Color properties of tannin-treated wood

BioResources Pub Date : 2024-05-07 DOI:10.15376/biores.19.3.4165-4180

Ş. S. Yaşar, A. Yalinkiliç, Mehmet Yaşar

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Abstract

The color-changing effect of tannin, which is a sustainable and environmentally friendly material used in wood preservation, was studied on varnished and un-varnished wood samples. For this purpose, walnut tannin was applied on samples prepared from Scots pine (Pinus sylvestris L.) and walnut (Juglans regia L.) wood in accordance with ISO 3129 (2019) standard with a brush, and then samples were coated with polyurethane varnish and water-based varnish according to ASTM D3023-98 (2017) principles. Color changes were determined according to ASTM D2244-21 (2021). The obtained data indicated that the highest value in the red color tone (a*) was observed in Scots pine+tannin+polyurethane varnish (PU) (14.4) and the lowest was in Scots pine+control+unvarnished (Uvr) (6.5). The highest value for the yellow color tone (b*) was observed in Scots pine+tannin+PU (34.1), the lowest was in walnut+control+Uvr (14.4), and the highest color lightness value (L*) was obtained in Scots pine+control+Uvr (77.0), and the lowest was obtained in walnut+tannin+PU (18.9). The tannin application, which darkened the wood surface, increased the a* and b* values in both wood types while decreasing the color lightness values 60% to 70%. Tannin application caused a noticeable decrease in total color changes in Scots pine.

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单宁酸处理过的木材的颜色特性

单宁是一种用于木材防腐的可持续环保材料，我们研究了单宁对上过清漆和未上清漆木材样品的变色效果。为此，根据 ISO 3129（2019）标准，用毛刷将核桃单宁涂抹在苏格兰松木（Pinus sylvestris L.）和核桃木（Juglans regia L.）木材制备的样品上，然后根据 ASTM D3023-98 (2017) 原则将样品涂上聚氨酯清漆和水性清漆。颜色变化根据 ASTM D2244-21（2021 年）进行测定。所得数据表明，苏格兰松木+单宁+聚氨酯清漆（PU）的红色色调（a*）值最高（14.4），苏格兰松木+对照组+未清漆（Uvr）的红色色调（a*）值最低（6.5）。苏格兰松木+单宁+PU（34.1）的黄色色调（b*）值最高，核桃木+对照组+Uvr（14.4）的黄色色调（b*）值最低；苏格兰松木+对照组+Uvr（77.0）的颜色亮度值（L*）最高，核桃木+单宁+PU（18.9）的颜色亮度值（L*）最低。单宁的应用使木材表面变黑，增加了两种木材的 a* 和 b* 值，同时降低了 60% 到 70% 的色明度值。单宁的应用使苏格兰松木的总颜色变化明显减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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BioResources

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