Reasons for deterioration of polyacrylamide and solutions:
Reason one: polyacrylamide as an organic polymer and polymer, with a positive gene group, because of strong flocculation adsorption, if the Yin humid place, it is easy to absorb moisture and form a block, especially some precipitation is relatively large, humid climate areas, especially easy to cause metamorphism.
Solution: polyacrylamide storage in a cool rather than damp place, at the same time indoor must maintain a certain amount of ventilation, if it rains must be strictly sealed, in short, do not contact with the liquid related to water.
Reason two: After the use of polyacrylamide, due to the busy work, a time to forget to open the polyacrylamide bag to hold up again, resulting in polyacrylamide absorption of water in the air and deterioration.
Solution: no matter when and where, as long as open the polyacrylamide packaging bag, immediately to wrap up, do not give the air a little chance, good airtight.
Reason three: the shelf life of polyacrylamide expired, although the use of polyacrylamide its shelf life is not the same, but the expiration of the shelf life, it is all invalid.
Solution: Any substance has a certain shelf life, in addition to the shelf life, then even if the protection measures to do again strict, it does not help, because in addition to the essence of the problem, outside followed by the affected, it is recommended not to buy too much polyacrylamide, soon run out to buy, do not put the polyacrylamide long-term in that.
Reason four: polyacrylamide did not have any problems, but after the successful configuration of polyacrylamide solution, more than 24 hours, that is, within 24 hours did not use the polyacrylamide solution.
Solution: Strictly speaking, as long as the successful configuration of polyacrylamide solution, it should be used immediately within a few hours, because the storage time after the configuration of the solution is limited, otherwise the hydrolysis of polyacrylamide reaction hand to the impact, it is recommended to use within 24 hours.
According to the expert research that the effective time of polyacrylamide is 1 year period, if more than this period, who please come over is useless, not only the loss of financial and material resources, and even may delay the construction period.
Correct preservation of polyacrylamide
The expiration date is the nature of all articles, and the same is true for water treatment agents. No matter it is solid or liquid, the expiration date has been passed, and the risk of failure is very high. So how do you tell if polyacrylamide is failing?
About polyacrylamide, different kinds of polyacrylamide, shelf life time is different. This has a lot to do with its structure, the period of validity of anionic polyacrylamide is about 2 years, the shelf life of cationic polyacrylamide is 1 year. If the expiration date is exceeded, the expiration date may be expired.
The storage environment of polyacrylamide has great influence on its shelf life. The shelf life of polyacrylamide can be extended in ventilated, dry and cool place. In high temperature and humid environment, polyacrylamide shelf life is relatively short.
In some areas, due to the humid climate, some sewage plants of polyacrylamide accumulation for a long time, packaging mouth is not strong, hygrophilic caking, for the caking of polyacrylamide flocculant, many people have questions about whether it is invalid. Therefore, the failure of polyacrylamide can be judged from two aspects. First, the viscosity is reduced, and the flocculation effect is poor when used.
The correct storage method of polyacrylamide:
1, polyacrylamide storage, should keep the environment closed, dry, avoid light, prevent high temperature, avoid moisture absorption, decomposition and deterioration.
2, the storage period of polyacrylamide should not be too long. Otherwise, it will lead to aging decomposition, generally the thinner the concentration, the shorter the validity period.
3, polyacrylamide flocculant and high metal ions are easy to produce insoluble gel, so it should not be stored in direct contact with metal containers for a long time.
Therefore, we are changing the storage environment of polyacrylamide. Temperature is an important factor. The storage temperature should be strictly controlled below 50 degrees to prevent direct exposure. Secondly, a small amount of stabilizer can be added to the polyacrylamide solution, such as sodium thiocyanate, thiurea, sodium nitrite and non-solvent methanol, to make the polyacrylamide solution stable.
Post time: Nov-15-2022