Hydrophilic Antireflection and Antidust Silica Coatings

Based on the generalization of research results on the processes of obtaining SiO2 sols using tetraethoxysilane and ethyl silicates, the main factors influencing the elasticity of silica coatings on cotton fabrics and their fire-retardant properties are considered. The possibility of forming covalent bonds between the functional groups of cellulose, gel coating and flame retardant layer is considered, which explains the strong fixation of a thin layer of coating on the fibers of the fabric and improve its fire protection. The use of the developed compositions for fire-retardant elastic coatings based on ethyl silicate allows to increase the time of complete burning of cotton from 30s (untreated fabric) to 600s (treated with binary coating).

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UV-Curable Organic-Inorganic Hybrid Films Based on Epoxynorbornene Linseed Oils

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.217-218.294 ◽

2011 ◽

Vol 217-218 ◽

pp. 294-299

Author(s):

Jian Yun He ◽

Jin Ping Xiong ◽

Bing Qian Xia

Keyword(s):

Linseed Oil ◽

Silica Content ◽

Coating Properties ◽

Hybrid Films ◽

Nano Silica ◽

Pencil Hardness ◽

Uv Curable ◽

Inorganic Hybrid ◽

Silica Coatings ◽

Wetting Properties

Epoxynorbornene linseed oil (ENLO) is a new kind of epoxide from renewable sources. An UV-curable organic/inorganic hybrid films using epoxynorbornene linseed oils (ENLO) and surface treated nano-silica were formulated. The mechanical properties，thermal properties and coating properties of the ENLO /silica coatings were evaluated as the function of nano-silica content. The results indicated that after incorporating the nano-silica, the strength, modulus and glass transition temperature of the hybrid films enhanced, while the elongation at break decreased. The nano-silica also improved the hybrid coating properties such as pencil hardness, solvent resistance and surface wetting properties. The morphology observation of the films by atomic force microscopy (AFM) showed that the average silica particle size was ~ 70 nm and the particles were well-dispersed in the organic phase.

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Surface Chemistry of Silica Coatings of Titania

Colloidal Silica ◽

10.1201/9781420028706-56 ◽

2005 ◽

pp. 717-728

Keyword(s):

Surface Chemistry ◽

Silica Coatings

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Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

Applied Sciences ◽

10.3390/app112211044 ◽

2021 ◽

Vol 11 (22) ◽

pp. 11044

Author(s):

Violeta Purcar ◽

Valentin Rădițoiu ◽

Alina Rădițoiu ◽

Florentina Monica Raduly ◽

Georgiana Cornelia Ispas ◽

...

Keyword(s):

Polyvinyl Chloride ◽

Sol Gel ◽

Contact Angles ◽

Hybrid Coatings ◽

Water Contact ◽

Silica Coatings ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Silica Materials ◽

Window Blinds

In this research, we report a simple and inexpensive way to prepare transparent and hydrophobic hybrid coatings through deposition of different silica materials on polyvinyl chloride (PVC) substrates. The silica materials were prepared using an acid-catalyzed sol–gel method at room temperature (25 ± 2 °C), using alkoxysilanes: tetraethoxysilane (TEOS), as the silica source, and ethoxydimethylvinylsilane (DMVES), triethoxyoctylsilane (OTES), and trimethoxyhexadecylsilane (HDTMES), as modifier agents. The obtained materials were characterized (either as powders or as thin films) by Fourier-transform infrared spectroscopy (FTIR), UV/Vis spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), atomic force microscopy (AFM), spectroscopic ellipsometry (SE), and water contact-angle measurements. UV/Vis spectra showed that the PVC substrate coated with the silica material containing TEOS/DMVES/OTES had a transmittance of about 90% in the wavelength range of 650–780 nm. The water contact angles increased from 83° for uncoated PVC substrate to ~94° for PVC substrates coated with the sol–gel silica materials. These PVC films with hybrid silica coatings can be used as the materials for outdoor applications, such as energy-generating solar panel window blinds or PVC clear Windmaster outdoor blinds.

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