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Polyacrylamide

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  • 商品说明

Polyacrylamide (PAM for short) is one kind of line-type macromolecular polymer and one of water soluble polymer compounds widely applied. Polyacrylamide and its derivants can be used as effective flocculant, thickener, paper intensifier and liquid drag reducer, etc. and can be widely applied to the industries of water treatment, paper-making, petroleum, coal, mining and metallurgy, geology, light textile, construction, etc.
Product Specifications and Main Technical Indexes:

Name of technical index

PAMA Anion

PAMN Nonionic

PAMC Cation

PAMCA Compound ion

 

Appearance

 

White granule or powder

 

Grain diameter mm

< 2

 

Solid content %

≥88

Soluble speed min

≤1.5

Insoluble substance %

≤2

Molecular weight (ten thousand)

500-2400

300-600

300-800

800-1500

Hydrolysis degree %

13-30

5-15

ion exponent 5-50

10-20

Notes: Molecular weight is controlled in the range of the set index according to customer demands, and price is negotiable in accordance with market.
PAM Physical Properties and Use Characteristics
1. Physical Properties: 
Molecular Formula (CH2CHCONH2):
PMA is one kind of line-type macromolecular polymer, is freely soluble in water, and is hardly soluble in common organic solvents such as benzene, ethylbenzene, esters, acetone and the like. Its aqueous solution is nearly transparent and viscous liquid, and is relieved from dangers owing to non-toxic property and non-corrosiveness, and solid PAM has hygrocoicity which can increase with the ion exponent, and has excellent thermostability. It is excellent in stability after being heated to 100 DEG C, however, it is easy to decompose and generate nitrogen when being heated over 150 DEG C, and generates imidization effect among molecules and is insoluble in water, and its density is 1.302g/ml under 23 DEG C. Because its glass transition temperature is 153 DEG C, PAM expresses non-Newtonian flow under the stress effect.     
2. Use Characteristics 
1) Flocculation: PAM enables suspended matters to flocculate through charge neutrality and bridge adsorption effect.
2) Adhesiveness: It can play the adhesiveness effect through the mechanical, physical and chemical methods.
3) Drag reduction: PAM can effectively reduce the friction resistance of fluid, and 50-80% drag reduction can be achieved by adding trace PAM.
4) Thickening: PAM has the thickening effect both under neutral and acid conditions, is easy to be hydrolyzed when PH value is over 10 DEG C, and has obvious thickening effect when in semi-reticular structure.
3. PAM Working Principle:
1) Principle of flocculation: PAM is related to the kinds and surface properties of substances to be flocculated, in particular to potentiodynamic, viscosity, turbidity and PH value of suspension. Because the polymerization inhibition of granules is affected by the potentiodynamic on surfaces of granules, PAM with reverse surface charge can accelerate the reduction of the potentiodynamic and flocculate.
2) Bridge absorption: PAM molecule chains are fixed on the surfaces of different granules, bridges of polymers among granules, thereby enabling granules to form aggregates and then settle.
3) Surface absorption: Various absorptions of polar group granules on PAM molecules.
4) Strengthening effect: Dispersed phases are connected by PAM molecule chains through various mechanical, physical and chemical effects, thereby forming reticular structure and playing the strengthening effect.
Main Applications of PAM:
With high molecular weight and good water solubility, polyacrylamide (PAM) can adjust molecular weight and introduce various ionic groups to obtain specific performance. It can be used as effective conditioning agent or stabilizing agent when with low molecular weight, and important flocculant when with high molecular weight. 
It can make hydrophilic gel in which water cannot dissolve, and has good cohesion to many group surfaces and dissolved substances. Therefore, it is widely used in flocculation, thickening, drag reduction, gel, bonding, scale inhibition, and other fields.


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