Improved performance of poplar wood by an environmentally-friendly process combining surface impregnation of a reactive waterborne acrylic resin and unilateral surface densification

Trends in Chemical Wood Surface Improvements and Modifications: A Review of the Last Five Years

“…While the compression of wood itself is not a subject of this review, the effect of a surface pre-treatment on its durability was deemed appropriate. Wu et al impregnated poplar wood with a reactive waterborne acrylic resin by immerging a quarter of the wood blocks into the resin solution and applying a vacuum, leading to weight percent gains ranging from 1.1% to 4.7% [233]. Afterward, the impregnated surface was densified with a hot press under different temperatures ranging from 150 • C to 180 • C. At the highest loading of resin, the set-recovery of the impregnated wood was only 1.8%, while the control samples reached 73.0%.…”

“…This system, establishing the synergistic effect of SiO 2 and K 2 CO 3 on the limiting oxygen index (LOI) of the treated poplar, allowed for the obtention of a satisfying 30.5% LOI even after leaching. Finally, wood with very high impact resistance was prepared by surface impregnating reactive chemicals prior to one-sided surface densification [232][233][234].…”

Evaluation of the oligomeric epoxy silane as coupling agent on thermal and mechanical properties of water‐based acrylate adhesives

“…Water-based acrylate polyester adhesives (Acrodur ® ) are commercially supplied by BASF, which fulfill the VOCs specifications and are used in the wood sector. [1][2][3][4][5][6][7] This class of adhesive consists of an aqueous solution comprised of polycarboxylic acid/polyalcohol or dispersion of poly (styrene-acrylic) latex with a polycarboxylic acid and a polyalcohol as the crosslinking component (Figure 1) and has been used as a binder for wood fibers; flax-fabric linen [1] ; kenaf [8] ; wood panel [9] ; hemp [10] ; floors, glued laminate beams, and internal automotive components. [11,12] At temperatures above 130 C, the crosslinking structures occur through an esterification reaction between carboxylic and hydroxyl groups, resulting in the formation of water as by-product and making them environment-friendly substitute for traditional thermoset adhesives.…”

“…[11,12] At temperatures above 130 C, the crosslinking structures occur through an esterification reaction between carboxylic and hydroxyl groups, resulting in the formation of water as by-product and making them environment-friendly substitute for traditional thermoset adhesives. [1,2,[6][7][8][9][10][11][12] This class of adhesive offers significant benefits such as easy processing, high environmental compatibility due to its non-corrosive properties, reduction in the moisture swelling of densified wood, high heat resistance, and excellent storage stability. [1,[8][9][10][11][12] Islam and Miao [1] found a combination of high specific tensile strength, high specific Young's modulus, thermal resistance, and water resistance in flax-fabric linen biocomposites produced with Acrodur ® (950 L and DS 3515) in the ratio 3:1 at 160 C and 0% RH.…”

“…[1,2,[6][7][8][9][10][11][12] This class of adhesive offers significant benefits such as easy processing, high environmental compatibility due to its non-corrosive properties, reduction in the moisture swelling of densified wood, high heat resistance, and excellent storage stability. [1,[8][9][10][11][12] Islam and Miao [1] found a combination of high specific tensile strength, high specific Young's modulus, thermal resistance, and water resistance in flax-fabric linen biocomposites produced with Acrodur ® (950 L and DS 3515) in the ratio 3:1 at 160 C and 0% RH. Acrodur ® 950 L was also used by Wu et al [9] to obtain surface-densified poplar wood by combining the impregnation of resin with unilateral surface densification by vacuum at different temperatures.…”