Optimiranje recepture EPDM izolacijske gumene mješavine s ciljem smanjenja utroška energije potrebne za vulkanizaciju

master's thesis

• Title (english): Optimization of insulation EPDM rubber compound with the aim of vulcanization energy saving
• Author: Matija Bjelobradić
• Mentor: Ante Jukić (mentor)
• Committee member: Ante Jukić (predsjednik povjerenstva)
• Committee member: Fabio Faraguna (član povjerenstva)
• Committee member: Marijana Kraljić Roković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-09-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Tijekom reakcije kopolimerizacije etilena s propilenom dodavanjem malih udjela trećeg, dienskog komonomera nastaje EPDM. S obzirom na potpunu zasićenost osnovnog lanca odnosno nedostatak dvostrukih veza, vrlo su postojani na utjecaj kemijskih agensa, posebice kisika i ozona te prema starenju materijala. Područje primjene EPDM-a su posebne brtve izložene atmosferilijama, kablovi, obloge za spremnike i uređaje, a upotrebljava se i kao dodatak prirodnom i SBR-kaučku u proizvodnji pneumatika. U ovom radu proveden je proces umrežavanja EPDM-a monofunkcionalnim i difunkcionalnim peroksidom te je ispitan utjecaj koncentracije umreživača, koncentracije aktivatora i temperature umrežavanja na svojstva priređenih guma. Dobiveni uzorci analizirani su nizom metoda: diferencijalnom pretražnom kalorimetrijom (DSC), kidalicom, tvrdomjerom, određivanjem trajne deformacije sabijanjem na određenu visinu, infracrvenom spektroskopijom (FTIR), te pretražnim elektronskim mikroskopom (SEM). U svim uzorcima se uz pomoć DSC metode utvrdio udjel neizreagiranog peroksida. Mehanička svojstva ispitana su pomoću kidalice. Kod uzoraka umreženih pri temperaturi 170 °C zaostalo je više peroksida nego kod uzoraka umreženih pri 180 °C gdje je sav peroksid u zadanom vremenu izreagirao. Uzorci s većom količinom neizreagiranog peroksida pokazali su bolja mehanička svojstva. Povećanje temperature je negativno utjecalo na svojstva uzoraka, jer su dobiveni "preumreženi" uzorci.

Abstract (english)

By adding a small share of the third diene comonomer during the copolymerization reaction of ethylene with propylene EPDM is produced. Due to the complete saturation of the molecule backbone or the lack of double bonds, EPDM is highly resistant to the aging and to the impact of chemical agents, particularly oxygen and ozone. EPDM is used as special atmosphere exposed seals, cables, as a coating for tanks/devices and as a supplement to natural and styrene-butadiene-rubber in the production of tires. In this paper a process of cross-linking of EPDM with monofunctional and difunctional peroxides were performed. The effect of the concentration of crosslinking agents, activators and curing temperature on the properties of the prepared rubbers was investigated. The obtained samples were analyzed by several methods: differential scanning calorimetry (DSC), tensile testing machine, hardness tester, determination of resistance to compression, infrared spectroscopy (FTIR), and scanning electron microscope (SEM). In all samples the content of unreacted peroxide was determined by using DSC. Mechanical properties were examined using the testing machine. EPDM samples cured at 170 °C had higher concentration of unreacted peroxide than the samples cured at 180 °C where all the peroxide reacted in a given time. Samples with higher amount of unreacted peroxide showed superior properties. The increase in temperature has a negative impact on the mechanical properties because of samples overcure.

• Keywords: EPDM; umrežavanje; monofunkcinalni peroksid; difunkcionalni peroksid; aktivator; mehanička svojstva
• Keywords (english): EPDM; cross-linking; monofunctional peroxide; difunctional peroxide; activator; mechanical properties
• Language: croatian
• URN:NBN: urn:nbn:hr:149:856543
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-03-13 13:28:20