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1.发明申请公开(公告)号：US20220097274A1
公开(公告)日：2022-03-31
申请号：US17421017
申请日：2019-07-18
发明人： Yanan SONG , Lejun WANG , Weiwei HUANG , Zongqiang ZHENG , Yining LIU
IPC分类号： B29C48/00 , B29C48/385 , B29C48/92 , B29C48/395 , B29C48/36 , C08J9/14 , B29C48/625
摘要： A method for directly preparing a foamed polylactic acid (PLA) product from a PLA melt includes PLA melt preparation, feeding, and two-stage extrusion. In the two-stage extrusion, a pressure at an outlet of a first-stage twin-screw extruder is 15 MPa to 17 MPa, a PLA melt is fed at a rate of 250 kg/h, a foaming additive is fed at a rate of 7.5 kg/h to 10 kg/h, and a foaming gas is fed at a rate of 2.8 L/h to 7.5 L/h. The method can ensure both foamability and quality of a material and reduce more than ⅓ of energy consumption; and an obtained product has an adjustable foaming rate of 3 to 25, a crystallinity of 40.3% to 48.5%, a tensile strength of 8.7 MPa to 19.6 MPa, and an apparent density of 0.05 g/cm3 to 0.4 g/cm3.
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公开(公告)号：US20220088840A1
公开(公告)日：2022-03-24
申请号：US17419308
申请日：2019-07-18
发明人： Weiwei HUANG , Lejun WANG , Yanan SONG , Zongqiang ZHENG , Yining LIU
IPC分类号： B29C44/08 , C08J9/00 , C08J9/14 , C08K3/34 , B29C44/50 , B29C48/00 , B29C48/14 , B29C48/38 , B29C48/88 , B29C48/92 , B29C48/07 , B29C44/34 , B29C44/56
摘要： A preparation method of a high-rate foamed polylactic acid (PLA) sheet includes first-stage extrusion, second-stage extrusion, and foamed sheet extrusion. The method requires the following raw materials in parts by mass: 88 to 94 parts of PLA, 1 to 2 parts of a nucleating agent, 2 to 5 parts of a foaming agent, and 2 to 5 parts of an additive. The new method effectively solves the problems of low foaming rate, low strength, and the like in the industrial production using carbon dioxide, and a prepared PLA sheet with high foaming rate and excellent surface performance can be used in the fields of food packaging, disposable fully-degradable lunch boxes, and the like.
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