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Modified guar surface sizing agent and its preparing method and application

A surface sizing agent, guar gum technology, applied in the direction of adding water repellent, can solve the problems of reduced use effect, high water-insoluble content, slow dissolution rate, etc., to achieve improved ring pressure index, good compatibility, high substitution effect

Active Publication Date: 2010-06-02
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. After sexual intercourse, the above shortcomings can be significantly improved
[0005] Patents CN1936178 and CN1936179 have introduced high-solid modified guar gum aqueous solution and its preparation method. The guar gum molecule has cationic groups, which can be used as a sizing agent in the slurry when used together with AKD emulsion, which can reduce the use of AKD emulsion. amount, to reduce the Cobb value, but since the modified product has cationic groups, try to avoid mixing it with anionic additives when adding and using, otherwise it will easily cause flocculation and reduce the use effect

Method used

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  • Modified guar surface sizing agent and its preparing method and application

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Experimental program
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Effect test

Embodiment 1

[0024] Add 50 grams of methanol to the reaction kettle at normal temperature, after dispersing 50 grams of guar collagen powder evenly, add 6 grams of sodium hydroxide solution with a weight concentration of 50%, raise the temperature to 20 ° C, then slowly add 3 grams of epichlorohydrin, continue Heat preservation reaction for 5 hours, then slowly add 2 grams of etherification additive ethylene oxide, heat up to 70 ° C, heat preservation reaction for 1 hour, cool down and discharge, use 12 grams of hydrochloric acid to neutralize the pH to 7, suction filter, dry and pulverize, Sealed packaging ready to use.

Embodiment 2

[0026] Add 150 grams of petroleum ether in the reaction kettle at normal temperature, after dispersing 70 grams of guar collagen powder evenly, add 15 grams of triethanolamine solution with a weight concentration of 50%, raise the temperature to 50 ° C, then slowly add 5 grams of phosphorous trichloride, keep warm React for 2 hours, then slowly add 5 grams of etherification additive propylene oxide, then raise the temperature to 35 ° C, keep the temperature for 3 hours, cool down and discharge, use 16 grams of acetic acid to neutralize the pH to 8, filter with suction, dry and pulverize, seal Packaged and ready to use.

Embodiment 3

[0028] Add 200 grams of acetone in the reaction kettle at normal temperature, after dispersing 80 grams of guar collagen powder evenly, add 20 grams of 50% diethylenetriamine solution by weight concentration, heat up to 80 ° C, then slowly add 8 grams of sodium tripolyphosphate, Insulate and react for 7 hours, then slowly add 8 grams of etherification additive butylene oxide, then raise the temperature to 45°C, heat for 5 hours, cool down and discharge, neutralize the pH with 10 grams of sulfuric acid to 7, filter with suction, dry and pulverize , sealed and packaged for use.

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Abstract

The invention provides a modified guar gum surface sizing agent and a preparation method and an application thereof. The preparation method comprises the following steps of: (1) mixing a solvent 50 to300 weight parts with guar gum flour 50 to 100 weight parts; (2) mixing an alkaline catalyst 6 to 30 weight parts, heating to 25 to 70 DEG C, adding a cross-linking agent 1 to 10 weight parts and reacting for 2 to 7 h; (3) adjusting the pH value of the system to 6 to 9 by a neutralizing agent, adding an etherification auxiliary agent 2 to 15 weight parts, heating to 35 to 70 DEG C and keeping thetemperature and reacting for 1 to 6 h; and (4) adjusting the pH value to 7 to 8 by the neutralizing agent, and collecting the modified guar gum surface sizing agent from the result. The modified guargum surface sizing agent has the advantages of low viscosity, high substitution degree, good fluidity, good compatibility to other sizing agent. The sizing agent can significantly improve Cobb valueand ring crush index of paper sheet.

Description

technical field [0001] The invention relates to a modified guar gum used as a surface sizing agent and a preparation method thereof. The product of the invention can also be used as other kinds of paper strengthening agent. technical background [0002] At present, guar gum and its modified products are used in cosmetics, petroleum exploration, 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 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. The chain is composed of α-D galactose and connected to the main chain by (1,6) bonds. There is a galactose branch every other mannose, and the ratio of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16
Inventor 施晓旦李丽王养臣
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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