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Silicone antifoam is also called silicone defoamers can ensure efficient and lasting effect and are very safe. Silicone defoamers, engineered to control and eliminate foam in industrial processes, are essential components in various applications. They work by reducing the surface tension of a liquid, which leads to the collapse of foam. These defoamers are highly effective at breaking down existing foam and preventing its reformation.
Amino Functional Trimethoxysilane
This product is a strong adhesion multifunctional Adherant adhesion promoter, which is a silane coupling containing amino functional groups. Designed for the coating and bonding requirements of specific magnesium, aluminum, iron, zinc and other composite metal materials and oxide coatings.
Isocyanate-Based Silane Coupling Agent
Used as cross-linking agent and adhesion promoter in coatings, inks and adhesives. Excellent wet adhesion properties are widely used on glass, metal and other inorganic substrates; it can also adhere well to organic materials that are difficult to adhere, such as nylon and other plastic products.
Sulfhydryl Functional Group Silane Coupling Agent
With the introduction of mercapto functional groups, it has a photopolymerization reaction of carbon-carbon double bonds, resulting in double cross-linking and curing with the resin system.
Heptadecafluorodecyl Trimethoxysilane
This product has extremely low surface tension and is used for self-cleaning of electronic coatings, automotive glass, ceramic marble, and other products. In the field of electronic displays, fluorosilane is used for anti-fingerprint, anti-glare treatment, and hydrophobic and oleophobic effects on surfaces such as glass or fabric fibers.
Reactive with amino, hydroxyl, carboxyl, epoxy and other multi-functional groups to promote adhesion and resistance to moisture and heat. It is equally effective in thermoplastic formulas and light-curing systems.
Titanate cross-linking agent can cross-link with active groups such as hydroxyl and carboxyl groups in substrates, inks, and coatings to form bridges and increase molecular weight, thereby improving heat resistance, chemical resistance, and water resistance.
High Transparency Acrylic Defoamer
Highly transparent acrylic defoaming agent is a kind of additive. This product is a large molecular weight acrylate polymer with high compatibility, does not produce shrinkage holes and does not affect inter-layer adhesion.
Gplus polymerization inhibitor is a classic phenolic polymerization inhibitor with white to light yellow crystals. All types of organic solvents and monomers have extremely high solubility.
It is a phenolic polymerization inhibitor with white to light yellow crystals. All types of organic solvents and monomers have extremely high solubility. Added to each polymer formula to maintain thermal storage stability and effectively inhibit viscosity increase, but does not affect photopolymerization efficiency.
Wide range of applications
Due to the special chemical structure of silicone oil, it is neither compatible with water or substances containing polar groups, nor with hydrocarbons or organic substances containing hydrocarbon groups. Due to the insolubility of silicone oil to various substances, it has a wide range of applications. It can not only use the water system to defoam, but also can be used in the oil system.
Low surface tension
The surface capacity of silicone oil is generally 20-21 dyne/cm, which is smaller than that of water (72 dynes/cm) and general foaming liquids, and has good defoaming performance.
Good thermal stability
Taking the commonly used dimethyl silicone oil as an example, it can withstand 150°C for a long time and 300°C for a short time, and its Si-O bond will not decompose. This ensures that the silicone defoamer can be used in a wide temperature range.
Good chemical stability
Because the Si-O bond is relatively stable, the chemical stability of silicone oil is very high, and it is difficult to chemically react with other substances. Therefore, as long as the formulation is reasonable, silicone defoamer is allowed to be used in systems containing acids, alkalis, and salts.
Physiological inertia
Silicone oil has been proven to be non-toxic to humans and animals, and its LD50 is greater than 34 g/kg. Therefore, silicone defoamer (with suitable non-toxic emulsifiers, etc.) can be safely used in the food, medical, pharmaceutical and cosmetic industries.
