| 摘要 |
<p>1. Process for making readily processable electrical steel sheet with an electrically insulating, one-sided or two-sided coating by coating the steel sheet with an aqueous mixture containing a surfactant, organic constituents and inorganic constituents in the form of metal phosphates and heating the electrical steel sheet thus coated to a sufficiently high temperature for a sufficiently long time in such a way that the desired chemical reaction between the constituents of the aqueous mixture and the removal of water and any solvents present take place, characterized in that the aqueous mixture contains, in addition to water, the following components : a) 15 to 45% by mass of a first water-dilutable product of a condensation product obtained from at least one polyalcohol, at least one carboxylic acid and at least one monocarboxylic acid, b) 2.5 to 22.5% by mass of a second water-dilutable condensation product obtained from a heterocyclic ring compound or urea with formaldehyde in each case, c) 9 to 30% by mass of at least one metal phosphate, the cation of which is that of a metal from one of the first three main groups of the periodic table of the elements, d) 1.7 to 8.2% by mass of an amine, and e) 0.2 to 3.8% by mass of an amphoteric surfactant.</p> |
