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A composite coating and automobile chassis technology, applied in coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc., can solve problems such as paint film scratches, achieve the effects of improving weather resistance, anti-corrosion performance, and energy saving
Inactive Publication Date: 2019-10-01
CHINA FIRST AUTOMOBILE
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Summary
Abstract
Description
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Problems solved by technology
In particular, the overall spraying of the chassis adopts polyurea bottom-surface-integrated paint, which solves the problem of scratches on the paint film of various parts during the assembly process, and is at the leading level in the same industry in China
Method used
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Embodiment 1
[0022] The polyurea coating is composed of component A and component B. The components A and B are mixed according to the mass fraction of 100:18.9. The component A includes 28.5% of polyaspartic acid ester resin and 19.1% of environmentally friendly zinc phosphate , Precipitated barium sulfate 24.6%, Strontium yellow 4.8%, Polyurethane dispersant 2%, Silicone defoamer 0.5%, Polyurethane leveling agent 0.5%, Polyethylene wax 3%, Bentonite 4%, Thinner 13%. Component B is 60% isocyanate and 40% diluent.
[0023] Composite coating is formed by the following coating method: electrophoretic primer grinding and wiping (room temperature, 4min) → manual spraying of composite coating (temperature 22°C, spraying two coats, time 7min) → leveling (temperature ≥ 18°C, 5min)→drying (80°C, convective heating for 10min, convective heat preservation for 10min)→manual inspection (room temperature, 4min)→products sent to the final assembly plant.
[0024] Construction parameters of polyurea coa...
Embodiment 2
[0027] Overall spray composite coating for commercial vehicle chassis:
[0028] The polyurea coating is composed of component A and component B. The components A and B are mixed according to the mass fraction of 100:18.5. The component A includes 29% of polyaspartic acid ester resin and 19.6% of environmentally friendly zinc phosphate , Precipitated barium sulfate 24.7%, Strontium yellow 4.3%, Polyurethane dispersant 2%, Silicone defoamer 0.5%, Polyurethane leveling agent 0.5%, Polyethylene wax 3%, Bentonite 4%, Thinner 12.4%. Component B is 60% isocyanate and 40% diluent.
[0029] The composite coating is formed by the following coating method: grinding and wiping the parts coating (room temperature, 3.5min) → upper masking (room temperature, 4min) → manual spraying of the composite coating (temperature ≥ 18°C, spraying two coats, time 5.5min)→Manual paint touch-up (temperature ≥18℃, time 2min)→unmasking (2.5min)→leveling (temperature≥18℃, 2min)→drying (50℃, convective heati...
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Abstract
The invention discloses an automobile chassis part composite coating and belongs to the technical field of automobile coating. The composite coating consists of two coating layers, wherein the first layer is an electrophoretic coating layer or a powder coating layer or a primer coating layer, and the second layer is a polyurea coating layer. The polyurea coating layer consists of a component A anda component B, wherein the component A comprises, by mass percentage, 28-30% of polyaspartic acid ester resin, 19-20% of environment-friendly zinc phosphate, 24-25% of precipitated barium sulfate, 4-5% of strontium yellow, 2% of a polyurethane dispersant, 0.5% of an organic silicon defoaming agent, 0.5% of a polyurethane leveling agent, 3% of polyethylene wax, 4% of bentonite and 10-15% of a diluent; the component B comprises, by mass percentage, 60-75% of isocyanate and 35-40% of a diluent. Polyurea bottom surface integrated paint is sprayed onto the original primer coating layer, and the automobile chassis part composite coating has the advantages that the coating can be dried quickly at the low temperature, energy is saved, and the production efficiency is improved; the construction solid content is as high as 65% or above, the VOC content is low, and the automobile chassis part composite coating has the advantages of saving energy and reducing emission and accords with the development trend of environmentally friendly and high-quality automobile coating.
Description
technical field [0001] The invention belongs to the technical field of automobile coating, and in particular relates to a composite coating for automobile chassis parts. Background technique [0002] After the painted automobile chassis parts are installed on the whole vehicle, most of the parts are exposed outside and directly exposed to the atmospheric environment. In other words, the coating of the chassis parts must have good corrosion resistance and good weather resistance Performance, such as commercial vehicle frame, axle, fuel tank and other coatings. At present, the coating process commonly used for automobile chassis parts is: 1) Conversion coating treatment + electrostatic spraying epoxy polyester powder coating + drying (180-200°C X 20-30min), and the paint film thickness is (50-70) μm. The coating has excellent corrosion resistance, but has no weather resistance. This process is suitable for chassis parts with no inner cavity and simple structure, such as fende...
Claims
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Application Information
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