Preparation And Performance Of Anti-icing And Anti-corrosive Materials For Wind Turbine Equipment

Natural disasters have always been a problem faced by people.The impact of icing in human living regions is terrible on human economy and life.Wind energy is a new source,but the icing in wind turbines will seriously affect the operation and shorter component life.There are two anti-icing methods: active de-icing and passive de-icing.Passive deicing is a direct and rapid deicing method that has become the main method of deicing in people's lives,but it requires a lot of energy and money,and may threaten the safety of workers.Therefore,the active deicing method has attracted people's attention.The hydrophobic and self-cleaning surfaces have anti-icing capabilities have been confirmed by researchers,but commercial anti-icing paints are still in their infancy.We combine the existing technology and experimental conditions to prepare superhydrophobic materials that can be applied to wind turbine equipment to achieve the purpose of anti-icing and anti-corrosion.Therefore,some superhydrophobic coating that can be applied to wind turbine metal frame,stone base and blades has been studied in this paper.The research content and experimental results of this thesis are as follows:1.Using ethyl orthosilicate and ferric hydroxide as raw materials,a superhydrophobic surface was prepared on the surface of a series of metal substrates by hydrothermal method.The static water contact angle can reach 160°,and the rolling angle is lower than 5°.A micro-nano double rough structure can be formed on a metal substrate through a mixed solution of silica sol and iron hydroxide under acidic conditions,and forming superhydrophobic surface after modified by hydrophobic agent.The air in the nanopores on the superhydrophobic surface forms an air barrier layer which can change the icing process of the water droplets on the substrate surface by heat conduction between the substrate and the water droplets.The icing area,icing time and deicing speed of two samples at-15? illustrate the anti-icing performance.The experimental results show that the superhydrophobic samples prepared by us can delay the freezing time by 85%,and the surface area of superhydrophobic samples is significantly less than that of blank samples within the first 5 hours of the icing process.In addition,the ice adhesion of superhydrophobic samples is 50% lower than ordinary samples.2.We mix hydrophobic nano-silica particles with micron-sized calcium carbonate particles,and then use polydimethoxysilane(PDMS)as a modifier to prepare anticorrosion and superhydrophobic coating that has good adhesion properties when applied directly to the concrete substrate.The double-rough porous surface formed by this coating not only has hydrophobic self-cleaning properties,but also the superhydrophobic surface has self-healing ability due to the presence of PDMS.In addition,we explored the effects of the content of silica,calcium carbonate,and PDMS on the hydrophobicity of the coating,and tested its durability and corrosion resistance.Experimental results show that after 3 months of monitoring,coated outdoor walls and coated cement blocks still have hydrophobic and self-cleaning properties.The corrosion current of the coated iron plate is reduced by 57.1%,and the corrosion potential is increased by 3.9%.3.In order to improve mechanical and anti-icing properties of hydrophobic coatings,we added a new epoxy resin modifier.First,the nano-scale silica particles were prepared by sol-gel method.Second,the silica,calcium sulfate,and methyl cellulose were mixed in a certain ratio under constant temperature conditions.Finally,the new epoxy resin modifier was used to obtain an abrasion-resistant and superhydrophobic coating.The experimental results show that the water contact angle of this coating can reach 157 ° ± 1.5 ° and a lower 5° of sliding angle.Meanwhile,it could keep above 150° water contact angle after rubbing 35 times by 600 mesh sandpaper.In addition,the icing process was simulated at-10?,and the anti-icing performance of the coating was reflected by measuring the ice weight on the sample surface and the time required for the same volume of droplets to freeze.Compared with ordinary surfaces,superhydrophobic coating can delay the icing time by 50% and reduce the surface ice weight by 43%,which provides a new method to solve the icing problem of outdoor equipment.