| Customization: | Available |
|---|---|
| CAS No.: | 69102-90-5 |
| Formula: | Ho-(C4h6)N-Oh |
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Basic Information
Product Name: Hydroxyl-Terminated Polybutadiene (HTPB)
Chemical Structure: A linear telechelic polymer synthesized from 1,3-butadiene monomers, with hydroxyl (-OH) functional groups at both ends of the molecular chain.
Molecular Formula:HO-(C4H6)n-OH(n is the degree of polymerization, typically 50∼200)
CAS Number: 69102-90-5
Appearance: Transparent or light yellow viscous liquid at room temperature, odorless; can solidify into an elastomer at low temperatures.
Molecular Weight: Common specifications range from 2000 to 4000 g/mol (adjustable by controlling the degree of polymerization).
Physicochemical Properties
Hydroxyl Value: 28~56 mg KOH/g (corresponding to molecular weight 2000~4000)
Viscosity (25ºC): 500~5000 mPa·s (higher molecular weight results in higher viscosity)
Glass Transition Temperature (Tg): -70~-55ºC (depends on microstructure; higher 1,2-structure content leads to higher Tg)
Solubility: Soluble in organic solvents such as toluene, acetone, and chloroform; insoluble in water.
Reactivit: Hydroxyl groups can react with isocyanates (-NCO), acid anhydrides, and epoxides, making it a key raw material for polyurethane synthesis.
Main Application Fields
Polyurethane (PU) Elastomers and Adhesives:
Core Applications: As a soft segment raw material, it reacts with isocyanates (e.g., TDI, MDI) and chain extenders (e.g., 1,4-butanediol) to form polyurethane elastomers, used in:
Tire Inner Linings: Improves flex resistance and impact resistance.
Industrial Seals: High-performance rubber products resistant to oil and aging.
Adhesives: Bonds metals, rubbers, and plastics, especially for dynamic load scenarios (e.g., aerospace components).
Solid Rocket Propellants:
High-Energy Fuel Binder: As a binder in composite propellants, it is mixed with fillers like ammonium perchlorate (AP) and aluminum powder. After curing, it forms a high-strength matrix that provides mechanical support and participates in combustion reactions (releasing substantial heat).
Advantages: Low glass transition temperature (ensures flexibility at low temperatures), good process fluidity, and excellent compatibility with oxidizers.
Coatings and Inks:
Anticorrosive Coatings: Modified for industrial coatings resistant to chemical corrosion (e.g., marine engineering, chemical equipment anticorrosion).
UV-Curable Inks: Hydroxyl groups participate in photocuring reactions to enhance ink adhesion and wear resistance.
Thermoplastic Elastomers (TPE):
Blended with polypropylene (PP), polystyrene (PS), etc., to improve impact resistance and resilience of the matrix, used in automotive parts and daily products.
Advantages and Limitations
Advantages:
Excellent Weather Resistance: The molecular chain lacks easily oxidizable ester or ether groups, offering better ozone and UV resistance than polyester-based polyurethanes.
Outstanding Low-Temperature Performance: Low glass transition temperature, maintaining elasticity at -40ºC, suitable for polar or alpine regions.
Flexible Processability: Pumpable at room temperature, facilitating mixing with fillers and suitable for casting, molding, and other processes.
Limitations:
Moderate Oil Resistance: Non-polar structure causes significant swelling in polar oils (e.g., brake oil), requiring chemical modification (e.g., introducing polar groups) to enhance oil resistance.
Higher Cost: Complex anionic polymerization processes and expensive raw materials (butadiene, alkyl lithium) limit applications in low-end fields.
Modifications and Development Trends
Chemical Modifications:
Introduction of Polar Groups: Reaction of hydroxyl groups with acrylates, maleic anhydride, etc., to improve adhesion to polar substrates (e.g., metal coatings).
Epoxidation Modification: Oxidation of double bonds to form epoxy groups, enabling reaction with amine curing agents to prepare epoxy-polyurethane hybrid materials with enhanced heat resistance.
Biobased Alternatives: Development of biobased HTPB using bio-butadiene (e.g., butadiene from straw fermentation) to reduce carbon footprint and align with green chemistry trends.
Low VOCs Technology: Promotion of solvent-free HTPB systems in coatings/adhesives to replace solvent-based products and meet environmental regulations (e.g., EU REACH standards).
Safety and Storage
Health Hazards: Low toxicity, with mild irritation to skin and eyes; non-carcinogenic (LD50 > 5000 mg/kg, oral administration in rats).
Storage Conditions:
Store in a sealed container in a cool, dry place, away from direct sunlight and high temperatures (recommended temperature <30ºC).
Keep away from oxidizers, acids, isocyanates, and other reactive substances to prevent hydroxyl group consumption or polymerization.
Transport Requirements: Non-hazardous goods, transported as general chemicals; avoid severe vibration to prevent viscosity changes.
| Liquid products | Drum of 5kg ,10 kg ,25 kg ,50 kg 200 kg ,250 kg . 1000 kg IBC drum. TANK with 20 tons ,25 tons . |
| Solid products | Bag of 1 kg ,2 kg ,5 kg ,25 kg ,500kg ,1000 kg . Drum of 25 kg and 50 kg. |
Packaging can be customized according to customer requirements.
Qingdao Jinyu Chemical Co., LTD,which is located in Qingdao City, China, with registered capital of RMB 10 million, is a dynamic chemical import and export enterprise with customer demand as its own responsibility. The founder has been engaged in the chemical industry for more than 20 years. With professional technical and marketing personnel, diversified cooperative factories with synthetic technology and efficient logistics management, we provide services to customers all over the world. After years of hard work, we have selected a number of excellent chemical production cooperative enterprises in China. These enterprises have their own advantages in different chemical synthesis fields. They have passed the strict inspection of suppliers by many customers and formed a long-term and stable strategic partnership with customers. With our partners' excellent equipment, well-trained employees and mature technology, we also continue to provide customers with more products.
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