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PAPERS IN ENGLISH
CHEMICAL ENGINEERING
DOI - 10.32743/UniTech.2023.106.1.14917
STUDY OF TEMPERATURE DEPENDENCE OF THE DEFORMATION PROPERTIES OF THERMOREACTIVE POLYURETHANE USING THERMOMECHANICAL METHOD
Asliddin Shodiyev
Doctoral student of the Department of Chemical Technology Navoi State University of Mining and Technology, Republic of Uzbekistan, Navoi E-mail: asliddin. shodiyev. 93@bk. ru
Bakhodir Mukhiddinov
Professor of the Department of Chemical Technology, Doctor of Chemical Sciences, Navoi State University of Mining and Technology, Republic of Uzbekistan, Navoi
Sharifjon Kiyomov
Senior researcher 111116, LLC Tashkent Scientific Research Institute of Chemical Technology,
Republic of Uzbekistan, Tashkent
Durdona Ibodullayeva
Master of the Department of Chemical Technology Navoi State University of Mining and Technology, Republic of Uzbekistan, Navoi
ИССЛЕДОВАНИЕ ТЕМПЕРАТУРНОЙ ЗАВИСИМОСТИ ДЕФОРМАЦИОННЫХ СВОЙСТВ ТЕРМОРЕАКТИВНОГО ПОЛИУРЕТАНА ТЕРМОМЕХАНИЧЕСКИМ МЕТОДОМ
Шодиев Аслиддин Фахриддин угли
докторант кафедры "Химическая технология " Навоийского государственного горно-технологического университета,
Республика Узбекистан, г. Навои
Мухиддинов Баходир Фахриддинович
д-р хим. наук,
проф. кафедры "Химическая технология ", Навоийского государственного горно-технологического университета,
Республика Узбекистан, г. Навои
Киёмов Шарифжон Нозимович
ст. научн.сотр.,
ООО «Ташкентского научно-исследовательского института химической технологии»,
Республика Узбекистан, г. Ташкент
Дурдона Ибодуллаева Ихтиёр кизи
магистр
кафедры химической технологии Навоийский государственный горно-технологический университет,
Республика Узбекистан, г. Навои
Библиографическое описание: STUDY OF TEMPERATURE DEPENDENCE OF THE DEFORMATION PROPERTIES OF THERMOREACTIVE POLYURETHANE USING THERMOMECHANICAL METHOD // Universum: технические науки: электрон. научн. журн. Shodiyev A.F. [и др.]. 2023. 1(106). URL: https://7universum. com/ru/tech/archive/item/14917
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АННОТАЦИЯ
В этой статье образец полиуретана, был получен поликонденсацией 4,4-метилендифенилдиизоцианата и полиэфирполиола. Температурная зависимость деформационных свойств приготовленного образца полиуретана изучалась термомеханическим методом.
ABSTRACT
In this article, a polyurethane sample was obtained by polycondensation of 4,4-methylene diphenyl diisocyanate and a polyester polyol. The temperature dependence of the deformation properties of the prepared polyurethane sample was studied by the thermomechanical method.
Ключевые слова: поликонденсация, деформация, температура стеклования, температура размягчения, аморфное состояние, температура перехода на высокоэластического состояния, статическое напряжение.
Keywords: polycondensation, deformation, glass transition temperature, softening temperature, amorphous state, transition temperature to a highly elastic state, static stress.
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Introduction. Today, polymeric materials are widely used in all areas of the country's real economy. One of these main areas is the mining and metallurgical industry, which uses various pumps operating in aggressive environments. Polyurethane materials are used to increase the wear resistance of continuously operating pump parts [1]. These coating parts wear out after a certain period of time due to wear and are replaced with new polyurethane coatings. At the Navoi Mining and Metallurgical Combine (NMMC), 80-100 tons of polyurethane material is accumulated as waste annually. The processing of these resulting wastes, as well as the study of the physical and mechanical properties of the processed polyurethane material, are relevant [2]. In the production of parts with high properties, it is desirable to use thermosetting polymers. The main factor in the production of a polymeric material of complex composition is a plasticizer, which forms the basis of the polymer. At present, plasticizers are used to produce polymers and polymer composites with high physicochemical properties. These include, for example,
polyolpolyisocyanates, polycarbonate polymers, epoxyurethane-based polymers, and other thermosetting polymers [3,4]. These 4,4-methylenediphenyl-diisocyanate-containing thermosetting polyurethanes also have a three-component network macromolecular structure, high temperature, chemical attack, deformation resistance and resistance to aggressive environments compared to thermoplastic polymer materials. In addition, it is convenient to obtain various components from liquid thermosetting polyurethanes [5, 6].
