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

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....

Images