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One-step preparation method of amphoteric guar gum

A technology of amphoteric guar gum and step method, which is applied in the direction of adding reinforcing agent and retention aid, which can solve the problems of being inseparable, located in the same chain link, or in different chain links, etc., so as to improve dry strength, Obvious effect, strong anti-ion interference effect

Inactive Publication Date: 2011-02-16
WUXI JINXIN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the amphoteric guar gum formed by the above method, the anion and cationic substituents are not in the same position in the amphoteric guar gum. The anion and cationic substituents may be located in the same chain segment or in different chain segments, which is a complex The mixture, because the properties of guar gum and its derivatives are not much different, basically cannot be separated, which is an unavoidable problem in the synthesis of guar gum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 65 grams of ethylenediamine aqueous solution with a mass concentration of 40% into a four-neck flask, add 50 grams of chloroacetic acid dropwise under stirring, control the pH value to 8.5, rise to 50 °C, and react for 8 h. After the reaction, distill under reduced pressure and add concentrated hydrochloric acid to precipitate a white solid, which is purified with a mixed solvent of acetone and ethanol to obtain white columnar crystals, namely glycine hydrochloride (DMGC). The prepared aminoacetic acid hydrochloride and sodium carbonate were dispersed in acetone, 20 g of epichlorohydrin was added dropwise, the temperature was raised to 50° C., and the mixture was reacted for 4 hours. After the reaction was completed, the acetone was distilled off under reduced pressure to obtain a transparent viscous light yellow liquid, which was the obtained amphoteric intermediate. Add 50 grams of guar collagen powder in the reaction kettle, add 10 grams of sodium hydroxide and 7...

Embodiment 2

[0022] Add 60 grams of diethylamine aqueous solution with a mass concentration of 35% into a four-neck flask, add 40 grams of chloroacetic acid dropwise under stirring, control the pH value to 8.0, rise to 55°C, and react for 7 hours. After the reaction, distill under reduced pressure and add concentrated hydrochloric acid to precipitate a white solid, which is purified with a mixed solvent of acetone and ethanol to obtain white columnar crystals, namely glycine hydrochloride (DMGC). The prepared aminoacetic acid hydrochloride and sodium carbonate were dispersed in ethanol, 15 g of epichlorohydrin was added dropwise, the temperature was raised to 50° C., and the mixture was reacted for 5 hours. After the reaction was over, the ethanol was distilled off under reduced pressure to obtain a transparent viscous light yellow liquid, which was the obtained amphoteric intermediate. Add 50 grams of guar collagen powder in the reaction kettle, add 15 grams of sodium hydroxide and 90 gra...

Embodiment 3

[0024] Add 80 grams of dimethylamine aqueous solution with a mass concentration of 30% into a four-neck flask, add 70 grams of chloroacetic acid dropwise under stirring, control the pH value to 9.0, raise the temperature to 70°C, and react for 9 hours. After the reaction, distill under reduced pressure and add concentrated hydrochloric acid to precipitate a white solid, which is purified with a mixed solvent of acetone and ethanol to obtain white columnar crystals, namely glycine hydrochloride (DMGC). The prepared glycine hydrochloride and sodium carbonate were dispersed in isopropanol, 30 g of epichlorohydrin was added dropwise, the temperature was raised to 70° C., and the reaction was carried out for 6 hours. After the reaction was completed, the isopropanol was distilled off under reduced pressure to obtain a transparent viscous light yellow liquid, which was the obtained amphoteric intermediate. Add 50 grams of guar collagen powder in the reaction kettle, add 50 grams of ...

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Abstract

The invention relates to a one-step preparation method of amphoteric guar gum, belonging to the technical field of guar gum modification. The preparation method disclosed by the invention comprises the following steps: (1) adding a certain amount of chloroacetic acid to an amine aqueous solution at room temperature, and controlling the pH value to be 7-10 for reaction to prepare glycine hydrochloride; (2) dispersing the glycine hydrochloride and low-carbon alkylene oxide in a weak polar or non-polar solvent to be subject to a reaction at 50-70 DEG C to prepare an amphoteric intermediate; (3) adding raw guar gum powder to the weak polar or non-polar solvent at normal temperature, adding a basic catalyst to carry out basic catalysis; and (4) adding the amphoteric intermediate to be subject to an etherification reaction at a pressure of 0.05-0.33MPa, and collecting the amphoteric guar gum product from the reaction product. The prepared product has high ion interference resistance and salinity tolerance. Besides, the product can be used as a retention and drainage aid for paper making and achieves obvious effects and high paper formation. When the product is used as an intensifier, the dry strength of paper can be obviously improved, and the softness of paper can not be reduced.

Description

technical field [0001] The invention relates to a one-step preparation method of amphoteric guar gum, belonging to the technical field of guar gum modification. Background technique [0002] Guar gum is a plant gum that is isolated, extracted and purified from the endosperm of guar beans widely planted in India and Pakistan. Its main component is galactomannan, which is a non-ionic polysaccharide in terms of its molecular structure. The main chain is composed of (1~4)-β-D-mannose as units, and the side chain is composed of a single α- D-Galactose is composed of (1-6) bonds connected to the main chain, and the ratio of mannose / galactose is 2:1. The relative molecular mass of guar gum is generally between 200,000 and 2 million. Because it grows in a high temperature, arid and water-scarce environment, guar gum is soluble in cold water. In particular, the molecular configuration of guar gum is very similar to cellulose. This similarity makes it have a strong affinity for cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18C08B37/00D21H21/10
Inventor 许超张荣龙柱曹军胜刘海水戴吕
Owner WUXI JINXIN GRP CO LTD
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