The influence of mechanical, physical and chemical pre-treatment processes of wood surface on the relationships of wood with a waterborne opaque coating

The selection of the wood surface pre-treatment process prior to finishing for an optimal wood-coating relationship can be challenging, but has a great significance properties coated products. present study compares beech ( Fagus sylvatica L.) after mechanical (MT), physical (PT) and chemical (CT) treatment shows relationships pre-treated with original (O) diluted (D, 10% water addition) waterborne opaque coatings. Wood was found have most oxidized surfaces (O/C ratio 0.7) pronounced polar character (water contact angle 24°) PT atmospheric plasma discharge, followed by exposed MT 0.6, 52°) CT 0.4, 94°), representing organic solvent. Changes in cell structure reduced roughness S decreased ?2.0%) were observed only CT. best wettability coatings on CT, reaching values advancing angles 94° 89° O coating 71° 75° D coating, respectively. This that it is not condition greatest influence used, play major role. After applying surfaces, thicker (between 60 ?m 41 ?m) films than 47 37 ?m). Despite some differences determined penetration depths, no general statement could made about type pre-treatment. highest adhesion strengths (6.4 MPa 5.4 MPa), (4.6 4.5 MPa) smallest (2.2 2.5 MPa). reasons contradictions between strength due formulation studied, which seems adhere better substrates • hydrophilic achieved treatment. Coatings comparatively good wet treated Properties role wetting surfaces. Highest