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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 and uniform cell density The effect of simple cell size and foaming process

Active Publication Date: 2013-07-31
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 size is 8.0nm, and the specific surface area is 890m). 2 / g, hole volume 1.42m 3 / g), 300 g of tetrahydrofuran (THF, analytical grade).

[0034] The polylactic acid and mesoporous silica were added to tetrahydrofuran, the solution was heated to 60 °C, stirred thoroughly for 2 h, and 360 mL of ethanol was added to the solution to precipitate a crude mixture; the obtained crude mixture was washed with ethanol, dried at 40 °C, and used a flat plate. The vulcanizer was molded, the temperature of the flat vulcanizer was 175 °C, the pressure was 10 MPa, and the pressure holding time was 8 min; the molded sample was placed in a supercritical state of CO. 2 Swelling in the fluid, the swelling time is 10h, the swelling temperature is 120°C, and the swelling pressure is 15Mpa; finally, the CO in the material is released by...

Embodiment 2

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

[0039] The polylactic acid and mesoporous silica were added to tetrahydrofuran, the solution was heated to 65°C, fully stirred for 1.5 h, and 400 mL of ethanol was added to the solution to precipitate a crude mixture; the obtained crude mixture was washed with ethanol, dried at 60°C, and used The flat vulcanizer was used for compression molding. The temperature of the flat vulcanizer was 175 °C, the pressure was 10 MPa, and the pressure holding time was 7 min; the molded sample was placed in a supercritical state of CO. 2 Swelling in the fluid, the swelling time is 10h, the swelling temperature is 122°C, and the swelling pressure is 14Mpa; finally, the CO in the material ...

Embodiment 3

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

[0044] Polylactic acid and mesoporous silica were added to tetrahydrofuran, the solution was heated to 50 °C, stirred thoroughly for 3 h, and 425 mL of ethanol was added to the solution to precipitate a crude mixture; then the obtained crude mixture was washed with ethanol, dried at 50 °C, and used a flat plate The vulcanizer was used for compression molding. The temperature of the flat vulcanizer was 185 °C, the pressure was 12 MPa, and the pressure holding time was 6 min; the molded sample was placed in a supercritical state of CO. 2 Swelling in the fluid, the swelling time is 12h, the swelling temperature is 126°C, and the swelling pressure is 15Mpa; finally, the CO in...

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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 foaming a mesoporous silica / polylactic acid foam material. Background technique [0002] Foamed foam is a kind of high polymer / gas composite foam material with superior performance, which has many excellent properties such as light weight, high impact strength, high specific strength, good heat and sound insulation, and strong moisture absorption. However, many foaming materials currently bring environmental problems. As a completely degradable polymer material, polylactic acid is more and more widely used in foaming. [0003] From a material standpoint, materials suitable for foaming generally must possess certain properties: high viscosity at low shear rates, shear thinning, high viscoelasticity. These properties play a very important role in cell growth and control. PLA is a crystalline polymer with low melt strength, and due to the instability of its processing (such as t...

Claims

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Application Information

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Patent Type & Authority Patents(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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