There are many types of polyether defoamer, mainly the following: Defoamer, also known as defoamer, is a food additive that reduces surface tension during food processing, inhibits foam generation or eliminates foam that has been generated. There are 7 kinds of defoamer permitted in China, such as emulsified silicone oil, high carbon alcohol fatty acid ester complex, polyoxyethylene polyoxyethylene pentaerythritol ether, polyoxyethylene polyoxyethylene amine ether, polyoxyethylene polyoxyethylene glycerol ether, polyoxyethylene polyoxyethylene glycerol ether and polydimethylsiloxane.
Silicon;
The most commonly used is polydimethylsiloxane, also known as dimethylsilicone oil. It has low surface energy, low surface tension, low solubility and high activity in water and general oil. Its main chain is the silicon oxygen bond, which is a non-polar molecule. It has no affinity with polar solvent water, and has little affinity with general oil. It is low volatile and chemically inert, relatively stable and less toxic. Pure polydimethylsiloxane can not be used as defoamer without dispersion treatment. It may be due to its high interfacial tension with water, low spreading coefficient, and it is not easy to disperse on the foaming medium. Therefore, the silicone oil is mixed with SiO2 aerosol, and the composite composed of SiO2 aerosol after hydrophobic treatment is mixed into dimethylsilicone oil, and it can be prepared after treatment at a certain temperature and for a certain time.
Silicone defoamer is made by mechanical emulsification of silicone grease, emulsifier, water repellent, thickener, 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; It also has physiologically inert LD250g/Kg mice and is commonly used in the food and pharmaceutical industries. It has the function of suppressing and breaking bubbles for all bubble systems, and belongs to the category of broad-spectrum defoamer. It 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 textile industry, it is used in the process of dyeing, scouring, sizing and other defoaming; In the chemical industry, it is used for defoaming in the process of synthetic resin, latex, paint, ink, etc. In the food industry, it is used for defoaming in various concentration, fermentation and distillation processes. The silicone grease can be applied to the wall of the pot, the outlet or on the metal net for defoaming. The solution of silicone grease can be used for oil phase system defoaming. A water emulsion composed of silicone grease and low viscosity silicone oil can be used for defoaming of various water phase systems. In medicine, it is usually used to remove gas from the organs or stomach organs before surgery, X-rays, and gastroscopy.
Defoamer can be roughly divided into two categories: one can eliminate the generated bubbles, such as ethanol; The other can inhibit the formation of bubbles such as emulsified silicone oil. The defoamer permitted in China is emulsified silicone oil, high carbon alcohol fatty acid ester complex, polyoxyethylene polyoxyepropylene pentaerythritol ether, polyoxyethylene polyoxyepropanolamine ether, polyoxyepropylene glycerol ether and polyoxyepropylene
RQ-X1 polyether modified silicone oil
Combining the advantages of polyether and silicone defoamer, it is non-toxic and harmless, harmless to bacteria, and the addition amount is very small, so it is a cost-effective product.


Second, divided into functions:
1, alkali defoamer
Under the condition of high temperature and strong alkali, the foam can be quickly defoamed and sustained. Good stability, less consumption, high efficiency, no oil bleaching; It is widely used in paper cooking black liquor treatment, strong alkali refining agent in textile printing and dyeing industry, cleaning agent under strong alkali conditions and other high temperature and strong alkali water phase system defoaming.
2, acid-resistant defoamer
Composed of fatty acid esters and fatty amides, it is widely used in the production of wet phosphoric acid, titanium, boric acid and other strong acid systems.
3, high viscosity foam defoamer
This product is an efficient compound defoamer developed for the foam produced by black liquor, chemical beneficiation and special chemical reaction, which has the characteristics of large viscosity, fine foam and difficult elimination.
4, paint defoamer
It contains a variety of high-quality defoaming ingredients, so it is suitable for a wide range of applications, especially for eliminating styrene-acrylic latex, ethylene-acrylic latex, pure propyl latex, vinyl acetate latex and other systems of foam.
5, paper defoamer
It can effectively control the overflow of pulp and foam and improve the quality of paper. Widely used in papermaking system defoaming, can also be used in papermaking wastewater treatment, antifreeze, distillation system defoaming.
