Hydrophobic Coating

swiss-9 easy to clean coating


Introduction
SwiSS-9 surface treatment is a two component liquid solution that once deposited atop suitable surfaces produces a protective and particles and liquids repelling coating. Swiss-9 bonds chemically with glass, ceramic, metal, stone, wood, textile or any other oxide rich surface and creates a durable ultrathin layer. The coated surface becomes transparent Teflon-like with outstanding hydrophobic characteristics. The technology is based on silane chemistry and was researched and developed in close collaboration with Advanced Materials Processing Laboratory, EMPA-Thun. It is proudly manufactured by Swiss-9, GmbH in Switzerland, an “EMPA Spin-off company”.

Working principle
Most traditional construction materials such as brick, rock, wood, glass, metal, etc. possess intrinsically polar surfaces. The intrinsic polarity of these surfaces originates from the nature of the chemical bonds between the atoms comprising these materials. As a result, surface energy of these materials is relatively high and it diminishes the likelihood of environmental deposits not finding residence atop of these surfaces.

Institute
Swiss-9 GmbH

Author
Vasilije Cetkovic

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We have developed a wet-coating solution that post-deposition changes the top layer of the material by attaching a Teflon-like film atop the surface. This film hides surface electrons from contact with the environmental deposits and in doing so increases the likelihood of these deposits preferentially finding a more stable thermodynamic residence away from the Teflon-like film covered surface. The visible spectrum transparent and anti-reflective nature of the film does not change the naked eye appearance of the surface, and in addition it increases the portion of the incident light that transmits through the film as opposed to getting reflected off.

The combination of coating’s Teflon-like surface characteristics that lower intrinsic surface’s attractive potential and transparent appearance results in an upgrade of the construction material that remains esthetically unchanged but with an added function of repelling oncoming unwanted environmental particle deposits such as sand, dust, lime or automotive exhaust products. The coating is efficient in repelling liquids as well, a famous lotus leaf effect, or an ability to convince water and oil molecules to stay together and form pearly structures that roll across the surface as opposed to spreading atop it and contaminating it with enclosed particle deposits post evaporation.

The transparent coating increases by about 5% the portion of the incident light that gets transmitted through the surface in addition to decreasing the frequency of needed cleaning cycles. Any unwanted surface deposit that may find permanent residence atop the coating will be easier to clean and remove due to the crippled adhesion between the coating and its deposits.

Properties of the coated surface

  • Water, oil and particles (dirt, sand, vehicular emissions etc.) repellent 1, 2, 3
  • Anti-reflective
  • Anti-fog
  • Anti-icing
  • Anti-graffiti
  • Anti-microbial (Helps prevent harmful bacteria, algae and mold build-up.)
  • UV Resistance
  • Wear resistance 4
  • Chemical resistance (Resistant to soap and most cleaning agents) 5
  • Mechanical resistance (Not easily wiped off, abrasion test using quartz sand 600 strokes @ 600 strokes per minute, only minor decrease of contact angle after abrasion test)
  • Temperature resistance, from -70C to 400C
  • Curing time (Time to wait after applying Swiss-9 coating is a matter of seconds, until the solvent evaporates)
  • Durability (From 1 year to several years depending on the surface and conditions to which the coated surface is exposed to)
  • Environmentally Friendly
Coating Producer Hydrophobicity Wear resistance 4 Chemical resistance 5
  Static Contact Angle 1 Tilt Angle at Which Water Drop Slides 2 Lime Deposit (mg) 3 Number of Cycles vs. Microfiber Cloth Number of Cycles vs. Cotton Rag Number of Wipes HCI (5%) Vinegar (5%) Hydrogen Peroxide (5%) Glass Cleaner Bleach Duscholux
SwiSS-9 98±2˚ 20±4˚ 0.6±0.1 4000 750 1500
E 94±1˚ 45±4˚ 3.4±0.1 4000 1000 1500
C 87±1˚ 40±9˚ 2.9±0.1 4000 500 1500
N 80±8˚ 40±4˚ 2.5±0.1 1000 0 1000

1 Static Contact Angle quantifies the ability of a surface to repel or attract liquids, if the water contact angle is larger than 90°, the solid surface is considered hydrophobic; Highly hydrophobic and atomistically flat surfaces made of low surface energy (e.g. fluorinated) materials may have water contact angles as high as ~110°).

2 Dynamic Surface Response is the amount of energy input a drop needs to overcome interfacial adhesive attraction and commence movement across its solid surface.

3 The coated surface suffers less soiling so the frequency of cleaning is lower and the deposits could easily be cleaned with a wet or dry towel as the surface is non-stick.



Applications
Swiss-9 protective surface treatment in commercial and residential properties will provide “the brand new look” for years with minimal maintenance. It gives an added value to the investors, contractors, suppliers and architects and designers. Examples of application to be included in project specification is as follows:

Indoor Outdoor
Windows & Mirrors
Bathroom:
Glass shower enclosures
Ceramic tiles & Grout
Glass and porcelain sinks and backsplashes
Kitchen:
Ceramic tiles & Grout
Glass and porcelain sinks and backsplashes
Stoves & Oven doors
Countertops & Cooktops
Glass curtain walls
Skylights and glass awnings
Glass railings, windscreens and fencing

Application methods
1. On site application, new or existing interior and/or exterior surfaces
  a. In a liquid form through spraying and wiping
  b. By using single sachet wipes (one pair covers 1m2)
2. Factory applied, coating may be applied directly to cut-to-size panes of shower, railings, facade glass or other elements
  a. Hand spraying and polishing wheel
  b. Industrial line spraying deposition system

The cost of materials for surface coating is approximately 3.00 CHF/m2. One liter of the first and second component covers approximately 125 m2.

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