文献类型：专利

英文题名：Method for preparing green polyester foaming plate, involves subjecting polyester particles into extrusion process, followed by placed in high-pressure vessel, filling with carbon dioxide, and performing first cycle of saturation

作者：ZHAO L;XIA T;LIU T;XI Z;JIANG R

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN107775862-A

申请日：2016-08-27

公开日：2018-03-09

语种：英文

收录：DERWENT

摘要：NOVELTY - A green polyester foaming plate preparing method involves subjecting the polyester particles into extrusion process to prepare a polyester sheet. The polyester sheet is placed in a high-pressure vessel, filled with carbon dioxide, and performed first cycle of the polyester saturated with carbon dioxide, released the pressure and started the carbon dioxide saturation process for second cycle. The polyester sheet saturated with carbon dioxide is heated and foamed to obtain polyester foamed material, which is cooled, washed, dried, and subjected to isothermal annealing treatment. USE - Method for preparing green polyester foaming plate. ADVANTAGE - The method enables preparing the green polyester foaming plate with high-efficiency, effectively shortening the time of saturated polyester solid-state foaming, increasing carbon dioxide concentration in the polyester matrix and improving foaming rate of polyester foaming material. DETAILED DESCRIPTION - A green polyester foaming plate preparing method involves subjecting the polyester particles into extrusion process and/or calendering to prepare a polyester sheet. The polyester sheet is placed in a high-pressure vessel, filled with carbon dioxide to saturation pressure, and performed first cycle of the polyester saturated with carbon dioxide, maintained the saturation temperature during the saturation of the entire polyester carbon dioxide, after completing the first saturation cycle and released the pressure in the high-pressure vessel to atmospheric pressure, recharged carbon dioxide to the saturation pressure and started the carbon dioxide saturation process of the polyester for second cycle and repeated the step including carbon dioxide saturation of the polyester-pressure relief until the carbon dioxide concentration in the polyester matrix reaches a certain value. The polyester sheet saturated with carbon dioxide is heated to the foaming temperature and foamed for a certain period of time to obtain polyester foamed material. The polyester foamed material is cooled in a water bath at room temperature to prevent the cells from growing, washed the polyester foamed material and performed drying treatment. The polyester foam material is subjected to isothermal annealing treatment with the protection of atmospheric nitrogen gas during the process.