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Polylactic acid oriented microcellular foaming material and preparation method thereof

A technology of microporous foam material and polylactic acid, which is applied in the field of material synthesis, can solve problems such as poor mechanical properties, achieve the effect of reducing product density and improving mechanical properties

Active Publication Date: 2018-12-07
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a polylactic acid oriented microcellular foamed material and its preparation method, which can effectively solve the problem of poor mechanical properties of the existing foamed materials

Method used

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  • Polylactic acid oriented microcellular foaming material and preparation method thereof
  • Polylactic acid oriented microcellular foaming material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of polylactic acid oriented microporous foam material, comprising the following steps:

[0028] (1) The weight average molecular weight of 99.5 parts is 1×10 5 g / mol linear polylactic acid, mixed with 0.5 parts of antioxidant 1010, then dried in a vacuum oven at 80°C for 6 hours, and then placed in a high-speed blender to mix evenly;

[0029] (2) Put the product in step (1) in a co-rotating twin-screw extruder for melt blending, wherein the temperature of each section of the extruder screw is 150°C, 170°C, 180°C, 185°C, 185°C ℃, 170℃, 160℃, the screw speed is 150r / min; then the granules obtained by the extruder are dried in a vacuum oven at 80℃ for 8 hours, and then hot-pressed into dumbbell-shaped splines in a flat vulcanizer , the hot-pressing procedure is: preheating for 5 minutes, hot-pressing for 3 minutes, and cold-pressing for 5 minutes, wherein the hot-pressing temperature is 190°C and the pressure is 10MPa;

[0030] (3) The dumbbell-shape...

Embodiment 2

[0033] A preparation method of polylactic acid oriented microporous foam material, comprising the following steps:

[0034] (1) The weight average molecular weight of 79.5 parts is 1×10 5 g / mol linear polylactic acid, 20 parts weight average molecular weight is 3×10 5 g / mol linear polylactic acid and 0.5 parts of antioxidant 1010 were mixed, then dried in a vacuum oven at 80°C for 6 hours, and then placed in a high-speed blender to mix evenly;

[0035] (2) Put the product in step (1) in a co-rotating twin-screw extruder for melt blending, wherein the temperature of each section of the extruder screw is 160°C, 180°C, 185°C, 190°C, 190°C ℃, 180℃ and 170℃, the screw speed is 150r / min; then the pellets obtained by the extruder are dried in a vacuum oven at 80℃ for 8 hours, and then hot-pressed into a dumbbell-shaped spline in an injection molding machine. Among them, the temperature of each section of the screw of the injection molding machine is 160°C, 170°C, 190°C, and 190°C; ...

Embodiment 3

[0039] A preparation method of polylactic acid oriented microporous foam material, comprising the following steps:

[0040] (1) The weight average molecular weight of 79.5 parts is 1×10 5 g / mol linear polylactic acid, 20 parts weight average molecular weight is 2.1×10 5 g / mol three-arm star-shaped polylactic acid and 0.5 part of antioxidant 1010 were mixed, then dried in a vacuum oven at 80°C for 6 hours, and then placed in a high-speed blender to mix evenly;

[0041] (2) Put the product in step (1) in a co-rotating twin-screw extruder for melt blending, wherein the temperature of each section of the extruder screw is 150°C, 160°C, 170°C, 175°C, 175°C ℃, 170℃, 150℃, the screw speed is 150r / min; then put the pellets made by the extruder in a vacuum oven at 80℃ and dry for 8 hours, and then heat press them into dumbbell-shaped splines in a flat vulcanizer , the hot-pressing procedure is: preheating for 5 minutes, hot-pressing for 3 minutes, and cold-pressing for 5 minutes, whe...

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Abstract

The invention discloses a polylactic acid oriented microcellular foaming material and a preparation method thereof. The method comprises the following steps: (1) mixing polylactic acid A with polylactic acid B to obtain a mixture, adding an antioxidant again and then performing vacuum drying for 6 hours to 8 hours; (2) putting the obtained product obtained in the step (1) in an extruder and performing granulation, performing vacuum drying for 8 hours to 9 hours to obtain granules, and then performing hot pressing molding; (3) pre-heating the product obtained in the step (2), and stretching theproduct until the stretch multiplying power reaches 600 percent to 1200 percent, and cooling the product to a room temperature; and (4) swelling the product obtained in the step (3) for 50 minutes to60 minutes in a supercritical carbon dioxide environment, and then releasing pressure at a velocity of 10 MPa / min to 12 MPa / min, and cooling the product to a room temperature to obtain the microcellular foaming material. According to the microcellular foaming material prepared by the method disclosed by the invention, mutual existence of orientation and microcellular structure is realized, and the mechanical performance of the material is improved while the density of the product is reduced.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a polylactic acid oriented microcellular foaming material and a preparation method thereof. Background technique [0002] With the development of the economy and the progress of society, factors such as energy saving, environmental friendliness and cost have been paid more and more attention. Polymer structural materials are developing in the direction of energy saving, high efficiency and safety, and multi-functional composites. As a typical structural material, the research and development of new environmentally friendly polymer microporous foam materials is also very important. [0003] The performance of conventional polymer microcellular foamed materials is affected by factors such as cell size, distribution, and cell structure. Due to the great difference in the thermodynamic properties of the two phases of the polymer and the gas, the polymer foamed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/134C08J9/12
CPCC08J9/122C08J2203/06C08J2203/08C08J2367/04C08J2467/04
Inventor 李正秋陈宝叔赵天宝张义刘蕾彭娅
Owner XIHUA UNIV
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