| abstract |
The invention discloses a polylactic acid foaming method, comprising the following steps: step A: dissolving a gas generating agent in water to prepare a solution; step B: mixing monomer or oligomer, thermal crosslinking agent with the aqueous solution of step A Mixing reaction to obtain the initial reaction mixture, the initial reaction mixture is ground after freeze-drying in a freeze-drying device; Step C: the polylactic acid resin and the ground initial reaction mixture powder of step B are mixed uniformly; Step D : Add the material after step C mixed uniformly into the extruder, set the process parameters of the extruder to melt and extrude, in the extrusion process, the gas generating agent is heated to generate expansion, so that the polylactic acid melt is foamed Form; Step E: The polylactic acid foam material is obtained by extruding the polylactic acid melt in Step D through an extruder and cooling to shape. The foaming method is simple and efficient, does not require special equipment, has low cost, is easy to operate and control, and the obtained foamed material has stable quality, uniform cell size and high foaming ratio. |