Water-based non-oriented silicon steel paint and preparation method thereof
A technology of oriented silicon steel and coating, applied in the direction of coating, etc., can solve the problems of poor water resistance of vinyl acetate emulsion, etc., and achieve the effect of good machining performance, bright and smooth coating surface, and excellent insulation
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Embodiment 1
[0039] The first step is silica sol modification. Add 16kg of deionized water and 20kg of acidic silica sol with a solid content of 25% into a 50L reactor, mix well, then add 4kg of ethanol and mix well, then slowly add 0.3kg of KH-560 to the reactor, 50°C The mixture was stirred and reacted for 3 hours to obtain a modified silica sol.
[0040] The second step is the synthesis of seed emulsion. In a reaction kettle with a volume of 100L, add 0.162kg of anionic emulsifier CO-436 and 0.325kg of nonionic emulsifier CO-897 into 4.5kg of deionized water, then add 14kg of modified silica sol and stir at 30°C for 15min, then Add 2.4kg of methyl methacrylate (MMA) and 0.8kg of butyl acrylate (BA) to pre-emulsify for half an hour, adjust the pH to 7-8 with ammonia water, and add 0.16kg of NaHCO 3 and 2kg of deionized water, continue to emulsify for half an hour, add the pre-emulsion into a 100 L reaction kettle, raise the temperature to 75°C under nitrogen protection, and then add 0...
Embodiment 2
[0045] Compared with Example 1, this example differs in that alkaline silica sol is used. The modification process of silica sol is as follows: 20 kg of deionized water is added to a reaction kettle with a volume of 50 L, and alkaline silica sol with a solid content of 25% is added. 20kg of silica sol, mix well, then add 4kg of ethanol and mix well, then acidify with 0.02kg of phosphoric acid, add 0.3kg of KH-560 into the reaction kettle in three batches within half an hour, stir and react at 50°C for 3 hours, and get Modified silica sol, all the other are the same as in Example 1, the gel rate of the obtained emulsion is larger than the acrylate emulsion modified by acidic silica sol, and the water absorption of the paint coating increases by 1.2%.
Embodiment 3
[0047] Compared with Example 1, this embodiment is that in the coating preparation stage, any one of 13 kg of INEOS amino resin HM 2608, R 747, and R 745 is used to replace amino resin 717, and first use ethanol: water according to the ratio of parts 1:3 solution 13㎏ to dissolve and dilute the resin before use, the rest is the same as Example 1, the viscosity of the coating is 25s, the hardness is above 6H (pencil hardness), the adhesion is grade A, the coating film is smooth and smooth, and the mechanical properties reach the level of silicon steel Require.
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