TECHNOLOGICAL ASPECTS OF THERMOSTABLE COATING PRODUCTION

ABSTRACT

This article provides information on the technological scheme of the substance for obtaining thermal and photo-stable coatings. Also, in the technological scheme, the raw materials pass through the capacity, the synthesis process is carried out in the jacketed reactor, and then the product is sent to the reactor. After separating the products that did not react in the reactor, they are sent back to the jacketed reactor. The product formed in the reactor is removed from the bottom and collected in the tank. The parameters of the time, temperature and pressure required to obtain the finished product are given.

АННОТАЦИЯ

В данной статье представлена информация о технологической схеме субстанции для получения термо- и фотостойких покрытий. Также в технологической схеме сырье проходит через емкость, процесс синтеза осуществляется в реакторе с рубашкой, а затем продукт направляется в реактор. После отделения продуктов, не прореагировавших в реакторе, они направляются обратно в реактор с рубашкой. Образовавшийся в реакторе продукт извлекается со дна и собирается в емкости. Приведены параметры времени, температуры и давления, необходимые для получения готового продукта.

Keywords: jacketed reactor, capacity, BIA thermostable coating, maleic acid, urea, craton aldehyde, reactor, raw material.

Ключевые слова: реактор с рубашкой, производительность, термостойкое покрытие BIA, малеиновая кислота, мочевина, кратоновый альдегид, реактор, сырье.

Introduction. Currently, the world market is in high demand for construction and finishing materials used in various conditions. In this field, there is a need to find new, technologically effective, cheap and simple solutions to meet the needs of consumers. Such products combine high performance, quality and ease of use[1-4]. Also, this monolithic has already found its place as seamless coatings, waterproofing, coating and anti-corrosion materials[5].

That is why the development of a polyurea coating system that does not require special equipment and has high UV resistance properties is an urgent topic for research[6-8].

Experimental part: The following procedures were followed to synthesize the oligomer.  In the first step, 23.2 g of maleic acid and 6 g of urea were mixed together. At the reaction temperature of 120°C, the substances became liquid. The yellow mass formed on the basis of maleic acid and urea boiled and polymerized at 150°C to form a yellow mass. The mechanism of the reaction is that the carbon atoms connected by the double bond in maleic acid are connected to the nitrogen atom in urea. A yellow mass of adduct was formed. The resulting adduct was reacted with 16.5 ml of croton aldehyde in the second step. The temperature was kept at 150°C with stirring and croton aldehyde was added dropwise. The reaction is carried out until a thick mass is formed. Croton forms an -OH group with the oxygen atom bonded to the double bond in the aldehyde and the hydrogen bonded to the nitrogen in the adduct, and the carbon atom is bonded to the nitrogen.

The reaction of maleic acid with urea was carried out in the traditional way, and the reaction is generally represented by the following equation:

To improve the properties of the obtained adduct, it is advisable to modify it. Various modifiers have been used to date. Also, two-component systems with properties given by epoxy polymers have been created. Industrial waste croton aldehyde was used as a modifier in the research. The reaction equation of the adduct with croton aldehyde is represented by the following equation.

By influencing the physical state, structure and chemical composition of synthesized (oligo)polymers, crystallization temperature, gel formation time and chemical reagents, the specified thermal and physical parameters of refractory compositions were achieved. Development of fire protection mechanisms of wooden and inorganic building constructions with the help of created compositions; effective fire-resistant coatings based on urethane were created. At the same time, with their help, methods of increasing the fire resistance of wooden and inorganic constructions and multi-stage fire protection were developed.

Based on the proposed technology for obtaining a thermostable oligomer (Fig. 1), a mixture of reagents (maleic acid, urea) required for the composition is measured in the required amount through a dispenser, and the products are mixed in a jacketed reactor through the capacity (1 and 2) 2:1 mol mixed in proportion and sent to carry out the synthesis process. Jacketed reactor (4) for fraction I, the temperature is 120-130 ºC, the pressure is 1-1.2 atm depending on the temperature, and the time duration is 55-60 minutes.

Figure 1. The principle technological scheme of obtaining BIA thermostable coating

1, 2, 3- feed for primary products, 4- jacketed reactor, 5, 7- reactor, 6- heater, 8- finished product capacity, 9- collector, 10, 11, 12, 13- pump.

