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Preparation method for amphoteric hydroxypropyl guar gum derivative

A technology of amphoteric hydroxypropyl guar gum and hydroxypropyl guar gum, which is applied in the field of preparation of guar gum derivatives, can solve the problems of low production efficiency, complicated processes, difficult solid-liquid separation and the like, and achieves easy control of reaction , the reaction conditions are mild, and the method is simple and easy to implement.

Inactive Publication Date: 2014-07-30
昆山京昆油田化学科技有限公司
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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 the continuous ethanol treatment method, which is complicated in process, difficult in solid-liquid separation, low in production efficiency, and the storage stability of the product aqueous solution is poor, and stratification occurs after one week at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 7°C, 4g of hydroxypropyl guar gum with a molar substitution of 0.8 was added to 25ml of dichloromethane solution, and 25ml of a pyridine solution of p-toluenesulfonyl chloride with a mass concentration of 32% was added dropwise within 1h while stirring. Raise the temperature to 15°C and react for 10 hours, pour the reaction solution into ethanol to fully precipitate the tosylate hydroxypropyl guar gum product; add it to 20ml of ethanolamine, stir and mix evenly, heat up to 40°C and react for 48 hours, Pour the reaction solution into acetone to precipitate, and then repeat the washing three times to obtain aminohydroxypropyl guar gum; take 2g and dissolve it in 50ml of 20% sodium hydroxide solution, stir and react at 30°C for 30min, within half an hour Add 6ml of 18g chloroacetic acid aqueous solution 50ml dropwise, raise the reaction temperature to 60°C and react for 2.5h, neutralize the reaction solution with hydrochloric acid solution after cooling, drop acetone i...

Embodiment 2

[0027] At 7°C, 4g of hydroxypropyl guar gum with a molar substitution of 1.5 was added into 25ml of pyridine solution, while stirring, 25ml of pyridine solution of p-toluenesulfonyl chloride with a mass concentration of 32% was added dropwise within 1h, and the temperature was raised to React at 15°C for 10h, pour the reaction solution into ethanol to fully precipitate the tosylate hydroxypropyl guar gum product; add 4g of the product to 20ml of ethanolamine and stir to mix evenly, heat up to 50°C for 10h, and Pour the reaction solution into acetone to precipitate it, and then repeat the washing three times to obtain aminohydroxypropyl guar gum; take 2g and dissolve it in 50ml of 20% sodium hydroxide solution, stir and react at 30°C for 30min, drop it within half an hour Add 6ml of 18g aqueous solution of chloroacetic acid, 50ml, raise the reaction temperature to 60°C and react for 2.5h, neutralize the reaction solution with hydrochloric acid solution after cooling, drop acet...

Embodiment 3

[0029] At 7°C, 4g of hydroxypropyl guar gum with a molar substitution of 1.5 was added to 30ml of pyridine solution, and 30ml of the pyridine solution of p-toluenesulfonyl chloride with a mass concentration of 33.3% was added dropwise while stirring, and the temperature was raised to React for 6 hours at 20°C, pour the reaction solution into ethanol to fully precipitate the tosylate hydroxypropyl guar gum product; add 4g of the product to the mixture of 10ml ethanolamine and 10ml N,N-dimethylformamide Stir and mix evenly, heat up to 50°C and react for 24 hours, pour the reaction solution into acetone to precipitate, and repeat washing three times to obtain aminohydroxypropyl guar gum; take 2g of 20% sodium hydroxide solution dissolved in 50ml 30°C, stirred and reacted for 30min, 6ml of 18g phosphoric acid aqueous solution 50ml was added dropwise within half an hour, the reaction temperature rose to 60°C and reacted for 2.5h, the reaction liquid was cooled and neutralized with...

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Abstract

The invention discloses a preparation method for an amphoteric hydroxypropyl guar gum derivative. The preparation method is characterized by comprising the following steps: (1) performing esterification reaction on hydroxypropyl guar gum and toluene sulfochloride to obtain hydroxypropyl guar gum tosylate; (2) employing an amination reagent to perform nucleophilic substitution on hydroxypropyl guar gum tosylate, removing tosylate group, so as to obtain an amino guar gum derivative; and (3) reacting the amino guar gum derivative under the catalysis of an acid, so as to obtain an amphoteric polymer containing both amino and carboxyl. The preparation method is a new method for preparing the amphoteric guar gum derivative in the field, and the method is simple and practicable, and the reactions are easy to control.

Description

technical field [0001] The invention belongs to the technical field of preparation of guar gum derivatives, in particular to a preparation method of amphoteric hydroxypropyl guar gum derivatives. Background technique [0002] Guar gum is a natural polysaccharide, its main chain is mannose connected by β-1,4 glycosidic bonds, and the side chain galactose is connected to the main chain by α-1,6 glycosidic bonds. Guar gum has good biocompatibility and biodegradability, and has broad application prospects in food, printing and dyeing, oil fields, mining, papermaking, water treatment, personal care, pharmaceuticals, agriculture, etc., but it has certain shortcomings , guar gum molecules are polyhydroxy compounds, lack of biologically active groups in the molecule, which makes it limited in biomedicine. Amphoteric guar gum refers to a class of guar gum derivatives that have both cationic groups and anionic groups on the guar gum molecular chain. As a potential biological materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
Inventor 彭树华何建平陈琼邓明宇唐志娟宋建锋崔俊杰陈卫平江波
Owner 昆山京昆油田化学科技有限公司
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