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Monday, 23 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Optimised sol dispersions applied in hybrid coatings for fire protection

Thursday, 1 August 2013

In a new study, silica sols were prepared by sol-gel technology. Subsequently, the solvent was removed by vacuum distillation. Optimised sol dispersions were used to form UV-curing organic–inorganic hybrid coatings.

A series of silica sols modified by γ-methacryloxypropyltrimethoxysilane (MPS) were synthesised by the acid-catalysed sol-gel method. Afterwards, the solvents in these sols were extracted under several vacuum distillation conditions. The stability of the sol after the distillation can be improved by means of increasing the dosage of MPS and incorporating reactive diluent TPGDA into the sol as new dispersion medium.

Sol dispersions and UV-curable organic compounds were mixed

Optimised samples have maintained stable for over 180 days. The sol dispersions and UV-curable organic compounds were mixed to form hybrid coatings for fire protection. Effects of the distillation treatment and the cosolvent anhydrous ethanol added into the reaction solution on thermal and combustion performances and physical properties of the hybrid coatings were studied by thermogravimetric analysis, microscale combustion calorimeter, limit oxygen index test, UL-94 horizontal test, etc.

The results showed that the distillation treatment for the sol was necessary to improve thermal performance and physical properties of the hybrid coatings. In addition, in the flammability experiment, hybrid coatings showed a quick and efficient protection of the substrate.

The study appeared in the "Journal of Sol-Gel Science and Technology", July 2013, Vol. 67, issue 1.

The organic-inorganic hybrid coatings have been developed for fire protection

Source: Stephanie Bandmann - Fotolia.com

The organic-inorganic hybrid coatings have been developed for fire protection

Source: Stephanie Bandmann - Fotolia.com

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