What is the relationship between the solubility of cationic polyacrylamide and the specific dissolution time? Relationship between solubility and dissolution time of cationic polyacrylamide Source: Zhengzhou Tianhe Water Purification Time: 2014-03-25 Clicks: 5
Relationship between solubility and dissolution time of cationic polyacrylamide
Cationic polyacrylamides need to be dissolved prior to use. However, since the processes, methods, techniques, and processes for producing cationic polyacrylamide vary from manufacturer to manufacturer, the solubility and dissolution time of the cationic polyacrylamide produced on the market are also different, and there are differences.
Today, the Xiaobian of Zhengzhou Tianhe introduces in detail the relationship between the solubility of cationic polyacrylamide and the dissolution time. And tell everyone what is the normal dissolution time of cationic polyacrylamide, only for everyone to make a reference.
I. Overview of cationic polyacrylamide
Cationic polyacrylamide is a white powder granule with strong flocculation effect, so it is widely used in water treatment and metallurgy, papermaking, petroleum, chemical, textile, mineral processing and other fields. The cationic high-molecular flocculant is a linear polymer compound dissolved in water. The molecular weight is between 600 and 18 million. It can be dissolved in methanol and ethanol, and is insoluble in organic solvents such as ketones, esters and hydrocarbons. It is positive in the acidic or alkaline medium, which effectively flocculates and precipitates the sewage with suspended charges in the sewage.
Second, the solubility of cationic polyacrylamide
The solubility of cations is affected by many factors. The following are some of the conclusions of Zhengzhou Tianhe Xiaobian:
1. Molecular diffusion
The dissolution process of the substance is a process of mutual penetration and diffusion of the solute molecule and the solvent molecule, so the kinetic ability of the solute and the solvent molecule is an important factor affecting the solvent time. Since the solute molecules are much larger in size than the solvent molecules, the diffusion rates of the two are quite different. In the initial stage of dissolution, only water molecules diffuse unilaterally to the polyacrylamide, and polyacrylamide molecules are unlikely to diffuse in the direction of water, so swelling first is a necessary stage of dissolution.
2, hydrogen bonding and entanglement
Hydrogen bonds can be formed between the amide side groups in the molecular chain of the polyacrylamide and between the molecular chains. Hydrogen bond is the strongest intermolecular force. There are a lot of hydrogen bonds on the molecular chain of high molecular weight polyacrylamide. At the same time, the molecular chain of high molecular weight polyacrylamide is very long, and the long molecular chain must be curled and they aggregate. Together, they must be entangled together. Therefore, if the polyacrylamide is rapidly dissolved, it needs to rely on rapid infiltration and attack of solvent water molecules, net hydrogen bond dissociation and molecular chain untangling.
Third, the dissolution time of cationic polyacrylamide
Under normal circumstances, the dissolution time of the cationic polyacrylamide is within 60 minutes.
The amount of dissolution time is related to the dissolution rate of the cationic polyacrylamide with respect to its molecular weight, ionicity, molecular geometry, dissolution temperature, agitation and feeding mode.
The dissolution rate becomes slower as the molecular weight increases and the degree of chemical crosslinking increases, and the overall cross-linking will make the polyacrylamide first dissolved. In the manufacturing process of the powder, the high drying temperature and long drying time may cause partial or slight crosslinking of the product, and prolong the dissolution time and even partially insoluble matter. Some manufacturers have a very slow dissolution rate due to the immature production process, and there is a lot of insoluble matter after a certain time of dissolution.
The increase in dissolution temperature and agitation rate facilitates molecular diffusion and dissolution rate. However, higher dissolution temperatures (above 50 degrees Celsius) and strong agitation rates can degrade polyacrylamide and degrade performance. This is especially true for powder type products.
Zhengzhou Tianhe Water Purification Material Factory is a professional manufacturer of polyacrylamide (cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide, zwitterionic polyacrylamide). If you need help, please call, call, fax, QQ. , E-mail: [email protected]. We aim to provide you with better products and the most economical and reasonable solutions. Our technical experts are always ready to provide you with technical assistance and sincerely hope to establish long-term cooperation relationship with you!
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