CC BY
5
• 7universum.com
UNIVERSUM:
, ТЕХНИЧЕСКИЕ НАУКИ_июль. 2023 г.
DOI - 10.32743/UniTech.2023.112.7.15722
INVESTIGATION OF THE PRODUCTION AND PHYSICO-CHEMICAL PROPERTIES
OF MODERN FLAME RETARDANTS
Bakhrom Mukhitdinov
Researcher,
employee of the Ministry of Emergency Situations of the Republic of Uzbekistan,
Republic of Uzbekistan, Tashkent E-mail: baxtiyor_sh@bk. ru
Fayzulla Nurkulov
D.Sc.,
Tashkent Scientific Research Institute of Chemical Technology,
Uzbekistan, Tashkent
Abdulahat Djalilov
D.Sc., Academician,
Tashkent Scientific Research Institute of Chemical Technology,
Uzbekistan, Tashkent
№ 7 (112)
ИССЛЕДОВАНИЕ ПРОИЗВОДСТВА И ФИЗИКО-ХИМИЧЕСКИХ СВОЙСТВ
СОВРЕМЕННЫХ АНТИПИРЕНОВ
Мухитдинов Бахром
исследователь, сотрудник МЧС Республики Узбекистан, Республики Узбекистан, г. Ташкент
Нуркулов Файзулла
д-р техн. наук,
Ташкентский научно-исследовательский институт химической технологии,
Республика Узбекистан, г. Ташкент
Джалилов Абдулахат
д-р хим. наук, академик АН РУз, Ташкентский научно-исследовательский институт химической технологии,
Республика Узбекистан, г. Ташкент
ABSTRACT
During this study, fire-resistant antipyrene was obtained from boric acid and urea. The infrared spectrum of the resulting antipyrene as well as the main physicochemical indicators were studied. Also, the indicators of effectiveness in increasing the fire-resistant nature of the wood materials of the antipyrene obtained in the test-experiments studied.
АННОТАЦИЯ
В ходе этого исследования из борной кислоты и мочевины был получен огнестойкий антипирен. Были изучены инфракрасный спектр полученного антипирена, а также основные физико -химические показатели. Также изучались показатели эффективности в повышении огнестойкости древесных материалов антипирена, полученные в тест-экспериментах.
Keywords: flame-retardants, infrared spectrum, wood materials, coatings, boric acid and urea.
Ключевые слова: антипирены, инфракрасный спектр, древесные материалы, покрытия, борная кислота и мочевина.
Introduction. In recent years, the volume of production of substances and other additives used to increase the fire resistance of polymers and plastics has been increasing worldwide. In particular, over the past
2021, this type of chemicals and additives produced for 27.18 trillion US dollars, while in 2022 it amounted to 27.42 trillion US dollars [1] (fig. 1).
Библиографическое описание: Mukhitdinov B., Nurkulov F.N., Djalilov A.T. INVESTIGATION OF THE PRODUCTION AND PHYSICO-CHEMICAL PROPERTIES OF MODERN FLAME RETARDANTS // Universum: технические науки : электрон. научн. журн. 2023. 7(112). URL: https://7universum. com/ru/tech/archive/item/15722
№ 7 (112)
A UNI
/Ш. ТЕ)
UNIVERSUM:
ТЕХНИЧЕСКИЕ НАУКИ
июль, 2023 г.
23,46 23,35 22,36
27,18 27,42
Figure 1. Production of flame retardants in the world (trillion USD doll)
Today, the production of a new generation of flame retardants based on modern technologies and using highly effective flame retardants is one of the urgent tasks [2-3].
Methods and materials. Fire-fighting properties are demonstrated by impregnating the proposed flame-retardants containing boric acid and urea on the surface of combustible materials or by modifying them with pol-
О
H2N — С — NH2 + H3BO3
о
H9N — С — NHo + H.BO
1:1
ymer materials to form gel-like coatings. Flame-retard-ants synthesized based on the interaction of phosphorus containing, nitrogen containing and boron-containing compounds, and the properties of these flame-retardants studied [4]. When flame-retardants obtained, the reaction processes carried out in two parts.
In the first stage, a reaction of boric acid and urea in 1:1 mass ratios carried out. As a result, an intermediate product obtained at a yield of 65-68%.
О
H9N — С — N = BOH + HoO
2:2
О
HN-С-NH
3DKJ3
HO - В
\ /
в— OH
In this reaction, boric acid condensed with urea, resulting in dimers. The resulting boron stored flame-re-tardants have high-efficiency properties, and good results can be obtain when applied to wooden materials by soaking them dissolved in water.
Flame retardant obtained as result of their composition from condensed urea and phosphate acid compounds characterized by the absence of high toxicity specificity, low cost and positive quality of use.
