What are the uses of polyacrylamide

The biggest use of polyacrylamide is water treatment. It is generally used in urban sewage disposal, paper industry, food processing industry, petrochemical industry, metallurgical industry, mineral processing industry, dyeing industry, sugar industry and various industrial wastewater disposal. It is used in sludge accumulation and sludge dewatering in the treatment process of municipal sewage, meat, poultry and food processing wastewater. Through its positive charge group, it can neutralize the negative charge organic colloid in the sludge and has excellent bridging and condensing function of polymer, so as to promote the adjustment of colloidal particles into large flocs and separate them from the suspension. The effect is obvious, the dosage is small. As a flocculant cationic polyacrylamide is mainly used in industrial solid-liquid process, including sedimentation, clarification, concentration and sludge dewatering skills. It can also be used for the water treatment of the water plant in the river water source.

Polyacrylamide used as additive in paper industry

In the paper industry, cationic polyacrylamide can be used as paper dry strength agent, retention aid and filter aid, which can greatly advance the quality of paper, save costs and advance the production of paper mills. It can directly interact with inorganic salt ions, fibers and other organic polymers to achieve electrostatic bridge effect to enhance the physical strength of paper, reduce the loss of fibers or fillers, accelerate water filtration, enhance, assist retention and assist filtration effects, and can also be used for the disposal of white water, together with obvious flocculation effect in the deinking process.

Fiber Industry

Fiber mud (asbestos-cement products) can improve the drainage of formed asbestos-cement products, so that the strength of the asbestos board blank is advanced; in the insulation board, the contact ability of additives and fibers can be advanced.

mining and mineral processing industry

In mining, coal preparation work can be used as mine wastewater, coal washing wastewater clarifier.

phosphonic acid purification

In the purification of phosphoric acid, contribute to the wet process of phosphoric acid in the skills of gypsum, respectively.

Application of Cationic Polyacrylamide in Papermaking

In the paper industry, when using waste paper to make paper, in order to maintain good tensile strength and other properties of the finished paper and meet the needs of modern rotary printing, polyacrylamide (CPAM) paper strengthening agent can be used. Its molecular length provides good adsorption performance and the position of binding with chlorine bonds, thus enhancing the binding between fibers, thus having various functions such as reinforcement, retention aid and filtration aid, especially improving the tear index, can effectively improve the strength of the paper.

The cationic polyacrylamide PAM made by adding acrylamide solution to modifier, sodium hypochlorite and alkali is mainly used to manufacture heat-resistant and water-resistant paper with PAM-type papermaking enhancer. For example, 0.5 parts of fatty acid sizing agent, 0.2 parts of PAM papermaking reinforcing agent, 1.0 parts of aluminum sulfate and 0.7 parts of epoxy reinforcing agent are mixed together and then added into chemical pulp to make paper. After soaking the paper in 200C water for 1h, the tear strength still reaches 183g, and the printing performance is good.

The copolymer of acrylamide, acrylic acid and hydroxyethyl acrylate grafted with ionic tapioca starch was added to 560ml of Canadian standard beating pulp, and Al2(SO4)3 was added to the paper with a quantitative of 74.2g/m2, with a breaking length of 8950m, an intermediate layer strength of 148g and a tear factor of 135.

When the vehicle speed is 800 m/min, the online concentration is 0.6, and the paper ash is divided into 20%, the first-pass retention rate of 80% and the first-pass retention rate of 50% can be achieved by using cationic polyacrylamide PAM papermaking retention aid.

As a retention aid for unit papermaking, the component is cationic polyacrylamide PAM, the general addition amount is 0.05-0.3, and the addition concentration is preferably 0.1-1.0; Dual retention aid, the component is PEI + PAM, the addition amount is 0.2-1.0, the addition concentration is 0.5-1.5. The addition method is that the two are premixed first and then added.

In the particle flocculation system, cationic polyacrylamide PAM is first added to form large flocs, and under the action of shear force, it is dispersed into small flocs, and then negative particle colloidal silicon is added, which can react with small flocs and be combined into a more dense and more easily dehydrated fine flocculation system, which can achieve higher retention rate, good uniformity and water filtration performance.

Cationic polyacrylamide PAM is used as retention aid for papermaking, with a retention rate of 98%. Lignin, fine fibers and cationic PAM in machine pulp are better than anionic polyacrylamide, showing strong retention aid. Polyacrylamide PAM is modified by rosin gum, gelatin, filler titanium dioxide, etc., which can be used as wet end additive.

Improvement of pulp dewatering performance with polyacrylamide PAM. In the process of copying, alum, polyacrylamide PAM and cationic starch are used successively to improve the retention effect and dehydration performance. The use of polyacrylamide PAM papermaking retention aid in printing coating base paper can improve the retention rate of fillers and fine fibers, speed up the speed of dehydration, precipitate sewage and reduce pollution, so it is of great significance to strengthen environmental protection and improve economic benefits.

Cationic polyacrylamide application method

1, the use of 0.1~0.3 concentration of polyacrylamide aqueous solution, to the use of neutral water without salt debris is appropriate.

2. When dissolving, the cationic polyacrylamide product is evenly sprinkled into the stirring water, and the stirring speed is controlled at 100~300rpm. Proper warming (< 60°C) can accelerate dissolution.

3. Adjust the PH value of the treated liquid to make this series of commodities give full play to the effect (select the best PH value and the dosage of this series of commodities through experiments.)

4. When participating in cationic polyacrylamide commercial solution, the mixing with the treated liquid should be accelerated. After flocs appear, the stirring speed should be slowed down to facilitate the addition of flocs and accelerate sedimentation.