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Foam has great influence on industrial production. In production, foam is needed for various reasons. In the process of using defoamer, we may encounter some problems. Let's analyze the problems in the use of defoamer one by one and find the right way to use it.
1、 Turbidity of defoamer
The main components of defoamer are hydrophobic particles, silicone oil and emulsifier. Hydrophobic particles adsorb silicone oil to maximize the effect of silicone in the case of as little as possible. Silicone oil is the main defoaming medium. Its surface tension is very small. It is neither oil nor hydrophilic. It suspends in the system and defoamer exists in the middle of the foam wall. The oil and water phase dissolves and the silicone oil has a small amount of consumption. When the silicone oil outside the hydrophobic particles is completely consumed, the foaming system will become cloudy. Therefore, the amount and color of hydrophobic particles, silicone oil and emulsifier used in defoamer are different, resulting in different properties of defoamer. When defoamer has a good defoaming effect and a long time, turbidity will not appear in the system.
2、 Time of bubble inhibition
The property of silicone oil in defoamer determines the antifoaming time of defoamer, the content of silicone oil determines the consumption cycle of defoamer in use, too little silicone oil will make the defoamer's antifoaming performance not reach the required value, too much silicone oil will affect the performance of defoamer, and at the same time reduce the defoamer's antifoaming performance; the particle size of defoamer determines the filter resistance of defoamer, and the particle size is too large It may cause defoamer to be easily filtered, produce bleached oil, and have an impact on foam inhibition; mixing time is also an important indicator of defoamer's foam inhibition ability, and insufficient mixing may lead to turbidity, bleached oil, weak defoaming ability, and shorter foam inhibition time.
3、 Failure problem
Acid and alkali stability; silicone oil can destroy the surface tension of the liquid, and eliminate the effect of foam. If the deacidity of the defoamer is poor, it will cause the decomposition of silicone oil, resulting in decreasing or even losing the ability of defoaming. The addition of silicate in the system will inhibit its decomposition. The dissolution of defoamer; some chemical components dissolve silicone oil into the system, so that defoamer no longer has defoaming effect, but as a surfactant in the system, the foam of the system is higher than that without adding defoamer.
4、 Defoamer classification
From the first generation of mineral oil defoamer to the second generation of polyether defoamer, the third generation of silicone defoamer, polyether modified polysiloxane defoamer, the types and application fields of defoamer are increasing, and the performance of defoamer is getting better and better.
5、 How to use defoamer
When choosing defoamers, try to choose manufacturers with brands. In this way, there will be less problems in the use of defoamer. According to the instructions given by the manufacturer, the best defoamer effect can be achieved by adding the defoamer according to the standard proportion.
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