High-elasticity high-strength weather-resistant acrylic polyurethane coating and preparation method thereof
An acrylic polyurethane, high-strength technology, used in polyurea/polyurethane coatings, polyester coatings, anti-corrosion coatings, etc., can solve problems such as shortening the maintenance period of concrete structures, accelerating internal corrosion of concrete, affecting external appearance, and achieving excellent chemical resistance. Corrosive, maintenance cost saving, high weather resistance effect
Active Publication Date: 2021-06-29
NANJING CHANGJIANG PAINT
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Problems solved by technology
Due to the lack of tensile resistance of traditional anti-corrosion coatings, when the concrete substrate cracks, the anti-corrosion coating on the surface will also crack, which will not only accelerate the internal corrosion of concrete, but also affect the external appearance
In response to this situation, the traditional method is to remove the surface coating and repair the concrete, which shortens the maintenance period of the entire concrete structure and increases maintenance costs.
Method used
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Embodiment 1～3
[0043] The preparation method of embodiment 1~3 and comparative example 1~4:
[0044] The preparation method of A component comprises the steps:
[0045] First, the modified hydroxyacrylic resin, polyester resin, dispersant, and solvent are stirred at high speed to disperse evenly to obtain a mixture; secondly, add elastic powder at a rate of 50g / min under stirring (do not touch the wall of the kettle and the stirring shaft), and disperse evenly Add pigment and disperse evenly at high speed, and disperse through a grinder until the fineness is ≤20μm; add modified polyol, plasticizer, organic drier, and leveling agent to the dispersed slurry, and disperse evenly to obtain component A;
[0046] The preparation method of B component comprises the steps:
[0047] Add the formulated amount of HDI trimer curing agent, modified isocyanate elastic curing agent, and sec-butyl acetate into the stirring tank, and disperse evenly;
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The invention discloses a high-elasticity high-strength weather-resistant acrylic polyurethane coating and a preparation method thereof, and belongs to the field of heavy corrosion prevention. An anticorrosive paint is composed of a component A and a component B, wherein the component A is composed of the following components: modified hydroxy acrylic resin, polyester resin, modified polyol, elastic powder, a pigment, a plasticizer, an organic drier, a dispersant, a leveling agent and a mixed solvent; and the component B is composed of the following components: an HDI tripolymer curing agent, a modified isocyanate elastic curing agent and a solvent. Through the interaction of the components, the coating has the characteristics of high tensile strength, high elongation at break and high weather resistance, can be applied to the surfaces of concrete structures of bridges, tunnels and municipal engineering, prolongs the service life of a coated object, and saves the maintenance cost.
Description
technical field [0001] The invention relates to the field of heavy anticorrosion, and relates to a highly elastic and high-strength weather-resistant acrylic polyurethane coating and a preparation method thereof, which can be used for anticorrosion coating of concrete structures of bridges, tunnels and municipal engineering. Background technique [0002] At present, a large number of concrete structures are used in bridges, tunnels and municipal projects. However, after long-term exposure to the sun and rain, high and low temperature environment changes, due to the lack of flexibility and tensile resistance of its own inorganic structure, the surface is prone to cracking. . Due to the lack of tensile resistance of traditional anti-corrosion coatings, when the concrete substrate cracks, the anti-corrosion coating on the surface will also crack, which will not only accelerate the internal corrosion of concrete, but also affect the external appearance. In response to this situ...
Claims
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IPC IPC(8): C09D175/04C09D167/00C09D5/08
CPCC09D175/04C09D5/08C08L67/00
Inventor 吴远程张卫中
Owner NANJING CHANGJIANG PAINT