Poly (Acrylamide-co-Diallyldimethylammonium Chloride)

Product Details

CasNo： 26590-05-6

MF： (C8H16ClN)n.(C3H5NO)m

Appearance： liquid

Delivery Time： 15 days

Packing： 200kg/drum

Purity： 99%

1. Basic Information

• Chinese Name: 二甲基二烯丙基氯化铵 / 丙烯酰胺共聚物
• English Name: Poly (Acrylamide-co-Diallyldimethylammonium Chloride); Poly(DMDAAC/AM)
• INCI Name (Cosmetic Use): Polyquaternium-7
• CAS Number: 26590-05-6
• Molecular Formula: (C8​H16​NCl⋅C3​H5​NO)x​ (repeating unit structure; x = degree of polymerization; the molar ratio of DMDAAC to AM varies by grade)
• Average Molecular Weight: Conventional industrial-grade products range from 500,000–8,000,000 Da, customizable by application (low molecular weight: 500k–2M Da for personal care; high molecular weight: 5M–8M Da for water treatment).
• Common Synonyms: Polyquaternium-7; DMDAAC-AM copolymer; Cationic polyacrylamide copolymer

2. Physical and Chemical Properties

3. Key Performance Characteristics

1. Dual Functional Advantages: Electrostatic Neutralization + Adsorption-Bridging:
   The cationic DMDAAC segment neutralizes negative charges on suspended particles (e.g., colloids, sludge, fibers), while the long-chain acrylamide segment forms "bridges" between particles, aggregating them into large, dense flocs. This dual mechanism improves flocculation efficiency by 40% compared to single-component cationic polymers.
2. Wide pH Adaptability:
   Maintains stable performance in the pH range of 3–11 (vs. 5–9 for traditional cationic polymers), making it suitable for acidic industrial wastewater (e.g., electroplating, mining) and alkaline systems (e.g., textile dyeing), eliminating the need for costly pH adjustment.
3. Excellent Compatibility and Versatility:
   Compatible with anionic, non-ionic, and amphoteric additives (e.g., coagulants, surfactants, preservatives). It functions as a flocculant in water treatment, a retention aid in papermaking, a conditioner in cosmetics, and a demulsifier in oilfields—reducing the need for multiple specialized polymers.
4. Low Dosage, High Efficiency:
   Due to its high molecular weight and charge density, effective dosing is only 0.1–5 ppm in water treatment (vs. 5–10 ppm for standard flocculants), cutting chemical consumption and sludge generation by 30%.
5. Environmental Safety:
   Biodegradable (biodegradation rate >65% per EU EC 1272/2008) and non-toxic to aquatic organisms (fish LC₅₀ > 1,000 mg/L). It contains no persistent organic pollutants, aligning with global green chemistry regulations.

4. Application Fields

1. Water Treatment (Core Scenario)

• Sludge Dewatering: Ideal for organic sludge (e.g., municipal sewage sludge, food processing sludge, biogas sludge). It aggregates fine sludge particles into filterable flocs, reducing sludge moisture content by 15–20% and improving dewatering efficiency (e.g., belt filter press throughput increased by 25%).
• Industrial Wastewater Clarification: Treats printing and dyeing wastewater (removes anionic dyes), electroplating wastewater (captures heavy metal complexes), and mining wastewater (settles mineral particles)—achieving 95%+ turbidity removal and meeting discharge standards.
• Drinking Water Purification: As a coagulant aid, it enhances the settling of algae and organic matter, reducing residual aluminum from traditional coagulants (e.g., polyaluminum chloride) and improving drinking water safety.

2. Papermaking Industry

• Retention and Drainage Aid: Adsorbs onto fine fibers and fillers (e.g., calcium carbonate, talc), reducing their loss in white water (fiber retention rate increased by 15–20%). It also accelerates water drainage from the paper web, boosting machine speed by 10%.
• Paper Strength Enhancer: Cross-links with cellulose fibers to improve paper’s dry tensile strength (by 10–15%) and burst strength, reducing breakage during printing and converting.

3. Oilfield Exploitation

• Crude Oil Dehydration: Acts as a demulsifier to break oil-water emulsions, separating water from crude oil (water content in crude oil reduced to <0.5%) and lowering pipeline corrosion risks.
• Drilling Fluid Additive: Stabilizes wellbores by flocculating drill cuttings, controlling fluid loss, and maintaining consistent viscosity—preventing wellbore collapse in high-pressure formations.

4. Personal Care & Textiles

• Cosmetics: As Polyquaternium-7, it is used in shampoos, conditioners, and styling products. It adsorbs onto negatively charged hair surfaces, forming a smooth protective film that reduces frizz, enhances shine, and improves combability.
• Textiles: Functions as an antistatic agent and dye fixative. It reduces fabric static by lowering surface resistance and improves dye fastness (by 1–2 grades) by binding anionic dyes to fibers.

5. Safety Information

1. Industrial-Grade Product Safety:
   • Low toxicity (oral LD₅₀ > 5,000 mg/kg in rats) and mild skin irritation. Wear gloves and goggles during handling to avoid direct contact; rinse with water immediately if skin/eye contact occurs.
   • Avoid mixing with strong oxidants (e.g., hydrogen peroxide) to prevent polymer degradation and gas generation.
2. Cosmetic-Grade Product Safety:
   • Cosmetic-grade Polyquaternium-7 is certified safe by FDA, EU CosIng, and China NMPA. It has a "0" comedogenic rating and no sensitization (per human patch tests), suitable for all skin/hair types, including sensitive skin.
3. Environmental Safety:
   • No ecotoxicity (algae EC₅₀ > 500 mg/L, daphnia LC₅₀ > 1,000 mg/L) and high biodegradability. It does not accumulate in soil or water, complying with EU REACH and U.S. EPA regulations.