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Uporaba polivinil alkohola z dodatkom nanoceluloze za površinsko zaščito lesa
ID Mikelj, Miha (Author), ID Petrič, Marko (Mentor) More about this mentor... This link opens in a new window, ID Žigon, Jure (Comentor)

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Abstract
Cilj diplomske naloge je bil ugotoviti lastnosti premaza iz polivinil alkohola (PVA) z dodatkom nanoceluloze in brez njega za zaščito površin lesa ter vpliv nanoceluloze na mehanske lastnosti premaza. V okviru raziskav smo uporabili šest različnih premazov, ki smo jih nanesli v dveh debelinah, in sicer 240 μm in 360 μm. Uporabili smo premaze z 10, 15 in 20 % koncentracijo PVA v vodi in 5% dodatek nanoceluloze. Za potrebe raziskave smo pripravili vzorce iz bukovega in smrekovega lesa. En vzorec iz vsakega lesa je bil neobdelan in je služil kot kontrolni vzorec. Ugotavljali smo izbrane lastnosti tvorjenih površinskih sistemov. Preizkusi nekaterih lastnostih so pokazali povezavo med deležem PVA v premazu oziroma dodatkom nanoceluloze z boljšimi odpornostnimi oziroma mehanskimi lastnostmi površinskih sistemov, medtem ko pri nekaterih lastnostih delež PVA in dodatek nanoceluloze nista imela vpliva na lastnosti površinskega sistema. Dodatek nanoceluloze je pozitivno vplival na oprijem premazov in na odpornost površin proti mikrorazenju, medtem ko pri drugih preizkušenih lastnostih ni bilo jasno vidnega učinka vpliva nanoceluloze na izboljšanje lastnosti. Pri ugotavljanju odpornosti površin proti hladnim tekočinam je prisotnost nanoceluloze predstavljala celo obremenilni dejavnik. Pri premazih iz PVA so preizkusi pokazali, da višji delež PVA v premazu ne zagotavlja nujno boljših lastnosti površin. Debelejši nanos ravno tako ne zagotavlja nujno boljših odpornostnih lastnosti, kot tanjši.

Language:Slovenian
Keywords:polivinil alkohol, nanofibrilirana celuloza, premazi, debelina nanosa, hidrofobnost, mehanske lastnosti
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Place of publishing:Ljubljana
Publisher:[M. Mikelj]
Year:2022
PID:20.500.12556/RUL-139036 This link opens in a new window
UDC:630*829.1:547.458.8
COBISS.SI-ID:119559427 This link opens in a new window
Publication date in RUL:29.08.2022
Views:809
Downloads:61
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Secondary language

Language:English
Title:The use of polyvinyl alcohol with addition of nanocellulose for surface protection of wood
Abstract:
The aim of the thesis was to determine the properties of polyvinyl alcohol (PVA) coating with the addition of nanocellulose and without it with regard to protecting wood surfaces, and the impact of nanocellulose on the mechanical properties of the coating. We used six different coatings, which were applied in two thicknesses, namely 240 μm and 360 μm. We used coatings with a 10, 15 and 20% concentration of PVA in water and 5% addition of nanocellulose. The samples which we applied the coatings on were made from spruce and beech wood. One sample from each wood was untreated and served as a control sample. We determined the selected properties of the surface systems that formed. The tests of some of the properties showed the impact of the addition of nanocellulose and a higher content of PVA in the coating with regard to achieving better mechanical or resistance properties, while some properties were not affected by the enhanced properties of the surface system. The addition of nanocellulose had a positive effect on the adhesion of coatings and on the resistance to micro-destruction. However, the addition of nanocellulose did not have a clear effect with regard to improving the other properties that were examined. In fact, the addition of nanocellulose weakened the resistance against cold liquids. The results show that a higher proportion of PVA does not necessary provide better surface properties. A thicker coating also does not necessarily lead to better properties than a thinner one.

Keywords:polyvinyl alcohol, nanofibrillated celluose, coatings, coating thickness, hydrophobicity, mehanical properties

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