The wind blade materials currently on the market are mainly fiber reinforced epoxy resins and unsaturated polyesters. Wind turbines are subject to many harsh environments, such as large temperature differences, strong light, sand abrasion, acid rain corrosion, and snow and ice. When the blades are running at high speed, the tip speed is generally over 100 m/s. Long-term exposure of the blade to the natural environment quickly wears, ages and pulverizes until it breaks. In addition, the lifting of large blades is time consuming and expensive, and it usually takes more than 10 years to perform maintenance. The simplest and most effective protection method is to use paint for protection. Different environments have different requirements for wind power blade protective coatings. There are two main types:

    1) Inland protective coatings. At present, more than 90% of wind turbines are working on land. The working environment is often strong, and the sand and temperature difference are large, such as the western part of China. This requires that the blade protective coating must have excellent weatherability, impact resistance, wear resistance and high and low temperature flexibility. In addition, these places tend to be cold in winter, with more rain and snow. Blade ice coating seriously affects power generation efficiency and greatly shortens the service life of the blades. Therefore, anti-icing performance is also an important indicator.


    2) Protective coatings for marine use. The ocean has huge wind resources, and European countries are at the forefront of offshore wind power. In 2011, a total of 1,247 offshore wind turbines from 49 wind farms in 9 countries including the United Kingdom, Denmark, the Netherlands and Belgium generated 3.294 GW. In 2014, the cumulative installed capacity at sea has reached 8.771 GW. It is estimated that by 2020, the total installed capacity of offshore wind power will reach 40~55 GW, accounting for 10% of the demand for electricity in Europe, and will increase to 17% by 2030. Future offshore wind power will be the fastest growing new energy technology. China's offshore wind power is in rapid development. For example, the Shanghai Donghai Bridge and the Lingang offshore wind farm under construction will lead the development of offshore wind power in China. Due to the influence of the marine environment, offshore wind power protective coatings require excellent corrosion resistance in addition to excellent weather resistance and high and low temperature flexibility. In addition, excellent icing resistance is also essential.

    Whether it is inland protective coatings or marine protective coatings, it is essential to have excellent adhesion to the substrate, chemical resistance and rain erosion resistance. The leading edge of the blade is the thinnest part of the blade, usually the curved surface, which is most vulnerable to wind and sand abrasion and rain erosion. The protection of the leading edge of the large blade is a very important task, which directly determines the service life and working efficiency of the blade. Traditionally, the method of filming on the leading edge of the blade is used to protect it, but air turbulence and many noises are generated during blade operation, and it is easily damaged by ultraviolet rays, and secondary maintenance of the film is also very difficult. Foreign protection of this part is very important, and currently it is protected by coatings. Therefore, the protective coating of wind power blades needs to have many excellent properties in order to prolong the service life of the blades and improve work efficiency. Resin is the most important factor affecting the coating of the blade. For the research of the resin, many work has been done at home and abroad. The resins currently applicable to the wind blade are mainly polyurethane resin, acrylic resin, fluorocarbon resin, silicone resin and epoxy resin. .