A kind of polylactic acid foam material with nano cells and preparation method thereof

A foam material and polylactic acid technology, applied in the field of polylactic acid foam materials, can solve the problems of unfavorable PLA nano-foam preparation, cell merging, cell size increase, etc. The effect of mechanical properties

Active Publication Date: 2021-02-19
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using CO 2 Preparation of PLA nanofoams is quite challenging, mainly because of the CO 2 Compared with nitrogen, CO 2 The diffusion coefficient is high, and the high diffusion coefficient is conducive to the rapid nucleation and growth of cells, but it is also easy to cause the cells to merge and increase the cell size, which is not conducive to the preparation of PLA nanofoam

Method used

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  • A kind of polylactic acid foam material with nano cells and preparation method thereof
  • A kind of polylactic acid foam material with nano cells and preparation method thereof
  • A kind of polylactic acid foam material with nano cells and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The polylactic acid foam material with nano-cells of embodiment 1, comprises the component of following quality:

[0059] Polylactic acid resin 59.937g;

[0060] Epoxy chain extender 0.06g;

[0061] Hydroxy-functionalized graphene (HG) 0.003g.

[0062] Such as figure 1 Shown, the preparation process of the polylactic acid foam material with nano-cell of embodiment 1 is as follows:

[0063] S1: Ingredients: equipped with the following components: 59.937g polylactic acid resin, 0.06g epoxy-based chain extender, 0.003g hydroxyl-functionalized graphene (HG);

[0064] S2. Dry the components obtained in step S1, put the components into a rotary cabinet rheometer for melting and blending, the melting temperature is 190 ° C, the rotation speed is 60 rads / min, and after blending for 15 minutes, a polymer with high melt strength is formed. Lactic acid blend;

[0065] S3. Cool the blend obtained in step S2, and use a flat plate rheometer to mold at a molding temperature of 19...

Embodiment 2

[0068] The polylactic acid foam material with nano-cells of embodiment 2, comprises the component of following quality:

[0069] Polylactic acid resin 57g;

[0070] Anhydride chain extender 1.5g;

[0071] Hydroxy-functionalized graphene (HG) 1.5g.

[0072] Such as figure 1 Shown, the preparation process of the polylactic acid foam material with nano-cell of embodiment 2 is as follows:

[0073] S1: Ingredients: equipped with the following components: 57g polylactic acid resin, 1.5g anhydride chain extender, 1.5g hydroxyl-functionalized graphene (HG);

[0074] S2. Dry the components obtained in step S1, put the components into a rotary cabinet rheometer for melting and blending, the melting temperature is 190 ° C, the rotation speed is 60 rads / min, and after blending for 15 minutes, a polymer with high melt strength is formed. Lactic acid blend;

[0075] S3. Cool the blend obtained in step S2, and use a flat plate rheometer to mold at a molding temperature of 190°C for 20 m...

Embodiment 3

[0078] The polylactic acid foam material with nano-cells of embodiment 3, comprises the component of following quality:

[0079] Polylactic acid resin 54g;

[0080] Isocyanate chain extender 3g;

[0081] Cage polysilsesquioxane (POSS) 3g.

[0082] Such as figure 1 Shown, the preparation process of the polylactic acid foam material with nano-cell of embodiment 3 is as follows:

[0083] S1: Ingredients: equipped with the following components: 54g polylactic acid resin, 3g isocyanate chain extender, 3g cage polysilsesquioxane (POSS);

[0084] S2. Dry the components obtained in step S1, put the components into a rotary cabinet rheometer for melting and blending, the melting temperature is 170 ° C, the rotation speed is 80 rads / min, and after blending for 10 minutes, a polymer with high melt strength is formed. Lactic acid blend;

[0085] S3. Cool the blend obtained in step S2, and use a flat plate rheometer to mold at a molding temperature of 200°C for 10 minutes to prepare a...

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Abstract

The invention discloses a polylactic acid foamed material having nano foam pores, which includes, by mass, 90.0-99.895% of polylactic resin, 0.1-5.0% of a chain extender, and 0.005-5.0% of filler. Theinvention also discloses a preparation method of the polylactic acid foamed material having nano foam pores. Through melt blending, the material is produced; by adding the chain extender, branching degree is increased and branching points are increased, crystallization nucleating points are increased, and rheologic character of the blend is improved and expandability of the material is improved.By adding the filler as heterogeneous nucleation points, crystallization degree and foam pore nucleation points are increased. The polylactic acid foamed material not only has high foaming rate and has nano-scale foam size. The polylactic acid foamed material is greatly improved in mechanical performance, heat insulation and electic-conductivity.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid (PLA) foam materials, and in particular relates to a polylactic acid foam material with nano cells and a preparation method thereof. Background technique [0002] In recent years, the price of petroleum has continued to increase and the ecological environment has become prominent, and the development of petroleum-based polymer materials has become more and more restricted. However, bio-based polymer materials from biological sources have received close attention from society due to their greenness. Among them, PLA is a degradable polymer synthesized from renewable resources, which has excellent mechanical properties, biocompatibility and food contact, and has become a research hotspot. PLA is completely decomposed under the action of microorganisms, water, acid, etc., and can be recycled. Widely used in various fields after processing such as extrusion, casting, blown film, injection mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L25/14C08L83/04C08K3/04C08K5/1515C08K5/29C08J9/12
CPCC08J9/0023C08J9/0028C08J9/0042C08J9/0061C08J9/0066C08J9/122C08J2203/06C08J2205/042C08J2367/04C08J2425/14C08J2483/04C08K3/04C08K5/1515C08K5/29C08K2201/003
Inventor 周洪福王向东
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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