HN-С -NH
О
Results and discussion. In this experiment, the physicochemical indicators of the obtained antipenes studied. The results indicate that the difference in the indicators of the substance obtained when the mass ratios of the starting substances entering the reaction are changed is not observe (table 1).
№ 7 (112)
A UNI
/Ш. TE)
UNIVERSUM:
ТЕХНИЧЕСКИЕ НАУКИ
июль, 2023 г.
Table 1
The main physico-chemical indicators of antipren from boric acid and urea
Starting substances Ratio, (mass) productivity, % Aggregate state pH Density, g /cm3
1:1 70
1:2 63
1:3 52
Urea and boric acid 2:1 66 White solid 6,5-7,5 1,5-1,8
2:3 61
3:1 56
3:2 67
analysis of the infrared spectrum of flame retardants was carried out, which is used to increase the effective
fire-resistant properties of wood materials made of boric acid and urea (fig. 1).
Figure 2. Infrared spectrum indicators of the antipren obtained in boric acid and urea
At the same time, a 20% water solution of refractory antipren obtained during practical experiments was prepared and soaked in wooden material for 1-1.5 hours in a special bath, at a temperature of 40-50oS. As a result, the fire resistance of wood materials treated with flame-retardant antipyrine was studied the basis of GOST 16363-98 [5].
During the test-experiment, wood samples placed vertically in a black steel tube with a length of 166 mm and a diameter of 50 mm. The flame of the alcohol burner given under the sample, which was released 5 mm
from the pipe. The distance from the upper edge of the burn to the sample was placed at 10 mm. The sample flame held 1 minit 30 c, and the sample's independent combustion and duration of combustion were studied after the sample was taken from the flame.
In the process of the research method, the mass loss of wood treated with coatings under favorable conditions for heat accumulation and during fire time analyzed. During the studies, fire-resistant antipyrene treated and untreated wood materials were tested and tested, and the following results obtained (tables 2 and 3).
Table 2.
Indicators of wood materials that aren't treated with antipyrenes
o/n Time, c. Mass., g Mass. loss
Effects of flame source Spontaneous flare End time up to the experiment Experience after g %
1 120 305 122 128,45 41,9 86,54 67,38
2 120 305 122 126,62 40,8 85,82 67,78
3 120 305 122 130,12 43,14 86,98 66,85
Mass loss of samples, %. 67,3
• 7universum.com
UNIVERSUM:
'E - '-1Ь УК^_июль. 2023 г.
Wood samples that not treated with antipyrenes had a mass loss of 67.3% when studied for fire resistance and were found to belong to the flammable group.
Table 3.
Indicators of wood materials that treated with antipyrine
№ i (112)
o/n Time, c. Mass., g Mass. loss
Effects of flame source Spontaneous flare End time up to the experiment Experience after g %
1 120 10 5 145,78 143,89 1,89 1,30
2 120 11 7 148,32 146,36 1,96 1,34
3 120 11 7 146,68 144,75 1,93 1,31
Mass loss of samples, %. 1,31
According to the results of the test experiment, the weight loss of a sample of wood treated with flame-re-tardants was 1.31%, and this indicator indicates that refractory materials belong to the composition of the first group.
Thus, during practical test-experiments, an antipyrene agent obtained from boric acid and urea. A solution was prepared from this antipyrene and applied in order to increase the fire-resistant nature of wood materials. The results of the test scientifically proven that the fire-resistant property of antipyrene is positive.
References:
1. Guo K.-Y.; Wu Q.; Mao M.; Chen H.; Zhang G.-D.; Zhao L.; Gao J.-F.; Song P.; Tang L.-C. Water-based hybrid coatings toward mechanically flexible, super-hydrophobic and flame-retardant polyurethane foam nanocomposites with high-efficiency and reliable fire alarm response. Compos. Part B 2020, 193.
2. Wang Y.; Kou X.; Deng J.; Zhao J.; Shi H. Ammonium polyphosphate/expandable graphite/TiO2 blended silica fume-based geopolymer coating for synergistically flame-retarding plywood. Constr. Build. Mater. 2022, 317.
3. Shen J.; Liang J.; Lin X.; Lin H.; Yu J.; Wang S. The Flame-Retardant Mechanisms and Preparation of Polymer Composites and Their Potential Application in Construction Engineering. Polymers 2022, 14, 82.
4. Xu Y. Introductory Chapter: Flame Retardant and Thermally Insulating Polymers. In Flame Retardant and Thermally Insulating Polymers; IntechOpen: Rijeka, Croatia, 2021; ISBN 978-1-83968-715-0.
5. Punyanich I, Charoen N, Aroon K. Preparation of boric acid supported natural rubber as a reactive flame retardant and its properties. Polymer Degradation and Stability. 2016; 128: 217-227.
