Polydimethyldiallylammonium chloride (P-DADMAC) Technical Guide

polydimethyldiallyl ammonium chloride (P-DADMAC),the product isZhejiang Xinhaitian Biotechnology Co., Ltd.One of the core advantageous products.This comprehensive guide is designed for technical developers, purchasing managers and business owners to delve into the technical details of the high-performance cationic polymer, polydimethyldiallyl ammonium chloride (P-DADMAC).

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Technology Encyclopedia: Comprehensive Analysis of P-DADMAC

Polydimethyldiallylammonium chloride (P-DADMAC) is a cationic quaternary ammonium salt polymer with high charge density. Unlike many organic flocculants, it is completely free of formaldehyde and exhibits excellent stability over a very wide pH range.

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10 in-depth technical FAQs

1. How does the molecular weight (MW) distribution of P-DADMAC affect the capture efficiency of "anionic garbage" in papermaking?

Low molecular weight P-DADMAC can more effectively penetrate into fiber pores and neutralize dissolved and colloidal substances (DCS); while high molecular weight varieties show better retention of auxiliary agents.Zhejiang Xinhaitian Biotechnology Co., Ltd.Provide customized molecular weight distribution solutions to optimize the wet-end chemical environment for specific paper types.

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2. Can polydimethyldiallylammonium chloride maintain cationic charge density in high-salinity industrial wastewater?

Yes. Unlike the "chain collapse" that may occur in polyacrylamide (PAM) at high ionic strength, the quaternary ammonium ring structure of P-DADMAC is relatively rigid. It remains effective in high-salinity brines (up to 15% NaCl/CaCl ˇ), a key factor in the treatment of reinjection water in mines and oil fields.

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3. What is the synergy mechanism between P-DADMAC and inorganic coagulants such as PAC?

P-DADMAC is good at "charge neutrality", while PAC provides "sweep flocculation". When used together in the dual reagent system, the amount of PAC can be reduced by 30-50%, and the volume of chemical sludge produced can be significantly reduced.

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4. Why is P-DADMAC superior to Polyamines in NSF certified drinking water treatment?

P-DADMAC generally has lower residual monomer levels and greater chlorine resistance. As an NSF certification holder,Zhejiang Xinhaitian Biotechnology Co., Ltd.Ensure that residual monomer content is strictly controlled below the most stringent international thresholds.

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5. How does P-DADMAC affect the reduction of COD in textile printing and dyeing wastewater?

It specifically targets the hydrophobic organic components in dyes. By forming insoluble complexes with anionic dye molecules, P-DADMAC can remove up to 90% of chroma and 40-60% of soluble COD before the biological treatment stage.

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6. Will P-DADMAC react with free chlorine in treated water?

Compared with primary or secondary amines, P-DADMAC has extremely high resistance to oxidative degradation by chlorine or ozone. This makes it an ideal coagulant for pre-chlorinated water systems or swimming pool water treatment.

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7. How does the "ring formation efficiency" during the polymerization of dimethyldiallyl ammonium chloride monomer affect polymer performance?

Incomplete cyclization results in increased branching and decreased cationic charge density. As the drafting unit of the "T/ZZB 3886-2024" DADMAC standard,xinhaitianThe synthetic technology of our company ensures high-purity linear chains, resulting in better charge density and storage stability.

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8. Can P-DADMAC be used as a "conductive polymer" in specialty coatings?

Yes. Due to its high ionic conductivity, it is increasingly used as an antistatic agent in electronic packaging and as a conductive layer in specialty inkjet printing paper.

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9. What is the biological toxicity of P-DADMAC to aquatic organisms?

Although cationic polymers are toxic to fish at high concentrations, P-DADMAC is quickly adsorbed by suspended solids and organic matter in natural waters, which significantly reduces its bioavailability and environmental impact.

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10. How to adjust the dosing amount for pH fluctuations in printing and dyeing wastewater?

