Water-based curing agent, water-based epoxy resin composition and its application in high-permeability waterproof and reinforced coatings

Abstract

The invention provides an aqueous curing agent and a waterborne epoxy resin composition, and an application thereof in a high-permeability waterproof reinforcing coating. The waterborne epoxy resin composition comprises, by weight, 100 parts of epoxy resin, 5-30 parts of a reactive diluent, 130-170 parts of an aqueous curing agent and 1-5 parts of a permeation enhancer. The aqueous curing agent isprepared through a reaction of phenol, polyetheramine, polyamine and formaldehyde according to a molar ratio of the phenol to the polyetheramine to the polyamine of 1:(0.8-1):(0.8-1.5), and is obtained through the following steps: performing a primary Mannich reaction on the phenol, polyetheramine and a first part of formaldehyde same to the polyetheramine in molar weight; and performing a secondary Mannich reaction on the remaining phenol, the obtained polyetheramine-phenol reaction product, the polyamine compound and a second part of formaldehyde, wherein a molar ratio of the polyamine compound to the second part of formaldehyde is 1:(1-1.2); and the molecular weight of the polyetheramine is 1000 to 2100.

Description

technical field [0001] The invention relates to a water-based curing agent, a water-based epoxy resin composition and an application thereof in high-permeability waterproof reinforcing coatings. Background technique [0002] As we all know, ordinary concrete will have fine voids and cracks. Water will enter the interior of the concrete through these tiny gaps and cracks, causing corrosion and deterioration of the concrete. At present, pasting waterproof membranes and painting waterproof coatings on the outside of concrete can realize the waterproof and anti-seepage function of concrete and prolong the service life of concrete. However, it is not uncommon for membranes or coatings to fail waterproofing due to bonding failure, especially on highways. In interval tunnels such as railways, subways, and high-speed rails, maintenance is very difficult, which greatly wastes financial and material resources. [0003] Epoxy resin is widely used in the field of concrete waterproofin...

AI Technical Summary

Problems solved by technology

For example, the document "Synthesis and Performance Research of Non-ionic Waterborne Epoxy Resin Curing Agent" ( painted Materials Industry, 2010, 40(10): 47-50. ) must use a polyether structure with a molecular weight of 4000, and the amount used has reached half of the amount of epoxy resin, so that the final synthetic curing agent has a larger molecular weight and higher viscosity, and high shear force is required when emulsifying epoxy resin. The water dilutability of the formed emulsion is relatively poor, resulting in a higher viscosity of the emulsion at the same solid content

It should be noted that although the molecular weight of the curing agent is closely related to its own viscosity, it is not the only factor determining the viscosity of the formed emulsion. That is to say, even if the molecular weight and viscosity of the curing agent are small, its water dilutability may not be sufficient Satisfactory, resulting in higher emulsion viscosity at the same solid content

In addition, due to the high surface tension of water, the wetting of water-based epoxy resin materials to the substrate is relatively poor, and the permeability is far inferior to solvent-based products.

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