Construction And Properties Of Colorful Superhydrophobic Coatings On Wood Surface

The lignin,cellulose and hemicellulose in wood all contain a large number of hydrophilic groups,and the porous structure of the wood itself makes the wood easy to absorb water and moisture,resulting in defects such as deformation,mildew,decay and discoloration.In this paper,a color superhydrophobic coating is prepared,which has the advantages of excellent corrosion resistance,abrasion resistance,high temperature and antifreeze resistance,and anti-ultraviolet aging,which can make wood have stable color and superhydrophobicity.Colored super-hydrophobic wood presents colorful colors and can be widely used in handicrafts,architecture,kitchen and bathroom furniture,advertising signs and other fields,and has a very good decorative effect.At present,there are many methods for constructing superhydrophobic coatings on wood surfaces,but these methods involve the use of a large amount of organic solvents and fluorine-containing compounds,causing environmental problems.With the world’s new requirements for environmentally friendly green coatings,reducing harmful organic solvents and toxic fluorine The use of chemical compounds is an inevitable trend for the preparation of superhydrophobic coatings in the future.In this paper,wood is used as substrate,water is used as solvent,and metal oxides are used as color particles to construct a rough surface.Environmentally friendly adhesive polydimethylsiloxane(PDMS)is introduced as low surface modifier,and the three are prepared by blending.A colored superhydrophobic coating is obtained,and the coating is applied to the surface of the wood to construct a colored superhydrophobic coating.The main conclusions are as follows:(1)The hydrophobic properties of wood surfaces treated with metal oxides and PDMS were investigated.Different metal oxides can endow wood with corresponding colors.The contact angle of water droplets on the wood surface is increased from the initial 28.7° to more than 150°,and the highest is 162.0°.The rolling angle is 2°,which has good superhydrophobicity.Scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)were used to analyze the microscopic morphology and chemical composition of the colored superhydrophobic coating on the wood surface.The results showed that the hydrophobic metal oxide particles modified by PDMS were uniformly distributed on the wood surface.A two-dimensional micronano superhydrophobic structure was constructed.(2)The preparation process of color superhydrophobic coating on wood surface was explored.The amount of PDMS added had the most significant effect on the hydrophobic properties of the treated wood surface,and the type of metal oxide had the most significant effect on the color of the treated wood surface.When the solvent water was 50 mL,the addition amount of PDMS was 5 g,and the metal oxide was 0.5 g,a colored superhydrophobic coating with the best hydrophobic properties could be obtained on the wood cross-section.The self-cleaning test and color difference analysis of wood surface coatings show that the coatings have good self-cleaning properties,and wood surface coatings treated with different metal oxides show different lightness(L*)values,red and green axis colors The chromaticity index(a*)value and the yellow-blue axis chromaticity index(b*)value.(3)To explore the color regulation of color superhydrophobic coatings on wood surfaces.By changing the ratio between the two metal oxides,colored superhydrophobic woods with different color gradients were prepared.The microscopic morphology and chemical composition of the colored superhydrophobic coating on the wood surface were analyzed by SEM,FTIR infrared spectroscopy,and X-ray photoelectron spectroscopy(XPS).The results showed that the composite metal oxide particles modified by PDMS were uniformly distributed on the wood surface.Twodimensional micro-nano superhydrophobic structure.The self-cleaning test and color difference analysis of the wood surface coating show that the coating has good selfcleaning performance,and the superhydrophobic wood will show different L*,a*,b*values due to the change of the metal oxide ratio,to realize the regulation of the color gradient of the colored superhydrophobic wood surface.(4)To study the mechanical stability,chemical stability,thermal stability and antiultraviolet aging ability of the colored superhydrophobic coating on the wood surface.By simulating common damage forms in life,such as hand rubbing,acid rain,high heat,ultraviolet light irradiation,etc.,it is expected to comprehensively evaluate the application of colored superhydrophobic wood in real life.Under the high pressure of 20000 Pa,the colored superhydrophobic wood remained superhydrophobic even after the surface of 800-grit sandpaper was worn for 105 cm,indicating that it has good mechanical stability.The colored superhydrophobic wood still has good superhydrophobic properties and no change in color after being placed in an aqueous solution of pH=1-12 for 30 min,indicating that it has good chemical stability.After the colored superhydrophobic wood was placed at 120℃ and 0℃ for 2 h,the contact angle remained above 150°,indicating that it has good thermal stability.At the same time,the dust pollutants on the surface of the colored superhydrophobic wood can be taken away by water droplets,indicating that it has good self-cleaning and antifouling performance.The above properties improve the application value of wood in the fields of handicrafts,wooden decorations,outdoor courtyards,architecture,interior decoration,etc.,and have broad application prospects.