Preparation method of montmorillonoid/polylactic acid nano composite material

A nanocomposite material, polylactic acid technology, applied in the field of preparation of montmorillonite/polylactic acid nanocomposite materials, can solve the problems of low molecular weight and narrow application range of polylactic acid, and achieve simple and effective preparation methods, wide application range, and improved The effect of dispersion uniformity

Inactive Publication Date: 2013-12-18
EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN100347240C provides a method for preparing polylactic acid / montmorillonite nanocomposites by in-situ polymerization. Although this method can obtain exfoliated nanocomposites, the molecular weight of polylactic acid prepared by in-situ polymerization is low and the application range is narrow

Method used

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  • Preparation method of montmorillonoid/polylactic acid nano composite material

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Experimental program
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Effect test

Embodiment 1

[0022] The 300ml dispersion containing 20g of the modified MMT is filtered out of the zirconium balls, and the filtered dispersion is put into a 2L stainless steel stirrer with cooling water, and then 200g of PLA powder is also added to the stainless steel stirrer. After stirring at a high speed of 3000 rpm for 3 minutes, pour out the obtained mixed solution and let it rest for 30 minutes, remove the completely clear liquid in the upper layer, and put it into a drying oven for 24 hours under vacuum at 50°C. The dry mixture obtained above and 2 g of tris(2,4-di-tert-butylphenyl) phosphite were added into an internal mixer, and melt-blended at 180° C. for 3 minutes to obtain a product.

Embodiment 2

[0024] The 300ml dispersion that contains the modified MMT of 10g is filtered off the zirconium balls, and the dispersion that is filtered is put back into a 2L stainless steel stirrer with cooling water, and then the PLA powder of 200g is also added in this stainless steel stirrer, After stirring at a high speed of 3000 rpm for 10 minutes, pour out the obtained mixed solution and let it stand for 30 minutes, remove the completely clear liquid in the upper layer, and put it into a drying oven for 36 hours under vacuum at 60°C. The dry mixture obtained above and 2 g of phenylene diisodecyl phosphite were added into an internal mixer, and melt-blended at 190° C. for 10 minutes to obtain a product.

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Abstract

The invention relates to a preparation method of a montmorillonoid / polylactic acid nano composite material, comprising the following steps of: (1) filtering a modified montmorillonoid dispersing solution and adding polylactic acid into the dispersing solution; agitating for 3-10 min and standing; and removing upper-layer liquid and drying to obtain a mixture; and (2) mixing the obtained mixture with an antioxidant to be added into an internal mixer; fusing and commixing at a temperature of 180-190 DEG C for 3-10 minutes to obtain the montmorillonoid / polylactic acid nano composite material. According to the preparation method disclosed by the invention, working procedures are greatly reduced; meanwhile, the dispersing uniformity of montmorillonoid in a polymer matrix is improved; and a stripping-type structure is formed in a polylactic acid matrix by the organically-modified montmorillonoid.

Description

technical field [0001] The invention belongs to the field of preparation of polylactic acid nanocomposite materials, in particular to a preparation method of montmorillonite / polylactic acid nanocomposite materials. Background technique [0002] Polylactic acid (PLA) is one of the most promising "green materials". Polylactic acid is the only polymer based on natural materials that can be melt-processed. It has good processability and is suitable for various processing methods such as blow molding, extrusion, and injection molding. The most prominent advantage of polylactic acid is its biodegradability. After use, it can be completely degraded to generate carbon dioxide and water. At the same time, polylactic acid has excellent mechanical properties. However, due to the easy chemical and enzymatic hydrolysis of ester bonds, the mechanical properties and thermal stability of polylactic acid fibers after processing often cannot meet the needs of practical applications. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K13/06C08K9/06C08K9/04C08K3/34
Inventor 陈晓蕾王鲁民黄洪亮石建高王磊刘永利
Owner EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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