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CN-122010597-A - Super-hydrophobic coating optimized based on mineralization process and spraying process, and preparation method and application thereof

CN122010597ACN 122010597 ACN122010597 ACN 122010597ACN-122010597-A

Abstract

The invention provides a super-hydrophobic coating optimized based on a mineralization process and a spraying process, and a preparation method and application thereof, and belongs to the technical field of building materials and functional coatings. The preparation method of the super-hydrophobic coating comprises the following steps of (1) adding carbide slag and fly ash into deionized water, stirring, introducing CO 2 , mineralizing, filtering and drying after mineralizing to obtain mineralized fly ash particles, (2) adding the mineralized fly ash particles and perfluorodecyl triethoxysilane into ethanol, stirring uniformly, performing ultrasonic treatment to obtain a mixed solution, spraying the obtained mixed solution onto a substrate, and drying to obtain the super-hydrophobic coating. According to the invention, by optimizing mineralization parameters, the surface roughness of the coating is enhanced, and simultaneously, the spraying process is optimized, so that the contact angle of the super-hydrophobic coating can be remarkably improved.

Inventors

  • DUAN MEIDONG
  • GE ZHI
  • WANG LIANG
  • LIU CAIHONG
  • LI CHANGHUI
  • ZHANG HONGZHI
  • ZHANG ZHIHAO
  • LIU JUNXING
  • WANG LIN

Assignees

  • 山东高速股份有限公司
  • 山东大学

Dates

Publication Date
20260512
Application Date
20251230

Claims (10)

  1. 1. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process is characterized by comprising the following steps: (1) Adding carbide slag and fly ash into deionized water, stirring, introducing CO 2 , mineralizing, filtering and drying to obtain mineralized fly ash particles; (2) Adding mineralized fly ash particles and perfluoro decyl triethoxysilane into ethanol, stirring uniformly, performing ultrasonic treatment to obtain a mixed solution, spraying the obtained mixed solution onto a substrate, and drying to obtain the super-hydrophobic coating.
  2. 2. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein the carbide slag in the step (1) comprises the following components, by mass, 88-90 parts of CaO, 2-4 parts of SiO 2 , 3-4 parts of SO 3 , 1-1.5 parts of Al 2 O 3 and 0.2-0.5 part of MgO, and the particle size of the carbide slag is 2-10 mu m, preferably 4 mu m; The fly ash comprises, by mass, 52-56 parts of SiO 2 , 34-36 parts of Al 2 O 3 , 4-5 parts of Fe 2 O 3 , 2-3 parts of CaO and 0.5-1 part of MgO, wherein the particle size of the fly ash is 1-8 mu m, preferably 6 mu m, and the specific surface area of the fly ash is 550-650m 2 /g.
  3. 3. The method for preparing the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein the mass of the carbide slag in the step (1) is 5-15% of the total mass of the carbide slag and the fly ash, and the ratio of the volume of the deionized water to the total mass of the carbide slag and the fly ash is 6-10mL:1g, preferably 8mL:1g.
  4. 4. The method for preparing the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein the stirring temperature in the step (1) is 0-80 ℃, preferably 20 ℃, the stirring is carried out until the pH of the system is unchanged, and the rotating speed in the stirring process is 300-800rpm; The flow rate of CO 2 is 1-2L/min, the mineralization temperature is 0-80 ℃, preferably 20 ℃, CO 2 is introduced to react until the pH value of the system is 6-9, the mineralization is stopped, the stirring speed in the mineralization is 300-800rpm, and the drying is carried out at 100-110 ℃ for 10-15h.
  5. 5. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein the mass ratio of mineralized fly ash particles to ethanol in the step (2) is 1-2 g/10 mL, and the mass ratio of perfluorodecyl triethoxysilane to mineralized fly ash particles is 1:25-50; the stirring speed in the step (2) is 2000-4000rpm, the stirring time is 0.5-1.5h, the power of the ultrasonic wave is 500-2000W, the ultrasonic temperature is 20-30 ℃, the pressure is 0.15-0.4MPa, the ultrasonic wave is carried out in an ultrasonic reactor, and the ultrasonic time is 0.5-1.5h.
  6. 6. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein the spraying condition in the step (2) is that the caliber of a nozzle is 0.3-1mm, the pressure is 0.3-0.8MPa, the spraying distance is 15-30cm, the spraying is performed by adopting fractional spraying, drying is performed for 10-20min at room temperature after each spraying, and the thickness of each spraying is 0.5-1.5mm.
  7. 7. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process is characterized in that a layer of adhesive fluorine modified styrene-acrylic emulsion is sprayed on the substrate in the step (2) before the mixed solution is sprayed, and the specific spraying method comprises the steps of adding the fluorine modified styrene-acrylic emulsion into deionized water to obtain adhesive spraying solution, wherein the mass ratio of the fluorine modified styrene-acrylic emulsion to the deionized water is 8-12:1, spraying the adhesive spraying solution on the surface of the substrate subjected to dust removal treatment, and drying for 5-10min at room temperature, wherein the spraying condition of the adhesive spraying solution is that the caliber of a nozzle is 0.7mm, the air pressure is 0.3-0.6MPa, the spraying distance is 15-30cm, and the thickness is 1-3mm; preferably, the fluorine modified styrene-acrylic emulsion is prepared by adding perfluoro decyl triethoxysilane into the styrene-acrylic emulsion, and stirring uniformly to obtain the fluorine modified styrene-acrylic emulsion, wherein the mass ratio of perfluoro decyl triethoxysilane to the styrene-acrylic emulsion is 2-5:100.
  8. 8. The preparation method of the super-hydrophobic coating optimized based on the mineralization process and the spraying process according to claim 1, wherein in the step (2), the drying is performed at room temperature for 20-30 hours, the base material is a dedusted mortar or concrete base material, and the thickness of the super-hydrophobic coating is 1-10mm.
  9. 9. A superhydrophobic coating prepared by the method of any one of claims 1-8.
  10. 10. The use of the superhydrophobic coating of claim 9 in the preparation of superhydrophobic mortar or concrete.

