A kind of preparation method of carboxymethyl hydroxyethyl guar gum

A technology of carboxymethyl hydroxyethyl guar and guar gum powder, which is applied in the field of polymer chemical materials, can solve the problems of high water-insoluble content, microbial decomposition, and high risk factor, and achieve good printing softness and preparation methods Simple, efficient color-gaining effect

Active Publication Date: 2017-12-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) High content of water insoluble matter;
[0005] (2) It cannot quickly swell and hydrate, and the dissolution rate is slow;
[0006] (3) The viscosity is not easy to control;
[0007] (4) The shear resistance is weak;
[0008] (5) It is easy to be decomposed by microorganisms and cannot be stored for a long time, etc.
[0015] The disadvantage of the above technology is that the use of epoxy-alkylene etherification agent is highly toxic and has a high risk factor, making the actual production very dangerous
Yet, the report of preparation of hydroxyethyl modified guar gum is seldom in previous domestic and foreign literature, especially the method for preparing this compound type product of carboxymethyl hydroxyethyl guar gum has not been mentioned yet.

Method used

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  • A kind of preparation method of carboxymethyl hydroxyethyl guar gum
  • A kind of preparation method of carboxymethyl hydroxyethyl guar gum
  • A kind of preparation method of carboxymethyl hydroxyethyl guar gum

Examples

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Effect test

Embodiment 1

[0051] A kind of preparation method of carboxymethyl hydroxyethyl guar gum, concrete steps are as follows:

[0052] (1) Alkalization reaction

[0053] At room temperature, 25g of guar collagen powder was added into a three-necked flask, and 60ml of methanol was added. Introduce nitrogen and stir, dissolve 4g of sodium hydroxide in 20ml of water, and drop into the flask, and react at 25°C for 30min;

[0054] (2) etherification reaction

[0055] Add 3ml of chloroethanol and 0.5g of tetrabutylammonium bisulfate catalyst into the three-necked flask. After reacting for 4 hours, without separating the product, directly add 4g of sodium hydroxide and 8g of sodium chloroacetate to the reaction system, and continue to react for 4 hours;

[0056] (3) Separation of products

[0057] Use acetic acid solution to adjust the pH of the reaction system to 7, filter with suction and fully wash with 75% methanol solution for 2-3 times. Transfer to an oven for drying at 60°C for 6 hours, pul...

Embodiment 2

[0059] A kind of preparation method of carboxymethyl hydroxyethyl guar gum, concrete steps are as follows:

[0060] (1) Alkalization reaction

[0061] At room temperature, 35g of guar collagen powder was added into a three-necked flask, and 90ml of ethanol was added. Introduce nitrogen and stir, disperse 5g of calcium hydroxide in 30ml of water, and drop into the flask, react at 30°C for 50min;

[0062] (2) etherification reaction

[0063] Add 6ml of chloroethanol and 1g of tetraethylammonium bromide catalyst into the three-necked flask. After reacting for 8 hours, without separating the product, directly add 5g of calcium hydroxide and 9g of calcium chloroacetate to the reaction system, and continue to react for 5 hours;

[0064] (3) Separation of products

[0065] Use acetic acid solution to adjust the pH of the reaction system to 7, filter with suction and fully wash with 75% ethanol solution for 2-3 times. Transfer to an oven for drying at 80°C for 4 hours, pulverize ...

Embodiment 3

[0067] A kind of preparation method of carboxymethyl hydroxyethyl guar gum, concrete steps are as follows:

[0068] (1) Alkalization reaction

[0069] At room temperature, 40g of guar collagen powder was added into a three-necked flask, and 120ml of isopropanol was added. Introduce nitrogen and stir, dissolve 5g of potassium hydroxide in 60ml of water, and drop into the flask, and react at 50°C for 6h;

[0070] (2) etherification reaction

[0071] Add 8ml of chlorohydrin and 1.5g of chain polyethylene glycol catalyst into the three-necked flask. After reacting for 12 hours, without separating the product, directly add 6 g of potassium hydroxide and 10 g of sodium potassium chloroacetate to the reaction system, and continue to react for 6 hours;

[0072] (3) Separation of products

[0073] Use acetic acid solution to adjust the pH of the reaction system to 7, filter with suction and fully wash with 75% isopropanol solution for 2-3 times. Transfer to an oven for drying at 8...

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Abstract

The invention discloses a preparation method of carboxymethyl hydroxyethyl guar gum, which belongs to the technical field of polymer chemical materials. The preparation method of the present invention consists of three steps of alkalization reaction, etherification reaction and product separation, comprising: adding guar collagen powder and ethanol into a reaction vessel, and adding sodium hydroxide aqueous solution dropwise under nitrogen atmosphere. After a period of time, add chloroethanol and catalyst to react for a certain period of time. Then sodium chloroacetate and sodium hydroxide were added to continue the reaction. Then use acetic acid to adjust the pH to 7, wash and filter with suction, dry and pulverize, and the obtained product is carboxymethyl hydroxyethyl guar gum. The product has the advantages of high thickening efficiency and good solubility, and can be used as a thickener, lubricant, and reinforcing agent in many industries such as oil fields, printing and dyeing, and papermaking.

Description

technical field [0001] The invention provides a preparation method of carboxymethyl hydroxyethyl guar gum, which belongs to the technical field of polymer chemical materials. Background technique [0002] Guar gum is a kind of natural plant seed gum, which is derived from guar beans, an annual leguminous plant widely cultivated in India, Pakistan and other places. Its chemical composition is galactomannan, its main chain is composed of D-mannose connected by β-(1,4) glycosidic bonds, and the side chain is D-galactose connected by α-(1,6) glycosidic bonds on the main chain. The average ratio of D-galactose to D-mannose is about 1:2. As a natural vegetable gum with the highest viscosity in aqueous solution, guar gum has been widely used in national economic production. For example, in the pulp and paper industry, guar gum can quickly bond and absorb with paper fibers, increase the contact points between fibers, increase the bonding area between fibers, and produce strong ad...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08B37/00
Inventor龙柱赵昱王长红张丹
OwnerJIANGNAN UNIV