What is antifoam ?
A defoamer or an anti-foaming agent is a chemical additive that reduces and hinders the formation of foam in industrial process liquids. The terms anti-foam agent and defoamer are often used interchangeably. Strictly speaking, defoamers eliminate existing foam and anti-foamers prevent the formation of further foam. To choose the best floor scrubber, each of them should be evaluated separately by laboratory tests. The main features of the diffuser product are low viscosity and the possibility of its rapid spread on floor surfaces. It depends on the liquid level of the air and destabilizes the floor layers. This causes air bubbles to burst and the foam surface to disappear. Inlet bubbles shrink and larger bubbles rise faster to the surface of the liquid. Antifoam is a chemical additive also known as antifoam, diffuser or foaming agent that prevents foam or foam from forming. Be in liquids. The function of this material is such that it creates instability on the floor and eliminates the floor or small and large bubbles. To buy antifoam from Daneshmand production group, you can contact our sales experts.
Types of antifoam:
Anti-alcoholic foam
Silicone foam
Non-silicone foam
Antifoams are based on dimethyl siloxane, fatty acids and aqueous polymer emulsions.
Analysis of anti-foam types
| isd-100 | isd-200 |
| isd-300 | isd-400 |
| isd-500 | isd-800 |
| isd-1100 | |
MSDS of anti-foam types
| isd-100 | isd-200 |
| isd-300 | isd-400 |
| isd-500 | isd-800 |
| isd-1100 | |
History of antifoam:
The first defoamers were aimed at breaking down visible foam at the surface. Kerosene, fuel oil and other light oil products were used to break down foam. Vegetable oils also found some use. Fatty alcohols (C7 – C22) were effective but expensive antifoams. They were added to oil products to boost the efficiency. Milk and cream were forebears for modern day emulsion type defoamers.
During the 1950s, experiments with silicone based defoamers started. These were based on polydimethylsiloxane (silicone oil) dispersed in water or light oil. Silicone oils worked well, but caused surface disturbances in many applications like paints and papermaking. In 1963 the first antifoams with hydrophobic particles (hydrophobic silica) in light oil were patented. In the early 1970s, hydrophobic waxes like ethylene bis stearamide dispersed in oils developed. These types of defoamers were very efficient, but the oil crisis of 1973 made these too expensive and resulted in a push for reduction of the oil content. The solution was adding water. So water extended (water in oil emulsion) and water based (oil in water emulsion) defoamers appeared.
The development of silicone based defoamers has continued, using different emulsifiers and modified silicone oils. In the early 1990s, silicone emulsion defoamers that caused less surface disturbances were used in the wood pulping industry with great success. These caused better washing, reduced biological oxygen demand (BOD) in effluent and reduced deposits.
What is foam?
Stable dispersion of gas in a liquid, foam or foam is called air bubbles in liquids without surfactant. The worst foam is floating foam on the surface. The foam created on the surface may cause problems on the liquid surface and cause the desired tank or pool to overflow around the equipment, which is a safety concern.
Cause of foaming
The main cause of foam or foam is the entry of gas into liquid materials. Chemical reaction of foam-forming materials, such as isocyanate reaction with water, mechanical agitation due to mechanical air entry by stirring and mixing air circulation materials when pigments and fillers get wet.
property Defoamer
Effectiveness and efficiency
Less freight
Chemical stability
Non-toxic and environmentally friendly
Flash point high
Wide temperature range
High resistance oxidation
Stability in high pressures, deep wells, drilling and underground wells
Low steam pressure
Has high dielectric power
What is antifoam?
Generally a defoamer is insoluble in the foaming medium and has surface active properties. An essential feature of a defoamer product is a low viscosity and a facility to spread rapidly on foamy surfaces. It has affinity to the air-liquid surface where it destabilizes the foam lamellas. This causes rupture of the air bubbles and breakdown of surface foam. Entrained air bubbles are agglomerated, and the larger bubbles rise to the surface of the bulk liquid more quickly.
The reason of using antifoam?
The emergence of foam in various industries is one of the factors that will have a negative and declining effect on production efficiency. Floor production has many problems and has adverse effects on the industry. Therefore, the use of antifoam is essential. In general, foam is formed in the processes of food processing, chemical production, fermentation, textile industry, adhesive production, printing of ink, paint, coating and resin in mixing, filtration, dilution, filling of product containers, distillation and reflux . The emergence of foam in various industries reduces equipment efficiency and imposes high costs, so the necessary control and measures to eliminate this phenomenon are very valuable. In industrial processes, foams cause serious problems. They cause defects in the surface coatings and prevent the containers from filling efficiently. In addition, they reduce the rate of chemical reactions.
How antifoam works?
First, the antifoaming agent penetrates into the formed foam bimolecular liquid film, causing local surface tension of the liquid film decrease, due to the high surface tension around the liquid film, the liquid film is pulled, causing cracks.
Second: the anti-foaming agent intrudes into the single-molecule membrane of the air bubbles in the system, replacing some of its surfactant molecules. After the smaller foams are combined into big foams, the stability is greatly reduced, and it is difficult to stabilize itself.
Third: the defoamer molecules repel the fine bubbles in the system, making it difficult to adsorb other material in the system, constantly walks and merges in the system, and eventually floats on the page and breaks by itself.
Anti-foaming application:
Food processing
Production of chemicals
Fermentation, textile
Adhesive production
Printing ink
Color
Coating and resin
Sewage management
Suitable for deep wells
Drilling and underground environments
Excellent lubricant for O-rings
Suitable for producing gaskets
Excellent lubrication
Preparation of drilling mud
Distillation of crude oil
Asphalt production stages
Preparation and manufacture of paint
Oil production
Ceramic tile production lines
Water and wastewater treatment
Textile Industry
Ink printing
Antifreeze production
Wood and paper industries
Making glue
Alcohol production
Provision of sanitary ware
Manufacture of food and drug disinfectants
