A kind of water-based stripping type magnesium aluminum alloy casting coating and preparation method thereof
A magnesium-aluminum alloy and casting coating technology, which is applied in the direction of coating, etc., can solve the problem that the flexibility and adhesion of the coating do not meet the ideal requirements, the water resistance and solvent resistance of the film layer are not ideal, and the heat resistance and acid resistance of the film layer , poor alkali resistance and other problems, to achieve the effect of high thermochemical stability, high refractoriness, and clear outline
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Embodiment 1
[0031] Example 1: Preparation of water-based peeling-type magnesium-aluminum alloy casting coating
[0032] Including the following steps:
[0033] (1) Preparation steps of modified attapulgite powder:
[0034] A. Weigh the attapulgite clay with a fineness of 200-400 mesh, put it into distilled water, add hydrochloric acid, treat it at 90°C for 2 hours, and stir for 3 hours to prepare a suspension for later use; wherein, each gram of attapulgite Add 9ml distilled water in the stone clay; Add 0.8ml hydrochloric acid in every gram of attapulgite clay, and the concentration of hydrochloric acid is 1mol / L;
[0035] B. Add composite active agent to the suspension prepared in step A, add dropwise NaOH solution to adjust the pH value of the suspension to 7, then stir for 3 hours to prepare the suspension, and set aside; wherein, add 0.08ml per gram of attapulgite clay Composite active agent; composite active agent is that the volume ratio of epoxy polysiloxane and alkylphenol polyo...
Embodiment 2
[0041] Example 2: Preparation of water-based stripping magnesium-aluminum alloy casting coating
[0042] Including the following steps:
[0043] (1) Preparation steps of modified attapulgite powder:
[0044] See Example 1.
[0045] (2) Preparation steps of water-based peeling type magnesium-aluminum alloy casting coating:
[0046] A. get the modified attapulgite powder 25g prepared by step (1), lithium-based bentonite 5g, nano-zirconia powder 10g, graphite powder 6g, chromite powder 5g and ball mill 3h with a planetary mill at a speed of 188 rev / min , sieved through a 200-mesh fine sieve to obtain the mixture;
[0047] B. Mix the above mixture with 45g of water, add 4g of dispersant, put it into a ball mill and mill it at a speed of 188 rpm for 2h, then add 15g of binder and 0.5g of defoamer, put it into the ball mill again at 188 rpm Min speed ball milling for 3 hours to obtain a water-based peeling magnesium-aluminum alloy casting coating, wherein the dispersant is ammoniu...
Embodiment 3
[0048] Example 3: Preparation of water-based peeling-type magnesium-aluminum alloy casting coating
[0049] Including the following steps:
[0050] (1) Preparation steps of modified attapulgite powder:
[0051] A. Weigh the attapulgite clay with a fineness of 200 mesh and put it into distilled water, add hydrochloric acid and treat it at 80°C for 1 hour, and then stir for 2 hours to prepare a suspension for later use; wherein, each gram of attapulgite clay Add 8ml distilled water in; Add 0.5ml hydrochloric acid in every gram of attapulgite clay, the concentration of hydrochloric acid is 1mol / L;
[0052] B. Add composite active agent to the suspension prepared in step A, add NaOH solution dropwise to adjust the pH value of the suspension to 6, then stir for 2 hours to prepare the suspension, and set aside; wherein, add 0.05ml per gram of attapulgite clay Composite active agent; composite active agent is that the volume ratio of epoxy polysiloxane and alkylphenol polyoxyethyle...
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