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Poly allylamine hydrochloride is a cationic polymer formed by the free-radical polymerisation of allylamine hydrochloride (monomer). Its defining characteristic is the presence of numerous protonated amino groups (-CH₂CH(CH₂NH₃⁺Cl⁻)-) within the molecular chain. The amino group (-NH₃⁺) reacts with carboxylic acids, acyl chlorides, epoxy groups, etc., enabling functionalisation modifications that combine water solubility, cationic adsorption properties, and biocompatibility. The methylene groups (-CH₂) in the molecular chain undergo cross-linking under high temperatures or ultraviolet light, forming insoluble gels. This makes polyallylamine hydrochloride a commonly used functional polymer material in industrial and pharmaceutical applications.
| Item | Specification |
| Melting point | 250–260°C |
| Boiling point | 55–58°C |
| Density | 1.05–1.10 g/cm³ (25°C aqueous solution); 1.20–1.25 g/cm³ (solid) |
| Viscosity | Low molecular weight approx. 50–200 mPa·s, high molecular weight up to 1,000–5,000 mPa·s (25°C, 20% aqueous solution) |
| Solubility | Freely soluble in water, methanol, ethanol; insoluble in non-polar solvents such as acetone and diethyl ether |
| Stability | Stable but highly hygroscopic. Incompatible with strong oxidising agents. |
Water treatment applications:
– Flocculant: Used in municipal sewage and industrial effluents (e.g., dyeing, papermaking wastewater) to form large flocs accelerating sedimentation and reducing COD;
– Scale inhibitor: Employed in circulating cooling water systems to prevent pipe scaling;
– Heavy metal adsorbent: Utilised in electroplating wastewater treatment (adsorption efficiency exceeding 95%).
Textile and Dyeing Industry:
– Fixing agent: Used in post-treatment for direct and reactive dyeing processes;
– Antistatic agent: Sprayed onto synthetic fibre fabrics (e.g., polyester, nylon) to reduce static charge accumulation.
Metal Surface Treatment
– Corrosion inhibitors: Employed for passivation after acid pickling of metals including steel, aluminium, and copper;
– Electroplating additives: Refine coating grain structure, enhancing gloss and adhesion (e.g., in zinc and nickel plating processes).
Pharmaceutical and Biotech Applications (Pharmaceutical-grade PAH)
– Drug carriers: Form complexes with negatively charged drugs (e.g., siRNA delivery) to reduce degradation rates;
– Sustained-release materials: Form microspheres with sodium alginate via electrostatic interactions; encapsulate drugs for controlled release;
– Antimicrobial coatings: Sprayed onto medical device surfaces (e.g., catheters, wound dressings).
Other Applications
– Pulp and paper industry: Used as wet strength agents to enhance wet strength in paper products (e.g., tissue paper, packaging paper);
– Electronic materials: Used as a cross-linking agent in photoresist preparation, or as a modifier for lithium-ion battery separators (enhancing ionic conductivity);
– Adsorbent resins: Employed for wastewater decolourisation and removal of pigments and odorous substances in the food industry.
Jinan Jinbang Chemical Co., Ltd., strategically located within the New Materials Industrial Park in Tianqiao District, Jinan City, Shandong Province, stands as a prominent chemical innovator since its establishment in 2015. Operating from a modern, expansive 37,500 m² manufacturing facility, we are dedicated to the research & development, production, and global distribution of high-performance chemical solutions.
We are always committed to delivering optimal chemical solutions for all application scenarios.
