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Single-component polyurethane waterproof coating capable of expanding when meeting water after film formation and preparation method thereof
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A polyurethane waterproofing and water-swelling technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of waterproof coating film rupture, building leakage, difficulty in controlling pouring conditions, etc., and achieve the effect of improving product quality
Active Publication Date: 2020-07-10
河北朴智伟业防水材料有限公司
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Problems solved by technology
[0003] However, in projects such as subway, municipal and housing construction, it is often encountered that large areas of concrete are poured. Due to the difficulty in controlling the pouring conditions and the deformation caused by factors such as temperature changes and foundation settlement in the later stage, part of the waterproof coating film is broken or damaged. The appearance of tiny cracks will cause leakage in the building, which cannot meet the waterproof requirements of underground buildings, such as basements, underground garages, open-cut subways and tunnels.
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Embodiment 1
[0030] In order to solve the problems of the technologies described above, the technical solution provided by the invention is:
[0031] The technical solution adopted by the present invention is to provide a water-swellable one-component polyurethane waterproof coating after film formation and a preparation method thereof, including the following components and mass percentage ratios:
[0033] The hydrophilic polyether polyol is polyether polyol 480, the functionality is 4, the average molecular weight is 8000, and the hydroxyl value is 22-28 mgKOH / g.
[0034] The common polyether polyol is polyether polyol 1000 with a functionality of 2, an average molecular weight of 1000, and a hydroxyl value o...
Embodiment 2
[0047] In order to solve the problems of the technologies described above, the technical solution provided by the invention is:
[0048] The technical solution adopted by the present invention is to provide a water-swellable one-component polyurethane waterproof coating after film formation and a preparation method thereof, including the following components and mass percentage ratios:
[0050] The hydrophilic polyether polyol is polyether polyol 480, the functionality is 4, the average molecular weight is 8000, and the hydroxyl value is 22-28 mgKOH / g.
[0051] The common polyether polyol is polyether polyol 1000 with a functionality of 2, an average molecular weight of 1000, and a hydroxyl value o...
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Abstract
The invention discloses a single-component polyurethane waterproof coating capable of expanding when meeting water after film formation and a preparation method thereof. By adding hydrophilic polyether, designing a polyurethane molecular structure and selecting a chain extender, the advantages of the polyurethane waterproof coating can be fully played, the water absorption rate of a coating film is improved, the coating film can expand after being dried and meeting water in the later period, a very good water stopping effect is achieved, and the problem of leakage of a base surface due to cracks can be solved. When a base layer of concrete deforms or has fine cracks, and a waterproof coating film is damaged and seeps water, the waterproof coating film can absorb water to expand, so that the effects of seepage prevention and water stop are achieved. When water is lost, the coating film restores to the original shape, can expand when meeting water again, and can be repeatedly used for many times, the service life is long, and the waterproof performance of the coating film is excellent. The process is simple and reasonable and easy for industrial production.
Description
technical field [0001] The invention relates to the technical field of waterproof paint preparation, in particular to a water-swellable one-component polyurethane waterproof paint after film formation and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating is a one-component environmentally friendly waterproof coating applied in liquid state. It solidifies after contacting with moisture in the air, forming a solid and tough seamless integral waterproof film on the surface of the base. Existing polyurethane waterproof coatings are prepolymers containing isocyanate groups formed by addition polymerization of isocyanate and polyether, together with catalysts, anhydrous additives, anhydrous fillers, solvents, etc. Processed one-component polyurethane waterproof coating. For example, Chinese patent CN107858089A discloses a one-component polyurethane waterproof coating and a preparation method thereof. Polyurethane waterproof coating film ...
Claims
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Application Information
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