Electrical insulating resin composition for partial-discharge resistance
A resin composition, partial discharge technology, applied in the direction of conductor/cable insulation, insulator, insulated conductor, etc., can solve the problems of insulator damage, inability to maintain insulation, damage, etc., and achieve the effect of excellent partial discharge resistance
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[0142] The following examples are given to describe the present invention more specifically, but the present invention is not limited to these examples.
[0143]
[0144] (Preparation of layered composite hydroxide pregel)
[0145] 3.0 g of a hydrotalcite compound (manufactured by Kyowa Chemical Industry Co., Ltd., "DHT-4A-2", average particle diameter 440 nm, aspect ratio 10) as a layered composite hydroxide, N-methyl-2-pyrrolidone (NMP ) 4.5 g and 6.0 g of water were placed in a plastic airtight container, and the mixing mode (2000 rpm) was run for 3 minutes using an autorotation-revolving mixer (manufactured by THINKY Corporation, "ARE-310"), and stirred to obtain a hydrotalcite compound relative to The ratio of the whole pregel was 22.2% by mass of pregel.
[0146] (Production of polyamic acid varnish)
[0147] 73.2 g of 4,4'-diaminodiphenyl ether and 832 g of NMP were put into a 1 L four-necked flask equipped with a stirrer and a thermometer, and the temperature was r...
Embodiment 2
[0156] (Production of Lactate Ion Replaced Layered Composite Hydroxide)
[0157] Into a 3L four-neck flask equipped with a stirrer, 50 g of a hydrotalcite-based compound (manufactured by Kyowa Chemical Industry Co., Ltd., "DHT-6", average particle diameter 0.5 μm, aspect ratio 4.5) and 950 g of methanol were charged as a layered composite hydroxide, After stirring under nitrogen, 13.5 g of lactic acid was added after 20 minutes, and the mixture was stirred at 45° C. for 2 hours to replace the interlayer ions of hydrotalcite with lactate ions. Thereafter, filtration was performed with a membrane filter having a pore size of 0.2 μm under a nitrogen stream, and the precipitate was sufficiently washed with methanol. The filtered precipitate was dried under vacuum to obtain 52 g of white powder of lactate ion-based hydrotalcite.
[0158] (Preparation of layered composite hydroxide pregel)
[0159] 89 g of water was added to 11 g of the white powder of lactate ion-based hydrotalci...
Embodiment 3
[0167] (Production of insulating varnish)
[0168] 8.6 g of the pregel (5.5% by mass) of lactate ion-based hydrotalcite produced by the same method as that of the layered composite hydroxide pregel of Example 2 was prepared by the same method as in Example 2. Put 50.0 g of the prepared polyamic acid varnish (9.0 g of aromatic polyamic acid, 41.0 g of NMP) into a plastic airtight container, and run the mixing mode for 5 minutes using a rotation and revolution mixer (manufactured by THINKY Corporation, "ARE-310") (2000rpm), 5-minute defoaming mode (2200rpm), stirring was performed to obtain an insulating varnish containing an electrical insulating resin composition for resistance to partial discharge. In the obtained insulating varnish, the ratio of nonvolatile components to the entire dispersion liquid was 16.2% by mass, and the ratio of lactate ion-based hydrotalcite to the entire nonvolatile components was 5.0% by mass.
[0169] (production of insulating film)
[0170] The ...
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