Thick-coating quick-drying cold-spraying zinc sealing agent and construction method thereof

Abstract

The invention discloses a thick-coating quick-drying cold-spraying zinc sealing agent. The sealing agent comprises an agent A and an agent B, wherein the agent A at least comprises the following components in parts by mass: 20 to 30 parts of phenol; 25 to 35 parts of paraformaldehyde; 30 parts to 40 parts of diethylenetriamine; 20 to 25 parts of thiourea; and 1 to 2 parts of an accelerant; and the agent B at least comprises the following components in parts by mass: 30 to 50 parts of epoxy resin; 30 to 60 parts of a solvent; 0.5 to 2 parts of a cosolvent; 1 to 2 parts of a coloring agent; 0.5 to 1.5 parts of a defoaming agent; 20 to 50 parts of a curing agent; and 0.1 to 1 part of a supramolecular auxiliary agent. according to the invention, a step-by-step coating method is adopted, and the rapid curing effect of the agent A on epoxy resin and the permeation effect of the agent A on the cold-sprayed zinc layer are utilized, so that the firm combination of the epoxy resin sealing layer and the cold-sprayed zinc layer and the compactness of hierarchical curing are realized, and the rapid spraying of a thicker sealing layer can be realized.

Description

technical field [0001] The invention relates to the technical field of cold-sprayed zinc anticorrosion systems, in particular to a thick coating and quick-drying cold-sprayed zinc sealant and a construction method thereof. Background technique [0002] Cold spray zinc anti-corrosion is a new technology system for steel structure anti-corrosion. Its anti-corrosion functional coating generally only contains less than 4% (mass fraction, the same below) of organic additives, and the rest (above 96%, or even 99%) are high-purity Compared with the traditional epoxy zinc-rich sealing coating, it has three main advantages: first, the zinc content of the cold spray zinc coating is much higher than that of the traditional epoxy zinc-rich sealing coating (50% to 80%), and its The protection effect per unit mass is higher, especially in bridges, ports and other high-humidity, strong-corrosion application environments with potential long-term protection advantages; Problems such as brit...

AI Technical Summary

Problems solved by technology

At present, the conventional technical means is to use the mature epoxy resin primer system, but in fact, the protective effect of this method is not good, and the adhesion of the primer will be further reduced during on-site coating construction in high humidity areas such as bridges and ports. , and even lead to problems such as peeling of the paint. This is because after the construction of the epoxy zinc-rich primer, the epoxy resin content of the layer to be protected exposed in the air is relatively high, and a good adhesion can be obtained by directly applying the normal epoxy resin sealer paint. combined effect

However, the content of organic additives in the cold sprayed zinc coating is very small, and the protective layer can be considered as a relatively pure metal zinc layer. After curing, the intermolecular force between epoxy resin and epoxy resin is relatively weak. If the traditional epoxy resin is still applied Resin sealer paint will inevitably lead to problems such as poor bonding and peeling off of the paint film

Based on the above background, the current national standard for the adhesion of sealing primers for cold spray zinc is only set to be greater than or equal to 3MPa, which is far lower than the adhesion standard of sealing primers for epoxy zinc-rich coatings (greater than or equal to 5MPa, standard number), Although it can meet the demand in general occasions, this standard is still difficult to meet the actual needs of long-term protection in high humidity places such as bridges and ports.

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