Strong defoaming power
Silicone defoamer agent can not only effectively break the foam that has been generated, but also can significantly inhibit the foam and prevent the formation of foam. It is used in a small amount, as long as it is added to one millionth (1ppm) of the weight of the foaming medium, it can produce a defoaming effect. The commonly used range is 1 to 100 ppm. Not only is the cost low, but also does not pollute the defoamed substance.
Types of Silicone Defoamer
Emulsion Silicone Defoamers
These are water-based and suitable for applications requiring easy dispersion.
Compound Silicone Defoamers
These are silicone oils combined with hydrophobic particles, providing robust defoaming in various conditions.
Powder Silicone Defoamers
Ideal for dry applications, these defoamers are mixed into powdered products to control foam during processing.
Effluent Treatment Plants (ETPs)
In wastewater treatment facilities, the control of foam is essential. Silicone defoamers are extensively used to manage foam generated during the treatment process, ensuring the smooth operation of ETPs.
Chemical Manufacturing
Chemical processes often involve the generation of foam, which can impede efficient production. Silicone defoamers are employed to eliminate foam in various chemical manufacturing applications, improving productivity and product quality.
Food and Beverage
The food and beverage industry faces challenges related to foam in processes such as brewing, fermentation, and food production. Silicone defoamers are crucial in preventing foam-related issues and maintaining product integrity.
Pharmaceuticals
In pharmaceutical manufacturing, precise control over the production process is crucial. Silicone defoamers help prevent foam formation during drug formulation, ensuring accurate dosing and product quality.
Pulp and Paper Industry
Foam can be a common issue in pulp and paper manufacturing, affecting paper quality and machine efficiency. Silicone defoamers are utilized to combat foam and ensure the smooth production of paper products.
Textile Industry
Textile processes, such as dyeing and printing, can lead to foam buildup. Silicone defoamers assist in managing foam, ensuring consistent and high-quality textile products.
Paints and Coatings
Foam in paint and coating formulations can lead to uneven application and reduced quality. Silicone defoamers are added to these formulations to maintain a smooth and even finish.
Agriculture
In agricultural practices like pesticide and herbicide application, foam can interfere with the effectiveness of the chemicals. Silicone defoamers are used to minimize foam formation, ensuring proper coverage and product efficacy.
Cosmetics
The cosmetics industry relies on precise formulations to create products with the desired texture and appearance. Silicone defoamers help manage foam in various cosmetic formulations.
Mining and Mineral Processing
Foam can be a challenge in the mining and mineral processing industry, affecting the efficiency of separation processes. Silicone defoamers aid in reducing foam and improving mineral recovery.
Oil and Gas
In the oil and gas sector, foam can hinder the separation of oil, gas, and water. Silicone defoamers are employed to control foam in production processes, ensuring efficient separation and product quality.
Construction
The construction industry utilizes silicone defoamers in various applications, including in concrete production and drilling fluids, where foam control is crucial for successful outcomes.
Key Differences Between Silicone Defoamer and Silicone Antifoam
Mode of Action
The fundamental distinction between silicone defoamers and silicone antifoams lies in their mode of action. Silicone defoamers primarily focus on eliminating existing foam by causing bubbles to burst, while silicone antifoams are designed to prevent foam formation in the first place.
Composition
Silicone defoamers typically contain non-ionic surfactants, which enhance their ability to reduce foam stability. In contrast, silicone antifoams are formulated to be effective in both aqueous and non-aqueous systems, making them versatile solutions for foam prevention.
Defoaming Activity
Silicone defoamers are renowned for their defoaming activity, breaking down foam efficiently, whereas silicone antifoams are exceptional at preventing foam buildup, especially in applications where foam control is essential.
Applications and Uses
Both silicone defoamers and silicone antifoams find applications in a variety of industries. Silicone defoamers are typically employed in the general industry and in effluent treatment plants (ETPs) to control foam in aqueous solutions. On the other hand, silicone antifoams are preferred for their versatility in preventing foam in both aqueous and non-aqueous systems.
