April 7, 2020
Stable and homogenous epoxidized linseed oil/carnauba wax emulsions with an average particle size less than 230 nm were used as a modifier to enhance the performance of wood.
In this study, plant extracts, specifically linseed oil and carnauba wax
(both environmentally friendly and water-repellent substances), were examined as a means to improve the performance of natural wood.
Jinyu Chen, YujiaoWang, Jinzhen Cao and Wang Wang
“Improved Water Repellency and Dimensional Stability of Wood via Impregnation with an Epoxidized Linseed Oil and Carnauba Wax Complex Emulsion”
28 February 2020
DO – 10.3390/f11030271
JO – Forests
Epoxidized linseed oil is modified with carnauba wax
Epoxidized linseed oil is a polymer precursor that allows for significant improvements in the performance of wood treatments. The molecule, in fact, is reactive and during reticulation is able to generate covalent bonds with the wooden support. However, surfaces treated with ELO show limited hydrophobicity and a contact angle of less than 90 degrees. This could be because hydroxyl and carbonyl polar groups are generated that increase surface affinity with water. In recent years, therefore, the focus has been on finding ways to improve the aspects of this biopolymer, in order to expand its uses.
A strategy proposed by researchers in the group led by Prof. Wang Wang of the MOE Key Laboratory of Wooden Material Science and Application, forestry University in Beijing (China) is to improve the limiting characteristics of OLE by blending with apolar organic substances in water emulsions at nanoscale dimensions. The apolar organic substance chosen to improve water barrier properties is carnauba wax of natural origin.