A kind of water-based insulating varnish for electronic transformer and its preparation method and application

[0029] This embodiment provides a water-based insulating varnish for electronic transformers, the raw materials of which include glycerol 100g, neopentyl glycol 40g, phthalic anhydride 265g, trimellitic anhydride 50g, 1,6-hexamethylene diisocyanate 35g, 2,2 - 28 g of dimethylol propionic acid, 15 g of triethanolamine, 40 g of propylene glycol methyl ether, 55 g of melamine formaldehyde resin, and 200 g of water.

[0030] The preparation method is as follows: in a three-necked flask, add glycerol, neopentyl glycol, phthalic anhydride, trimellitic anhydride, control the temperature at 180-200°C, and undergo polycondensation until the acid value is less than or equal to 20mgKOH / g to obtain terminal Hydroxyl hyperbranched polyester, cool down to 80°C, add 1,6-hexamethylene diisocyanate dropwise, keep warm for 2 hours, add 2,2-dimethylol propionic acid, triethanolamine, propylene glycol methyl ether and water, keep warm for 2 hours, Lower the temperature to 50°C, add a water-based ...

[0032] This embodiment provides a water-based insulating varnish for electronic transformers, the raw materials of which include glycerol 105g, neopentyl glycol 40g, phthalic anhydride 296g, trimellitic anhydride 55g, 1,6-hexamethylene diisocyanate 35g, 2,2 - 30 g of dimethylol propionic acid, 15 g of triethanolamine, 40 g of propylene glycol methyl ether, 60 g of melamine formaldehyde resin, and 230 g of water.

[0033] Its preparation method is the same as Example 1.

[0035] This embodiment provides a water-based insulating varnish for electronic transformers, the raw materials of which include 100 g of glycerol, 45 g of neopentyl glycol, 265 g of phthalic anhydride, 50 g of trimellitic anhydride, 52 g of diphenylmethane diisocyanate, 2,2- Dimethylol propionic acid 28g, triethanolamine 20g, propylene glycol methyl ether 50g, melamine formaldehyde resin 55g, water 210g.

[0036] Its preparation method is the same as Example 1.