Hydroxypropyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil

A technology of hydroxypropyl chitosan and chitosan, used in the application of reducing the dielectric loss of mineral oil, its preparation, the field of hydroxypropyl chitosan microspheres, can solve the problem of reducing chelation, electric neutralization and adsorption The problems of bridging, difficult separation of adsorbent and oil, and reduction of oil contact area, etc., achieve the effects of convenient operation, no pollution hazards, and stable and reliable structure

Inactive Publication Date: 2018-04-06
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil
  • Hydroxypropyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil
  • Hydroxypropyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral 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 into the first sodium hydroxide solution, mix and stir evenly to obtain a solution, add tetramethylammonium hydroxide to the solution, drop in propylene oxide to react to obtain a reaction solution, and cool the reaction solution Finally, use hydrochloric acid to adjust the pH to 7, then disperse in acetone or water, stir, and suction filter, then wash with absolute ethanol, and vacuum-dry to obtain hydroxypropyl chitosan; wherein, the viscosity of chitosan is preferably 0.25 ~ 0.65Pa·s Preferably, the mass concentration of the first sodium hydroxide solution is 10~20%, the mass ratio of chitosan, isopropanol and propylene oxide is 1~2: 10~25:10~20, chitosan and isopropanol Put propanol into the first sodium hydroxide solution and mix and stir at 25-35°C for 0.5-1.5h; preferably drop propylene oxide ...

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. D...

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 a hydroxypropyl chitosan microsphere, and a preparation method and application thereof in reducing the dielectric loss of mineral oil, and belongs to the field of chitosan modification. The preparation method comprises the following steps: mixing chitosan, isopropanol, and a first sodium hydroxide solution; adding tetramethyl ammonium hydroxide, dropwise adding epoxy propaneto carry out reactions; cooling, adjusting the pH to 7 by using hydrochloric acid; dispersing the reaction product in acetone or water, stirring, carrying out suction filtration, washing the reactionproduct by anhydrous ethanol, drying the reaction product in vacuum to obtain hydroxypropyl chitosan; preparing a hydroxypropyl chitosan solution, spraying the solution on sodium polyphosphate to carry out cross-linking reactions, washing the reaction product by water, filtering, adding the reaction product into a sodium hydroxide solution, stirring, adding epoxy chloropropane to carry out reactions to obtain microspheres; washing the microspheres by water, then drip-washing the microspheres by organic solvents with volume percentages of 10-20%, 30-40%, 70-80%, and 90-95% in sequence, and finally performing freeze-drying. The prepared modified chitosan can reduce the dielectric loss of mineral oil.

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 mineral oil. Background technique [0002] Transformer oil refers to the mineral 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 as follows: 1. The micro-water in the oil exceeds the standard, which will cause the oil pressure to fail to meet the req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C10G25/00
CPCB01J20/24B01J20/28021B01J2220/4825C10G25/003
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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