MOKUZAI HOZON (Wood Protection)
Online ISSN : 1884-0116
Print ISSN : 0287-9255
ISSN-L : 0287-9255
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Volume 40, Issue 1
Displaying 1-6 of 6 articles from this issue
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Commentation
Original Article
  • Effects of solvolysis wood additives on weatherability of wood plastic composites（WPCs）
    Masahiko KOBAYASHI, Makoto KIGUCHI, Yutaka KATAOKA, Atsuko ISHIKAWA, S ...
    2014 Volume 40 Issue 1 Pages 8-16
    Published: 2014
    Released on J-STAGE: March 07, 2014
    DOIhttps://doi.org/10.5990/jwpa.40.8
    JOURNAL FREE ACCESS
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    Wood plastic composites (WPCs) were manufactured with additives that were prepared by wood solvolysis. Effects of these additives on the weatherability performances were evaluated. The additives were prepared by two types of solvolysis solvent: hydrophilic polyoxyethylene and hydrophobic long chain fatty alcohol. WPCs (polypropylene/wood flour) were manufactured with various amounts of the additives by extrusion molding. A xenon weather meter was used for accelerating wethering tests and weatherability was evaluated by color change, chalking resistance and changes in surface properties. The results showed that weatherability of WPCs could be improved because of suppressing chalking by adding solvolysis wood that has hydrophobic side chains.
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  • Investigation of factors in the efflorescence of fire retardant woods
    Masayuki KAWARASAKI, Yasushi HIRABAYASHI
    2014 Volume 40 Issue 1 Pages 17-24
    Published: 2014
    Released on J-STAGE: March 07, 2014
    DOIhttps://doi.org/10.5990/jwpa.40.17
    JOURNAL FREE ACCESS
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    Fire retardant impregnated wood (FRW) was tested for moisture absorbency in high moisture condition. Fire retardant chemicals were two commercial phosphoric acid types and mixture of phosphoric acid type and boric acid type. The effect of chemical type, chemical retention and exposure relative humidity upon the moisture absorbency of FRW was investigated. And chemical's efflorescence of FRW was presumed from the amount of chemical dissolving drops occurred on surface of specimens during test. Maximum moisture absorption was affected by chemical type, and increased with increasing exposure relative humidity. Among the same chemical type, maximum moisture absorption of specimen increased with chemical retention, and their relationship was linear. The amount of drops on the surface of specimen was affected by chemical type, and increased with chemical retention and exposure relative humidity. Specimen that observed larger amount of drop, tended to show higher maximum adsorption. We concluded that chemical's efflorescence of FRW was related to moisture absorbency, and affected by chemical type, chemical retention and exposure relative humidity.
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