二軸スクリュ押出機を用いた水酸化アルミニウム難燃剤を含有したポリ乳酸組成物のケミカルリサイクル

• Published in: 成形加工 Vol. 22; no. 11; pp. 638 - 644
• Main Authors: 西田, 治男, 安田, 信彦, 白井, 義人, 橋本, 憲明, 附木, 貴行, 柳田, 大輝
• Format: Journal Article
• Language: Japanese
• Published: 一般社団法人 プラスチック成形加工学会 2010
• ISSN: 0915-4027; 1883-7417
• DOI: 10.4325/seikeikakou.22.638

For the chemical recycling of poly (L-lactic acid) (PLLA) component in fire-resistant polymer alloys used for electric/electronic equipments, effects of Al(OH)3 added as a flame retardant on the thermal depolymerization of PLLA component were evaluated. As a result of examining the conversion from the PLLA/PP/Al(OH)3 [14/56/30(wt/wt/wt)] compounds to lactide monomer, L, L-lactide purity of 90％ was achieved under the recovery ratio of about 90％. Furthermore, the combination of Al(OH)3 and MgO accelerated PLLA depolymerization as synergetic catalyst to generate L, L-lactide. This study used with a practical twin screw extruder is the first achievement as an efficient chemical recycling system to obtain lactide monomer recovery from PLLA compounds.