US 12,083,718 B2
Preparation method of high-rate foamed polylactic acid (PLA) sheet
Yanan Song, Ningbo (CN); Lejun Wang, Beijing (CN); Weiwei Huang, Ningbo (CN); Zongqiang Zheng, Ningbo (CN); and Yining Liu, Beijing (CN)
Assigned to JHM Engineering and Technology (Ningbo) Co., Ltd, Ningbo (CN)
Appl. No. 17/419,308
Filed by JHM Engineering and Technology (Ningbo) Co., Ltd, Ningbo (CN)
PCT Filed Jul. 18, 2019, PCT No. PCT/CN2019/096496
§ 371(c)(1), (2) Date Jun. 29, 2021,
PCT Pub. No. WO2020/134041, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811637504.9 (CN), filed on Dec. 29, 2018.
Prior Publication US 2022/0088840 A1, Mar. 24, 2022
Int. Cl. B29C 48/07 (2019.01); B29C 44/08 (2006.01); B29C 44/34 (2006.01); B29C 44/50 (2006.01); B29C 44/56 (2006.01); B29C 48/00 (2019.01); B29C 48/14 (2019.01); B29C 48/38 (2019.01); B29C 48/88 (2019.01); B29C 48/92 (2019.01); C08J 9/00 (2006.01); C08J 9/14 (2006.01); C08K 3/34 (2006.01); B29K 67/00 (2006.01)
CPC B29C 44/08 (2013.01) [B29C 44/3415 (2013.01); B29C 44/50 (2013.01); B29C 44/5672 (2013.01); B29C 48/0012 (2019.02); B29C 48/07 (2019.02); B29C 48/144 (2019.02); B29C 48/38 (2019.02); B29C 48/9135 (2019.02); B29C 48/92 (2019.02); C08J 9/0066 (2013.01); C08J 9/148 (2013.01); C08K 3/34 (2013.01); B29K 2067/046 (2013.01); C08J 2201/03 (2013.01); C08J 2367/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A preparation method of a high-rate foamed polylactic acid (PLA) sheet, comprising first-stage extrusion, second-stage extrusion, and foamed sheet extrusion, wherein the first-stage extrusion is conducted with the following raw materials in parts by mass: 88 to 95 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; and the foaming agent is a fluorine-containing compound, wherein the foaming agent is any one from the group consisting of difluoromonochloromethane, trifluorotrichloroethane, and tetrafluorodichloroethane, and wherein the high-rate foamed PLA sheet has a foaming rate of 13 to 16, a tensile strength of 80 Mpa to 88 Mpa, and a bending strength of 120 Mpa to 128 Mpa.