Light high-strength polylactic acid foam material and method for preparing same

A technology of foam materials and polylactic acid, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of low PLA melt strength, high PLA foam density, and limitations on PLA applications, and achieve isolation Precise control of thermal properties, high foaming efficiency, and precise control of mechanical properties

Inactive Publication Date: 2019-04-05
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is worth noting that due to the low melt strength, slow crystallization rate and complex crystallization behavior of PLA, resulting in poor foaming ability, PLA foam prepared by conventional methods has relatively high density, uneven cells, and poor mechanical properties. , it is difficult to meet the performance requirements of conventional foam materials (such as polystyrene foam, polypropylene foam, etc.), which greatly limits the application of PLA and its foam materials

Method used

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  • Light high-strength polylactic acid foam material and method for preparing same
  • Light high-strength polylactic acid foam material and method for preparing same
  • Light high-strength polylactic acid foam material and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0066] A kind of method for preparing lightweight high-strength polylactic acid foam material, raw material is PLA, and its density is 1.24g / cm 3 (@23°C), the melt flow index is 10g / 10min; the modified filler is 100 mesh solid powder PTFE; the nucleating agent is 3000 mesh talc powder; the foaming agent used is supercritical carbon dioxide with a purity of 99.9%.

[0067] The method comprises the steps of:

[0068] (1) PLA, PTFE, and talcum powder were blended in a ratio of 96:1:3 by mass percentage to obtain a PLA-based compound;

[0069] (2) Add the PLA-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PLA-based compound is gradually plasticized and melted, and plasticized The temperature of the PLA-based composite melt after melting is 220°C, and the pressure of the PLA-based composite melt during the plastic...

Embodiment 2

[0076] A kind of method for preparing lightweight high-strength polylactic acid foam material, raw material is PLA, and its density is 1.24g / cm 3 (@23℃), the melt flow index is 60g / 10min; the modified filler is 1000 mesh solid powder PTFE; the nucleating agent is 10000 mesh montmorillonite powder; the foaming agent used is supercritical carbon dioxide with a purity of 99.9% .

[0077] The method comprises the steps of:

[0078] (1) PLA, PTFE, and montmorillonite were blended in a ratio of 77:8:15 by mass percentage to obtain a PLA-based composite;

[0079] (2) Add the PLA-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PLA-based compound is gradually plasticized and melted, and plasticized The temperature of the PLA-based composite melt after melting is 170°C, and the pressure of the PLA-based composite melt ...

Embodiment 3

[0086] A kind of method for preparing lightweight high-strength polylactic acid foam material, raw material is PLA, and its density is 1.24g / cm 3 (@23°C), the melt flow index is 40g / 10min; the modified filler is 10,000 mesh solid powder PTFE; the nucleating agent is 5,000 mesh calcium carbonate powder; the foaming agent used is supercritical nitrogen with a purity of 99.9%.

[0087] The method comprises the steps of:

[0088] (1) PLA, PTFE, and calcium carbonate powder are blended in a ratio of 82:15:3 by mass percentage to obtain a PLA-based composite;

[0089] (2) Add the PLA-based compound obtained in step (1) into a microcellular foaming injection molding machine, and under the double action of the shearing of the screw of the injection molding machine and the heating of the barrel, the PLA-based compound is gradually plasticized and melted, and plasticized The temperature of the PLA-based composite melt after melting is 210°C, and the pressure of the PLA-based composite ...

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Abstract

The invention relates to a method for preparing a light high-strength polylactic acid foam material, and belongs to the field of polylactic acid foam materials. The light high-strength polylactic acidfoam material is prepared by the aid of the method on the basis of coupling modification between PTFE (polytetrafluoroethylene) and nucleating agents. PLA (polylactic acid) foam products with the light and high-strength characteristics can be directly formed and prepared by the aid of the method, and the density, the mechanical properties and the heat-insulation performance of the PLA foam products can be accurately regulated and controlled in wide ranges. The method has the outstanding advantages of stability, reliability, high production efficiency, low cost and the like.

Description

technical field [0001] The invention belongs to the field of polylactic acid foaming materials, and in particular relates to a lightweight high-strength polylactic acid foaming material prepared by foaming injection molding based on coupling modification of polytetrafluoroethylene and a nucleating agent and a method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable and environmentally friendly plastic material that can be used as a substitute for fossil fuel-based plastic materials and has broad application prospects. Foaming can endow PLA plastic with more functional properties, making it have the characteristics of light weight, high elasticity, shock absorption, heat insulation, etc. PLA foam can be widely used in aerospace, automobiles, communication electronics, rail transit, packaging and transportation, Building insulation and other fields. At present, PLA foam products are mainly prepared in three ways. The first way is: first prepare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/06B32B27/18C08L67/04C08L27/18C08K3/34C08J9/12B29C44/42B29C44/02
CPCB29C44/02B29C44/422B32B27/065B32B27/18B32B27/36B32B2266/0264B32B2307/304B32B2419/00C08J9/122C08J2203/06C08J2203/08C08J2367/04C08J2427/18C08K3/34
Inventor 王桂龙柴佳龙赵国群魏超蒋文军
Owner SHANDONG UNIV
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