Recycling of glass fibers sheets from thermoset reinforced plastic using thermolysis method

Protsenko, Alexander E.; Pimenova, ED; Петров, В. В.

doi:10.1088/1757-899x/734/1/012185

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…The decomposition of waste office equipment shows high exothermic effects with peaks at 500°C in air and 670°C in nitrogen. These results could be compared with thermal degradation of epoxy-vinyl-ester binder [28]: intensive combustion at 340-445°C and complete mass loss at 523.5°C also accompanied by heat emission.…”

Section: -1-thermal Decomposition Of Compositesmentioning

confidence: 99%

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Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

et al. 2022

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This article aims to develop a method for regenerating and reusing carbon and glass fibers extracted from unrecyclable scraps of carbon plastics, printer parts, and laminating coating. A comparison of known methods of fiber regeneration revealed the advantages of thermal treatment: absence of costs of reagents and complex equipment; better preservation of composition; and strength of fibers. Based on the results of thermographic analysis of wastes in nitrogen and air, the destruction temperatures of their organic matrices were determined (200-460°С), and the use of calcination instead of pyrolysis was justified. The appearance and surface quality of the regenerated fibers are characterized by optical and electron microscopy. It has been established that quantitative extraction of pure carbon and glass fibers from waste crushed to 1 cm is efficient by their calcination at 700 °C for 0.5 h and 500 °C for 1 h, respectively. The principle of creating new composites with the obtained fibers based on the similarity of their composition and binding materials (matrices) has been proposed. It was shown that the introduction of 1 wt% of fibers into slag blocks and active carbon pellets considerably increases their compressive strength, but the bending strength does not change due to dispersed reinforcement. Possible improvement of mechanical properties of products requires reagent treatment of the fiber surface or the introduction of binder additives. Calculations show that the developed method of recycling composite waste can produce 2.3 tons/hour of reinforced building materials that are good for the environment and the economy, excluding expenses for landfill waste disposal and reducing the cost of the product by replacing the primary fiber for the secondary one. Doi: 10.28991/ESJ-2022-06-05-04 Full Text: PDF

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Section: -1-thermal Decomposition Of Compositesmentioning

confidence: 99%

“…Its undoubted advantage is creating an additional number of useful products for various industries and the absence of environmental recontamination. The paper of Protsenko et al (2020) presents data on the processing of fiberglass reinforcing agents [28]. Thermolysis of GRP based on epoxy vinyl ester binder was carried out at 400 °C for 30 minutes.…”

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confidence: 99%

Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

et al. 2022

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“…Таким образом, создать условия, при которых прочность волокон в результате рециклинга снижается только на 8%. При этом применение термических методов рециклинга позволяет получать волокна с прочностью, не превышающей 80% от исходной [14,15].…”

Section: результаты и обсуждениеunclassified

Рециклинг Стеклоармирующих Наполнителей Из Полимерных Композитов На Основе Эпоксивинилэфирного Связующего

Проценко¹,

Петров²

2022

mkm

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Представлены данные экспериментального исследования возможности рециклинга полимерных композитов на примере стеклопластика из полотняной стеклоткани и эпоксивинилэфирного связующего. Цель рециклинга — удаление полимерной матрицы и получение восстановленного стекловолокна, не уступающего по свойствам первичному материалу. Рассмотрен метод сольволиза композита в среде метилдиэтаноламина. Установлена зависимость влияния времени сольволиза и содержания гидроксида щелочного металла в реакционной среде на прочность восстановленных стеклянных волокон. Оптимальным принят режим сольволиза при температуре 180 °С и концентрации катализатора 5% в течение 6 ч. В результате определен режим, позволяющий получать волокна с разрывной прочностью 92% прочности первичных волокон. Восстановленные ткани исследованы методами термического анализа и растровой электронной микроскопии. Из восстановленных тканей получены образцы стеклопластиков методом VaRTM. Прочность при трехточечном изгибе композитов из вторичного наполнителя на 8,5% ниже, чем такого же материала на основе первичной ткани.

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“…The main disadvantage of this method is an emission of a large amount of highly volatile products in the thermal destruction of the polymer matrix. Most articles also indicate a significant decrease in the strength of the recovered reinforcing materials obtained by this method [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Recycling of Epoxy/Fiberglass Composite Using Supercritical Ethanol with (2,3,5-Triphenyltetrazolium)2[CuCl4] Complex

Protsenko¹,

Protsenko²,

Shakirova³

et al. 2023

Polymers

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The widespread use of polymer composite materials (PCM) leads to an increase in non-recyclable waste. This paper discusses the feasibility of recycling fiberglass with an epoxy matrix by solvolysis in ethanol under supercritical conditions. The solvolysis process completes successfully within four hours in an environment of a pure solvent containing 10% water at a temperature of 280 °C when the solvent passes into the supercritical state. The treatment time increases up to 10 h at a process temperature of 250 °C. When using a coordination compound of copper(II) chloride with organic chloride salt having 2,3,5-triphenyltetrazolium as the counterion, having the composition of (2,3,5-triphenyltetrazolium)2[CuCl4], the treatment time is reduced. The addition of the complex of 5% by weight makes it possible to completely remove the epoxy matrix at a temperature of 250 °C for two hours. The products separated from the solvolysis liquid were studied by infrared spectroscopy. The resulting fibers were examined by thermogravimetric analysis and scanning electron microscopy. The residual strength of the recovered fibers is 98%. Thus, the resulting fibers can be reused in the composite industry. Including both for the production of decorative products and for the production of structural products made of polymer composite materials.

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Recycling of glass fibers sheets from thermoset reinforced plastic using thermolysis method

Cited by 9 publications

References 11 publications

Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

Рециклинг Стеклоармирующих Наполнителей Из Полимерных Композитов На Основе Эпоксивинилэфирного Связующего

Recycling of Epoxy/Fiberglass Composite Using Supercritical Ethanol with (2,3,5-Triphenyltetrazolium)2[CuCl4] Complex

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