Aminoketose organic steel bar corrosion inhibitor and preparation method thereof

Abstract

The invention discloses an aminoketose organic steel bar corrosion inhibitor. The aminoketose organic steel bar corrosion inhibitor is prepared by carrying out Amadori rearrangement reaction on aldoses and amines. The aldoses comprise glucose, galactose and mannitose, and have the advantages of wide sources and environment friendliness; and the amines are disclosed in the specification, wherein R1 and R2 are independently selected from C1-C15 straight-chain, branched-chain, cyclic alkyl, aralkyl, aryl, alkenyl, ether alkyl, amino alkyl, alkyl alcohol, alkylamine, alkyl carboxylic acid or hydrogen atom; R1 and R2 can form a ring; and R1 and R2 can not be the hydrogen atom at the same time. The synthesis technique is simple. The prepared corrosion inhibitor has the characteristics of high corrosion inhibition efficiency and environment friendliness, and has obvious application value and broad market prospects.

Description

technical field [0001] The invention relates to an aminoketose sugar organic steel bar rust inhibitor and a preparation method thereof, belonging to the field of building materials. [0002] technical background [0003] Reinforced concrete is currently the most widely used building material. Among the many factors affecting the durability of concrete, steel corrosion is the primary cause of structural deterioration and failure. Under normal circumstances, the strong alkaline environment formed by the hydration of cement forms a dense passivation film on the surface of the steel bars embedded in it, and there will be no corrosion. However, as the service time of the concrete structure increases, the internal alkalinity becomes lower. At the same time, under the combined action of chloride ion infiltration, water and oxygen, the passivation film is gradually destroyed, and the corrosion degree is gradually intensified. Due to the volume expansion of the generated rust, common...

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Problems solved by technology

However, studies have shown that alcohol amines cannot increase the critical chloride ion concentration, that is, they cannot delay the occurrence of corrosion (Materials and Corrosion, 2010, 61, 802-809.), and cannot slow down the corrosion rate when used on corroded steel bars (Cement and Concrete Research, 2007, 37, 972-977.)

In addition, this kind of rust inhibitor can only show the ideal effect when the dosage is relatively high, and the cost is relatively high. At the same time, it is rarely used alone, and it is often compounded with other components.

For example, the patent CN101007717A describes a steel rust inhibitor composed of an aqueous solution of alcohol amine and acid, which may lead to a decrease in the alkalinity of the concrete, thereby causing accelerated dissolution of the passivation film

A kind of alcohol amine rust inhibitor described in CN103241980A has added benzotriazole with higher price, and the application cost is high

[0007] However, there are few reports on the preparation of rust inhibitors by structural modification of sugars. The known examples in the literature are pentaerythritol glycoside rust inhibitors synthesized from glucose, which can resist the corrosion of chloride ions by chemical adsorption on the surface of steel bars (Corrosion Science , 2012,54,193-200; Chinese Journal of Corrosion and Protection, 2014,34,125-130; CN103880316A), but the synthesis of this molecule requires a high temperature above 100°C, a large amount of organic solvents are required, and the post-treatment is cumbersome, which is not conducive to large-scale production

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