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CN-121974405-A - Ferroferric oxide@silicon dioxide magnetic composite nano particle for loading rust inhibitor, preparation method thereof and product containing ferroferric oxide@silicon dioxide magnetic composite nano particle

CN121974405ACN 121974405 ACN121974405 ACN 121974405ACN-121974405-A

Abstract

The invention discloses a ferroferric oxide@silicon dioxide magnetic composite nano particle for loading a rust inhibitor, a preparation method thereof and a product containing the same, belonging to the technical field of reinforced concrete rust prevention, the invention takes Triton X-100 as a surfactant, cyclohexane as an oil phase, and an inverse microemulsion system formed by mixing n-hexylalcohol and water as a carrier, the Fe 3 O 4 @SiO 2 composite nano particle with the core-shell structure is prepared by a two-step method, and a rust inhibitor is loaded on the Fe 3 O 4 @SiO 2 magnetic composite nano particle by a dipping method to prepare the composite material for rust prevention of reinforced concrete. The composite material can transfer the antirust agent from the concrete surface layer to the steel bar surface layer so as to achieve the protection effect on the steel bar, and solves the problems that the existing electrochemical repair technology can remove chloride ions and repair the corroded steel bar, but has limited rust resistance, more consumption and easy damage to the inside of the concrete and can not be used repeatedly.

Inventors

  • PAN CHONGGEN
  • CHEN YEDONG
  • WANG PENGGANG
  • ZHOU XUGUANG
  • DUAN YOUPENG
  • LIAN YANJIN
  • LIU XINKE
  • MENG XIANGKUN

Assignees

  • 浙大宁波理工学院

Dates

Publication Date
20260505
Application Date
20260205

Claims (10)

  1. 1. The preparation method of the Fe 3 O 4 @SiO 2 magnetic composite nano particle is characterized by comprising the following steps: the Fe 3 O 4 @SiO 2 magnetic composite nano particle is prepared by using cyclohexane as an oil phase, ferric salt solution as an aqueous phase, tetraethoxysilane as a silicon source and Triton X-100 as a surfactant through an inverse microemulsion method.
  2. 2. The method for preparing the Fe 3 O 4 @SiO 2 magnetic composite nanoparticle according to claim 1, wherein the ferric salt solution is a mixed solution obtained by dissolving FeCl 3 ·6H 2 O and FeCl 2 ·4H 2 O in water; wherein the dosage ratio of FeCl 3 ·6H 2 O、FeCl 2 ·4H 2 O to water is 2.0-4.0 g:1-5 g:60-100 mL.
  3. 3. The method for preparing the Fe 3 O 4 @SiO 2 magnetic composite nanoparticle according to claim 1, wherein the method comprises the following steps: (1) Dropwise adding ammonia water into the ferric salt solution, heating, and reacting to generate Fe 3 O 4 colloid under the action of citric acid serving as a stabilizer; (2) Adding a solution prepared by mixing Fe 3 O 4 colloid serving as a water phase and cyclohexane serving as an oil phase and Triton X-100 serving as a surfactant into the solution to form inverse microemulsion; (3) And then dropwise adding ammonia water, dropwise adding ethyl orthosilicate when the pH value of the solution is regulated to 8-9, mechanically stirring, centrifuging and washing to finally obtain the Fe 3 O 4 @SiO 2 magnetic nano particles.
  4. 4. A method for producing Fe 3 O 4 @SiO 2 magnetic composite nanoparticles according to claim 3, wherein in step (1), the heating temperature is 60-100 ℃.
  5. 5. The method for preparing the Fe 3 O 4 @SiO 2 magnetic composite nano-particles according to claim 3, wherein the volume ratio of the Fe 3 O 4 colloid to the cyclohexane to the Triton X-100 to the ethyl orthosilicate is 1-3:20-40:6-10:0.5-2.
  6. 6. A Fe 3 O 4 @SiO 2 magnetic composite nanoparticle prepared by the method of any one of claims 1-5; The Fe 3 O 4 @SiO 2 magnetic composite nano particle is of a core-shell structure, and takes ferroferric oxide as a core and silicon dioxide as a shell.
  7. 7. A composite material for rust prevention of reinforced concrete, comprising the Fe 3 O 4 @SiO 2 magnetic composite nanoparticle of claim 6 and a rust inhibitor, wherein the rust inhibitor is supported on the Fe 3 O 4 @SiO 2 magnetic composite nanoparticle.
  8. 8. The composite material for rust prevention of reinforced concrete according to claim 7, wherein the rust inhibitor is undecyl hydroxyethyl imidazoline quaternary ammonium salt.
  9. 9. The preparation method of the composite material for rust prevention of reinforced concrete is characterized by comprising the following steps of: The composite material for rust prevention of reinforced concrete according to claim 7 or 8 is prepared by loading a rust inhibitor on Fe 3 O 4 @SiO 2 magnetic composite nano particles by a dipping method.
  10. 10. The method for preparing the reinforced concrete antirust composite material according to claim 9, wherein the preparation method comprises the following steps: dissolving a rust inhibitor in acetone, and mechanically stirring to form a mixed solution; adding Fe 3 O 4 @SiO 2 magnetic composite nano particles into the mixed solution, mechanically stirring at normal temperature, and sequentially centrifuging, washing and drying to obtain the composite material for rust prevention of reinforced concrete; Wherein the mass ratio of the rust inhibitor to the Fe 3 O 4 @SiO 2 magnetic composite nano particles is 1-3:0.8-2.

