Impact-Toughened Epoxy for Carbon Fiber Drone Propellers
Key Features
- GIC 400–600 J/m² — 3–4× higher than unmodified epoxy, reduces catastrophic delamination on impact
- Tg 130°C ensures no softening under motor downdraft heat or direct sun exposure
- Quasi-ductile failure mode — absorbs impact energy through microcracking rather than sudden fracture
- Viscosity 600–1,200 mPa·s compatible with both filament winding and wet lay-up propeller manufacturing
- CTBN rubber phase does not cloud transparency of thin-section CF laminates
- Retains >90% flexural strength after 1,000 hours QUV accelerated UV weathering
A rubber-toughened, two-component epoxy resin system specifically developed for the manufacture of carbon fiber drone propellers and rotor blades. Unlike standard structural epoxies optimized for stiffness, this formulation incorporates core-shell rubber (CSR) particles and reactive liquid rubber (CTBN) modifiers to dramatically improve fracture toughness and resistance to impact from debris, hard landings, and bird strike scenarios.
Mode I fracture toughness (GIC) of 400–600 J/m² is 3–4× higher than unmodified aerospace epoxies, while retaining a Tg of 130°C — sufficient for motor downdraft thermal environments. The flexural modulus of 3.5–4.0 GPa and tensile elongation at break exceeding 5% create a quasi-ductile response that absorbs impact energy through matrix microcracking rather than catastrophic delamination.
Viscosity at 25°C is controlled at 600–1,200 mPa·s, supporting both filament winding and wet lay-up manufacture of propeller blades. The 60-minute pot life at 25°C is adequate for blade lay-up and allows open-time for surface coating before bagging. Compatible with standard T700/T800 carbon fiber and woven carbon twill fabrics.
Specifications
| Parameter | Value |
|---|---|
| Cure schedule | 25°C/24h + 60°C/2h post-cure |
| Toughener type | Core-shell rubber (CSR) + CTBN |
| Density (cured) | 1.20–1.25 g/cm³ |
| Flexural modulus | 3.5–4.0 GPa |
| Viscosity (25°C, mixed) | 600–1,200 mPa·s |
| Mix ratio (resin:hardener) | 100:35 by weight |
| Pot life (25°C, 200g mass) | 60 min |
| Tensile elongation at break | >5% |
| Mode I fracture toughness (GIC) | 400–600 J/m² |
| Glass transition temperature (Tg) | 130°C (post-cured) |
Applications
FAQ
Yes, this toughened epoxy is well suited for field repair of CF propellers with edge delaminations or surface impact cracking. For delamination repair: (1) Drill injection ports at 20 mm spacing along the delamination boundary; (2) Inject mixed resin at very low pressure using a syringe; (3) Allow capillary flow to fill the void; (4) Clamp and cure at room temperature 24h + 60°C/2h. For surface crack repair, apply a 2-ply CF patch with the toughened resin. Note: propellers with more than 30% delamination area or cracks propagating into the hub should be replaced rather than repaired.
Direct Contact
💬WhatsApp +86 156 3910 0440Telegram +86 156 3910 0440✉️[email protected]Reply within 24 hours
Related Products
Low-Viscosity Infusion Epoxy for Carbon Fiber Drone Frames
Ultra-low mixed viscosity (200–500 mPa·s) enables complete CF wet-out in VARI and RTM without vacuum assistance above 0.8 bar
Hollow Glass Microspheres for UAV Resin Weight Reduction
30–40% density reduction in epoxy resin at 30–40 vol% loading — significant weight savings in drone fairing compounds
Epoxy Structural Adhesive for Carbon Fiber to Aluminum Drone Bonding
Lap shear 25–35 MPa on CF and aluminum — 3–5× safety factor over typical drone joint loads