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Method for preparing high-viscosity modified guar gum

A guar gum, high viscosity technology, applied in the field of preparation of high viscosity modified guar gum, can solve the problems of complex synthesis steps, low viscosity, low degree of product substitution and the like

Inactive Publication Date: 2014-01-22
昆山市周市溴化锂溶液厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as U.S. Patents USP3326890, USP3350186, USP3483121, etc. disclose the preparation process of cationic guar gum, but these patented technologies have the defects of complex synthesis steps, low degree of substitution of products, or high degree of substitution and low viscosity

Method used

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  • Method for preparing high-viscosity modified guar gum
  • Method for preparing high-viscosity modified guar gum
  • Method for preparing high-viscosity modified guar gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Slowly add guar collagen powder into a 10wt% diethanolamine aqueous solution, and then add petroleum ether within 1 hour to obtain an alkalized guar gum solution;

[0020] (2) Add composite surfactant to the above alkalized guar gum solution, then add dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride within 2 hours, react at 50°C, and wash the product after the reaction , neutralization, suction filtration, drying, and pulverization to obtain the high-viscosity modified guar gum.

[0021] The parts by weight of each raw material in the above-mentioned steps are as follows:

[0022]

[0023] 20 parts of dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride.

[0024] The composite surfactant is compounded by sorbitan monooleate (Span 80) and sodium oleate in a weight ratio of 1:1.

[0025] According to GB12309-90, the cationic substitution degree is 0.7, and the viscosity (NDJ-1 viscometer, 25°C 4# rotor 60rpm) is 6200mPa.s.

Embodiment 2

[0027] (1) Slowly add guar collagen powder into an aqueous solution of triethanolamine with a concentration of 20wt%, and then add petroleum ether within 1-2 hours to obtain an alkalized guar gum solution;

[0028] (2) Add composite surfactant to the above-mentioned alkalized guar gum solution, then add dimethylaminoethyl acrylate monochloromethane quaternary ammonium within 3 hours, and react at 70°C. After the reaction, the product is washed and neutralized. and, suction filtration, drying, and pulverization to obtain the high-viscosity modified guar gum.

[0029] The parts by weight of each raw material in the above-mentioned steps are as follows:

[0030]

[0031] 80 parts of dimethylaminoethyl acrylate monochloromethane quaternary ammonium.

[0032] The composite surfactant is compounded by sorbitan monolaurate (Tween 21) and triethanolamine oleate at a ratio of 1:2.

[0033] According to GB12309-90, the cationic substitution degree is 0.85, and the viscosity (NDJ-1 ...

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Abstract

The invention discloses a method for preparing high-viscosity modified guar gum. The method comprises the steps as follows: guar gum raw powder is slowly added into a basic catalyst water solution with the concentration of 10 wt%-20 wt%, then a solvent is added within 1-2 hours, and a basified guar gum solution is obtained; and a composite surfactant is added into the basified guar gum solution, a cationic etherifying agent is added in 2-3 hours, a reaction occurs at the temperature of 50 DEG C-70 DEG C, and after the reaction, a product is washed, neutralized, leached, dried and crushed, so that the high-viscosity modified guar gum is obtained. The cationic guar gum product prepared with the method has higher cation substitution degree and viscosity, and can be applied to fields with higher retention and drainage requirements, such as papermaking, daily care and the like.

Description

technical field [0001] The invention relates to a preparation method of high-viscosity modified guar gum. Background technique [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 subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00
Inventor 吴冬琪
Owner 昆山市周市溴化锂溶液厂
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