The defoamer is composed of active ingredient, emulsifier, carrier and emulsifying agent, and the active ingredient is the core part of the defoamer, which plays the role of breaking bubbles and reducing surface tension.


The emulsifier disperses the active molecules into small particles and better disperses them into oil and water. It is a carrier that can play a better role in defoaming and occupies a large proportion in defoaming agents.


In addition, the surface tension of the emulsifier is not high, which mainly plays the role of the medium, which is conducive to suppressing the foam and achieving better defoaming effect, thus reducing the production cost.




Silicone defoamer






organic silicon defoamer (English name organic silicon defoamer) its main group is called silicone oil silicone components, silicone oil at room temperature is non-volatile oily liquid, insoluble in water, animal and plant oil and mineral oil, or solubility is very small, both high temperature and low temperature resistance. Chemical properties are inert, physical properties are stable, no biological activity.




01
Characteristics of silicone defoamer
Machine silicon defoamer is made by mechanical emulsification of silicone grease, emulsifier, water repellent, thickening agent, etc., with appropriate amount of water. It is characterized by small surface tension, high surface activity, strong defoaming power, less dosage and low cost. It is not miscible with water and most organic matter, and can defoamer most bubble media. It has good thermal stability, can be used in a wide temperature range of 5℃-150℃; Its chemical stability is good, difficult to react with other substances, as long as the configuration is appropriate, can be used in acid, alkali, salt solution, non-destructive product quality.






02
The advantages of silicone defoamer
(1) A wide range of applications: due to the special chemical structure of silicone oil, it is neither soluble with water or substances containing polar groups, nor is it soluble with hydrocarbons or hydrocarbon based organic compounds. Because of the insolubility of silicone oil to various substances, it is widely used, which can be used in both water system and oil system. (2) Small surface tension: the surface capacity of silicone oil is generally 20-21 dyne/cm, which is smaller than the surface tension of water (72 dyne/cm) and general foaming liquid, and the antifoam effect is good. (3) Good thermal stability: Taking the commonly used dimethyl silicone oil as an example, it can withstand 150 ° C for a long time, and can withstand more than 300 ° C for a short time, and its Si-O bond does not decompose. This ensures that the silicone defoamer can be used over a wide temperature range. (4) 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 preparation is reasonable, the silicone defoamer is allowed to be used in the system containing acid, alkali and salt. (5) Physiological inertia: silicone oil has been shown to be non-toxic to humans and animals, and its semi-lethal dose is greater than 34 g/kg. Therefore, silicone defoamer (in the combination of suitable non-toxic emulsifiers, etc.) can be safely used in food, medical, pharmaceutical and cosmetics industries.
(6) Strong defoaming power: silicone defoaming agent can not only effectively break the foam that has been generated, but also significantly inhibit the foam and prevent the generation of foam. Its use is very small, as long as the weight of the foaming medium is added one millionth (1ppm), that can produce antifoaming effect. Its common range is 1 to 100 PPM. Not only the cost is low, but also does not pollute the defoaming material.






03
Application of silicone defoamer in lubricating oil
Silicone defoamer is widely used in detergents, paper making, pulp, sugar making, electroplating, fertilizer, additives, wastewater treatment and other production processes. In the petroleum industry, it is widely used in the desulfurization of natural gas to accelerate the separation of oil and gas. It is also used to control or suppress bubbles in the drying of ethylene glycol, extraction of aromatic hydrocarbons, processing of asphalt, dewaxing of lubricating oil, etc. In the chemical industry, it is used for defoaming in the process of synthetic resin, latex, paint, ink, etc.
Silicone defoamer in the lubricating oil industry applications: such as internal combustion engines, automotive lubricants, metal working fluids, compressor oil, etc., when the use of silicone oil to add defoamer, because of the following advantages: A, insoluble in lubricating oil, in a dispersed state, is conducive to adsorption on the bubble film bubble breaking; B, there are similar to mineral oil alkyl, can squeeze into the bubble film, weaken the molecular gravity;
C, low surface tension, good penetration, adsorption on the surface of the bubble film to reduce the local surface tension, due to the surface tension of the bubble film is not uniform and burst. Heavy oil is selected with small viscosity silicone oil, and the addition amount is 1 ~ 10×10-6. In addition, alkyl polyacrylates are also better and have better gas release. Branched chain amine added to crude gasoline, naphtha, and then added to the lubricating oil, can also be used as a defoamer, adding a small amount of 0.05 ~ 1%, this defoamer can be added to the metal cutting fluid.


