Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/66182
標題: 以回收木粉和聚丙烯製備木材塑膠再生複合材之性質評估
Properties of wood-plastic recycled composites (WPC) made from recycled wood flour and polypropylene
作者: 楊子賢
Yang, Tsu-Hsien
關鍵字: 木材塑膠複合材;Wood-plastic composites;回收聚丙烯;抗拉強度;物理特性;Recycled polypropylene;Tensile strength;Physical properties
出版社: 森林學系所
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摘要: 
本試驗為探討不同原料組成對木材塑膠複合材(Wood plastic composite, WPC) 物理、機械及耐候性質之影響,在WPC之製程上主要使用回收聚丙烯(Recycled polypropylene, RPP)及SPF(Spruce-Pine-Fir)木粉為原料,再以押出成形方式製成。其中主要針對不同木粉粒徑大小、添加劑含量及木塑比對WPC機械與物理性質影響加以探討。結果顯示,使用小粒徑之木粉(<125μm)對WPC抗拉及抗彎強度的提升有較佳之效果,且可改變WPC之吸水性而減少材料收縮膨潤性。另外耦合劑(Maleic anhydride polypropylene, MAPP)和潤滑劑(Zinc stearate)的使用在WPC中最適比例皆為3%,加入適量之耦合劑能增進木材與塑膠之聯結,減少木纖維暴露於塑膠基質表面,可有效增進WPC之機械性質和其尺寸安定性,但過量使用耦合劑和潤滑劑則會降低其性質。最後,木粉/塑膠維持在50%或少於50%時有較佳之機械性質,超過50%時隨木粉含量的增加,其強度及各項物理性質會有逐漸降低之趨勢。
另外,本試驗亦探討不同木塑比所製備之WPC經戶外耐候與加速耐候試驗下之表面性質、物理與機械性質以及化學性質之變化,結果指出,WPC經戶外和加速耐候試驗後,抗彎強度與抗拉強度之損失、褪色情形及羰基指數皆隨耐候時間增長而增加。其中在強度之變化上,經過耐候試驗後,以木粉30%所製備之WPC,有較佳的強度保留率,而木粉60%製備者則有最差的表現。因此,考慮到最初的強度以及經耐候劣化試驗後之強度保留率,木粉50%所製備之WPC具有較佳的表現。

The studied wood-plastic composites (WPCs) here were extruded molding WPCs manufactured using recycled polypropylene (RPP) plastics and SPF wood flour. The study evaluated four parameters: (1) wood flour particle size; (2) coupling agent dosage; (3) lubricant content; and (4) the mass ratio of wood and RPPs. The results showed that using finer wood flour (<125 μm) can improve the tensile and flexural strength of WPCs, and reduce the swelling due to water adsorption. The optimal concentration of the coupling agent (Maleic Anhydride Polypropylene) and lubricant (Zinc stearate) in WPCs were both 3 wt%. Adding the proper amount of coupling agent can promote interfacial adhesion between wood and plastic, reduce the exposure of wood fibers to atmosphere, improve the mechanical properties and significantly reduce the swelling, but over-dosing the lubricant significantly increased swelling and reduced all the mechanical properties of the WPCs. Maintaining wood content at 50 wt% or less produced the best mechanical properties, and wood content above approximately 50 wt% resulted in reduction of strength and all physical properties of WPCs.
In addition, effects of different wood/plastic ratio on the surface characteristics, physicomechanical and chemical properties of WPCs during weathering test were also evaluated in this study. Results indicted that the bending and tensile strength loss, the level of color fading, and the carbonyl index of WPCs increased with increasing exposed time. Of all WPCs, which with 30% wood flour exhibited higher retained strength ratio, however, WPC with 60% wood had lower retained strength ratio than others after weathering. Concerned to physiccomechanical properties of WPCs and its retained strength ratio during exposed time, WPC manufactured with 50% wood flour is suggested due to its better performance.
URI: http://hdl.handle.net/11455/66182
其他識別: U0005-2208201223173600
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