Preparation Of Long-term Anti Oil Coating And Its Performance

During the long-term use of mechanical equipment and components,the surface often faces problems such as easy adhesion of high-viscosity oil,which affects the appearance of the surface and operation efficiency,making the cleaning process frequent and difficult.However,the current protective coating on the surface of the component is difficult to protect against oil with a high viscosity,and has a short service life,requiring subsequent maintenance.The oil-repellent coating has super-oleophobic and self-cleaning properties.Applying it to the surface of these components can be used to reduce the adhesion of oil stains and reduce the impact on operating efficiency.Therefore,this article has carried out research on the preparation technology of oil-repellent coating and its long-term performance,such as oil-repellent performance,mechanical stability,and acid and alkali resistance.First,a water-based flip-up oil-repellent coating was prepared by the bottom-surface integration method.The coating uses water as the solvent,silica particles as the basic unit to build the rough structure,surfactants as modifiers,and water-based resins as reinforcements.The silane inducing effect turns the hydrophilic unit to the inside,and the oleophobic unit turns to the outside,thereby obtaining a coating with stable super-double phobic properties,and due to the pinning effect of the deposited fluorosilane on the surface,the oleophobic unit is arranged tightly This prevents hydrophilic units from being attracted back to the outer surface by other polar groups.Two options of single resin addition and compound resin addition were tried to determine the final formulation of the water-based flip abrasion-resistant and oil-repellent coating,which effectively increased the abrasion resistance and long-term oil resistance of the coating.The results show that the coating can resist the friction tester’s 100g load for 250 times,the abrasion tester’s 250g load for 10 cycles,and it can withstand 80℃artificial oil soaking for 8 days;soaking in acid-base salt solution after 7 days,there is no bubbling,wrinkling and other phenomena on the coating surface,and it has good chemical stability.The coating has a certain degree of resistance to soft wear and chemical stability,but due to the poor adhesion and loose porous rough structure of the coating,its resistance to hard wear and long-term chemical stability are poor.In order to further obtain a coating with better long-term oil-repellent properties,an oil-repellent coating with heptafluorodecyltrichlorosilane（FDTS）as modifier was prepared by wet chemical method,and the grafting amount of different fluorosilanes was studied.Impact on coating performance.After testing,the best theoretical fluorosilane grafting amount is 7.365μmol silane/m².At this time,the silane chain network on the surface of the SiO₂particles has the highest degree of densification,and the actual grafting mass fraction reaches 48.98%,which improves the long-term oil resistance of the coating..At the same time,the influence of different primer bonding layers on the wear resistance of the coating was also studied,and the bottom-surface compound oil-repellent coating prepared with epoxy resin as the primer and fluorocarbon-acrylic resin blend as the intermediate paint has good wear resistance and high adhesion force.The results show that due to the large amount of fluorine silane grafted on the surface of the particles,a dense network structure is formed to prevent the penetration of oil droplets,so that the coating has better oil resistance.The prepared coating can sparse n-decane droplets;after being soaked in artificial oil stains at 80℃ for180 days,the rolling angle of soybean oil droplets is less than 20°,and the surface oil stain adhesion area is less than 5%,even in high-viscosity oil stains with a viscosity greater than 2000cP,the surface can still be kept clean;after soaking in acid-base salt solution for 180 days,the coating still maintains its oleophobicity.The chemical stability of the coating is greatly improved compared with the water-based reversal oil-repellent coating,which to some extent solves the problem of oil adhesion affecting the operating efficiency and poor long-term performance of the protective coating,but its resistance to hard wear still poor,the oil droplet rolling angle increased sharply after 10 laps of 250g load wear of the abrasion meter.This is because the topcoat functional layer on the surface of the coating is susceptible to external abrasion and particles fall off,which reduces the low surface energy substances on the surface.Loss of oleophobicity.Finally,it is attempted to improve the hard wear resistance of the coating by preparing the anti-oil coating by means of the bottom-surface integration method,and combine the inorganic binder dihydrogenate phosphate（ADP）with the oil-resistant paint particles（F-SiO₂）to obtain the coating and prepare the long-lasting wear-resistant anti-oil coating.The effects of ADP and oil-repellent topcoat particles on the wear resistance of the coating were studied,and the effects of factors such as acidity and alkalinity,solid content of the coating,coating thickness and roughness on the coating performance were explored.Oil-resistant coating formula for wear resistance.This is because the coating contains the above-mentioned highly modified topcoat particles,which has a good oleophobic effect;ADP can be hydrogen-bonded with the substrate and bonded with the topcoat particles to improve the adhesion and strength of the coating;The capsule-like rough structure can continuously expose modified particles after abrasion,maintaining its super oleophobic performance.The experimental results show that the ADP@F-SiO₂ coating has good long-term wear resistance.The rolling angle of oil droplets reaches 10°after 500 laps of wear with a 250g load of the abrasion meter,and still has oleophobic properties;it is coated after being soaked in artificial oil for 5 days.The rolling angle of the oil droplets of the layer reaches 10°;it can be immersed in acid,alkali and salt solution for at least 7 days;at the same time,the coating shows good heat and humidity stability.Compared with the above-mentioned oil-based long-term oil-repellent coatings,this coating has greatly improved abrasion resistance and can cope with harsher and susceptible environments.However,the addition of lipophilic ADP reduces the long-term oil foam resistance of the coating.