Effects of impregnation with imersol‐AQUA on yellow color tone of some softwoods and varnishes

Abstract

This study has been performed for determining impacts of impregnation with Imersol-AQUA (I-AQUA) to yellow color tone of some softwoods and varnishes. For this purpose, samples of scotch pine (Pinus sylvestris L.), oriental spruce (Picea orientalis L.), and Uludag fir (Abies bornmlleriana L.) wood, prepared according to the ASTM D 358 standards, are impregnated with I-AQUA by short-term (S), medium-term (M), and long-term (L) immersion techniques in accordance with ASTM D 1413 and producer's definition. After impregnation, surfaces have been coated by synthetic (Sv), acrylic (Ac), water-based varnishes (Wb) and polyurethane (Pu) varnishes in accordance with ASTM D 3023 standards. According to ASTM D 2244 standards, yellow color tone value of specimens after varnishing process was determined. As a result, based on the wood material, varnish type, and impregnation period, yellow color tone was the highest in pine, medium-term dipping, and synthetic varnish and the lowest in fir, long-term dipping, and water-borne varnish. Considering the interaction of wood type, period of impregnation and type of varnish, yellow color tone was the highest in fir þ medium-term of dipping þ synthetic varnish and the lowest in spruce þ long-term of dipping þ water-borne varnish. So, impregnation process, impregnation period, and varnishes applied during tests showed increasing impact for yellow color tone value of wood materials.

The Effects of Natural Weathering on Color Stability of Impregnated and Varnished Wood Materials

“…However, the impregnation materials decreased the red color tone value in wood materials [38]. It is reported that the impregnation of some softwoods with some chemicals has increased the yellow color tone [39]. Baysal et al also reported that three color parameters ( * , * , and * ) of Scots pine decreased after the AD-KD5 impregnation process [40].…”

Impacts of impregnation with Timbercare Aqua on the red and yellow color tone of some woods and varnishes

“…Thus, the yellow color value is declared to be high in Scotch pine wood. 5 For samples varnished after impregnation, yellow tone value was the highest in Oriental spruce 1 Tc 1 Sp and the lowest in Oriental beech 1 Tc 1 Si after impregnation with Tc.…”

“…In a similar research, it was reported that Imersol Aqua treatment caused to an increase of the yellow color tone of some softwood types. 5 …”

“…It was measured more than control samples 42% in short-term, 46% in medium-term, and 36% in longterm dipping method. 5 It was assessed that the impregnation of hardwoods with Imersol-Aqua increased the red color tone that found the highest in Oriental beech, synthetic varnish, and short-term dipping method and the lowest in European oak, water-borne varnish, and long-term dipping method. Red color tone was found 29% higher in beech than oak.…”

The effects of steaming of beech (Fagus orientalis L.) and sapele (Entandrophragma cylindricum) woods on the adhesion strength of varnish

“…[15][16][17] Furthermore, the effects of impregnated substances on the brightness, color, hardness and burning of the varnish types have been investigated in many recent studies. [18][19][20][21][22] Sapele (Entandrophragma cylindricum) is a native species of Africa with a distribution ranging from the Ivory Coast to Cameroon and through Zaire to Uganda. Its heartwood is medium to fairly dark reddish brown or purple brown and its sapwood is pale yellow.…”