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Preparation method and application of hydrophobic modified guar gum

A technology of hydrophobic modification and guar gum, applied in the direction of adding water repellents, etc., can solve the problems of reduced molecular weight of guar gum, complicated modification process, etc., and achieve the effect of improving water solubility, good hydrophobic performance, and not easy to degrade

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN101210401 discloses modified guar gum surface sizing agent and its preparation method and application, through the reaction of guar gum and formaldehyde, metachloride or sodium phosphate tripolyphosphate cross-linking agent, increase the hydrophobicity of guar gum performance, but the modification process is complicated, and the molecular weight of guar gum decreases significantly after modification

Method used

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  • Preparation method and application of hydrophobic modified guar gum
  • Preparation method and application of hydrophobic modified guar gum
  • Preparation method and application of hydrophobic modified guar gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 50 gram guar gums are dispersed in 100 gram 1-butyl-3-methylimidazolium chloride salt ionic liquids, stir, obtain the suspension that does not stratify; Add the tetramethyl ammonium hydroxide of 10 gram concentration 25%, Stir evenly, seal and place in an ice-water bath at 20°C for alkalization for 30 minutes; add nitrogen gas, heat the water bath to raise the temperature of the water bath to 35°C, add 5 grams of dodecenyl succinic anhydride within 30 minutes, and continue stirring for 4 hours; Add 2.0 grams of acetic acid to adjust the pH of the material to 7, soak and wash with ethanol several times, filter, first recover the ethanol with a rotary evaporator, and then recover the ionic liquid, and vacuum-dry the obtained filter cake at 60°C to obtain hydrophobically modified guar gum .

[0043] It was determined that the degree of substitution of the hydrophobic guar gum was 0.22. The viscosity of the 1% solution was 3200mpa.s.

[0044] Adopt infrared spectrometer to...

Embodiment 2

[0046] 50 gram guar gums are dispersed in 450 gram 1-butyl-3-methylimidazolium chloride salt ionic liquids, stir, obtain the suspension that does not stratify; Add the tetramethylammonium hydroxide of 25 gram concentration 25%, Stir evenly, seal and place in an ice-water bath at 10°C for alkalization for 10 minutes; add nitrogen gas, heat the water bath to raise the temperature of the water bath to 80°C, add 30 grams of octenyl succinic anhydride within 60 minutes, and continue stirring for 4 hours; add Adjust the pH of the material to 6 with 8.0 grams of formic acid, soak and wash with ethanol several times, filter, first recover ethanol with a rotary evaporator, and then recover the ionic liquid, and vacuum-dry the obtained filter cake at 60°C to obtain hydrophobically modified guar gum.

[0047] It was determined that the degree of substitution of the hydrophobic guar gum was 2.15. The viscosity of the 1% solution was 2000mpa.s.

Embodiment 3

[0049] Disperse 50 grams of guar gum in 75 grams of 1-allyl-3-methylimidazolium ionic liquid, stir to obtain a non-layered suspension; add 2.5 grams of tetramethylammonium hydroxide with a concentration of 25%, stir Uniform, sealed and placed in 40°C ice-water bath, alkalized for 10 minutes; nitrogen gas was introduced, the water bath was heated to raise the temperature of the water bath to 65°C, 2.5 g of octadecenyl succinic anhydride was added within 10 minutes, and the stirring reaction was continued for 1 hour; Adjust the pH of the material to 5 with 1.0 g of acetic acid, soak and wash with ethanol several times, filter, first recover the ethanol and then the ionic liquid with a rotary evaporator, and vacuum-dry the obtained filter cake at 60°C to obtain hydrophobically modified guar gum.

[0050] After determination, the degree of substitution of the hydrophobic guar gum is 0.14. The viscosity of 1% solution is 2500mpa.s.

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Abstract

The invention discloses a preparation method and an application of hydrophobic modified guar gum. The method comprises the following steps of: suspending guar gum in an ionic liquid, adding a basic catalyst, and alkalifying at the temperature of 10-40 DEG C; gradually heating under the protection of nitrogen, dropwise adding a modifying agent slowly, and heating to 30-80 DEG C for performing a modification reaction; and after the reaction, adding organic acid for adjusting the pH to 5-7, soaking and washing with ethanol, filtering, and drying a filter cake in vacuum to obtain the hydrophobic modified guar gum. A hydrophobic alkyl long chain is introduced into guar gum hydroxyl, and a terminal group is a carboxylic acid group, so that the water dissolving speed of the guar gum is increased, the macromolecular quality characteristic of the guar gum is protected to the maximum extent, and the guar gum is endowed with hydrophobic performance. Compared with other modified guar gum, the hydrophobic guar gum has the advantages of high molecular weight, high compatibility with cellulose, increase in the molecular bonding force of cellulose-guar gum, improvement on the paper strength and applicability to a paper-making wet part chemical process as a reinforcing agent and a surface sizing agent.

Description

technical field [0001] The invention belongs to the field of polymer material chemistry and relates to the preparation of modified guar gum, in particular to a preparation method and application of hydrophobic modified guar gum. Background technique [0002] The main component of guar gum is polygalactomannan, which is extracted from the endosperm of guar beans in India and Pakistan, and has been adaptively planted in Xinjiang and Hainan. Guar gum is one of the best water-soluble natural polymers known so far, with a molecular weight of 200,000 to 300,000. Since the molecule contains a large number of active hydroxyl groups, the modification of guar gum has always been the focus of research. At present, the modified products mainly involved are cationic guar gum, hydroxypropyl guar gum and carboxymethyl guar gum. These modification reactions all use water or a mixture of hydrophilic solvents as solvents. Dissolved in water, the inner layer molecules are in a swollen state,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00D21H21/16
Inventor 万小芳李友明李楠
Owner SOUTH CHINA UNIV OF TECH
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