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Process for microwave radiation in-situ preparation of poly-lactic acid/montmorillonite nano composite materials

A nanocomposite material and a technology for preparing polylactic acid, which is applied in the field of preparation of polylactic acid/montmorillonite nanocomposite materials, can solve the problems of high brittleness of polylactic acid materials, limitations, and poor mechanical properties of products, so as to reduce energy consumption, The effect of reducing production cost and shortening reaction time

Inactive Publication Date: 2006-12-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high brittleness of the polylactic acid material itself, the mechanical properties of the product are not good, and it is limited in practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0006] Specific implementation mode 1: This embodiment prepares polylactic acid / montmorillonite nanocomposites according to the following steps: a. Place lactide and nano-montmorillonite in a certain proportion in a conical flask with a capacity of 50-1000mL. ℃ melting, wherein the amount of nano-montmorillonite added is 0.1% to 2.5% of the mass of lactide; b. Maintain the melting temperature and stir mechanically at 1200rpm for 30 to 60 minutes; c. Add a catalyst to control the lactide and catalyst The molar ratio is 500 / 1~1000 / 1, continue to stir for 10~20min; d, stop stirring, react in the microwave field, wherein: the radiation power is 90W, the polymerization time is 2~5min, when the temperature rises to 200℃ , by controlling the microwave power to ensure a constant temperature of 200°C, and polymerizing for 5-10 minutes, the polylactic acid / nano-montmorillonite composite material was obtained.

[0007] In this embodiment, polylactic acid / montmorillonite composite materia...

specific Embodiment approach 2

[0010] Specific embodiment two: Take 20g of lactide and place it in a 50mL Erlenmeyer flask, add 0.1g of nano-montmorillonite DK1N, melt in an oil bath at 130°C, and stir mechanically for 30min. Add 2.4 ml of stannous octoate / toluene solution containing 0.096 g of stannous octoate, and stir for another 10 min. Put the Erlenmeyer flask into the microwave field, react at 90W radiation power for 2.5min, control the microwave output power when the system temperature is 200°C, keep the temperature constant at 200°C for 5min, and obtain the polylactic acid / nano-montmorillonite composite material.

specific Embodiment approach 3

[0011] Specific embodiment three: Take 20g of lactide and place it in a 50mL Erlenmeyer flask, add 0.2g of nano-montmorillonite Dk2, melt in an oil bath at 130°C, and mechanically stir for 45min. Add 0.038 g of stannous chloride, and stir for another 10 min. Put the Erlenmeyer flask into the microwave field, react at 90W radiation power for 3.5min, control the microwave output power when the system temperature is 200°C, keep the temperature constant at 200°C for 6min, and obtain the polylactic acid / nano-montmorillonite composite material.

[0012] Embodiment 4: 20g of lactide is placed in a 50mL Erlenmeyer flask, 0.2g of nano-montmorillonite DK2 and 0.2g of nano-montmorillonite DK5 are added, melted in an oil bath at 130°C, and mechanically stirred for 45 minutes. Add 0.038g of stannous chloride and 0.035g of TSA, and stir for another 10min. Put the Erlenmeyer flask into the microwave field, react at 90W radiation power for 3.5min, control the microwave output power when the ...

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Abstract

The invention relates the maser radiation method for polylactic acid / montmorillonite nanometer composite material. The method has the advantages of short reaction time and low energy consumption. The method comprises the following steps: 1 mixing the lactide and montmorillonite in 50-1000ml conical flask at 130Deg.C; 2 keeping the temperature, mechanical stirring for 30-60 min; 3 adding catalyst, stirring for 10-20 min; 4 stopping stirring, keeping them in microwave field. The invention has the advantages of low energy consumption, low cost, and simple technology.

Description

technical field [0001] The invention relates to a preparation method of polylactic acid / montmorillonite nano composite material. Background technique [0002] Polylactic acid is a polymer material with good biocompatibility and biodegradability. It is an environmentally friendly new material and can be widely used in environmental protection, medicine and other fields. At present, polylactic acid with high molecular weight and high purity is mostly synthesized by lactide ring-opening polymerization. However, due to the high brittleness of the polylactic acid material itself, the mechanical properties of the product are not good, so it is limited in practical application. Therefore, how to modify polylactic acid materials to make them more widely used has become a key issue in the production of polylactic acid materials. There are many ways to modify polylactic acid, such as copolymerization with polyethylene glycol, blending with starch, etc. At present, the emerging nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/34C08G63/08C08G63/78
Inventor 王鹏张英民李悦雷海芬
Owner HARBIN INST OF TECH