Corrosion inhibitor gel microsphere with intelligent pH value controlled release function and its preparation method and use

Abstract

The invention discloses a corrosion inhibitor gel microsphere with an intelligent pH value controlled release function and its preparation method and use. A polyelectrolyte with a fast environment pH value response rate is used as a coating material and through one-step polymerization, the corrosion inhibitor gel microsphere with an environment pH controlled release function is prepared. The preparation method comprises that acrylic acid (or methacrylic acid), acrylamide (or methacrylamide) and N-N-methylene bisacrylamide (MBA) as raw materials undergo a solution deposition polymerization reaction to produce the corrosion inhibitor gel microsphere with an environment pH controlled release function. The corrosion inhibitor gel microsphere has submicron particle size, structured morphology, smooth surface, even size, good monodispersity, high drug loading amount and a fast environment pH change response rate. The corrosion inhibitor gel microsphere has wide application prospects in the fields of a corrosion system with large system pH fluctuation, self-repairing anticorrosion coating preparation and concrete reinforcement corrosion protection.

Description

Technical field: [0001] The invention relates to a fluid corrosion system with large fluctuations in the pH value of the system, an intelligent control release technology for corrosion inhibitors in systems such as the preparation of self-repairing anti-corrosion coatings, and the corrosion protection of concrete steel bars, and in particular to a slow release system with intelligent pH value control release. Corrosive gel microspheres and their preparation methods and applications. Background technique: [0002] Corrosion of metals in the service environment is the main cause of performance degradation or even premature failure of engineering structures or functional materials. Corrosion of metals can not only cause significant economic losses, but also be related to issues such as personal safety, effective use of resources, and environmental protection, and even bring adverse effects to society. According to statistics, the annual economic losses caused by corrosion in v...

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Problems solved by technology

[0003] However, due to the complex and changeable service environment of metal structures and functional materials, and the continuous improvement of modern engineering structures for corrosion protection technology, the problems of conventional corrosion inhibitors have become more and more apparent, and their application has also been severely challenged:( 1) For corrosion inhibitors used in conventional corrosive fluid media, due to changes in medium characteristics (components, pH value, temperature, flow rate, etc.), the corrosion inhibitors will be deactivated, hydrolyzed and degraded in the service environment. It is mostly used in one-time or continuous dosing methods. For a long time, there have been problems such as short life cycle, poor stability, low utilization rate, concentration "peak-valley" during use, and corrosion inhibition performance.

(2) Under some special corrosive environment conditions, such as metal protective coatings, steel reinforcement protection in concrete and other corrosion systems, because conventional corrosion inhibitors themselves do not have environmental adaptability, it is impossible to control the metal / environment interface characteristics during the corrosion process Changes (such as pH value, etc.) to make timely and rapid response, so its corrosion inhibition effect is obviously lack of timeliness and pertinence

However, with the carbonization of concrete and aggressive ions (such as Cl - ) invasion will lead to a decrease in the pH value of the steel / concrete interface, destroying the microscopic passive environment around the steel bar, and then inducing the corrosion of the steel bar

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