RESEARCH INSTITUTE OF WOOD INDUSTRY (CRIWI), CHINESE ACADEMY OF FORESTRY (CAF) 1 Rubberwood preservation by friendly preservatives Mingliang Jiang, Zhijun

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RESEARCH INSTITUTE OF WOOD INDUSTRY (CRIWI), CHINESE ACADEMY OF FORESTRY (CAF)

Rubberwood preservation by friendly preservatives

Mingliang Jiang, Zhijun WangResearch Institute of Wood Industry, Chinese

Academy of Forestry, Beijing 100091, China

Dec 8-10, 2008 Haikou, China

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Contents1. Brief introduction of wood and rubberwood pre

servation

2. Treatment specification and quality control

3. Laboratory test of Antistain and Antimold Formulations on rebberwood (ITTO 1996-1998)

4. Laboratory test of Antistain and Antimold Formulations (2003-2007)

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

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1 Brief introduction of wood and rubberwood (RW) preservation

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Wood preservation in China

Railway sleeper by creosote Exterior uses treated by CCA/ACQ/CuAz Indoor uses of rubberwood by boron

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ACQ treated Chinese fir for exterior use, Anhui, 2006

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RW Preservation in China Began on 1970’s Today mainly by vacuum/pressure

process

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Sawing of rubberwood

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The rubberwood treated

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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

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2 Treatment specification and quality control

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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)

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Penetration check

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Solution for checking boron

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Drying rubberwood, Red-Present of boron; Yellow- without boron

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No spraying

Fresh treated rubberwood spraying with reagent solution

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Retention determination

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By chemical analysis of boron:Titration,ICP etc

Retention calculation by treating record

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Treating record for each charge at Lezhong Wood Factory, Hainan

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3 Laboratory test of Antistain and Antimold Formulations (1996-1998)

3.1 Experimental methods

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Rubberwood sample size: 50×20×1 mm, maple 40×20×3 mm.

Fungicidal formulations for stain control: F1, F2: chlorothalonil/carbendizam fungicides.

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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.

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3.2 Results

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Table 1. Comparison of the effectiveness of anti-sapstain treat

ments against Botryodiplodia theobromae Pat. on rubberwood Anti-sapstain Treatment Average Std

Untreated Control 4.0 0.0

0.25%NaPCP 4.0 0.0

0.5%NaPCP 3.0 0.0

1%NaPCP 3.0 0.0

1.0%F1（ F） 3.0 0.0

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0.20%F2 2.0 0.0

0.40%F2 1.0 0.0

0.5%F1（ E） +0.10%F2 1.0 0.0

0.5%F1（ E） +0.20%F2 1.0 0.0

0.5%F1（ F） +0.05%F2 1.0 0.0

0.5%F1（ F） +0.10%F2 1.0 0.0

0.5%F1（ F） +0.20%F2 1.0 0.0

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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.

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4 Laboratory test of Antistain and Antimold Formulations (2003-2007)

4.1 Experimental methods

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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.

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4.1.2 Fungicides for the test

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Table 2: Fungicidal formulations for the stain control test

Formulations Common nameFormulation

types

CTL Chlorothalonil Emulsion

CBZ Carbendazim50% wetable powe

r

Benomyl Benomyl50% wetable powe

r

BACDodecyl dimethyl benzyl amm

onium chlorideWater solution

Cu-8 Copper oxineAcetic acid

solution

DDACDidecyl dimethyl ammonium c

hlorideWater solution

PPZ Propiconazole Emulsion

TEB Tebuconazole Emulsion

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4.1.3 Method for stain control

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4.2 Results

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Table 3: Result of the stain control test

FormulationsConcentrations of a. i. B t

CBZ

0.001% 36.6

0.005% 39.2

0.010% 40.1

0.02% 40.6

0.10% 41.2

0.20% 43.6

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FormulationsConcentrationsof a. i. B t

benomyl

0.001% 32.4

0.005% 35.5

0.010% 37.0

0.02% 38.1

0.10% 40.7

0.20% 50.6

Contd

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Contd

Formulations Concentrationsof a. i. B t

CBZ+Cu-8

0.01%+0.01% 21.4

0.01%+0.05% 22.3

0.01%+0.1% 23.8

0.1%+0.2% 42.3

0.1%+0.5% 47.2

0.2%+0.5% 59.7

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Contd

Formulations Concentrationsof a. i. B t

Benomyl+Cu-8

0.005%+0.01% 42.7

0.01%+0.01% 43.1

0.02%+0.01% 46.1

0.02%+0.02% 48.9

0.1%+0.02% 50.4

0.2%+0.08% 52.9

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Conclusion for 4

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

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

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5.1 Materials and method

5.1.1 Materials Fresh rubberwood timber.

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Formulations

Boric acid Borax F2

Site 1 0.50 1.000.035-

0.045

Site 2 1.00 0.200.035-

0.050

5.1.2 Preservatives

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5.1.3 Test sites and treating procedure

Vacuum pressure treatment was used in the

following procedure.

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

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Site 1: Schedule for the rubberwood Vacuum / Pressure treatment

Phase Vacuum / Pressure (Mpa) Duration (min)

Initial vacuum 0.02 15

Pressure 1.2 35

Final vacuum 0.015 10

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Fungicide F2 for stain control made in Jiangsu, China

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Tank for preparation of treating solution at Lezhong wood plant

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Control panal

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

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Site2: Schedule for the rubberwood

Vacuum / Pressure treatment Phase Vacuum / Pressure (Mpa) Duration (min)

Initial vacuum 0.02 15

Pressure 1.1 60

Final vacuum 0.02 10

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

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RW timber before treatment

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Air drying after treatment prior to kiln

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5.2 Results

This field demonstration indicated that F2 could prevent the treated timber for 15-20 days from stain and mold during air drying.

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Fungicide carbendazim (F2) can be used for stain and mold control instead of NaPCP.

Conclusion for 5

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Related publications of this RW project:

Mingliang Jiang, Terry L. Highley, Leslie Ferge, Thomas L. Woods. Laboratory Evaluation of Chrolothalonil Formulation for Stain and Mold Control on Rubberwood and Maple, International Research Group on Wood Preservation, IRG/WP 98-30175. 29th IRG, Maastricht, Netherlands, June 14-19, 1998.

Mingliang Jiang. Polit test of antisapstain and mold formulations on rubberwood, China Wood Industry (Chinese), 2001,2

Mingliang Jiang. China Wood Industry (Chinese), 1998, 12(3). Mingliang Jiang. Current Research Situation of the New Wood P

reservative Chlorothalonil, China Wood Industry, 1997,11(4), 21-22.

Xiuying Liu, Mingliang Jiang. Currently Situation of Rubberwood Processing and Utilization Technology in China, China Wood Industry, 1997, 11(5), 6-8.

Mingliang Jiang et al. Overview on Rubberwood Preservation Technology, China Wood Industry, 1996, 10(6), 22-24.

ITTO technical report: Currently Situation of Rubberwood Processing and Utilization Technology in China, CRIWI, Beijing, 1995.

Mingliang Jiang et al. Laboratory test of blue stain control by chemicals, IRG 07-30430

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The support and cooperation of Lezhong and Cangjiang wood plant for the field treatment are much appreciated.

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Thanks for your attention! wish you have a nice stay during the

workshop and visiting tour around the Island.

Documents

RESEARCH INSTITUTE OF WOOD INDUSTRY (CRIWI), CHINESE ACADEMY OF FORESTRY (CAF) 1 Rubberwood preservation by friendly preservatives Mingliang Jiang, Zhijun