Thixotropic impregnating resin composition, and preparation method thereof

Abstract

The invention discloses a thixotropic impregnating resin composition. The thixotropic impregnating resin composition comprises, by weight, 15 to 35 parts of epoxy resin, 5 to 20 parts of bismaleimide, 10 to 28 parts of an anhydride, 15 to 40 parts of a diluent, 2 to 15 parts of a thixotropic agent, and 0.1 to 1 part of a drier; wherein the thixotropic agent is a nonpolar polyolefin containing double bonds. A preparation method comprises following steps: epoxy resin is delivered into a reaction kettle, is stirred, and is heated at the same time to 60 to 80 DEG C, bismaleimide is added, an obtained mixture is stirred to be uniform, and is cooled to room temperature; and the anhydride, the diluent, the thixotropic agent, and the drier are added; and uniform dispersing is realized so as to obtain the thixotropic impregnating resin composition. According to the preparation method, the nonpolar polyolefin containing double bonds is added into the thixotropic impregnating resin composition, so that thixotropic impregnating resin composition is excellent in sagging resistance, adhered lacuquer quantity is increased obviously, and mechanical properties and electrical properties of motor insulation structures are improved.

Description

technical field [0001] The invention belongs to the field of impregnating resins for electrical devices, in particular to a thixotropic impregnating resin composition and a preparation method thereof. Background technique [0002] Epoxy anhydride polymers are commonly used in impregnating electrical coils and casting electrical components such as stators, rotors, and transformers to provide electrical insulation, vibration stability of electrical coils, improved aging characteristics, and protection against chemical and mechanical influences sex. Since the miniaturization of electrical components is an increasingly important topic for high-efficiency motors, improving the overall electrical insulation performance and heat resistance level of electrical components has become an important characteristic in this regard, and regarding this, impregnating varnishes are key elements. [0003] At present, the impregnation paint used for electrical devices is mainly reflected in the...

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Problems solved by technology

[0003] At present, the impregnation paint used for electrical devices is mainly reflected in the small amount of paint hanging, and the loss of paint liquid causes manufacturing defects, which in turn reduces the weather resistance and water resistance of electrical devices.

In order to solve the problem of the amount of paint hanging in the impregnation paint, the current solution is basically to add nano-silica to ensure the amount of paint hanging. For the VPI vacuum impregnation of the dipping paint viscosity, the amount of nano-silica added is very limited, and the ability to change the amount of paint hanging is also very small

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