MOSCOW (MRC) -- Munich-based chemicals group Wacker has presenting its WACKER HC 303 silicone emulsion at the 2014 World Conference on Fabric and Home Care, organized by the American Oil Chemists’ Society (AOCS), reported the company on its site.
The product forms a water-repellent silicone film on textiles, leather, wood or other substrates. The microemulsion contains no solvents and allows manufacturers to develop highly effective impregnants for a variety of household applications. Water forms beads on impregnated materials - an effect that deteriorates with frequent washing. WACKER HC 303 silicone emulsion makes it possible to impregnate fabrics and to restore the water repellency of already impregnated textiles while laundering.
Until WACKER HC 303 was developed, it was by no means certain that good impregnation results could be achieved with water-based silicone emulsions. On the contrary, water solubility and hydrophobicity were long considered to be mutually exclusive. The reason for this is that the stabilizing emulsifiers form water-permeable microchannels in the impregnation film, which severely compromise the impregnation effect.
The Munich-based chemical group solved this problem by developing the WACKER HC 303 silicone emulsion, thus finally achieving a breakthrough in water-based impregnation systems. Upon drying, the colorless, low-viscosity, oil-in-water microemulsion forms a water-repellent silicone film that remains unaffected by emulsifiers or other inclusions. When used in textiles or leather, the emulsion envelops individual fibers in a thin, uniform layer without sticking them together. This allows the impregnated surface to breathe and stay dry, while water and other aqueous liquids - such as red wine or coffee - immediately bead off. The impregnant achieves its full effect even at room temperature. The impregnated substrate does not need to undergo heat treatment following application.
WACKER HC 303 can be processed to create ready-to-use, aqueous impregnants and polishes for a wide variety of porous substrates such as textiles, leather, cork, wood or stone. The microemulsion is particularly suitable as a laundry impregnant that can be added directly to the rinse cycle. In these applications, WACKER HC 303 restores previously impregnated textiles to their full water-repellent effect.
As MRC wrote previously, Wacker is expanding its product range with a new liquid silicone rubber for the production of automotive gaskets. Molded parts made from the new silicone are resistant to heat and coolant and exhibit low compression set even under permanent stress. Car radiators and cooling-system components can thus be reliably sealed. ELASTOSIL RT 728, as the new silicone grade is called, can be injection molded or mechanically dispensed straight onto the part to be sealed.
Wacker Chemie AG is a worldwide operating company in the chemical business, founded 1914. The company is controlled by the Wacker-family holding more than 50 percent of the shares. The corporation is operating more than 25 production sites in Europe, Asia, and the Americas. The product range includes silicone rubbers, polymer products like ethylene vinyl acetate redispersible polymer powder, chemical materials, polysilicon and wafers for semiconductor industry.