Super-oleophobic and lyophobic coating and preparation method thereof

Abstract

The invention relates to a super-oleophobic and lyophobic coating and a preparation method thereof. The coating is manufactured by three nanometer layers, wherein the first nanometer layer consists of pyrocatechol derivatives; the second nanometer layer consists of metal ions or metal coordination compounds; and the third nanometer layer consists of surface active agents. The preparation method comprises the following steps of respectively preparing the pyrocatechol derivatives, the metal ions or the metal coordination compounds and the surface active agents into liquor with the concentration of 0.01-5wt%, liquor with the concentration of 50-70mM and liquor with the concentration of 0.01-5wt%; sequentially soaking a base material into the three types of liquor; and performing self-assembly of the nanometer layers to obtain the super-oleophobic and lyophobic coating. The super-oleophobic and lyophobic coating can be used in oiliness places without limitation, can be well adhered to polytetrafluoroethylene and can withstand a severe environment with pH of 1-12 for a long time. The preparation method is simple in process and low in cost, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a super-oleophobic and hydrophobic coating and a processing method thereof. Background technique [0002] At present, superhydrophobic coatings are mostly grafted or blended with fluoride or nanostructured polymers. These super-hydrophobic coatings generally cannot be oleophobic, and they do not have a coating, so they cannot be used in many fields. This year, it was reported that 500nm TiO 2 Nanoparticles then self-assemble nanolayers to achieve a superhydrophobic surface, but this application is greatly limited, the main limitations are (1) can not be oleophobic; (2) can only be used for nanoparticles; (3) long-term use The effect is reduced; (4) surface fluorination treatment, using expensive perfluoromercaptan treatment; (5) polluted and difficult to regenerate. So these are unfavorable factors for industrial applications. [0003] There is also an electrospinning blend to obtain ...

AI Technical Summary

Problems solved by technology

Obviously, excellent super-oleophobic and hydrophobic properties can be obtained using this technology, but there are the following disadvantages: (1) due to the use of oligomeric silsesquioxanes containing perfluorinated branched chains, this material has not been industrialized so far Mass production is completely synthesized by the laboratory itself, so the production cost is extremely high; (2) Due to the use of electrospinning blending, many substances cannot be used, such as PTFE

[0004] Industrial applications are mostly simple steps such as adding fluorosurfactant for soaking and drying, but there are the following limitations: (1) It has strong selectivity for the substrate and must have chemical reactive groups; (2) and also It can only be hydrophobic but difficult to be oleophobic, and its durability is very poor; (3) Not resistant to strong acid, strong alkali and strong oxidation

As a result, industrial applications are restricted. So far, strong oleophobic, low-cost and non-selective coatings are still a worldwide problem.

Images