Promotion effect of nano-SiO2 on hygroscopicity, leaching resistance and thermal stability of bamboo strips treated by nitrogen-phosphorus-boron fire retardants.

Zhou, Zhongxi; Du, Chungui; HuiLong, Yu; Yao, Xiaoling; Huang, Qiuli

doi:10.37763/wr.1336-4561/65.5.693704

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…The value of the effect of hygroscopicity on washing-out resistance affects the indicators of fire-protective substances [2]. To increase fire protection, nano-SiO 2 zol was added to various nitrogen-phosphorus-boron fire-retardants to produce four new impregnation compounds, specifically: (1) ammonium dihydrophosphate+tetrahydrate dinatrium octaborate (AD), (2) ammonium dihydrophosphate+tetrahydrate dinatrium octaborate+nano-SiO 2 sol (ADS), (3) ammonium dihydro phosphate phosphate+boric acid (AB) and (4) ammonium dihydrogen phosphate+boric acid+ nano-SiO 2 sol (ABS).…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell

Tsapko

Vasylyshyn

Melnyk

et al. 2021

EEJET

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The analysis of fire-protective materials for wooden building structures was carried out and the need to develop reliable methods for studying the process of washing out fire retardants from the surface of the building structure, which is necessary for the creation of new types of fire-protective materials, was established. That is why there arises a need to determine the conditions for the formation of a barrier for washing out and to establish a mechanism for inhibition of moisture transmission to the material. In this regard, a mathematical model was built of washing out fire retardants using a polymeric shell made of organic material as a coating, which makes it possible to estimate the effectiveness of a polymer shell by the amount of the washed-out fire retardant. According to the experimental data and theoretical dependences, the dynamics of the release of fire retardants from the fire-protective layer of the coating was calculated; it did not exceed 1.0 %, and therefore, ensures fire protection of timber. The results of determining the weight loss of the sample under the influence of water indicate the ambiguous impact of the nature of protection on the washout. In particular, this implies the availability of data sufficient for performing a high-quality process of moisture diffusion inhibition and, based on it, detection of the moment, from which a decrease in efficiency of a coating begins. The experimental studies proved that a sample of fire-protected timber after exposure to water for 30 days withstood the influence of a heat flow. In particular, the loss of timber weight after the temperature exposure was less than 6 %, and the temperature of flue gases did not exceed 185 °C. Thus, there is a reason to assert the possibility of directed control of the processes of fire protection of timber through the use of polymer coatings capable of forming a protective layer on the surface of fire-protected material, which inhibits the rate of washing out the fire retardants

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Section: Literature Review and Problem Statementmentioning

confidence: 99%