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| Synonyms:Polyamine PDMDAEC DMA-EPI copolymer Dimethylamine-epichlorohydrin copolymer Molecular Formula:C5H12ClNO Molecular Weight: 137.60788 HS Code: 2923900090 Grade: Industrial grade，50%，60% Hazard Class:General Cargo | |||||||||
25988-97-0
bosschemical
25988-97-0
Poly(dimethylamine-co-epichlorohydrin), also known as dimethylamine-epiochloropropane copolymer (also called epichlorohydrin-dimethylamine copolymer, poly(dimethylamine-co-epiochloropropane), or polyamine, polyquaternium-2 (CAS No. 25988-97-0), is a cationic linear polyquaternium salt produced by the polycondensation reaction of dimethylamine and epichlorohydrin. It is one of the most important cationic polymeric flocculants in industry, and its structure can be simplified as follows:
[-(CH2CH(OH)CH2-N(CH3)2-)-]n (Polyquaternium-2, CAS No.: 25988-97-0, cationic linear polyelectrolyte)
It is typically a colorless to pale yellow, transparent, viscous liquid (aqueous solution), readily soluble in water, and possesses a high positive charge density. It maintains good performance in acidic, alkaline, and hard water environments. During use, it produces no foam, has no irritating odor, and is non-toxic. It exhibits extremely strong adsorption and bridging capabilities for colloidal substances. In industrial production, its flocculation performance is often enhanced by introducing a small amount of cross-linking agent (such as 1,6-hexanediamine) to increase its molecular weight.
From a molecular structure perspective, the copolymer backbone is densely distributed with quaternary ammonium cationic groups (-N+(CH3)2-). This "high charge density + linear long chain" structure enables it to neutralize negatively charged colloidal particles in water, aggregate and settle through adsorption bridging, and also to neutralize and adsorb negatively charged hair fibers, dye molecules and anionic substances. Therefore, it has become a "multi-talented" agent for flocculation, decolorization, sterilization and algae removal and daily chemical conditioning.
Chemically, this copolymer is a cationic polyelectrolyte with stable properties. It is compatible with inorganic flocculants such as polyaluminum chloride and can be used in combination with various water treatment agents. It is low in toxicity, but concentrated solutions can irritate the eyes and skin. Storage should be sealed, moisture-proof, and protected from high temperatures.
This product is categorized by application area, commonly including: industrial grade (for water treatment, papermaking, oil fields, and textiles; common specifications are aqueous solutions with approximately 50% solids content), daily chemical grade (polyquaternium-2, for hair and skin conditioning formulations), food processing aid grade (for use within the limits permitted by US FDA regulations), and reagent grade (for laboratories). Different grade products have different requirements for purity, impurity control, and residual monomer control, with particular emphasis on the following indicators:
1. Solid content
Solid content determines the dosage of active ingredients and the flocculation effect. The common specification for industrial grade is an aqueous solution of about 50%, which is the core indicator of product specifications.
2. Viscosity (molecular weight)
Viscosity reflects the molecular weight of the polymer. The higher the molecular weight, the stronger the adsorption and bridging ability and the better the flocculation effect. It is a key indicator for measuring the quality of a product.
3. cationicity
Cationicity reflects the density of positive charge, determines the charge neutralization capacity, and directly affects the effect on negatively charged colloids, dyes, and hair fibers.
4. pH value
pH value affects product stability and formulation compatibility, and must be controlled within the indicated range to ensure normal use in acidic, alkaline, and high-hardness water environments.
5. Free epichlorohydrin monomer content
Epichlorohydrin is a carcinogenic monomer, and the residual monomer content in polymers is a key safety indicator. The requirements are particularly stringent for daily chemical and food-grade products, and must be strictly controlled and tested regularly.
6. Heavy metal and impurity limits
Products classified as daily chemical products and food processing aids must control heavy metals and harmful impurities within regulatory limits to ensure safety in contact with and use on the human body.
7. Appearance and color
Appearance and color (APHA) reflect product quality and batch stability; the liquid must be colorless to pale yellow and transparent.
8. Solubility and Microbial Limits
The product must dissolve quickly and completely in water without leaving any gel residue; daily chemical grade products must also meet microbial limits to ensure the safety of cosmetic use.
This copolymer, with its unique structure of "high charge density + linear long chain", has a wide range of applications, spanning water treatment, papermaking, oil fields, daily chemicals, and food processing.
