耐燃藥劑吸收量與加速劣化處理對木材機械性質之影響

Effects of Chemical Retention and Accelerated Degradation Treatment on Mechanical Properties of Fire-retardant Treated Wood

莊鴻濱(Horng-Bin Chuang) ； 王松永(Song-Yung Wang) ； 林法勤(Far-Ching Lin)

《林產工業》 18卷4期 (1999/12) Pp. 443-454

摘要

本研究係將杉木與硬槭木以充細胞法注入耐燃藥劑後，進行高溫加速劣化處理，以探討不同藥劑吸收量對耐燃處理材機械強度性質的影響，其結果顯示，厚度膨脹率隨藥劑吸收量的增加而增加，且有弦向大於徑向的趨勢。杉木與硬槭木耐燃藥劑處理材經80天加速劣化處理前後，吸收量對強度性質的影響不顯著。經80天高溫加速劣化後杉木與硬槭木耐燃處理材其各項強度性質均隨加速劣化處理處理天數的增加而降低，硬槭木耐燃處理材的強度降低率大於杉木，杉木的靜曲強度、靜曲彈性係數、縱向壓縮強度、縱向壓縮彈性係數與剪斷強度分別下降31.6～33.0%、13.1～15.6%、16.9～19.0%、4.6～8.3%、31.5～34.6%，而硬槭木則分別下降49.6～51.7%、16.9～20.8%、16.2～22.7%、17.3～24.2%、35.1～40.7%。藥劑濃度對膠合強度的影響，依木材強度與藥劑吸收量的不同而不同，杉木耐燃處理材在藥劑濃度25%以下並不會對膠合強度產生影響，但硬槭木耐燃處理材藥劑濃度在10%以上即對膠合強度產生影響。

關鍵字

吸收量 ； 耐燃劑 ； 加速劣化處理 ； 杉木 ； 硬槭木 ； 機械性質

並列摘要

The purpose of this study was to investigate the effect of chemical retention on mechanical properties of fire-retardant treated China-fir and maple solid wood. Specimens were impregnated with fire retardant solution by full-cell method. Results shown that the percentage of swelling increased with increasing chemical retention, and the tangelial swelling percentage was large than radial direction. for fire-retardant treated. The mechanical properties were not influenced by chemical retention of fire-retardant treated wood before and after 80 days of accelerated degradation treated. After 80 days of high temperature heating treatment tests, the mechanicalstrength decreased linearly with increasing exposure time, and the decreased percentage of strength properties in maple was larger than that of China-fir. The decreasing percentage of strength properties after 80 days exposed were: China-fir, 31.6~33.0% for σb, 13.1~15.6% for Eb, 17.1~19.0% for σc, 4.6~8.3% for Ec, 31.6~34.6% for τ; Maple, 49.6~51.7% for σb, 16.9~20.8% for Eb, 16.4~22.7% for σc, 17.3~24.2% for Ec, 35.1~40.7% for τ respectively. The change of relationships between chemical concentration and gluing strength varied with strength of wood and chemical retention. For China-fir, the chemical concentration below 25% did not influence significantly on gluing strength. However, for maple, the chemical concentration larger than 10% did influence significantly on gluing strength.

並列關鍵字

Retention ； Fire retardant ； Accelerated degradation treatment ； China-fir ； Hard maple ； Mechanical property