FLOQUAT FL 4520 is a high-performance cationic polydiallyldimethylammonium chloride (Polydadmac) product, typically supplied as a high-solids liquid. It features high charge density, excellent water solubility, good stability over a wide pH range, and low toxicity, making it widely used in water treatment, textiles, papermaking, oil and gas, and other industrial fields. Its main functions include charge neutralization, flocculation, retention, decolorization, and surface modification, supporting both process efficiency and environmental compliance.
In municipal and industrial water treatment, FLOQUAT FL 4520 serves as a highly effective coagulant and flocculant aid. In drinking water treatment, it is often used in combination with inorganic coagulants such as aluminum or iron salts to enhance the aggregation of suspended solids, algae, and colloidal materials. This improves clarification efficiency, reduces sludge volume, and helps meet strict drinking water standards for turbidity and organic content. For industrial wastewater—especially from textile dyeing, printing, pulp and paper, and food processing—it acts as a powerful decolorizing agent by neutralizing anionic dyes and organic pollutants, significantly reducing color, COD, and suspended solids. It also performs well in oily wastewater treatment, destabilizing emulsified oils to facilitate oil-water separation. In sludge dewatering, FLOQUAT FL 4520 conditions biosolids by neutralizing negative surface charges, forming denser flocs that improve dewatering performance in filter presses and centrifuges, lowering final moisture content and reducing disposal costs.
The textile industry relies on FLOQUAT FL 4520 mainly as a formaldehyde-free fixing agent and antistatic agent. For dyed cellulosic fabrics such as cotton and linen, it forms ionic bonds with anionic dyes, improving wash fastness, crock fastness, and light fastness without affecting fabric hand or shade. As an eco-friendly alternative to traditional fixing agents, it meets international standards for low-formaldehyde or formaldehyde-free textiles, suitable for apparel and home textiles. Additionally, it reduces static buildup on synthetic fibers during spinning and weaving, preventing yarn breakage, dust adhesion, and processing disruptions, while improving process efficiency and product quality.
In pulp and paper manufacturing, FLOQUAT FL 4520 functions as a retention and drainage aid and anionic trash catcher. It increases the retention of fine fibers, fillers like calcium carbonate, and functional additives in the paper sheet, reducing material loss in white water and improving paper uniformity and strength. Enhanced drainage also accelerates dewatering on the wire section, boosting machine speed and reducing drying energy consumption. By neutralizing anionic trash from recycled pulp or mechanical pulp, it mitigates deposits, improves sizing efficiency, and supports stable production, particularly in recycled paper mills.
The oil and gas industry uses FLOQUAT FL 4520 as a clay stabilizer in drilling fluids and a treatment agent for produced water. It adsorbs onto clay surfaces in the formation, preventing hydration, swelling, and dispersion that can cause wellbore instability and formation damage. This stabilizes rheological properties and improves cuttings carrying capacity. In produced water treatment, it flocculates suspended solids and emulsified oil, enabling effective separation for reinjection or safe discharge, reducing equipment fouling and corrosion.
Beyond these sectors, FLOQUAT FL 4520 is applied in cosmetics and personal care as a conditioning agent, enhancing hair softness and antistatic properties. It also serves in mineral processing for selective flocculation and solid-liquid separation. Overall, its versatile cationic performance and environmental compatibility establish FLOQUAT FL 4520 as a key specialty polymer for sustainable industrial operations across global applications.
