Methacrylic resin modified polyurethane waterproof coating for concrete bridge deck of railway ballast track bridge and preparation method thereof

Abstract

The invention discloses a methacrylic resin modified polyurethane waterproof coating for the concrete bridge deck of a railway ballast track bridge and a preparation method thereof. The waterproof coating is prepared from a component A and a component B in a mass ratio of (4 to 6) to 1; the component A is prepared from the following raw materials in parts by weight: 30 to 50 parts of hydroxy methacrylic resin, 30 to 50 parts of active methacrylic resin, 0.5 to 2 parts of N,N-dimethyl-p-toluidine, 0.5 to 2 parts of anti-settling aid, 5 to 20 parts of pigment, 10 to 20 parts of filler, 0.5 to 1 part of wetting dispersant, 0.5 to 1 part of defoaming agent, 0.1 to 0.5 part of ultraviolet light absorber and 0.1 to 0.5 part of light stabilizer; the component B is prepared from the following raw materials in parts by weight: 10 to 20 parts of hexamethylene diisocyanate trimer, 10 to 20 parts of butyl acetate and 1 to 3 parts of benzoyl peroxide. The waterproof coating film of the invention can be well adhered to a concrete base surface and cannot easily peel off and fall off, meanwhile, the waterproof coating film also has excellent mechanical properties and can replace the existing waterproof layer for the bridge deck of a ballasted track passenger special line.

Description

technical field [0001] The invention relates to the technical field of waterproof coatings, in particular to a methacrylic acid resin modified polyurethane waterproof coating for railway ballasted track bridge concrete decks and a preparation method thereof. Background technique [0002] At present, polymer-modified asphalt waterproofing membranes are mainly used for the waterproof layer of railway ballasted track concrete bridge decks. However, from the perspective of the application effect of waterproofing membranes, there are many hidden dangers. The root cause of this phenomenon is that although the asphalt waterproofing membrane has a certain tensile strength and elongation at break, it is relatively soft as a whole, unable to withstand the rolling penetration of railway ballast, and cannot be fully adhered to the base surface. It is impossible to prevent the occurrence of water channeling, and a damage will cause the entire waterproof layer to fail. [0003] Existing ...

AI Technical Summary

Problems solved by technology

The common disadvantages of polyurethane and polyurea waterproof coatings are that they cannot be applied when they are wet, they are not resistant to ultraviolet aging, they are not resistant to hydrolysis, and there are many contradictions between construction and use.

The single component is mainly based on asphalt, which is divided into two types: oily and water-based. After the construction of oil-based polymer modified asphalt waterproof coating, a large amount of solvent volatilization in the coating will pollute the environment and cause harm to the construction workers. There is also a large fire hazard during the construction process. , so its application is very limited

The amount of rubber modifier added to water-based polymer-modified asphalt waterproof coatings is affected by the emulsification technology. Small additions lead to low mechanical indicators such as elasticity and strength of the coating film; the coating is a granular suspension, and the adhesion to the base surface is small after curing. ;The solid content is low, multi-channel construction is required to achieve the design thickness, and the construction efficiency is low. Its application in the fields of transportation, heavy anti-corrosion, and exposed waterproofing is limited

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