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Method for preparing Nano composite material of montmorillonite modified by plasticized poly lactic acid / lanthana

A technology of nanocomposite material and plasticized polylactic acid, which is applied in the field of preparation of polylactic acid nanocomposite material, can solve the problems of low compatibility between montmorillonite and polylactic acid, small improvement of material flexibility, unsuitable for industrial production, etc. The effect of improving compatibility, increasing flexibility, increasing tensile strength and flexural strength

Inactive Publication Date: 2008-09-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that existing methods for preparing polylactic acid / montmorillonite nanocomposites have complex processes, low compatibility between montmorillonite and polylactic acid, little improvement in material flexibility and unsuitability for industrial production , providing a preparation method of plasticized polylactic acid / lanthanum oxide modified montmorillonite nanocomposite

Method used

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  • Method for preparing Nano composite material of montmorillonite modified by plasticized poly lactic acid / lanthana
  • Method for preparing Nano composite material of montmorillonite modified by plasticized poly lactic acid / lanthana
  • Method for preparing Nano composite material of montmorillonite modified by plasticized poly lactic acid / lanthana

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specific Embodiment approach 1

[0009] Specific embodiment one: the steps of the preparation method of the plasticized polylactic acid / lanthanum oxide modified montmorillonite nano-composite material in this embodiment are as follows: (1) the polylactic acid is pulverized and passed through a 40-mesh sieve to obtain polylactic acid particles; (2) ) vacuum drying the polylactic acid particles, nano-montmorillonite and lanthanum oxide at 65-75°C for 3-5 hours; (3) drying the dried nano-montmorillonite and lanthanum oxide in a mass ratio of 40-60:1 Mix in a high-speed mixer at 65-75°C and 800rpm for 5-15 minutes to obtain lanthanum oxide modified montmorillonite; (4) mix polylactic acid particles, lanthanum oxide-modified montmorillonite and plasticizer at 55-65°C, Mix in the high-speed mixer of 800rpm 5~15min, wherein the percentage by weight of each component is: polylactic acid particle 75~85%, lanthanum oxide modified montmorillonite 0.5~5%, plasticizer 10~20%; (5 ) adding the mixture obtained in step (4) t...

specific Embodiment approach 2

[0010] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step (2), the polylactic acid particles, nano-montmorillonite and lanthanum oxide were vacuum-dried at 70° C. for 4 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio of nano-montmorillonite to lanthanum oxide in step (3) is 41-59:1. Others are the same as in the first embodiment.

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Abstract

This invention discloses a method for preparing plasticized poly (lactic acid) / lanthanum oxide modified montmorillonite nanocomposite. The method solves the problems of complex process, low compatibility between montmorillonite and poly (lactic acid), low flexibility and uneasy industrialization faced by the present technique. The method comprises: vacuum-drying poly (lactic acid) granules, nanoscale montmorillonite and lanthanum oxide, mixing lanthanum oxide and nanoscale montmorillonite to obtain lanthanum oxide-modified nanoscale montmorillonite, mixing poly (lactic acid) granules, lanthanum oxide-modified nanoscale montmorillonite and plasticizer, and extruding by a screw extruder to obtain plasticized poly (lactic acid) / lanthanum oxide modified montmorillonite nanocomposite. The method is simple and suitable for industrialization, and can improve the compatibility between montmorillonite and poly (lactic acid) matrix, and the flexibility of poly (lactic acid) material (elongation at break = 213%).

Description

technical field [0001] The invention relates to a preparation method of a polymer material, in particular to a preparation method of a polylactic acid nanocomposite material. Background technique [0002] Polylactic acid (PLA) is a polymer material, which is a polymer formed by dehydration condensation between lactic acid molecules. The raw materials for the production of polylactic acid are renewable crops, which makes polylactic acid have excellent biocompatibility and biodegradability. It is recognized as a green and pollution-free material, and it is also one of the most promising polymer materials. It has been widely used in medical and packaging materials and other fields. [0003] However, pure polylactic acid materials are brittle, weak in strength, poor in flexibility, and poor in thermal stability, which restrict the wider application of polylactic acid. The emergence of these problems has led people to study the modification of polylactic acid materials to impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/02B29C47/38C08K3/34B29C48/395
CPCB29C2947/92704B29C2947/92561B29C2947/9259B29C47/0004B29C48/022B29C2948/92561B29C2948/9259B29C2948/92704
Inventor 王鹏雷海芬张英民袁维波
Owner HARBIN INST OF TECH