Water-soluble environment-friendly thickening type non-oriented silicon steel insulating coating liquid and preparation method thereof

The invention relates to the technical field of metal surface coating treatment. A water-soluble environment-friendly thickening type non-oriented silicon steel insulating coating liquid comprises, by mass, 15-35% of aluminum dihydrogen phosphate and magnesium dihydrogen phosphate composite salt, 1-5% of boric acid, 0.5-2% of zinc nitrate, 0.1-5% of an auxiliary agent, 15-40% of a thermosetting silicone acrylic emulsion and the balance deionized water, and the molar ratio of aluminum to magnesium in the aluminum dihydrogen phosphate and magnesium dihydrogen phosphate composite salt is 3.5-7.2. The invention further relates to a preparation method of the water-soluble environment-friendly thickening type non-oriented silicon steel insulating coating liquid. 本发明涉及金属表面涂镀层处理技术领域。一种水溶性环保增厚型无取向硅钢绝缘涂层液，按质量百分比计，磷酸二氢铝、磷酸二氢镁复合盐占15-35%，硼酸1-5%，硝酸锌0.5-2%，助剂：0.1-5%，热固性硅丙乳液：15-40%，余量为去离子水，磷酸二氢铝、磷酸二氢镁复合盐中，铝和镁的摩尔比为3.5-7.2。本发明还涉及该水溶性环保增厚型无取向硅钢绝缘涂层液的制备方法。