Weathering of silane treated wood

Donath, Steffen; Militz, Holger; Mai, Carsten

doi:10.1007/s00107-006-0131-y

Cited by 56 publications

(28 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The water uptake of PTES and MTES-treated wood was considerably diminished, due to the high water repellence of these two alkoxysilanes. This observation is similar to that of Donath et al (2006Donath et al ( , 2007 who also found MTES to be suitable for aboveground use.…”

Section: Aboveground Testsupporting

confidence: 89%

Durability of Epoxi-Oil Modified and Alkoxysilane Treated Wood in Field Testing

Panov¹,

Terzıev²

2015

BioResources

View full text Add to dashboard Cite

Increased interest in oils and silicones as hydrophobic agents creates the need for testing, with the aim of better understanding their field performance and preparation for an eventual market entrance of these products. This study reveals the aboveground test performance of wood impregnated with epoxidised linseed oil (ELO) and organofunctional alkoxysilanes and compares the achieved results with the significantly more severe inground exposure and initial laboratory tests. Since ELO and siloxanes are not active ingredients, they were combined with fungicides for better performance. Various oil and alkoxysilane retentions and combinations with boric acid, organic fungicides, and creosote were impregnated in wood and tested. Untreated, chromium-copper-arsenate (CCA)-treated and thermally modified samples served as references. Long-term aboveground and inground testing of the studied formulations enforced the conclusion that ELO combined with biocides is suitable protective formulation for timber in both above-and in-ground exposure. Two alkoxysilanes were more effective in timber exposed aboveground. No decay was registered in the ELO and alkoxysilane treated lap-joint samples, while the untreated controls were close to failure after five years of exposure.

show abstract

Section: Aboveground Testsupporting

confidence: 89%

Durability of Epoxi-Oil Modified and Alkoxysilane Treated Wood in Field Testing

Panov¹,

Terzıev²

2015

BioResources

View full text Add to dashboard Cite

show abstract

“…A treatment with siloxanes increased the water repellency of wood (Donath et al 2006(Donath et al , 2007, but did not considerably influence the sorption behaviour of wood. Siloxanes containing amino-functional groups showed protective effectiveness against wood destroying basidiomycetes particularly the brown rot fungi Coniophora puteana and Gloeophyllum trabeum in laboratory durability tests according to EN 113 (Donath 2004).…”

Section: Introductionmentioning

confidence: 85%

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

2011

View full text Add to dashboard Cite

Specimens of Scots pine sapwood (Pinus sylvestris) and beech wood (Fagus sylvatica) were treated with a sodium water glass solution, an amino-alkyl-functional oligomeric siloxane and 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU). The specimens were exposed outside without ground contact for 24 months. Colour measurements during outside exposure showed a discoloration of all wood specimen surfaces. FTIR spectroscopy displayed lignin degradation of all specimens during the initial exposure time. Chemical treatments decelerated fungal infestation of wood, while their effect on lignin degradation was not discernible. SEM studies revealed that fungal infestation was affected by the different treatments. The untreated specimens showed radial penetration of fungal hyphae through the pits. Only superficial infestation and no radial penetration were visible at water glass and siloxane treated specimens. A significantly reduced radial penetration of fungal hyphae was exhibited at DMDHEU treated specimens. Fungal infestation through the pits was not visible. Bewitterungseigenschaften von Wasserglas, Siloxan, DMDHEU behandeltem HolzZusammenfassung Prüfkörper aus Kiefer (Pinus sylvestris) und Buche (Fagus sylvatica) wurden mit einem Natriumwasserglas, einem Amino-Alkyl-funktionellem oligomeren Silansystem, und 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) behandelt. Unbehandelte und behandelte Prüfkörper wurden für die Dauer von 24 Monaten einer Freilandbewitterung ohne Bodenkontakt ausgesetzt. Ei-A. Pfeffer ( ) ·

show abstract

“…Deposition of hydrophobing agents in the lumens can therefore reduce the uptake of liquid water, but cannot lower the moisture sorption by the cell wall and, thus, the EMC (Donath et al 2007). This was also observed for the two NMM compounds, particularly for mNMM-2.…”

Section: Equilibrium Moisture Contentmentioning

confidence: 99%

Modification of beech veneers with N-methylol-melamine compounds for the production of plywood

2011

View full text Add to dashboard Cite

Rotary cut beech (Fagus sylvatica L.) veneers were treated with two formulations based on N -methylolmelamine (NMM): (1) NMM solution (NMM-1, 10% solid content), (2) fatty acid modified NMM dispersions containing paraffin (with an aluminium salt as catalyst, mNMM-2, 5% solid content). Five treated veneers were bonded with phenol formaldehyde (PF) adhesive to produce plywood in two different processes.The plywood treated with NMM-1 displayed increased shear strength in comparison to the controls, whereas the treatments with mNMM-2 diminished the shear strength of the plywood to different extents. Treatment with NMM-1 also enhanced other mechanical properties of the plywood as compared to water-treated control plywood such as Brinell hardness, modulus of elasticity and bending strength. The plywood treated with mNMM-2 showed only slight changes of these mechanical properties compared to the control plywood.The plywood specimens were subjected to cyclic water submersion and oven-drying. The treatment with mNMM-2 caused greater reduction in water uptake and thickness swelling than NMM-1; the degree of delamination depended on the process. The plywood treated with NMM-1 exhibited lower equilibrium moisture content than that treated with mNMM-2. The formaldehyde emission of NMM-1-treated plywood was much higher than that of the control and the mNMM-2-treated plywood. Das mit NMM-1 behandelte Sperrholz wies im Vergleich zu den Kontrollen eine erhöhte Scherfestigkeit auf, wäh-rend die Behandlung mit mNMM-2 die Scherfestigkeit des Sperrholzes in unterschiedlichem Ausmaß reduzierte. Die Behandlung mit NMM-1 erhöhte außerdem andere mechanische Eigenschaften wie die Brinellhärte, den Elastizitäts-modul und die Biegefestigkeit. Das mit mNMM-2 behandelte Sperrholz zeigte im Vergleich zum Kontrollsperrholz nur leichte Veränderungen der genannten mechanischen Eigenschaften.Die Sperrholzproben wurden einem zyklischen Test bestehend aus Tauchen in Wasser und Ofentrocknung unterzogen. Die Behandlung mit mNMM-2 verursachte eine stärke-re Abnahme der Wasseraufnahme und der Dickenquellung als NMM-1; der Grad der Delaminierung war dabei vom Prozess abhängig. Das mit NMM-1 behandelte Sperrholz zeigte eine niedrigere Gleichgewichtsfeuchte als das mit mNMM-2 behandelte. Die Formaldehydabgabe von NMM-1-behandeltem Sperrholz war sehr viel höher als die der Kontrolle und des mNMM-2-behandelten Sperrholzes. Eur.

show abstract

Weathering of silane treated wood

Cited by 56 publications

References 12 publications

Durability of Epoxi-Oil Modified and Alkoxysilane Treated Wood in Field Testing

Durability of Epoxi-Oil Modified and Alkoxysilane Treated Wood in Field Testing

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

Modification of beech veneers with N-methylol-melamine compounds for the production of plywood

Contact Info

Product

Resources

About