Stearyldimethylbenzylammonium chloride

Product Details

CasNo： 122-19-0

MF： C27H50ClN

Appearance： paste

Delivery Time： 15 days

Packing： 25kg/drum

Purity： 99%

1. Basic Information

• Chinese Name: 十八烷基二甲基苄基氯化铵
• English Name: Stearyl Dimethyl Benzyl Ammonium Chloride; Dodecyl dimethyl benzyl ammonium chloride (historical alias, now standardized to "stearyl" for C18 chain)
• CAS Number: 122-19-0
• Molecular Formula: C27​H50​ClN
• Molecular Weight: 424.15 g/mol
• Chemical Structure: A quaternary ammonium cation with a long hydrophobic stearyl chain (C18), two hydrophilic dimethyl groups, and a benzyl group, paired with a chloride anion.
• Common Synonyms: SDMBC; Benzalkonium chloride C18 homologue; Octadecyl dimethyl benzyl ammonium chloride

2. Physical and Chemical Properties

3. Key Performance Characteristics

1. Dual Functionality: Surfactant + Antimicrobial
   As a cationic surfactant, SDMBC reduces surface tension for wetting/penetration; as an antimicrobial, its quaternary ammonium cation binds to negatively charged microbial cell membranes, disrupting membrane integrity and causing cytoplasmic leakage—achieving rapid bactericidal/fungicidal effects (99.9% kill rate against S. aureus within 5 minutes at 0.1% concentration).
2. Strong Adsorption and Long-Lasting Efficacy
   The long stearyl chain enables strong adsorption on surfaces (e.g., textile fibers, metal pipes), forming a persistent antimicrobial film. In textiles, this provides 30+ washes of antimicrobial protection; in industrial water systems, it prevents microbial reattachment for 1–2 weeks.
3. Excellent Compatibility with Non-Ionics/Amphoterics
   Compatible with non-ionic surfactants (e.g., polysorbate 80) and amphoteric surfactants (e.g., cocamidopropyl betaine), but reacts with anionic surfactants (e.g., SLES) to form precipitates—requiring sequential addition or phase separation in formulations.
4. Low Toxicity and Mild Irritation (at Recommended Dosages)
   At industrial/cosmetic dosages (0.01%–0.5%), it exhibits low acute toxicity (oral LD₅₀ in rats: 500–1000 mg/kg) and mild skin irritation. However, high concentrations (>1%) may cause skin dryness or eye irritation, requiring proper dilution.

4. Application Fields

1. Disinfection & Sanitization

• Healthcare: Used in disinfectants for surgical instruments, ward surfaces, and hand sanitizers (0.1%–0.5% concentration) to prevent cross-infection.
• Water Treatment: Added to industrial cooling water, swimming pools, and irrigation systems (5–20 ppm) to control algae and slime-forming bacteria, reducing pipeline corrosion.
• Household Sanitizers: Active ingredient in surface wipes, toilet cleaners, and mold removers (0.2%–1% concentration) for hard surfaces (tiles, stainless steel).

2. Textile Industry

• Antimicrobial Finishing: Applied to medical textiles (scrubs, bandages), sportswear, and socks (0.5%–2% dosage) to inhibit odor-causing bacteria (e.g., Micrococcus luteus) and fungi.
• Softener & Antistatic Agent: Adsorbs on fiber surfaces to reduce friction (improving fabric softness) and neutralize static charge—used in cotton, polyester, and blended textiles.

3. Personal Care

• Hair Care: Added to conditioners (0.05%–0.2%) to neutralize hair’s negative charge, reducing frizz and improving combability; also provides mild antimicrobial protection for scalp health.
• Skin Care: Used as a preservative in creams, lotions, and deodorants (0.01%–0.1%) to prevent microbial spoilage; compatible with most skin care actives (e.g., hyaluronic acid, vitamins).

4. Industrial Auxiliaries

• Oilfield & Petrochemicals: Added to drilling fluids and pipeline treatments (10–50 ppm) to inhibit sulfate-reducing bacteria (SRB), which cause pipeline corrosion and souring.
• Papermaking: Used as a slime control agent (5–15 ppm) to prevent microbial growth in pulp, improving paper quality and reducing machine downtime.
• Paints & Coatings: Acts as a 防霉剂 (mildew inhibitor) (0.1%–0.3%) in water-based paints to prevent mold growth on painted surfaces (e.g., walls, furniture) in humid environments.

5. Safety & Usage Guidelines

• Hazards & Precautions:
  • Skin/Eye Irritation: Avoid direct contact; wear gloves and goggles during handling. Rinse with plenty of water for 15+ minutes if contact occurs.
  • Incompatibility: Do not mix directly with anionic surfactants or strong alkalis to prevent precipitation/decomposition.
  • Environmental Impact: Poorly biodegradable; avoid excessive discharge into water bodies (comply with local environmental regulations).
• Recommended Dosages:
  • Disinfection: 0.1%–1% (water-based formulations); 0.5%–2% (solvent-based formulations).
  • Textiles: 0.5%–2% (finishing bath concentration).
  • Personal Care: 0.01%–0.5% (preservative/conditioning agent).
  • Industrial: 5–50 ppm (water treatment/slime control).

6. Packaging & Storage

1. Packaging Forms

• Solid Grade (Wax/Powder): 25 kg kraft paper bags (lined with PE film) or 50 kg HDPE drums—moisture-proof and sealed to prevent caking.
• Liquid Grade (50%–80% aqueous solution): 200 L HDPE drums or 1000 L IBC totes—leak-proof and resistant to chemical corrosion.
• Sample Sizes: 100 g/500 g aluminum foil bags (solid) or 1 L HDPE bottles (liquid)—for R&D trials.

2. Storage Conditions

• Store in a cool, dry, well-ventilated area (temperature: 15–30°C, relative humidity: <60%); avoid direct sunlight and high temperatures (>70°C) to prevent melting.
• Keep away from strong alkalis, anionic surfactants, and oxidizing agents.
• Shelf Life: Unopened solid grade: 24 months; unopened liquid grade: 18 months. Use opened packages within 3 months and reseal promptly.