One-component polyurethane waterproof coating for facade spraying and preparation method thereof

Abstract

The invention provides a one-component polyurethane waterproof coating for facade spraying and a preparation method thereof. The coating comprises the following components: 22-26 parts by weight of polyether polyol, 6-8 parts by weight of diisocyanate, and 20-20 parts by weight of plasticizer 25 parts by weight, 35-40 parts by weight of pigments and fillers, 0.1-0.3 parts by weight of chain extenders, 0.5-1 parts by weight of reactive thixotropic agents, 0.1-0.2 parts by weight of catalysts, 0.1-0.3 parts by weight of defoamers, and 9 parts by weight of solvents ~11 parts by weight; the chain extender is selected from 4,4'-diamino-3,3'-dichlorodiphenylmethane or dimethylthiotoluenediamine; the reactive thixotropic agent has a solid content of 48 ~52% polyurea solution. Compared with the prior art, the invention solves the problem of running and hanging of the polyurethane waterproof coating when it is applied on the facade and slope; it can be applied by spraying, which effectively reduces the construction labor cost, especially on the facade.

Description

Technical field: [0001] The invention belongs to the field of coatings, in particular to a facade spraying single-component polyurethane waterproof coating and a preparation method thereof. Background technique: [0002] At present, some large-scale projects in China, such as basement walls of large-scale system venues, tunnels, subways, high-speed rails, civil air defense, etc., require waterproofing construction on facades or slopes. However, due to the facade or slope surface, the construction is inconvenient and prone to quality problems. With waterproof paint, a seamless waterproof layer can be formed, but when the general-purpose paint is applied to the facade or slope, it will flow, causing the upper part to be thin and the lower part to be thick. The thickness of the upper coating film is not enough, and the surface thickness of the coating film is uneven. If you want to paint a coating film with a thickness of 1.5-2.0mm, you may need to paint it seven or eight tim...

AI Technical Summary

Problems solved by technology

At present, there is a great demand for non-sag polyurethane waterproof coatings for facades or slopes. However, it is difficult to meet the two requirements of "no-sag" and "can be sprayed" at the same time, and there is no suitable one on the market. Non-sag, spray-appliable polyurethane waterproof coating for façades or slopes

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