Polyesteramide imide wire enamel and preparation method thereof
A technology of polyester amide imide and enameled wire varnish, applied in the field of polyester amide imide enameled wire varnish and its preparation, can solve the problems of poor surface state of enameled wire, influence on performance, inability of enameled wire varnish to achieve good leveling and the like, Achieving the effect of wide process margin, good coatability and improved heat resistance
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Embodiment 1
[0020] Purify the reaction device with pure nitrogen, add 0.5 parts of 4,4'-diphenylmethane diisocyanate, heat to 50°C and melt it completely, add 0.5 parts of trimellitic anhydride with stirring, and heat to 70-80°C for 6 hours. Add 1 part of cresol, raise the temperature to 130°C, and keep it warm for 3 hours. Then add 2 parts of ethylene glycol, 0.6 parts of glycerin and 1 part of terephthalic acid under stirring, raise the temperature to 220 ° C at a rate of about 10 ° C per hour, keep it warm for 2 hours, and vacuumize to the theoretical liquid output. Add some cresol solvent to lower the temperature to 180°C and keep it warm for 3 hours.
[0021] Take the resin prepared above, add some cresol and xylene, stir and dilute to the required solid content.
[0022] Use the polyester wire enamel prepared according to the above procedure to coat the enameled wire.
Embodiment 2
[0024] Purify the reaction device with pure nitrogen, add 1 part of 4,4'-diphenylmethane diisocyanate, heat to 50°C and melt it completely, stir and add 1 part of trimellitic anhydride, heat to 70-80°C for 6 hours. Add 1 part of cresol, raise the temperature to 130°C, and keep it warm for 3 hours. Then add 3 parts of ethylene glycol, 1.2 parts of glycerin and 2 parts of terephthalic acid under stirring, raise the temperature to 220 °C at a rate of about 10 °C per hour, keep it warm for 2 hours, and vacuumize to the theoretical liquid output. Add some cresol solvent to lower the temperature to 180°C and keep it warm for 3 hours.
[0025] Take the resin prepared above, add some cresol and xylene, stir and dilute to the required solid content.
[0026] Use the polyester wire enamel prepared according to the above procedure to coat the enameled wire.
Embodiment 3
[0028] Purify the reaction device with pure nitrogen, add 1 part of 4,4'-diphenylmethane diisocyanate, heat to 50°C and melt it completely, stir and add 1 part of trimellitic anhydride, heat to 70-80°C for 6 hours. Add 1 part of cresol, raise the temperature to 130°C, and keep it warm for 3 hours. Then add 2 parts of ethylene glycol, 0.6 parts of glycerin and 1 part of terephthalic acid under stirring, raise the temperature to 220 ° C at a rate of about 10 ° C per hour, keep it warm for 2 hours, and vacuumize to the theoretical liquid output. Add some cresol solvent to lower the temperature to 180°C and keep it warm for 3 hours.
[0029] Take the resin prepared above, add some cresol and xylene, stir and dilute to the required solid content.
[0030] Use the polyester wire enamel prepared according to the above procedure to coat the enameled wire.
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