CAS 26590-05-6 corresponds to Polyquaternium-7, a copolymer of dimethyl diallyl ammonium chloride and acrylamide, serving as a cationic high-molecular-weight surfactant widely used in personal care conditioning, wastewater treatment, and oilfield additives.

Core information
- Chinese Name: Polyquaternium-7; Dimethyldiallyl Ammonium Chloride – Acrylamide Copolymer
- English Name: Polyquaternium-7; Poly(acrylamide-co-diallyldimethylammonium chloride)
CAS No.: 26590-05-6 (some data also associates with 108464-53-5)
- Molecular formula: (C₈H₁₆ClN)ₙ·(C₃H₅NO)ₘ
Appearance: Colorless to light yellow viscous transparent liquid (typically aqueous solution)
Density: approximately 1.02 g/cm³ (10% aqueous solution, 25°C)
- pH value: 5.0–8.0 (1% aqueous solution)
Viscosity: Typically 8000–20000 mPa·s (25°C, varies with solid content)
- Solubility: Soluble in water, insoluble in crude oil and hydrocarbons
- Thermal stability: Decomposition temperature around 150°C; good hydrolytic stability, resistant to acids, alkalis, and salts

Main application fields
1. Personal care and hair care: Used as a cationic conditioning agent in shampoos, shower gels, and shaving creams, it provides anti-static, smoothing, moisturizing, and film-forming lubrication effects.
2. Water treatment: Used as a flocculant and sludge dewatering aid, suitable for urban wastewater, industrial wastewater, and oily wastewater treatment.
3. Paper industry: As a retention aid to enhance fiber bonding, improve paper strength, and clarify white water.
4. Oilfield Chemicals: Used as a clay stabilizer for sand control and production enhancement, applied in fracturing fluids, acidizing fluid modification, and oil-water separation.
Original: 5. Others: Foam stabilizers, industrial cleaning agent components, textile auxiliaries, etc.

Safety and Regulatory Notes
Toxicity: The acute oral LD₅₀ (rat) >39.8 g/kg, classified as low toxicity; however, it may cause skin/eye irritation or allergic contact dermatitis.
Environmental Risk: Classified as “Hazard to aquatic environment – Long-term danger Category 3″ (H412) under GHS, discharge into water bodies must be avoided.
Cosmetic Restrictions: Belonging to the polyacrylamide class of raw materials, the residual acrylamide monomer must be controlled (residual products ≤0.1 mg/kg, rinsed products ≤0.5 mg/kg), complying with the “Technical Specifications for Cosmetic Safety.”.
Storage and Transport: Store in a cool, dry, and well-ventilated area (≤37°C), away from strong oxidizers and ignition sources. Transport as non-hazardous material.

Products :

CAS 26590-05-6 | Polyquaternium-7 (PQ-7 C11H21ClN2O)
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