A kind of preparation method and application of oil-absorbing hydrogel

A hydrogel and oil-based technology, applied in gel preparation, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low adsorption efficiency and weak adsorption effect, and achieve easy operation, good adsorption capacity, Simple preparation method

Active Publication Date: 2022-06-17
BEIJING UNION UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption of chitosan to neutral substances is very weak, because the stereoregularity of chitosan molecules and the hydrogen bonds between molecules and molecules in their structures are difficult to dissolve in neutral and alkaline media, and have a great impact on molecular weight. Relatively large organic substances have low adsorption efficiency, such as grease

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  • A kind of preparation method and application of oil-absorbing hydrogel
  • A kind of preparation method and application of oil-absorbing hydrogel
  • A kind of preparation method and application of oil-absorbing hydrogel

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preparation example Construction

[0025] The preparation method of the oil-absorbing hydrogel of the present invention comprises the following steps:

[0026] (1) chitosan is dissolved in the acetic acid solution whose concentration is 2wt%;

[0027] (2) polyvinyl alcohol is completely dissolved in water;

[0028] (3) mixing the two solutions according to the mass ratio of chitosan and polyvinyl alcohol in a ratio of 1:1 to 1:10, and stirring to make them evenly mixed;

[0029] (4) According to the mass ratio of chitosan and crosslinking agent, genipin was added in a ratio of 1:0.03 to 1:0.50, and at room temperature, stirring was continued, and a transparent hydrogel appeared after 8 hours, and continued Stir until stirring is difficult, stop the reaction, and obtain a hydrogel.

[0030] (5) In order to determine the characteristic parameters of the copolymer hydrogel, the required treatment process is as follows: filter out the liquid, first wash with acetic acid solution with a concentration of 2wt%, then...

Embodiment 1

[0043]1 g of chitosan with a degree of deacetylation of 90% and a molecular weight of 800,000 was dissolved in 100 mL of an acetic acid solution with a concentration of 2 wt%. Add 2 g of polyvinyl alcohol to the water, stir to make it fully dissolved, and the viscosity value of the polyvinyl alcohol used is 6.3. Mix the two solutions evenly, then add genipin into the mixture to make the concentration of genipin 0.5wt%, stir the reaction at room temperature, and a transparent gel will appear after 8 hours, until the gel More and more, stirring is difficult, and the reaction stops.

[0044] The liquid was filtered off, first washed with acetic acid solution with a concentration of 2wt%, then washed with deionized water until neutral, removed unreacted chitosan, polyvinyl alcohol, and cross-linking agent, took out the hydrogel, filtered off Moisture, vacuum-dried at 80° C. to constant weight to obtain a dry gel, the cross-linking rate was 96%, the cross-linking efficiency was 35...

Embodiment 2

[0046] 1 g of chitosan with a degree of deacetylation of 95% and a molecular weight of 400,000 was dissolved in 100 mL of an acetic acid solution with a concentration of 2 wt%. Add 3 g of polyvinyl alcohol to the water, stir to make it fully dissolved, and the viscosity value of the polyvinyl alcohol used is 6.3. Mix the two solutions evenly, then add genipin into the mixture to make the concentration of genipin 1 wt%, stir the reaction at room temperature, and a transparent gel will appear after 8 hours, until the gel becomes more and more The more, the more difficult it is to stir, and the reaction stops.

[0047] The liquid was filtered off, first washed with acetic acid solution with a concentration of 2wt%, then washed with deionized water until neutral, removed unreacted chitosan, polyvinyl alcohol, and cross-linking agent, took out the hydrogel, filtered off Moisture, vacuum-dried at 80° C. to constant weight to obtain a dry gel, the cross-linking rate was 112%, the cr...

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Abstract

The invention provides a preparation method and application of oil-absorbing hydrogel. The preparation method comprises the following steps: (1) dissolving chitosan in an acetic acid solution with a concentration of 2 wt %; (2) completely dissolving polyvinyl alcohol in water; (3) dissolving the polyvinyl alcohol according to the quality of chitosan and polyvinyl alcohol Mix the two solutions at a ratio of 1:1 to 1:10, stir to make them evenly mixed; (4) add chitosan to the crosslinking agent at a ratio of 1:0.05 to 1:0.30 Genipin, at room temperature, kept stirring, and a transparent hydrogel appeared after 8 hours, continued to stir until the stirring was difficult, stopped the reaction, and filtered off the liquid to obtain a hydrogel. The oil-absorbing hydrogel has a good adsorption capacity for oil, can transform the liquid kitchen waste into a semi-solid gel state, prevents the spread of the liquid kitchen waste, and avoids pollution to the environment. The present invention has distinct green features in terms of the safety of raw materials, the energy-saving performance of the technological process, and the environmental friendliness of the reaction product.

Description

technical field [0001] The invention relates to a preparation method and application of an oil-absorbing hydrogel, and belongs to the technical and application fields of biological functional materials. Background technique [0002] With the change of lifestyle, the pollution of domestic sewage to the environment is becoming more and more serious. According to statistics, the amount of domestic sewage discharged per person per day in the city is 150-400L, mainly various detergents and sewage used in life, containing a large amount of organic matter. In particular, the kitchen fluid residue contains a large amount of oil, protein, cellulose, sugar, etc., which are the nutrients of microorganisms and provide conditions for the proliferation of pathogenic bacteria in the environment. Under the action of anaerobic bacteria, malodorous substances are easily produced, so the effective treatment of kitchen fluid residues is a necessary basis for maintaining a clean and healthy env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L29/04C08L5/08C08K5/1545B01J13/00C02F1/56C02F1/28C02F101/34
CPCC08J3/075C08K5/1545B01J13/0065C02F1/56C02F1/286C02F1/285C02F2101/34C08J2329/04C08J2405/08C08J2305/08C08J2429/04
Inventor 李若慧郭晓桐黄迎春方国康张元蒋丹
Owner BEIJING UNION UNIVERSITY
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