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  • 1. MOVING TO ENVIRONMENTALLY FRIENDLY WOOD PRESERVATIVES AND COATINGSLAURA REYES, Wood Engineering Department, Engineering Faculty, Universidad del Bìo-BìoFABIOLA ANDANA, Civil Engineering Department, Universidad de ConcepciónGRECIA AVILES, NATALIA JARA, TAMARA GONZALEZ, Building Engineering School, Universidad del Bìo-Bìo Forest Product Society 65th International Convention Portland, Oregon, june 21st
  • 2. OUTLINE-BACKGROUND-PURPOSE-MATERIALS &METHOD-RESULTS & DISCUSSION-CONCLUSIONS
  • 3. BACKGROUND CCAENVIRONMENTAL BORON SILICATE IMPACT Pinus Radiata D. DON WOODIMPREGNATION & COPPERAZOLES SUPERFICIAL PROTECTION WATER SOLVENT COATING
  • 4. MATERIALS & METHOD WOOD SAMPLESImpregnation Retention Penetration Corrosion Lixiviation Surface Accelerated protection weathering Coating selection Checking Varnish-Stain-Dye Chalking Coating application Adhesion Water absorption
  • 5. MATERIALS & METHOD Pilot scale impregnation plant X ray fluorescence ASOMA equipment
  • 6. MATERIALS & METHOD  Coating selection and characterization- Varnish- Stain- Tint -Density -Viscosity -Solid content
  • 7. MATERIALS & METHOD Wood samples Preserved wood selection Coating application
  • 8. MATERIALS & METHOD Accelerated weathering < Ultraviolet chamber Rain simulation >
  • 9. RESULTSWood Impregnation Retention Retention Preservatives Retention NCh 819 CCA 4,0 4,1 1,8 CA-B 1,7 11,2 11,3 BS
  • 10. RESULTS Preservatives Penetration CCA BS( Cromazurol) (curcumin) CA-B (Cromazurol)
  • 11. RESULTSCorrosionPreservative Weight difference Nail type solution (% w/w) Galvanized iron 1,20 CCA Steel 0,05 Cooper 0 Galvanized iron 1,41 CA-B Steel 0,07 Cooper 0 Galvanized iron na BS Steel na Cooper na
  • 12. RESULTS Lixiviation Lixiviate Preservative concentration % (w/w) Fixing time CCA BS CA-B (hour) 24 0,00337 0,00897 0,00764 0,00423 48 0,00149 0,00538
  • 13. RESULTS Pot coating characteristics Properties Density Viscosidty Solid content Coating (g/ml) (s) (%p/p) Varnisn 0,88 190 72,9 Stain 1,02 30 21,6 Dye 0,99 116 11,3
  • 14. RESULTSCoating performance Adhesion 100% 90% Porcentaje de Probetas 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 1 2 3 4 5 Grados de Adherencia CONTROL - BARNIZ CONTROL - STAIN CONTROL - TINTE BS - BARNIZ BS - STAIN BS - TINTE CA-B - BARNIZ CA-B - STAIN CA-B - TINTE CCA - BARNIZ CCA - STAIN CCA - TINTE
  • 15. RESULTS Coating performance Checking varnish stain dye
  • 16. RESULTSTREATMENT COSTS Preservative Costs Retention (kg /m3 ) Total cost Preservative NCh 819 ($U/m3) Boronsilicate (BS) 50 kg. 2,14 Copperazole (CA-B) 17,67 kg. 2,27 CCA 6,67 kg. 1 Coating application costs Yield Total cost Revestimiento (m2/g/applic.) ($U/m2/ applic.)) varnish 0,015 1 stain 0,008 1,98 dye 0,010 2,62
  • 17. RESULTS Treatment costs BASE -Volume; 1 m3 (320 boardS (½” x 4” x 2,4 m.) •Total surface: 180 m2 Coating Cost ($U /m2/application) Protection VARNISH STAIN DYE Product BS 1,43 1,28 1,22Preservative CA-B 1,49 1,3 1,24Cost (U$/m3) CCA 1 1 1
  • 18. CONCLUSIONS- Boron silicates and copperazole lixiviates concentration are higher than CCA, but has less environmental impact according to thie composition- Stain showed the best performance compared to varnish and dye over copperazole or BS treated wood.
  • 19. CONCLUSIONS- Preservation treatment costs are higher for Copperazole followed by Boronsilicates and cheaper for CCA.- Stain application costs less than traditional varnish, with lower environmental impact.- Combined treatment costs are similar for both Cooperazole and BS treated wood coated with stain.
  • 20. THANK YOU¡¡¡ANY QUESTIONS?
  • 21. ACKNOWLEDGEMENTSCHEMICAL SUPPLYARCHQUIMETAL S.A.PRESERVA S.A.UNIVERSIDAD DEL BÌO-BÌO•ACADEMIC VICE-RECTOR•RESEARCH DEVELOPMENTE AND INNOVATION DIRECTOR•ENGINEERING FACULTY DEAN•WOOD ENGINEERING DEPARTMENT HEAD & TECHNICAL STAFF