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Vpliv dodanega tanina na lastnosti lepila iz utekočinjenega lesa : diplomsko delo - univerzitetni študij
Tratar, Klemen (Author), Šernek, Milan (Mentor) More about this mentor... This link opens in a new window, Gornik Bučar, Dominika (Reviewer)

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Abstract
S težnjo po celostni izrabi lesne surovine se veliko raziskav usmerja v izdelavo utekočinjenega lesa in njegovo rabo v različnih aplikacijah. Ker je lepljenje ena izmed pomembnejših faz v lesarstvu, smo poizkušali narediti novo lepilo na osnovi utekočinjenega lesa po trenutnih ekoloških trendih. Preizkusili smo različne kombinacije lepilnih mešanic na osnovi utekočinjenega lesa z dodatkom tanina in formalina. Kakovost lepil smo preverjali z ugotavljanjem strižne trdnosti lepilnega spoja. Lepilo iz čistega utekočinjenega lesa je doseglo 64,5 % zahtevane trdnosti v trajnostnem razredu C1. Ugotovili smo, da z dodajanjem tanina le znižujemo trdnost in pospešujemo dovzetnost razpada lepilnega spoja v stiku z vodo. V lepilu je tanin očitno deloval zgolj kot polnilo, saj ni bilo izboljšanja trdnosti lepilnega spoja. Z namenom po doseganju višjih strižnih trdnosti smo nadaljnje preizkuse omejili na lepilne mešanice utekočinjenega lesa in formalina. Koncentracije smo zviševali vse do 50 % deleža formalina in dosegli 77 % zahtevane trdnosti po trajnostnem razredu C1. Ugotovili smo, da formalin delno izboljša odpornost lepilnega spoja na delovanje vode in skrajšuje odprte čase lepilne mešanice

Language:Slovenian
Keywords:les, utekočinjen les, tanin, formalin
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2015
Publisher:[K. Tratar]
Number of pages:IX, 56 f.
UDC:630*813
COBISS.SI-ID:2430345 Link is opened in a new window
Views:77
Downloads:20
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Secondary language

Language:English
Title:Influence of tannin aditive on the adhesive properties of liquefied wood
Abstract:
Aspiring for an integral use of wood raw material, many a research focuses on producing liquefied wood, and its use in different applications. Since gluing is one of the more important phases in wood working, we tried to make a new liquefied wood-based adhesive according to current ecological trends. We tested different combinations of liquefied wood-based adhesive mixtures with the addition of tannin and formalin. Adhesive quality was tested through establishing the shear strength of the adhesive bond. Pure liquefied wood reaches 64.5 % of required strength in durability class C1. We established that adding tannin only lowers strength and increases susceptibility to delamination in contact with water. Obviously tannin acts as filler since there was no straight improvement of adhesive bond. With the intention to achieve higher shear bond strength, we limited further tests to adhesive mixtures of liquefied wood and formalin. We raised the concentration up to 50 % formalin share and achieved 77 % of required strength according to durability class C1. We have established that formalin lowers adhesive bond susceptibility to water and reduces open times of adhesive mixture

Keywords:wood, liquefied wood, tannin, formalin

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