stability of materials can be greatly improved, the hydroxyethyl cellulose is difficult react with other materials, the application field ofthe hydroxyethyl cellulose is wide, and the dispersion property is excellent. The hydroxyethyl cellulose prepared by the invention is small in amount of gel particles and can be widely applied to thefine chemical engineering fields such as environmental protection coatings, daily cosmetics, medicines and the like. The hydroxyethyl cellulose prepared by the invention is high in viscosity, and theproduction cost of downstream customers can be greatly reduced.

Description

Technical field [0001] The invention provides a method for preparing cellulose, particularly a method for preparing hydroxyethyl cellulose, which belongs to the field of cellulose. Background technique [0002] Hydroxyethyl cellulose is made from cellulose as raw material, after alkalization and etherification with ethylene oxide or chloroethanol. The appearance is white or slightly yellow. It is an odorless, non-toxic, environmentally friendly non-ionic Cellulose ether. As an important class of cellulose derivatives, hydroxyethyl cellulose is widely used in medicine and hygiene, daily chemical industry, papermaking, food, medicine, etc. due to its excellent water solubility, thickening, water retention, and compatibility. Construction, materials, water-based coatings and other industries. Among them, the coatings industry is the main target market for hydroxyethyl cellulose and a star additive that has been favored in recent years. [0003] At present, the domestic technology fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/08C08B1/08C08B11/20C08B15/00
CPCC08B1/08C08B11/08C08B11/20C08B15/005
Inventor 王致峰张媛媛
Owner 高密银鹰新材料股份有限公司
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