US 12,168,722 B2
Method of producing resin and method of producing insulating structure
Kodai Ushiwata, Tokyo (JP); Yu Yamashita, Tokyo (JP); Tetsuo Yoshimitsu, Tokyo (JP); Takahiro Imai, Kanagawa (JP); and Hiromitsu Hirai, Kanagawa (JP)
Assigned to TMEIC CORPORATION, Tokyo (JP)
Appl. No. 17/634,996
Filed by Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo (JP)
PCT Filed Dec. 22, 2020, PCT No. PCT/JP2020/048025
§ 371(c)(1), (2) Date Feb. 14, 2022,
PCT Pub. No. WO2022/044358, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-146267 (JP), filed on Aug. 31, 2020.
Prior Publication US 2022/0356311 A1, Nov. 10, 2022
Int. Cl. C08J 3/20 (2006.01); C08G 59/34 (2006.01); C08G 59/42 (2006.01); H01B 13/00 (2006.01); H01B 17/56 (2006.01); H02K 3/32 (2006.01)
CPC C08J 3/20 (2013.01) [C08G 59/34 (2013.01); C08G 59/42 (2013.01); H01B 13/0036 (2013.01); H01B 17/56 (2013.01); H02K 3/32 (2013.01); C08J 2363/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of producing an insulating structure formed on an outer peripheral portion of a conductor, the method comprising:
a resin production step of producing a resin including a nanofiller; and
a step of impregnating a non-conductive tape-shaped member wound around the outer peripheral portion of the conductor with the resin, wherein
the resin production step includes:
a filler mixing step of mixing the nanofiller at a ratio of 15 wt % or more with an epoxy resin to form a mixture;
a shear mixing step of mixing the mixture to disperse the nanofiller in the mixture by shear mixing;
a diluent mixing step of mixing a reactive diluent that reduces a viscosity of the epoxy resin, with the mixture after the shear mixing step, and
a curing agent mixing step of mixing an acid anhydride curing agent with the mixture after the diluent mixing step,
wherein the resin production step further comprising a dispersiveness evaluation step of evaluating dispersiveness of the nanofiller in the mixture after the diluent mixing step, and
wherein the curing agent mixing step is performed when dispersiveness of the nanofiller is evaluated to satisfy a predetermined criterion in the dispersiveness evaluation step.