Applications of FENNOQUAT 400 and FENNOQUAT 500 PolyDADMAC

FENNOQUAT 400 and FENNOQUAT 500 are two high-performance cationic poly(diallyldimethylammonium chloride) (PolyDADMAC) products, typically distinguished by molecular weight, charge density, and viscosity, tailored for industrial scenarios demanding precise flocculation, retention, and stabilization. With their strong cationic activity, excellent water solubility, and stable chemical properties, these two grades have become core additives in water treatment, papermaking, textiles, and mining, with each grade optimized for specific efficiency and application scenarios to meet diverse industrial needs. This overview details their applications across key sectors, totaling 888 words.

In municipal and industrial wastewater treatment, the primary application field, FENNOQUAT 400 and 500 exhibit targeted advantages based on their distinct properties. FENNOQUAT 400, featuring a moderate molecular weight and balanced charge density, is ideal for treating medium-turbidity wastewater, such as effluent from food processing, beverage production, and light chemical plants. As a coagulant aid paired with inorganic coagulants like polyaluminum chloride (PAC) or ferric sulfate, it neutralizes the negative charge on suspended colloids and organic particles, promoting the formation of dense, settleable flocs. This not only improves sedimentation efficiency by 20–30% but also reduces the dosage of inorganic coagulants, lowering residual metal ions in treated water to meet strict discharge standards. It also excels in sludge dewatering for municipal sewage sludge: by adsorbing onto sludge flocs, it enhances the structural strength of sludge cakes, reducing water content by 10–15% and improving the operational efficiency of belt filter presses and centrifuges, thus cutting sludge transportation and disposal costs.

FENNOQUAT 500, engineered with a higher molecular weight and ultra-high charge density, is designed for heavy-duty wastewater treatment scenarios, including high-turbidity mining wastewater, coal washing effluent, and printing-dyeing wastewater with high organic content. Its strong adsorption capacity enables it to capture fine, stable colloidal particles that are difficult to treat with conventional coagulants, forming large, fast-settling flocs to rapidly clarify wastewater. In membrane bioreactor (MBR) systems, it acts as a pre-treatment agent to remove colloids and organic matter that cause membrane fouling, extending membrane lifespan by 30–40% and reducing cleaning frequency. For industrial wastewater containing heavy metal ions, it can chelate with low-concentration heavy metals (e.g., Pb²⁺, Cd²⁺) and co-precipitate them, achieving dual effects of turbidity removal and heavy metal reduction. Both grades maintain stable performance in a wide pH range of 2–12, adapting to the fluctuating water quality of industrial wastewater and ensuring consistent treatment results.

In the papermaking industry, FENNOQUAT 400 and 500 serve as high-efficiency retention-drainage aids, pitch control agents, and strength modifiers, addressing key pain points in paper production. FENNOQUAT 400 is widely used in medium-to-large paper mills producing packaging paper, corrugated paper, and newsprint. By adsorbing onto negatively charged cellulose fibers, calcium carbonate fillers, and fine pigments, it increases the retention rate of fine particles by 15–20%, reducing raw material loss and lowering the chemical oxygen demand (COD) of papermaking wastewater. It also accelerates pulp drainage speed, improving the running efficiency of paper machines and reducing energy consumption during drying. As a pitch control agent, it neutralizes the charge of sticky pitch particles in mechanical pulp, preventing them from depositing on paper machine rollers and fabrics, thus reducing downtime for cleaning and maintenance.

FENNOQUAT 500 is tailored for high-end specialty paper production, such as coated printing paper, conductive paper, and food-grade packaging paper. Its high molecular weight enhances the inter-fiber bonding force, improving the dry and wet strength of paper by 25–30% without affecting paper surface smoothness. In coated paper production, it acts as a coating fixative, firmly adhering pigments and binders to the paper surface, enhancing printability and color fastness. It also functions as an antistatic agent, eliminating static electricity accumulation during high-speed printing and packaging, which is critical for ensuring the quality of high-precision printed products.

In the textile and dyeing industry, both grades are formaldehyde-free dye-fixing agents for anionic dyes (reactive, acid, and direct dyes), a key advantage in eco-friendly textile production. FENNOQUAT 400 is suitable for large-batch dyeing of cotton, linen, and polyester fabrics, forming stable cationic complexes with dye molecules on the fiber surface to improve washing fastness and rubbing fastness by 1–2 grades, meeting international textile standards like Oeko-Tex Standard 100. FENNOQUAT 500 is preferred for high-color-fastness textiles, such as outdoor clothing, upholstery fabrics, and industrial textiles, as its high charge density strengthens the binding between dyes and fibers, preventing color fading even under repeated washing or exposure to sunlight. They also act as antistatic agents during fiber spinning and weaving, reducing yarn breakage and improving fabric quality.

In mining and mineral processing, FENNOQUAT 400 aids in ore flotation by adjusting the surface charge of mineral particles, enhancing the separation efficiency of valuable minerals from gangue. FENNOQUAT 500 is used for tailings dewatering, accelerating the sedimentation of fine tailings particles and reducing the water content of tailings cakes to meet safe storage requirements. 

 

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