Sinofloc Chemical

Amphoteric Flocculants

SINOFLOC amphoteric flocculants are partially hydrolyzed polyacrylamide with high molecular weight. This amphoteric polyacrylamide is easily to remove both the positive and negative charged contents particles in a suspension solution.

Amphoteric Polyacrylamide (PAM) Specifications


Product Code

Cationic Charge

Anionic Charge

Molecular Weight

Amphoteric PAM Powder





Amphoteric polyacrylamide also called zwitterionic polyacrylamide or dipolar ionic polyacrylamide. The molecular chain of the amphoteric flocculant has two or more functional groups, of which have at least one anionic charge and one cationic charge. Unlike other mono-ionic polyacrylamides that only form either a cationic or anionic charges, the amphoteric polyacrylamide simultaneously have both ionic states.

Amphoteric polyacrylamide is copolymerized by acrylic cationic monomer and acrylamide monomer. The anionic charge forms after the hydratization of the acrylamide monomer, and the cationic charge forms from the acrylic monomer. Thus, the amphoteric polyacrylamide has both positive and negative charges on its molecular chain.

Main applications of Amphoteric Flocculants

SINOFLOC amphoteric flocculants could be used for municipal wastewater treatment and industrial wastewater treatment. Our products have both anionic and cationic charges on the same macromolecule and could be used to remove both positively and negatively charged contaminant in suspensions.

1. Industrial water treatment
Amphoteric polyacrylamide has been widely used for industrial water treatment, oil refinery plants and mining etc. Amphoteric polyacrylamide has a better performance and efficiency than the mono-ionic polyacrylamide, especially when the water condition is complicated, or the water condition is keep changing, because its ability to decrease the surface tension of the water is way better. And the performance is stable when the water condition changes.
In some special cases, it usually needs to use anionic flocculants and the cationic flocculants synchronously to reach a better effect of the clarification, however, these added anionic flocculants and the cationic flocculants could react with each other and form precipitation and then lead a poor flocculate result. The amphoteric flocculants could easily avoid the problem due to its zwitterionic nature. It could create both charges without casing precipitation. And it’s even easier to operate during the treatment, time saving and labor saving.

2. Municipal water treatment
As the municipal waste water also has more and more complicated composition, the sludge dewatering requires a higher performance agent. At this circumstance, the simply cationic flocculants is not suitable any more, instead many tests and feedbacks show the amphoteric agent works very well.

3. Oilfield
The newly developed application is for the oilfield, facts prove that amphoteric polyacrylamide could be used for profile control, water plugging, friction reduction and also the treatment for the fluid.

Packaging - Storage

In 25 kg Kraft bags or PE valve bags or 750 kg big bags. The product should be kept dry place and the storage temperature is 0oC to 35oC, away from direct sunlight and moisture.

Products Feeding

The solutions of SINOFLOC amphoteric polymer must be prepared in suitable plants equipped with dry powders feeding and dispersion units and with continuous and moderate agitation. The dissolution water must have a temperature included between 10°C and 40°C; For a correct use of SINOFLOC amphoteric polyelectrolyte and in order to achieve the best possible results, it is necessary to allow a “maturation” time of 60 minutes. When treating turbid water, the flocculants solution must be added to the water in a point of average turbulence, in order to achieve a thorough and homogeneous mixing without impairing the flock formation. Recommend operating concentration is 3g/l, and the maximum operating concentration is 15g/l. For an optimum performance on specific applications on amphoteric flocculants, please consult with SINOFLOC team.

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What is the Charge Range of Sinofloc Amphoteric Polyacrylamide?
Sinofloc is supplying amphoteric powder flocculants with cationic charge of 5-10% and anionic charge of 20-30%.

