METHODS OF CHEMICAL MODIFICATION OF EPOXY OLIGOMERS (review)

Zagora, A.G.; Ткачук, А. І.; Terekhov, Ivan; Mukhametov, R. R.

doi:10.18577/2307-6046-2021-0-7-73-85

Cited by 5 publications

(3 citation statements)

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“…Chemical modification is carried out by adding thinners and solvents of epoxy compositions (these include unsaturated monomer compounds such as styrene, liquid polyester acrylate TGM-3, and aliphatic epoxy resins DEG-1, MEG-1, which are selfpolymerizing substances and, polymerizing under the same conditions, come into interaction with the main composition, forming a solid solution of one polymer in another). The presence of such "active diluents" makes it possible to obtain low-viscosity flowing compositions [ [25], [26]].…”

Section: Modification Of Epoxy Resins To Improve Mechanical and Physi...mentioning

confidence: 99%

An Overview of Epoxy Resins as coating to protect metals from corrosion

Makhmetova¹,

Negim²,

Ainakulova³

et al. 2023

KIMS/CUMR/MShKP

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Any structures of metal, which are used in construction work, must be qualitatively protected from the external environment, more precisely, from the development of corrosion. Under the influence of the environment as a result of corrosive processes, the metal loses its properties. The presence of corrosion reduces the service life of any equipment in production, it worsens the quality of products. To solve the problems of increasing service life and providing chemical protection of metal, which is made of equipment, constructions, and structures, use highly effective anti-corrosion coatings based on epoxy resins. These materials are chemically resistant and provide a barrier that limits the access of corrosive media to the coated surface. Epoxy resins are stable to the action of halogens, acids, and alkalis, and have high adhesion to metals. However, having a complex of positive properties, epoxy resins have significant disadvantages - high combustibility, stiffness, and relatively low physical and mechanical properties, including resistance to impact, due to the limited mobility of inter-nodal sites of the spatial network of polymer macromolecules. Therefore, epoxy is cured with various hardeners and mixed with a variety of fillers (metallic, mineral, and organic), and many other components to reduce the cost of materials and to allow the properties of the resins themselves to be improved in the desired direction. This overview article discusses the basic properties of epoxy resins and the effects of various hardeners, and modifiers on the anti-corrosive properties of epoxy coatings, as well as general applications of epoxy resins and the health risks of their use.

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Section: Modification Of Epoxy Resins To Improve Mechanical and Physi...mentioning

confidence: 99%

An Overview of Epoxy Resins as coating to protect metals from corrosion

Makhmetova¹,

Negim²,

Ainakulova³

et al. 2023

KIMS/CUMR/MShKP

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4][5][6][7][8][9] As a binder in the production of composite reinforcement by pultrusion from continuous glass or basalt fiber, hot curing epoxy resins are used, the properties of which largely depend on the chemical structure of the epoxy resin, hardener and reaction accelerator. [10][11][12] In particular, the curing modes, mechanical properties and chemical resistance of the binder strongly depend on the nature of the hardener. [7,[10][11][12] From a practical point of view, an important problem for epoxy binders in composite reinforcement operating in concrete is their alkali resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] In particular, the curing modes, mechanical properties and chemical resistance of the binder strongly depend on the nature of the hardener. [7,[10][11][12] From a practical point of view, an important problem for epoxy binders in composite reinforcement operating in concrete is their alkali resistance. [2] This is especially true of reinforcement operating in water-saturated concrete of buried and hydraulic structures.…”

Section: Introductionmentioning

confidence: 99%

Alkali resistant epoxy binders for pultrusion

Leshtaev,

Storozhuk,

Orlov

et al. 2023

E3S Web of Conf.

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Alkali-resistant hot-curing epoxy binders based on ED-20 and new amine hardeners “Amikrost” have been developed, intended for the production of glass-composite fittings for construction purposes. The rheological properties of epoxy compositions were determined, using differential scanning calorimetry and thermogravimetric analysis, the temperature dynamics of the curing process of epoxy compositions and the thermal-oxidative resistance of cured samples were studied. The alkali resistance of cured epoxy compositions and specimens of composite reinforcement in 40% alkali aqueous solution was evaluated. It is shown that the developed amine hardeners provide high alkali resistance of composite reinforcement in comparison with the currently used anhydride hardener iso-MTHPA, which is especially important for reinforcing buried and hydraulic concrete.

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On the physical-mechanical and tribotechnical properties of antifriction carbon fiber based on a modified thermosetting matrix

Dvoryantsev,

Lishevich,

Sargsyan

et al. 2024

Vopr. materialoved.

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The physical-mechanical and tribological properties of anti-friction carbon fiber plastic UGET based on low-modulus carbon fabric “Ural T-15R” have been studied in order to increase the magnitude of the ultimate deformation and reduce the elastic modulus through the use of a modified thermosetting matrix ET-4 instead of the traditionally used ET-2.Modes of polymerization and of heat treatment of epoxy binders were selected considering the results of the experiments. Prototypes of prepregs were obtained by solution impregnation on the UPST-1000M line and then processed into PCM by hot pressing. Laboratory samples were made and physical and mechanical tests were carried out to determine the ultimate strength under compression, shear and bending stress under destruction, as well as Charpy impact strength. Steel 20Kh13 and oxidized titanium alloy PT-3V were used as counter body rollers to determine carbon fiber tribosets.It was shown that carbon fiber samples based on chemically modified binder ET-4 with two-stage polymerization and heat treatment mode in the range of 90°C to 180°C both have better physical-mechanical and tribotechnical properties, in contrast with the analogue with a three-stage mode and carbon fiber carbon heat at friction over 20Kh13 steel and oxidized titanium alloy PT-3V.

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METHODS OF CHEMICAL MODIFICATION OF EPOXY OLIGOMERS (review)

Cited by 5 publications

References 0 publications

An Overview of Epoxy Resins as coating to protect metals from corrosion

An Overview of Epoxy Resins as coating to protect metals from corrosion

Alkali resistant epoxy binders for pultrusion

On the physical-mechanical and tribotechnical properties of antifriction carbon fiber based on a modified thermosetting matrix

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