With the development of wind energy to this day, cost pressure has always been a problem faced by the industry. At the 6th Asian Wind Energy Conference just concluded, industry experts believe that gradually replacing the currently widely used epoxy resin with a more cost-effective vinyl resin will become the future development trend of wind power blades.
Xiaoshuang Yin, an engineer at Shangwei Wind Power Materials Co., Ltd. pointed out that the most prominent advantage of using vinyl resin instead of epoxy resin is to reduce the cost of blades. The cost of blades accounts for 20% to 30% of the cost of the entire power plant, so material selection is crucial. Replacing epoxy resin with vinyl resin can reduce the cost by about 10%.
The technical staff of DSM Composites Group Jinling DSM Resin Co., Ltd. said that 10% is only a very conservative estimate. After the blade main material is replaced, the supporting products such as gel coat and other surface protection layers will also be changed accordingly, and the saving effect brought is also considerable. In addition, the cost of molds is very high in blade production, and post-curing and other treatments are not required after material replacement, which will greatly improve the efficiency of mold use. Take the 1.5MW blade as an example, the cost of the mold is about 3 million to 4 million yuan. It takes about two days to produce a blade with epoxy resin as the substrate, while it takes only one day to use vinyl resin.
She also proposed another advantage of vinyl resin instead of epoxy resin, namely good processability. Vinyl resin can directly replace epoxy resin without changing the original epoxy resin molding structure design. At the same time, since vinyl resin is similar to unsaturated polyester resin, the main material of another blade, it can also draw on the mature process of preparing unsaturated blades from existing unsaturated resins. In addition, vinyl resin has the mechanical and mechanical properties of epoxy resin, and various performance indicators such as fatigue resistance and stiffness can fully meet the design requirements. Moreover, it is the composite material that is really used on the blades of the wind generator. The performance index of the vinyl resin and the glass fiber and other materials after reasonable matching is not lower than that of the epoxy system composite material.
Xiao Shuangyin also affirmed the performance of vinyl resin. He told reporters that vinyl resin has been widely used in ships and yachts before, and its various properties have been confirmed by many parties.
It is understood that although vinyl resin has great advantages, its application development is still in its infancy, and domestic and foreign companies are actively carrying out research on the application of vinyl resin on blades. Restricted by various factors, it will take time for truly large-scale commercial production. However, many blade manufacturing companies such as Danish Elm Fiberglass Products Co., Ltd. and AVIC Huiteng Company have begun to consider or embark on the application of vinyl resin.