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A kind of polylactic acid nano-cell foam material and preparation method thereof

A foaming material, polylactic acid technology, applied in the field of biodegradable polymer foaming material and its preparation, can solve the problems of uneven cell, low cell density, large cell size, etc., and achieve the purpose of suppressing the cell The effect of growth rate

Active Publication Date: 2021-08-31
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of the existing polylactic acid foam material such as large cell size, uneven cell density and low cell density, the object of the present invention is to provide a polylactic acid nanocellular foam material and a preparation method thereof. Nanocellular foam material is a biodegradable material with the advantages of small cell size, uniform cell distribution and high cell density.

Method used

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Embodiment 1

[0035] This embodiment provides a polylactic acid nanocellular foaming material, and its raw materials are as follows:

[0036] Polylactic acid, 2003D, Natureworks, USA; L-lactic acid content greater than 98%, melt flow rate 6g / 10min, melt strength 100mN;

[0037]Chain extender master batch (containing 10% epoxy oligomer), Joncryl 4360, German BASF company;

[0038] Nucleating agent PPZn (phenyl zinc phosphate), self-made in the laboratory; nucleating agent diameter 0.1-10μm, melting point 250-350℃;

[0039] Carbon dioxide, purity>99%, commercially available;

[0040] The specific content is shown in Table 1.

[0041] Table 1

[0042] sample Polylactic acid (parts) PBAT (number of copies) Nucleating agent (number of parts) Chain extender (parts) 1 100 0 0 0 2 100 0 0 3 3 100 0 0.5 3 4 100 0 0.5 0 5 80 20 0.5 3

[0043] The polylactic acid nanocellular foam material provided in this example is prepared according ...

Embodiment 2

[0051] This embodiment provides a polylactic acid nanocellular foaming material, and its raw materials are as follows:

[0052] Polylactic acid, 2003D, Natureworks, USA; L-lactic acid content greater than 98%, melt flow rate 6g / 10min, melt strength 100mN;

[0053] Poly adipate / butylene terephthalate, C1200, German BASF company;

[0054] Carbon dioxide, purity>99%, commercially available;

[0055] The specific content is shown in Table 3.

[0056] table 3

[0057] sample Polylactic acid (parts) PBAT (number of copies) 1 90 10 2 80 20 3 70 30

[0058] Put the above components in a vacuum drying oven, dry at 60°C for more than 10 hours to remove moisture, and then mix polylactic acid, polyadipate / butylene terephthalate (PBAT) according to the component ratios in Table 3 The agent was melt-blended at 190°C for 15 minutes through an internal mixer, and the speed of the internal mixer was 60 rpm; then the blend material was hot-pressed at 190°...

Embodiment 3

[0065] This embodiment provides a polylactic acid nanocellular foaming material, and its raw materials are as follows:

[0066] Branched polylactic acid, synthesized in laboratory, molecular weight 220,831g / mol, melt flow rate 4.7g / 10min, melt strength 300mN;

[0067] Carbon dioxide, purity>99%, commercially available;

[0068] The branched polylactic acid was placed in a vacuum drying oven, dried at 60°C for more than 10 hours to remove moisture, and then hot-pressed at 190°C to form a 2mm-thick sheet for foaming, and the hot-pressing time was 10min.

[0069] In the second step, put the sample prepared in the previous step into the autoclave and inject supercritical CO 2 Carry out pressure foaming in the kettle, the soaking temperature in the kettle is 100°C, and the soaking pressure is 20MPa; after isothermal and pressure soaking for a certain period of time (as shown in Table 5), open the pressure relief valve to quickly release the pressure in the kettle to normal pressur...

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Abstract

The invention provides a polylactic acid nano-cell foam material and a preparation method thereof. The method comprises: vacuum-drying polylactic acid and biodegradable polyester, then melting and blending polylactic acid, biodegradable polyester, and foaming processing aids through an internal mixer, and then hot-pressing the blended material Prepare the foaming sample in sheet form; put the foaming sample in an autoclave, add a physical foaming agent to foam under pressure in the autoclave, keep it at isothermal pressure for 1-10 hours, and then quickly release the pressure in the autoclave to normal pressure. The polylactic acid nano-cellular foam material is prepared. In the present invention, the foaming temperature is set in the cold crystallization range of polylactic acid by controlling the foaming temperature, and the foaming temperature is far lower than that of conventional polylactic acid foam, and most of the polylactic acid is still at In the rubber state, in the process of bubble growth, the growth rate of the cells can be effectively suppressed, so that the foamed material has a larger cell size and a higher cell density.

Description

technical field [0001] The invention relates to a biodegradable polymer foaming material and a preparation method thereof, in particular to a polylactic acid (PLA) nano-cellular foaming material and a preparation method thereof. Background technique [0002] With the shortage of resources and the increasing attention of human beings to environmental issues, the use of environmentally friendly polymers to replace traditional petroleum-based materials has become the development trend of future materials. As a biodegradable material processed from natural renewable resources, polylactic acid has been used in the preparation of foaming materials in recent years. Polylactic acid foam materials not only have the common characteristics of ordinary foam materials such as light weight, high specific strength, impact resistance, and good heat and sound insulation, but also have degradability and biocompatibility. They are widely used in food packaging and biomedicine. have great pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08J9/12
CPCC08J9/122C08J2203/06C08J2203/08C08J2205/044C08J2367/04C08J2467/02
Inventor 王向东陈士宏张玉霞余科松
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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