N-trimethyl chitosan microsphere, preparation method thereof and application of microsphere in reduction of dielectric loss of vegetable oil

A technology of trimethyl chitosan microspheres and trimethyl chitosan, which is applied in its preparation and application in reducing the dielectric loss of vegetable oil, in the field of N-trimethyl chitosan microspheres, can solve the problem of reducing chelation , electric neutralization and adsorption bridging, difficult separation of adsorbent and oil, reducing oil contact area, etc., to achieve the effect of reducing the dielectric loss of vegetable oil, easy operation, stable and reliable structure

Active Publication Date: 2018-03-09
HUBEI ENG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • N-trimethyl chitosan microsphere, preparation method thereof and application of microsphere in reduction of dielectric loss of vegetable oil
  • N-trimethyl chitosan microsphere, preparation method thereof and application of microsphere in reduction of dielectric loss of vegetable oil
  • N-trimethyl chitosan microsphere, preparation method thereof and application of microsphere in reduction of dielectric loss of vegetable oil

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preparation example Construction

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

[0034] S1. Mix chitosan, sodium iodide and N-methyl-2-pyrrolidone with a viscosity of 0.25 to 0.65 Pa·s and react in the dark to obtain a reaction solution, and add the first sodium hydroxide solution and iodine to the reaction solution Methane is reacted in the dark to obtain a solution, and then the solution is precipitated with ethanol, separated, and dried to obtain N-trimethyl chitosan; wherein the degree of quaternization substitution of N-trimethyl chitosan is 10 to 20%; preferably Yes, chitosan, sodium iodide and N-methyl-2-pyrrolidone are mixed at a mass ratio of 1-2:3-4:30-40 and reacted at 50-70°C for 0.5-2 hours in the dark to obtain a reaction solution . Further preferably, adding the first sodium hydroxide solution and methyl iodide to the reaction solution with a mass fraction of 5 to 20% and reacting for 1 to 2 hours to obta...

Embodiment 1

[0044] The present embodiment provides a kind of N-trimethyl chitosan microsphere, and its specific preparation method is as follows:

[0045] S101, prepare N-trimethyl chitosan solution with a mass fraction of 0.5% (quaternization degree of substitution 14.6%); mix chitosan, sodium iodide and N-methyl-2-pyrrolidone at 2:4: Mix at a mass ratio of 40 and react in the dark at 60°C for 1 h to obtain a reaction solution, add 20 ml of the first sodium hydroxide solution with a mass fraction of 10% and 20 ml of methyl iodide to react for 1 to 2 hours to obtain a solution, and then add the solution Precipitate, separate and dry with ethanol to obtain N-trimethyl chitosan, and dissolve N-trimethyl chitosan in water to prepare a N-trimethyl chitosan solution with a mass fraction of 0.5%; wherein the shell The viscosity of polysaccharide is 0.48Pa·s;

[0046] S102, the N-trimethyl chitosan solution that mass fraction is 0.5% utilizes the nozzle system of compressed air machine to use t...

Embodiment 2

[0050] The present embodiment provides a kind of N-trimethyl chitosan microsphere, and its specific preparation method is as follows:

[0051] S201, prepare N-trimethyl chitosan solution with a mass fraction of 2% (quaternization degree of substitution 14.6%); mix chitosan, sodium iodide and N-methyl-2-pyrrolidone at 2:4: Mix at a mass ratio of 40 and react in the dark at 60°C for 1 h to obtain a reaction solution, add 20 ml of the first sodium hydroxide solution with a mass fraction of 10% and 20 ml of methyl iodide to react for 1 to 2 hours to obtain a solution, and then add the solution Precipitate, separate and dry with ethanol to obtain N-trimethyl chitosan, and dissolve N-trimethyl chitosan in water to prepare a N-trimethyl chitosan solution with a mass fraction of 2%; wherein the shell The viscosity of polysaccharide is 0.54Pa·s;

[0052] S202, the mass fraction is that 2% N-trimethyl chitosan aqueous solution utilizes the nozzle system of compressed air machine to use...

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Abstract

The invention provides an N-trimethyl chitosan microsphere, a preparation method thereof and application of the microsphere in reduction of dielectric loss of vegetable oil, belonging to the field ofmodified chitosan. The preparation method of the N-trimethyl chitosan microsphere comprises the following steps: carrying out hybrid reaction on chitosan with the visocisty of 0.25-0.65Pa.s, sodium iodide and N-methyl-2-pyrrolidone, then adding sodium hydroxide and methyl iodide, reacting, then carrying out ethanol precipitation, separating, and carrying out freeze drying, thereby obtaining N-trimethyl chitosan with the quaternization substitution degree of 10-20%; preparing N-trimethyl chitosan into solution, spraying into sodium polyphosphate, reacting, washing with water, adding into sodiumhydroxide solution, stirring, adding glutaraldehyde, and reacting, thereby obtaining the microsphere; and washing the microsphere with water, then sequentially eluting with organic solvents with thevolume fractions of 21-29%, 41-49%, 61-69% and 85-89%, and carrying out freeze drying. The modified chitosan prepared by adopting the method can reduce the dielectric loss of the vegetable oil.

Description

technical field [0001] The invention relates to the field of modified chitosan, in particular to a kind of N-trimethyl 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 se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08B01J13/14B01J13/20B01J20/24C11B3/10
CPCB01J13/14B01J13/206B01J20/24C08B37/003C11B3/10
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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