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1, application characteristics
Various forms. Various resin, curing agent and modifier systems can meet the requirements of almost all kinds of applications, from extremely low viscosity to high melting point solids.
Convenient curing. With different curing agents, the epoxy resin system can be cured almost in the temperature range of 0 ~ 180℃.
Strong adhesion. The existence of polar hydroxyl groups and ether bonds in the molecular chain of epoxy resin makes it have high adhesion to various substances. When epoxy resin is cured, the shrinkage rate is low and the internal stress is small, which also helps to improve the bonding strength.
Low shrinkage. The reaction between epoxy resin and curing agent is carried out by direct addition reaction or ring-opening polymerization reaction of epoxy groups in resin molecules, and no water or other volatile by-products are released. Compared with unsaturated polyester resin and phenolic resin, they show very low shrinkage (less than 2%) during curing.
Mechanical properties. The cured epoxy resin system has excellent mechanical properties.
Electrical performance. The cured epoxy resin system is an excellent insulating material with high dielectric properties, surface leakage resistance and arc resistance.
Chemical stability. Generally, the cured epoxy resin system has excellent alkali resistance, acid resistance and solvent resistance. Like other properties of cured epoxy system, chemical stability also depends on the selected resin and curing agent. Proper selection of epoxy resin and curing agent can make it have special chemical stability.
Dimensional stability. The combination of the above properties makes the epoxy resin system have outstanding dimensional stability and durability.
Anti-mold. The cured epoxy resin system can resist most molds and can be used in harsh tropical conditions.
2. Materials of wind turbine blades
Blade is an industry with high certainty, large market capacity and clear profit model in wind power components.
With the easing of tight supply and demand, the fan blade industry will also change from melee to hegemony, and the fan blade industry in China is undergoing industry reshuffle and integration.
With the expansion of the fan blade market, both the cost and the selling price will decrease, but enterprises with advantages in scale, technology and cost will reduce the cost faster than the selling price, and their profits will exceed the average level. The future industry competition pattern requires manufacturers to expand scale, reduce costs and maintain certain advantages in technology.
Epoxy resin refers to an organic polymer compound containing two or more epoxy groups in its molecule, and its relative molecular weight is not high except for a few.
The molecular structure of epoxy resin is characterized by the active epoxy group in the molecular chain, which can be located at the end, middle or cyclic structure of the molecular chain. Because the molecular structure contains active epoxy groups, they can be crosslinked with various types of curing agents to form insoluble and insoluble polymers with three-dimensional network structure.
Reference link: Wind turbine blades _ Baidu Encyclopedia?