What exactly is a silicone defoamer?
Silicone defoamer is a white, viscous emulsion. It has been used in various industrial fields since the 1960s, but its large-scale and comprehensive rapid development began in the 1980s. As a silicone defoaming agent, its application fields are also very wide, and it has attracted more and more attention from all walks of life. In chemical, papermaking, coating, food, textile, pharmaceutical and other industrial sectors, silicone defoamer is an indispensable additive in the production process. It can not only remove foam on the liquid surface of the process medium during the production process, thereby improving filtration, The separation, gasification, liquid drainage and other effects of washing, extraction, distillation, evaporation, dehydration, drying and other processes ensure the capacity of various materials holding and processing containers.
After the defoaming agent was adopted by people, people soon discovered that the operational efficiency and quality of manufacturing enterprises have been greatly improved compared to before due to the addition of defoaming agent. When used, it can quickly eliminate bubbles in liquid media, so silicone defoaming agents have been increasingly used in various industries in recent years.
Bubbles are a common phenomenon in our lives, but foam forms when a large number of bubbles gather and are continuously distributed in a liquid. A large amount of foam exists in life and production, which not only affects the normal progress of work, but also causes certain pollution to the environment, so eliminating foam is a very necessary task. Under normal circumstances, in order to quickly achieve defoaming, most companies will add defoaming agents for defoaming. However, there are many types of defoaming agents, so I will use silicone defoaming agents as an example to introduce silicone defoaming agents to you. Defoaming process and principle of foaming agent.
Organic silicon has a small surface tension. After the defoaming agent made of organic silicon is added to the foaming system, it can be quickly dispersed in it, and the surfactant molecules are directionally arranged on the surface of the bubbles. When the organic silicon defoaming agent reaches a certain When the concentration is high, when there are enough surfactant molecules, a thin film will be formed on the bubble wall and its surface tension will be reduced, thereby increasing the gas-liquid contact surface, ultimately making the formed bubbles less likely to merge and burst.
Since the bubble film exposed to the air has a bimolecular film structure, if you want to eliminate the foam, you must destroy and inhibit the formation of the film between the gas and liquid. Therefore, the added silicone defoamer must be able to quickly spread on the surface of the solution and enter the foam. The bimolecular oriented film destroys the mechanical balance of the film, thereby achieving the purpose of defoaming.
For general organic compounds, their spreading coefficients are very small and they are also inert in chemical properties. Therefore, pure silicone oil cannot be used as a defoaming agent. However, after emulsifying it to form a silicone defoaming agent, it can be used on the surface of the solution. Spread quickly, and use less amount to achieve a lot of good defoaming effects.
SHIBANG JIAMING RECOMMENDED PRODUCTS:
BZ-5600 Organic silicon defoamer
Composition：Modified polysiloxane compounds
Appearance: colorless transparent liquid
Active ingredient: 100%
Solvent: None
Application scope: used for roll coating, coating UV, epoxy, thick paint coating, baking paint, polyurethane materials.
Recommended dosage: Dilute the defoamer to 3-5% concentration and add 0.3-1.0%.
Directions:
Can be added at any time during the production process, including after adding, please mix well, please test before use.
Characteristics and advantages
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- good compatibility with most solvent-based coating systems;
- can prevent air bubbles caused by mechanical force during mixing, manufacturing and application.
- fast foam control ability, excellent defoaming and defoaming properties; can reduce fish eyes, pinholes, craters and other film defects.
Package: 25KG non-recycled blue pail.
Before the product is completely empty, the lid must be tightly closed after use.
Storage:
Keep away from heat and light source and keep away from light.
Precautions:
Please carefully evaluate the effect on compatibility and shrinkage before use.
The above information is based on the product, due to the producer’s formula, production process, construction conditions are different, the above statements are for reference only.
The company does not assume any legal responsibility, please test the dosage before use.
The company has the right to improve its own products, any changes in its specifications, without prior notice.
