Peculiarities of Destruction Mechanism of Polymeric Intumescent Fire Protective Coatings

Mačiulaitis, Romualdas; Grigonis, Mindaugas; Malaiškienė, Jurgita; Lipinskas, Donatas

doi:10.3846/jcem.2018.447

Cited by 1 publication

(3 citation statements)

References 17 publications

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“…Despite their versatility, manufacturability in the application, aesthetic characteristics, intumescent-type coatings have a series of disadvantages. First of all, it is low atmosphere resistance [3] and resistance to aggressive environments [4], and, accordingly, a limited service life [5]. The authors of work [6], for example, found that after 30 years of natural aging under the climatic conditions of Italy, intumescent coatings lose their fire protection functions completely.…”

Section: Introductionmentioning

confidence: 99%

“…This is primarily due to the lack of procedures for modeling the conditions of artificial aging for a coating. There are also no adequate criteria for determining the fire-protective properties of the coating after aging, followed by forecasting its service life [4,5]. National and international standards, for example [20], to some extent define methodological approaches to determining the durability of reactive coatings.…”

Section: Introductionmentioning

confidence: 99%

“…For a preliminary assessment of the resistance of a coating against the influence of external factors, it would suffice to determine the degree of maintaining the fire-protective efficiency under the conditions of high humidity. According to many researchers [3,5,21], it is the washing out of soluble components from IC by water that is the most common cause of the loss of fire-protective effect of reactive coatings. However, information about studies into the effects of water on the destruction of intumescent-type coatings is limited and not systematic.…”

Section: Introductionmentioning

confidence: 99%

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Comparing the effect of nanoclays on the water-resistance of intumescent fire-retardant coatings

Vakhitova

Кalafat

Plavan

et al. 2021

EEJET

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This paper reports a study into the effect of nanoclays on the water-resistance of the intumescent system ammonium polyphosphate/melamine/pentaerythritol/titanium dioxide/polymer (ethylene vinyl acetate (EVA) or styrene acrylate (SA). It has been established that adding nanoclay to a coating based on ethylene vinyl acetate increases the fire resistance limit of a metal plate by 30 %, and to a coating based on styrene acrylate – by 50 %. At the same time, coatings that include the EVA polymer are characterized by greater fire-retardant efficiency and less water resistance than coatings containing the SA polymer. It has been shown that intumescent coatings, regardless of the nature of the polymer, under the conditions of 80 % humidity over 800 days their reduce fire-protective properties by an average of 10 %. The loss of coating fire resistance occurs due to the leaching of pentaerythritol, ammonium polyphosphate, and polymer degradation by hydrolysis. The admixtures of nanoclays with a high degree of exfoliation to the studied system create a barrier effect and maximize the chemical formulation of the intumescent coating. The fireproof properties of coatings with organically-modified montmorillonite admixtures are maintained or reduced to 5 % under the conditions of 80 % humidity over 800 days. It has been determined that the direct effect of water on the coating over a period of more than 2 days leads to a significant decrease in the swelling coefficient of intumescent coatings, regardless of the content of a nanoclay admixture in their composition. At the same time, the half-decay period of coatings without nanoclay, calculated on the basis of solubility constant in water, is 0.5 days. For coatings, which include the admixtures of organically-modified nanoclays, the half-decay period increases to 2 days. The results reported in this paper could be recommended for designing water-proof fire-resistant reactive-type nano-coatings with prolonged service life.

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