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▼ Five FAQ of fireproof coating
Source: | Author:presafer | Published time: 2016-07-11 | 2895 Views | Share:
Why using dipentaerythritol instead of pentaerythritol as char-forming agent in water-based fireproof coating?
Dipentaerythritol has better water solubility than pentaerythritol, will not have issues of crystallization or precipitation from coating.

Why water-based fireproof coating can’t add calcium carbonate?
Fillings like heavy calcium powder, calcium carbonate will seriously effect foaming ratio and fireproof property;
They will have chemical reaction with weak acids of formulation, resulted in many CO bubbles that’s not easy to break, then lead to paint film effects like pinholes ect.

Why water-based fireproof coating can’t add magnesium hydrate or zinc powder?
Magnesium hydrate is a kind of alkali,will have reaction with ammonium polyphosphate. Make fireproof coating losing fireproof property;
Zinc power have the same reaction.

Why water-based fireproof coating can’t use sodium salt?
Alkali salt will have reaction with certain ingredients of formulation, lead to more bubbles, high viscosity, paint pinholes ect, make fireproof coating lose fireproof property.

Why fireproof coating can’t use low degree APP?
Low polymerization APP have high water solubility, poor water resistancy and fast hydrolysis;
Low degree APP will hydrolyze to polyphosphoric acid. metaphosphoric acid and release ammonia, at the same time, viscosity deduction, may forming solid bottom, lose fireproof property;
Low degree APP will easily precipitate from coating, make paint whitening,bubbling or even dropping off;
Coating made with low drgree APP have poor weather resistancy, will have film efflorescence,film breaking,dropping off ect after hydrolysis.

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