Preparation And Interface Characterization Of Anti-paint Adhesion Materials

The spray paint mist contains a large amount of volatile organic compounds(VOCs)and paint primers.Due to its high viscosity properties,it easily adheres to the pipe wall or equipment surface during the collection process,causing blockage and affecting the efficiency of paint exhaust gas treatment.The low-adhesion material is a kind of functionalized material with remarkable effect in anti-corrosion,anti-icing,anti-bacterial,anti-frosting and self-cleaning,which has appeared in recent years.If low-adhesion materials are used for transportation and separation of paint mist,the adhesion and concentration of paint mist on the wall surface can be reduced and the operating efficiency of the equipment can be improved.However,there are few reports on the research and application of anti-paint adhesion materials.In response to this problem,this article prepare micro-nano composite structures and smooth low-adhesion materials through surface modification and microstructure construction to explore its anti-paint adhesion properties.Using acrylic acid(AA),butyl acrylate(BA),methyl methacrylate(MMA)and2-methacrylic acid ester(HPMA)as raw materials,a polyacrylate pre-emulsion was first prepared by solution polymerization.Then,the self-made hexamethylol melamine(HMM)was used as a crosslinking curing agent,and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane(PDES)was used as a low surface energy modification molecule to prepare a low adhesion organic coating(Ra=0.863 nm).Through single factor experiments,the best process conditions for hydrophobic and oleophobic properties were determined: HMM content was 3.0 wt%,PDES content was 1.0 wt%.The coating material has good resistance to hot and cold shocks,and has a certain resistance to paint adhesion(surface anti-adhesion ability～30%).The aluminum substrate surface with roughness(Ra=31.5nm)was constructed by one-step etching method and boiling water treatment method.Then the surface was modified with low surface energy 1H,1H,2H,2H-Perfluorodecyltrimethoxysilane(PDES)to obtain an aluminum substrate surface with superamphiphobic properties.Through process optimization,it was found that when the boiling water treatment time was 30 minutes and the PDES reaction time was 60 minutes,the contact angle of the surface of the prepared superamphiphobic aluminum substrate with water was 165°,and the rolling angle was 0°.The contact angle to dodecane was 152° and the rolling angle was 30°.The anti-adhesion ability of acrylic resin paint was greatly improved compared with the above coating materials(surface anti-adhesion ability～60%).Based on the above results,in order to reduce the surface roughness,the surface microstructure control process was optimized,and a rich aluminum hydroxy structure was formed on the aluminum surface by boiling water treatment,while forming a nano-scale rough structure with uniform distribution.On this basis,PDES was used to modify the nano-rough surface,and the 2D and 3D topography of the surface are scanned by scanning electron microscope(SEM)and atomic force microscope(AFM).The results showed that the new surface roughness was Ra =17.2 nm.The low adhesion aluminum surface has a water contact angle and a rolling angle of 145° and 15°,ethylene glycol of 135° and 22°,and dodecane of 40° and 50°,respectively.Adhesion test on acrylic resin paint showed that the prepared low-adhesion aluminum surface had good anti-adhesion effect on paint droplets(surface anti-adhesion ability was more than 95%),indicating that the modified low-adhesion aluminum surface had good self-cleaning ability.