In the production of wind turbine blades, PTFE (Polytetrafluoroethylene) material does have specific applications, primarily concentrated in the following areas:

1. Auxiliary Materials in the Manufacturing Process

• Demolding & Delamination Prevention:
  During blade mold closure, PTFE film is bonded to mold edges as a barrier interface. This prevents concentrated stress generated by resin curing from causing delamination at the mold seam. For example, Sinoma Science & Technology's patented technology utilizes PTFE film combined with fiberglass cloth and foam material to effectively enhance blade quality.

• Surface Treatment:
  PTFE nano-composite films can be used for blade surface spraying to reduce bubble formation and protect the surface, improving blade durability and corrosion resistance.

2. Functional Coatings and Protection

• Anti-Icing & Corrosion Resistance:
  Due to its low surface tension and hydrophobic properties, PTFE material is made into nano-composite films or coatings applied to blade surfaces. This prevents ice formation, salt spray corrosion, and adhesion of marine biofouling organisms. For instance, China Three Gorges Corporation's patented technology uses PTFE film to improve blade aerodynamic performance while enhancing anti-aging and rain erosion resistance.

• Self-Cleaning & Drag Reduction:
  PTFE coatings can reduce the adhesion of dust, insects, etc., on the blade surface, lowering cleaning costs. They also improve aerodynamic efficiency by optimizing surface roughness.

3. Other Potential Applications

• Sealing & Insulation:
  PTFE's properties of high-temperature resistance, corrosion resistance, and electrical insulation make it potentially suitable for internal blade seals or electrical insulation components. However, such applications are relatively uncommon and depend on specific design requirements.

Summary

PTFE is not a primary structural material for wind turbine blades (the main structure still relies on carbon fiber and glass fiber composites). However, its unique physicochemical properties enable it to play significant roles in mold assistance, surface protection, and functional coatings. It demonstrates distinct advantages, particularly in enhancing blade resistance to extreme environments (such as low-temperature icing and high-humidity salt spray). With advancements in material technology, PTFE's application scenarios are likely to expand further.