![]() ![]() Food preservatives such as sorbates and benzoates may be used in specific versions of silicone emulsions, resulting in an acidic pH. ![]() Preservatives such as isothiazolinones (BIT, MIT and/or CMIT), formaldehyde releasers and other additives like bronopol are commonly used in silicone emulsions. Well-manufactured silicone emulsions are stable products that can be stored for extended periods without separation or instability.Ĭertain silicone emulsions are capable of withstanding freeze-thaw cycles, making them suitable for use in very cold climates. This characteristic allows for easy formulation in products like adhesives, varnishes, paints, or coatings without altering their desired properties. In general, silicone emulsions are formulated with a dry extract ranging between 20% and 60%.ĭue to their low viscosity, silicone emulsions can be filtered through fine meshes, typically 250 microns or 100 microns. The dry extract of a silicone emulsion is related to the quantity of the silicone content, which is the active component of this type of product. ![]() A low viscosity is indicative of a well-emulsified product with small particle sizes.ĭry extract, also known as solids, refers to the percentage of non-evaporative material in the emulsion after the drying process. Silicone emulsions made with silicone fluids have low or very low viscosities, typically below 1000cps, making them highly fluid products. Viscosity measures the fluidity of a silicone emulsion. To avoid the need for adjustments in the final product, silicone emulsions are typically adjusted to a neutral pH. Variations in pH do not destabilize the emulsion, but they can impact the final formulation where the emulsion is incorporated. The pH of silicone emulsions is generally not a critical parameter, since non-ionic emulsifiers are commonly used. The most important parameters in a silicone emulsion are: Silicone emulsions allow for easy use of a silicone, allowing for better processing and better efficacy of the final product. Technical characteristics of silicone emulsions After providing this general framework, we will focus on the characteristics of Concentrol’s silicone emulsions, as well as their sectors and applications. ![]() In this document, we will explore the technical characteristics of silicone emulsions, as well as the different families that exist. They only decompose at high temperatures and in the presence of strong mineral acids, bases, and strong oxidizing agents. Silicone oils are inert substances, stable in the presence of water, air, oxygen, and metals. In most cases, these organic groups are methyl (CH 3 ) groups that give silicone oil its semi-organic characteristics. In addition to these bonds, silicone itself has two additional bonds to organic groups. Silicone emulsions are chemical formulations composed of silicone, usually in the form of silicone oil, water, and the necessary emulsifying systems to achieve a stable emulsion.įrom a chemical perspective, silicone consists of a finite chain of silicon and oxygen atoms bonded together. Under these conditions, we would refer to it as an unstable and heterogeneous mixture. With vigorous stirring, they can be mixed, but once the stirring stops, they separate quickly, resulting in the recovery of the two initial phases. When these two incompatible liquids are mixed, they form two phases. Generally, one of them is water, and the other is a water-insoluble liquid, such as mineral or vegetable oil or silicone. An emulsion is a stable and homogeneous mixture of two insoluble or very slightly compatible liquids. ![]()
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