In addition, fumed silica puts us on a good footing… …and a flawlessly printed morning paper. It helps to make homes weathertight… …and make us healthy. Kloepfer had invested four years of his life in this discovery—but now this time seemed wasted. Fortunately, his supervisors at Degussa reconsidered their decision.
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Samucage Taro leaves, for example, have been used as templates for polystyrene structures that can display a lotus leaf effect. This example demonstrates the effect of composition on the contact angle and sliding angle of films.
Plate with a plate appliance of household appliance and base unit surface layers. In an often preferred embodiment, the silica-based particle used is silica, especially pyrogenically produced silica i. Often solvent will make up the balance of the composition but optional ingredients such as colourants, preservatives and the like may also be present in the composition. Most preferred are volatile solvents i. Treatments and kits for creating transparent renewable surface protective coatings.
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. In fact, the cleaning of surfaces that attempt to mimic the surface of a lotus leaf has been investigated.
It also can be easily be incorporated into silicone rubber formulations and improves their mechanical and optical properties.
This example demonstrates the effect of silicone on the size of microclusters of silica- based particles dispersed in ethanol. The content of such third party sites is not within our control, and we cannot and will not take responsibility for the information or content.
Following formation of the mixture, a second part of the solvent may be added to the mixture, if desired. Suitable compositions and varnishes are described in our co-pending International Patent Application with application no. Exemplary hydrophibically modified silicas include those comprising at least one of the following groups:. Company The Evonik Coating Additives Business Line from Evonik offers its customers with optimal solutions in the paints, coatings and printing ink sectors and supports them with the production of resource-efficient coatings.
The resulting combination was vigorously mixed to produce a diluted hydrophobic premix wherein mixing was achieved under conditions of standard temperature and pressure. Fifty 50 grams of silica, made commercially available by Evonik Degussa GmbH as Aerosil R particle size about 7 nmwere combined with fifty 50 grams of polydimethylsiloxane made commercially available by Bluestar Silicones under the Bluestar BP name and one 1 litre of isopropyl alcohol.
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. Evonik Industries — Specialty Chemicals — Productfinder Apart from the silica-based particles and silicone, the composition additionally comprises solvent. Typically the particles in an unbundled state will have a particle size in the range of 0.
The composition as claimed in any one of the preceding claims, wherein the solvent has a refractive index n a in the range 1. These compositions and the contact angle CA and sliding angle SA of the films remaining after drying the compositions on a surface are shown in Table 1. Typically, the hard surface is in a household including window, kitchen, bathroom, toilet, furniture, floor, or the like.
More preferably the solvent comprises polar organic solvent and water in a weight ratio of solvent: The composition may be packed in any form, but preferably is packaged as a conventional hard surface treatment or cleaning product.
Without wishing to be bound by theory, the present inventors believe that the presence of microclusters in the composition provides a rough surface to coatings made from the composition and this roughness is, in part, responsible for superhydrophobicity.
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. The Evonik Coating Additives Business Line from Evonik offers its customers with optimal solutions in the paints, coatings and printing ink sectors and supports them with the production of resource-efficient coatings.
Advantageously polar organic solvent may be used to improve the compatibility of silicone with water.
The average size z-average of the aggregates in the dispersion containing silicone was nm whilst for the aerosip without silicone the size was nm. Particle size was measured in the dispersions whilst transmittance and contact angle were determined on the dried films. Country of ref document: It is used in paints and coatings, adhesives and sealants, and silicone rubber.
Are you a distributor who is interested in being listed here? This website provides links to other websites owned by third parties. Droughts, poor irrigation and insufficient plumbing systems are just some of the reasons that cause water shortages in certain regions.
In some instances, for example, the coating may display a contact angle for water of at least degrees or even from to degrees. Such an angle maybe measured with a goniometer or other water droplet shape analysis systems. The composition preferably comprises the silica-based particles in an amount from 0. In particular it is preferred that where 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.
Film transparency is a direct index of resulting appearance of film on different substrates. Exemplary hydrophibically modified silicas include those comprising at least one of the following groups: TOP 10 Related.
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