Milan Šernek (Author), Vanja Lavk (Author), Rožle Repič (Author), Bogdan Šega (Author)

Abstract

Odpadne plastike je čedalje več, zato poskušamo najti različne načine njenega recikliranja in ponovne uporabe. Reciklirani termoplastični polimeri predstavljajo zanimiv potencial za izdelavo lepil, zato je bil cilj naše preliminarne raziskave proučiti primernost odpadnega polistirena za izdelavo lepil za lepljenje lesa. Lepilne mešanice smo izdelali tako, da smo odpadne polistirenske lončke (L) in žličke (Ž) za kavo razrezali na manjše koščke in jih ločeno raztopili v 5 različnih topil: butil acetat (BA), dimetilformamid (DMF), tetrahidrofuran (THF), limonen (L) in aceton (AC). Z njimi smo izdelali lepljence iz dveh bukovih lamel (Fagus sylvatica L.), ki smo jih 10 minut stiskali v hidravlični stiskalnici pri temperaturi 150 °C in tlaku 12 barov. Za ugotavljanje kakovosti zlepljenosti smo izvedli strižni preizkus z univerzalnim testirnim strojem Zwick/Roell Z005. Ugotovili smo, da so preizkušanci, zlepljeni z lepilno mešanico Ž-DMF, dosegli povprečno strižno trdnost 6,5 N/mm2, preizkušanci, zlepljeni z L-DMF, pa 3,8 N/mm2. Vsi ostali preizkušanci so izkazovali nižjo trdnost lepilnega spoja oziroma so večinoma razpadli že po vročem stiskanju ali kasneje med žaganjem v preizkušance. V nadaljnjih raziskavah bomo obetajoči lepilni mešanici modificirali in optimizirali parametre stiskanja z namenom doseganja kakovosti zlepljenosti, ki ustreza standardnim zahtevam za plastomerna lepila za notranjo uporabo.

Keywords

les;lepilo;odpadna plastika;polistiren;strižna trdnost;ponovna uporaba plastike;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 630*824.8:678.86
COBISS: 44805635 Link will open in a new window
ISSN: 0024-1067
Parent publication: Les
Views: 705
Downloads: 238
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Other data

Secondary language: English
Secondary title: Use of waste plastics for the preparation of adhesives for wood bonding
Secondary abstract: There is more and more plastic waste, so we try to find different ways to recycle and reuse it. Recycled thermoplastic polymers represent an interesting potential for the production of adhesives, so the aim of our preliminary investigations was to examine the suitability of waste polystyrene for the production of adhesives for wood bonding. The adhesive mixtures were prepared by cutting the waste polystyrene cups (L) and coffee spoons (Ž) into smaller pieces and dissolving them separately in 5 different solvents: Butyl acetate (BA), Dimethylformamide (DMF), Tetrahydrofuran (THF), Limonene (L) and Acetone (AC). From these we prepared composite samples of two beech lamellae (Fagus sylvatica L.), which were pressed for 10 minutes in a hydraulic press at a temperature of 150 °C and a pressure of 12 bar. In order to determine the quality of the bonding, we carried out a shear test with a Zwick/Roell Z005 universal testing machine. We found that the test specimens bonded with the adhesive mixture Ž-DMF achieved an average shear strength of 6.5 N/mm2 and the test specimens bonded with L-DMF achieved 3.8 N/mm2. All other test specimens showed a lower strength of the adhesive bonds, or they mostly delaminated after hot pressing or later during sawing into test specimens. In further research work we will modify these promising adhesive mixtures and optimize the pressing parameters in order to achieve bonding quality that meets the standard requirements for thermoplastic adhesives for interior applications.
Secondary keywords: wood;adhesive;waste plastics;polystyrene;shear strength;reuse of plastic;
URN: URN:NBN:SI
Type (COBISS): Article
Pages: str. 107-116
Volume: ǂLetn. ǂ69
Issue: ǂšt. ǂ2
Chronology: 2020
DOI: 10.26614/les-wood.2020.v69n02a08
ID: 12717712