Impregnating insulating paint for medium-high-voltage motor, and preparation method thereof
A technology of impregnating insulation and insulating paint, applied in the field of insulating paint, can solve the problems of large curing shrinkage, high viscosity, poor stability, etc., and achieve the effects of excellent electrical insulation performance, environmental protection requirements, and high mechanical strength.
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Embodiment 1
[0040] A: Preparation of unsaturated polyester modified epoxy resin solution:
[0041] In parts by weight, take 100 parts of maleic anhydride, 25 parts of ethylene glycol, and 100 parts of diethylene glycol monomethyl ether into the first reaction kettle, start stirring, and heat up to 150°C for esterification reaction; measure the reactant The acid value until the acid value is 80mgKOH / g, the temperature is lowered to room temperature, and the unsaturated polyester containing a large amount of carboxyl groups is obtained, which is taken out from the first reaction kettle for subsequent use. Take 100 parts of the above-mentioned unsaturated polyester containing a large number of carboxyl groups, 150 parts of E44 bisphenol A epoxy resin, and 0.02 parts of triethylamine catalyst and put them into the second reaction kettle, start stirring, raise the temperature to 80°C, and measure the acid value of the reactant , until the acid value is lower than 30mgKOH / g, lower the temperature...
Embodiment 2
[0045] A: Preparation of unsaturated polyester modified epoxy resin solution:
[0046] In parts by weight, take 100 parts of fumaric acid, 10 parts of diethylene glycol, and 100 parts of allyl alcohol and add them to the first reaction kettle, start stirring, and heat up to 170°C for esterification reaction; measure the acid value of the reactants , until the acid value is 100mgKOH / g, the temperature is lowered to room temperature, and an unsaturated polyester containing a large amount of carboxyl groups is obtained, which is loaded from the first reaction kettle and set aside. Take 100 parts of the above-mentioned unsaturated polyester containing a large number of carboxyl groups, 200 parts of bisphenol F epoxy resin (6458, epoxy value 0.55-0.62), and 0.02 parts of triethylamine catalyst into the second reaction kettle, start stirring, and heat up to 100°C, measure the acid value of the reactant until the acid value is lower than 30mgKOH / g, lower the temperature below 80°C, a...
Embodiment 3
[0050] A: Preparation of unsaturated polyester modified epoxy resin solution:
[0051] In parts by weight, take 100 parts of tetrahydrophthalic anhydride, 25 parts of butylene glycol, and 50 parts of prenyl alcohol into the first reaction kettle, start stirring, and raise the temperature to 200°C for esterification reaction; measure the acid value of the reactant , until the acid value is 180mgKOH / g, the temperature is lowered to room temperature, and an unsaturated polyester containing a large amount of carboxyl groups is obtained, which is loaded from the first reaction kettle and set aside. Take 100 parts of the above-mentioned unsaturated polyester containing a large number of carboxyl groups, 50 parts of F51 novolac epoxy resin, and 0.02 parts of triethylamine catalyst and add them to the second reaction kettle, start stirring, heat up to 120 ° C, and measure the acid value of the reactant until The acid value is lower than 30mgKOH / g, lower the temperature below 80°C, add...
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