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Polyacrylamide

PolyacrylamidePolyacrylamide production process: Acrylamide aqueous solution is used as a raw material, and polymerization reaction is performed under the action of an initiator. The polyacrylamide gel block generated after the reaction is cut, cut, granulated, dried, and pulverized.

According to ionic characteristics, it can be divided into four types: non-ionic, anionic, cationic and amphoteric.

Application

  1. Dehydrating silit
  2. Disposal of sewage and organic waste water
  3. Flocculant for water treatment in waterworks
  4. Oil field chemical
  5. Addictives for paper making

Use

  1. The use of polyacrylamide should follow the following principles:
    Granular polyacrylamide flocculant cannot be directly added to sewage. It must be dissolved in water before use, and its aqueous solution should be used to treat sewage.
  2. The water in which the particulate polymer is dissolved should be clean (such as tap water) and not sewage. Water at room temperature is sufficient, and generally no heating is required. Dissolution is slow when the water temperature is below 5 ° C. Increasing the water temperature will accelerate the dissolution rate, but above 40 ° C will accelerate the degradation of the polymer and affect the use effect. Generally tap water is suitable for formulating polymer solutions. Strong acid, strong alkali, high salt water is not suitable for preparation.
  3. The choice of polymer solution concentration is recommended to be 0.1% -0.3%, that is, add 1g-3g polymer powder in 1 liter of water.

characteristic

  1. Flocculation: PAM can make suspended matter through electric neutralization, bridging adsorption and flocculation.
  2. Adhesiveness: It can act as an adhesive through mechanical, physical and chemical functions.
  3. Drag reduction: PAM can effectively reduce the frictional resistance of the fluid. Adding trace PAM in water can reduce the resistance by 50-80%.
  4. Thickening: PAM has a thickening effect under neutral and acid conditions. When pH is above 10, PAM is easy to hydrolyze. With a semi-mesh structure, the thickening will be more pronounced.

Video

Technical index

NamePhysical properties
PolyacrylamideColorless or light yellow thick colloid, odorless, neutral, soluble in water, insoluble in ethanol and acetone, easy to decompose, flocculate, settle and strengthen when the temperature exceeds 120 ℃
Non-ionicThe macromolecular chain does not contain ionic groups, but amide groups and many substances, such as clay. Cellulose can generate hydrogen bonds. Flocculation due to adsorption bridge
CationicThe aqueous solution of this product is a polymer electrolyte. With a positive charge (active group). Can effectively coagulate suspended organic colloids and organic compounds, and can strengthen the solid-liquid separation process
AnionicIt has the characteristics of high polymer electrolyte in neutral and alkaline media and is sensitive to salt electrolytes. Can be combined with high-valent metal ions to form insoluble gels
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