Poly(diallyldimethylammonium chloride) (abbreviated as PDADMAC, CAS No. 26062-79-3) is a high-performance cationic polymer. Its core chemical structure is dominated by five-membered rings (with a relative molecular weight ranging from 4×10⁴ to 3×10⁶, offering higher practical value), and its molecular formula is (C₈H₁₆ClN)ₙ (where "ₙ" represents the degree of polymerization, so the molecular weight is not fixed). The product is normally a colorless to pale yellow, clear, and viscous liquid with no obvious odor. It belongs to the typical "polyquaternium-6" functional materials in the industry, featuring high charge density, easy solubility in water, and stable chemical properties, serving as a key additive in water treatment and special material modification fields.
It simultaneously achieves "charge neutralization" and "bridging flocculation" — it can neutralize negatively charged suspended solids and colloidal impurities in water, while adsorbing impurities through polymer chains to form large flocs. Its sedimentation rate is over 30% faster than traditional inorganic flocculants. With a molar fraction of cationic monomers ranging from 10% to 58%, it is compatible with water bodies with high, medium, and low impurity concentrations.
It has a pH tolerance range of 5.0-8.0 (at 25°C) and performs stably in weakly acidic to neutral water bodies, eliminating the need for additional pH adjustment of water quality. It is completely soluble in water and can be used directly after dilution, requiring no complex dissolution equipment, thus lowering operational thresholds.
It can be stored stably for a long time (12-month shelf life) when sealed in a cool place at room temperature, without the need for low-temperature or special environments. Compared with similar cationic flocculants, it has high utilization efficiency of active ingredients, reducing dosage by 20%-40% and cutting material costs.
In addition to core water treatment scenarios, it can be extended to fields such as biopharmaceutical cell separation and antibacterial modification of membrane materials. It can adapt to multiple scenarios without adjusting production processes, enhancing the reuse value of the product.
At 25°C, the density is stably 1.04 g/cm³ (for 20% aqueous solution), and the refractive index is 1.375, facilitating simple detection to determine product purity. Both boiling point and flash point are 100°C, consistent with the properties of water, eliminating concerns about high-temperature volatilization during use.
It is easily and completely soluble in water without residual precipitation; however, it has extremely low solubility in non-polar solvents such as acetone, facilitating solid-liquid separation in subsequent processes (e.g., crystallization in monomer purification).
It does not react with most common substances at room temperature, only needing to avoid strong oxidizing agents and metal materials (such as iron, copper, and aluminum) to prevent chemical reactions that affect performance. No special protection is required during daily storage and transportation.
Although it is irritating to the skin and mucous membranes of the eyes and nose, risks can be completely avoided with standard protective equipment (goggles, nitrile gloves). It is not classified as dangerous goods, requiring no special approval for transportation and use.
Municipal sewage treatment: Used for flocculation in the front section of sedimentation tanks to remove suspended solids and organic colloids from domestic sewage, stabilizing effluent turbidity below 5 NTU, and helping sewage meet discharge standards or realize reclaimed water reuse.
Industrial wastewater treatment: For wastewater from printing and dyeing, chemical, and food processing industries, it can efficiently remove dye molecules, oil colloids, and protein impurities. For example, the decolorization rate of printing and dyeing wastewater can reach over 85%, and the COD removal rate of chemical wastewater can be increased by 25%-35%.
Drinking water pretreatment: It can replace part of inorganic flocculants such as polyaluminum chloride, reducing sludge production (by 30%) and avoiding the risk of aluminum ion residue, thus improving the safety of drinking water.
Biopharmaceuticals: As a flocculant for CHO cells (Chinese Hamster Ovary cells), it facilitates the "centrifugation-free harvesting process" of monoclonal antibodies — after rapid flocculation of cells, separation can be achieved through filtration, which is 50% more efficient than traditional centrifugation processes without affecting antibody purity.
Membrane material modification: Through layer-by-layer self-assembly technology, it is compounded with graphene oxide to modify the surface of polyethersulfone ultrafiltration membranes, endowing the membranes with antibacterial properties, reducing bacterial adhesion rate on the membrane surface by over 60%, and extending membrane service life.
1. Engineer from a municipal sewage treatment plant: "We've been using this PDADMAC for treating domestic sewage for nearly a year. The turbidity of the effluent from the sedimentation tank has remained stable around 3 NTU. It uses less material than the polyaluminum chloride we used before, and the sludge volume has decreased significantly, reducing the cost of sludge treatment. It's also easy to operate — the workers mastered it quickly."
2. Production supervisor of a biopharmaceutical company: "After switching to this product in the CHO cell harvesting process, the filtration efficiency has improved significantly. It used to take 4 hours for centrifugation, but now filtration is completed in 1.5 hours. Moreover, the antibody purity is not affected, and the batch-to-batch stability is excellent with no quality fluctuations."
3. Printing and dyeing wastewater treatment service provider: "We used to worry about incomplete decolorization when treating reactive dye wastewater. After switching to this flocculant, the effluent is basically clear, and the customer acceptance passed at one time. It has been stored for more than half a year, and the product status is as good as new — its stability is really reliable."