6, cement mortar defoamer
It can effectively control the foam generation in the cement mortar system and make the concrete members more dense and bright.
7, oil field industry defoamer
It can effectively control the internal foam generation in the oil field industrial process and improve the oil production efficiency.
8, cleaning with defoamer
It can effectively control the foaming of the cleaning agent.
9, cation system defoamer
It can effectively control the generation of foam containing cationic system, and is widely used in paper making cationic rosin gum and cationic cleaning agent, and can also be used in papermaking sewage treatment, antifreeze and distillation system defoaming.
10, efficient fermentation defoamer
The disadvantages of poor high temperature resistance and short foam suppression time of conventional silicone defoamer are overcome. The foam accumulated in the fermenter can be eliminated as quickly as polyether, and this product has the advantages of time suppression that polyether cannot match.
11, water treatment defoamer
Silicone defoamer has strong functions of defoamer and defoamer for water-based foaming system. It is an ideal defoamer for water-based foaming system with small amount of addition and relatively low cost
Defoamer common sense
Bubbles are a common natural phenomenon that may not be unfamiliar to all of us. Such as cooking in daily life, under dumplings, cooking noodles, a little inattentive, you can overflow because of foam; In childhood play blowing bubbles, blowing colorful bubbles, floating all over the sky; The froth of beer spilled from a hastily poured glass; When the sea lashes against the shore, striking the reef on the shore to form a spectacular foam; There are also common soap and detergent liquid foam when people wash clothes; The foam produced by body washes and shampoos is all too familiar.
Although firefighters have cleverly used foam to put out some fires, pastry chefs have used the phenomenon of foam to make delicious breads, cakes and muffins for us, and a bottle of soda or beer on a hot summer's day can quench our thirst. Also such as foam flotation, foam metallurgy, foam printing and dyeing, foam printing, foam plastics...
Foam hazards
1, the production capacity is greatly limited: such as a variety of biological fermentation (beer production, alcohol manufacturing, pharmaceutical production of major antibiotics...) In various fermenter reaction kettle cooking tank and other equipment, in order to prevent the emergence of foam, to prevent the overflow loss, the feeding coefficient should be greatly reduced, sometimes less than 30%.
2, resulting in the waste of raw materials and products: due to the reason of foam, it can cause useful or valuable raw materials to overflow and loss, the resulting waste is self-evident. For example, the filling process of paper mills, sugar mills, and the oiling process of weaving processes in textile mills are often caused by foam overflow.
3, prolong the reaction cycle: because the chemical reaction products include gas and liquid, the foam will cause gas retention, prolong the reaction cycle, and unnecessarily consume more power. And if the wine fermentation overreacts due to the presence of foam and becomes stale... .
4, affect product quality: dyeing, printing and water-based coating process in the textile industry, due to the retention of bubbles, resulting in stains and defects on the finished cloth; In addition to causing harm to environmental health and workers' health, the foam of the pulp slurry will also appear many holes in the finished paper, resulting in a serious decline in product quality.
5, is not conducive to accurate measurement: in the industrial process, due to the existence of foam, interference with the accuracy of the liquid level meter, resulting in measurement errors, due to the existence of foam in the liquid, making the liquid density more dynamic, often can also cause the reaction tank absorption tower distillation tower liquid level virtual high, resulting in the operation out of balance, and even accidents.
6, pollution of the environment, one of the causes of the accident: due to foam overflow, it will inevitably pollute the production environment and its surrounding environment, and some even cause major accidents. For example, a refinery in the United States caused a major fire and heavy losses because of the spill of residual oil foam, which not only caused waste, but also caused serious losses of people's lives and property.
In addition, there are applications of new technologies such as high temperature spray dyeing and overflow dyeing on dyeing, which cannot be achieved without solving the problem of foam. For example, if the washing machine is now very popular, if it is not to solve the problem of non-foaming and low foaming of washing powder and detergent, then the washing machine can not be so popular. These are far from all the dangers of bubbles, but it is enough to see how serious they are.
In short, the existence of bubbles, affecting various sectors of the national economy, all aspects, if not well solved, it is no exaggeration to say that "bubbles" will become our obstacles, become some process "bottleneck". The good news is that there are good ways to deflate bubbles.