Flame-retardant degradable liquid insulating medium and application thereof

Abstract

The invention discloses a flame-retardant biodegradable liquid insulating medium. The flame-retardant biodegradable liquid insulating medium contains 90 mass% or more of glyceride, and the glyceride contains 10 mass% or less of C8-C14 fatty glyceride and 90 mass% or more of C1-C22 fatty glyceride. Raw materials of the insulating medium are mainly derived from vegetable oil, the biodegradation rate is up to 98% or above after 40 days, the flash point is higher than 300 DEG C, the breakdown voltage is higher than 60 kV, the pour point is lower than -20 DEG C, and the kinematic viscosity is less than 25 mm<2> / s. The provided liquid insulating medium has the advantages of being high in flash point, excellent in insulating property and environmentally friendly, can be widely applied in insulation of power equipment, such as the insulation and cooling of transformers, cables, switches and capacitors.

Description

technical field [0001] The invention belongs to the technical field of insulating materials, and more specifically relates to a flame-retardant and degradable liquid insulating medium and its application. Background technique [0002] As a liquid insulating medium used for the purpose of insulation and cooling of transformers, cables, switches, and capacitors, etc., mineral oil insulating oils are usually used at present, as well as synthetic materials such as biphenyl, siloxane, and phthalates. Compound insulating oil. [0003] However, mineral oil insulating oil has high flammability, which not only has problems in safety, but also causes energy and environmental problems due to its non-renewability and non-degradability. On the other hand, synthetic compound insulating oils also have problems such as high flammability and high price. In particular, phthalates are suspected of having endocrine disrupting effects. Polychlorinated biphenyls (PCBs) are also banned due to se...

AI Technical Summary

Problems solved by technology

[0003] However, mineral oil insulating oil has high flammability, which not only has problems in safety, but also causes energy problems and environmental problems due to its non-renewability and non-degradability.

On the other hand, synthetic compound insulating oil also has problems such as high flammability and high price, especially phthalates have been pointed out to have the effect of disrupting endocrine

Polychlorinated biphenyls (PCBs) are also banned due to serious problems in safety, toxicity, and environmental pollution.

Although the ignition point of non-fuel and refractory fuel is higher than 300°C, and the electrical properties are good, the cost is too high and it is not easy to degrade, which greatly limits its application.

Although general vegetable oil is environmentally friendly and non-toxic and has a high flash point, it has a high pour point (generally above -10°C) and high viscosity (40°C, 40mm 2 / s or so), poor fluidity, which is not conducive to convection cooling and low temperature environment operation

Based on the composition of vegetable insulating oil itself, if the pour point is to be lowered, the flash point will be seriously affected; and if the kinematic viscosity is to be improved, the flash point will also be negatively affected

[0004] The Chinese invention patent application with the publication number CN101230304A discloses a kind of environment-friendly transformer oil, the main component is the product of vegetable oil and lower alcohol esterification, which improves the viscosity and freezing point (pour point), but the transformer oil prepared by this method The flash point is only 215°C, so it is not suitable for places requiring high fire resistance, and the addition of pour point depressants will inevitably affect the electrical properties of insulating oil

The Chinese invention patent application with publication number CN101619254A discloses a hybrid insulating oil, which is obtained by mixing 15-25% vegetable oil with 75-85% mineral insulating oil and adding 0.2-0.5% antioxidant, but the insulating oil The flash point is around 145°C, which limits its application in places with high fire performance

Publication No. CN101538505B Chinese invention patent publication discloses a kind of environmental protection insulating oil with vegetable oil as raw material, which has a high flash point, but it is found through experiments that its pour point is high and its kinematic viscosity is poor

At present, there is no environmentally friendly insulating oil with high flash point, low freezing point and good fluidity

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