Polyether defoamer
Polyether defoamer is a non-ionic surfactant with excellent defoamer and defoamer function, odorless, non-irritating and easily dispersed in water, etc. It is one of the important varieties in defoamer products. Widely used in fermentation manufacturing antibiotics, vitamins and food processing, paper making, chemical industry, paint, building materials, detergents and other fields of defoaming. 01
Characteristics of polyether defoamer
① The defoaming performance and foam control performance of polyether defoamer are not as good as that of silicone defoamer, but the toxicity of polyether defoamer is very small, can be used for microbial fermentation, and can withstand high temperature, high alkalinity and high acidity. ② Silicone defoamer has good defoaming performance and foam inhibition performance, but it is not resistant to high temperature, nor acid, slightly alkaline, and can be used in water treatment and other fields. The use of polyether alone is not good, it needs to be used together, and polyether modified silicone defoamer, so polyether and silicone have many different places in common. 02
Main components of polyether defoamer
Polyether defoamer is composed of special modified polyether and fluorine containing raw material by special technology. According to these different auxiliaries, polyether defoamer can be divided into polyols, fatty acid lipids and amine ethers. These three different types of polyether defoamer have their own characteristics, colorless and transparent, defoaming fast, and foaming suppression long.
03
The defoaming principle of polyether defoamer
When the polyether is in contact with water, the temperature rises from the low temperature dissolved in water to the temperature of turbidity, which is its turbidity point. The foaming system will also exceed the temperature of the turbidity point with the temperature of the water, and the polyether defoamer will play its role at this time, which can quickly defoamer and control the generation of foam. Polysiloxane defoamer has the advantages of rapid defoamer, long time of defoamer, safety and non-toxicity, but it is insoluble in water, and has poor resistance to high temperature and alkali, while polyether defoamer has high temperature resistance and strong alkali, but its defoamer speed and defoamer time are not ideal. By condensation technology, polyether is linked to polysiloxane chain, which has the advantages of both defoamer and defoamer. It is a new defoamer with excellent performance and broad application prospect.


Polyether modified silicon defoamer


Polyether modified silicone defoamer is made by embedding polyether modified silicone oil in special functional group sealed siloxane molecule. And then block polyether, silicone, hydrophobic silica, emulsifier, stabilizer after high temperature emulsification made of emulsion defoamer. 01
Composition characteristics of polyether modified silicon defoamer
Polyether modified silicon defoamer is a kind of defoamer with good defoamer performance and wide application prospect. Polyether modified silicon defoamer is introduced into polysiloxane chain by condensation technology, which has the advantages of polyether and silicone defoamer. The polyether chain segment of polyether modified silicon can provide hydrophilicity and foamability, while the polyether chain segment of polyether modified silicon can provide strong hydrophobicity and high permeability, which has a strong effect on reducing the surface tension of defoamer.






02
Excellent properties of polyether modified silicon defoamer
Since the siloxane segment is an oleophilic group and the polyether segment is a hydrophilic group, polyether modified silicon defoamer can be used in both oily and water-based foaming systems, and can quickly eliminate foam and play its function of continuous foam suppression for a long time.
Polyether modified silicone oil defoamer, based on the previous generations of defoamer, tries to integrate the advantages of polyether and silicone, and introduces polyether chain segment into silicone oil chain segment, which has stronger defoamer and defoamer performance. Polyether modified silicone oil is a new type of special silicone surfactant, which is formed by addition reaction of polyether containing double bond and low hydrogen silicone oil. It is a kind of silicone non-ionic surfactant with unique properties, which not only retains the properties of silicone oil such as high and low temperature resistance, weather resistance, release property, hydrophobicity and physiological inertia. Polyether has the characteristics of non-irritant, high surface activity and easy dispersion. Polyether modified silicone oil is widely used because of its good heat resistance, shear resistance, acid and alkaline resistance, non-toxic, tasteless and stable storage.






03
Application range of polyether modified silicon defoamer
It is widely used for defoaming in high temperature dyeing process and fermentation process of polyester fabric. In addition, it can also be used for the defoaming of diethanolamine desulfurization system and the defoaming of various oil agents, cutting fluid, antifreeze, water-based ink and other systems, and it is also suitable for the defoaming of the printing industry after the photosensitive resin plate making, washing off the uncured resin. It is a representative, excellent performance and widely used defoaming agent product.
The difference between polyether modified silicon and polyether defoamer and silicone defoamer is that polyether modified silicon combines the advantages of polyether defoamer and silicone defoamer, and is non-toxic and harmless. Harmless to the strain, the amount added is very small. It is a cost-effective product. Polyether modified silicone is a polyether siloxane copolymer prepared from polyether chain segment of siloxane molecule (siloxane polymer for short).