Polyacrylamide cation cation difference

Polyacrylamide according to ionic characteristics can be divided into "anionic, cationic, non-ionic and amphoteric", but polymer organic polymer properties can be divided into anionic and cationic. Although cationic polyacrylamide and anionic polyacrylamide are used in sewage treatment as flocculants, but in the effect and the basis is different.

What's the difference between an anion and a cation in polyacrylamide? What are the differences?

First, from the appearance of the difference

Both anionic and cationic polyacrylamide have white granules and emulsions. Usually the naked eye can hardly distinguish white particles, but the emulsion is different, anionic emulsion is white, and cationic emulsion is light blue.

Two, from the molecular weight difference

1. Anion molecular weight ranges from 4000000 to 25000000;

2, cationic molecular weight from 7 million to 12 million.

Three, from the index difference

1. Molecular weight and degree of hydrolysis are the main indexes of anionic polyacrylamide;

2, ionic degree and molecular weight is the main index of cationic polyacrylamide.

Four, the price difference

Anionic polyacrylamide price is lower than cationic polyacrylamide, and the higher the molecular weight, the higher the price.

Five, use difference

1, anionic polyacrylamide use

(1) Mainly used as flocculant: for suspended particles, they are coarser, higher concentration of particles, the pH value of water is neutral or alkaline sewage, because anionic polyacrylyl molecular chain contains a certain amount of polarity function to adsorb solid particles suspended in water, so that the bridge between particles to form large flocculant. Therefore, it can accelerate the settlement of particles in the suspension, and has a very obvious role in clarifying the return solution and promoting filtration. This product is mainly used for chemical wastewater, waste liquid treatment and other inorganic wastewater treatment; Municipal sewage treatment, tap water industry, high turbidity water purification, clarification, coal washing, mineral processing, metallurgy, iron and steel industry, zinc, aluminum processing, electronics industry and other water treatment.

(2) Anionic polyacrylamide is used in petroleum industry, oil recovery, drilling mud, waste mud treatment, waterproof, reduce friction resistance, improve oil recovery rate, tertiary oil recovery.

(3) Used for textile sizing agent, stable grout performance, less pulping, fabric break rate is low, smooth cloth surface.

(4) Used in paper industry, one is to improve the retention rate of fillers, pigments, etc. In order to reduce the loss of raw materials and environmental pollution; Second, improve the strength of the paper (including dry strength and wet strength). In addition, the use of PAM can also improve the tear resistance and porosity of the paper, thus improving the visual and printing performance of food and tea paper.

(5) As a kind of adhesive, can be used for incense making process, incense making beautiful appearance, high strength.

2, cationic polyacrylamide use

Acidic and alkaline media are positive, usually lower than anionic or non-ionic polyacrylamide molecular weight charge neutralization mainly to obtain the performance of clarifying sewage. The main function of flocculant is to flocculate with negative charge, with turbidity removal, decolorization function. Cationic polyacrylamide in alcohol, monosodium glutamate, sugar, beverage, printing and dyeing urban sewage in the organic wastewater treatment effect is anionic polyacrylamide, non-ionic polyacrylamide or inorganic salts several times or dozens of times, because this kind of wastewater generally has negative charge. Cationic polyacrylamide is suitable for high speed centrifuge, belt filter press, plate and frame filter press and other special sludge dewatering machinery. It has the characteristics of fast floc formation speed, large floc, good compression resistance, good shear resistance and easy separation from the press cloth. Therefore, the dehydration rate is high, the liquid content of filter cake is low, the dosage is small, which can greatly reduce the user's use cost. It can also be used for hydrochloric acid, medium concentration sulfuric acid and other liquids to separate and purify suspended substances.