An environment-friendly vacuum pressure impregnation resin with high bond strength
A vacuum pressure impregnation and environmental protection technology, applied in the field of impregnating insulating varnish, can solve the problems of increasing the content of volatile organic compounds in the resin, reducing the performance of the impregnating resin, and restricting the application, so as to enhance the normal and thermal mechanical properties, reduce the content, The effect of reducing dosage
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Embodiment 1
[0046] (1) First, referring to the literature "Research on the Preparation and Modification of Unsaturated Polyester Imine", using trimellitic anhydride and 4,4'-diaminodiphenylmethane as raw materials to synthesize imine dibasic acid, the structural formula is as follows: Formula (I) Show. Then according to a certain weight, the isophthalic acid, maleic anhydride, 1,2-propanediol and neopentyl glycol with a molar ratio of 1:1:1:1 were weighed and fed respectively, and then polybasic acid was added and the imine dibasic acid of 3% of the total amount of polyols, the reaction temperature is 180-200 DEG C, and the water flows out separately. When the acid value is between 30 and 40 mg KOH / g, stop the reaction and add 0.01% hydroquinone. Cool to room temperature to obtain imine modified unsaturated polyester;
[0047]
[0048] (2) After mixing imine-modified unsaturated polyester with E-44 bisphenol A epoxy resin in a weight ratio of 1:0.5, react at 100-140°C until the acid ...
Embodiment 2
[0058] (1) First, refer to the literature "Preparation and Modification of Unsaturated Polyester Imine", and use trimellitic anhydride and 1,6-hexanediamine as raw materials to synthesize imine dibasic acid. The structural formula is shown in the following formula (II). Then according to a certain weight, the isophthalic acid, maleic anhydride, 1,2-propanediol and neopentyl glycol with a molar ratio of 1:1:1:1 were weighed and fed respectively, and then polybasic acid was added and the imine dibasic acid of 3% of the total amount of polyols, the reaction temperature is 180-200 DEG C, and the water flows out separately. When the acid value is between 30 and 40 mgKOH / g, stop the reaction and add 0.01% hydroquinone. Cool to room temperature to obtain imine modified unsaturated polyester;
[0059]
[0060] (2) After mixing imine-modified unsaturated polyester with E-44 bisphenol A epoxy resin in a weight ratio of 1:0.5, react at 100-140°C until the acid value is 10-20mg KOH / g ...
Embodiment 3
[0064] (1) First, referring to the literature "Research on the Preparation and Modification of Unsaturated Polyester Imine", using trimellitic anhydride and 4,4'-diaminodiphenyl ether as raw materials to synthesize imine dibasic acid, the structural formula is as shown in formula (Ⅲ) Show. Then according to a certain weight, the isophthalic acid, maleic anhydride, 1,2-propanediol and neopentyl glycol with a molar ratio of 1:1:1:1 were weighed and fed respectively, and then polybasic acid was added and the imine dibasic acid of 3% of the total amount of polyols, the reaction temperature is 180-200 DEG C, and the water flows out separately. When the acid value is between 30 and 40 mg KOH / g, stop the reaction and add 0.01% hydroquinone. Cool to room temperature to obtain imine modified unsaturated polyester;
[0065]
[0066] (2) After mixing imine-modified unsaturated polyester with E-44 bisphenol A epoxy resin in a weight ratio of 1:0.5, react at 100-140°C until the acid v...
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