1. Water treatment flocculants (core application)
This copolymer is a cationic polymeric flocculant that helps neutralize colloidal charges , adsorb, bridge, coagulate, and settle, and remove suspended solids, turbidity, and COD. It is also commonly used as a coagulant aid for inorganic flocculants such as polyaluminum chloride.
（1）This copolymer is used as a polymeric flocculant and coagulant aid in drinking water treatment. It is often used in combination with polyaluminum chloride to help remove suspended solids and impurities from turbid river water. The tap water we drink every day may be indirectly involved in the purification process (the residue after treatment is extremely low and meets drinking water hygiene standards).
( 2 ) This copolymer is the main flocculant for municipal sewage and industrial wastewater treatment, which helps to remove suspended solids, reduce COD and color. It may be indirectly involved in the chain of our domestic sewage being discharged into rivers and lakes after treatment.
1. Dye wastewater decolorizing agent
This copolymer exhibits excellent charge neutralization and decolorization capabilities for anionic dyes such as reactive and disperse dyes, and is effective within a pH range of 2-10. It is a highly efficient flocculant for decolorizing dyeing and printing wastewater.
2. bactericide and algaecide
This copolymer is a non-foaming bactericide and algaecide used for algae control in swimming pools, whirlpools, landscape water features, and industrial circulating cooling water systems. It helps maintain water clarity and prevents scale buildup and clogging in pipes and heat exchangers.
3. Paper retention and filtration aids
This copolymer is used as a retention and filtration aid in the wet end chemistry of papermaking, helping to retain fibers, fillers and fine particles, improving paper strength, enhancing filtration performance and reducing white water load.
4. Oilfield chemicals
This copolymer is used as a demulsifier and oil-water separator for oilfield produced fluids, helping to break up and separate oil-water emulsions. It is also used as a treatment aid in drilling and oil production processes, serving the petroleum extraction and refining industry.
5. Rubber latex coagulant
This copolymer is used as a coagulant for synthetic rubber latexes such as styrene-butadiene rubber, helping latex particles to aggregate into rubber blocks. It is an important auxiliary agent in the post-processing of synthetic rubber.
6. Daily chemical conditioning agents (core applications in daily chemical products)
In daily chemical products, Polyquaternium-2 is used as a cationic conditioning agent and film-forming agent in shampoos, conditioners, hair dyes, and skin care products. It helps improve wet and dry combing performance, reduce static electricity, and increase shine and smoothness. It is one of the representative members of the polyquaternium family.
7. Food processing aids (for permitted uses)
Within the limits permitted by U.S. FDA regulations, this copolymer is classified as a food processing aid for use as a clarification and filtration aid in specific food processing techniques.
8. Reagent-grade laboratory applications
Reagent-grade products are used as cationic polyelectrolyte standards and research reagents in laboratories for flocculation mechanism research, water treatment agent screening, and polyelectrolyte performance characterization.
9. Other applications
With increasingly stringent environmental regulations and the development of green chemicals, the application scope of this copolymer continues to expand, including in areas such as wastewater treatment in mineral processing, sludge dewatering and conditioning, and cationic additives for water-based inks and coatings.
It should be noted that all grades and specifications do not equate to "risk-free": although the copolymer is low in toxicity, concentrated solutions can irritate the eyes and skin, and protective equipment should be worn during handling; epichlorohydrin is a carcinogenic monomer, and it is essential to control the residual free monomer in the product and to treat waste liquid in compliance with regulations; its biodegradability and environmental behavior are key areas of environmental concern.
Poly(dimethylamine-co-epichlorohydrin), or dimethylamine-epimylochloropropane copolymer (polyamine, polyquaternary ammonium salt-2, CAS No. 25988-97-0), is a cationic linear polyquaternary ammonium salt obtained by the condensation polymerization of dimethylamine and epichlorohydrin. It is typically a colorless to pale yellow viscous aqueous solution, and its "high charge density + linear long chain" structure spans multiple fields including industry, daily chemicals, and food processing. In daily life, we encounter it through shampoos and conditioners, tap water purification, swimming pool algae removal, sewage treatment, paper, printing and dyeing, and food processing. In applications, this copolymer is widely used as a flocculant in water treatment, a decolorizing agent for dye wastewater, a bactericide and algaecide, a paper retention and filtration aid, an oilfield demulsifier, a rubber latex coagulant, a daily chemical conditioning agent (polyquaternary ammonium salt-2), a food processing aid, and a laboratory reagent. It is a versatile polymer material that bridges "cationic polyelectrolyte chemistry" with "water treatment, papermaking, oilfields, daily chemicals, and food."
