Title Priprema naprednih funkcionalnih filamenata Title (english) Preparation of advanced functional filaments Author Gabriela Brnadić Mentor Domagoj Vrsaljko (mentor)Committee member Domagoj Vrsaljko (predsjednik povjerenstva)Committee member Krunoslav Žižek (član povjerenstva)Committee member Igor Dejanović (član povjerenstva)Granter University of Zagreb Defense date and country 2019-07-12, Croatia Scientific / art field, TECHNICAL SCIENCES Abstract Aditivna tehnologija, poznatija pod nazivom tehnologija 3D-ispisa, omogućuje izradu širokog spektra proizvoda u kratkom vremenskom periodu, postupkom nanošenja materijala sloj po sloj. Izrada proizvoda temelji se na računalnom CAD (engl. Computer-aided design) modelu, pri čemu se od konačnog produkta 3D-ispisa zahtjeva određena mehanička stabilnost, kvaliteta, dimenzijska točnost i preciznost. U postupcima aditivne proizvodnje moguće je koristiti niz različitih materijala, a najčešće se koriste polimerni materijali. U ovome radu izrađeni su monolitni nosači s ugrađenom katalitički aktivnom tvari različitih masenih udjela (1 %, 5 %, 7,5 % i 10 %). Monolitni nosači katalizatora u praksi nalaze široku primjenu u obradi otpadnih plinova, a primjenom tehnologije 3D-ispisa otvaraju se mogućnosti izrade takvih nosača od različitih materijala i složenijih struktura koje bi konvencionalnim postupcima bilo vrlo teško postići. Provedena je termogravimetrijska analiza devet komercijalnih polimernih materijala, na osnovu čega su odabrana dva toplinski najstabilnija (Z-PCABS i Z-GLASS) jer pokazuju najmanje gubitke mase pri povišenim temperaturama. Zatim su izrađeni testni nosači na osnovu kojih se odabrala najstabilnija struktura kanala monolita, te su na tim materijalima provođeni testovi postojanosti oblika na povišenim temperaturama, gdje se polimer Z-PCABS pokazao stabilnim na temperaturi 170 °C. U polimerni materijal Z-GLASS procesom ekstrudiranja umiješana je katalitički aktivna tvar titanijev(IV) oksid (TiO2) u navedenim masenim udjelima, tako da su dobiveni funkcionalni filamenti promjera pogodnih za 3D-ispis. Tehnologijom proizvodnje rastaljenim filamentom (engl. Fused Filament Fabrication, FFF) izrađeni su monolitni nosači katalizatora, od pripravljenih filamenata, a postepeni porast koncentracije TiO2 u izrađenim nosačima vidljiv je po pojačanom intenzitetu bijele boje. Dobiveni funkcionalni filamenti karakterizirani su na način da su im ispitana mehanička svojstva, određeni maseni protoci taljevina, te provedbom termogravimetrijske analize.
Abstract (english) Additive manufacturing, better known as 3D-printing, allows the production of a wide range of products over a relatively short time period, making objects by applying material layer-by-layer. Product design is based on a computer CAD (Computer-aided design) model, whereby the final 3D-printed product requires the appropriate quality, mechanical properties, dimensional accuracy and precision. Wide range of materials can be used in additive manufacturing processes. In this paper monolithic catalyst supports were made with different weight ratios of catalyst (1 %, 5 %, 7,5 % and 10 %). Monolithic catalyst supports in practice have a wide application in waste gas treatment and by using 3D-printing technology it is possible to produce catalyst supports of different materials and complex structures, which would be very difficult to achieve by conventional methods. Nine commercial polymeric materials were characterized by thermogravimetric analyses. Based on this results two of the most high-temperature stable materials (Z-PCABS and Z-GLASS) were chosen. Then monolithic supports based on the most stable canal structure were produced. These materials shape stability was tested at high-temperature (170 °C). By extrusion processes, Z-GLASS polymeric material was mixed with catalytically active titanium(IV) oxide (TiO2) and functional filaments that could be used in additive manufacturing were prepared. Those functional filaments were used for printing monolithic catalyst supports by fused filament fabrication (FFF). The gradual increase of the TiO2 concentration in prepared monoliths is visible in higher intensity of white color. Functional filaments were characterized by the mechanical properties, melt flow rate (MFR) and thermogravimetric analysis.
Keywords
aditivna proizvodnja
proizvodnja rastaljenim filamentom
polimeri
ekstrudiranje
monolitni nosači katalizatora
Keywords (english)
additive manufacturing
fused filament fabrication
polymers
extrusion
monolithic catalyst supports
Language croatian URN:NBN urn:nbn:hr:149:027431 Project Number: UIP-2014-09-3154 Study programme Title: Chemical Engineering - Graduate study Type of resource Text File origin Born digital Access conditions Open access Terms of use Created on 2022-02-16 13:15:21
