Instructions for defoamer practitioners


The knowledge that defoamer practitioners should know


Defoamer is also known as anti-foam agent and defoamer; it is widely used in papermaking/pulping, textile, printing and dyeing, washing process, petroleum drilling, chemical industry, cleaning agent, cutting fluid, building materials, paint, ink, sewage treatment, food processing and other fields.


Foaming Reasons


1. Gas-liquid contact


2. Foaming AIDS


3. The foaming speed is higher than the bursting speed.


The above three factors determine the factors that affect the stability of foam, which are summarized as follows: bubble diameter, the type and concentration of the foam, the synergistic effect of surfactant, the viscosity of foaming solution, the permeability rate of gas, the compatibility of solute and solvent, temperature, surface charge, pH value and impact degree.






Defoaming method


The basic principle of defoaming method is to eliminate the cause of foaming, or to counteract or destroy the condition of stable foaming.


1. Eliminate the causes of foaming: When we can find out the causes of foaming, we should try to eliminate the causes of foaming, which is the fundamental measure of defoaming. A. Avoid unnecessary gas-liquid contact; B. Remove unnecessary foaming aids; C. Make the foaming speed higher than the foaming speed. A kind of


2. Physical method: A. changing temperature; B. changing pressure; C. using high frequency sound wave; D. using radiation.


3. Mechanical method: a. agitation; B. fluid injection; C. centrifugal bubble breaker; D. Gong bubble breaker; E. nozzle bubble breaker. A kind of


4. Chemical method: a. Adding surfactant of opposite type or substance that reacts with foam aid; B. Adding substance that can agglomerate or settle foam aid; C. Changing PH; D. Injecting vapor of low surface tension substance; E. Adding defoamer.






Suggestions for Choice and Purchase


1. First of all, we should distinguish the needs of customers; whether it is used in industrial production or in food or pharmaceutical production; pay special attention to the fact that the use of food and medicine requires a national certificate to be used, and there is no such strict requirement at the industrial level.


2. Make clear whether the system of defoamer needs to be applied is oily or water-based; water-based defoamer, oily defoamer.


3. the role of defoamer is to eliminate harmful foam in the system, and it can not have a negative impact on the material of the original system. This is very important.


4. Different industries will choose different defoamers, some industries silicone defoamers have good effect. Some industries reject organosilicon defoamers very much, or have no effect at all. Therefore, no defoamer is omnipotent, only the defoamer suitable for their own use is the best.


5. To know clearly the application of defoamers, whether there is high temperature, strong acidity, strong alkalinity or high shear force, etc., these factors will have serious damage to defoamers and make them lose effect quickly; if encounter the above application, we need to select some special defoamers. A kind of


6. The market of defoamers is relatively chaotic and the quality level of products is not uniform. Before mass purchasing, it is necessary to select defoamers after a small trial in order to avoid adverse effects and losses on their products and production.


7. Choosing the appropriate defoamer, the supplier's product quality stability is the premise; in order to avoid the instability of defoamer itself, which will affect production and cause significant economic losses.


8. Expensive defoamers are not necessarily good; however, those that are exceptionally cheap are certainly not good. Because manufacturers and distributors need survival and development, production and distribution have a lot of costs.


Defoamer is a commonly used additive in industrial production and daily life. I hope you can have a reference in learning about defoamer knowledge. Share the common problems in the use of Defoamers in the next period!


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