Chemical Name: Hydroxyl-terminated polybutadiene
Code: HTPB
CAS No. 69102-90-5
Chemical name: Hydroxyl-terminated polybutadiene
CAS No.: 69102-90-5
Code: HTPB
Standard: GB/GJB(GJB1327A-2021)
HS CODE: 3902 9000.30
Feature: 10,000 MT annual capacity & Customization of various specifications is available.
Product Description
HTPB(Hydroxyl-Terminated Polybutadiene) is a high-molecular polymer synthesized from butadiene monomers. It carries reactive hydroxyl groups at both ends of molecular chains and exists as a low-viscosity liquid at room temperature.
As a reactive liquid rubber, its polybutadiene backbone and terminal hydroxyl structure deliver high curing reactivity, excellent process fluidity and comprehensive mechanical properties.
It reacts with chain extenders and crosslinkers under ambient or high temperatures to build a three-dimensional crosslinked network. The cured material boasts superior mechanical performance, good hydrolysis resistance, acid & alkali resistance, abrasion resistance, outstanding low-temperature toughness and excellent electrical insulation.
A high-performance liquid polyol, HTPB is widely used in adhesives, sealants, coatings, electronic potting compounds and elastomers.
Product properties & Features
The performance properties of HTPB as follow:
Reactive terminal hydroxyl groups
Pale, high-clarity low-viscosity liquid
Excellent mechanical performance with glass transition temperature down to -80 ℃
Remarkable low-temperature flexibility & cold resistance
Superior hydrophobicity and water resistance
Ultra-low moisture vapor permeability
Great resistance to hydrolysis, aqueous acids, alkalis and various chemicals
Outstanding abrasion resistance
Strong adhesion to various substrates
Premium electrical insulation properties
Good compatibility with multiple resin systems
Performance Comparison: HTPB VS CTBN VS CTPB VS ATBN VS HTBN
| Item | End Group | Main Chain Structure | Main Curing System | Key Characteristics | Typical Applications |
| HTPB | -OH | Pure polybutadiene | Isocyanate | Low viscosity, good processability, excellent mechanical properties, hydrolytically stable | Solid rocket propellant binder, coatings, adhesives, elastomers |
| CTBN | -COOH | Butadiene-acrylonitrile copolymer | Epoxy resin / Isocyanate | Contains acrylonitrile units, good oil resistance, excellent compatibility with epoxy resins | Epoxy resin toughening modification, structural adhesives, composites |
| CTPB | -COOH | Pure polybutadiene | Epoxy resin / Isocyanate | No nitrile groups, good low-temperature performance, high purity, relatively high reactivity | Solid propellant binder (less common), elastomers, sealants |
| ATBN | -NH₂ | Butadiene-acrylonitrile copolymer | Epoxy resin (high reactivity) | Contains acrylonitrile, fast amine-end reaction, rapid cure with epoxy systems | Fast epoxy curing systems, adhesives, tough coatings |
| HTBN | -OH | Butadiene-acrylonitrile copolymer | Isocyanate | Contains acrylonitrile units, combines hydroxyl reactivity with moderate oil resistance | Polyurethane elastomers, adhesives, oil-resistant sealing materials |
Applications
Adhesives
Coatings
Solid Propellants
High-performance Structural Adhesives & Sealants
Rubber & Plastic Products
Electrical Insulation Materials
Polyurethane (PU) Elastomers
Composite Materials for Automotive & Aerospace
Construction Materials: Roof Waterproofing, Anti-corrosion & Thermal Insulation Materials, Construction Adhesives
Electronic Potting & Encapsulation Compounds
Polymer Modification
Packing & Storage
Storage should be cool, dry and ventilated. The optimum temperature is -20~38℃.
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 | Grade l | Grade ll | Grade lll | Grade lV | Grade V | Grade VI | Grade VII |
| Appearance | achromatous or light yellow, no visible impurities | ||||||
| Hydroxyl value,(mmol/g) | 0.47-0.53 | 0.54-0.64 | 0.65-0.70 | 0.71-0.80 | 0.81-1.20 | 1.21-1.60 | 1.61-2.00 |
| Viscosity(40°C Pa.s)≤ | 9.5 | 8.5 | 4.0 | 3.5 | 4.0 | 3.0 | 3.5(30℃） |
| Peroxide mass fraction,% | 0.04 | 0.04 | 0.05 | 0.05 | 0.08 | 0.10 | 0.15 |
| Moisture,wt% ≤ | 0.05 | 0.05 | 0.05 | 0.05 | 0.10 | 0.10 | 0.10 |
| Volatile Content,% ≤ | 0.5 | 0.5 | 0.65 | 0.65 | 0.75 | 0.75 | 0.90 |
| Molecular weight | 3800-4600 | 3300-4100 | 3000-3600 | 2700-3300 | 2000-3000 | 1300-2500 | 1000-2000 |
NOTE: We can customize HTPB according to customers' applications and specification requirements, including mono-functional, hydrogenated, and epoxidized HTPB.
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