How to make polyester type polyurethane wire enamel with high heat resistance class?

2023-11-10 16:17:07

How to make polyester type polyurethane wire enamel with high heat resistance class?

Polyurethane enameled wires have high heat resistance with temperature ratings of 200 or more and good solderability and physical properties.

High-temperature graded PAUR wire enamel, the steps mainly include the synthesis of imine, ethanolamine-modified polyester resin, the synthesis of '-diphenylmethane diisocyanate trimer, the synthesis of end-capped isocyanate resin and the preparation of polyurethane envelope wire enamel, wherein said imine, the synthesis step of ethanolamine-modified polyester resin is prepared by: adding diethylene glycol, diethanolamine, trimethylolpropane, tris-( 2-hydroxyethyl) chloro isocyanuric acid ester and catalyst, heated to 100°C-120°C, then add imine dimer. Dimethyl terephthalate (DMT) with part of the dianhydride and modification, stirring to dissolve, heating to 140°C-150°C to react for more than 4h, heating to 220°C-230°C to react for more than 12h, when the head temperature is lower than 65°C for vacuum operation until the viscosity is between 1300-1800mPas (measured at 25°C), stop the vacuum operation, add Cresol and xylene melting until clarified and solid content constantly stirring 44% to make imine, ethanolamine modified polyester resin.