Research object. Based on the collected data from the literature review, the stated goal of this study is to study the thermomechanical properties of polyurethane based on 4,4-methylenediphenyl diisocyanate and polyester polyol.
Table 1 lists the production parameters for the ther-moset polyurethane material. Polyurethane with this composition is used for lining internal walls of pumps pumping acid solutions, for a panel of sieves, as well as vibration damping bricks [7].
Table 1.
Synthesis of polyurethane material
Name of source material Weight part, g Temperature of the degassing process, o C Crystallization temperature, o C Crystallization time, hour
4,4-methylenediphenyl diisocyanate one hundred 90 110 24
Adipine acidifying ethylene glycol ether 50 75
1,4 -butenediol 4.8 25
Based on the values given in Table 1, a polyurethane sample was prepared and the thermomechanical properties of this sample were studied [8 , 9].
Methods and materials
Amorphous polymers, in addition to the state of glass transition and fluidity, also have a state of high elasticity, not found in other polymers. The state of high elasticity, fluidity, and the glassy state of the polymers were determined according to GOST 270-75 and GOST 32618.2-2014 on an RMI-60 testing machine [10].
Results and discussion. The transition interval of a polyurethane sample from one state to another under the influence of various temperatures was determined by the thermomechanical method. The studies were carried out with the help of experiments, special devices, tools, as a result of which a graph of the temperature dependence of the deformation was built.
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Where: T s - softening temperature; T g is the glass transition temperature; T ihe - transition to a highly elastic state; T sis is the beginning of strain inversion; T erw - end of reverse warp
Figure 1. Thermomechanical curve of a polyurethane sample
From Fig. 1, the thermomechanical curve shows that at a temperature of 73 °C , the deformation of the urethane-forming aliphatic groups occurs at a low temperature, and the glass transition begins at a temperature of 116°C. An increase in temperature leads to the transition of the polymer sample to a state of increased elasticity, which occurred at a temperature of 135°C. Between T ihe and T sis there is an increase in temperature from 135°C to 160°C, and it is found that with an increase in temperature there is a permanent deformation of the sample. This means that the diisocyanate polyurethane is in a highly
elastic state in the temperature range of 135-160°C. Distance between T ihe and T sis thermomechanical curve is called the upper elastic limit. The next section of the thermomechanical curve is the interval between the points T sis and T erw , in which the curve deviates from the upper elastic limit, i.e., an inversion of the sample deformation is observed. The inversion value of the strain is 25 ^m. The strain inversion of the sample occurred in the temperature range 135-160°C. Based on the above data, the following table 2 was created.
Table 2.
Thermomechanical parameters of the polyurethane sample
Options 4,4-methylenediphenyl diisocyanate polymer
Softening temperature, ° C 73
Temperature of transition to a highly elastic state, ° C 135
Temperature interval of the plateau of highly elastic , ° C 135-160
Deformation inversion start temperature, ° C 160
End temperature of strain inversion, ° C 180
Based on the thermomechanical analysis data, the graph curve showed that the polymer goes into a softened state, starting from 72 °C. The presence of a high elastic plateau on the thermomechanical curve indicates that the new polymer has a densely reticulated supramolecular structure, i.e., the polymer has a thermosetting character.
Conclusion
As a result of the research, it was found that at temperatures below the melting temperature of a thermoset-ting polyurethane sample, polyurethane is solid, its deformation is small, and at higher temperatures, the deformation increases sharply. It has been found that the viscosity of the polymer in the liquefied state decreases with increasing temperature.
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References:
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2. Jalilov A.T., Kiyomov Sh. N. Urethane-epoxy thermosetting polymer systems as an antifriction material // Bulatov readings. - 2020. - V. 5. - S. 76-78.
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7. Kyomov Sh.N. et al. STUDY OF THE THERMOMECHANICAL PROPERTIES OF EPOXYURETHANE POLYMER // Editor-in-Chief: Akhmetov Sairanbek Makhsutovich, Doctor of Engineering. sciences; Deputy Editorin-Chief: Akhmednabiev Rasul Magomedovich, Ph.D. tech. sciences; Members of the editorial board. - 2022. - S. 50.
8. Kyomov Sh.N., Jalilov A.T. ADHESION OF EPOXYURETHANE POLYMER ON METAL // Universum: technical sciences. - 2020. - no. 9-2(78).
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