High-density underwater epoxy repair adhesive and preparation method and application thereof

Abstract

The invention relates to a high-density underwater epoxy repair adhesive and a preparation method and application thereof. The high-density underwater epoxy repair adhesive comprises a component A anda component B, wherein the component A comprises, in parts by mass, 50-100 parts of bisphenol A-type epoxy resin, 0-50 parts of low-viscosity amino-phenolic tri-functional group epoxy resin, 0-15 parts of a reactive diluent, 0-10 parts of a thixotropic agent and 20-60 parts of active silicon micropowder, and the component B includes, in parts by mass, 30-60 parts of Mannich modified phenolic amine, 20-50 parts of modified alicyclic amine and 0-600 parts of steel slag powder. The high-density underwater epoxy repair adhesive is applied to repairing of underwater buildings, and has the advantages of environmental protection, fast solidification, high density and high bonding strength.

Description

technical field [0001] The invention relates to the field of preparation of epoxy repair glue, in particular to a high-density underwater epoxy repair glue and its preparation method and application. Background technique [0002] Epoxy resin has good adhesion to both concrete and steel bars, and is often used for repair and reinforcement of buildings. However, the repair of underwater buildings is much more difficult than that of water buildings. The repair of water buildings only requires repair glue to replace air and firmly bond with the surface of the building, while the repair of underwater buildings requires repair glue to replace water and closely adhere to the surface of underwater buildings. Therefore, materials for repairing buildings on the ground, such as houses, bridges, roads, etc., cannot successfully realize the restoration of underwater buildings. [0003] The surface affinity of concrete is strong, water is firmly adsorbed on the concrete, and epoxy resin ...

AI Technical Summary

Problems solved by technology

However, most active diluents and defoamers are hydrophilic materials, which will dissolve in water and cause water pollution, and the bubbles in the water are caused by the hydrophilic part of the epoxy repair glue being squeezed into the water, and the vacant part inside the glue will cause holes. Adding can not defoam; and the density of quartz sand, silica powder, cement and other fillers is 2.65 ~ 3.15g / cm 3 , the density of the prepared underwater epoxy repair glue is small, the ability of the glue to discharge the water layer on the surface of the underwater building by its own gravity is weak, and the bonding strength is not optimal.

CN103964747B discloses a weather-resistant and quick-drying pavement damage repair material, which can be quickly cured at room temperature, and has good interface adhesion, xenon lamp resistance, heat and humidity resistance, and good cold and heat aging resistance. However, the invention is completed after curing in a dry environment. The wet heat aging and cold heat aging are carried out instead of curing directly under low temperature water. The curing agent used in this scheme is modified phenalkamine, which is only suitable for curing the wet surface and cannot be normally cured under water.

CN10791598A discloses an epoxy grouting repair material for underwater pier repair and its preparation method. Modified aliphatic amine is used as a curing agent, which can be used for normal curing under water, and has a similar expansion coefficient to concrete, but The diluent AGE does not contain water-blocking groups—benzene rings. The coupling agent, defoamer, and leveling agent have small molecules and strong hydrophilicity. They are all soluble in water, which will cause epoxy glue to be in water. The ratio of the ratio is changed, and the bond strength is not optimal

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