Anti-rust protective coating for steel material and preparation method of anti-rust protective coating

Abstract

The invention relates to an anti-rust protective coating for a steel material. The anti-rust protective coating is formed by compounding a compound rust transforming agent, thermoplastic or thermosetting resin, cement, a compound surfactant, ultrafine fibers and water, wherein according to the mass ratio, the compound rust transforming agent : thermoplastic or thermosetting resin : cement : a compound surfactant : ultrafine fibers=(0.5-15):(10-30):(20-65):(0-4):(0-5); the main ingredients of the compound rust transforming agent mainly comprise a divalent or trivalent metal oxide, a phosphate substance, an active filler and an alkali hydroxide which are compounded at the mass ratio of 2:8:8:1; the compound rust transforming agent can form a stable phosphating film and a complex precipitation film on the surface of rusted reinforcing steel bar; the surfactant is a sulfydryl-containing Gemini quaternary ammonium salt cationic surfactant and is prepared by reaction of the raw materials of sulfydryl-containing substances with a plurality of activated adsorption centers, such as mercaptoacetic acid sodium salt, 2-mercaptobenzothiazole sodium salt and alkyl dimethyl tertiary amines.

Description

technical field [0001] The invention relates to a rust-resistant and protective coating for steel and a preparation method thereof. Background technique [0002] The marine environment and deicing salt can easily cause chlorine salt corrosion to the steel bars in the concrete structure, and the durability and service life of the corroded concrete structure will be greatly reduced. The steel bars in many concrete structures corrode in a short period of time, which not only endangers the safety of structures, but also brings huge economic losses, and even becomes a heavy burden for economic development. Therefore, how to prevent the steel bars in the concrete structure from corroding too quickly or how to make the damaged steel bars in the concrete structure that have been attacked by chloride salts to serve with rust has become the key to maintaining and improving the durability of the concrete structure in harsh environments. The rapid development and application of high-pe...

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Problems solved by technology

[0005] In addition, in recent years, all kinds of large-volume and super high-rise buildings have emerged in an endless stream. In order to meet the functional needs and reduce the temperature stress of concrete, solve the deformation problem of super-long reinforced concrete and the settlement difference between the main body and skirt room of high-rise buildings, it is often used in cast-in-place concrete The post-cast belt construction is introduced into the structure, but the steel bars in the post-cast belt are exposed to the outside for a relatively long period of time (sometimes up to several months), and these steel bars are prone to corrosion; more commonly, many steel bars are stacked for a long time In the open-air environment, these steel bars have been more or less corroded when they are poured in the future, leaving hidden dangers to the concrete structure. Therefore, how to protect the steel bars stored in the open air or used in construction from corrosion is currently a problem that cannot be ignored. important question

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