Nano Rubber Toughener Dispersion for Epoxy
Key Features
- Nano scale (50–200 nm) — effective in highly crosslinked epoxy where CSR/CTBN cannot toughen
- Pre-dispersed masterbatch — no grinding or heating required for incorporation
- Minimal viscosity increase at effective toughening loadings vs. CSR powder
- Suitable for thin film epoxy coatings and electronics encapsulation applications
- Combinable with CSR and CTBN for multi-scale toughening approach
Nano Rubber Toughener Dispersion is a concentrated pre-dispersed solution of nano-scale rubber particles (typically 50–200 nm diameter) in epoxy resin, providing a ready-to-use toughening masterbatch that delivers superior toughening efficiency per unit weight compared to conventional micron-scale rubber tougheners. The nano-scale particle size allows nano rubber to toughen highly crosslinked epoxy systems and thin epoxy coatings where conventional CSR (200–500 nm) or CTBN rubber phase separation particles are too large relative to the matrix crosslink density to operate effectively.
Nano rubber particles in epoxy act through a combination of crack pinning, particle bridging, crack deflection, and limited plastic zone expansion at crack tips. Because of their extreme small size, nano rubber particles can be present at very high number densities, providing multiple toughening interactions per unit area of crack surface. This high particle density toughening is particularly effective in brittle, highly crosslinked epoxy systems used in electronics (underfill, molding compounds), thermal management adhesives, and high-temperature structural epoxies where conventional toughening approaches reduce Tg excessively.
The masterbatch format (typically 25–40% nano rubber in epoxy) simplifies handling by eliminating the need to disperse dry powder or viscous liquid rubber into the epoxy. The pre-dispersed particles are already at the target size and concentration — simply dilute the masterbatch into the base epoxy resin at the desired loading (5–20% masterbatch by weight of total resin). Both amine-cured and anhydride-cured epoxy grades are available. The nano rubber can also be used in combination with CSR or CTBN for a hybrid multi-scale toughening approach.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Translucent to hazy amber liquid |
| Shelf life | 12 months at 5–25°C |
| Dispersion medium | Bisphenol A epoxy resin |
| Particle diameter | 50–200 nm |
| Rubber content in masterbatch | 25–40% by weight |
| Typical use level (masterbatch) | 5–20% in total epoxy formulation |
| Viscosity of masterbatch (25°C) | 5,000–50,000 mPa·s |
Applications
FAQ
In highly crosslinked epoxy (Tg > 150°C, high crosslink density), the average spacing between crosslinks is 2–10 nm. Conventional rubber tougheners (CSR 200–500 nm, CTBN rubber particles 200–2000 nm) are much larger than the crosslink spacing, so they cannot fit between crosslinks and cannot drive the local shear yielding mechanism that is responsible for toughening in less crosslinked systems. Nano rubber particles (50–200 nm) are close to or smaller than typical shear band interaction zones, allowing them to interact with the local stress field more effectively and toughen through crack pinning, deflection, and micro-void formation even in highly constrained matrices.
Direct Contact
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