CTBN is liquid nitrile rubber with carboxyl functional groups at both ends of the molecular chain, and the terminal carboxyl group can react with epoxy resin. It is mainly used for toughening epoxy resin. It can be customized according to customers' requirements.
| Item | CTBN-1 | CTBN-2 | CTBN-3 | CTBN-4 | CTBN-5 |
|---|---|---|---|---|---|
| Acrylonitrile content, % | 8.0-12.0 | 8.0-12.0 | 18.0-22.0 | 18.0-22.0 | 24.0-28.0 |
| Carboxylic acid value, mmol/g | 0.45-0.55 | 0.55-0.65 | 0.55-0.65 | 0.65-0.75 | 0.6-0.7 |
| Molecular weight | 3600-4200 | 3000-3600 | 3000-3600 | 2500-3000 | 2300-3300 |
| Viscosity (27℃), Pa-s | ≤180 | ≤150 | ≤200 | ≤100 | ≤550 |
| Volatile matter, % | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 |
CTBN (Carboxyl-Terminated Butadiene Acrylonitrile) is a liquid nitrile rubber structured with reactive carboxyl functional groups at both ends of the molecular chain.
CTBN is primarily used as a high-performance modifier for toughening epoxy resin systems.
The terminal carboxyl groups on both ends of the CTBN molecular chain chemically react with epoxy groups, integrating elastic polymer segments into the cured matrix.
Yes, technical specifications and formulation parameters can be customized according to specific customer requirements.
Standard grades (CTBN-1 through CTBN-5) maintain a low volatile matter content of ≤1.0%.
Acrylonitrile content ranges from 8.0% to 28.0%, while viscosity at 27°C ranges from ≤100 Pa-s to ≤550 Pa-s depending on the specific grade (CTBN-1 to CTBN-5).
