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Method for preparing powdery amphoteric guar gum derivative

A technology of amphoteric guar gum and derivatives, which is applied in the directions of reinforcing agent addition, paper, textile and papermaking, etc., can solve the problems of difficult post-processing, low product substitution, and the effect is not as good as high substitution, and achieves high substitution and lower The effect of improving cost and burst resistance index

Active Publication Date: 2010-10-27
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patented technologies use water method or organic solvent method. Not only must chemical additives such as anti-gelling agents be added, but also the post-processing is difficult. At the same time, the product has a low degree of substitution, and its effect as a paper strengthening agent is not as good as that of products with a high degree of substitution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve 2g of alkali in a mixture of 20ml of water and 3.5ml of ethanol, spray it into 50g of guar collagen powder and stir for 0.5h. The guar collagen powder was fully alkalized, and 10 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride was added within 0.5 h under stirring conditions, and the stirring was continued for 0.5 h. Then the temperature was raised to 65°C, and after 30 min of heat preservation, 8 g of sodium chloroacetate was added within 0.5 h under stirring conditions, and the stirring was continued for 0.5 h. The reaction temperature was maintained at 70°C, and after 4 hours of reaction, the temperature was lowered, and the pH value was adjusted to 7 with hydrochloric acid. The crude product is soaked in 95% ethanol, filtered, washed, and vacuum-dried to obtain amphoteric guar gum in the form of light yellow powder with high degree of substitution. The main technical parameters of the product are: nitrogen content 2.10%, cation substitution degree ...

Embodiment 2

[0019] Dissolve 2g of alkali in a mixture of 15ml of water and 3ml of ethanol, spray it into 50g of guar collagen powder and stir for 0.5h. The guar collagen powder was fully alkalized, and 7.5 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride was added within 0.5 h under stirring conditions, and the stirring was continued for 0.5 h. Then the temperature was raised to 65°C, and after 30 min of heat preservation, 5 g of sodium chloroacetate was added within 0.5 h under stirring conditions, and the stirring was continued for 0.5 h. The reaction temperature was maintained at 75°C, and after 4 hours of reaction, the temperature was lowered, and the pH value was adjusted to 7 with acetic acid. The crude product is soaked in 95% ethanol, filtered, washed, and vacuum-dried to obtain amphoteric guar gum in the form of light yellow powder with high degree of substitution. The main technical parameters of the product are: nitrogen content 1.80%, cation substitution degree 0.258, ...

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Abstract

The invention discloses a method for preparing powdery amphoteric guar gum derivative having high degree of substitution, which adopts a semidry method and completes the cationization and anionized reactions of guar gum in a same reactor at the same time. The method comprises the following steps of: preparing sodium hydroxide into solution by using an alcohol / water mixture; spraying the solution into guar gum raw powder; adding a powdery quaternized reagent into the alkaline guar gum with stirring; and reacting the mixture with a carboxyalkylation reagent to obtain the product. The method has the advantages of completing the cationization and anionized reactions of the guar gum in the same reactor at the same time, no need for the separation and purification of intermediate products, directly performing subsequent reactions, fully utilizing reaction heat in a synthesis process, reducing energy consumption and solving the problems of high cost, difficult post treatment and low product degree of substitution of modified guar gum prepared by an aqueous method or an organic solvent method in the prior art along with characteristics of the semi-dry method.

Description

technical field [0001] The invention relates to a preparation method of powdery amphoteric guar gum derivatives, in particular to a semi-dry method, which simultaneously completes the cationization and anionization reactions of guar gum in the same reactor, and prepares high-substitution powder Methods of amphoteric guar gum derivatives. Background technique [0002] Guar gum is a natural galactomannan gum extracted from the endosperm of guar bean seeds grown in India, Pakistan and elsewhere. The unique structural characteristics of guar gum determine that it is easy to be chemically modified, and its derivatives are widely used in the paper industry. Amphoteric guar gum is used as a paper strengthening agent in the paper industry. It has the effect of "anti-ion interference", and the interference to chemicals such as alum in the system is correspondingly reduced. It has a wide range of applications, not only suitable for acidic papermaking, but also suitable for medium-al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/32D21H21/18
Inventor 曹春昱彭建军刘小莉
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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