Antifoam compounds, silicone

Silicone fluids per se have both antifoam and defoaming attribntes, they can be modified by reaction with silica to make significantly more efficient antifoam compounds. Silicone-based antifoam compounds for use in detergents are composed of two major components silicone fluid and hydrophobic silica. The fluid polymer acts as a carrier to deliver the silica particles to the foam air-water interface, where film rupture then occurs. 

Stainless steel is used in critical areas where hot carbon dioxide-laden solutions are present. It is reported that antifoam agents (silicones) are used in some cases with this process . Some pressurized wash processes also use diglycolamine to remove sulfur compounds and COj 6. 

The most widely used in foam control are special materials called antifoams. They could be fats, oils, waxes, fatty alcohols and acids, ethers, organic compounds containing nitrogen and sulphur (alkylamines and amides, sulphides, thioethers, etc.), phosphorus organic compounds (in particular, tributylphosphate), silicon-organic compounds (silicon oils) and some non-ionic surfactants [e.g. 4,5]. 

A 100% active siicone antifoam compound. May be emulsified to prepare stable silicone defoaming and antifoaming agents for all applications. 

Three new silicone antifoam compounds with optimized polymer structures and viscosities ranging from 26 000 to 100 000 mPa.s were compared with conventional silicone antifoams. 

Antifoam compounds. Dow-Coming Corp. offers two 100% silicone compounds for nonaqueous foaming systems, A and Q, which are effective in concentrations of 1-50 ppm. and 0.1-150 ppm. Thus one small drop of Q stops foam in a whole gallon of liquid. Antifoam B, C, and H-IO emulsions (pH 6.5, 3.9, and 4.0) contain 10-30% active defoamer and are useful for control of aqueous foaming systems. 

Silicone Antifoam Agent S 203, Silicone Antifoam Agent S 204, Silicone Antifoam Agent S 370, Silicone Antifoam Agent S 670, Silicone Antifoam Agent S 860 Silicone Antifoam Agent S 882 Silicone Antifoam Agent S 911 Silicone Antifoam Compound S 204. See Silicone Silicone Antifoam Emulsion SE 6 Silicone Antifoam Emulsion SE 9. See Simethicone Silicone Antifoam Emulsion SE 20 Silicone Antifoam Emulsion SE 21 Silicone Antifoam Emulsion SE 22 Silicone Antifoam Emulsion SE 23 Silicone Antifoam Emulsion SE 24 Silicone Antifoam Emulsion SE 25 Silicone Antifoam Emulsion SE 26 Silicone Antifoam Emulsion SE 27 Silicone Antifoam Emulsion SRE. See Silicone emulsion Silicone Antifoam Powd. ASP 15. See Silicone Silicone elastomer CAS 63394-02-5... 

Production of Silicone Surfactants and Antifoam Compounds in Detergents... 

Silanols are reactive silicone compounds which when reacted with silica gives very effective antifoam compounds. Silanol compounds have also been used in softergent applications, in many cases giving better, more durable softening than silicone fluids. 

The performance of silicone-based antifoam compounds is independent of water hardness. They are effective at very low addition levels in all types of surfactant systems normally present in detergent formulations and across a wide range of use conditions. Furthermore, silicones cause no yellowing on fabric. Thus, silicone-based antifoam compounds have a number of benefits over soap-based foam control systems. 

Hundred percent-active silicone-based antifoam compounds are normally referred to as silicone antifoam compounds. If the silicone antifoam is in water, it is referred to as antifoam emulsions. Mixtures of silicone antifoam compounds with nonaqueous dispersion or delivery systems also exist, to aid their dispersion in aqueous media. 

The unique properties of silicone-based antifoam compounds have led to their wide use by the detergent industry. They are active at low use levels in aU types of surfactant systems present in detergent formulations. Many custom-formulated antifoam compounds have been developed for use... 

Silicone antifoam compounds are made by hydrophobizing silica in silicone fluid. The process is conducted at a temperature of 200°C in the presence of a base catalyst, typically KOH. The powdered silica is dispersed into silicone fluid and mixed well. The KOH is added and dispersion is heated. Once the reaction temperature is reached, water gets distilled. Over a period of 4-8 h, the dispersion goes from opaque to translucent. 

In addition to antifoam compounds, various modified formulator-friendly antifoams are available. These include encapsulated antifoam compounds. A method of encapsulating antifoam is by placing it into powders that can be made granular. Silicone compound is a translucent liquid, which can be hard to place into powder detergents. Placing the compound on a material that can be ground to a specified particle size makes formulation easier. 

The unique properties of silicones make them ideal for formulating high-performance, versatile antifoam compounds. New modifications of silicone surfactants will continue to be developed. They will be optimized for particular functionality in detergent formulations. 

Solid-Phase Components. Dispersed sohds are vital ingredients in commercial antifoam formulations. Much of the cmrent theory on antifoaming mechanism ascribes the active defoaming action to this dispersed solid phase with the liquid phase primarily a carrier fluid, active only in the sense that it must be surface-active in order to carry the solid particles into the foam films and cause destabilization. For example, PDMS, despite its considerable effectiveness in nonaqueous systems, shows little foam-inhibiting activity in aqueous surfactant solutions. It is only when compounded with hydrophobic silica [7631-86-9] to give the so-called silicone antifoam compounds that highly effective aqueous defoamers result. The three main solid-phase component classes are hydrocarbons, silicones, and fluorocarbons. 

CNC Antifoam SS [CNCInri.j Chem. Descrip. Compounded silicone fluid... 

Uses Defoamer for solv. phase systems by itself or as base to make emulsion defoamers for water-phase systems CNC Antifoam SSD [CNC Inri.j Chem. Descrip. Compounded silicone fluid with dispersant Uses Defoamer for aq. and nonaq. systems CNC Defoamer 9 [CNC Int l ]... 

Regulatory FDA 21CFR 175.105,176.200,176.210 Properties Gray opaque med.-visc. compd. solv.-disp. vise. 4000 cps 100% act. Use Level 10 ppm Storage 1 yr. storage stability Silicone Antifoam Compound S 204 [Wacker Silicones]... 

Silicon. Gaskets sealant compound, antifreeze, oil antifoam, sand and dirt... 

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