scholarly journals Dielectric properties of paraffin wax emulsion/copper azole compound system treated wood

2019 ◽  
Vol 12 (2) ◽  
pp. 199-206
Author(s):  
Y Liao ◽  
E Ma ◽  
R Liu
Keyword(s):  
Dielectric Properties ◽  
Treated Wood ◽  
Paraffin Wax ◽  
Compound System ◽  
Copper Azole

scholarly journals Effect of Concrete on the pH and Susceptibility of Treated Pine to Decay by Brown-Rot Fungi

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 41 ◽  
Author(s):  
Darrel Nicholas ◽  
Amy Rowlen ◽  
David Milsted
Keyword(s):  
Treated Wood ◽  
Untreated Wood ◽  
Brown Rot ◽  
Consistent Difference ◽  
Ground Contact ◽  
Decay Fungi ◽  
Brown Rot Fungi ◽  
Organic Systems ◽  
Decay Tests ◽  
Copper Azole

Treated wood timbers employed in ground contact are often installed with a cement collar to firmly fix the structural wood post in place. Few prior studies have determined the effect of concrete on decay efficacy on treated wood, however. Treated wood nominal 4 × 4 posts were installed at four locations, with the upper ground-contact portion of each post encased in concrete, and the samples removed at various times for pH measurements. The wood alkalinity quickly increased at all four sites for the portion of the treated wood in concrete contact compared to the wood in ground contact without concrete. In laboratory decay tests employing three decay fungi, untreated wood which was first exposed or unexposed to concrete had no consistent difference in decay susceptibility. For wood treated with three different commercial copper/organic systems, cement exposure had no effect on wood treated with an amine copper azole system, while treatment with amine copper quat showed a statistically significant fungal efficacy enhancement for cement-exposed samples with both copper-tolerant fungi. Conversely, with a micronized copper azole preservative, cement exposure resulted in reduced fungal efficacy compared to treated samples which were not cement-exposed for all three decay fungi.

Counter-current acid leaching process for copper azole treated wood waste

2012 ◽  
Vol 33 (18) ◽  
pp. 2111-2118 ◽  
Author(s):  
Amélie Janin ◽  
Pauline Riche ◽  
Jean-François Blais ◽  
Guy Mercier ◽  
Paul Cooper ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Treated Wood ◽  
Wood Waste ◽  
Leaching Process ◽  
Copper Azole ◽  
Counter Current

Prediction of long-term leaching potential of preservative-treated wood by diffusion modeling

Holzforschung ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 581-588 ◽  
Author(s):  
Levi Waldron ◽  
Paul A. Cooper ◽  
Tony Y. Ung
Keyword(s):  
Diffusion Coefficient ◽  
Treated Wood ◽  
Free Water ◽  
Wood Preservative ◽  
Copper Component ◽  
Equilibrium Dissociation ◽  
Disodium Octaborate Tetrahydrate ◽  
Alkaline Copper Quaternary ◽  
Copper Azole ◽  
Copper Amine

Abstract An approach to modeling leaching and leaching impacts of preservative components from treated wood is presented based on three simple laboratory determinations: the amount of preservative component available for leaching (Le), equilibrium dissociation of preservative into free water in wood (Di) and diffusion coefficients for component leaching in different wood directions (D). In this study, the following inorganic wood preservative systems were investigated: chromated copper arsenate (CCA), the copper component of copper azole (CA) and alkaline copper quaternary (ACQ), and boron in disodium octaborate tetrahydrate (DOT). Aggressive leaching of finely ground wood showed that amounts of preservative compounds available for leaching were highest for borates, followed by copper in copper amine systems and arsenic in CCA, copper in CCA and chromium in CCA. The equilibrium dissociation or solubility of components in free water in the wood was much higher for borates and copper amine, followed by copper and arsenic in CCA and chromium in CCA. Use of the applicable diffusion coefficient (D) and Di or Le values in a diffusion model allows the prediction of total amount leached and emission or flux rate at different times of exposure for products with different dimensions and geometries. The approach was tested and generally validated through application of the model to results of laboratory water spray leaching of full-size lumber samples. The approach explains the rapid leaching of boron compounds (large diffusion coefficient and high initial dissociated concentration) compared to other preservative components and predicts that ACQ will have higher initial leaching rates compared to CCA and CA, but the latter preservatives will continue to leach copper at a measurable rate for a much longer time. The practical implications and limitations of the approach are discussed.

scholarly journals In vitro bioaccessibility of copper azole following simulated dermal transfer from pressure-treated wood

2017 ◽  
Vol 598 ◽  
pp. 413-420 ◽  
Author(s):  
Jennifer L. Griggs ◽  
Kim R. Rogers ◽  
Clay Nelson ◽  
Todd Luxton ◽  
William E. Platten ◽  
...  
Keyword(s):  
Treated Wood ◽  
In Vitro Bioaccessibility ◽  
Copper Azole

