Common knowledge of coating: lotus leaf effect mechanism of coating

Core tip: for a long time, the optimized self-cleaning function has existed in nature, among which lotus leaf is the representative Lotus leaf surface has a good hydrophobicity, and in fact can not be wetted, it is still out of the mud and spotless It is found that the lotus leaf has the above properties because the surface of the leaf is hydrophobic and has a microstructure Self cleaning effect of lotus leaf: V the basic chemical components of lotus leaf are polysaccharide carbohydrates such as chlorophyll, cellulose, starch, etc., which are rich in polar groups such as hydroxyl Oh -, amino NH -, etc in natural environment Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: for a long time, the optimized self-cleaning function has existed in nature, and lotus leaf is one of the representatives Lotus leaf surface has a good hydrophobicity, and in fact can not be wetted, it is still out of the mud and spotless It is found that the lotus leaf has the above properties because the surface of the leaf is hydrophobic and has a microstructure Self cleaning effect of lotus leaf: V the basic chemical components of lotus leaf are polysaccharide carbohydrates such as chlorophyll, cellulose, starch, etc., which are rich in polar groups such as hydroxyl Oh -, amino NH -, etc it should be easy to absorb water or stains in the natural environment However, the lotus leaf has a very strong water repellency The water sprinkled on the leaf will automatically gather into water droplets The rolling of water droplets will suck the dust and sludge on the leaf surface and roll it out of the leaf surface, keeping the leaf clean all the time This is the famous "lotus leaf self-cleaning effect" The microstructure of lotus leaf: V through the scanning electron microscope image, we can clearly see that there are very complex multi nano and micro scale ultrastructure on the lotus leaf surface The lotus leaf is covered with a "hill package" (the distance between two hill packages is about 20-40 μ m) which is next to each other On the top of the hill package, there is a pile of fluff On the top of the hill package, there are buns like "bunkers" protruding The whole surface is covered by tiny wax crystals (about 200nm-2 μ m) As a result, the hollow between the "hills" is filled with air, thus forming a very thin layer of air, only nanometer thick, close to the leaf surface This makes the dust, rain, etc which is much larger than this structure in size fall on the leaf surface, and form several points of contact with the convex top of the "mountain package" on the leaf surface through a very thin layer of air Because of the common supporting effect of the air layer, the "mountain package" protrusion and the wax layer, the water drops can not penetrate, but can roll freely Raindrops form a ball under the action of their own surface tension Water balls absorb dust in the rolling process and roll out of the leaf surface This is the secret of "lotus leaf effect" that can clean the leaf surface Scanning electron micrograph o f lotus leaf surface: necttype = "rect" O: extrusio NOK = "F" style = "margin top: 0px; margin right: 0px; margin bottom: 0px; margin left: 0px; padding top: 0px; padding right: 0px; padding bottom: 0px; padding left: 0px; word wrap: break word; "> surface wetting principle: v when raindrops contact the lotus leaf surface, the lotus leaf surface and raindrops are surrounded by the surrounding air at the same time So there are three kinds of substances in contact with each other, solid, liquid and gas The boundary effect of these three substances determines the shape of the water drop and how the liquid disperses on the solid surface, that is, how to wet the solid bottom The rougher the hydrophilic surface is, the easier it is to be wetted, and the rougher the hydrophobic surface is, the less easy it is to be wetted V the rough hydrophobic surface prevents water from entering the inside of the leaf, only forming water drops on the surface of the leaf, and the contact area between water and the surface of the leaf is only 2% - 3%, thus reducing the friction between the two, making the water drops easily roll off the surface of the leaf without contaminating the surface of the leaf, showing good self-cleaning When the liquid surface is stained with solid particles such as dust, the dust can be wetted by water, stained on the water drop, and washed away with the rolling of the water drop Even hydrophobic dirt, due to its small contact area with the convex part of the leaf, makes the adhesion of water and oil greater than that between wax crystal and oil on the convex part of the leaf, and is easy to be washed away with the rolling of water drops V if the surface is smooth, the dust particles can attach to the completely smooth surface rather than the surface of the water drop, which just pushes it to one side slightly However, if the surface is rough, the dust will adhere to the surface of the water drop better than the rough surface, and then roll down with the water drop Lotus leaf effect latex paint: V lotus leaf effect latex paint is a kind of building paint that can keep the exterior wall dry and clean It is an example of Bionics Application in building paint V this lotus leaf effect latex paint adopts some special substances with long hydrophobicity, less emulsifier, silicone emulsion, and so on, and forms a nano scale microstructure, so that the film has similar surface structure of lotus leaf, and achieves the function of water repellent and cleaning Lotus leaf lotus leaf effect latex paint lotus leaf effect waterproof paint: toilet is the most humid area in the family, so people always put waterproof first in the treatment of ceiling, wall and ground, and the use frequency of ceramic tile and aluminum gusset plate is the highest In fact, the walls of the toilet can be painted with waterproof paint The lotus leaf surface technology is adopted to strengthen the water-proof and air permeability, and ensure the firmness of the paint film on the wall not eroded by water vapor, which can not only resist the moisture in the toilet, but also can be applied to the exterior wall of the building Simulate lotus leaves to make hydrophobic film: this kind of film can simulate lotus leaves If there is water on the surface, the water will gather into beads and roll off, so the surface can remain dry even in heavy rain Small water droplets can also collect dust particles when rolling, so the surface has a "self-cleaning" effect The film can be sprayed on the surface with ordinary aerosol When the hydrophobic effect of spraying layer is worn off, it is easy to spray again Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,