Polylactic acid foamed material having nano foam pores and preparation method thereof

A foam material, polylactic acid technology, applied in the field of polylactic acid foam material, can solve the problems of increased cell size, cell merging, unfavorable PLA nanofoam preparation, etc. Effect of Foam Density

Active Publication Date: 2019-01-29
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 coeffic

Method used

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  • Polylactic acid foamed material having nano foam pores and preparation method thereof
  • Polylactic acid foamed material having nano foam pores and preparation method thereof
  • Polylactic acid foamed material having nano foam pores 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] like 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 190°C...

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] like 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 minu...

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] like 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 sa...

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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

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Claims

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Application Information

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Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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