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Polylactic acid nanometer bubble hole foaming material and preparation method thereof

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

Active Publication Date: 2019-02-19
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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  • Polylactic acid nanometer bubble hole foaming material and preparation method thereof
  • Polylactic acid nanometer bubble hole foaming material and preparation method thereof
  • Polylactic acid nanometer bubble hole foaming material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] This embodiment provides a polylactic acid nanocellular foaming material, the raw materials of which 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 (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 mat...

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 w...

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 nanometer bubble hole foaming material and a preparation method thereof. The method includes the steps that polylactic acid and biodegradable polyester are subjected to vacuum drying, then polylactic acid, biodegradable polyester and a foaming processing agent are subjected to melt blending through an internal mixer, then a blended material is subjected tohot pressing to be prepared into a flaky standby foaming sample; the standby foaming sample is put into a high-pressure kettle, a physical foaming agent is added for kettle pressure foaming, the kettle is kept for 1-10 hours at equal temperature and equal pressure, then rapid depressurizing is conducted in the kettle until normal pressure is reached, and therefore the polylactic acid nanometer bubble hole foaming material is prepared. Foaming temperature is controlled and set within the section of cold crystallization of polylactic acid, foaming is conducted, the foaming temperature is much lower than that of regular polylactic acid foams, during foaming, most polylactic acid is still in a rubber state, when air bubbles are increased, the increase speed of bubble holes can be effectively restrained, and therefore the foaming material has a large bubble hole size and a high bubble hole 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 Applications(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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