Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid

Chemical modification of wood can minimize wood drawbacks in exterior application, such as moisture absorption, swelling and shrinkage, susceptibility to photodegradation and microbial attack. We modified a beech wood with 7.0 % water solution of citric acid and 6.5 % sodium-hypophosphite monohydrat...

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Autores principales:	Josip Miklečić, Vlatka Jirouš-Rajković
Formato:	article
Lenguaje:	EN
Publicado:	University of Zagreb, Faculty of Forestry and Wood Technology 2011
Materias:	chemical modification citric acid QUV weathering wood stain beech wood Forestry SD1-669.5
Acceso en línea:	https://doaj.org/article/3126b6e96ba140b1ba3ee537eb96d5b5
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spelling	oai:doaj.org-article:3126b6e96ba140b1ba3ee537eb96d5b52021-12-02T01:47:59ZAccelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid0012-67721847-1153https://doaj.org/article/3126b6e96ba140b1ba3ee537eb96d5b52011-12-01T00:00:00Zhttp://hrcak.srce.hr/file/111572https://doaj.org/toc/0012-6772https://doaj.org/toc/1847-1153Chemical modification of wood can minimize wood drawbacks in exterior application, such as moisture absorption, swelling and shrinkage, susceptibility to photodegradation and microbial attack. We modified a beech wood with 7.0 % water solution of citric acid and 6.5 % sodium-hypophosphite monohydrate (SHP) as a catalyst and investigated the color stability and weathering performance of coated and uncoated wood under accelerated weathering conditions. The modified and unmodified beech wood samples were coated with transparent water-borne stain and transparent solvent-borne stain, and with reference stain. The accelerated outdoor exposure was conducted in a QUV weathering tester(Q-Panel Company) equipped with UVA-340 florescent lamps for 56 days (1344 hours). The surface of samples was examined for color and gloss changes, adhesion and appearance of flaking, cracking, blistering and chalking. The overall color change (ΔE*) of coated beech wood samples at the end of exposure was smaller in unmodified wood samples. The trend of gloss changes of modified and unmodified wood samples was very similar during the exposure. At the end of exposure unmodified beech wood samples exhibited better weathering performance than modified beech wood samples. In order to achieve the optimal protection of wood modified with citric acid the new type of finishes should be developed.Josip MiklečićVlatka Jirouš-RajkovićUniversity of Zagreb, Faculty of Forestry and Wood Technologyarticlechemical modificationcitric acidQUV weatheringwood stainbeech woodForestrySD1-669.5ENDrvna Industrija, Vol 62, Iss 4, Pp 277-282 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	chemical modification citric acid QUV weathering wood stain beech wood Forestry SD1-669.5
spellingShingle	chemical modification citric acid QUV weathering wood stain beech wood Forestry SD1-669.5 Josip Miklečić Vlatka Jirouš-Rajković Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
description	Chemical modification of wood can minimize wood drawbacks in exterior application, such as moisture absorption, swelling and shrinkage, susceptibility to photodegradation and microbial attack. We modified a beech wood with 7.0 % water solution of citric acid and 6.5 % sodium-hypophosphite monohydrate (SHP) as a catalyst and investigated the color stability and weathering performance of coated and uncoated wood under accelerated weathering conditions. The modified and unmodified beech wood samples were coated with transparent water-borne stain and transparent solvent-borne stain, and with reference stain. The accelerated outdoor exposure was conducted in a QUV weathering tester(Q-Panel Company) equipped with UVA-340 florescent lamps for 56 days (1344 hours). The surface of samples was examined for color and gloss changes, adhesion and appearance of flaking, cracking, blistering and chalking. The overall color change (ΔE*) of coated beech wood samples at the end of exposure was smaller in unmodified wood samples. The trend of gloss changes of modified and unmodified wood samples was very similar during the exposure. At the end of exposure unmodified beech wood samples exhibited better weathering performance than modified beech wood samples. In order to achieve the optimal protection of wood modified with citric acid the new type of finishes should be developed.
format	article
author	Josip Miklečić Vlatka Jirouš-Rajković
author_facet	Josip Miklečić Vlatka Jirouš-Rajković
author_sort	Josip Miklečić
title	Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
title_short	Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
title_full	Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
title_fullStr	Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
title_full_unstemmed	Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid
title_sort	accelerated weathering of coated and uncoated beech wood modified with citric acid
publisher	University of Zagreb, Faculty of Forestry and Wood Technology
publishDate	2011
url	https://doaj.org/article/3126b6e96ba140b1ba3ee537eb96d5b5
work_keys_str_mv	AT josipmiklecic acceleratedweatheringofcoatedanduncoatedbeechwoodmodifiedwithcitricacid AT vlatkajirousrajkovic acceleratedweatheringofcoatedanduncoatedbeechwoodmodifiedwithcitricacid
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Accelerated Weathering of Coated and Uncoated Beech Wood Modified with Citric Acid

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