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Physical aging-resistant polylactic acid porous material as well as preparation method and application thereof

A porous material and physical aging technology, which is applied in the field of polylactic acid materials and polylactic acid porous materials, can solve the problems of material brittleness, brittleness, and physical aging, and achieve the effects of maintaining stability, favorable preparation process, and broad application prospects

Active Publication Date: 2021-02-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above known technologies can prepare polylactic acid foamed materials, under the current technical conditions, polylactic acid foamed materials are not strictly designed and controlled from the molecular essence of resistance to physical aging and process steps, and are easy to be used in the storage and logistics stage (shelf). During the period) physical aging causes rapid brittleness; for example, the process of bonding foamed particles through water vapor can easily induce physical aging and cause the material to become brittle

Method used

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  • Physical aging-resistant polylactic acid porous material as well as preparation method and application thereof
  • Physical aging-resistant polylactic acid porous material as well as preparation method and application thereof

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preparation example Construction

[0037] Another aspect of the embodiments of the present invention provides a method for preparing a polylactic acid porous material resistant to physical aging, comprising:

[0038] Provide dry polylactic acid or polylactic acid dry mixture;

[0039] Melting and extruding the dry polylactic acid or polylactic acid dry mixture through a screw extrusion device;

[0040] The polylactic acid melt directly enters the injection foaming equipment, one-step foaming to form a polylactic acid foam product, and quenched; or the polylactic acid melt is extruded to form a polylactic acid sheet, then soaked in high-pressure fluid, heated and foamed to form a polylactic acid porous sheet material (two-step method), quenching.

[0041] The preparation method of the present invention is not limited to the above two preparation processes, no matter which one of the numerous foaming processes is adopted, as long as the foamed sample is quenched instantaneously, and then treated for a certain pe...

Embodiment 1

[0107] Take polylactic acid with a weight average molecular weight of 150,000 and a molar content of L optical isomer of 95% for hot air drying at a drying temperature of 95±2°C, a drying time of 8 hours, and a water content of 50ppm; The material is fed into the screw extrusion equipment, and injected with high-pressure fluid, and melted and extruded to obtain a polylactic acid melt, wherein the screw temperature is 190 ° C, and the melt pressure is 12 MPa; the polylactic acid melt is further input into the mold of the injection foaming equipment. cavity, and carry out pressure holding, mold opening, and foaming treatment. The temperature of the mold cavity is 92°C, the holding pressure is 15MPa, and the expansion ratio is 15. After that, it is rapidly quenched to room temperature at a quenching rate of 25°C / s. The quenching time is 3 seconds, and the polylactic acid porous material with a three-dimensional porous structure is obtained; the polylactic acid porous material is f...

Embodiment 2

[0109] Take polylactic acid with a weight average molecular weight of 300,000 and a molar content of L optical isomer of 95% for hot air drying at a drying temperature of 95±2°C, a drying time of 8 hours, and a water content of 45ppm; The material is fed into the screw extrusion equipment, and injected with high-pressure fluid, and melted and extruded to obtain a polylactic acid melt, wherein the screw temperature is 220 ° C, and the melt pressure is 16 MPa; the polylactic acid melt is further input into the mold of the injection foaming equipment. cavity, and carry out pressure holding, mold opening, and foaming treatment. The temperature of the mold cavity is 102°C, the holding pressure is 30MPa, and the expansion ratio is 22. After that, it is rapidly quenched to room temperature at a quenching rate of 8°C / s. The quenching time is 10 seconds, and the polylactic acid porous material with a three-dimensional porous structure is obtained; the polylactic acid porous material is ...

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Abstract

The invention discloses a physical aging-resistant polylactic acid porous material as well as a preparation method and application thereof. The polylactic acid porous material has a three-dimensionalporous structure, and comprises 0 wt% to 85 wt% of a crystalline phase and 15 wt% to 100 wt% of an amorphous phase; the amorphous phase comprises 5wt% to 75wt% of a metastable phase, and a characteristic peak of the metastable phase in an infrared spectrogram appears at 918cm<-1>. The polylactic acid porous material disclosed by the invention has the characteristic of physical aging resistance, and the change rates of the yield strength and the elongation at break before and after storage are relatively small, so that the obtained disposable meal box, food packaging material, medical suppliesand other products have the strength equivalent to or superior to that of the existing polylactic acid foaming material; meanwhile, excellent physical aging resistance is achieved, the stability of the size and the performance can be kept in the warehouse logistics stage, and meanwhile, the preparation process is beneficial to large-scale production, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to a polylactic acid material, in particular to a polylactic acid porous material resistant to physical aging, its preparation method and application (disposable lunch box, foam toy, etc.), belonging to the technical field of foaming materials. Background technique [0002] With the vigorous development of the global petroleum industry, a large number of petroleum-based polymers are made into foamed products every year, which are used in plastic packaging, biomedical and daily life and other fields. However, the uncertainty of hygiene and safety caused by the precipitation of petroleum-based resin itself and related additives, as well as the "white" pollution caused by the non-degradability of petroleum-based resins to the environment, all affect the application of petroleum-based resins in packaging, biomedical and daily life. Widespread application casts a shadow. Therefore, it is particularly necessary to develop biodegradable...

Claims

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Application Information

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IPC IPC(8): C08J9/00B29C44/60B29C44/34B29C44/20C08L67/04
CPCC08J9/00B29C44/20B29C44/3415B29C44/60C08J2367/04
Inventor 黄威陈鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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