Influence of dry mixtures in a coating on the effectiveness of wood protection from the action of a magnesium flame

The conducted studies of the impact of thermal action of a high-temperature magnesium flame on construction materials for timber protection from atmospheric factors revealed a pattern of temperature transfer to timber. It was proved that depending on the thermophysical properties of the material, this can lead to its ignition or slowing down the thermal conductivity process. That is why there arises the need to study the conditions for thermal conductivity and establish the mechanism for inhibition of heat transfer to timber. In this regard, a mathematical model of the process of transferring heat flow on the surface of timber when protected by coatings was developed. According to the experimental data and obtained dependences, it was established that the density of heat flow through a steel plate increases to a value of more than 200 kW/m 2 , which is sufficient for ignition of timber. Instead, the density of heat flow through a vermiculite plate did not exceed 5.2 kW/m 2 , which is not enough for its ignition. It was established that the main regulator of the heat transfer process is the heat-insulating properties of a construction product, its resistance to high temperature, because certain construction products, such as an asbestos-cement product, are destroyed under the influence of magnesium flame. That is why a significant impact on the process of protection of natural combustible material when applying the protective coating is made in the direction of heat insulation of the timber surface. This makes it possible to argue about the relevance of the detected mechanism of the formation of heat-insulating properties when it comes to the protection of storage sites of explosive products and the practical attractiveness of the proposed technological solutions. Thus, the features of inhibiting the process of transferring heat to timber during the action of the magnesium flame include heat insulation of timber surfaces by thermally resistant material.Thus, the temperature of a magnesium flame was created on the vermiculate surface, and it did not exceed 100 °C on the surface of the timber

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“…Magnesium chips, at combustion of which the temperature of 2,200 °C is released, were used as fuel [16].…”

Section: The Examined Materials and Equipment Used In The Experimentsmentioning

confidence: 99%

“…The study on the simulation of the process of thermal conductivity of the coating during the thermal action was carried out using the basic provisions of mathematical physics [16].…”

Section: Procedures For Determining the Indicators Of Samples' Propmentioning

confidence: 99%

Establishing patterns of heat transfer to timber through a protective structure

Tsapko

Rogovskii

Titova

et al. 2020

EEJET

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“…This study is a continuation of the studies discussed in [1][2][3][4] where mechanism of fire protection of natural organic materials, foamed coke formation, transfer and implementation of high temperature thermal insulation were considered in detail.…”

Section: Discussion Of Results Obtained In the Study Of The Process Omentioning

confidence: 96%

“…This will ensure development of a new type of flame retarding materials for protection of roof structures using reed by transforming it into fire-resistant material. Moreover, fire protection of the building structures substantially impedes the process of inflammation [3,4].…”

Section: Introductionmentioning

confidence: 99%

Establishment of heatexchange process regularities at inflammation of reed samples

Tsapko¹,

Tsapko

Bondarenko

2019

EEJET

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“…According to the results of the tests, combustible building materials, depending on the value of the critical surface density of the heat flow, are divided into three groups (Table 3). When determining the coefficient of smoke formation, the optical conductivity of the formed flue gases is defined [19]. The essence of the method to experimentally determine the coefficient of smoke formation of solids and materials is to define the optical density of smoke, which is formed by flame combustion or smoldering of a sample of solid material of a certain volume [15].…”

Section: Methodology For Determining the Indicators Of The Properties...mentioning

confidence: 99%

Establishing regularities in the reduction of flammable properties of wood protected with two-component intumescent varnish

Tsapko

Lomaha

Vasylyshyn

et al. 2022

EEJET

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This paper reports the analysis of compositions for fire protection of wood that established that there are not enough data to explain and describe the process of fire protection and, accordingly, the fire-hazardous properties of wood, in order to protect people. The development and research of a set of properties of fire-resistant materials leads to the design of new types of such materials. The object of this study was a fire-protective two-component intumescent varnish for wood. The essence of the research is to determine the indicators of fire danger of wood, fire-protected by coatings, and the impact exerted on them by the formed heat-insulating layer of coke, making it possible to justify the effectiveness of the fire-retardant coating under the influence of temperature. The volume of fire-retardant and hydrophobic coating has been optimized, which ensures the lowest value of loss of mass by fire-protected wood during thermal action. Its lowest value was determined when using flame retardant in the volume of 589 g/m2 and a hydrophobic agent in the volume of 54 g/m2. When determining the combustibility of fire-resistant wood, it was established that the temperature of flue gases during tests was no more than 103 °C, the length of damage to the sample did not exceed 143 mm. At the same time, the weight loss did not exceed 19 g, and the independent burning of wood did not exceed 23 s. In addition, the wood withstood the surface effect of a heat flow of 35 kW/m2, while surface combustion did not occur, and the value of the coefficient of smoke formation was 432 m2/kg during the smoldering of the fire-proof sample. Unlike wood protection with fire-retardant swelling paint, the fireproof wood with two-component varnish, does not change color and refers to low combustibility materials; it is hard to ignite, dose not spread the flame by surface, with moderate smoke-forming ability. The practical significance is the fact that a certificate of conformity was issued based on the reported results. Thus, there are grounds to assert the possibility of directed adjustment of wood fire protection processes by using coatings that can form a protective layer on the surface of the material

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Influence of dry mixtures in a coating on the effectiveness of wood protection from the action of a magnesium flame

Cited by 6 publications

References 10 publications

Establishing patterns of heat transfer to timber through a protective structure

Establishing patterns of heat transfer to timber through a protective structure

Establishment of heatexchange process regularities at inflammation of reed samples

Establishing regularities in the reduction of flammable properties of wood protected with two-component intumescent varnish

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Influence of dry mixtures in a coating on the effectiveness of wood protection from the action of a magnesium flame

Cited by 6 publications

References 10 publications

Establishing patterns of heat transfer to timber through a protective structure

Establishing patterns of heat transfer to timber through a protective structure

Establishment of heat­exchange process regularities at inflammation of reed samples

Establishing regularities in the reduction of flammable properties of wood protected with two-component intumescent varnish

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Product

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Establishment of heatexchange process regularities at inflammation of reed samples