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August 12, 2017 18:08

Processing emulsion - find out the nature of the material

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aqueous emulsion - what is it?

Emulsions sometimes called a form of colloidal solutions.Basically they are a combination of at least two fluids are generally not miscible in vivo.Wherein one of the fluids is the dispersed phase and the second forms a continuous liquid medium (continuous phase).Examples of such liquids are many, and they are widely encountered in everyday life, photographic solutions, cooling emulsion metalworking fluids, mayonnaise, milk, and many others.

two liquids can create various types of emulsions, depending on which of them is the dispersed (suspended) phase and which forms a dispersion medium as an emulsion foundation composition.As an example, it is possible to bring such liquid as water and oil processing a product as an oil.When

solution type O / W (oil in the dispersed phase and the dispersion in water), such water is called direct emulsion.If the disperse phase forms a water and oil is the main dispersion composition, consider the inverse emulsion type denoted V / m.

Incidentally, ordinary milk is a direct emulsion (o / w).Are more complex compounds, which are in the form / O / W or O / W / m (i.e., water-oil-water and oil-water-oil).

emulsion treatment - the principle of the formation and use of

compositions of the same emulsions may have a greater or lesser degree of concentration.The majority of them are opaque.With the passage of light (even through water emulsions of oil products), its uniform dispersion determines the white color compositions.If the dispersed liquid phase concentration is reduced, the color becomes bluish, at a high concentration range shifts toward yellow.

Thus, even visually, you can control the quality and composition of the emulsion.For a new generation of solutions created by nanotechnology with special equipment, more characteristic translucency associated with droplet sizes of the particles.

solutions obtained using surfactants, more commonly called microemulsions.Such compositions are not stable, often arbitrarily decompose, restore the original state of the components.An example may cause any hostess, prepare vinaigrette, seasoned with oil and vinegar.A feature of such formulations is their thermal stability, nanoemulsions have kinetic stability.

Application in the construction of aqueous emulsions quite popular.Hydrophobic compounds applied to any surface, ranging from concrete and fiber-cement structures, finishing of natural stone. can also make water-repellent properties of the coating of paint and plaster.Such aqueous emulsions contain vysokoalkilirovannye products such as alkoksisiloksan and fluoropolymer.

with a specific chemical composition of such water emulsion capable of protecting not only the surface from moisture, dirt and even oil stains.Even the ability to bind spotted surface, protecting it from cracking and chipping.The essence of action is simple, because the water evaporates after application, leaving the surface of the solid polymer film.

Echoes application of aqueous emulsions can be found in paints.Thus, the silicone resin in the composition of its water emulsion is used as a binder for reliable coating silicone paint mineral surfaces, the most famous example of which is cement.In the same way it is used in the polymer dispersions, most of which can be used include styrene-acrylate.

There are also examples in the automotive industry: without lubricating and cooling emulsions, no car will not find it on the road.Roads, by the way, is based on bituminous binders are emulsions.If fully dehydrate gasoline, it will not burn in the engine cylinder chamber (proven fact).In the production of pesticides in agriculture are also widely used such solutions.And the list goes on.

resulting aqueous emulsion

Create emulsion with a long period of steady state is difficult.However, the use of special surfactants known as emulsifiers, facilitates the creation of a stable emulsion of liquids, which are difficult to dissolve in each other.Substances emulsifiers promote occurrence of the dispersed phase in the respective liquid.Of course, the type will also depend on the volume fractions of mixed composition.But

as emulsifying compounds are selected those substances which are not readily soluble in the dispersion liquid, contributing to a corresponding phase.In Examples include proteins poorly soluble in oil and dissolving in water is better.They contribute to a better education direct o / w emulsion.

main methods for producing a homogeneous emulsion are in the gradual addition of a mixture of surfactants and dispersed component is constant, dispersion, with the strong stirring of the latter.Passing through the major component of air bubbles, causing it to "boil" was added and dispersed component n-active substances.The second way is also obtained homogeneous emulsion compositions.

Over time, the emulsion stability is reduced.Decomposition and separation into components.The reason may be the force of attraction of dispersed droplets, the surface it appears as a loss of "flakes".Various density leads to the fact that the particulate material is raised to the upper layer of the emulsion, etc.Typically, surfactants impart greater stability, affecting the dispersed droplet size constancy.

When and how to destroy the emulsion composition?The first film destruction emulsifiers promote appropriate chemicals - reagents.With their help, there is adsorption of emulsifiers or their replacement.

heating may help usually leads to their rapid delamination.There are mechanical methods of separation of compounds by varying the density of components (centrifuges).Separation can be achieved using the electrolyte of electric action, etc.

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