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Amphoteric guar gum, preparation method and application thereof

A technology of amphoteric guar gum and guar collagen, applied in application, food preparation, textile and papermaking, etc., can solve the problems of delamination, poor storage stability of product aqueous solution, large fluctuation of product viscosity, etc., to improve dry strength , high transparency, good viscosity stability effect

Active Publication Date: 2009-08-26
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation method of amphoteric guar gum is mainly continuous ethanol treatment method, such as the disclosed method of Chinese patent CN99105835, and its shortcoming is that the prepared product viscosity fluctuates greatly with the change of aqueous solution pH value (7~8), and the product aqueous solution The storage stability is poor, and stratification occurs after being placed at room temperature for a week

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 250 grams of isopropanol to the reaction kettle at room temperature, disperse 100 grams of guar collagen powder evenly, add 10 grams of 20% sodium hydroxide solution by weight, alkalize for 30 minutes, and add cationic etherifying agent 3-chloro - 20 grams of 2-hydroxypropyl-trimethylammonium chloride, be warming up to 40 ℃, heat preservation reaction 5 hours, then add anionic etherifying agent monochloroacetic acid 25 grams, continue heat preservation reaction 4 hours, then cooling discharge, use Acetic acid was used to neutralize the pH to 7.05, filtered by suction, dried and pulverized, sealed and packaged for use.

[0020] Disperse the product in deionized water with pH values ​​of 7.20, 7.54, and 7.82 to prepare a 1% aqueous solution. The measured viscosity (NDJ-1 viscometer, 25°C 4# rotor 60rpm) is 3642mPa.s and 3621mPa.s respectively , 3604mPa.s, placed at room temperature for two weeks without delamination.

Embodiment 2

[0022] Add 350 grams of industrial ethanol to the reaction kettle at room temperature, disperse 100 grams of guar collagen powder evenly, add 20 grams of sodium carbonate solution with a weight concentration of 5%, alkalinize for 10 minutes, and add cationic etherifying agent 2,3-epoxy Propyltrimethylammonium chloride 40 grams, heat up to 60 ° C, heat preservation reaction for 6 hours, then lower the temperature to 50 ° C, add anionic etherification agent sodium monochloroacetate 40 grams, heat preservation reaction for 5 hours, then cool down and discharge , neutralized with citric acid to pH 7.34, filtered with suction, dried and pulverized, sealed and packaged for use.

[0023] Disperse the product in deionized water with pH values ​​of 7.11, 7.48, and 7.87 to prepare a 1% aqueous solution. The measured viscosity (NDJ-1 viscometer, 25°C 4# rotor 60rpm) is 4235mPa.s and 4221mPa.s respectively , 4219mPa.s, placed at room temperature for two weeks without delamination.

Embodiment 3

[0025] Add 400 grams of petroleum ether to the reaction kettle at room temperature, disperse 100 grams of guar collagen powder evenly, add 60 grams of 10% magnesium hydroxide solution by weight, alkalinize for 60 minutes, add cationic etherification agent dimethyl methacrylate Aminoethyl ester monochloromethane quaternary ammonium 60 grams, heat up to 80 ° C, heat preservation reaction for 3 hours, then lower the temperature to 20 ° C, add anionic etherification agent vinyl acetate 55 grams, heat preservation reaction for 6 hours, then cool down and discharge , neutralized with acetic acid to pH 7.25, filtered with suction, dried and pulverized, sealed and packaged for use.

[0026] Disperse the product in deionized water with pH values ​​of 7.08, 7.50, and 7.92 to prepare a 1% aqueous solution. The measured viscosity (NDJ-1 viscometer, 25°C 4# rotor 60rpm) is 3897mPa.s and 3888mPa.s respectively , 3879mPa.s, placed at room temperature for two weeks without delamination.

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Abstract

The invention discloses amphoteric guar gum, a preparation method and application thereof. The preparation method comprises the following steps: (A) adding guar gum raw powder into a low-polar or non-polar solvent at normal temperature, and adding a basic catalyst aqueous solution into the solvent for soaking and basifying; (B) adding a cationic etherifying agent into the mixture under the pressure of between 0.05 and 0.3 Mpa; and (C) adding an anionic etherifying agent into the mixture to react, and adding a neutralizing agent to neutralize the mixture until pH is between 7 and 8, and collecting the amphoteric guar gum from reactant. The prepared product has excellent viscosity stability and higher transparency. As a thickening agent, the amphoteric guar gum can be applied to paper making, foods, textile and other fields; and as a reinforcing agent, the amphoteric guar gum can be applied to the field of paper making, and can obviously improve the baked strength of paper without reducing the softness of the paper.

Description

technical field [0001] The invention relates to a preparation method of amphoteric guar gum. technical background [0002] Guar gum is a kind of leguminous plant, which is a natural galactomannan, which mainly grows in the arid regions of India and Pakistan. The main chain of its chemical structure is (1,4)-β-D mannose as the unit, and the side The chain is composed of α-D galactose and connected to the main chain by (1,6) bonds. Galactose is randomly distributed on the main chain, and this basically linear but branched structure determines that the properties of guar gum are significantly different from those of unbranched, water-insoluble glucomannan. It has a similar molecular structure to cellulose, which determines that it has a natural affinity with cellulose. [0003] Guar collagen powder can only be dissolved in aqueous solution, but the defects such as slow dissolution of the original powder in aqueous solution and high content of water-insoluble substances limit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00D21H21/14D21H17/32A23L1/0526A23L29/238
Inventor 施晓旦李丽王养臣
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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