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High-strength super-tough polylactic acid nano-pore foaming material and preparation method thereof

A foaming material, polylactic acid technology, applied in the field of biodegradable polymer foaming materials, can solve the problems of uneven cell size distribution, complicated polylactic acid nano-foaming material method, etc., to achieve enhanced mechanical properties and preparation methods Ease of operation and the effect of widening the application range

Active Publication Date: 2020-08-25
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned technical problems such as complex methods for preparing polylactic acid nano-foaming materials and uneven cell size distribution in the prior art, the purpose of the present invention is to provide a polylactic acid nano-porous foaming material and a preparation method thereof

Method used

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  • High-strength super-tough polylactic acid nano-pore foaming material and preparation method thereof
  • High-strength super-tough polylactic acid nano-pore foaming material and preparation method thereof
  • High-strength super-tough polylactic acid nano-pore foaming material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The preparation method of the polylactic acid nanoporous foam material of this embodiment specifically includes the following steps:

[0047] Step 1: Place the polylactic acid a in a vacuum drying oven, dry it at 60°C for 8 hours to remove moisture, and then heat-press it into a 6mm thick sheet at 200°C and 10MPa;

[0048] Step 2: The 6mm thick polylactic acid sheet obtained in step 1 is isothermally crystallized at 120°C for 5 hours to make its crystallinity reach 42%;

[0049] Step 3: Cut the polylactic acid sheet after isothermal crystallization in step 2 into 20mm×10mm×6mm small splines, and put them into the middle of the pressure-induced flow forming mold; then pressure-induced flow at a processing temperature of 120°C and a pressure of 180MPa Forming for 8 minutes, a polylactic acid spline with a length×width×thickness of 60mm×10mm×2mm is obtained;

[0050] Step 4: Place the polylactic acid spline formed by the pressure induced flow in step 3 in an autoclave, and soak fo...

Embodiment 2

[0052] The preparation method of the polylactic acid nanoporous foam material of this embodiment is basically the same as the method of embodiment 1, except that in step 4: the soaking temperature in this embodiment is 110°C, and the soaking time is 6h.

Embodiment 3

[0054] The preparation method of the polylactic acid nanoporous foam material of this embodiment is basically the same as the method of embodiment 1, except that in step 4: the soaking temperature in this embodiment is 120°C, and the soaking time is 4h.

[0055] Figure 1~3 Shown are the photos of the internal microstructure of the polylactic acid nanoporous foam materials prepared in Examples 1 to 3. As can be seen from the figure, all the polylactic acid materials have formed a large number of nano-sized cells and are evenly distributed. The statistical software calculates that the average cell size is 50~70nm, and the cell density is 5.1×10 15 ~6.3×10 15 Pcs / cm 3 . Compared with unfoamed polylactic acid, the tensile strength and impact strength of polylactic acid nano-foamed materials are greatly improved.

[0056] Table 1 Comparison table of process parameters and performance test results of polylactic acid nanoporous foam materials prepared in Examples 1 to 3

[0057]

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Abstract

The invention discloses a high-strength super-tough polylactic acid nano-pore foaming material and a preparation method thereof. The method comprises the following steps: firstly, carrying out vacuumdrying on a polylactic acid raw material, then carrying out hot pressing on polylactic acid to form a plate, and carrying out isothermal crystallization at 100-120 DEG C for 3-5 hours; cutting the polylactic acid plate subjected to isothermal crystallization into small sample strips, putting the small sample strips into the middle of a pressure-induced flow forming mold, and carrying out low-temperature pressure-induced flow forming for 5-10 minutes under the conditions that the temperature ranges from 80 DEG C to 130 DEG C and the pressure ranges from 30 MPa to 300 MPa; and putting the samplestrips subjected to pressure-induced flow forming into a high-pressure kettle, performing sealing, adding a physical foaming agent, soaking for 4-12 hours under the conditions that the temperature ranges from 100 DEG C to 120 DEG C and the pressure ranges from 8 MPa to 20 MPa, and obtaining the polylactic acid nano-pore foaming material through rapid pressure relief. The polylactic acid preparedby the method provided by the invention has a large number of uniformly distributed nanopores, and has excellent mechanical properties.

Description

Technical field [0001] The invention belongs to the field of biodegradable polymer foaming materials, and specifically relates to a high-strength super-tough polylactic acid nanoporous foaming material and a preparation method thereof. Background technique [0002] With the increasing environmental pollution problem, the development of a low-carbon, circular green economy has become urgent. In order to achieve a sustainable low-carbon recycling economy, the development of biodegradable polymer materials to replace ordinary petroleum-based polymer materials has become a hot spot. Polylactic acid (PLA) has been widely studied and applied due to its complete biodegradability and plant origin, and is known as the most promising biodegradable polymer. In recent years, polylactic acid has begun to be used in the field of polymer foam materials. Polylactic acid foam materials not only have the advantages of light weight, high specific strength, good toughness, and good heat and sound i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/04B29C44/34
CPCC08J9/122B29C44/3402B29C44/3438C08J2203/06C08J2203/08C08J2367/04C08J2205/042
Inventor 余鹏项佩陈绪煌赵西坡
Owner HUBEI UNIV OF TECH
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