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the chemical and physical properties of polyacrylamide
The name of technical indicators is PAM anionic,PAM cation of non-ionic PAM, PAM composite ion
Appearance White or light yellow powder
Particle size, mm <2
Solid content (%) ≥ 88
Dissolving speed (mim) ≤ 1.5
The insoluble matter (%) ≤ 2
Molecular weight (10 000) 500-2400 300-600 300-800 800-1500
Ion degrees of the degree of hydrolysis (%) 13-30 5-15 5-50 10-20
Note: according to user requirements, molecular weight control based on the market price in the range of indicators form Negotiable
2. The physical properties and characteristics of PAM
(1)Physical Properties: Molecular Formula (CH2CHCONH2) r
Structure of formula (CH2-CH0) n
PAM is a linear high polymer, it is soluble in water, almost insoluble in benzene, esters, acetone and other common organic solvents, its aqueous solution is almost transparent viscous liquid, non-dangerous goods, non-toxic, non-corrosive solid PAM hygroscopicity, the suction temperature increases with increasing ionic degrees, good PAM thermal stability, good stability was heated to 100oC, but 150oC more easily decomposed to produce nitrogen gas, occurs in the intermolecular imine of effect without water-soluble, density (g) the ml 23oC1.302. The glass transition temperature of 153oC, PAM under stress exhibit non-Newtonian flow properties.
(2)the characteristics of polyacrylamide
1) flocculation: PAM suspended matter can call in and through, the bridging adsorption from the flocculation.
3) reduction in resistance: PAM can effectively reduce the frictional resistance of the fluid, trace PAM can be added to the water 50-80% reduction in resistance
4) thickening: PAM had thickening effect in neutral and acidic conditions, pH values above 10oC PAM easy hydrolysis. The thickening was half mesh structure will be more obvious.
PAM role Principle Introduction
1) PAM used for flocculation, with the kinds of surface properties of the flocs, especially the dynamic potential, viscosity, turbidity, and suspension pH value, the zeta potential of the surface of the particles, particles polymerization reason to join the surface charge opposite PAM, liquid potential reduced cohesion.
2) adsorption bridging:
PAM molecular chain is fixed on the different surfaces of the particles, each particle is formed between the polymer bridges, and that the particles form aggregates and sedimentation.
3) surface adsorption
Various adsorption of the polar groups on the particles in the PAM molecules.
4) enhance the role of
PAM molecular chain and decentralized communication role of various mechanical, physical, chemical, and the dispersed phase implicated together to form a network, which in turn has enhanced the role.
PAM: polyacrylamide generated by the direct reaction of acrylonitrile with water in the skeleton copper catalyst via ion exchange polymerization drying processes that of finished craft Profile follows:
Raney copper catalyst
1, the catalytic hydration CH2 = CHCN + H2O humidity CH2 = CHCONH2
Figure: PAM process flow diagram polyacrylamide