Production method of 180-level polyurethane wire enamel

Abstract

The invention discloses a production method of 180-level polyurethane wire enamel; hydroxyl-surplus primary polyurethane and a polyurethane closure are used for preparing a paint, during synthesis of the hydroxyl-surplus primary polyurethane, m-cresol / p-cresol is used for dissolving 1, 4-cyclohexanedimethanol, neopentyl glycol and trimethylolpropane, then pure MDI (methylene diphenyl diisocyanate) melted and liquefied in advance is used for reaction, and then the m-cresol / p-cresol and xylene are used for dilution; when in synthesis of the polyurethane closure, first the trimethylolpropane is added, then xylenol is used to dissolve the trimethylolpropane, then under the protection of nitrogen, the liquefied MDI is added, the MDI and the trimethylolpropane first react for chain extension reaction, then the cresol and the xylene are used for dilution; the hydroxyl-surplus primary polyurethane and the polyurethane closure are used for preparing the paint in a set ratio. The 180-level polyurethane wire enamel has excellent performances of heat shock resistance and softening breakdown resistance, is energy-saving in production process, may not produce by-products which are harmful to the environment, and is conducive to environment protection.

Description

technical field [0001] The invention relates to a production method of polyurethane wire enamel, in particular to a production method of 180-grade polyurethane wire enamel, which belongs to the field of wire enamel production. Background technique [0002] With the development of modern industry, people have higher and higher requirements for electrical and electronic equipment in terms of safety, high efficiency, and energy saving, and electrical and electronic equipment is also showing a trend towards small and light weight. However, the miniaturization and lightening of components will inevitably lead to an increase in the temperature of their working environment, and the heat resistance level of the enameled wire varnish that plays an insulating role in the coils of components also needs to be increased accordingly. The main items to measure the heat resistance of enameled wire are thermal shock resistance and softening breakdown resistance. [0003] If it is said that ...

AI Technical Summary

Problems solved by technology

Since the REACH regulations issued by the European Union have included tributyltin oxide, dibutyltin and other organotin catalysts in the list of substances of very high concern (SVHC), the use of monobutyltin oxide, etc. up the risk