Počet záznamov: 1
Particleboards prepared whit addition of copper sulphate
Názov Particleboards prepared whit addition of copper sulphate Časť.dok. Part 1. Biological resistance Aut.údaje Ladislav Reinprecht, Zuzana Vidholdová, Ján Iždinský Autor Reinprecht Ladislav TUZDFDT - Katedra drevárskych technológií Spoluautori Vidholdová Zuzana TUZDFDT - Katedra drevárskych technológií Iždinský Ján TUZDFDT - Katedra drevárskych technológií Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Roč. 59, č. 2 (2017), s. 53-60. - Zvolen : Technická univerzita vo Zvolene, 2017 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 630*862.2 579.8 582.281 630*844.2 Heslá drevotrieskové dosky - particleboards * sírany - sulphates * baktérie - bacteria * plesne - moulds - Phycomycetes * celulózovorné huby - brown-rot fungi * síran meďnatý - cooper sulphate Anotácia Protection of particleboards (PBs) with inorganic water soluble biocides (e.g. copper salts) can be recommended for indoor occasionally moistened expositions – i.e. at a random effect of condensate water or at a water leaking from damaged pipeline – lastin g a short time without damag e of the adhesion connections between wooden particles and glue. This work investigates biological resistance of the one layer PB s prepared by addition of copper sulphate pentahydrate (CuSO 4 .5H 2 O) into melamine - urea formaldehyde (MUF) glue in the amounts of 0, 2, 6, 12 or 24 w/w % . MUF glues containing copper biocide had, in presence of hardener NH 4 NO 3 , a shortened curing time from 198 to 117 s. Th is biocide evidently supressed occurrence of bacteria on the top surfaces of PBs , the gram - positive bacteria Staphylococcus aureus by u p to 76.5 % and the gram - negative bacteria Escherichia coli by u p to 50.0 % – i.e. the activity of bacteria at using a 0 . 5 McFarland standard inoculum ( 1 . 5 × 10 8 CFU/ml ) drop in 48 - hour tests from 0.17 to 0.04 × 10 8 CFU/ml for S. a ureus and from 0.18 to 0.09 × 10 8 CFU/ml for E. c oli . The copper biocide also increased u p to 44. 5 % the decay - resistance of PBs against the brown - rot fungus Coniophora puteana – i.e. the mass losses of the copper - modified PBs reduced at 6 - week tests f rom 1 7 . 38 % to 9 .6 4 % . However, the anti - mold efficacy of CuSO 4 .5H 2 O was a partly milder a t reducing growth of the microscopic fungi Penicillium brevicompactum and Aspergillus niger on the top surfaces of PB s – i.e. the activity of mold s was suppressed by up to 25.1 % and 31.5 % , when the molding degrees valued by the Standard STN 49 0604 reduced at 28 - day test s from 2.67 to 2.0 for P. brevicompactum and from 3. 17 to 2. 17 for A. n iger . URL https://df.tuzvo.sk/sites/default/files/05-02-17_0_0.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RZB - rozpis článkov zo zborníkov Odkazy PERIODIKÁ-Súborný záznam periodika Zväzky 2017: 1-2 
článok
Počet záznamov: 1