ACTA TECHNICA CORVINIENSIS - Bulletin of Engineering

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ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGACTA TECHNICA CORVINIENSIS– BULLETIN of ENGINEERINGISSN: 2067-3809 [CD-Rom, online]copyright ©University Politehnica Timisoara,Faculty of Engineering Hunedoara,5, Revolutiei,331128, Hunedoara,ROMANIAhttp://acta.fih.upt.roANNALSofFACULTY ENGINEERING HUNEDOARA– INTERNATIONALJOURNAL of ENGINEERINGISSN: 1584-2665 [print, online]ISSN: 1584-2673 [CD-Rom, online]copyright ©University Politehnica Timisoara,Faculty of Engineering Hunedoara,5, Revolutiei,331128, Hunedoara,ROMANIAhttp://annals.fih.upt.ro202010/Fascicule 2/AprilJune /Tome III
1.JIŘÍ BOBEKINJECTION MOLDED BIODEGRADABLE POLYMER STUDYAbstract:This paper is next of the papers series which is biodegradable plastics properties considering.Concretely biopolymer HL103 was chosen for this series. Biologic degradation was realized in naturecompost and acid and alkaline solution. Mechanical properties change was observed in dependenceon time after production. Testing specimen production was realized by injection molding.Keywords:biodegradable, plastics, mechanical, testsINTRODUCTIONThe world most used plastics PE and PPbiodegradability improving modification issearched due to their large produced volume. Itis not easy to find right PE or PP modificationwhich is acceptable with regard to ecologic site.Some PE and PP applications – concretelyvarious packaging application is possible tosubstitute not with modified PE or PP but withentirely different materials – fully biodegradableplastics. Behavior knowledge of these materialsis necessary to successful using these materials.Fully biodegradability of all materialcomponents is the basic advantage comparingto conventional petrolic polymers.For this study was proposed experiment whichshould simulate concrete conditions of plasticparts using. Biodegradable polymer behaviorduring this conditions (which are describedbelow) is observed in dependence to time afterproduction.Experiment is using for observation normalizedtesting specimens which were produced bynormalized molds with injection molding onconventional molding machine – ENGELVICTORY 80/25.Observation is based on next mechanicalproperties tests:• tensile test (ČSN EN ISO 527-1,2,• flexural test (ČSN EN ISO 178),• impact IZOD test (ČSN EN ISO 180),• Shore D hardness test (ČSN EN ISO 868)[1][2][3][4]and specimens (see fig. 1) surface analysis.flexural test specimenimpact strength test specimentensile test specimenFig. 1 Mechanical properties test specimensMechanical properties as same as surfaceappearance are observed 1 st , 10 th , 20 th , 30 th , 40 th ,50 th and 60 th day after production.Specimens (see fig. 1) are immediately afterproduction placed to four another areas whichshould simulate real plastics using conditions.The first area is water solution with neutral pH(7±0,2), second area is water solution with acidic© copyright FACULTY of ENGINEERING – HUNEDOARA, ROMANIA 21
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