Kemijsko recikliranje kompozitnih materialov z vgrajenimi steklenimi vlakni

magistrsko delo

Vesna Žlender (Author), Julija Volmajer Valh (Mentor), Bojana Vončina (Co-mentor)

Abstract

Vse večja uporaba kompozitnih materialov z vgrajenimi steklenimi vlakni je povečala ozaveščenost o metodah s katerimi bi lahko reciklirali odslužene kompozite, material pa ponovno uporabili. Tone kompozitnih odpadkov iz različnih aplikacij, ki vsebujejo dragocena steklena vlakna, se vsako leto kopičijo. Te sestavljene odpadke je treba stroškovno učinkovito reciklirati, ne da bi povzročili negativen vpliv na okolje. Magistrsko delo predstavlja pregled obstoječih metod recikliranja kompozitnih odpadkov z vgrajenimi steklenimi vlakni, s poudarkom na ohranitvi vlaken in njihovih lastnosti. Največ pozornosti smo namenili metodam kemijskega recikliranja in sicer depolimerizacijskim metodam. Z njimi smo želeli ločiti vlakna od polimernega nosilca, prav tako pa smo želeli ohraniti mehanske lastnosti vlaken. Odločili smo se za postopke nevtralne in alkalne hidrolize ter za aminolizo. Posvetili smo se tudi vplivu reakcijskih pogojev na produkt nevtralne in alkalne hidrolize, predvsem vpliva reakcijskega časa. Iskali smo tudi najboljše načine, kako izolirati končne produkte. Kljub temu, da pri nevtralni in alkalni hidrolizi nismo pridobili nepoškodovanih steklenih vlaken, smo s pomočjo bazno-kislinske ekstrakcije pridobili monomerno enoto polimernega nosilca to je tereftalno kislino. Med tem, ko smo pri postopku aminolize poleg depolimerizacijskega produkta polimernega nosilca BHET (bis(2-hidroksietil)tereftalat) pridobili tudi nepoškodovana steklena vlakna.

Keywords

steklena vlakna;kompozitni materiali;nevtralna hidroliza;alkalna hidroliza;aminoliza;tereftalna kislina;BHET - Bis (2-hidroksietil) tereftalat;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.09 - Master's Thesis
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	[V. Žlender]
UDC:	66.094.941:666.189.21(043.2)
COBISS:	105026563
Views:	233
Downloads:	41
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Chemical recycling of glass fibre reinforced composites
Secondary abstract:	The increasing use of glass reinforced composites has raised awareness of methods by which be used composite can be recycled and the material reused. Every year, tons of composite waste is generated from various applications that contain valuable glass fibers. This composite waste need to be recycled in a cost effective manner without causing a negative impact on the environment. This master thesis gives an overview of existing methods for recycling composite waste with embedded glass fibers, focusing on the preservation of the fibers and their properties. We paid the most attention to chemical recycling methods, namely depolymerization methods. We wanted to use them to separate the fibers from the polymer carrier, and also to preserve the mechanical properties of the fibers. We chose neutral and alkaline hydrolysis processes and aminolysis. We also focused on the influence of reaction conditions on the product of neutral and alkaline hydrolysis, especially the influence of reaction time. But we also looked for the best ways to isolate the end products. Although no intact glass fibers were obtained by neutral and alkaline hydrolysis, monomeric unit of polymer carrier-terephthalic acid was obtained by base-acid extraction. In the process of aminolysis, undamaged glass fibers were obtained in addition to the depolymerization product of the polymeric carrier BHET (bis(2-hydroxyethyl)terephthalate.
Secondary keywords:	glass fibers;composite materials;neutral hydrolysis;alkaline hydrolysis;aminolysis;terephthalic acid;BHET - Bis(2-Hydroxyethyl) terephthalate;
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za strojništvo, Tehniško varstvo okolja
Pages:	XII, 48 f.
ID:	13488178