Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/66014
標題: 以廢紙製備聚乳酸及聚乳酸塗佈紙的研製
Preparation of PLA from Wastepaper and Manufacturing of PLA Coated Paper
作者: 陳言銘
Chen, Yan-Ming
關鍵字: 回收廢紙;recycled wastepaper;聚乳酸;乳酸菌;直接聚合;開環聚合;聚乳酸塗佈紙;polylactide;lactic acid bacteria;direct polymerization;ring opening polymerization;polylactide coated paper
出版社: 森林學系所
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摘要: 
聚乳酸(Polylactide)是在自然環境下可被水及微生物降解的材料,藉由合成因子的調控可以改變聚乳酸的性質並賦予聚乳酸製品各種不同的用途。目前乳酸的生產方式主要以葡萄糖為原料,利用乳酸菌進行發酵,最後從發酵液中即可萃取純化出乳酸。若能利用木質廢棄物來生產乳酸,將可有效降低聚乳酸的生產成本,同時提高木質廢棄物的利用價值。本篇論文以回收廢紙作為原料,經過一連串的化學轉換(硫酸水解糖化、發酵、聚合)並縮聚合反應合成出聚乳酸,再將其作為耐水紙塗佈材料進行耐水紙的製備試驗,使紙品具備多功能之特殊機能紙,如抗水抗油產品、免洗餐具等。以上應用試驗分三大方面進行,分別為酸水解產糖並發酵產乳酸、高分子聚乳酸合成、以及聚乳酸塗佈紙的製備。
在酸水解方面,以72%硫酸對回收廢紙進行酸水解,最高可得約81%的葡萄糖,再以所產之糖類進行乳酸發酵,使用菌種為Lactobacillus paracasei subsp. pacasei,在適當條件下發酵72小時每莫耳葡萄糖約可產1.87 mole乳酸。在聚乳酸合成方面,以直接聚合法進行合成,在催化劑辛酸亞錫添加量0.3%,反應溫度190℃,反應24小時可得平均分子量12,248的聚乳酸,以開環聚合法進行合成,在催化劑辛酸亞錫0.3%添加下,反應溫度150℃進行12小時可得最高平均重量分子量44,730。在塗佈紙製備方面,結果顯示,若以PVA做黏著劑進行塗佈,當聚乳酸分子量10,000,塗佈量達8 g/m2以上時,塗佈紙之抗張強度約可提升20%,適當塗佈方法下伸長率可提升40%,抗張強度在濕潤後的保留率達60%以上,效果接近市售紙杯的抗水性質,Cobb吸水度方面由未塗佈的30.21 g/㎡降至10.03 g/㎡,塗佈後之抗水性質明顯獲得提升。

The polylactide is biodegradable plastic that can be degraded by water and environmental microorganisms. We can offer it different properties using different synthetic factors. Currently, lactic acid is produced from the fermentation of glucose with lactic acid bacteria, then followed by steps of extraction and purification. If lactic acid could be produced from wood base waste material, the producing cost of polylactide will be effectively reduced and wood base waste material will be more valuable.
This study will describe the methodology of isolating glucose from recycled wastepaper, and converting through a series of chemical process to polylactide, then coating polylactide on base paper to produce functional paper, such as waterproof products and disposable utensils. There are three major aspects of investigation, including acid hydrolysis and fermentation of lactic acid, synthesis of polylactide, and manufacturing of polylactide coated paper. In terms of acid hydrolysis, using 72% concentrated sulfuric acid to hydrolyze the recycled waste paper, and the maximum yield of glucose is about 81%. Then fermentation of these sugars to lactic acid with bacteria, Lactobacillus paracasei subsp. pracasei. Each mole of glucose can produce 1.87 mole lactic acid. In terms of polylactide synthesis, using direct polymerization and ring opening polymerization,. The results indicated that the optimal condition of the direct polymerization method is lactic acid added 0.3% stannous octoate at 190 ℃ for 24 hours. The best distribution of average molecular weight of polylactide can be obtained under this condition, and the molecular weight is 12,248. On the other hand, with ring-opening polymerization method, lactic acid was added 0.3% stannous octoate at 150℃ for 12 hours, and more than 44,730 molecular weight of polylactide were obtained. In terms of manufacturing of polylactide coated paper, using two coating methods, one is solution coating method and the other is polylactide particles with PVA as coating binder method. The results indicated that when paper were coated with PVA as coating binder, the tensile strength of coated paper can be improved about 20% with the molecular weight 10,000 of polylactide and the coating amount of 8 g/㎡. It also effectively improve the elongation about 40%, the retention of wet tensile strength is more than 60%. And the water absorption of Cobb test of PLA coated paper was from 30.21 g/㎡ down to 10.03 g/㎡ after coating , it showed that water resistant properties were greatly improved.
URI: http://hdl.handle.net/11455/66014
其他識別: U0005-2208201115375800
Appears in Collections:森林學系

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