C18-22-Alkyldimethylamines (DMA2275) CAS 93164-85-3

Introduction to DMA2275

C18-22-Alkyldimethylamines are composed of linear C18 to C22 alkyl chains bonded to dimethylamino functional groups. The extra-long hydrophobic carbon backbone delivers excellent film-forming, lubricating and surface adsorption properties. It appears as a white to pale yellow waxy solid or flakes at room temperature, with a mild characteristic amine odor. It is insoluble in water and readily soluble in alcohols, hot oils and most non-polar organic solvents.

Industrial production uses precision fractionation to control carbon chain distribution and purity, ensuring consistent amine value across batches. The material readily absorbs atmospheric carbon dioxide to form carbonate salts, which cause color darkening and reduced active amine content over open storage.

DMA2275 Chemical & Physical Properties

Applications of DMA2275

Quaternary ammonium surfactant synthesis: Reacts with methyl chloride or benzyl chloride to produce long-chain cationic quats, the core active ingredients for fabric softeners and hair conditioning products, delivering softening and antistatic effects.

Personal care conditioning agents: Protonates in acidic formulations to form cationic species that adsorb onto hair surfaces, smoothing cuticles, reducing combing friction and eliminating static flyaway in conditioners and hair masks.

Asphalt emulsifiers: Used to produce cationic bitumen emulsifiers for road construction. The long alkyl chains anchor into bitumen droplets, forming stable emulsions with good storage and application performance.

Oilfield chemicals: Serves as a corrosion inhibitor intermediate that forms hydrophobic protective films on steel pipe surfaces, resisting acidic medium corrosion. It also functions as a clay stabilizer in drilling fluid systems.

Storage & Safety Precautions for DMA2275

• Store in tightly sealed packaging in a cool, dry warehouse. Nitrogen blanketing is recommended for bulk storage. Air exposure causes carbon dioxide absorption, color darkening and reduced active amine value.
• Handle with safety goggles, nitrile gloves and protective clothing. Molten material causes skin and eye irritation; avoid direct contact during melting and transfer operations.
• Keep away from strong acids and oxidizing agents. Contact with concentrated acids triggers exothermic neutralization reactions and may generate amine fumes.

DMA2275 FAQ

Q: What is C18-22-Alkyldimethylamines (DMA2275) mainly used for?

A: It is a key intermediate for quaternary ammonium surfactants, fabric softeners, hair conditioners, asphalt emulsifiers and oilfield corrosion inhibitors.

Q: Why does DMA2275 require sealed storage?

A: It absorbs atmospheric CO2 to form carbonates, causing color darkening and reduced active amine content. Sealed cool storage preserves performance.

Q: Is DMA2275 solid or liquid at room temperature?

A: It is a white to pale yellow waxy solid at room temperature, and melts into liquid at elevated temperatures.