Aliphatic compound polyurea coating agent for rust prevention and water resistance

Abstract

The invention discloses an aliphatic compound polyurea coating agent for rust prevention and water resistance, wherein the aliphatic compound polyurea coating agent comprises a prepolymer solution anda resin solution, and the prepolymer solution and the resin solution are mixed in a ratio of 1:1 for use; the prepolymer solution consists of 100 wt% of isophorone diisocyanate or 100 wt% of hexamethylene diisocyanate, and isophorone diisocyanate or hexamethylene diisocyanate contains 10%-13% of NCO; the resin solution contains 50 wt%-53 wt% of polyoxypropylene diamine, 4 wt%-7 wt% of polyether ethylamine with the molecular weight of 5000, 12 wt%-14 wt% of polydiethyltoluene diamine, 25 wt%-29 wt% of polydiphenylenediamine, 1 wt%-2 wt% of a tackifier and 4 wt%-5 wt% of a pigment. The aliphatic compound polyurea coating agent not only can completely avoid yellowing phenomenon, but also has slow curing time; when coating, the aliphatic compound polyurea coating agent has good self-levelingproperty, no embossing caused by dust or fine dust, and no change in physical properties of a coating film, so the aliphatic compound polyurea coating agent can completely eliminate cracks and greatlyimproves the rust prevention performance and water resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an aliphatic compound polyurea coating agent for antirust and waterproof. Background technique [0002] Rust inhibitors are mainly used to protect metal surfaces from corrosion caused by the atmosphere, sea water, etc., as well as corrosion caused by metal oxidation, thereby maximizing the extension of the metal's service life. Chromate, phosphate, silicate and organic nitrogen-sulfur compounds are mainly used to prevent corrosion caused by moisture, and electrometallurgy can be used to prevent corrosion caused by metal oxidation. For example, metal iron can be plated with zinc, which has a faster oxidation rate than iron, and then finished with chromate to prevent metal iron from rusting; but the plating film formed in this anti-corrosion method is very easy to Therefore, this anti-corrosion method has the problem of short service life. After the plating film falls off, the co...

AI Technical Summary

Problems solved by technology

For example, metal iron can be plated with zinc, which has a faster oxidation rate than iron, and then finished with chromate to prevent metal iron from rusting; but the plating film formed in this anti-corrosion method is very easy to The substrate falls off, so this anti-corrosion method has the problem of short service life. After the plating film falls off, the corrosion of metals such as ships will be more serious in the presence of salt and water at the same time.

[0003] Existing aromatic compound-based polyurea coating agents for anti-rust and waterproof use, because the curing time is too fast, embossing is easily formed due to the existence of dust and dust during spraying, which affects the appearance of the product

In addition, the aromatic compound-based polyurea coating agent has a benzene ring structure. When the coating agent is exposed to ultraviolet light, it will destroy the chromophore, causing yellowing, and the coating will fade over time. The physical properties of the coating film of the coating agent are reduced, resulting in peeling off, and the metal surface is beginning to be corroded, cracked or chipped.

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