There are several groups of hydrophobic substances used as defomers and commercially categorized into the following general products: - Oil based (Mineral oils vegetable oils, esters, waxes, fatty alcohols) - Powder – defoaming particles ( hydrophobic silica, stearate derivatives) - Water based (emulsion of foam destroying substances in water)
The defoamer formulation as claimed in claim 8, wherein the hydrophobic precipitated silica is obtained by a process that includes precipitating a precipitation silica and isolating a silica filter cake, then forming a suspension of the silica filter cake in water and adjusting the pH to 9 with at least one basic agent to form an alkalified ...
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An emulsion type defoaming agent composition formed by emulsifying 5 to 35 weight parts of an organic fluid, 0.5 to 5 weight parts of a silicone oil, 0.5 to 5 weight parts of a hydrophobic silica and 1 to 40 weight parts of a modified silicone oil into water in the presence of an emulsifier is useful as a defoaming agent for aqueous systems, particularly for strongly alkaline aqueous systems.
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Geared with clear cut understanding of business ethics related to the chemical industry, we are engaged in manufacturing and supplying Sipernat Hydrophobic Silica Series. These are formulated under the strict supervision of our expert professionals using the superior grade compounds, which we source from the most reliable vendors.
Defoamer and Antifoaming Agents in Food and other Industries. Defoamer is an antifoaming agent that inhibits the formation of foam on the surface of liquids by reducing the surface tension. In the additive industry it is typically known as defoamer or defoaming agent. It is mostly used in the industrial processes to give speed to the process.
These might be delivered as an oil or a water based emulsion. The silicone compound consists of an hydrophobic silica dispersed in a silicone oil. Emulsifiers are added to ensure that the silicone spreads fast and well in the foaming medium. The silicone compound might also contain silicone glycols and other modified silicone fluids.
UHC-Tex, a silicon dioxide (SiO2) based super hydrophobic coating spray, is one of the best nano coating spray on the market.This innovative water repellent ultra hydrophobic nano coating spray solution is great for protecting almost any type of textile from water, dirt, contamination and stains – whilst remaining totally invisible!
Defoamers and Air Release Additives. Foam is a dispersion of a gas in a liquid. The occurrence of foam when producing and processing coatings, printing inks, plastic materials, but also in many other industrial processes, is usually not desired.
The principle of foaming and defoaming agents. Jan 26, 2018. Whenever we agitate the liquid or pass the gas, a lot of bubbles are generated inside the surface area of the liquid, and some bubbles generated by the liquid quickly crumble and disappear.
They can be used with all types of foaming liquids, contributing to higher quality end products, improved process efficiency, and a better environment. Shin-Etsu Silicone offers an extensive product lineup to meet diverse needs in a variety of industrial fields. Defoaming Agents Outstanding defoaming effect even when used in small amounts.
Shin-Etsu Silicone is totally committed to meeting the needs of our customers. You have the choice of around 5,000 different kinds of high-performance silicone products to meet your needs, as they are suited to be used in various fields such as electrical, electronics, automotive, machines, chemical, textile, food, and construction.
Fumed Hydrophobic Silica. We have recently expanded our treated fumed silica line to include a larger variety of particle sizes and hydrophobic treatments. All of our treated fumed silica products contain ≥ 99.8% by wt. of SiO2. All products listed below are approved for use under: 21 CFR 176.210, 176.200 and 175.105.
Especially when thickening is required, our hydrophilic and hydrophobic AEROSIL® fumed silica types have proven to be suitable and highly effective for both applications. But besides the thickening effect, AEROSIL® can also be used as an additive to improve multiple performance areas.
They are used when the foam problem is not too great and when the defoaming effect is an additional requirement for providing typical silicone properties to the coating system such as high surface slip and preventing Bénard cells. If their defoaming effect is inadequate, they are combined with silicone defoamers or silicone-free polymer defoamers.
An emulsion type defoaming agent composition formed by emulsifying 5 to 35 weight parts of an organic fluid, 0.5 to 5 weight parts of a silicone oil, 0.5 to 5 weight parts of a hydrophobic silica and 1 to 40 weight parts of a modified silicone oil into water in the presence of an emulsifier is useful as a defoaming agent for aqueous systems ...
The Hydrophilic--Hydrophobic Transition on Silica J. LASKOWSKI~ AND J. A. KITCHENER Department of Mining and Mineral Technology, Imperial College, London, S.W.7., England Received August 20, 1968 An investigation has been made of the contact angle 0 and the zeta potential at the interface between aqueous solutions and vitreous silica which had been methylated by reaction with ...
Alibaba.com offers 1,577 hydrophobic silica products. About 37% of these are oxide, 15% are surfactants, and 12% are coating auxiliary agents. A wide variety of hydrophobic silica options are available to you, such as coating auxiliary agents, plastic auxiliary agents, and petroleum additives.
Hydrophilic precipitated silicas and processes for preparing them are known. Normally the silica is precipitated by simultaneous addition of an alkali metal silicate or alkaline earth metal silicate and an acidifying agent to an initial charge of water or silicate solution.
The role of hydrophobic particles in mineral oil-based defoamers was investigated by fluorescence labeling and microscopy. Defoamer emulsion droplets in water adhere to the air/water interface to become lenses that nucleate bubble coalescence.
the formation of inactive silica and silica-free droplets. In addition, the thin silicone film formed by spreading on the sur-face of the foam lamella may be destroyed or, in a high-surfactant liquor, the antifoam agent may become emulsified. 2. 5 Important Parameters for Efficient Defoaming
It is immiscible with water and most organic medium matter, so that it can eliminate most bubble mediums. Due to heat stability, it can be used in a wide temperature range of -5 ℃ ~ -150 ℃; due to chemical stability, it can be used in acid, alkali and salt solution with no damage to product quality if the formula is appropriate.
Silica gel's high specific surface area (around 800 m 2 /g) allows it to adsorb water readily, making it useful as a desiccant (drying agent). Silica gel is often described as "absorbing" moisture, which may be appropriate when the gel's microscopic structure is ignored, as in silica gel packs or other products.
Our hydrophobic (treated) fumed silica powders provide exceptional performance benefits for a wide variety of applications and industries. Our CAB-O-SIL ® hydrophobic fumed silica products are used around the world to meet our customers' challenging performance requirements. Due to the combination of particle characteristics and surface ...
Find here online price details of companies selling Hydrophobic Silica Gel. Get info of suppliers, manufacturers, exporters, traders of Hydrophobic Silica Gel for buying in India. IndiaMART would like to help you find the best suppliers for your requirement.
Product Name: Fumed Silica XYSIL R120 and R170 Synonyms: Silicon Dioxide, Synthetic Amorphous Silica, Pyrogenic Silica, Hydrophobic Fumed Silica Use of the Substance/Preparation: Used for Rheological control, reinforcement, and free flow agent in Silicone Rubber, Adhesives, Sealant,Coatings, Paint, Ink, Pigment and other applications
Defoamers are frequently used to control the undesired foam. These are often based on oils like silicone oil, mineral oil or vegetable oil, which form the main component. Oil alone, however, is usually not efficient enough. Only with the addition of finely dispersed hydrophobic silica does the defoamer have a prompt and long-lasting effect.
Hydrophobic silica can be used to treat other surfaces to become hydrophobic, this is due to the morphology of the silica particles once they adhere to their host. The silica particles then alter the surface of its host material resulting in a hydrophobic surface. Aggregated fumed silica can be applied to large surfaces to render them ...
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