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Rubberwood preservation by friendly preservatives

Rubberwood preservation by friendly preservatives. Mingliang Jiang, Zhijun Wang Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China Dec 8-10, 2008 Haikou, China. Contents. Brief introduction of wood and rubberwood preservation

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Rubberwood preservation by friendly preservatives

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  1. Rubberwood preservation by friendly preservatives Mingliang Jiang, Zhijun Wang Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China Dec 8-10, 2008 Haikou, China

  2. Contents • Brief introduction of wood and rubberwood preservation • Treatment specification and quality control • Laboratory test of Antistain and Antimold Formulations on rebberwood (ITTO 1996-1998) • Laboratory test of Antistain and Antimold Formulations (2003-2007) • Technical report of vacuum pressure treatment by NaPCP free preservative during 2006-2007

  3. 1 Brief introduction of wood and rubberwood (RW) preservation

  4. Wood preservation in China • Railway sleeper by creosote • Exterior uses treated by CCA/ACQ/CuAz • Indoor uses of rubberwood by boron

  5. ACQ treated Chinese fir for exterior use, Anhui, 2006

  6. RW Preservation in China • Began on 1970’s • Today mainly by vacuum/pressure process

  7. Sawing of rubberwood

  8. The rubberwood treated

  9. Some facts on RW preservation: • The rubberwood timber production in China is about 0.4 millionM3 /a in the recent years • 100 rubberwood treating plants in China • The RW timber mainly used for furniture making • RW primary products: timber, particleboard, plywood

  10. 2 Treatment specification and quality control

  11. Specification for the treated wood:LY/T1636-2005 • Specification for the treated rubberwood: • No specific standard currently • Usually adopt 0.4 % BAE (Malaysia for wood) • Ref: LY/T1636-2005(wood for C1: 2.8kg/m3 B2O3)

  12. Penetration check

  13. Solution for checking boron

  14. Drying rubberwood, Red-Present of boron; • Yellow- without boron

  15. No spraying • Fresh treated rubberwood spraying with reagent solution

  16. Retention determination

  17. By chemical analysis of boron:Titration,ICP etc • Retention calculation by treating record

  18. Treating record for each charge at Lezhong Wood Factory, Hainan

  19. 3 Laboratory test of Antistain and Antimold Formulations (1996-1998) • 3.1 Experimental methods

  20. Rubberwood sample size: 50×20×1 mm, maple 40×20×3 mm. • Fungicidal formulations for stain control: F1, F2: chlorothalonil/carbendizam fungicides.

  21. Ranking Standard • 1 - Clean: stain or mold covering less than 5% upper surface. • 2 - Light stain: stain or mold covering 5 -20% upper surface. • 3 - Moderate stain: stain or mold covering 20-40 % upper surface. • 4 - Heavy stain: stain or mold covering more than 40% upper surface.

  22. 3.2 Results

  23. Table 1. Comparison of the effectiveness of anti-sapstain treatments against Botryodiplodia theobromae Pat. on rubberwood

  24. Conclusion for 3 • The formulations containing 0.05-0.2% F2, mixed with 0.5%F1 or 0.40%F2 alone are effectiveness for controlling Botryodiplodia theobromae in lab test.

  25. 4 Laboratory test of Antistain and Antimold Formulations (2003-2007) • 4.1 Experimental methods

  26. 4.1.1 Fungal species and their characteristic • Five fungal species were identified as： • Bt: Botryodiplodia theobromae Pat., • Fv: Fusarium verticillioides(Sacc.)Nirenberg, • Th: Trichoderma harzianum Rifai, • Tv: Trichoderma viride Pers., • Pp: Penicillium purpurogenum Stoll.

  27. 4.1.2 Fungicides for the test

  28. Table 2: Fungicidal formulations for the stain control test

  29. 4.1.3 Method for stain control

  30. 4.2 Results

  31. Table 3: Result of the stain control test

  32. Contd

  33. Contd

  34. Contd

  35. Conclusion for 4 • Some formulations containing CBZ, Benomyl, Cu-8 have excellent effectiveness for the controlling of Botryodiplodia theobromae Pat.

  36. 5 Technical report of vacuum pressure treatment by NaPCP free preservative during 2006-2007

  37. 5.1 Materials and method • 5.1.1 Materials • Fresh rubberwood timber.

  38. 5.1.2 Preservatives

  39. 5.1.3 Test sites and treating procedure • Vacuum pressure treatment was used in the following procedure.

  40. Site 1：Lezhong Wood Factory, Hainan Nongken Wood Co，duration：Aug 3, 2006– May 31, 2007.

  41. Site 1: Schedule for the rubberwood Vacuum / Pressure treatment

  42. Fungicide F2 for stain control made in Jiangsu, China

  43. Tank for preparation of treating solution at Lezhong wood plant

  44. Control panal

  45. Site 2： Cangjiang Wood Plant, Xishuangbanna, Yunnan Province. duration：July 24, 2006– Oct 31, 2006.

  46. Site2: Schedule for the rubberwood Vacuum / Pressure treatment

  47. Tank for preparation of treating solution in Cangjiang wood plant, Yunnan

  48. RW timber before treatment

  49. Air drying after treatment prior to kiln

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