Water-based high-temperature intermediate coating and preparation method thereof
A high-temperature, water-based technology, applied in coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc., can solve problems such as complex processes and achieve good anti-corrosion and protective effects
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Embodiment 1
[0047] This example provides a kind of water-based high-temperature intermediate paint, comprises the preparation raw material of following parts by weight:
[0048] Water-based polyurethane A: 15-20 parts, water-based polyurethane B: 15-20 parts, blocked isocyanate: 5-10 parts, amino resin: 5-10 parts, titanium dioxide: 15-20 parts, nano-precipitated barium sulfate: 10-15 parts parts, kaolin: 10-15 parts, filler: 3-7 parts, co-solvent: 3-5 parts, dispersant: 2-4 parts, substrate wetting agent: 0.5-1.0 parts, interface control agent: 1.0-3.0 parts parts, additives: 1.0 to 3.0 parts.
[0049] The pigment-to-base ratio of the water-based high-temperature medium paint is 2-2.5:1.
[0050] Wherein, the number average molecular weight of the waterborne polyurethane A is 4000-6000, and the hydroxyl value is 4.2. The number average molecular weight of waterborne polyurethane B is 3000-5000, and the hydroxyl value is 2.
[0051] The solid content of blocked isocyanate is 75-85%.
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Embodiment 2
[0059] This example provides the preparation method of water-based high-temperature intermediate paint, including the following steps:
[0060] S1: Add water-based polyurethane A, water-based polyurethane B, blocked isocyanate and amino resin in turn, stir at a speed of 100-200 rpm, add the remaining preparation raw materials while stirring, increase the speed to 200-300 rpm, and stir for 15-20 minutes;
[0061] S2: Increase the stirring speed to 300-400rpm, stir for 30-45min and then grind.
Embodiment 3
[0063] In this example, according to the preparation raw material ratio provided in Example 1 and the preparation method provided in Example 2, 5 kinds of coatings were prepared under the same process conditions, and the specific ratios are shown in Table 1.
[0064]Table 1 Details of paint ratio
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