AEROSIL® R is a fumed silica aftertreated with HMDS based on AEROSIL® Applications and Properties. Physico-chemical Data. IL. L. LLL. LLLLLL. AEROSIL® R is a fumed silica aftertreated with organosilane (HMDS) with high specific surface and marked hydrophobia. — The Cary Company, Since. AEROSIL® R S fumed silica after treated with HMDS based on AEROSIL® It is used in paints and coatings, adhesives and sealants, and silicone.
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Additionally or alternatively the coating may display a sliding angle for water of less than 15 degrees or even from 0.
Kind code of ref document: All other materials were analytical grade unless otherwise stated. Most preferably the solvent comprises methanol, ethanol, propanol, isopropanol or a mixture thereof.
Item #: Aerosil R812 Aerosil R812 Fumed Silica Powder
Without wishing to be bound by theory, the present inventors believe that the presence of microclusters in aerosiil composition provides a rough surface to coatings made from the composition and this roughness is, in part, responsible aerosi, superhydrophobicity.
A process for making the composition of as claimed in any one of the preceding claims, comprising the step of combining, in no particular order, the silica-based particles, at least a first part of the solvent and the silicone to provide a mixture.
When silicone was used as to increase film durability samples 6 to 10 the hydrophobicity is slightly decreased compared with the film without silicone sample 5. A composition capable of yielding a superhydrophobic coating, the composition comprising.
Apart from the silica-based particles and silicone, the composition additionally comprises solvent. Occasionally, however, some solvent may remain in the coating and so to prevent unwanted opacity aeorsil such occasions, it is preferred to employ a solvent which has a refractive index close to that of the silica particles.
The composition as claimed in claim 3, wherein the silica-based particles comprise at least one of the following groups:.
Hydrophobic fumed silica
The composition preferably comprises the silica-based particles in an amount from 0. The results are shown in Table 4.
The composition as claimed in any one of the preceding claims, wherein the silica- based particles have a refractive index n pthe silicone has a refractive index n s and the ratio np n s of n p to n s is within the range 0. This example demonstrates the effect of the type of surface modification of fumed silica particles on film properties. Thus the silicone acts to produce larger microclusters but the microclusters are still of a size below the wavelength of visible light. All other aspects of the present invention will more readily become apparent upon considering the detailed description and examples which follow.
Thus it is preferred that the silicone has a viscosity of less than cSt, more preferably less than cSt, more preferably still less than cSt, even more preferably less than cSt and most preferably less than cSt.
It is used in paints and coatings, adhesives and sealants, and silicone rubber. Thermosetting resin composition for sealing packing of semiconductor, and semiconductor device. These surfaces, for example, may be made of glass, glazed ceramics, metal, stone, plastics, lacquer, wood, or combination thereof. Such silicas are described, for example, in United States Patent No. Film equipped with hydrophilic property, stream droplet property, anti-cloudiness and anti-fouling property, manufacture of the film, method for imparting hydrophilic property, steam droplet property, anti- cloudiness and anti-fouling property to base material by the film, base material to which the film is affixed, coating composition for manufacturing the film, preparation of the coating composition.
Additionally or alternatively the refractive index of the silicone n s is in the range 1. In a third aspect, the present invention is directed to a method for making a superhydrophobic coating with the composition described in the first aspect of this invention, the method comprising the steps of applying the composition to a surface and allowing the composition to dry.
AEROSIL® R S by Evonik Resource Efficiency GmbH, BL Coating Additives – Paint & Coatings
Transparency of film was quantitatively r12 by film transmittance at nm. We’re sorry, but the industry you have selected is not currently available in your chosen language. Highly durable superhydrophobic, oleophobic and anti-icing coatings and methods and compositions for their preparation. The process as claimed in claim 13, wherein the second part of the solvent comprises water. The method for making a superhydrophobic coating on a surface preferably comprises the steps of applying the composition to a surface and allowing the composition to dry.
In an often preferred embodiment, the silica-based particle used is silica, especially pyrogenically produced silica i. Articles with surfaces that are difficult to wet, i. The present invention is directed to a composition suitable to yield a superhydrophobic coating and a method for making the same. In this way good mixing of the components is achieved owing r8812 the miscibility of the silicone and polar organic solvent.
AEROSIL® R S Hydrophobic Fumed Silica
Suitably, however, the composition is prepared by a process comprising the step of combining, in no particular order, the silica-based particles, at least a first part of the solvent and the silicone to provide a mixture. Are you a distributor who is interested in being listed here? Silicone fluids or oils are widely commercially aeroisl from manufacturers such as Dow Corning or Blue Star Silicones.
Therefore in compositions of the present invention the microcluster has a diameter of no greater than nm, preferably less than nm, more preferably less than nm, more preferably still less than nm and most preferably less than nm. Aeroisl, UL assumes no responsibility or aerosll for the accuracy of the information contained on this website and strongly encourages that upon final product or material selection information is validated with the manufacturer.
The resulting combination was vigorously mixed to produce a diluted hydrophobic premix wherein mixing was achieved under conditions of standard temperature and pressure.
The t812 may be packed in any form, but preferably is packaged as a conventional hard surface treatment or cleaning product. In particular it is preferred that where the silica-based particles have aerosiil refractive index n pthe silicone has a refractive index n s and the ratio np n s of n p to n s is within the range 0. Heterogeneously sized particles in a microcluster means having particles with different or varying size diameters in the microcluster. Exemplary hydrophibically modified silicas include those comprising at least one of the following groups:.
The composition comprises solvent,silicone and microcluster of silica-based particles. The composition may comprise emulsifier. Also for the avoidance of doubt and by way of illustration in this specification, a composition with microclusters comprising silica-based particles yields support for a composition t812 microclusters consisting essentially of and consisting of silica-based particles.
In Thin Solid Films pp.
Preferably the hard surface comprises, or is, glass.