Stearyl Methacrylate
Overview
Stearyl methacrylate is a specialty ester of methacrylic acid, characterized by its long C18 alkyl chain. It is primarily used as a monomer in radical polymerization to impart flexibility, water resistance, and low-temperature performance to polymers. Industrial production involves esterification of methacrylic acid with stearyl alcohol, followed by purification. Its hydrophobic nature and compatibility with other acrylates make it a versatile ingredient in high-performance formulations.
Physical and Chemical Properties
As a waxy solid or viscous liquid (depending on temperature), stearyl methacrylate exhibits low volatility and high thermal stability. Its long alkyl chain reduces the glass transition temperature (Tg) of copolymers, enhancing flexibility. Chemically, it undergoes typical acrylate reactions like polymerization, esterification, and Michael additions. The ester group is resistant to hydrolysis under neutral conditions but may degrade in strongly acidic/alkaline environments.
Main Applications
In coatings, stearyl methacrylate improves scratch resistance and gloss retention, especially in automotive and industrial finishes. It acts as an internal plasticizer in adhesives, reducing brittleness without migration. Other uses include lubricant viscosity modifiers, textile softeners, and as a comonomer in acrylic resins for low-Tg applications. Recent research explores its role in UV-curable inks and 3D printing materials.
Safety and Storage
Classified as a Category 2 skin irritant, stearyl methacrylate requires handling with nitrile gloves and eye protection. Spills should be contained with inert absorbents (e.g., sand) and disposed of as hazardous waste. Storage tanks or drums must avoid copper/brass fittings to prevent polymerization catalysis. Inhibitors like MEHQ (100–200 ppm) are typically added to stabilize the monomer during transport.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with batch-specific COAs (Certificate of Analysis) confirming purity ≥98% and inhibitor content. Drum packaging is standard, but ISO tank options may reduce costs for large volumes. Logistics planning is critical due to its melting point—heated trucks or insulated containers may be needed in cold climates. Negotiate MOQs (Minimum Order Quantities) and test samples for compatibility before full-scale procurement.
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