Electrical steel sheet provided with coating derived from a carbohydrate and a methylol resin |
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| 申请号 | US30568272 | 申请日 | 1972-11-13 | 公开(公告)号 | US3865616A | 公开(公告)日 | 1975-02-11 |
| 申请人 | ASEA AB; | 发明人 | AKERBLOM CARL-ARTUR; | ||||
| 摘要 | Electrical steel sheet is varnished with a varnish produced by forming an aqueous solution with a pH-value of at least 7 of a carbohydrate having at the most 12 carbon atoms with a resinous product containing methylol groups dissolved in an organic solvent capable of being diluted with water. The carbohydrate may be a monosaccharide, a disaccharide or a hydrolysis product of a disaccharide, starch, sulphite cellulose waste liquor, molasses or the like. | ||||||
| 权利要求 | 1. AN ELECTRICAL STEEL SHEET PROVIDED WITH A COATING DERIVED FROM A VARNISH COMPRISING A BINDER AND A SOLVENT, IN WHICH THE BINDER CONSISTS ESSENTIALLY OF A MIXTURE OR A PARTIALLY REACTED MIXTURE OF A RESINOUS PRODUCT CONTAINING METHYLOL GROUPS AND A CARBOHYDRATE MATERIAL CONSISTING ESSENTIALLY OF A CARBOHYDRATE WITH A CARBON CHAIN HAVING AT THE MOST 12 CARBON ATOMS, SAID RESINOUS PRODUCT CONSISTING ESSENTIALLY OF AT LEAST ONE PRODUCT SELECTED FROM THE GROUP CONSISTING OF PHENOLIC RESINS, MELAMINE RESINS AND UREA RESINS AND HAVING THE CAPACITY TO DISSOLVE IN AN ORGANIC SOLVENT CONSISTING OF A MIXTURE OF EQUAL PARTS BY WEIGHT OF ACETONE AND ETHONAL TO FORM A SOLUTION CONTAINING 50 PER CENT BY WEIGHT OF THE RESINOUS PRODUCT, WHICH SOLUTION IS CAPABLE OF BEING DILUTED WITH AT LEAST AS MUCH WATER AS THE QUANTITY OF ORGANIC SOLVENT WITHOUT PRODUCING PRECIPITATION OF THE RESINS, IN WHICH OF THE TOTAL WEIGHT OF THE CARBOHYDRATE AND THE RESINOUS PRODUCT CONTAINING METHYLOL GROUPS, THE WEIGHT OF THE CARBOHYDRATE IS 30-70 PER CENT AND THE WEIGHT OF THE RESINOUS PRODUCT 70-30 PER CENT. 2. An electrical steel sheet according to claim 1, in which the carbohydrate consists essentially of a monosaccharide. 3. An electrical steel sheet according to claim 1, in which the carbohydrate consists essentially of a disaccharide. 4. An electrical steel sheet according to claim 1, in which the carbohydrate consists essentially of a hydrolysis product of a substance selected from the group of disaccharides, carbohydrates having more than 12 carbon atoms and products built up of or containing mono- or disaccharides or carbohydrates having more than 12 carbon atoms. 5. An electrical steel sheet according to claim 4, in which the carbohydrate consists essentially of a hydrolysis product of starch. 6. An electrical steel sheet according to claim 4, in which the carbohydrate consists essentially of a hydrolysis product of sulphite cellulose waste liquor. 7. An electrical steel sheet according to claim 1, in which the carbohydrate consists essentially of molasses or of a hydrolysis product of molasses. 8. An electrical steel sheet according to claim 1 in which the varnish contains an inorganic filler. 9. An electrical steel sheet according to claim 1, in which the varnish contains an organic filler in the form of finely divided polymer polythene, polypropene or polyvinyl chloride. 10. A method of manufacturing a varnish for an electrical steel sheet according to claim 1, which comprises mixing an aqueous solution of the carbohydrate with a pH-value of at least 7 with the resinous product containing methylol groups dissolved in a solvent which consists essentially of an organic solvent capable of mixing with water. 11. A method of manufacturing a varnish according to claim 10, in which the carbohydrate is formed by hydrolysis of a disaccharide, of a carbohydrate having more than 12 carbon atoms or of a product which is built up of or contains disaccharides or carbohydrates with more than 12 carbon atoms. |
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