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CN-122011938-A - High-durability transparent super-oleophobic coating and preparation method thereof

CN122011938ACN 122011938 ACN122011938 ACN 122011938ACN-122011938-A

Abstract

The invention discloses a high-durability transparent super-oleophobic coating and a preparation method thereof, the preparation method comprises the steps of firstly mixing ethanol and isopropanol in proportion to form a mixed solvent, then adding fumed silica, alumina, titanium dioxide and zirconium oxide nano particles into the mixed solvent, and stirring and dispersing the mixture to construct a uniform and stable inorganic particle dispersion system; then adding PFOTS, TEOS and NH 3 ·H 2 O into the dispersion liquid, carrying out hydrolytic condensation reaction under stirring to realize surface modification of inorganic particles, then preparing silane sol primer, sequentially spraying the silane sol primer and the modified suspension liquid on the surface of a carrier, and finally drying to form a coating with high transparency and excellent superoleophobic performance.

Inventors

  • YANG JIN
  • ZHAO LIXUAN
  • Xu Dengkai
  • ZHANG QIANLIN
  • JIA XIAOHUA
  • SONG HAOJIE

Assignees

  • 陕西科技大学

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The preparation method of the high-durability transparent super-oleophobic coating is characterized by comprising the following steps of: Firstly, mixing 10-15 mL of ethanol with 10-15 mL of isopropanol to obtain a uniform mixed solvent, then adding 0.10-0.15 g of fumed silica, 0.05-0.10 g of alumina, 0.01-0.05 g of titanium dioxide and 0.01-0.05 g of zirconium oxide into the mixture, and stirring to form a uniform dispersion; Sequentially adding 0.1-1% of perfluorooctyl trichlorosilane, 0.1% of tetraethyl orthosilicate and 20% of ammonia water into the dispersion liquid prepared in the first step, and stirring to form a uniform suspension liquid; Dissolving 2.5-10 g of tetraethoxysilane and 0.5 g aminopropyl triethoxysilane in 45 mL ethanol, adding 5mL deionized water and 1 mL ammonia water, stirring at room temperature for 1-6 h, standing and aging for 6-24 h to form uniform and stable silane sol primer; And fourthly, spraying 1-5 layers of silane sol-type primer obtained in the third step on the surface of the carrier by adopting a spray gun, drying, spraying 1-20 layers of suspension obtained in the second step, and drying after spraying is finished to form the super-oleophobic functional layer.
  2. 2. The method for preparing a high-durability transparent super-oleophobic coating according to claim 1, wherein the mass concentration of the ammonia water in the first step and the second step is 25 wt%.
  3. 3. The method for preparing the high-durability transparent super-oleophobic coating according to claim 1, wherein the stirring duration in the first step and the second step is 10-12 hours.
  4. 4. The method of claim 1, wherein the carrier in step four comprises transparent glass, quartz or ceramic.
  5. 5. The method for preparing the high-durability transparent super-oleophobic coating according to claim 1 or 4, wherein the carrier is placed in ethanol for ultrasonic cleaning for 10-20 min before spraying the silane sol-type primer, then is respectively washed three times by ethanol and deionized water, and is dried by nitrogen after the washing is completed.
  6. 6. The method for preparing the high-durability transparent super-oleophobic coating according to claim 1, wherein the suspension obtained in the second step and the silane sol-type primer obtained in the third step are respectively subjected to ultrasonic treatment for 10-30 min before being sprayed in the fourth step.
  7. 7. The method for preparing a high-durability transparent super-oleophobic coating according to claim 1, wherein the pressure of a spray gun in the spraying process in the fourth step is 0.05-0.5 MPa, and the spray gun and a carrier keep a vertical distance of 10-30 cm and move at a horizontal speed of 2 cm/s.
  8. 8. The method for preparing the high-durability transparent super-oleophobic coating according to claim 1, wherein nitrogen auxiliary atomization spraying is adopted in spraying the silane sol-type primer and the super-oleophobic functional layer in the fourth step.
  9. 9. The method for preparing the high-durability transparent super-oleophobic coating according to claim 1, wherein the drying in the fourth step is standing and drying in air for about 30min min or adopting hot air for auxiliary drying for 5-10 min.
  10. 10. A high durability transparent superoleophobic coating prepared according to the method of any of claims 1 to 9.

