Opportunities abound in almost any traditional

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Opportunities abound in almost any traditional segment (application) of the broad coatings market. For example, anti-fog technology has a very large market poten- tial, with industrial applications potentially including cars and cameras. However, the high cost of the existing anti-fog technologies has hampered their large-scale applications. As a result, most digital cameras with price less than $1,000 do not carry this anti-fog  effect. A simple alternative based on a single layer anti-fog and self-clean- ing coating formed by superhydrophilic SiO 2 –TiO 2 nanostructures developed by Singapore’s scientists can be used to produce high-performing coatings at lower cost (Figure 6.1) [ 21 ]. The coating is prepared by sol–gel dip/spin coating technique on glass substrates. The performance is superior to typical TiO 2 films, which rapidly lose their superhydrophilic properties, within hours of being isolated from a UV source; and is superior to SiO 2 films which are easily contaminated by organic compounds. Another most recent example is a permanent anti-reflective and oleophobic coat- ing for use on cover glasses for touch displays to protect them against fingerprints (Figure 6.2). Table 6.1 Estimated easy-to-clean, anti-fingerprint and anti-bacteria sol–gel nanocoating market size (data of Future Markets, Inc.; reproduced from Ref. [20], with kind permission). Application Revenue (2014), million USD Automotive 60.1 Consumer electronics 23.6 Construction 73.7 Sanitary 172.5 Food (anti-bacteria) 40.1 Medical (anti-bacteria) 134.4 Anti-bacteria (others) 197.8
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154 Biobased and Environmental Benign Coatings Such interactive displays today are ubiquitous and include educational drawing boards, kiosk systems in public places, devices in marine and medical technology, and many other examples. Resisting the burden of being touched many times by users, the multifunctional Daro coating is also anti-reflective, offering increased contrast in bright environments [22]. Another successful line of organosilanes water-based sol–gel products is the Dynasylan series of sol–gel coatings marketed for over a decade by Evonik. These coating formulations are comprised of stable, water-soluble silanol-containing organo- silica sols obtained removing (by distillation) the alcohol released during the hydrolysis of the silanes [23]. A quick look to the areas of their fields of application claimed by the company renders the impressive market potential of these coatings [24]: Adhesives and sealants Building protection Coatings and metal treatment Fillers and pigments Glass fibers and mineral/glass wool insulation Plastics Special applications Figure 6.2 Multifunctional coating for public touch displays (reproduced from Ref. [22], with permission). With SiO 2 -TiO 2 anti-fog coating Without Figure 6.1 Performance of sol–gel anti-mist, anti-fog silica–titania coating developed in Singapore. Manufacturing is ready for scale-up.
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Silica-Based Sol–Gel Coatings 155 Focusing onto building protection only, the company offers a series of hydrophobic
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  • Fall '19
  • Sol-gel, Formulations, Sol–Gel Coatings

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