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Chitosan microspheres as well as preparation method and application thereof to reduction of dielectric loss of mineral oil

A technology of chitosan microspheres and chitosan, which is applied in its preparation, chitosan microspheres, and the application field of reducing the dielectric loss of mineral oil, can solve the problems of reducing chelation, electric neutralization and adsorption bridging, It is difficult to separate the adsorbent from the oil, reducing the contact area of ​​the oil, etc., to achieve the effect of stable structure, convenient operation and good adsorption performance

Inactive Publication Date: 2018-03-02
HUBEI ENG UNIV
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  • Summary
  • 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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  • Chitosan microspheres as well as preparation method and application thereof to reduction of dielectric loss of mineral oil
  • Chitosan microspheres as well as preparation method and application thereof to reduction of dielectric loss of mineral oil
  • Chitosan microspheres as well as preparation method and application thereof to reduction of dielectric loss of mineral oil

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preparation example Construction

[0033] The present embodiment provides a kind of preparation method of chitosan microsphere, comprises the following steps:

[0034]S1, dissolving chitosan in an acid and spraying it into an aqueous solution of sodium polyphosphate for cross-linking reaction to obtain preliminary cross-linked chitosan microspheres; wherein the acid is preferably acetic acid, and the acetic acid is preferably configured so that the mass concentration is 1%. ~5% aqueous solution is used; the viscosity of chitosan is preferably 0.25 ~ 0.65 Pa s; more preferably, chitosan is dissolved in acid to form a solution with a mass concentration of 0.5 ~ 3%, and then sprayed to a mass fraction of 1 ~ 5% % sodium polyphosphate aqueous solution for cross-linking reaction; further preferably use the nozzle of the electrospinning machine to spray the chitosan solution into the sodium polyphosphate aqueous solution.

[0035] S2. Wash the preliminary crosslinked chitosan microspheres with water, filter and drain...

Embodiment 1

[0042] The present embodiment provides a kind of chitosan microsphere, and its specific preparation method is as follows:

[0043] S101, the preparation mass fraction is the chitosan solution of 0.5%; Dissolving the chitosan solution in the acetic acid solution that the mass fraction is 2% is prepared into the chitosan solution that the mass fraction is 0.5%; Wherein the viscosity of chitosan is 0.48Pa·s;

[0044] S102. Disperse the chitosan solution with a mass fraction of 0.5% in an aqueous solution of sodium polyphosphate with a mass fraction of 1% by using the nozzle system of an electrospinning machine, react at 25° C. for 2 hours to carry out a preliminary cross-linking reaction, and initially The cross-linked chitosan microspheres were washed with distilled water, filtered and drained, added to a sodium hydroxide solution with a mass concentration of 5% and stirred, and 15ml of epichlorohydrin was added as a cross-linking agent, and carried out at 25°C for 2h The secon...

Embodiment 2

[0048] The present embodiment provides a kind of chitosan microsphere, and its specific preparation method is as follows:

[0049] S201, preparing a chitosan solution with a mass fraction of 2%; dissolving chitosan in an acetic acid solution with a mass fraction of 3% to prepare a chitosan solution with a mass fraction of 2%; wherein the viscosity of chitosan is 0.54 Pa s;

[0050] S202. Disperse the chitosan solution with a mass fraction of 2% in an aqueous solution of sodium polyphosphate with a mass fraction of 3% by using the nozzle system of an electrospinning machine, react at 25° C. for 3 hours to carry out a preliminary cross-linking reaction, and initially The cross-linked chitosan microspheres were washed with distilled water, filtered and drained, added to a sodium hydroxide solution with a mass concentration of 7%, stirred, and 10ml of epichlorohydrin was added as a cross-linking agent, and carried out at 25°C for 4h The secondary cross-linking reaction, obtains t...

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Abstract

The invention provides chitosan microspheres as well as a preparation method and application thereof to reduction of dielectric loss of mineral oil and belongs to the field of modified chitosan. The preparation method of the chitosan microspheres comprises the following steps: after dissolving chitosan into acid, spraying the mixture into a sodium polyphosphate water solution and carrying out cross-linking reaction to obtain primarily cross-linked chitosan microspheres; washing the primarily cross-linked chitosan microspheres with water; after filtering and draining, adding the primarily cross-linked chitosan microspheres into a sodium hydroxide solution and stirring; then adding epichlorohydrin and reacting to obtain secondarily cross-linked chitosan microspheres; after washing the secondarily cross-linked chitosan microspheres with water, filtering and draining; then carrying out gradient elution and leaching by utilizing organic solvents with the volume percent of 10 percent to 20 percent, 30 percent to 40 percent, 70 percent to 80 percent and 90 percent to 95 percent; then freezing and drying. According to the preparation method of the chitosan microspheres, provided by the invention, the modified chitosan microspheres with a stable structure and good adsorption performance can be obtained. The invention further provides the application of the chitosan microspheres to the reduction of the dielectric loss of the mineral oil.

Description

technical field [0001] The invention relates to the field of modified chitosan, in particular to a 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: 1. The micro-water in the oil exceeds the standard, which will cause the oil pressure to fail to meet the requirements in severe cases; 2....

Claims

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Application Information

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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彭科张贤覃彩芹
Owner HUBEI ENG UNIV
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