Defoamer

Defoamer is an important chemical auxiliary, whose main function is to control and reduce the formation of bubbles and foam in liquid, so as to achieve the effect of eliminating or reducing foam. The following is a detailed introduction about defoamers:

Definition and Classification

• definition：Defoamer, also known as antifoam agent, foam inhibitor and defoamer, is a kind of surfactant, which can destroy the liquid film of foam and play a defoaming role. Due to its small dosage, it is also known as an efficient low foam surfactant or efficient low foam cleaner.

• classification：There are various types of defoamers according to different classification criteria. According to the form, it can be divided into five categories: solid particle type, lotion type, dispersion type, oil type and paste type; According to their applications in different industrial production, defoamers can be divided into textile industry defoamers, paper industry defoamers, coating industry defoamers, food industry defoamers, and petroleum industry defoamers; According to their chemical structure and composition, they can be divided into mineral oils, alcohols, fatty acids and fatty acid esters, amides, phosphates, organosilicon, polyether, polyether modified polysiloxane defoamers, etc.

Function and Characteristics

• Inhibit bubble formation：Defoamers can reduce the surface tension of liquids and hinder the process of gas aggregation and bubble formation in liquids.

• Destroy foam structure：For the formed foam, defoamer can destroy the stability of foam film, leading to the rupture and dissipation of foam.

• Improve liquid fluidity：The presence of foam will reduce the fluidity of liquid, and the use of defoamer can improve the fluidity of liquid, thus improving production efficiency.

• Prevent negative effects caused by bubbles：In some processes, the existence of bubbles and foam may cause a series of problems, such as reducing product quality, affecting the smoothness of the coating, interfering with the progress of chemical reaction, etc. The use of defoamers can prevent the occurrence of these negative effects.

application area

• industrial production ：In chemical industry, oil field exploitation, paper making, printing, dyes, coatings, plastics and other fields, a large number of foam will be produced in the production process. The use of defoamer can effectively reduce the production of foam and improve production efficiency.

• food processing：In food processing, such as beer, fruit juice, dairy products and other production processes will produce a large number of foam. The use of defoamer can reduce the production of foam, improve production efficiency, and ensure product quality.

• Pharmaceutical manufacturing：In pharmaceutical manufacturing, a large amount of foam will be produced in the process of mixing, stirring, filtering, etc. The use of defoamers can effectively reduce the production of foam and ensure the quality of drugs.

• consumer goods：In daily life, defoamers are also added to consumer products such as detergents, shampoos, shower gels, etc. to reduce the production of foam and improve the use effect.

Precautions for use

1. Stir thoroughly：Before use, lotion should be diluted reasonably, and then fully stirred to uniform.

2. Short term use up：In order to ensure the concentration of defoamer, it is necessary to use up the defoamer in a short period of time.

3. Prevent frost and high temperature：Defoamers can affect their performance under frost and high temperature conditions.

4. No shaking allowed：Strong vibrations can disrupt the stability of defoamers.

5. Appropriate viscosity：Maintaining an appropriate viscosity is necessary to fully utilize the performance of defoamers.

Types and characteristics

There are various types of defoamers, each with its specific chemical structure and properties. For example, organosilicon defoamers are currently the most widely used type of defoamers, with excellent defoaming effects and wide applicability. Non silicone defoamers are inexpensive, but in certain special industries such as strong acids and alkalis, special acid and alkali resistant non silicone defoamers are required. Polyether defoamers have excellent properties such as strong anti foaming ability and high temperature resistance, but they are also toxic and their usage conditions are limited by temperature.

conclusion

Defoamers are powerful and widely used chemical additives that play an important role in modern industrial production and daily life. Choosing and using defoamers correctly can not only improve production efficiency and ensure product quality, but also reduce costs and minimize resource waste.