Utjecaj parametara izrade i naknadne obrade na svojstva epoksidne smole korištene u digitalnoj obradi svjetlom

undergraduate thesis

• Title (english): Influence of printing and post-treatment parameters on epoxy resin properties used in digital light processing
• Author: Marina Aščić
• Mentor: Domagoj Vrsaljko (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Filip Car (član povjerenstva)
• Committee member: Anita Šalić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Aditivna proizvodnja, poznata kao i 3D-ispis je tehnologija koja omogućuje stvaranje trodimenzionalnih predmeta sloj po sloj. Postupak proizvodnje započinje konstruiranjem modela u CAD (engl. Computer Aided Design) programu koji se potom sprema u STL format i prenosi na stroj za aditivnu proizvodnju. Nakon što se podese parametri stroja, započinje izrada prototipa, a nakon vađenja prototipa slijedi naknadna obrada, ako je potrebna.
Cilj ovog rada bio je odrediti utjecaj parametara izrade i postobrade na svojstva epoksidne smole korištene za 3D-ispis tehnologijom digitalne obrade svjetlom (DLP). Ova tehnologija temelji se na upotrebi 405 nm svjetla za očvršćivanje slojeva polimernog materijala. Ispitana je ovisnost mehaničkih, toplinskih i kemijskih svojstava o kutu ispisa te vremenu očvršćivanja u 405 nm komori. Smola korištena za 3D-ispis je smola na osnovi epoksida (AnyCubic 3D Printing UV Sensitive Resin). Rezultati ispitivanja pokazali su kako kut ispisa te trajanje naknadnog očvršćivanja utječu na mehanička i kemijska svojstva 3D-ispisanih epruveta. Epruvete ispisane pod kutom od 90° pokazuju najveću čvrstoću i žilavost, a najmanji modul elastičnosti. Kako se kut ispisa smanjuje, smanjuju se čvrstoća i žilavost pa tako epruvete ispisane pod kutom 0° imaju u pravilu najmanju čvrstoću i žilavost, ali najveći modul elastičnosti. Također, uzorci koji nisu naknadno obrađeni ili koji su kraće očvrsnuti pokazuju manju čvrstoću, ali veće prekidno istezanje i žilavost u odnosu na uzorke ispisane pod istim kutom, ali uz duže očvršćivanje. Ispitivanjem kemijskih svojstava bubrenjem u vodi, acetonu i metanolu može se zaključiti da svi uzorci bubre u određenoj mjeri u svim otapalima. Najveće stupnjeve bubrenja postižu uzorci bubreni u organskim otapalima acetonu i metanolu, dok voda kao anorgansko otapalo najmanje prodire u uzorke. Isto tako, primijećen je trend smanjenja apsorpcije otapala s porastom vremena izlaganja uzoraka zračenju u 405 nm komori. Prilikom ispitivanja toplinskih svojstava nije uočen značajan utjecaj parametara izrade i naknadne obrade na toplinska svojstva uzoraka. FTIR analizom potvrđene su karakteristične funkcionalne skupine i vibracije prisutne u 3D-ispisanim epruvetama te u uzorku tekuće smole.

Abstract (english)

Additive manufacturing, also known as 3D printing, is a technology that enables the creation of three-dimensional objects layer by layer. The manufacturing process begins with designing a model in CAD (Computer Aided Design) software, which is then saved in STL format and transferred to the additive manufacturing machine. After setting the machine parameters, the prototype production begins, followed by post-processing if necessary.
The aim of this study was to determine the influence of manufacturing and post-processing parameters on the properties of epoxy resin used for 3D printing with digital light processing (DLP). The dependence of mechanical, thermal, and chemical properties on the printing angle and curing time in a 405 nm chamber was examined. The resin used for 3D printing is epoxy-based resin (AnyCubic 3D Printing UV Sensitive Resin). The test results showed that the printing angle and duration of post-curing have an impact on the mechanical and chemical properties of the 3D printed test samples. Test samples printed at a 90° angle exhibit the highest strength and toughness, but the lowest elastic modulus. As the printing angle decreases, the strength and toughness decrease as well, so test samples printed at a 0° angle generally have the lowest strength and toughness, but the highest elastic modulus. Additionally, samples that were not post-processed or had shorter curing times show lower strength, but higher elongation at break and toughness compared to samples printed at the same angle but with longer post-curing. By examining the chemical properties through swelling in water, acetone, and methanol, it can be concluded that all samples swell to a certain extent in all solvents. The highest degree of swelling is achieved by samples swollen in organic solvents such as acetone and methanol, while water, as an inorganic solvent, penetrates the samples to the least extent. Additionally, a trend of decreasing solvent absorption was observed with an increase in the exposure time of the samples to radiation in the 405 nm chamber. During the examination of thermal properties, no significant influence of manufacturing and post-processing parameters on the thermal properties of the samples was observed. FTIR analysis confirmed the presence of characteristic functional groups and vibrations in the 3D printed test tubes and in the liquid resin sample.

• Keywords: aditivna proizvodnja; DLP tehnologija; epoksidne smole; naknadno očvršćivanje
• Keywords (english): additive manufacturing; DLP technology; epoxy resins; post-curing
• Language: croatian
• URN:NBN: urn:nbn:hr:149:259197
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-11-29 12:30:48