P-DADMAC is effective between pH 2 and 12. However, when removing vat dyes or sulfur dyes, a pH of 7 - 10 is recommended to maximize the precipitation effect of the dye-polymer complex.

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5 Industry Application Guides (How-to)

1. How to optimize AKD sizing efficiency in alkaline papermaking?

Technical difficulties: Anionic waste can interfere with the retention of AKD (alkylalkenyl succinic anhydride).
Strategy: Add 0.5 - 1.5 kg/t before AKDZhejiang xinhaitian P-DADMAC。It acts as a "cationic anchor", promoting the binding of AKD to the fiber and accelerating the curing process.

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2. How to achieve high-performance aldehyde free fixation of reactive dyes?

Technical difficulties: Traditional color fixing agents may affect light fastness or contain limited toxins.
Strategy: Dilute P-DADMAC to 5-10% working solution. For cotton fabrics, the padding process is used, and the amount is 10-30 g/L. It forms insoluble ionic bonds with dyes, significantly improving washing fastness without affecting the hand feel.

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3. How to manage clay stabilization in shale oil and gas drilling?

Technical difficulties: Water-based drilling fluids cause shale expansion, causing instability in the borehole wall.
Strategy: Add 0.2%-1.0% P-DADMAC to the mud system. The cation groups exchange cations between the layers of montmorillonite, thereby "locking" the clay sheets and preventing the hydration intrusion of water molecules.

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4. How to improve the sludge dewatering effect of municipal sewage plants?

Technical difficulties: Organic sludge is difficult to compress.
Strategy: P-DADMAC was used as the primary coagulant, followed by the addition of high molecular weight C-PAM (cationic polyacrylamide). This "double polymer" method produces larger, shear-resistant alum flowers and improves the clay biscuit quality after pressure filtration.

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5. How to choose the right P-DADMAC concentration in global trade to optimize logistics?

Strategy: For overseas procurement,Zhejiang Xinhaitian Biotechnology Co., Ltd.It is recommended to choose a high-concentration specification of 40% or 50%. This can significantly reduce the transportation volume and logistics costs per unit of active ingredient, provided that high-shear dilution equipment is available at the receiving end.

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Supplier Selection Guide: Why choose Zhejiang Xinhaitian Biotechnology Co., Ltd.?

For purchasing officers and business owners, selecting a polymer partner is a strategic decision. The advantages of New Haitian are:

• Upstream industrial chain integration: We are the leading countryMonomer dimethyl diallyl ammonium chloride (DADMAC)Manufacturers ensure the stability of raw material supply and cost advantages.

• Scale and foresight: The current design production capacity of P-DADMAC is 35,000 tons. With the completion of the new factory "Zhejiang Hailian New Materials", the group's total production capacity will reach 250,000 tons of various polymer fine chemicals.

• Compliance and Honor: As a national high-tech enterprise and specialized small and medium-sized enterprise, we hold ISO 9001/14001/45001 system certification and participate in the drafting of many industry standards.

• Customization capabilities: A full range of specifications from 10% to 60% are available to adapt to different climatic conditions and specific industrial needs.

• Product Main specifications (based on solid content) are:

• PDADMAC 10%

  PDADMAC 15%

  PDADMAC 20%

  PDADMAC 25%

  PDADMAC 26%

  PDADMAC 27%

  PDADMAC 30%

  PDADMAC 35%

  PDADMAC 40%

  PDADMAC 45%

  PDADMAC 50%

  PDADMAC 60%

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Frontier application outlook: The next frontier for P-DADMAC

The future of P-DADMAC lies in green chemistry and advanced functional materials:

• Nanocomposite membrane: P-DADMAC is introduced into RO/NF reverse osmosis membranes to give the membrane surface antibacterial and anti-biofouling characteristics.

• Solid electrolytes: Use its quaternary ammonium structure to develop ion conductive layers for next-generation solid-state batteries.

• Micro-plastic management: Highly charged P-DADMAC is used to coagulate and remove microplastic particles from secondary sewage effluent.