Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Organoclay helps increase fire protection

Monday, 16 September 2019
pdf
Raw materials & technologies, Applications, Protective & Marine coatings

Organoclay helps increase fire protection

Monday, 16 September 2013

Researchers investigated the fire performance of silicone-based coatings containing expandable graphite and organoclay.

Investigations showed that the clay increased the mechanical properties of the char significantly

Source: Yantra - Fotolia.com

Investigations showed that the clay increased the mechanical properties of the char significantly

Source: Yantra - Fotolia.com

In a new study, the fire performance of a curable-silicone based coatings containing expandable graphite (EG) and an organoclay was evaluated in hydrocarbon fire scenario (standard UL1709) using a lab-scale furnace test. It was shown that the use of organoclay allows achieving better performance.

The influence of the clay as additional filler was investigated regarding the fire performance and the mechanical properties of the char. It was shown that the clay increased the mechanical properties of the char significantly and hence, the fire performance of the silicone based coating. In a next part, the silicone/clay material was characterised by electron microscopy, wide-angle X-ray scattering and solid state Si nuclear magnetic resonance (NMR). It evidenced the nanodispersion of the clay into the silicone matrix and two main interactions: intercalation of some silicate layers and chemical reactionsbetween the hydroxyl groups of the clay and the silicone matrix. Finally, X-ray fluorescence of the residue after fire testing showed the organoclay was present uniformly throughout the thickness of the char, due to the previous interaction, and hence increased the cohesion of the char.

The study by B. Gardella, S. Duquesnea, P. Vandereecken, S. Bellayera, and S. Bourbigot will appear in "Progress in Organic Coatings”, Vol. 76, issue 11, November 2013.

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register