Investigating the surface performance of impregnated and varnished Calabrian pine wood against weathering

Türkoğlu, Türkay; Baysal, Ergün; Altay, Çağlar; Toker, Hilmi; Küçüktüvek, Mustafa; Gündüz, Ahmet

doi:10.1590/0104-1428.10120

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ORIGINAL ARTICLE • Polímeros 30 (4) • 2020 • https://doi.org/10.1590/0104-1428.10120 copy

Investigating the surface performance of impregnated and varnished Calabrian pine wood against weathering

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The study investigates the gloss and color changes values of Calabrian pine (Pinus brutia Ten.) wood impregnated with some copper content impregnation chemicals such as Celcure C4, Korasit KS, and Tanalith E 8000 and then water-based varnish (WBV) and polyurethane varnish (PV) coated after 6 months of weathering. The results of study showed that gloss values of PV coated Calabrian pine wood were higher than that of WBV coated Calabrian pine wood before weathering. The gloss values of all treatment groups decreased after weathering. Lightness values of Calabrian pine wood also decreased for all treatment groups after weathering. Pre-impregnation before PV coating resulted in lower 𝜟L* values of Calabrian pine wood. While all treatment groups tended to turn reddish by giving 𝜟a* positive values, they tended to turn bluish by giving negative 𝜟b* values. The lowest total color change was obtained with only WBV coated Calabrian pine wood.

Keywords:
impregnation; weathering; varnish; color and gloss test; Calabrian pine wood

Months	May	June	July	August	September	October
Average temperature per month (°C)	18.4	23.4	26.1	27.8	22.6	18.0
Humidity per month (%)	54.4	55.4	42.7	40.0	53.3	65.1
Average wind speed per month (m/sn)	1.3	1.4	1.8	1.7	1.4	0.9
Total rainfall per month (mm=kg/m^-2)	9. 0	76.5	43.2	16.4	51.4	78.6
Number of rainy days	5	12	1	1	5	5

Impregnation + Varnish	Concentration (%)	Retention (Kg/m³)	Before natural weathering		After 6 months of natural weathering		Gloss losses (%)
			gloss values		gloss values		Gloss losses (%)
			Mean	SD	Mean	SD	Mean	HG
PV	-	-	99.52	9.72	55.32	5.95	-44.41	C
WBV	-	-	46.26	6.50	24.15	3.25	-47.79	DE
Celcure C4+PV	2.5	13.48	97.60	11.19	57.24	6.10	-41.35	B
Celcure C4+PV	5.0	30.92	98.36	10.06	43.30	9.58	-55.97	G
Korasit KS+ PV	2.5	14.88	97.93	9.76	56.25	7.03	-42.56	B
Korasit KS+ PV	5.0	32.11	98.66	8.87	50.90	8.55	-48.40	E
Tanalith E 8000 +PV	2.5	15.05	93.12	12.49	54.57	6.45	-41.39	B
Tanalith E 8000 +PV	5.0	31.47	96.36	13.11	51.66	7.48	-46.38	D
Celcure C4+ WBV	2.5	13.48	50.43	6.89	19.79	5.69	-60.75	H
Celcure C4+ WBV	5.0	30.92	54.68	8.05	33.94	5.04	-37.92	A
Korasit KS+ WBV	2.5	14.88	52.90	12.61	24.62	5.84	-53.45	F
Korasit KS+ WBV	5.0	32.11	44.56	6.39	22.90	5.69	-48.60	E
Tanalith E 8000 + WBV	2.5	15.05	52.62	7.90	22.46	4.26	-57.31	G
Tanalith E 8000 + WBV	5.0	31.47	52.62	5.72	32.15	5.89	-38.91	A

Impregnation + Varnish	Conc. (%)	Color values before natural weathering			Color change values after natural weathering			𝜟L*		𝜟a*		𝜟b*		Total color change values after natural weathering
		Color values before natural weathering			Color change values after natural weathering			𝜟L*		𝜟a*		𝜟b*		𝜟E*
		Li*	ai*	bi*	Lf*	af*	bf*	*Mean*	HG	*Mean*	HG	*Mean*	HG	*Mean*	HG
PV	-	67.92	6.32	41.51	60.17	14.18	37.10	-7.75	G	7.86	ABC	-4.41	A	11.88	DE
WBV	-	70.89	4.79	33.03	66.00	11.01	30.84	-4.89	DE	6.22	DE	-2.19	A	8.20	G
Celcure C4+PV	2.5	49.78	4.15	42.29	44.36	12.15	23.51	-5.42	E	8.00	ABC	-18.78	EF	21.12	AB
Celcure C4+PV	5.0	44.47	1.24	30.34	40.79	8.45	25.83	-3.68	C	7.21	BCD	-4.51	A	9.26	G
Korasit KS+ PV	2.5	50.36	3.82	40.50	43.71	12.32	23.17	-6.65	F	8.50	AB	-17.33	E	20.41	B
Korasit KS+ PV	5.0	46.90	2.09	33.53	43.36	8.55	23.59	-3.54	C	6.46	DE	-9.94	C	12.37	DE
Tanalith E 8000 +PV	2.5	50.46	3.04	39.34	50.17	11.95	29.22	-0.29	A	8.91	A	-10.12	C	13.48	D
Tanalith E 8000 +PV	5.0	43.13	3.07	37.93	42.67	9.49	16.51	-0.46	A	6.42	DE	-21.42	G	22.36	A
Celcure C4+ WBV	2.5	49.57	2.07	33.74	49.32	10.24	26.27	-0.25	A	8.17	ABC	-7.47	B	11.07	EF
Celcure C4+ WBV	5.0	44.01	2.00	31.34	39.64	9.04	17.17	-4.37	CD	7.04	CD	-14.17	D	16.41	C
Korasit KS+ WBV	2.5	56.12	3.59	39.60	46.75	9.46	19.80	-9.37	H	5.87	DE	-19.80	FG	22.67	A
Korasit KS+ WBV	5.0	49.99	2.18	33.07	48.40	9.44	24.41	-1.59	B	7.26	BCD	-8.66	BC	11.41	EF
Tanalith E 8000 + WBV	2.5	51.01	3.30	38.80	44.21	8.86	17.86	-6.80	F	5.56	E	-20.94	FG	22.70	A
Tanalith E 8000 + WBV	5.0	52.35	0.87	30.56	48.53	8.97	26.63	-3.82	C	8.10	ABC	-3.93	A	9.77	FG

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[1] * turkayturkoglu@mu.edu.tr