Počet záznamov: 1
Particleboards prepared whit addition of copper sulphate
SYS 0092753 LBL 00000naa^^22^^^^^^^^450 005 20171026102348.8 017 70
$a 10.17423/afx.2017.59.2.05 $2 DOI 100 $a 20171026d m y0sloc0103 ba 101 0-
$a eng 102 $a SK 200 1-
$a Particleboards prepared whit addition of copper sulphate $h Part 1 $i Biological resistance $f Ladislav Reinprecht, Zuzana Vidholdová, Ján Iždinský 215 $c Obr., tab. 320 $a Lit. 330 $a 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 . 463 -1
$1 001 sldk_un_cat*0092723 $1 011 $a 1336-3824 $1 200 1 $a Acta Facultatis Xylologiae Zvolen $e vedecký časopis Drevárskej fakulty $v Roč. 59, č. 2 (2017), s. 53-60 $1 210 $a Zvolen $c Technická univerzita vo Zvolene $d 2017 610 1-
$9 sldk_un_auth*h016455 $a drevotrieskové dosky $X particleboards 610 1-
$9 sldk_un_auth*h021413 $a sírany $X sulphates 610 1-
$9 sldk_un_auth*h012825 $a baktérie $X bacteria 610 1-
$9 sldk_un_auth*h008968 $a plesne $X moulds $Y Phycomycetes 610 1-
$9 sldk_un_auth*h033831 $a celulózovorné huby $X brown-rot fungi 610 1-
$9 sldk_un_auth*0047333 $a síran meďnatý $X cooper sulphate 675 $a 630*862.2 $v 1. stred. $z slo 675 $a 579.8 $v 1. stred. $z slo 675 $a 582.281 $v 1. stred. $z slo 675 $a 630*844.2 $v 1. stred. $z slo 700 -1
$3 sldk_un_auth*p0028092 $a Reinprecht $b Ladislav $f 1953- $p TUZDFDT $4 070 $T Katedra drevárskych technológií 701 -1
$3 sldk_un_auth*p0017466 $a Vidholdová $b Zuzana $f 1975- $p TUZDFDT $4 070 $T Katedra drevárskych technológií 701 -1
$3 sldk_un_auth*p0041666 $a Iždinský $b Ján $f 1977- $p TUZDFDT $4 070 $T Katedra drevárskych technológií 801 -0
$a SK $b ZV001 $c 20171026 $g AACR2 856 4-
$u https://df.tuzvo.sk/sites/default/files/05-02-17_0_0.pdf
Počet záznamov: 1