Overview
Butadiene, chemically known as 1,3-butadiene, is a simple conjugated diene and a vital industrial chemical. It is predominantly derived from the cracking of naphtha or gas oil during petroleum refining. As a key monomer in polymer chemistry, butadiene's reactivity allows it to form long chains, making it indispensable for synthetic rubber production. Globally, over 60% of butadiene is used to manufacture styrene-butadiene rubber (SBR), which is widely employed in tire production. Its versatility extends to other elastomers like polybutadiene rubber (PBR) and engineering plastics such as ABS, highlighting its critical role in modern materials science.
Physical and Chemical Properties
Butadiene is a colorless gas at room temperature with a faint aromatic odor. It is highly volatile, with a boiling point of -4.4°C, and is typically stored as a liquefied gas under pressure. The compound's conjugated double bonds make it highly reactive, enabling polymerization and copolymerization with styrene or acrylonitrile. Notably, butadiene is flammable and forms explosive peroxides when exposed to air, necessitating stabilizers like hydroquinone during storage. Its solubility in water is limited, but it mixes well with organic solvents. These properties dictate stringent handling protocols to prevent accidents and ensure workplace safety.
Main Applications
The primary application of butadiene lies in the production of synthetic rubbers. Styrene-butadiene rubber (SBR) accounts for the largest share, used extensively in automotive tires due to its abrasion resistance and durability. Polybutadiene rubber (PBR) is valued for its low-temperature flexibility and impact resistance, often blended with natural rubber. Butadiene is also a cornerstone of ABS resins, which combine strength and moldability for consumer electronics and automotive parts. Additionally, it serves as an intermediate in manufacturing hexamethylenediamine (for nylon-6,6) and other specialty chemicals, underscoring its industrial versatility.
Safety and Storage
Butadiene poses significant health and safety risks, including carcinogenicity and flammability. Prolonged exposure may cause respiratory issues and central nervous system depression. Workers must use NIOSH-approved respirators and flame-resistant clothing in handling areas. Storage requires pressurized or refrigerated containers in well-ventilated spaces, away from oxidizers and ignition sources. Stabilizers are added to inhibit peroxide formation. Emergency measures include leak detection systems and grounded equipment to prevent static discharge, as butadiene vapors can form explosive mixtures with air.
B2B Procurement Guide
When procuring butadiene, prioritize suppliers with ISO-certified manufacturing facilities and adherence to REACH or TSCA regulations. Key specifications include purity (≥99.5%), inhibitor content (e.g., 100-200 ppm hydroquinone), and moisture levels (<50 ppm). Transportation typically involves specialized tanker trucks or railcars with UN1010 certification. Contracts should outline testing protocols (ASTM D2593 for purity) and incoterms clarifying liability. For reference, spot prices fluctuate with crude oil trends, while long-term agreements may offer stability. Always verify SDS documentation and regional compliance before shipment.
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