What is the maximum molecular weight of anionic polyacrylamide?

1, anionic polyacrylamide overview

Anionic polyacrylamide (APAM) is a water-soluble polymer. Because its molecular chain contains a certain number of polar groups, it can adsorb solid particles suspended in water to bridge between particles or condense particles to form large flocs through charge neutralization. Therefore, it can accelerate the sedimentation of particles in the suspension, and has a very obvious effect of speeding up the solution clarification and promoting filtration.

Application: it is mainly used for flocculation settlement, precipitation and clarification treatment of various industrial waste water, such as iron and steel plant waste water, electroplating plant waste water, metallurgical waste water, coal washing waste water and sewage treatment, sludge dewatering. It can also be used for drinking water clarification and purification treatment.

2, anionic polyacrylamide main technical indicators

Appearance: white granule

Solid content: 89% or higher

Molecular weight: 18-25 million

High PH: 4 to 8

Charge density :10-40(Mole %)

Degree of hydrolysis: 15-35%

Dissolution time :≤50 minutes

Odor: odorless

Thermal stability: easy to decompose when the temperature exceeds 120℃

Toxicity: non-toxic

Corrosive: No corrosive

Hygroscopicity: solids have hygroscopicity

3, anionic polyacrylamide characteristics

1, water solubility is good, can also be completely dissolved in cold water.

2, add a small amount of anionic polyacrylamide products, can be subjected to a great flocculation effect. Generally, only 0.01~10ppm(0.01~10g/m3) is needed to give full play to the effect.

3, the use of anionic polyacrylamide products and inorganic flocculants (polyferric sulfate, polyaluminum chloride, iron salt, etc.), can show a greater effect.

Anionic polyacrylamide has the characteristics:

1. Clarification and purification effect;

2. Settlement promotion;

3. Promoting effect of filtration;

4, thickening and other effects.

4, anionic polyacrylamide use method

1, when used, with 0.1% concentration of water solution, to use neutral water without salt debris is appropriate.

2, when dissolved, anionic polyacrylamide products evenly scattered into the stirring water, stirring speed control at 100~300rpm. Proper heating (< 60°C) can accelerate dissolution.

3, adjust the PH value of the solution to be treated, so that anionic polyacrylamide products give full play to the role (through the test to choose the PH value and the amount of this series of products.)

4, the addition of anionic polyacrylamide product solution, should be accelerated with the mixing of the treated liquid, the emergence of flocculation, slow down the stirring speed, to facilitate the growth of flocculation and accelerated settlement.

5, anionic polyacrylamide use principle

The use of polyacrylamide should follow the following principles:

1, granular polyacrylamide flocculant can not be directly added to sewage. It must be dissolved in water before use, and its aqueous solution is used to treat sewage.

2, dissolved granular polymer water should be clean (such as tap water), not sewage. Normal temperature water can, generally do not need to add temperature. Dissolution is slow when water temperature is below 5℃. The dissolution rate increases with the increase of water temperature, but above 40℃ will accelerate the degradation of polymer, affecting the use effect. Generally tap water is suitable for preparing polymer solutions. Water with strong acid, alkali and high salt content is not suitable for preparation.

3, the selection of polymer solution concentration, Lebang suggested 0.1% - 0.3%, that is, 1 liter of water add 0.1g - 0.3g polymer powder.

6, anionic polyacrylamide matters needing attention

1, operators should wear protective equipment, skin contact, with water.

2, the use of the site, often with water to prevent slipping injury.

3, anionic polyacrylamide products should be sealed in a cool and dry place.

7, anionic polyacrylamide packaging, storage and attention:

Use 25Kg plastic lining woven bag or paper plastic composite bag packaging, also according to user requirements packaging.

When storing and transporting, pay attention to prevent heat and moisture to prevent package damage. Dry powder products will absorb moisture and agglomerate when exposed for a long time. Stacking layers shall not exceed 20 layers. Effective storage life is 2 years. The particle size of the product is 20-80 mesh, can also be produced according to user requirements.