Environment-friendly hydrophobic moisture-resistant cold zinc spraying sealing agent and construction method thereof

Abstract

The invention discloses an environment-friendly hydrophobic moisture-resistant cold zinc spraying sealing agent which comprises a base material, a curing agent for mixing, a polyurethane foaming material and a hydrophobic material, wherein the base material at least comprises the following components in parts by mass: 45-55 parts of epoxy resin; 30-40 parts of pigment; 4-8 parts of a reactive diluent; 5-10 parts of a silicon-based polymerization agent; 1-2 parts of thixotropic agent; 1-2 parts of a toughening agent; 0.5-1.5 parts of a defoaming agent; the curing agent for mixing at least comprises the following components in parts by mass: 80-90 parts of modified polyamide; 5-10 parts of a silicon-based polymerization agent; the polyurethane foaming material at least comprises the following components in parts by mass: 45-60 parts of oligomer polyol; 25-35 parts of isocyanate; 0.5-1 part of a chain extension cross-linking agent; 2-5 parts of a foaming agent; a step-by-step coating method is adopted, an epoxy resin-based spraying material is used as a sealing agent, a polyurethane foaming material is sprayed again, and finally graphene is sprayed, so that an overall formed sealing layer has hydrophobic and moisture-proof performance.

Description

technical field [0001] The invention relates to the technical field of cold-sprayed zinc anticorrosion systems, in particular to an environmental-friendly hydrophobic and moisture-resistant 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 advant...

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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