High Molecular Weight Methyl Silicone Oil
Overview
Polymethylhydrosiloxane (PMHS) is a reactive silicone polymer characterized by repeating methylhydrosiloxane units. As a key raw material in silicone chemistry, it serves as both a chain extender and crosslinker due to its active Si-H bonds. The polymer's molecular weight and viscosity can be tailored through controlled polymerization processes. Industrial production typically involves the hydrolysis of methylhydrodichlorosilane, followed by condensation polymerization. PMHS occupies a critical niche in specialty chemicals, bridging the gap between small-molecule silanes and high-molecular-weight silicone elastomers.
Physical and Chemical Properties
PMHS exhibits exceptional thermal stability, maintaining performance from -50°C to 200°C. Its viscosity ranges from 10 to 10,000 mPa·s at 25°C depending on chain length. The material demonstrates low surface tension (20-22 mN/m) and high dielectric strength, making it valuable for electronic applications. The Si-H bonds in PMHS are highly reactive toward alcohols, amines, and unsaturated compounds via hydrosilylation. This reactivity enables its use as a reducing agent in organic synthesis. Unlike dimethylsiloxanes, PMHS shows limited compatibility with polar solvents but excellent miscibility with hydrocarbons.
Main Applications
In silicone manufacturing, PMHS functions as a crosslinker for room-temperature vulcanizing (RTV) rubbers and as a chain extender for high-consistency rubber (HCR). The textile industry utilizes its hydrophobic properties for durable water repellent finishes on fabrics. PMHS serves as an effective defoamer in petroleum processing and wastewater treatment due to its low surface energy. Emerging applications include use as a reducing agent in nanoparticle synthesis and as a surface modifier for silica fillers in composite materials.
Safety and Storage
PMHS requires careful handling as it may release hydrogen gas upon contact with moisture or bases. Storage tanks should be nitrogen-purged to prevent oxidation and moisture absorption. Secondary containment is recommended for bulk storage due to potential leakage risks. Personal protective equipment (PPE) including chemical goggles and nitrile gloves should be worn during handling. In case of skin contact, wash immediately with soap and water. Firefighting measures for PMHS involve alcohol-resistant foam due to its flammability (flash point ~60°C).
B2B Procurement Guide
Industrial buyers should specify required parameters including viscosity (typically 50-1,000 cSt), active hydrogen content (0.8-1.6 wt%), and impurity levels (especially chlorides). Bulk shipments (ISO tanks or drums) offer cost advantages for volumes above 1 metric ton. Quality verification should include FTIR analysis for Si-H bond integrity and Karl Fischer titration for moisture content. Leading manufacturers include Dow Silicones, Momentive, and Wacker. Consider regional logistics for this hazardous material classified under UN3082 for transport.
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