Comparative evaluation of different thermally modified wood samples finishing with UV-curable and waterborne coatings

被引：37
作者：
Herrera, Rene [1 ]
Muszynska, Monika [2 ]
Krystofiak, Tomasz [2 ]
Labidi, Jalel [1 ]
机构：
[1] Univ Basque Country UPV EHU, Chem & Environm Engn Dept, San Sebastian 20018, Spain
[2] Poznan Univ Life Sci, Dept Wood Based Mat, Div Gluing & Finishing Wood, PL-60627 Poznan, Poland
来源：
APPLIED SURFACE SCIENCE | 2015年 / 357卷
关键词：
Thermally modified wood; Surface finishing processes; Coating performance; Wood surface properties; HEAT-TREATMENT; SURFACE; PERFORMANCE; WETTABILITY; DURABILITY; RESISTANCE; ADHESION; HARDWOOD;
D O I：
10.1016/j.apsusc.2015.09.259
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Thermally modified wood has been developed as an industrial method to improve durability and dimensional stability of wood and thus extends the range of uses and service life of wood-based products. Despite the improvements gained by treatment, surface finishing using coatings prevents esthetical changes such as color degradation or occasional growth of mold adding protection in outdoor use and extending the service life of products. The wood finishing process was carried out with commercially available waterborne and UV-curable coatings on industrially modified at 192, 200, 212 degrees C and unmodified European ash (Fraxinus excelsior L.) wood, using an industrial rollers system and a laboratory brushing system. Changes caused by thermal treatment which could affect the surface finish were measured and compared with control samples, such as water uptake, wettability and acidity. Following the wood finishing, surface properties and esthetic changes were evaluated; as well as the coatings performance. Thermally modified wood presented improved adherence compared with unmodified wood with a significant improvement in samples modified at 212 degrees C, which also present the highest hardness when UV-cured. Finishes with UV-curing maintain the hydrophobic effect of thermally modified wood, whereas waterborne finishes increase the surface wettability. Thermal modification did not negatively influence on the elastic properties of the coated substrate and thus allows this material to be finished with different coating systems in the same conditions as unmodified wood. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：1444 / 1453
页数：10
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