1. Development and application of modified polyester resins
By modifying polyester resins, the performance of coatings can be significantly improved. For example:
Polyester modified acrylic resins: Studies have shown that polyester modified acrylic resins can maintain the light resistance and weather resistance of acrylic resins while enhancing the toughness of polyester resins, thereby improving the vividness and impact resistance of automotive topcoats.
Hyperbranched aliphatic polyester polyols: This resin has good flexibility, scratch resistance and chemical resistance, can reduce the curing temperature and extend the pot life, thereby improving the process efficiency and durability of the coating.
2. Low solid content and high solid technology
Polyester resins using low solid content and high solid technology can reduce volatile organic compound (VOC) emissions while improving the decorative and mechanical properties of the coating. For example:
Fatty acid synthetic resins: Polyester resins synthesized by the fatty acid method have high amino content and high decorative properties, suitable for automotive topcoats.
Self-crosslinking polyurethane dispersion (PUD): This resin can provide better adhesion and flexibility when mixed with polyester resins.
3. Application of mixing technology
Mixing polyester resin with other resins (such as epoxy resin, acrylic resin, etc.) can optimize the comprehensive performance of the coating:
Epoxy/polyester mixed system: Studies have shown that the mixture of epoxy resin and polyester resin can improve the corrosion resistance and mechanical properties of the coating.
Polyurethane/polyester mixed system: By mixing polyurethane and polyester resins, a coating with both flexibility and weather resistance can be obtained.
4. Introduction of nanomaterials
Introducing nanomaterials (such as TiO2, silica, etc.) into polyester resin can further improve the scratch resistance and chemical resistance of the coating:
TiO2-modified nanosilica (NS): Studies have shown that adding TiO2-modified NS to polyurethane resin can significantly improve the mechanical properties of the coating.
5. Development of water-based coatings
Water-based polyester resins have attracted attention for their environmentally friendly properties. For example:
Water-based polyester resins: Water-based polyester resins synthesized by step-by-step polymerization have good dispersibility and low viscosity, and are suitable for automotive midcoat paint.
Waterborne polyurethane resin: When mixed with waterborne acrylic resin, it can improve the fullness and gloss of the coating.
6. Optimization of curing technology
The performance of polyester resin-based coatings can be further improved by optimizing curing conditions:
Adjustment of curing temperature and time: Studies have shown that lowering the curing temperature or extending the curing time can improve the reflow performance and pot life of the coating.
Self-crosslinking technology: Self-crosslinking polyester resin can be cured at a lower temperature while maintaining the flexibility and adhesion of the coating.
7. Application of composite materials
Combining polyester resin with other materials (such as glass fiber, carbon fiber, etc.) can produce lightweight and high-strength composite materials:
Glass-reinforced plastic (FRP): This material is widely used in automotive parts and has excellent mechanical properties and corrosion resistance
