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Production method for corona resistant enamel wire

An enameled wire varnish and production method technology, which is applied in the chemical industry, coating, climate sustainability, etc., can solve the problems of precipitation layering and large dispersion of product performance, and achieve low production cost, good corona resistance, Simple process and reliable results

Inactive Publication Date: 2012-08-08
TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the nanoparticles cannot maintain a stable dispersion state, it is often the case that the product precipitates and stratifies during storage and the performance dispersion of the product is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 19.92kg of isophthalic acid, 7.1kg of ethylene glycol, and 1.1kg of glycerol, put them into a 50-liter reactor with a fractionation dehydration column, fill with carbon dioxide gas, and start stirring under the condition of a pressure of 0.2MPa (gauge pressure) Heat up the temperature to 180°C, then rise to 220°C at a constant speed for about four hours, remove the pressure, make the system under normal pressure, raise the temperature at a rate of 8-12°C per hour, raise the temperature to 240°C, keep warm and take samples to measure the acid value , when the acid value drops to 120mg / g, start to drop the temperature, the temperature drops to 100°C, open the bottom valve of the reactor to obtain polyester with a low degree of polymerization. The appearance of the product is a colorless or yellowish viscous fluid. Its viscosity is about 10 Pas.

[0018] Put the material in the previous step into a high-speed mixer, add 5 kg of nano-silica powder particles treated wi...

Embodiment 2

[0024] Adopt nano-titanium dioxide powder particles, mix with 1wt% titanate coupling agent in a high-speed mixer, after activation treatment, replace the nano-silica powder particles treated with silane in Example 1, other process conditions and implementation Example 1 is the same. The appearance of the prepared product is an opaque white viscous slurry. After standing for half a year, no signs of powder particle aggregation, agglomeration or sedimentation and stratification were found. Samples were taken from various containers storing the product to measure the density. The degree of uneven density of the samples If it is less than 2%, it means that the dispersion state of the powder material is stable; the enameled wire is made by coating copper wire with a general-purpose enameled wire coating machine. Under the conditions of 100ns, 20kHz, 3kV, and 155°C, the frequency conversion resistance life exceeds 50 hours.

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PUM

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Abstract

The invention discloses a production method for a corona resistant enamel wire. The production method comprises the following steps: firstly, synthesizing polyester with low polymerization degree; reducing an acid value of a polycondensation product to 140-70mg / g as a reaction ending point; adding a nanoscale powder particle subjected to surface activating treatment in the polyester with low polymerization degree and reacting until the acid value of the polycondensation product is reduced to 60-15mg / g as a reacting ending point; and cooling and adding solvent to dilute and obtain a finished product. According to the production method for the corona resistant enamel wire, which is disclosed by the invention, the equipment is simple and the operation process is easy to control; the high dispersity of the powder particle in paint liquid can be maintained; and in addition, long-time aggregation and settlement are avoided.

Description

technical field [0001] The invention relates to a production method of corona-resistant enameled wire varnish. Background technique [0002] The frequency conversion speed regulation technology of the motor makes the AC frequency conversion speed regulation motor have outstanding advantages such as energy saving, easy speed regulation, and easy maintenance, etc., and has been widely used in various industries. The pulse wave generated by the speed control device for frequency conversion has a high peak (voltage peak value), and the peak has a steep rising voltage and has an extremely high frequency. Due to the high-frequency and high-voltage dual effects of high-order harmonics, it is easy to produce corona discharge. The high-frequency rectangular wave is applied to the motor winding, causing partial discharge and space charge accumulation inside the winding. In addition, the medium is locally heated. Enameled wire frequency conversion motors are prone to turn-to-turn brea...

Claims

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Application Information

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IPC IPC(8): C09D7/14C09D7/12C09D167/02C08G63/20C09D7/80
CPCY02P20/10
Inventor 谢飞黄宗祥吴春芝
Owner TIANHENGDA ELECTRICAL ENG SCI & TECH CO LTD
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