Introduction to Methacryloxyethyltrimethyl Ammonium Chloride

Methacryloxyethyltrimethyl ammonium chloride, with the CAS Number 5039-78-1, is a quaternary ammonium compound widely used as a cationic monomer in polymer chemistry and industrial applications. Also known as METAC or DMAHDM, this compound is valued for its cationic properties and versatility in producing polymers for water treatment, coatings, and biomedical applications.

Chemical Properties

Methacryloxyethyltrimethyl ammonium chloride is typically supplied as a colorless to pale yellow aqueous solution or a white crystalline solid. Its key chemical properties include:

  • CAS Number: 5039-78-1

  • Molecular Formula: C9H18ClNO2

  • Molecular Weight: 207.70 g/mol

  • Density: Approximately 1.15 g/cm³ (for aqueous solutions)

  • Solubility: Highly soluble in water, soluble in polar solvents like methanol

  • Appearance: Clear to pale yellow liquid (in solution) or white crystalline solid

  • pH: Typically acidic in aqueous solutions (pH 4–6)

These properties make METAC an effective monomer for polymerization, particularly in cationic polymer synthesis.

Applications

1. Polymer Synthesis

Methacryloxyethyltrimethyl ammonium chloride is a key cationic monomer used in the production of cationic polyacrylamide and other polymers. These polymers are essential for applications such as sludge dewatering, papermaking, and textile processing, where they enhance flocculation and retention properties.

2. Water Treatment

METAC is widely used in water treatment as a coagulant and flocculant. Its cationic nature allows it to effectively neutralize and aggregate suspended particles, making it ideal for wastewater treatment in industries like municipal water management, mining, and oilfield operations.

3. Biomedical and Dental Applications

Due to its antimicrobial properties, METAC is incorporated into dental resins and coatings to prevent bacterial growth. It is used in dental composites and adhesives to enhance durability and reduce the risk of secondary infections.

4. Coatings and Adhesives

The compound is used in the formulation of specialty coatings, adhesives, and antistatic agents, providing enhanced adhesion and stability in products for industrial and consumer use.

Safety and Handling

Handling Methacryloxyethyltrimethyl ammonium chloride (CAS No. 5039-78-1) requires strict adherence to safety protocols:

  • Hazards: May cause skin and eye irritation (H315, H319) and is harmful if inhaled or ingested. It is also toxic to aquatic life (H411).

  • Protective Measures: Use personal protective equipment (PPE), including gloves, safety goggles, and respiratory protection. Work in a well-ventilated area to minimize exposure risks.

  • Storage: Store in a cool, dry, well-ventilated area at 2–8°C, away from heat sources and incompatible materials.

  • Disposal: Dispose of according to local regulations for hazardous chemicals to prevent environmental contamination.

Always consult the Material Safety Data Sheet (MSDS) for detailed safety information before handling.

Frequently Asked Questions (FAQs)

What is Methacryloxyethyltrimethyl Ammonium Chloride (METAC)?

Methacryloxyethyltrimethyl Ammonium Chloride (METAC) is a cationic vinyl monomer with formula CH₂=C(CH₃)COOCH₂CH₂N(CH₃)₃Cl and CAS 5039-78-1, used to introduce positive charges into polymers. It’s an aqueous solution ideal for flocculants and conditioning agents in water and personal care applications.

How is METAC polymerized for flocculants?

METAC is copolymerized with acrylamide using persulfate initiators at 40-60°C, targeting 30-40% incorporation for optimal charge; post-polymerization hydrolysis is minimized by inert atmosphere control.

Is METAC safe for cosmetic formulations?

Yes, METAC-derived polymers are CIR-approved for rinse-off and leave-on products up to 5%, with low skin irritation potential due to quaternary structure and no free amine release.

What is the shelf life of METAC?

In sealed, cool storage (5-25°C) away from light, METAC solutions retain >98% activity for 12-18 months, with periodic assay checks to monitor for minor hydrolysis.

Can METAC be copolymerized with anionic monomers?

METAC balances anionic acrylates effectively in amphoteric polymers for broad pH stability, but maintain 1:1 charge ratios to avoid precipitation—conduct jar tests for emulsion integrity.

Does METAC affect the pH of polymer solutions?

METAC’s neutral pH range (4.0-6.0) yields polymers with minimal buffering, suitable for acidic to neutral systems without additional adjustment in most wastewater applications.

What packaging options are available for METAC?

We supply 200kg HDPE drums, 1000kg composite IBCs, and 20MT bulk containers, all nitrogen-blanketed to prevent oxidation and compliant with UN 1760 for corrosive liquids.

For polymerization recipes, safety data, or tailored concentrations, our technical experts are available.

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