What is the Main Characteristics of Sinofloc Amphoteric Polymer?
Sinofloc amphoteric polyacrylamide is formed by the acrylamide and cationic monomer. The product chain not only has the "carboxyl anion" after the hydrolysis of acrylamide, but also has a vinyl positive charge. Therefore, the amphoteric polyelectrolyte which has both positive and negative charges on the molecular chain is formed.
What's the Relationship between Amphoteric Polyacrylamide and Cationic/Anionic Polyacrylamide?
The amphoteric polyacrylamide (PAM) is not a mixture of anionic and cationic. If the cationic polyacrylamide bejing used in together with anionic polyacrylamide, the precipitation will be formed. Amphoteric polyacrylamide is a molecule containing both cationic and anionic groups.
What are Dissolving Tips for Sinofloc Amphoteric Flocculants?
The water to dissolve polymer should be clean not sewage, such as tap water. The water at the normal temperature will not need to be heated.
What's the Main Application for Amphoteric Flocculants?
Amphoteric Flocculants is widely used in sludge treatment like biochemical sludge and dehydration, industrial sewage treatment in EOR and dewatering of dehydrated organic sludge, organic sludge treatment in domestic sewage treatment plant, paper mill.
Can Amphoteric Polyacrylamide Be Used in Paper Industry?
This product could be used in the paper industry to improve the retention rate of filler and pigment and to reduce the loss of raw materials and pollution to the environment and to improve the strength of paper (including dry and wet strength). Moreover our Amphoteric Polyacrylamide could improve the paper tear resistance and porous, to improve vision and printing performance. Owing to its both cationic radical and anionic radical, it has superior performance in application of a wide range of pH value, with higher water filtration and lower water content in the bottom of the filter cake.
What's the Flocculation Principle?
When polyacrylamide used for flocculation, the polyacrylamide molecular chain is fixed on the surface of different particles, and the particles of each particle form a polymer bridge to make the particles form aggregates and settle. And charge group particles on the polyacrylamide molecule could have surface adsorption effect.
What's the Amphoteric Flocculants Application Feature for Sludge Dewatering?
As nature of city sewage discharge is become more complicated, the requirements for sewage sludge dewatering process is more and more critical. In some cases, single cationic polyacrylamide for some sludge dewatering could show perfect performance, and then amphoteric sludge dehydrating agent shows a better effect than the single ion characteristics of polyacrylamide through site testing. Especially, the sludge dewatering by amphoteric polyacrylamide being used in the sludge of refinery and chemical plant, has significant effect.
Could Sinofloc Amphoteric Flocculants Be Used as Water Plugging Agent?
Through various experiences and testing in local oilfields in China, Sinofloc amphoteric water plugging agent shows higher characteristics of the water plugging agent than the other single ionic flocculant.
How to Storage Amphoteric Polyacrylamide Well?
First, select a well-ventilated and dry warehouse, and to reduce the time of sunlight as the sun exposure will make polyacrylamide molecular weight degradation. Moisturizing polyacrylamide is easily to agglomerate and hard to dissolve as an aqueous solution during dissolution. If in a solution case, after the polyacrylamide dissolved in aqueous solution not used up, the remaining polyacrylamide solution should be filled with a lid seal to prevent dust from entering. The storage time of amphoteric polyacrylamide is 48 hours. The solution becomes thinner when the polyacrylamide solution is stored for an extended period of time. 
How is Sinofloc Service Team?
Sinofloc technical team could provide in-house testing and lab facilities to optimize products performance with the best combination of flocculants in your conditions. 
Sinofloc has the ability and experience to ship our flocculants to any port in the world. Door to door practice is also available.

Flocculation Precipitation

Flocculation precipitation is the process of flocculation and precipitation of particles in water. When feeding flocculants or coagulant in water, the colloidal and dispersed particles of suspended particles forms flocs under the interaction of molecular force, and they collide and flocculate in the process of sedimentation. The volume and quality of sedimentation increase and sink speed increases. The removal rate of suspended matter depends not only on the velocity of precipitation, but also on the depth of precipitation. 

Chemical Feeding  

Gravity feeding is to use the gravity to add the agent to the water suction pipe of the water pump or the water absorption well, and use the impeller of the pump to mix. Pressure feeding is to use water pump or water jet to put the chemicals into the original water pipe, which is suitable for putting the chemicals into the pressure water pipe, or we need to add them to the water purification structures with higher elevation and distance. Pump feeding is to use pump is to raise the liquid to the pressure tube in the solution pool. It has a direct use of the metering pump and the use of acid resistance to enhance the effect.
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