Description

High-durability transparent super-oleophobic coating and preparation method thereof Technical Field The invention belongs to the technical field of functional materials, relates to super-oleophobic coating equipment, and in particular relates to a transparent high-durability super-oleophobic coating and a preparation method thereof. Background The super-oleophobic surface has important application value in the fields of antifouling self-cleaning, anti-fingerprint, optical device protection, oil-water separation, micro-fluidic chip, high-end display device surface pollution prevention and the like because of the high contact angle and low adhesive force of the super-oleophobic surface to low surface tension liquid. However, the construction of superoleophobic coatings still faces significant technical challenges compared to the mature superhydrophobic technology. The root cause is that the surface tension of oil liquids is generally low, and effective repulsion is difficult to achieve by traditional coarse structures combined with hydrophobic groups, so super oleophobic coatings generally require lower surface energy surface chemical modifications and finer micro-nanostructure construction. The existing super oleophobic coating mainly depends on two strategies, namely (1) reducing the surface free energy by introducing low-surface energy materials such as perfluoroalkyl silane, fluoropolymer and the like, and (2) constructing a micro-nano coarse structure by utilizing silicon dioxide, titanium oxide, carbon-based nano materials and the like to form a reentrant structure so as to support oil drops. However, the existing method still has the following defects that firstly, part of the preparation method relies on complicated chemical vapor deposition or plasma treatment, the equipment cost is high, the process condition is harsh, large-area popularization is not facilitated, secondly, a plurality of coatings are often sacrificed in transparency when the super-oleophobic characteristic is maintained, the optical transmittance is difficult to consider, the application of the coating in the fields of optical devices and display is limited, thirdly, the mechanical stability of the part of the coatings is insufficient, the super-oleophobic performance is easy to lose after cleaning or slight friction, fourthly, the surface modification is uneven or the thickness of the coatings is difficult to regulate, and the repeatability and the scalability of the application are also affected. In order to solve the above problems, researchers have recently begun to adopt a low-cost, large-area preparation process route such as sol-gel method, spray method, etc., by dispersing nanoparticles in a mixed solvent and performing surface chemical modification in combination with a silane coupling agent, to obtain a composite coating layer having both transparency, low surface energy and surface microstructure. However, the problems of particle agglomeration, poor coating uniformity, insufficient reaction and the like in the traditional sol-gel system still exist, so that the transparency and super-oleophobic performance of the coating are unstable. Based on the above, there is a need for a super oleophobic interface material that can not only maintain good optical performance, but also effectively repel various low surface tension, so as to meet the application requirements in the fields of optical devices, precise instruments, oil stain easy-to-attach surface protection, and the like. Disclosure of Invention The invention aims to provide a high-durability transparent super-oleophobic coating and a preparation method thereof, wherein the coating has the advantages of simple process, uniform film formation, high transparency and stable super-oleophobic and self-cleaning properties. The invention is realized by the following technical scheme: a preparation method of a high-durability transparent super-oleophobic coating comprises the following steps: Firstly, mixing 10-15 mL of ethanol with 10-15 mL of isopropanol to obtain a uniform mixed solvent, then adding 0.10-0.15 g of fumed silica, 0.05-0.10 g of alumina, 0.01-0.05 g of titanium dioxide and 0.01-0.05 g of zirconium oxide into the mixture, and stirring to form a uniform dispersion; Sequentially adding 0.1-1% of perfluorooctyl trichlorosilane, 0.1% of tetraethyl orthosilicate and 20% of ammonia water into the dispersion liquid prepared in the first step, and stirring to form a uniform suspension liquid; Dissolving 2.5-10 g of tetraethoxysilane and 0.5 g aminopropyl triethoxysilane in 45 mL ethanol, adding 5mL deionized water and 1 mL ammonia water, stirring at room temperature for 1-6 h, standing and aging for 6-24 h to form uniform and stable silane sol primer; And fourthly, spraying 1-5 layers of silane sol-type primer obtained in the third step on the surface of the carrier by adopting a spray gun, drying, spraying 1-20 layers of suspension obtained in the second step, and dryi