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Method for preparing high-curing modified-guar-gum contained aqueous solution

A technology with high solid content and aqueous solution, which is applied in the direction of water repellent addition, inorganic compound addition, paper, etc. It can solve the problems of slow dissolution speed, difficult control of viscosity, high cost, etc., achieve high solid content, low viscosity, and improve production efficiency Effect

Active Publication Date: 2009-10-07
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural guar gum has the following disadvantages: high content of water insoluble matter; not fast swelling and hydration, slow dissolution rate; difficult to control viscosity; poor resistance to electrolytes and microbial degradation
[0008] The weak point of above-mentioned technology is, the concentration of modified guar gum aqueous solution is lower, and general solid content is less than 8%, and viscosity is generally greater than 3000mpa, is difficult to industrialization and mass production, and cost is higher

Method used

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  • Method for preparing high-curing modified-guar-gum contained aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 82.5 grams of water are added in a 500ml four-necked round-bottomed flask, 15 grams of cationic guar gum powder (water content 10%) are dispersed therein under electric stirring, 5 grams of 5% sodium acetate buffer solution is added, the pH of the system is 7.6, and 10 gram mannase (1000IU / g, solid content is 10%), then add 5 grams (90IU / g, solid content is 10%) galactose oxidase, be warming up to 50 degree of reaction 6 hours under stirring, after Raise the temperature to 90°C and keep it warm for 50 minutes, then cool down to 25°C to obtain a light yellow transparent liquid. The solid content is 11%, the viscosity is 500mpa.s, and the viscosity is measured by NDJ-1 type rotational viscometer according to ISO 2884-2-2003.

[0026] Cationic guar gum powder adopts CG-40, a product of Shanghai Gaowei Chemical Co., Ltd.;

[0027] Mannosidase using PuraBrite from GENENCOR INTERNATIONAL INC. TM , the activity unit is 1000IU / g, and the solid content is 10-12%;

[0028] The...

Embodiment 2

[0030] Add 114 grams of deionized water into a 500ml four-necked round bottom flask, turn on electric stirring, disperse 18 grams of hydroxypropyl guar gum powder (water content 10%) wherein, add 5 grams of 5% calcium acetate buffer solution, the pH of the system is 7 .3, add 15 grams of mannase (1000IU / g, solid content is 10%), then add 20 grams of galactose oxidase (90IU / g, solid content is 10%), be warming up to 40 degrees of reaction under stirring Hours, then raise the temperature to 90°C and keep it warm for 30 minutes, then cool down to 25°C to obtain a light yellow transparent liquid. The solid content is 15.0%, the viscosity is 200mpa.s, and the viscosity is measured by NDJ-1 type rotational viscometer according to ISO 2884-2-2003.

[0031] Hydroxypropyl guar gum is the Jaguar8060 of Rhodesia Company, and other raw materials are with embodiment 1.

Embodiment 3

[0033] Add 110 grams of deionized water into a 500ml four-necked round-bottomed flask, turn on electric stirring, disperse 7 grams of hydroxypropyl guar gum powder and 8 grams of cationic guar gum powder (water content 10%), add 5 grams of 5% phosphoric acid Sodium hydrogen disodium buffer solution, the pH of the system is 7.8, add 10 grams of mannase (1000IU / g, solid content is 10%), then add 5 grams of galactose oxidase (90IU / g, solid content is 10%) , heated to 50 degrees under stirring for 6 hours, then raised to 95 degrees and kept for 10 minutes, and then cooled to below 30 degrees to obtain a light yellow transparent liquid. The solid content is 10.5%, the viscosity is 356mpa.s, and the viscosity is measured by NDJ-1 type rotational viscometer according to ISO 2884-2-2003.

[0034] The source of raw materials is the same as in Example 1.

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Abstract

The invention discloses a modified guar gum aqueous solution with high solid content and a preparation method thereof. The modified guar gum powder used can be hydroxypropyl guar gum, cationic guar gum or a mixture thereof. Disperse the modified guar gum powder in water, the viscosity is greater than 3000MPa.s, use mannase and galactose oxidase to carry out enzyme-catalyzed reaction, and react at 40-60°C for 4-8 hours to obtain low viscosity and solid content The high modified guar gum aqueous solution has a viscosity of about 200-500MPa.s and a solid content of 10-25%. Mix this solution with AKD emulsion as the internal sizing agent in the pulp, and the addition amount is 4% of the absolute dry weight of the AKD emulsion, and the Cobb value is significantly reduced; use this liquid as the pulp surface sizing agent for papermaking, and the commercially available surface sizing agent Compared with the agent, the Cobb value of paper off-machine and ripening can be significantly reduced.

Description

technical field [0001] The invention relates to a sizing aid for papermaking, in particular to a method for preparing a modified guar gum aqueous solution Background technique [0002] At present, guar gum and its modified products are used in cosmetics, petroleum drilling, food, medicine, textile, construction and papermaking and other industries. In recent years, especially in the paper industry, the application of modified guar gum has become more and more extensive, and its function has been more and more recognized by people. [0003] Guar gum is a kind of natural galactose, with (1-4)-β-D mannose as the main chain skeleton, and the side chain is composed of a single α-D-galactopyranose, and (1- 6) The keys are connected. There is a galactose branch every other mannose, and the ratio of the two is about 2:1. Guar gum can be dispersed in water to form a high-viscosity liquid. Generally, the viscosity of a 1% aqueous solution of guar collagen powder is 4000-6000mpa.s. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16D21H17/32D21H17/22D21H17/66
Inventor 施晓旦卜莹田久旺
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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