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A new water-repellent coating material has been developed. The coating is composed of lowmolecular-weight polytetrafluoroethylene particles and anatasetype nanosized TiO^sub 2^. fluoro-oil and a polyvinylidene fluoride binder. This material has been applied to the communication antenna in the snowy area in Japan because of its water-repellent and snow-sticking-free properties. The durability of this coating was improved by adding photocatalytic nano-sized TiO^sub 2^ particles. The inclusion of TiO^sub 2^ particles into the water-repellent coating inhibits surface contamination, which deteriorates the water-repellent property by the photocatalytic reaction of TiO^sub 2^.
One of the main deteriorating factors of mobile phones is water sticking to the surface of the Electret Condenser Microphone (ECM), a vital part of the phone. When this problem is solved, the durability of mobile phones will be greatly improved. This current study applied the water-repellent coating to the ECM of a mobile phone.
Material Preparation
The coating is composed of lowmolecular-weight polytetrafluoroethylene (PTFE) particles and anatase-type TiO, nano particles, fluoro-oil(perfluorinated polyether) and binder (polyvinyliden fluoride), as shown in Figure 1.
The presence of the PTFE particles in the coating material makes it possible...