Coating method for high-speed rail concrete surface strong waterproof thin coating type polyurethane paint

Abstract

The invention discloses a coating method for a high-speed rail concrete surface strong waterproof thin coating type polyurethane paint. The polyurethane paint is composed of sealing paint, priming paint and surface paint, and each paint comprises resin a resin component and a curing component, the resin component is based on polyether polyol, a chain extender, a catalyst, and a film-forming agent, and the curing component consists of isocyanate and a solvent. During preparation, the resin components and curing components of the tree paints are prepared respectively. During construction, firstly the resin components and curing components of the tree paints are mixed evenly for coating, the sealing paint is arranged on a concrete surface to form a sealing paint layer, the priming paint is disposed on the upper surface of the sealing paint layer and forms a priming paint layer, and the surface paint is arranged on the upper surface of the priming paint layer and forms a surface paint layer. The waterproof paint provided by the invention has strong adhesion, can form a strong waterproof layer on the concrete surfaces of high-speed rail projects, and the overall coating thickness is reduced, thus being convenient and safe to use.

Description

[0001] The application of the present invention is a divisional application of the parent application "High-speed rail concrete surface strong waterproof thin-coated polyurethane coating and its coating method". The application number of the parent application is 2014104747061, and the application date of the parent application is September 17, 2014 day. technical field [0002] The invention belongs to the technical field of polymer coatings, and more specifically relates to thin-coated polyurethane coatings and a coating method thereof, which are mainly used as concrete surface waterproofing paints for high-speed rail projects. Background technique [0003] my country's high-speed rail concrete pavement, bridge deck waterproof layer materials and structures are still commonly used in the previous ordinary railway concrete pavement bridge deck waterproof layer standard TB / T2965-2011 "Technical Conditions for Railway Concrete Bridge Deck Waterproof Layer" three waterproof lay...

AI Technical Summary

Problems solved by technology

[0004] This first-generation spray-coated polyurea product used in the waterproof layer structure of high-speed rail track concrete pavement and bridge surface can be used outdoors and has certain weather resistance, but its adhesion to concrete pavement and bridge deck is poor. It is prone to cracks and large areas of peeling and other failures of the waterproof layer, which will have a serious impact on the safe operation of the high-speed rail

Moreover, this first-generation polyurea product must use special spraying equipment for coating construction, which is difficult to construct in some special terrain conditions

In addition, this kind of product has been verified, and the coating must reach a thicker thickness, usually more than 2mm, to achieve the waterproof effect, the consumables are large, and the use cost is high

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