Effects of zinc chloride–silicone oil treatment on wood dimensional stability, chemical components, thermal decomposition and its mechanism

Abstract

The hygroexpansion and anisotropy of wood limit its application in construction and wood products industry. Zinc chloride–silicone oil was use to decrease the hygroscopicity and improve the dimensional stability of wood at 80 °C, 140 °C, 160 °C and 180 °C. The effects of the treatment on the dimensional stability, chemical structure, thermal degradation, morphology of wood were evaluated, and the mechanism was determined. Results indicated that the zinc chloride–silicone oil treatment at 80 °C improved the dimensional stability and decreased the hygroscopicity of wood. The tangential, radial, and volumetric swelling coefficients of the treated wood decreased by 9.7%, 33.5%, and 18.2%, respectively, relative to those of the untreated wood. Zinc chloride–silicone oil treatment also changed the chemical structure of wood by degrading the wood components and decreasing the moisture absorption groups. Moreover, zinc chloride–silicone oil treatment significantly influenced the thermal degradation of wood, as samples treated with zinc chloride–silicone oil at 140 °C, 160 °C and 180 °C presented sharp peaks around 511 °C, 501 °C and 473 °C. The control group exhibited a more common derivative thermogravimetric curve with a sharp peak at 375 °C. In addition, the silicone oil could impregnate wood, occlude moisture passage, and prevent the movement of moisture in wood. This method can be applied in building and wood industries to expand the applications of wood products.

Efeito da modificação térmica nas propriedades físicas da madeira de Pinus caribaea var. hondurensis Barrett & Golfari

“…Os fenômenos de inchamento e contração que ocorrem na madeira devido a entrada e saída de água de adesão podem causar defeitos nas peças, como rachaduras e fendilhamentos. Neste sentido, reduzir a instabilidade dimensional da madeira por meio de tratamentos térmicos, como no presente estudo, melhora a sua qualidade para determinados setores, como construção civil, movelaria, decoração entre outros (He et al, 2019).…”

Densidade Básica E Estabilidade Dimensional De Madeiras Tropicais Modificadas Por Tratamentos Térmicos

“…As expansões e contrações devido á entrada e saída de água de adesão, podem causar defeitos como rachaduras, biodeterioração e transformações da superfície, diminuindo o tempo de vida da peça de madeira. Portanto, reduzir a instabilidade dimensional por meio de tratamentos térmicos melhora a qualidade da madeira para construção civil, movelaria, decoração e outras aplicações (HE et al, 2019).…”

Use of Eucalyptus grandis clones treated with a water repellent to improve the dimensional stability of utility poles

“…There is always a certain dimensional stability loss after weathering, but the control specimens (neither selected clones nor treated with the WR) show significantly higher values. It should be noted the main advantage of the WR is that it can be applied in a single stage mixed with the preservative, since it does not require other inputs such as solvents (Can and Sivrikaya 2016) or temperature (as in the application of zinc chloride-silicone oil) (He et al 2019).…”