Preparation method of chromium-free dacromet coating solution and coating process on the surface of metal clips and metal clips
A metal and solution technology, applied to the device for coating liquid on the surface, pretreatment surface, coating and other directions, can solve the problems of affecting the adhesion strength of the coating film, uneven surface of the coating film, not easy to flow, etc., and achieve good resistance. Corrosion and scratch resistance protection, continuous and locally uniform effect on the coating surface
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preparation example 1
[0037] A preparation method of chrome-free dacromet coating solution, which is prepared through the following steps:
[0038] According to the dosage shown in Table 1, mix the silane coupling agent with the dispersant, stir evenly at 800r / min, then add the graphene-silica composite powder, silicon micropowder and ultrafine Precipitate barium sulfate, stir evenly at 800r / min, then add metal powder, water-based adhesive and water to mix, and stir evenly at 800r / min to obtain chromium-free dacromet coating solution.
[0039] Wherein, the graphene-silica composite powder is prepared by the following method:
[0040] S1. Under the conditions of 24°C, rotating speed 1500r / min, ball-to-material ratio of 5:1, and slurry concentration of 2.5%, add sodium polyacrylate with a total weight of 10% of the slurry, and grind it ultrafinely for 90 minutes to obtain the dispersion-treated The white carbon black with a median diameter of 9 μm is for subsequent use; get the sulfuric acid-contain...
preparation example 2-5
[0044] The preparation steps of the chromium-free dacromet coating solution of Preparation Examples 2-5 are exactly the same as those of Preparation Example 1, the difference lies in the composition and dosage of raw materials, as shown in Table 1 for details.
[0045] Table 1 preparation example 1-5 each raw material dosage (unit / g) of chrome-free dacromet coating solution
[0046]
preparation example 6-10
[0048] The preparation steps of the chromium-free dacromet coating solution of Preparation Examples 6-10 and Preparation Example 3 are exactly the same, the difference lies in the composition and dosage of raw materials, as shown in Table 2 for details.
[0049] Table 2 preparation example 6-10 each raw material dosage (unit / g) of chrome-free dacromet coating solution
[0050]
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