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A water-swellable one-component polyurethane waterproof coating after film formation
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A polyurethane waterproof and water-swellable technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of waterproof coating film breakage, building leakage, and unsatisfactory construction of underground buildings, etc., to overcome leakage, Good water stop effect, improve product quality effect
Active Publication Date: 2021-08-17
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, 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 of 109-115 mgKOH / g.
[0035] The ...
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, 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, the functionality is 2, the average molecular weight is 1000, and the hydroxyl value is 109-115 mgKOH / g.
[0052]The ...
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Abstract
The invention discloses a water-swellable one-component polyurethane waterproof coating after film formation, which can give full play to the advantages of the polyurethane waterproof coating by adding hydrophilic polyether, designing the molecular structure of polyurethane, and selecting a chain extender The water absorption rate of the coating film is improved, and after the coating film dries later, it can swell when it encounters water, which has a good water-stop effect and can overcome the problem of leakage of the base surface due to cracks. The product of the present invention can absorb water and swell when the base layer of the concrete is deformed or finely cracked, and the waterproof coating film is damaged and seeped, so as to play the role of preventing seepage and water. When the water is lost, the coating film returns to its original shape, and it can expand again when it encounters water again. It can be repeated many times, has a long service life, and the coating film has excellent waterproof performance. The process of the invention is simple and reasonable, and is easy for industrialized production.
Description
technical field [0001] The invention relates to the technical field of waterproof paint preparation, in particular to a one-component polyurethane waterproof paint that expands upon contact with water after film formation. 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 CN107858089 A discloses a one-component polyurethane waterproof coating and a preparation method thereof. Polyurethane waterproof coating film has many ex...
Claims
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Application Information
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