Biological performance of copper azole-treated wood and wood-based composites

Holzforschung ◽  
2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Cihat Tascioglu ◽  
Kunio Tsunoda
Keyword(s):  
Oriented Strand Board ◽  
Medium Density Fiberboard ◽  
Treated Wood ◽  
Coptotermes Formosanus ◽  
White Rot ◽  
White Rot Fungus ◽  
Vacuum Impregnation ◽  
Decay Fungi ◽  
Biological Resistance ◽  
Copper Azole

Abstract Vacuum-impregnation with copper azole was applied as a post-treatment to five commercially available wood-based composites with thicknesses of approximately 12 mm, such as softwood plywood (SWP), hardwood plywood (HWP), medium density fiberboard (MDF), oriented strand board (OSB), and particleboard (PB). Untreated and treated composites were tested for their resistance to decay fungi (brown rot fungus Fomitopsis palustris and white rot fungus Trametes versicolor) and the subterranean termite Coptotermes formosanus by Japanese standardized laboratory test methods. Untreated MDF was highly resistant to both biological attacks and seemed to require no preservative treatment under less hazardous conditions, i.e., under protected and above-ground applications, with possible occasional wetting. PB was ranked second, and needed further protection only against C. formosanus. Copper azole did not adequately protect SWP from F. palustris and termite. OSB was not protected either against F. palustris and T. versicolor even at a concentration level of 1 kg copper azole per m3 in contrary to blocks of Cryptomeria japonica sapwood, which was protected at these concentration levels. The biological resistance of HWP was reasonably improved by copper azole. The performance of wood-based composites treated with copper azole, which was inferior to the biological resistance of treated C. japonica sapwood blocks, might depend on the thickness or layer profile, density as a result of porosity, uneven distribution of the preservative in the composites, and the susceptibility of the component raw materials.

Penetration and distribution of paraffin wax in wood of loblolly pine and Scots pine studied by time domain NMR spectroscopy

Holzforschung ◽  
2018 ◽  
Vol 72 (2) ◽  
pp. 125-131 ◽  
Author(s):  
Wang Wang ◽  
Yiheng Huang ◽  
Jinzhen Cao ◽  
Yuan Zhu
Keyword(s):  
Scots Pine ◽  
Loblolly Pine ◽  
Time Domain ◽  
Treated Wood ◽  
Weight Percent Gain ◽  
Contact Angles ◽  
Solid Content ◽  
Paraffin Wax ◽  
Distribution Data ◽  
Water Contact

AbstractImpregnation of wood with paraffin wax emulsion (PWE) is a common eco-friendly approach for improving water repellency. In this study, loblolly pine (Pinus taeda) and Scots pine (Pinus sylvesteris) samples were impregnated with PWEs with different solid contents and particle sizes, and the influence of the impregnation parameters on wax penetration and distribution in treated wood was elucidated by time domain nuclear magnetic resonance (TD-NMR). A good linear correlation (R2=0.981) between wax content determined by TD-NMR and weight percent gain (WPG) of the impregnated wood was established. According to wax loading and distribution data, loblolly pine has a much better permeability than Scots pine. With decreasing solid content and particle size, the penetration of PWE increases in both species. The water contact angles (CA) on the surface at different depths of wood were also determined, and the CA results were consistent with the wax distribution found by the TD-NMR analysis.

Properties of wood treated with compound systems of paraffin wax emulsion and copper azole

2016 ◽  
Vol 76 (1) ◽  
pp. 315-323 ◽  
Author(s):  
Jiamin Wang ◽  
Hui Zhong ◽  
Erni Ma ◽  
Jinzhen Cao
Keyword(s):  
Paraffin Wax ◽  
Copper Azole

scholarly journals Effect of Adding (Binder-Plastisizer-Lubricat) on the Physical Properties of Kaolin

2007 ◽  
Vol 4 (3) ◽  
pp. 397-406
Author(s):  
Baghdad Science Journal
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Compaction Pressure ◽  
Paraffin Wax ◽  
The Matrix

The study concern with the preparation of three type of mixtures; which are prepared from different percentage of polyvenil Butyral, Di-n-butyl phathalate and paraffin wax pastillated. The solvent used is Xylolzul analyses. After washing, Drying and milling the kaolin Dukhla, as a matrix in this study, and by using sieving Tech. The range of particle size used is less than and less than as a mesh batch. The added percentage from prepared mixture were 5% and 10% to 95% and 90% of the matrix respectively. Then disk samples were prepared by using a compaction pressure with heating. After cooling and drying the samples were undergo heat treatment in the range of (1250 – 1350) oC. The measurement of shrinkage and Dielectric properties shows that the satisfied data to be compatible with the industrial properties were for 5% (75%B + 15%P + 10%L) added to 5% to 95% of Kaolin (Particle size less than ); which was fired at 1300oC.

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