Synthesis of Water-soluble Polyurethane Resin and Application to Electrical Insulating Enameled Wire
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概要
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The syntheses of water-soluble polyurethane (PU) resins and the application to the enameled film on electrical insulating wire were studied.<BR>PU varnishes for the enameled copper wire are used in the solvent-soluble type to satisfy the hard electrical properties, and it is desired to manufacture the good water-soluble PU resin by reason of offensive odor, toxicity, pollution and resource saving accompanied with the usage of solvent, e. g. cresol etc.<BR>Generally, for the synthesis of water-soluble resin, it is usual to make the water-soluble groups, by amine-neutralization of the remaining free carboxyl groups in the resin. But it is very difficult to remain the definite quantity of the free carboxyl groups in the synthesis of PU resin, since a large quantity of polyols are used as raw material.<BR>This difficulty was overcome successfully by the usage of dimethylol propionic acid in which two hydroxyl groups were more reactive preferentially than one carboxyl group.<BR>The syntheses of water-soluble PU resin were investigated on the following items : <BR>1) suitable composition of the raw material based on polyester modified PU resin<BR>2) cross-linking reagent<BR>3) modification by epoxy resin<BR>4) introduction of the blocked NCO-group<BR>The relation between the composition of raw materials in PU resin and the properties of enameled films was studied. The films on the electrical insulating copper wire prepared from the water-soluble PU varnishes based on these results were by no means inferior to ones from the commercial solvent-soluble type.
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