Method for preparing meso-porous silica/polylactic acid foamed material by supercritical CO2 foaming

A foaming technology of mesoporous silica and polylactic acid, which is applied in the field of supercritical CO2 foaming to prepare mesoporous silica/polylactic acid foaming materials, can solve problems that have never occurred before, and achieve high cell density and foaming. The effect of simple foaming process and uniform cell size

Active Publication Date: 2012-01-18
弗润德力新材料宁夏股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the domestic patent technology for the preparation of polylactic acid foam materials, there has never been the application of mesoporous silica as a nucleating agent in the preparation of polylactic acid foam materials

Method used

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  • Method for preparing meso-porous silica/polylactic acid foamed material by supercritical CO2 foaming
  • Method for preparing meso-porous silica/polylactic acid foamed material by supercritical CO2 foaming
  • Method for preparing meso-porous silica/polylactic acid foamed material by supercritical CO2 foaming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The raw material components are 50g of racemic polylactic acid (PDLLA, NatureWork), 0.5g of mesoporous silica (accounting for 1% of the total weight, the pore diameter is 8.0nm, and the specific surface area is 890m 2 / g, pore volume 1.42m 3 / g), tetrahydrofuran 300g (THF, analytically pure).

[0034] Add polylactic acid and mesoporous silica to tetrahydrofuran, heat the solution to 60°C, stir thoroughly for 2 hours, add 360mL ethanol to the solution to precipitate a rough mixture; then wash the obtained rough mixture with ethanol, dry at 40°C, and use a plate The vulcanizer is molded, the temperature of the flat vulcanizer is 175°C, the pressure is 10MPa, and the holding time is 8min; the molded sample is placed in supercritical CO 2 Swell in the fluid, the swelling process takes 10 hours, the swelling temperature is 120°C, and the swelling pressure is 15Mpa; finally, the CO in the material is decompressed at a pressure relief rate of 4MPa / s. 2 Supersaturated, foamed...

Embodiment 2

[0038] The raw material components are calculated by weight ratio: 50g of racemic polylactic acid (PDLLA, NatureWork), 1.5g of mesoporous silica (accounting for 3% of the total weight, with a pore diameter of 10.0nm and a specific surface area of ​​950m 2 / g, pore volume 1.57m 3 / g), tetrahydrofuran 350g (THF, analytically pure).

[0039] Add polylactic acid and mesoporous silica to tetrahydrofuran, heat the solution to 65°C, stir thoroughly for 1.5h, add 400mL ethanol to the solution to precipitate a rough mixture; then wash the obtained rough mixture with ethanol, dry at 60°C, and use The flat vulcanizer is molded, the temperature of the flat vulcanizer is 175°C, the pressure is 10MPa, and the holding time is 7min; the molded sample is placed in supercritical CO 2 Swell in the fluid, the swelling process takes 10 hours, the swelling temperature is 122°C, and the swelling pressure is 14Mpa; finally, the CO in the material is decompressed at a pressure relief rate of 4MPa / s. ...

Embodiment 3

[0043] The raw material components are calculated by weight ratio: 50g of racemic polylactic acid (PDLLA, NatureWork), 2.6g of mesoporous silica (accounting for 5% of the total weight, with a pore diameter of 14.0nm and a specific surface area of ​​967m 2 / g, pore volume 1.72m 3 / g), tetrahydrofuran 250g (THF, analytically pure).

[0044] Add polylactic acid and mesoporous silica to tetrahydrofuran, heat the solution to 50°C, stir thoroughly for 3 hours, add 425mL ethanol to the solution to precipitate a rough mixture; then wash the obtained rough mixture with ethanol, dry at 50°C, and use a plate The vulcanizer is molded, the temperature of the flat vulcanizer is 185°C, the pressure is 12MPa, and the holding time is 6min; the molded sample is placed in supercritical CO 2 Swell in the fluid, the swelling process takes 12 hours, the swelling temperature is 126°C, and the swelling pressure is 15Mpa; finally, the CO in the material is decompressed at a pressure relief rate of 3M...

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Abstract

The invention discloses a method for preparing a meso-porous silica / polylactic acid foamed material by supercritical CO2 foaming, and the method prepares a polylactic acid foamed material by using meso-porous silica as a nucleating agent; the foaming process is simple; foams of the obtained foamed material have a uniform foam size and high density.

Description

technical field [0001] The present invention relates to a kind of supercritical CO 2 A method for preparing a mesoporous silica / polylactic acid foam material by foaming. Background technique [0002] Foamed plastic is a high polymer / gas composite foam material with superior performance. It has many excellent properties such as light weight, high impact strength, high specific strength, good heat and sound insulation, and strong hygroscopicity. But at present, many foaming materials will bring environmental problems. Polylactic acid, as a fully degradable polymer material, is more and more widely used in foaming. [0003] From a material point of view, materials suitable for foaming usually must have certain characteristics: high viscosity at low shear rates, shear thinning, and high viscoelasticity. These characteristics play a very important role in the growth and control of cells. PLA is a crystalline polymer with low melt strength, and due to its processing instability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/04C08K7/26
Inventor 陈枫戴洪湖汪文钟明强周云国吴敏杰徐峰
Owner 弗润德力新材料宁夏股份有限公司
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