Hydroxypropyl chitosan microspheres as well as preparation method thereof and application thereof in reduction of dielectric loss of vegetable oil

A technology of hydroxypropyl chitosan and chitosan, which is applied in its preparation, hydroxypropyl chitosan microspheres, and the application field of reducing the dielectric loss of vegetable oil, can solve the problem of agglomerating molecular chains and reduce the contact of oil products. area, reducing chelation, electrical neutralization and adsorption bridging, etc., to achieve the effects of stable and reliable structure, large specific surface area and simple process

Active Publication Date: 2018-03-20
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the prior art documents cited above show obvious deficiencies in the application of chitosan adsorbents in transformer oil regeneration. This technical document utilizes chitosan and oil products for stirring and blending, resulting in flocculent chitosan being dispersed in Among lubricating oils with high viscosity, although the purpose of reducing the acid value through flocculation can be achieved, it is difficult to separate the suspended adsorbent from the oil, which is not conducive to practical production and application. In addition, the hydrogen bond of chitosan itself The force will reunite the molecular chains, reduce the actual contact area with the oil, and reduce its chelation, electrical neutralization and adsorption bridging effects

Method used

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  • Hydroxypropyl chitosan microspheres as well as preparation method thereof and application thereof in reduction of dielectric loss of vegetable oil
  • Hydroxypropyl chitosan microspheres as well as preparation method thereof and application thereof in reduction of dielectric loss of vegetable oil
  • Hydroxypropyl chitosan microspheres as well as preparation method thereof and application thereof in reduction of dielectric loss of vegetable oil

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preparation example Construction

[0034] The present embodiment provides a kind of preparation method of hydroxypropyl chitosan microsphere, comprises the following steps:

[0035] S1. Put chitosan and isopropanol with a viscosity of 0.25 to 0.65 Pa·s into the first sodium hydroxide solution, mix and stir evenly to obtain a solution, add tetramethylammonium hydroxide to the solution, and then drop propylene oxide Reaction to obtain a reaction solution, after cooling the reaction solution, use hydrochloric acid to adjust the pH to 7, then disperse in acetone or water, stir and filter with suction, then wash with absolute ethanol, and vacuum dry to obtain hydroxypropyl chitosan; preferably, the first hydrogen The mass concentration of sodium oxide solution is 10-20%, the mass ratio of chitosan, isopropanol and propylene oxide is 1-2:10-25:10-20, chitosan and isopropanol are put into the first hydrogen The sodium oxide solution is mixed and stirred at 25-35° C. for 0.5-1.5 hours; preferably, propylene oxide is dr...

Embodiment 1

[0045] The present embodiment provides a kind of hydroxypropyl chitosan microsphere, and its specific preparation method is as follows:

[0046] S101, preparing a hydroxypropyl chitosan solution with a mass fraction of 0.5%; putting chitosan and isopropanol in a mass ratio of 1:15 into the first sodium hydroxide solution with a mass concentration of 10% at 30°C Mix and stir for 1 hour to obtain a solution, add tetramethylammonium hydroxide to the solution, drop propylene oxide and stir at 60°C for 5 hours to obtain a reaction solution. The mass ratio of chitosan and propylene oxide is 1:10. After the reaction solution is cooled, use hydrochloric acid to adjust the pH to 7, then disperse in acetone or water, stir and filter, then wash with absolute ethanol, and vacuum dry to obtain hydroxypropyl chitosan; dissolve hydroxypropyl chitosan in water to prepare The mass fraction is 0.5% hydroxypropyl chitosan solution; wherein the viscosity of chitosan is 0.48Pa·s;

[0047] S102, t...

Embodiment 2

[0051] The present embodiment provides a kind of hydroxypropyl chitosan microsphere, and its specific preparation method is as follows:

[0052] S201, preparing a hydroxypropyl chitosan solution with a mass fraction of 2%; putting chitosan and isopropanol in a mass ratio of 1:20 into the first sodium hydroxide solution with a mass concentration of 15% at 25°C Mix and stir for 1 hour to obtain a solution, add tetramethylammonium hydroxide to the solution, drop propylene oxide, stir and react at 55°C for 5 hours to obtain a reaction solution, the mass ratio of chitosan and propylene oxide is 1:15, and After the reaction solution is cooled, use hydrochloric acid to adjust the pH to 7, then disperse in acetone or water, stir and filter, then wash with absolute ethanol, and vacuum dry to obtain hydroxypropyl chitosan; dissolve hydroxypropyl chitosan in water to prepare The mass fraction is 2% hydroxypropyl chitosan solution; wherein the viscosity of chitosan is 0.54Pa·s;

[0053] ...

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Abstract

The invention provides hydroxypropyl chitosan microspheres as well as a preparation method thereof and application thereof in reduction of dielectric loss of vegetable oil, belonging to the field of chitosan modification. The preparation method of the hydroxypropyl chitosan microspheres comprises the following steps: mixing chitosan, having viscosity of 0.25-0.65Pa.s with isopropanol and a first sodium hydroxide solution, adding tetramethyl ammonium hydroxide into the mixture, dropwise adding epoxypropane for carrying out a reaction, cooling and adjusting the pH value to 7, dispersing the product into acetone or water, stirring and carrying out suction filtration, washing with anhydrous ethanol, and carrying out vacuum drying to obtain hydroxypropyl chitosan; preparing the hydroxypropyl chitosan into a solution, spraying the solution onto sodium polyphosphate, carrying out ultrasonic treatment and crosslinking, then washing with water, filtering, adding the product into a sodium hydroxide solution and stirring, and adding glutaraldehyde for carrying out a reaction so as to obtain microspheres; washing the microspheres with water, then leaching the microspheres respectively with organic solvents with volume percentages of 21-29%, 41-49%, 61-69% and 85-89%, and carrying out freeze drying. The modified chitosan prepared by the method can reduce the dielectric loss of the vegetableoil.

Description

technical field [0001] The invention relates to the field of chitosan modification, in particular to a hydroxypropyl chitosan microsphere, its preparation method and its application in reducing the dielectric loss of vegetable oil. Background technique [0002] Transformer oil refers to the insulating oil of natural hydrocarbon mixture obtained from petroleum refining. As the main insulation and cooling medium of oil-filled high-voltage electrical appliances, transformer oil is widely used in transformers and circuit breakers. The simplified inspection of transformer oil includes the following items: oil appearance, flash point, pressure resistance, water-soluble acid (pH value), acid value, micro-water, chromatography, gas content in oil, dielectric loss factor, etc., among which the transformer oil is not The main reasons for the qualification are: 1. The micro-water in the oil exceeds the standard, which will cause the oil pressure to fail to meet the requirements in seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08J3/24C08B37/08
CPCC08B37/003C08J3/12C08J3/24C08J2305/08
Inventor 李伟郑科旺黄超凡罗彪陈阳王振宇郭海张贤覃彩芹
Owner HUBEI ENG UNIV
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