1. What are the reasons for the poor effectiveness of defoaming agents?
The purpose of using defoaming agents is to eliminate harmful foam produced in industrial production. , if a defoaming agent is added, but the defoaming effect is not good, and there is still a lot of foam, it means that the defoaming agent is not effective, so what is the reason why the defoaming agent does not have a good defoaming effect?
1. Failure to choose the appropriate type of defoamer
There are many types of defoamer, and different industrial production requires different types of defoamer. Choose according to production needs. If you choose the wrong defoaming agent, the defoaming effect will be greatly affected.
2. The defoaming agent particles are too small or too large
Some defoaming agents are adsorbed on the foam film in the form of particles. Broken, causing bubbles to perforate, burst or merge. When the diameter of this type of defoaming agent particles is similar to that of the foam film, the defoaming effect will be better. If the defoaming agent particles are too small and their particle diameter is smaller than the thickness of the foam film, it will be difficult for the particles to perforate and break the foam; if the particles are too large and move slowly, they cannot quickly gather at the air-liquid interface of the foam film to exert a defoaming effect. The activity will also become worse.
3. Improper temperature
The liquid temperature will also affect the performance of the defoaming agent. Some types of defoamer can only be diluted with lower-temperature solutions. When the temperature of the foaming liquid itself or the temperature of the water used for dilution is relatively high, it is easy to break the emulsion and affect the effectiveness of the defoamer.
4. Defoaming agent failure
The packaging and storage requirements and time range of defoaming agents should be strictly in accordance with product standards, otherwise the defoaming agent will deteriorate. Performance is reduced or fails.
5. The amount or timing of addition is wrong
The defoaming agent needs to be added in the right amount at the right time, otherwise it will easily cause waste of defoaming agent. , or insufficient defoaming power will affect the effect.
2. What kind of defoaming agent is effective
Defoaming agents are used in industrial production. In order to obtain better defoaming effects, it is necessary to Choose the appropriate defoamer. There are many types and ingredients of defoaming agents. Different types of defoaming agents are suitable for different industrial production systems. Therefore, it cannot be said arbitrarily which type of defoaming agent should be used.Foaming agents have the best effect. Maybe a defoaming agent that is useful in this field will not be useful in another field. However, generally a defoaming agent that can meet the following requirements is a useful defoaming agent:
1. It has strong defoaming ability and can effectively eliminate foam when using a very small amount.
2. It has a lower surface tension than the system to be defoamed.
3. The addition of defoaming agent will not affect the basic performance of the defoamed system.
4. It is insoluble in the system being defoamed and is not easily solubilized by surfactants in the system.
5. The surface tension balance should be better.
6. It does not react with the defoaming medium, nor will it be decomposed or degraded by it, and has good chemical stability.
7. It has good diffusivity and permeability, has a positive diffusion coefficient in the foam medium, and has the ability to spread quickly on the foam surface.
8. It has good heat resistance and will not lose effectiveness at high temperatures.
9. It has good gas solubility and permeability.
10. It has high physiological activity and safety in the defoamed system, and the defoaming agent itself is a non-toxic or low-toxic substance.
11. It has low chemical oxygen demand (COD), biochemical oxygen demand (BOD) and total oxygen demand (TOD).
12. It has good storage stability.
13. It has a long-term defoaming effect. Some defoaming agents can defoam quickly, but they will lose effectiveness over time.
14. Low cost.
15. Does not increase the surface viscosity of surfactant aqueous solution.
If the website content violates your rights, please contact us to delete it。
