Method for preparing polylactic acid/montmorillonite nano composite material by in-situ polymerization

Patent name: A method for in-situ polymerization of polylactic acid/montmorillonite nanocomposites Patent applicant Applicant Tongji University Principal Appr. 200092 Inventor Ren Jie, 1239 Siping Road, Shanghai; Yang Shuang Application (Patent) No. 200510023647.7 Date of Application 2005.01.27 Certification date Approval notice No. 1654541 Approval announcement date 2005.08.17 Instruction CD-ROM D0533 Main classification number C08L67/04 Classification number C08L67/04; C08G63/78; C08K3/34 division Original application number The invention belongs to the technical field of polymer materials, in particular to a method for in-situ polymerization preparation of polylactic acid/montmorillonite nano composite material. First, the layered sodium montmorillonite is cation exchanged with an organic intercalating agent (including various amino acids and long chain alkyl ammonium salts) by cation exchange method, and then the lactide and the organically modified montmorillonite are appropriately In-situ polymerization under the action of the catalyst, the lactide monomer or lactic acid oligomer is gradually inserted into the montmorillonite sheet during the polymerization process, resulting in the sheet being stretched, and finally uniformly dispersed in the polylactic acid matrix to form the intercalation. Layered or exfoliated polylactic acid/montmorillonite nanocomposites. This material can be widely used in the field of packaging materials. Sovereignty Item 1. A method for in-situ polymerization of polylactic acid/montmorillonite nanocomposites, characterized in that the specific steps are as follows: (1) Sodium montmorillonite modification: The cation exchange method is adopted and the temperature is controlled at 70-100. °C, the montmorillonite is modified with an intercalating agent, wherein the intercalating agent is various amino acids or quaternary ammonium salts; (2) polylactic acid/montmorillonite nanocomposites prepared by in-situ polymerization: obtained after cation exchange Organically modified montmorillonite and lactide as raw materials, in the presence of a catalyst, were polymerized in situ to obtain polylactic acid/montmorillonite nanocomposites. International publication of international applications entering Country Date patent agency Shanghai Zhengdan patent Agency Ltd. Lu Fei address of the representative institutions; Shengzhi Fan