The main active silicone defoamers are dimethyl silicone oil and silica, MQ resin is used with silica-dimethyl silicone oils defoamer system, generally the amount of resin added is 8%-12%. On the basis of the basic defoamer, MQ resin and silicone oil molecules and silica molecules generate a more stable structure to improve the bubble inhibition performance. And this extremely stable structure can improve the stability of silicone defoamers, improve acid resistance and high temperatures resistance. While improving the defoaming performance, the active ingredients of the dimethyl silicone oil silica system are protected from being destroyed by high temperature and acidity and alkalinity by this embedded break structure.
MQ resin is a raw material of antifoaming agents, which could be easily dispersed in the dimethyl silicone oils silica system to provide excellent defoaming properties, increase temperature and acid resistance of defoamer, and maintain the activity of active silicone ingredients. MQ resin can absorb and decompose organics, such as proteins organic matter, etc., making it work more effectively in many industries.
● Improve the high-temperatures resistance of defoamers.
● Improve the strong alkaline resistance of defoamers.
● Improve the defoaming performance of defoamers.
● High-performance silicone compound defoamers, it is recommended to add 8-12% MQ resin to silicone grease to significantly improve the defoaming performance of silicone antifoam.
Whenever we agitate the liquid or be introduced into the gas, many bubbles will be generated inside the surface of the liquid, and some bubbles generated by the liquid will quickly break and disappear. Some liquids not only do not disappear, but also gather more and form bubbles. Foam is a dispersion system formed by a large number of bubbles dispersed in a liquid. The dispersed phase is gas and the continuous phase is liquid. Among them, the volume fraction of the foaming liquid is very small, and the foam occupies a large volume. The gas is separated by a continuous liquid film, forming bubbles of varying sizes, which accumulate into foam.
The foaming medium is like a surfactant. A layer of surfactant molecules arranged in an oriented arrangement is adsorbed on the surface of the bubble. When it reaches a certain concentration, the bubble wall forms a solid film. The surfactant is adsorbed on the gas-liquid interface, causing the surface tension of the liquid surface to decrease, thereby increasing the gas-liquid contact surface, so that the bubbles are not easy to merge. The relative density of the bubbles is much smaller than that of the liquid itself. When the rising bubbles penetrate the liquid surface, they adsorb a layer of surfactant molecules on the liquid surface. Therefore, the bubble film with surfactant adsorbed in the air is different from the bubble film in the solution. It contains two layers of surfactant molecules to form a bimolecular film. The adsorbed surfactant protects the liquid film. effect. The organosilicon defoamer is to destroy and inhibit the formation of this film. The organosilicon defoamer enters the bimolecular-oriented film of the foam, destroys the mechanical balance of the oriented film, and achieves the foam breaking effect.
What Is the Dilution Method for Silicone Defoamer?
Silicone resin defoamer can be diluted at the moment of use, but the stability of the defoamer at the same time dilution will be sharply reduced as a result, such as the occurrence of delamination, so it is recommended to try to manipulate the thickening agent for dilution.
So silicone defoamer is not recommended to use water to open thinning, because if you use water to open thinning, it will break the viscosity system of the defoamer itself, if the control is not good, it will produce delamination, or even emulsion-breaking situation, such as this defoamer performance will be greatly reduced.
Silicone resin defoamer must pay attention to adjust the PH value of the system because the PH value will affect the true system of acidity and alkalinity, and later manipulation of the results, it is recommended that we use PH test paper to detect the acidity and alkalinity; then it is necessary to correct regularly if long time not corrected, it will lead to the measurement of the effectiveness of the inaccuracy and the measurement of the time to stir not evenly. If it is not even, the effect is not the same in different locations, and it will also be affected by the temperature.
Storage environment
Silicone defoamer should be stored in a dry, cool, and well-ventilated storage room. Avoid direct sunlight and high-temperature environments to prevent product quality damage.
