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Bidirectional stretching polylactic acid / montmorillonoid, and preparation method and application thereof

A biaxially stretched, montmorillonite technology, used in transportation and packaging, sustainable manufacturing/processing, flexible coverings, etc., can solve problems such as short shelf life of barrier properties, and achieve excellent performance, good degradability and reproducibility. The effect of improving stretchability and barrier properties

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of food packaging, due to the high permeability of polylactic acid to oxygen, it is only suitable for food packaging that does not require high barrier properties and has a relatively short shelf life.

Method used

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  • Bidirectional stretching polylactic acid / montmorillonoid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]100 parts of polylactic acid, plus 3 parts of inorganic montmorillonite, were dried in a vacuum oven for 8 hours, and then put into high-speed stirring for 2 minutes together with 1.5 parts of polyethylene glycol (PEG). Put it into the extruder to granulate, set the temperature of each section from the barrel to the head at 180-190-190-190-190-195°C, and the screw speed at 350rpm. After granulation, the granules were dried in a vacuum oven at 80° C. for 10 hours. A tape casting machine is used for casting. The temperature of each section of the casting machine barrel from the hopper to the die head is 175-170-170-180-180° C., and the screw speed is 8.5 rpm. The sheet obtained by casting was cut into square pieces of 9.3×9.3 cm, and stretched in a bidirectional stretching machine to prepare a BOPLA film. The temperature of the stretching furnace was 75°C, and longitudinal stretching was performed first, with a stretching ratio of 3.5. Then carry out transverse stretching...

Embodiment 2

[0037] Other conditions are the same as in Example 1, but replace the inorganic montmorillonite with 3 parts of organically modified montmorillonite A. The oxygen permeability test results are shown in Table 1.

Embodiment 3

[0039] Other conditions are the same as in Example 1, but 3 parts of organically modified montmorillonite B is used instead of inorganic montmorillonite, and no compatibilizer is added. The oxygen permeability test results are shown in Table 1.

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PUM

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Abstract

The invention provides a bidirectional stretching polylactic acid / montmorillonoid, and a preparation method and application thereof. The invention composite membrane of the invention comprises a mixture of 100 weight parts of polylactic acid and 1-10 weight parts of montmorillonoid, is prepared by a bidirectional stretching method and has a thickness of 10-100 mum. The composite membrane of the invention has low preparation cost, excellent barrier property and good biodegradability, and can be applied to the filed of package having high demand on oxygen permeability.

Description

technical field [0001] The present invention relates to a polylactic acid composition, more specifically, the present invention relates to a biodegradable polylactic acid film and its preparation method and application. Background technique [0002] With the improvement of industrialization, the amount of plastic film is increasing. Petroleum and natural gas as raw materials, polyethylene and polypropylene are the main raw materials of plastic film. These materials are discarded in nature and cannot be degraded, which will cause serious "white pollution" ". And along with the increasing shortage of petroleum resources, the price of petroleum keeps rising, and the cost of such raw materials also keeps rising. [0003] In order to solve these series of problems, a polylactic acid (polylactic acid, PLA) plant plastic made by biotechnology came into being. Polylactic acid is made from lactic acid obtained by fermentation of corn or potato starch as the basic raw material, thro...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K3/34C08K9/04B29C55/12B65D65/38
CPCY02W90/10
Inventor 杨庆泉张师军李杰王小兰吕明福高达利张丽英刘涛刘建叶张浩尹华邵静波邹浩吕芸徐萌陈力
Owner CHINA PETROLEUM & CHEM CORP
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