Water Repellency of Acrylic Silicone/Silica Nano-Composites (1)Effects of Solvent and Silane Coupling Agent

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  • アクリルシリコーン／シリカ・ナノ複合材料の撥水性(1)表面撥水性におよぼす調製時の溶媒およびアクリルシリコーン，シランカップリング剤添加の影響
  • アクリルシリコーン シリカ ナノ フクゴウ ザイリョウ ノ ハッスイセイ 1 ヒョウメン ハッスイセイ ニ オヨボス チョウセイジ ノ ヨウバイ オヨビ アクリルシリコーン シランカップリングザイ テンカ ノ エイキョウ

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Abstract

In acrylic-silicone polymer (CAS) solutions, silica micro particles were synthesized by addition of tetraethoxysilane (TEOS) and hydrophobic silane coupling agent (SCA). The morphology of the micro particles and the surface properties of the coating deposited with silica dispersions were examined. Effects of solvent types, concentration of CAS and SCA on these properties were also investigated.The diameter of the particles was depressed by addition of CAS in EtOH/H2O and IPA/H2O solutions (400-500nm→80-100nm), and it was further smaller by using both CAS and SCA (20-100nm). From the results of XPS, the peak ratios of C/Si increased by addition of CAS or CAS-SCA. It was considered that a part of silicone blocks and hydrophobic groups of SCA were localized on particle surface. When CAS-silica colloid was coated on a glass substrate, the contact angle value (CA) increased with CAS concentration and showed maximum value. The CA of the CAS-silica was larger than that of the CAS independently coated, and the CA of the CAS-SCA-silica was >150°. It was thought that in the preparation reactions, the carboxyl groups in CAS were interacted with silica precursor and a part of the CAS were being included into the silica particles. By using both CAS and SCA, bulky hydrophobic groups, e.g. trimethylsilil, were also introduced in the silica surface. The particle diameter depression and the improvement of the CA were attributed to the introduction of silicone blocks and hydrophobic groups on surface of the silica particles. A Super water-repellent surface could be prepared by combining hydrophobic surface and the unevenness of the silica particles.

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