Packaging containers
Silicone defoamers are usually supplied in sealed packaging containers (e.g., plastic bottles, buckets, or drums). When storing, it is needed to make sure the containers are intact and remain sealed to prevent moisture and impurities from entering.
Avoid mixing
Silicone defoamers should be kept stored separately from other chemicals to prevent mutual contamination or chemical reactions. It is needed to clear labeling and categorization in the storage area is recommended.
Prevent freezing
Some silicone defoamers may freeze or solidify at low temperatures. If the storage environment is expected to be exposed to low temperatures, measures should be taken to prevent icing and to return it to a liquid state if needed.
Caution about sources of ignition
Since silicone defoamers are usually flammable substances, storage areas should be kept away from open flames, high temperatures, and sources of ignition. It is needed to ensure that the storage area meets fire safety requirements and complies with relevant fire regulations.
Compliance
When storing and using silicone defoamers, follow local regulations and safety practices. It is needed to know the product's Safety Data Sheet (SDS) and follow the recommended safe handling procedures.
Periodic Inspection
Periodically inspect the storage conditions and packaging containers of the silicone defoamer to ensure that there are no leaks, damage, or deterioration. If any abnormality is found, appropriate measures should be taken promptly, such as replacing the container or consulting the supplier.
What Factors Affect the Performance of Silicone Defoamer?
The effect of viscosity and dosage of methyl silicone oil on the performance of silicone defoamer
Methyl silicone oils have low surface tension, strong defoaming ability, good thermal stability, chemical and physiological inertness, plus insoluble in water, and have excellent defoaming performance for most foaming media, this property can be used as a hot tub defoamer and spa chemicals. Therefore, we choose methyl silicone oil as the main component of silicone defoamers.
The effect of silicon dioxide selection and dosage
Fumed silica, precipitated silica, silica gel, silica sol, quartz powder, etc. Because the fumed silica-specific surface area is large, small in density, and easy to disperse, without hydrophobic treatment is hydrophilic, in the organic phase is difficult to infiltrate and dispersion, after hydrophobic treatment of the surface by the base content is reduced, the aggregation tendency is weakened, from hydrophilic to hydrophobic, and the organic phase of the infiltration, dispersion is improved, help to enhance the dispersion of silicone oil in the foaming system, increase the emulsion stability of the emulsion!
Effect of polyether silicone oil dosage
Polyether silicone oil itself has defoaming and foam inhibition properties, and can produce synergistic effects with methyl silicone oil/modified silica. Fixed other conditions, adding polyether silicone oil and changing its dosage, observing the defoaming performance of the defoamer, the experimental results: simple methyl silicone oil/silica emulsion defoaming effect is not the best. After adding polyether silicone oil, in a certain dosage range, with its dosage increases, the defoamer defoaming time becomes shorter and is conducive to extending the time of foam inhibition.
The effect of the compounding of emulsifiers and their dosage
Emulsifier is one of the key factors in the preparation of emulsion-type silicone anti-foaming agent methyl silicone oil is difficult to emulsify in order to make the emulsifier can play a good role in emulsification and dispersion, the first should consider the HLB value of the emulsifier and silicone oil HLB value (about 8-11) is close, followed by consideration of the emulsifier foaming force to be small, in addition to considering the emulsified system (non-aqueous systems) and the emulsifier water-repellent base of the affinity.
Our Factory
Shenzhen Youyang Technology Co., Ltd. is committed to the production, sales and promotion of high-quality chemicals around the world. We have the highest quality and comprehensive products in the field of UV radiation curing applications. Including Ultramodern cationic curing UV resin, special modified acrylate UV oligomer, Ciba cationic photo (thermal) initiator, Trust acrylate functional methoxy monomer, German BASF vinyl intermediate, Epochal epoxy curing agent, Thiol secondary polythiol and various silicone and fluorine additives.
Ultimate FAQ Guide to Silicone Defoamer
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