Wear-resistant hydrophobic coating and method for preparing wear-resistant hydrophobic coating
A hydrophobic coating and hydrophobic modification technology, which is applied in coatings and other directions, can solve problems such as insufficient binding force, strength and corrosion resistance, and limited application
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preparation example Construction
[0045] (1) Preparation of primer
[0046] In the preparation of the primer of the present invention, commercially available nano silicon dioxide (average particle diameter 10-20nm) without surface treatment is usually used.
[0047] First, the nano-silica particles are dispersed in an organic solvent, and the organic solvent can be selected from methyl isobutyl ketone, cyclohexanone, and acetone.
[0048] A silane coupling agent containing epoxy groups is added to the above dispersion, usually under acid catalysis, so that the surface of the silica particles contains epoxy groups. The amount of the silane coupling agent containing epoxy groups may be 10-75%, preferably 10-50%, eg 35%, of the mass of the original nano-silica particles.
[0049] The above-mentioned acid may be oxalic acid, and the molar concentration of oxalic acid may be 0.0005˜0.0015 mol / L, preferably 0.001 mol / L.
[0050] Preferably, an epoxy curing agent, such as E44 epoxy resin, is further added to the ac...
Embodiment 1
[0068] Put 2g of nano-silica sphere powder (average particle diameter 20nm) and 77g of methyl isobutyl ketone into the flask, and stir for 2 hours to fully disperse the silica spheres in the solvent. After that, add a total of 1g of KH560 in 4 times with an interval of 5 minutes each time. After the addition, continue to stir for 2 hours. It is required that no gel-like substances appear during the stirring process. Afterwards, add 0.5ml of acetic acid in 4 times at intervals of 30 minutes each time, and continue to stir for 2 hours after adding, and it is required that gel-like substances should not appear during the process. Afterwards, mix the silicon sphere solution with 10 g of E44 epoxy resin and 190 g of acetone, stir well to disperse the silicon spheres evenly in the solution, and obtain the lower layer of silicon dioxide sphere A solution.
[0069] Put 2g of isophoronediamine and 0.2g of DMP curing catalyst into 20g of ethyl acetate and stir well to make a curing agen...
Embodiment 2
[0073] The difference from Example 1 is that when preparing the silica sphere A solution, the amount of silica sphere powder used is 3 g, methyl isobutyl ketone is 76 g, KH560 is 1.5 g, and acetic acid is 0.75 ml. The amount of curing agent becomes: 3 g of isophorone diamine, 0.3 g of DMP, and 19 g of ethyl acetate. The drying time after the silicon ball A is sprayed on the glass surface is 1h.
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