パーティクルを化学処理して製造したボードの耐久性について(<小特集>木質材料小特集)

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Low molecular-weight phenolic resin as impregnating resin (IPR, <Mn>^^^-=389) and high molecular-weight one (<Mn>^^^-=962) were mixed and sprayed on sugi (Cryptomeria japonica) particles, and 10 mm thick single-layer parricleboards (PBs) (SG=0.7) were produced. On the other hand, seraya (Shorea spp.) particles were treated with acetic anhydride to attain at a 16% weight gain by replacing hydroxyl units of wood components with acetyl ones. The acetylated, non-acetylated, and mixed (50 : 50 weight ratio) particles were pressed into low density PBs with densities of 0.4 and 0.5g/cm^3 using polymerictype urethane resin adhesive. The specimens of these two kinds of PBs and untreated PBs were subjected to various accelerated aging treatments : a) 6-cycle ASTM D-1037 exposure, b) 6-cycle WCA-MA exposure, c) cyclic boil-dry test, d) BS 5669 test, and E) cyclic soak-dry test. Thickness swelling (TS) and internal bond strength (IB) were measured afuter each step of each cycle. The TS after treatment a) was affected greatly by the addition of IPR or the acetylation treatment. After aging-exposure test a), the TS value of the PBs with only 5% IPR loading or the acetvlated PBs was about a half of that of the control boards. THe spring back was rarely observed for the treated PBs with 20% IPR loading after cyclic exposure test of a), b), c,) and d). The exposure test affecting most severely TS and IB retention of PBs was test a), followed by tests b), c), and d), in order.
社団法人日本材料学会の論文
1992-02-15

パーティクルを化学処理して製造したボードの耐久性について(<小特集>木質材料小特集)

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