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High-curing modified-guar-gum-contained aqueous solution and preparing method

A water solution and guar gum technology, applied in the direction of water-repellent addition, inorganic compound addition, paper, etc., can solve the problems of high water-insoluble content, difficult industrialization and mass production of preparation methods, and slow dissolution speed, reaching Cobb The effect of lowering the value

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
Its weak point is that the concentration of modified guar gum aqueous solution is low, and its preparation method is difficult to industrialization and mass production, and cost is higher

Method used

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  • High-curing modified-guar-gum-contained aqueous solution and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 200 grams of ethanol with a volume concentration of 95% into a 1000 ml four-neck flask, turn on electric stirring, take 100 grams of guar collagen powder (10% water content) and disperse it, and adjust the pH to pH=10 with 0.05N sodium hydroxide. Add 8 grams of hydrogen peroxide (30%) with a dropping funnel and heat up to 80°C, react for 3 hours and cool down to 35°C, add 32 grams (25%) of lye, add 18 grams of 3-chloro-2-hydroxypropyl Trimethylammonium chloride, heated to 60°C for 5 hours, then cooled to 30°C, and neutralized to pH=8 with acetic acid. Vacuum filter the reaction product, wash the filter cake twice with 80% ethanol, filter, dry and pulverize to obtain a milky white powder with a water content of 10%. (the degree of cationic substitution of the gained modified guar gum powder is 0.1, measured by GB12309-90).

[0029] Add 62.4 grams of deionized water into a 500ml four-necked round-bottomed flask, turn on electric stirring, disperse 32 grams (water con...

Embodiment 2

[0031] Add 200 grams of methanol into a 1000 ml four-necked flask, turn on electric stirring, take 100 grams of guar collagen powder (10% water content) and disperse it, and adjust the pH to pH=11 with 0.05N potassium hydroxide. Add 10 grams of hydrogen peroxide (30%) at one time and heat up to 65°C, cool down to 35°C after 6 hours of reaction, add 37 grams (25%) of potassium hydroxide lye at one time, add 30 grams of epoxypropyl three For methyl ammonium chloride, heat up to 70°C for 5 hours, then cool down to below 30°C, and neutralize with hydrochloric acid to PH=8. Vacuum filter the reaction product, wash the filter cake twice with 80% ethanol, filter, dry and pulverize to obtain a milky white powder with a water content of 10%. (the degree of cationic substitution of the gained modified guar gum powder is 0.2, measured by GB12309-90)

[0032] 76 grams of water are added in a 500ml four-necked round-bottomed flask, and 18 grams (10% of water content) of the above-mentione...

Embodiment 3

[0034] Add 200 grams of isopropanol into a 1000 ml four-necked flask, turn on electric stirring, take 100 grams of guar collagen powder (10% water content) and disperse it, and adjust the pH to PH=11 with the supernatant of saturated calcium hydroxide solution. Add 5 grams of hydrogen peroxide (30%) at one time and heat up to 85°C, cool to 35°C after 5 hours of reaction, add calcium hydroxide slurry (25%) slurry at one time, add 10 grams of 4-chloro-2 -butenyltrimethylammonium chloride, heat up to 40°C for 3 hours, then heat up to 70°C for another 2 hours, then cool down to below 30°C, neutralize with citric acid to pH=8. Vacuum filter the reaction product, wash the filter cake twice with 80% ethanol, filter, dry and pulverize to obtain a milky white powder with a water content of 10%. (the degree of cationic substitution of the gained modified guar gum powder is 0.05, measured by GB 12309-90)

[0035]Add 115 grams of deionized water into a 500ml four-necked round-bottomed fl...

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Abstract

The invention discloses a high-solid-content modified guar gum aqueous solution and a preparation method thereof, comprising the following steps: adding cationic oxidized guar gum powder with a cationic substitution degree of 0.05 to 0.2 into water, adding a pH buffering agent, and adjusting the pH of the system 7-8, add mannosidase aqueous solution, add galactose oxidase aqueous solution, heat up to 40-60°C and react for 4-8 hours, then heat up to 90-95°C and keep for 10-50 minutes to obtain modified guar gum aqueous solution . The modified guar gum aqueous solution of high solid content prepared by the present invention can be used as papermaking sizing agent, and compared with pure AKD (emulsion, Cobb value can be significantly reduced; Compared with commercially available surface sizing agent, After sizing, the Cobb value of the paper after off-machine and aging decreased significantly.

Description

technical field [0001] The invention relates to a sizing aid for papermaking, in particular to an aqueous solution of cationic oxidized guar gum with high solid content and a preparation method thereof. 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 solu...

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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