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Production method of water-soluble hydroxyethyl cellulose

一种羟乙基纤维素、制造方法的技术，应用在纤维素纸浆后处理改性、纸浆性质改性等方向，能够解决数量减少、难以表现出水溶性、平均加成摩尔数降低等问题

Active Publication Date: 2022-05-03
SUMITOMO SEIKA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in hydroxyethyl cellulose produced by suppressing the amount of ethylene oxide used, the average added mole number of ethylene oxide decreases, and the number of hydroxyethyl groups as hydrophilic groups decreases accordingly, so it is difficult to exhibit water solubility

Method used

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  • Production method of water-soluble hydroxyethyl cellulose
  • Production method of water-soluble hydroxyethyl cellulose
  • Production method of water-soluble hydroxyethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] In the production of the target hydroxyethyl cellulose, the obtained basic cellulose is reacted with ethylene oxide. Here, alkaline cellulose and ethylene oxide are charged into a reaction container, and the reaction is performed while stirring them. At this time, the reaction solvent may be put into the reaction container at the same time, and the alkali cellulose and ethylene oxide may be reacted in the reaction solvent. Using a reaction solvent can promote the uniform reaction of each glucose unit of alkaline cellulose and ethylene oxide.

[0036] The amount of ethylene oxide used is controlled so that in the produced hydroxyethyl cellulose, the average number of added moles of ethylene oxide per glucose unit reaches 0.1 to 1.0 moles (more than 0.1 moles and 1.0 moles the following). In particular, in a preferred aspect of the production method, control is performed so that the above-mentioned average added mole number of ethylene oxide becomes 0.1 mol or more and ...

Embodiment

[0053] Hereinafter, although an Example, a comparative example, etc. are given and this invention is demonstrated concretely, this invention is not limited by these Examples etc. at all.

[0054] In the Examples, etc., the average number of added moles of ethylene oxide per glucose unit of hydroxyethyl cellulose is supervised by the Ministry of Health, Welfare and Pharmaceutical Affairs Bureau of Japan, Standards for Pharmaceutical Additives 1993, Yaoji Daily Co., Ltd., 250 items - Items necessary for the measurement of the device described in Item 254 "Hydroxyethyl Cellulose, Quantitative Method" are calculated from these measurement items. Specifically, it is as follows. It should be noted that A to H in the following description are diagrams of the above-mentioned device described in the above-mentioned Pharmaceutical Additives Standard 1993 ( figure 1 ) mark symbol.

[0055] 0.075 g (a) of hydroxyethylcellulose dried at 105 degreeC for 2 hours was put into the decomposit...

Embodiment 1

[0077] 150 g of wet cake-like alkaline cellulose obtained in the production example, 3.5 g of ethylene oxide, and 50 g of methyl isobutyl ketone were charged into a kneader with a volume of 1 L while controlling the temperature to 15° C. Stir and mix at this temperature for 30 minutes. Next, the temperature was raised to 50° C. while heating while stirring and mixing was continued, and the basic cellulose and ethylene oxide were reacted for 3 hours.

[0078] The wet cake obtained by filtering off the reactant in the kneader was washed with a washing solvent composed of 100 g of methyl isobutyl ketone, 100 g of methanol, and 50 g of water. Further, the wet cake was further washed and neutralized with 50 g of a neutralization solvent prepared by adding 2 g of acetic acid to a washing solvent of the same composition to obtain 180 g of a neutralized wet cake. Then, this neutralized wet cake was dried to obtain 50 g of hydroxyethylcellulose.

[0079] Next, the obtained hydroxyeth...

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Abstract

The basic cellulose is reacted with ethylene oxide so that the average added moles of ethylene oxide per glucose unit reaches 0.1-1.0 moles, thereby preparing hydroxyethyl cellulose, and the prepared hydroxyethyl cellulose The element is mechanically pulverized to produce water-soluble hydroxyethyl cellulose. According to this production method, water-soluble hydroxyethyl cellulose can be produced from alkaline cellulose while suppressing the amount of ethylene oxide used. In addition, water-soluble hydroxyethylcellulose produced by this production method usually has a loss tangent (tan δ) of a 2% by mass aqueous solution of less than 1.0 in the frequency range of 0.1 to 100 rad / s, showing gel physical properties.

Description

technical field [0001] The present invention relates to a method for producing water-soluble hydroxyethyl cellulose, particularly a method for producing water-soluble hydroxyethyl cellulose by reacting alkaline cellulose with ethylene oxide. Background technique [0002] Water-soluble hydroxyethyl cellulose is a semi-synthetic polymer made of cellulose and has the characteristics of a non-ionic water-soluble polymer. Therefore, it is used in various industrial fields represented by cosmetics, pharmaceuticals and toilet products. It is widely used as thickener, emulsion stabilizer, dispersant, water retaining agent or protective colloid agent, etc. [0003] Water-soluble hydroxyethyl cellulose is usually produced by either the slurry method or the alkaline cellulose method. [0004] The slurry method is to prepare alkaline cellulose by reacting cellulose with an alkali such as an alkali metal hydroxide in a hydrophilic organic solvent as a reaction solvent, and continuously ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/08
CPCC08B11/08C08L1/284D21C9/007D21H11/20D21C9/005C08B1/00C08B11/22C08B11/20
Inventor 山内洋增田刚西川佑亮新开裕二
Owner SUMITOMO SEIKA CHEM CO LTD
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