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The use of intumescent coatings is classified as passive fire protection. The purpose of this passive fire protection measure is to:
• Insulate the structural member, e.g. steel or other metallic products and wood in the event of a fire.
• Increase the time before the steel loses its structural strength
The intumescent coating acts to:
• Prevent the passage and spread of smoke and fire.
• Allow safe escape for building occupants.
• Prevent and reduce the amount of damage to the structure of the building.
Intumescent Mechanism of Action:
1. The water based binder melts at the right temperature to allow further chemi- cal reaction to take place.
2. The acid source i.e ammonium polyphosphate decomposes to form polyphos- phoric acid.
3. The polyphosphoric acid reacts and catalyses the decomposition of the carbon source i.e. pentaerythitol.
4. The esters formed during step 3 decompose to form a carbon matrix.
5. The blowing agent, typically melamine, decomposes to release inert gases that cause the carbon matrix to foam and expand to provide an insulating barrier.
Intumescent formulation:
Main materials which are suggested by Kimya Exir Arisa are waterbased binders from Xyntra company. Xyntra have developed binder systems which are ideally suited to the formulation of intumescent coatings. Xynpol VO5023AF and Xynpol VO505L are colloid stabilised,APEO free VA/VeoVa copolymer dispersion. Mentioned grades from Xyntra, could be equivalent for Wacker VINNAPAS EZ 3112, with higher quality.
Moreover, wetting agent xynwet 4000 BW, coalescing agent equivalent for texanol xyntrol DBE-B, anti-foam xynburst 9615, dispersing agents xyndisp XA 100 HP and xyndisp 4500 AD are items that could be supplied by Kimya Exir Arisa from xyntra productions.
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