Sugar amine organic steel rust inhibitor and preparation method thereof

Abstract

The invention discloses an osamine organic rebar corrosion inhibitor, which is prepared from hemiacetal hydroxyl containing sugar and amine through condensation, wherein the sugar contains hydroxyl protected or unprotected monosaccharides and disaccharides, and is wide in sources, green and environmentally friendly; and the amine is shown in a formula:, wherein R1 and R2 are independently selected from a linear chain containing 1-15 carbons, a branched chain, ring alkyl, aralkyl, aryl, alkenyl, ether alkyl, amino alkyl, alkyl alcohol, alkylamine, an alkyl carboxylic acid or a hydrogen atom, can be cyclized, and can not be a hydrogen atom simultaneously. According to the invention, a synthesis process is simple, and a prepared corrosion inhibitor has the characteristics of efficient corrosion inhibition, green and environmental friendliness, and has a significant application value and a broad market prospect.

Description

technical field [0001] The invention relates to a sugar amine organic steel bar rust inhibitor and a preparation method thereof, belonging to the field of building materials. technical background [0002] Reinforced concrete is the most widely used building material at present. The long life and high durability of concrete are still a major problem that has not been overcome. Among the many factors affecting the durability of concrete, the corrosion of steel bars is considered to be the primary reason. 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, with the increase of the service time of the concrete structure, the internal alkalinity becomes lower, and at the same time, under the joint action of harmful ions such as chloride ions and water and oxygen, the passivation film is gradually destroyed and corrosion...

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Problems solved by technology

However, studies have shown that dimethylethanolamine cannot increase the critical chloride ion concentration, that is, it cannot delay the occurrence of corrosion (Materials and Corrosion, 2010, 61, 802-809.), and alcohol amine rust inhibitors are used on corroded steel bars It has also been proved to be ineffective (Cement and ConcreteResearch, 2007, 37, 972-977.), and the antirust effect of amine compounds is not ideal (Corrosion Science, 2009, 51, 2959-2968.)

In addition, this kind of rust inhibitor is often used in a large amount, the cost is high, and 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

[0008] Previously, there were few reports on sugars bonded with other molecules to build rust inhibitors. The pentaerythritol glycoside of glucose is an example, which can resist the erosion of chloride ions by chemical adsorption on the surface of steel bars (Corrosion Science, 2012, 54, 193-200; Chinese Corrosion and Chinese Journal of Protection, 2014, 34, 125-130; CN103880316A), but the synthesis of this molecule requires a high temperature above 100°C and the addition of an acidic catalyst, which may cause corrosion of the reactor, which is not conducive to large-scale production

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