Description

Super-hydrophobic coating optimized based on mineralization process and spraying process, and preparation method and application thereof Technical Field The invention belongs to the technical field of building materials and functional coatings, and particularly relates to a super-hydrophobic coating optimized based on a mineralization process and a spraying process, and a preparation method and application thereof. Background Concrete is used as the most commonly used structural material and widely applied to various infrastructures, but the concrete is exposed to the external environment for a long time and is easy to be permeated by external moisture and aggressive ions, so that the problems of corrosion, sulfate corrosion, freeze thawing damage and the like of the steel bar are caused, and the durability and the service life are seriously influenced. In this context, superhydrophobic coatings are effective means for improving durability of concrete due to their excellent water resistance. A superhydrophobic surface refers to a surface on which a water droplet has a contact angle of greater than 150 ° and a roll angle of less than 10 °. The lotus leaf surface in the nature shows super-hydrophobic property, which stimulates the research interest of the bionic coating. On the one hand, a waxy layer with lower surface energy exists on the surface of the lotus leaf, and on the other hand, a very complex micro-nano structure exists on the surface of the lotus leaf. The coating is constructed to form a protective layer on the surface of the concrete structure, prevent water from entering and harmful ions from entering, effectively reduce damage to the concrete caused by freeze thawing cycle, chloride ion corrosion and the like, and improve the durability of the concrete. The fly ash is a large amount of industrial solid waste discharged by coal-fired power plants, has lower activity and most of the fly ash is spherical, and the carbide slag is high-alkalinity waste slag generated in the acetylene production process, contains rich active CaO and has higher CO 2 mineralization capability. The preparation of the lotus leaf-like surface requires proper micro-nano structure and low surface energy substances, so that the preparation of the fly ash super-hydrophobic coating by optimizing a mineralization process and a spraying process by taking fly ash and carbide slag as raw materials has important significance. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a super-hydrophobic coating optimized based on a mineralization process and a spraying process, and a preparation method and application thereof. According to the invention, by optimizing mineralization parameters, the surface roughness of the coating is enhanced, and simultaneously optimizing the spraying process, the contact angle of the coating can be obviously improved, so that the superhydrophobic coating is obtained. The technical scheme of the invention is as follows: a preparation method of a super-hydrophobic coating optimized based on a mineralization process and a spraying process comprises the following steps: (1) Adding carbide slag and fly ash into deionized water, stirring, introducing CO 2, mineralizing, filtering and drying to obtain mineralized fly ash particles; (2) Adding mineralized fly ash particles and perfluoro decyl triethoxysilane into ethanol, stirring uniformly, performing ultrasonic treatment to obtain a mixed solution, spraying the obtained mixed solution onto a substrate, and drying to obtain the super-hydrophobic coating. According to the invention, the carbide slag in the step (1) comprises, by mass, 88-90 parts of CaO, 2-4 parts of SiO 2, 3-4 parts of SO 3, 1-1.5 parts of Al 2O3 and 0.2-0.5 part of MgO, wherein the grain size of the carbide slag is 2-10 mu m, and more preferably 4 mu m. According to the invention, the fly ash in the step (1) comprises, by mass, from 52 to 56 parts of SiO 2, from 34 to 36 parts of Al 2O3, from 4 to 5 parts of Fe 2O3, from 2 to 3 parts of CaO and from 0.5 to 1 part of MgO, wherein the particle size of the fly ash is from 1 to 8 mu m, more preferably from 6 mu m, and the specific surface area of the fly ash is from 550 to 650m 2/g. According to the invention, the mass of the carbide slag in the step (1) is 5-15% of the total mass of the carbide slag and the fly ash, and the control of the mass of the carbide slag in the above range can prevent the calcium carbonate from coating the fly ash to be too sparse or too dense and reduce the roughness. According to the invention, the ratio of the volume of deionized water to the total mass of carbide slag and fly ash in the step (1) is preferably 6-10 mL/1 g, more preferably 8 mL/1 g. According to the invention, the stirring temperature in step (1) is preferably 0-80 ℃, more preferably 20 ℃, and the stirring is carried out until the pH of the system is unchanged, and the rotating speed during stirring is 300-800rpm. A