Description

Ferroferric oxide@silicon dioxide magnetic composite nano particle for loading rust inhibitor, preparation method thereof and product containing ferroferric oxide@silicon dioxide magnetic composite nano particle Technical Field The invention belongs to the technical field of reinforced concrete rust prevention, and particularly relates to ferroferric oxide and silicon dioxide magnetic composite nano particles for loading a rust inhibitor, a preparation method thereof and a product containing the ferroferric oxide and silicon dioxide magnetic composite nano particles. Background Reinforced concrete is a building material with the largest use amount in the world at present. Generally, in the service life, the reinforced concrete structure is high in structural strength and excellent in performance, but due to the effects of various reasons such as unreasonable design, improper material selection, incapability of guaranteeing construction quality, severe external environment and the like, the reinforced concrete structure is damaged, so that the durability of the reinforced concrete structure is reduced and the service life of the reinforced concrete structure is shortened. Generally, steel bar corrosion, freeze thawing, environmental corrosion, etc. are important factors causing concrete destruction. And steel reinforcement rust is one of the most important factors causing the destruction of the reinforced concrete structure. This will severely affect the service life of the reinforced concrete structure, resulting in significant engineering damage and economic loss. The current common reinforcement corrosion protection technology is electrochemical protection technology. The electrochemical repair can remove chloride in the steel bar to repair the steel bar, but the local softening of the reinforced concrete joint surface exists, and hydrogen precipitation occurs on the surface of the steel bar, so that the damage of the steel bar is aggravated. Furthermore, after electrochemical repair, corrosion problems still occur for subsequent re-invasion by aggressive chlorine salts. One suitable method is to move the removable rust inhibitor from the cement surface to the steel reinforcement surface, thereby protecting the steel reinforcement. However, when the rust inhibitor is used, the rust inhibitor is in migration, the rust inhibitor can be reversely diffused into the atmosphere, the content of the rust inhibitor in the solution is reduced, the natural migration speed of the rust inhibitor is slowed down, the content of the rust inhibitor in concrete is reduced, the rust inhibition effect is reduced, the migration type rust inhibitor is only suitable for corrosion protection of the existing building, but not suitable for the newly built building, the long-time electrification can cause adverse effect on the cement property, the electrochemical repair technology cost is high, the use condition is severe, and the application field of the electrochemical repair technology is further restricted. Therefore, research and development of a Fe 3O4@SiO2 nano particle supported rust inhibitor composite material which can pass electromigration and has high rust resistance and a preparation method thereof are needed. Disclosure of Invention Aiming at the technical problems, the invention provides a ferroferric oxide and silicon dioxide magnetic composite nanoparticle for loading a rust inhibitor, a preparation method thereof and a product containing the ferroferric oxide and silicon dioxide magnetic composite nanoparticle. In order to achieve the above purpose, the present invention provides the following technical solutions: one of the technical schemes of the invention is as follows: A preparation method (two-step method) of Fe 3O4@SiO2 magnetic composite nano particles comprises the following steps: the Fe 3O4@SiO2 magnetic composite nano particle is prepared by using cyclohexane as an oil phase, ferric salt solution as an aqueous phase, tetraethoxysilane as a silicon source and Triton X-100 as a surfactant through an inverse microemulsion method. Optionally, the ferric salt solution is prepared by dissolving FeCl 3·6H2 O and FeCl 2·4H2 O in water; wherein the dosage ratio of FeCl 3·6H2O、FeCl2·4H2 O to water is 2.0-4.0 g:1-5 g:60-100 mL. Further, the water is oxygen-free water. Optionally, the preparation method comprises the following steps: (1) Dropwise adding ammonia water into the ferric salt solution, heating, and reacting to generate Fe 3O4 colloid under the action of citric acid serving as a stabilizer; (2) Adding a solution prepared by mixing Fe 3O4 colloid serving as a water phase and cyclohexane serving as an oil phase and Triton X-100 serving as a surfactant into the solution to form inverse microemulsion; (3) And then dropwise adding ammonia water to adjust the pH of the solution to 8-9, dropwise adding tetraethoxysilane, mechanically stirring, and finally centrifuging and washing to obtain the Fe 3O4@SiO2 mag