Chromium-free coating agent and preparation method thereof
The technology of a coating agent and a silane coupling agent is applied in the field of chromium-free coating agent and its preparation, which can solve the problems of failing to meet the requirements of the process, high product cost and high cost, and achieve the improvement of adhesion and corrosion resistance. Short, easy-to-manage effects
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Embodiment 1
[0051] Each 1000Kg chrome-free coating agent is made from the following raw materials:
[0052] Fluorozirconic acid 20Kg, silane coupling agent (KH-550) 20Kg, silane coupling agent (KH-560) 3Kg, zirconium oxychloride 8Kg, citric acid 5Kg, water 944Kg.
[0053] Its preparation method comprises the following steps in turn:
[0054] (1) Add water to the reactor;
[0055] (2) Add silane coupling agent KH-550 into the reaction kettle, and stir until the silane coupling agent is completely hydrolyzed, and the stirring time is 7-9 hours;
[0056] (3) Add silane coupling agent KH-560 into the reaction kettle, and stir until the silane coupling agent is completely hydrolyzed, and the stirring time is 7-9 hours;
[0057] (4) Add fluozirconic acid to the reaction kettle, stir evenly, and make the solution clear, and the stirring time is 0.5-1.5 hours;
[0058] (5) Add zirconium oxychloride into the reaction kettle, stir evenly, and make the solution clear, and the stirring time is 0.5-1...
Embodiment 2
[0067] Each 1000Kg chrome-free coating agent is made from the following raw materials:
[0068] Fluorozirconic acid 20Kg, silane coupling agent (KH-550) 50Kg, silane coupling agent (KH-560) 3Kg, zirconium oxychloride 8Kg, citric acid 5Kg, water 914Kg.
[0069] The preparation method and the use method are the same as those in Example 1.
Embodiment 3
[0071] Each 1000Kg chrome-free coating agent is made from the following raw materials:
[0072] Fluorozirconic acid 40Kg, silane coupling agent (KH-550) 30Kg, silane coupling agent (KH-560) 5Kg, zirconium oxychloride 10Kg, citric acid 7Kg, water 908Kg.
[0073] The preparation method and the use method are the same as those in Example 1.
[0074] The preparation method is the same as in Example 1.
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