Water-based paint for steel tube external protection and preparation method of water-based paint

Abstract

The invention discloses a water-based paint for steel tube external protection. The water-based paint is prepared from the following raw material constituents in percentage by weight: 20.0-35.0% of an waterborne epoxy emulsion, 15.0-25.0% of water-based acrylic resin I, 15.0-25.0% of water-based acrylic resin II, 0.5-2.0% of propylene glycol, 2.0-5.0% of butyl cellosolve, 0.1-1.0% of a flash-rust inhibitor, 0.5-1.0% of a corrosion inhibitor, 0.5-2.0% of a salt spray resistant additive, 0.1-0.5% of a bactericide, 0.1-0.5% of a wetting agent, 0.05-0.5% of a defoaming agent, 0.1-1.0% of a thickening agent, and 21.3-27.5% of deionized water; the water-based paint is prepared from the following steps: (1) preparing the raw materials; (2) burdening and dispersing; (3) filtering and packaging. The water-based paint disclosed by the invention belongs to the varnish system; the dry film thickness of the paint is only 20-30 microns; the water-based paint is good in adhesive force, corrosion resistance and water penetration resistance; the surface gloss of the coating can be up to 90 degrees, the salt spray resistance property can be up to 300 hours above, and the outdoor weather resistance can be more than 1 year.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based coating suitable for protecting the outer layer of steel pipelines and a preparation method thereof. Background technique [0002] The use of metal pipelines for the transportation of domestic and industrial resources is a common means used in urban construction and industry at this stage, such as: urban gas supply, water supply, heat supply transportation; industrial oil transportation, natural gas transportation, etc. In pipeline transportation, the protection of metal pipelines is particularly important. In the past, solvent-based coatings were mainly used to protect the outer surface of metal pipes. With the increasing impact of solvent-based coatings on the human environment and a series of incidents caused by solvent-based coatings, people's awareness of environmental protection is constantly improving, and environmental protection regulations restricting th...

AI Technical Summary

Problems solved by technology

[0004] At present, the existing water-based coatings for the outer protection of steel pipelines generally have a salt spray resistance of more than 300 hours, but almost all of them are pigmented paint systems. After adding a large amount of anti-corrosion pigments and fillers, the thickness of the dry film is at least 50-60 microns, not only high cost and high material consumption, but also the gloss of the coating film is average