Products are mixed in a jacketed reactor (4) using a stirrer. Through the jacketed reactor, fraction II (croton aldehyde) is metered dropwise through the doser until it reaches a ratio of 2:1 to carry out the synthesis process through the capacity (3). Jacketed reactor temperature rises from 120-130 ºC to 140-150 ºC, pressure is 1-1.2 atm, time duration is 60-120 minutes depending on complete bond formation (monitoring system viscosity). Products are mixed using a mixer. In order to provide heat, hot water is introduced from the lower part of the reactor and discharged from the upper part. The resulting product is sucked from the lower part of the jacketed reactor (4) with the help of a pump (11), and the products that did not react in the initial I-II fraction are removed from the lower part of the reactor (5) and returned to the original state. The temperature in the reactor is maintained at 150-160 ºC, the pressure is 1-1.2 atm, in which the products that have not entered the reaction are sucked from the bottom of the reactor (5) with the help of a pump (10) and are returned to the process from the side of the jacketed reactor. The finished product is taken out from the side of the reactor, passes through the heater (6) with the help of a pump (12), and is introduced from the middle part of the reactor (7) at 160-170ºC. The temperature in the reactor is 160-170ºC, the pressure is 1-1.2 atm. Unreacted substances are sucked from the upper part of the reactor (7) with the help of a pump and collected in the collector (9). The finished product, cleaned of excess substances in the reactor, is collected in the container (8) through the lower part of the reactor (7). After cooling, the finished product was removed from the container (8). The mass of the obtained product is 43.2 g and the total yield is 90%.  Table 1 below shows the addition ratios of all reagents used for the synthesis process: maleic acid, urea, and cratonic aldehyde.

Table 1

Consumption of raw materials

Conclusion. On the basis of the proposed technology, a continuous thermostable poly(oligo)mer production technology with 90% yield is created and the process control is possible. By using the BIA substance synthesized using this technological process as a thermo- and photo-stable coating, it will be cheaper than analogues imported from abroad, and the efficiency coefficient will be higher.

References:

1. V.N Axmedov., K.E Ro‘zieva., M.S Raxmatov.,  N.Sh.Panoev., H.R Ro‘ziev., S.M Murodjonov. Gidrofob sement olishning ba’zi aspektlari // Fan va texnologiyalar taraqqiyoti. Ilmiy-texnikaviy jurnal, Buxoro, 2018 №1. 69-73b. (02.00.00;№14)
2. Axmedov V.N., Niyozov L.N., Panoev N.Sh., Vaxxmudjonov S.M. Production and application of hudrophobizing polimer compositions // International journal of advanced research in science, Engeneering and Technology, India, Vol. 5, Issue 11, November 2018. page7340-7345.
3. L.N. Niyazov., Panoev N.Sh., V.N.Axmedov., S.M Murodjonov., A.A Xaydarov. Gidrofobizatsiya sementnыx i keramicheskix izdeliy s ispolzovaniem vodorastvorimix kremniyorganicheskix soedineniy // Kompozitsionnыe materialы Uzbekskiy nauchno-texnicheskiy i proizvodstvennыy jurnal, 2019. №1. S106-109 (02.00.00; №4)
4. N.Sh Panoev., V.N.Axmedov. Kremniyorganik birikmlar asosidagi teploizolyatsion qoplamalarning yangi tarkibini yaratish va xossalarini o‘rganish // Fan va texnologiyalar taraqqiyoti. Ilmiy-texnikaviy jurnal, Buxoro, 2019 №3. 64-69 b. (02.00.00; №14)
5. V.N. Axmedov., L.N.Niyazov.,K.E.Ruzieva., F.F Raximov., Panoev N.Sh. Gidrofobizatsiya v stroitelstve. (monografiya).- Izdatelstvo Buxara, Durdona, 2018. c160.
6. V.N Axmedov., M.S Raxmatov., N.Sh.Panoev. Texnologiya polucheniya kompozitsiy na osnove kremniyorganicheskыx gidrofobiziruyuщix polimerov // II international scientific conference of young researchers. Baku, 2018. s 472-474.
7. B. Sobirov., V.N Axmedov., N.Sh.Panoev. Vliyanie parametrы na vыxod kremniyorganicheskыx monomerov // Sbornik trudov mejdunarodnoy nauchno-texnicheskoy konferensii studentov, magistrantov na temu Molodej-zalog budusheva velikoy stepi. Shыmkent, 2019. S 294-296.
8. V.N. Axmedov, N.Sh. Panoev, S.M. Maxmudjonov. Poluchenie gidrofobiziriyuщix kompozitsii polimerov i ix primenenie v stroitelstve // II Vserossiyskaya molodejnaya nauchno-prakticheskaya konferensiya Ekologicheskie problemы promыshlenno razvitыx i resursodobыvayuщix regionov: puti resheniya 2018. 20-21 dekabrya.