A kind of self-healing waterborne epoxy/bitumen composite waterproof coating and preparation method thereof

Abstract

The invention relates to a self-repairing waterborne epoxy / asphalt compound waterproof coating and a preparation method thereof, belonging to the technical field of a coating. According to the technical scheme, the method comprises the following steps: utilizing polyether polyol and MDI-50 to compound a polyurethane prepolymer with -NCO content of 20%; dipping 30-50 micron of water absorbent in the polyurethane prepolymer till being saturated; dispersing in paraffin molten mass; atomizing, quickly freezing and generating paraffin for wrapping a high water absorbent microcapsule containing the polyurethane prepolymer; dispersing the microcapsule in water, thereby forming a microcapsule dispersing solution containing the high water absorbent microcapsule; mixing the water-borne epoxy resin emulsion, waterborne epoxy curing agent, emulsified asphalt, butadiene-acrylonitrile latex, microcapsule dispersing solution, padding and additives and curing into a film, thereby forming the waterborne epoxy / asphalt compound waterproof coating with a self-repairing function. When the waterproof material is scratched and cracked, the high water absorbent in the microcapsule can quickly absorb water for swelling and the polyurethane prepolymer can participate into chain extension reaction for generating solid while meeting water, so that the purposes of quickly repairing the cracks and preventing water leakage can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a self-repairing water-based epoxy / bitumen composite waterproof coating and a preparation method thereof. Background technique [0002] At present, the main method of preparing self-healing coatings is to add microcapsules (microspheres) with certain functions. When the coating is damaged, the microcapsules are broken, and the chemical properties of the capsule core material are used to repair the damaged coating. Microcapsules are mainly prepared by in-situ polymerization, and epoxy resin, phenolic resin and other polymers are used as wall materials to wrap a certain functional core material to achieve the self-repairing function. Traditional self-healing materials have complex raw materials and cumbersome preparation processes, and are mainly reactive repairs, so self-healing takes a long time. However, self-repairing materials are mostly based on inorganic plugging agents, p...

AI Technical Summary

Problems solved by technology

Only suitable for cement concrete material, the material composition is relatively complex, and the preparation process is cumbersome

And not suitable for the field of coatings

[0009] The various self-healing coatings (materials) mentioned above mostly use in-situ polymerized microcapsules as the repairing agent for coating damage. Mainly, the microcapsule core material needs to react with certain substances to repair cracks, the repair speed is slow, and the waterproof performance is poor

The self-repairing materials based on inorganic plugging agents such as bentonite also require the participation of polymers in the later stage of repair. Although the plugging is fast, there are many kinds of raw materials and additives, the preparation is cumbersome, and most of them serve specific fields. Not suitable for coatings

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