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LPB (Liquid Polybutadiene )
Liquid Polybutadiene
LPB
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Epoxidized Polybutadiene(EPB) CAS No. 71342-74-0 EPB
Epoxidized Polybutadiene
EPB
CAS No. 71342-74-0
Chemical Name: Epoxidized Polybutadiene
Aliases: Polybutadiene epoxy resin
Code: EPB
CAS No. 71342-74-0
Product Description
EPB(Epoxidized Polybutadiene) also known as polybutadiene epoxy resin. It is a functional liquid polymer produced by the epoxidation modification of low molecular weight liquid polybutadiene (LPB).
Product properties & Features
EPB is produced by oxidizing a portion of the unsaturated double bonds in the polybutadiene molecular chain into epoxy groups. By introducing polar epoxy groups onto the non-polar polybutadiene backbone, EPB retains the flexibility of polybutadiene while gaining the reactivity and polarity of epoxy groups.
Triple Reactivity: Epoxy groups cure with amines/anhydrides (epoxy systems); terminal hydroxyl groups cure with isocyanates (PU systems); residual double bonds crosslink with peroxides/UV light, enabling flexible curing methods and controllable crosslink density.
Polarity & Adhesion: Epoxy groups enhance polarity, oil resistance, aging resistance, and adhesion, providing high bonding strength to metals, plastics, and glass.
Low-Temperature Flexibility + Heat Resistance: The polybutadiene main chain ensures flexibility at -50°C, while epoxy curing imparts heat resistance up to 180–250°C, with better thermal stability than conventional epoxies.
Low Viscosity & Easy Processability: Castable, potting, and coatable at room temperature; solvent-free and low VOC, suitable for complex components and eco-friendly formulations.
Applications
Epoxy Modification & Toughening: Toughen E-51/E-44 epoxies to improve impact resistance, fatigue resistance, and low-temperature flexibility, used in structural adhesives, composites, electronic potting.
Polyurethane Materials: Reacts with isocyanates to form PU elastomers, sealants, adhesives, combining high elasticity, oil resistance, and adhesion.
Electronics & Electrical: Potting for high-voltage components, PCB protection, insulating coatings, offering moisture resistance, temperature resistance, insulation, and vibration resistance.
Specialty Coatings: Anti-corrosion, waterproof, damping, UV-curable coatings, with strong adhesion, weather resistance, and chemical resistance.
Adhesives & Sealants: Automotive, construction, and pipeline sealants, featuring high bond strength, oil resistance, and weather resistance.
Packing & Storage
50kg/plastic drum or 180kg/metal drum packaging.
Storage should be cool, dry and ventilated. The shelf life is 12 months, after the expiration of the re-inspection can still be used.
Avoid rain and sun during transportation. Do not mix with strong oxidants.
Technical Index
| Item | EPB-L | EPB-M | EPB-H | EPB-T |
| Molecular weight | 2000-4000 | 2000-4000 | 2000-4000 | 1700-2100 |
| Epoxide number (mmol/g) | 0.5-1.5 | 2.0-4.0 | 4.5-5.5 | 3.1-4.8 |
| Viscocity (40°C/104°F, Pa·s) | ≤5.0 | ≤20 | ≤50 | 170-790(25℃) |
| Moisture, % | ≤0.50 | ≤0.50 | ≤0.50 | ≤0.50 |
* NOTE: Custom production of EPB, EHTPB & ETPB (Epoxy-terminated Polybutadiene liquid rubber) available against client specifications.
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