Definition: Polymer with repeating unit - [CH2CHCONH2] n-. It is a water-soluble polymer. It can be used as a wastewater treatment additive.
Subject: Materials Science and Technology _ Polymer Materials _ Plastics
Related terms: water treatment, flocculants, thickeners
Polyacrylamide is a linear polymer polymerized from acrylamide monomer. It has good thermal stability and can be dissolved in water in any proportion. The aqueous solution is a uniform and transparent liquid. It is one of the most widely used varieties of water-soluble polymers.
Polyacrylamide products are of the following four types: one is cationic polyacrylamide, which is mainly used for wastewater treatment with high organic colloid content, especially sludge dewatering treatment in industries such as urban sewage, urban sludge and papermaking sludge; the other is anionic polyacrylamide, which is mainly used for flocculation and sedimentation of various industrial wastewater, such as wastewater treatment from steel mills, electroplating plants, metallurgical wastewater, coal washing wastewater, etc.; the third is non-ionic polyacrylamide, which is mainly used for precipitation and clarification treatment of various industrial wastewater, such as pulp wastewater treatment, wastewater treatment from mineral processing processes, wastewater treatment from stone processing plants, etc.; the fourth is amphoteric polyacrylamide.
Mainly used as a flocculant.
Polyacrylamide is widely used in water treatment, petroleum extraction, papermaking, textiles, medicine, agriculture and other industries. According to statistics, 37% of the world's total production of polyacrylamide is used for wastewater treatment, 27% is used in the petroleum industry, and 18% is used in the paper industry. The application in the field of water treatment is a flocculant for water treatment, especially for the flocculation of protein and starch in water, which can improve water quality, increase the strength and sedimentation rate of flocs, and slow down the corrosion and scaling of circulating cooling systems.
In raw water treatment, it can be used in combination with activated carbon to agglomerate and clarify suspended particles in domestic water, which can improve the water purification capacity by more than 20%. In sewage treatment, the use of polyacrylamide can improve the utilization rate of wastewater reuse. It is an important formula agent in industrial water treatment.
The application of polyacrylamide in the field of petroleum production is as a lubricant, suspending agent, thickening agent, oil displacement agent, water loss reducing agent and clay stabilizer. It is widely used in drilling, acidification, fracturing, water plugging, cementing and secondary oil recovery. It is an extremely important oilfield chemical. China's petroleum industry is the largest user of polyacrylamide. The scientific and technological progress of polyacrylamide has promoted the development of China's petroleum industry. The demand of the petroleum industry has accelerated the pace of technological innovation and the development of the industry of polyacrylamide.
Polyacrylamide is mainly used in two aspects in the papermaking industry. One is to improve the retention rate of fillers, pigments, etc. to reduce the loss of raw materials and pollution to the environment; the other is to improve the strength of paper. Polyacrylamide is widely used in the papermaking field as a retention aid, filter aid and leveling agent to improve the quality of paper, slurry dehydration performance, retention rate of fine fibers and fillers, reduce raw material consumption and environmental pollution. When used as a dispersant, it can improve the uniformity of paper.
Polyacrylamide also has excellent properties such as thickening, shear resistance, drag reduction, and dispersion. It can be used as a soil conditioner to increase soil water permeability and moisturization. It can be used as a chemical grout agent for plugging tunnels and dams in civil engineering. It can be used as a fiber modifier to improve the physical properties of synthetic fibers. When used as a preservative, it can be used for anti-corrosion of underground components. In addition, it can also be used as an additive in the food industry, a dispersant for pigments, and a paste in the printing and dyeing industry.