Poly(diallyldimethylammonium chloride) (abbreviated as PDADMAC, CAS No. 26062-79-3) is a high-performance cationic polymer. Its core chemical structure is dominated by five-membered rings (with a relative molecular weight ranging from 4×10⁴ to 3×10⁶, offering higher practical value), and its molecular formula is (C₈H₁₆ClN)ₙ (where "ₙ" represents the degree of polymerization, so the molecular weight is not fixed). The product is normally a colorless to pale yellow, clear, and viscous liquid with no obvious odor. It belongs to the typical "polyquaternium-6" functional materials in the industry, featuring high charge density, easy solubility in water, and stable chemical properties, serving as a key additive in water treatment and special material modification fields.
It simultaneously achieves "charge neutralization" and "bridging flocculation" — it can neutralize negatively charged suspended solids and colloidal impurities in water, while adsorbing impurities through polymer chains to form large flocs. Its sedimentation rate is over 30% faster than traditional inorganic flocculants. With a molar fraction of cationic monomers ranging from 10% to 58%, it is compatible with water bodies with high, medium, and low impurity concentrations.
It has a pH tolerance range of 5.0-8.0 (at 25°C) and performs stably in weakly acidic to neutral water bodies, eliminating the need for additional pH adjustment of water quality. It is completely soluble in water and can be used directly after dilution, requiring no complex dissolution equipment, thus lowering operational thresholds.
It can be stored stably for a long time (12-month shelf life) when sealed in a cool place at room temperature, without the need for low-temperature or special environments. Compared with similar cationic flocculants, it has high utilization efficiency of active ingredients, reducing dosage by 20%-40% and cutting material costs.
In addition to core water treatment scenarios, it can be extended to fields such as biopharmaceutical cell separation and antibacterial modification of membrane materials. It can adapt to multiple scenarios without adjusting production processes, enhancing the reuse value of the product.
At 25°C, the density is stably 1.04 g/cm³ (for 20% aqueous solution), and the refractive index is 1.375, facilitating simple detection to determine product purity. Both boiling point and flash point are 100°C, consistent with the properties of water, eliminating concerns about high-temperature volatilization during use.
It is easily and completely soluble in water without residual precipitation; however, it has extremely low solubility in non-polar solvents such as acetone, facilitating solid-liquid separation in subsequent processes (e.g., crystallization in monomer purification).
It does not react with most common substances at room temperature, only needing to avoid strong oxidizing agents and metal materials (such as iron, copper, and aluminum) to prevent chemical reactions that affect performance. No special protection is required during daily storage and transportation.
Although it is irritating to the skin and mucous membranes of the eyes and nose, risks can be completely avoided with standard protective equipment (goggles, nitrile gloves). It is not classified as dangerous goods, requiring no special approval for transportation and use.
Municipal sewage treatment: Used for flocculation in the front section of sedimentation tanks to remove suspended solids and organic colloids from domestic sewage, stabilizing effluent turbidity below 5 NTU, and helping sewage meet discharge standards or realize reclaimed water reuse.
Industrial wastewater treatment: For wastewater from printing and dyeing, chemical, and food processing industries, it can efficiently remove dye molecules, oil colloids, and protein impurities. For example, the decolorization rate of printing and dyeing wastewater can reach over 85%, and the COD removal rate of chemical wastewater can be increased by 25%-35%.
Drinking water pretreatment: It can replace part of inorganic flocculants such as polyaluminum chloride, reducing sludge production (by 30%) and avoiding the risk of aluminum ion residue, thus improving the safety of drinking water.
Biopharmaceuticals: As a flocculant for CHO cells (Chinese Hamster Ovary cells), it facilitates the "centrifugation-free harvesting process" of monoclonal antibodies — after rapid flocculation of cells, separation can be achieved through filtration, which is 50% more efficient than traditional centrifugation processes without affecting antibody purity.
Membrane material modification: Through layer-by-layer self-assembly technology, it is compounded with graphene oxide to modify the surface of polyethersulfone ultrafiltration membranes, endowing the membranes with antibacterial properties, reducing bacterial adhesion rate on the membrane surface by over 60%, and extending membrane service life.
1. Engineer from a municipal sewage treatment plant: "We've been using this PDADMAC for treating domestic sewage for nearly a year. The turbidity of the effluent from the sedimentation tank has remained stable around 3 NTU. It uses less material than the polyaluminum chloride we used before, and the sludge volume has decreased significantly, reducing the cost of sludge treatment. It's also easy to operate — the workers mastered it quickly."
2. Production supervisor of a biopharmaceutical company: "After switching to this product in the CHO cell harvesting process, the filtration efficiency has improved significantly. It used to take 4 hours for centrifugation, but now filtration is completed in 1.5 hours. Moreover, the antibody purity is not affected, and the batch-to-batch stability is excellent with no quality fluctuations."
3. Printing and dyeing wastewater treatment service provider: "We used to worry about incomplete decolorization when treating reactive dye wastewater. After switching to this flocculant, the effluent is basically clear, and the customer acceptance passed at one time. It has been stored for more than half a year, and the product status is as good as new — its stability is really reliable."
