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Preparation and Properties of Compressed Preservative-treated Wood (CPW)

Author: MaoJia
Tutor: CaoJinZhen
School: Beijing Forestry University
Course: Wood Science and Technology
Keywords: Fir heartwood and sapwood Anticorrosive Hot compression Corrosion resistance
CLC: TS653
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 0
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Abstract

In this study, using different conditions of hydrothermal conditions on the fir heartwood of the fast-growing wood, sapwood and heart side admixture pretreatment, after radial compression, and the use of compression deformation restoring force to absorb the water-borne preservatives ACQ-D system into compressed wood preservative (CPW). Not only from the physical and mechanical properties improved, while taking advantage of the heat to compression treatment increased fir fast-growing wood, and is part of the permeability of the heartwood, ACQ-D to better penetrate into the wood. Through this study, the following conclusions can be drawn: 1) by examining the water bath immersion, the water jet treatment and the steam treatment liquid absorption amount of the three water thermal pretreatment of CPW prepared, compressive deformation recovery rate, surface hardness, thickness direction of the density distribution, and CuO distribution shows that the hydrothermal pretreatment can not only effectively softening the test material, to prevent the destruction of the tested material generated during the compression process, but also allows the density distribution of the CPW and CuO more uniform distribution. 80 ° C water bath water bath soak and spray treatment comparisons soak 4 hours is more appropriate pretreatment; same time, through the the steam pretreatment orthogonal analysis shows that, to optimize the process parameters 120 ° C processing 60min; 22 ) a good corresponding relationship between the deformation recovery ratio and the liquid absorption amount, the greater the general deformation recovery rate, the greater the amount of liquid-absorbent, the surface hardness is low, however, when the dwell time to reach a certain range, the surface hardness affected. The distribution of the density distribution of the test materials with CuO always consistent, and rendering surface, gradually descending to the inner trend. Denser, more adsorption sites of the copper in the wood cell wall components, and therefore the higher the amount of CuO hold; 3) thermal compression speed on the performance of the CPW greater impact. When thermal compression speed using 3mm/min, the liquid absorption amount of each group of tested material, compressive deformation recovery rate higher; simultaneously the unit volume of the amount of drug absorption is also higher. Matrix portion of the cell wall more susceptible to the influence of the thermal compression, when the compression speed is lower, the matrix is ??fixed component and a hydrophobic hydrogen bonding combined with the more, resulting in compression and deformation recovery lower; 4) thermal compression The treatment can effectively increase the permeability of the fir heartwood and sapwood preservative ACQ-D. Compared with the treated wood is not compressed, liquid uptake by the compression process fir sapwood can be increased by 1.5 times; heart side of mixed materials the center material surface and the surface of the sapwood embalming fluid drug loading can be increased to the same range; 5 determine the the match fir sapwood preservatives fir heartwood decay resistance phase-retention of) was measured using a rapid laboratory corrosion measurement method the unprocessed fir heartwood, and reach different to keep the amount of weight loss rate of fir sapwood, which reference fir preservative treatment.

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