Artificial Weathering in <i>Tectona grandis</i> Slides Treated with Finishing Products

Queiroz, Francis Lívio Corrêa; Gonçalez, Joaquim Carlos; del Menezzi, Cláudio Henrique; Ribeiro, Edilene Silva; Lima, Clarissa Melo

doi:10.1590/2179-8087.126315

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Artigos Originais • Floresta Ambient. 23 (4) • Oct-Dec 2016 • https://doi.org/10.1590/2179-8087.126315 copy

Artificial Weathering in Tectona grandis Slides Treated with Finishing Products

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aims to evaluate the effects of weather exposure to artificial weathering in the color of teak wood veneer treated with finishing products. The samples received 2 types of products, the sealer and the stain, plus witnesses, unfinished. The experiment was conducted in a completely randomized design with 3 treatments and 4 replications. Slides were exposed to QUV-Accelerated Weathering Test simulator for 7 periods as follow: 6, 12, 24, 48, 96, 192 and 384 hours. Color measurements were made after each period of weathering using the spectrophotometer Color Eye XTH. The chromatic variables evaluated were: L *, a *, b *, C * and h*. The study concluded that the teak wood veneer had color alterations with the exposure time and the stain was more efficient in preserving the wood color.

Keywords:
teak; photobleaching; colorimetry; sealer; stain

VARIAÇÃO TOTAL DA COR (∆E)	CLASSIFICAÇÃO
0,0-0,5	Desprezível
0,5-1,5	Ligeiramente perceptível
1,5-3,0	Notável
3,0-6,0	Apreciável
6,0-12,0	Muito apreciável

Tratamento	Período	Parâmetros colorimétricos					Cor
Tratamento	(h)	L*	a*	b*	C	h*	Cor
Testemunhas	0¹	51,22a	11,14c	25,87b	28,17b	65,88a	Marrom-oliva
Seladora	0¹	52,64b	11,64a	26,89a	29,31a	66,62a	Marrom-oliva
Stain	0¹	53,59a	11,47a	26,42b	28,80b	66,51a	Marrom-oliva
Testemunhas	6	53,35a	10,89c	28,51a	30,52a	69,08a	Amarelo amarronzado
Seladora	6	43,37b	14,36b	26,06b	29,76b	61,11b	Amarelo amarronzado
Stain	6	41,81c	15,80a	25,22c	29,77b	57,82c	Amarelo amarronzado
Testemunhas	12	43,10a	13,85b	28,49a	31,70a	64,00a	Amarelo amarronzado
Seladora	12	42,26a	13,34b	21,13b	25,02c	57,47b	Marrom avermelhado
Stain	12	38,77b	14,43a	22,10b	26,41b	56,52c	Marrom avermelhado
Testemunhas	24	-	14,96b	24,77a	28,98a	58,55a	Marrom avermelhado
Seladora	24	40,52a	15,49a	23,32b	28,01a	56,34c	Marrom avermelhado
Stain	24	40,84a	15,36a	24,26ab	28,72a	57,51b	Marrom avermelhado
Testemunhas	48	50,64a	13,46c	30,60a	33,43a	66,25a	Marrom-oliva
Seladora	48	40,02c	16,68a	24,31b	29,49b	55,51c	Marrom avermelhado
Stain	48	40,94b	15,15b	24,05b	28,45c	57,56b	Marrom avermelhado
Testemunhas	96	51,70a	12,57c	28,95a	31,57a	66,51a	Marrom-oliva
Seladora	96	40,39c	17,18a	25,03c	30,37b	55,45c	Amarelo amarronzado
Stain	96	43,16b	15,46b	25,99b	30,26b	59,07b	Amarelo amarronzado
Testemunhas	192	56,91a	10,57c	25,82b	27,91c	67,75a	Amarelo amarronzado
Seladora	192	43,54c	17,71a	28,02a	33,19a	57,57c	Amarelo amarronzado
Stain	192	44,86b	14,72b	26,30b	30,16b	60,66b	Amarelo amarronzado
Testemunhas	384	60,09a	08,50c	21,57c	23,19c	68,53a	Oliva amarelado
Seladora	384	53,57b	13,93a	29,93a	33,05a	65,14b	Amarelo amarronzado
Stain	384	48,55c	12,75b	27,95b	30,75b	65,39b	Marrom-oliva

Tratamento	Período	Tempo de exposição (h)	Variação dos parâmetros colorimétricos				Classificação
Tratamento	(h)	Tempo de exposição (h)	ΔL*	Δa*	Δb*	ΔE	ΔE
Testemunhas	0¹	0¹	–0,71	–0,13	–0,34	0,80	LP
	6	6	–1,42	0,38	–2,3	2,73	N
	12	12	10,25	–2,96	0,02	10,67	MA
	24	36	9,09	–1,11	3,72	9,88	MA
	48	84	–16,63	1,5	–5,83	17,69	MA
	96	180	–1,06	0,89	1,65	2,15	N
	192	372	–5,21	2	3,13	6,40	MA
	384	756	–3,18	2,07	4,25	5,70	A
Seladora	0¹	0¹	–6,3	2,28	0,53	6,72	MA
	6	6	9,27	–2,72	0,83	9,70	MA
	12	12	1,11	1,02	4,93	5,15	A
	24	36	1,74	–2,15	–2,19	3,53	A
	48	84	0,5	–1,19	–0,99	1,63	N
	96	180	–0,37	–0,5	–0,72	0,95	LP
	192	372	–3,15	–0,53	–2,99	4,37	A
	384	756	–10,03	3,78	–1,91	10,89	N
Stain	0¹	0¹	–10,87	4,77	0,22	11,87	MA
	6	6	11,78	–4,33	1,2	12,61	MA
	12	12	3,04	1,37	3,12	4,57	A
	24	36	–2,07	–0,93	–2,16	3,13	A
	48	84	–0,1	0,21	0,21	0,31	D
	96	180	–2,22	–0,31	–1,94	2,96	N
	192	372	–1,7	0,74	–0,31	1,88	N
	384	756	–3,69	1,97	–1,65	4,50	A

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[1] Francis Lívio Corrêa Queiroz Departamento de Engenharia Florestal, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Via L3 Norte, s/n, Asa Norte, CP 04.357, CEP 70910-900, Brasília, DF, Brasil e-mail: francislcq@hotmail.com