Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing tridimensional composite polylactic acid

A composite polylactic acid and three-dimensional composite technology, applied in the field of polymer materials, can solve the problems of complex preparation process and low content rate of polylactic acid three-dimensional composite crystals, and achieve the effect of simple process

Inactive Publication Date: 2013-02-13
SHANGHAI KEYUAN BIO MATERIAL
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of low content rate of polylactic acid stereocomplex crystals prepared from high molecular weight polylactic acid and complicated preparation process, and discloses a method for preparing stereocomplex polylactic acid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing tridimensional composite polylactic acid
  • Method for preparing tridimensional composite polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 500g of dried poly-L-lactic acid, 500g of poly-D-lactic acid and 0.097g of lithium lactate evenly, put them into a twin-screw extruder under the protection of nitrogen, and melt, blend and extrude at 180-230°C to obtain stereocomposite polylactic acid SC1. The length-to-diameter ratio of the screw is L / D=40, the rotation speed is 48rpm, and the residence time is 6min.

Embodiment 2

[0022] Mix 500g of dried poly-L-lactic acid, 500g of poly-D-lactic acid and 0.043g of anhydrous lithium chloride evenly, add them into a twin-screw extruder under the protection of nitrogen, and melt, blend and extrude at 180-230°C to obtain a stereocomposite polymer. Lactate SC2. The length-to-diameter ratio of the screw is L / D=40, the rotation speed is 48rpm, and the residence time is 6min.

Embodiment 3

[0024] Mix 25g of dried poly-L-lactic acid, 25g of poly-D-lactic acid and 0.05g of lithium lactate evenly, put them into an internal mixer, melt and blend at 230°C to obtain stereocomposite polylactic acid SC3. The rotating speed is 60rpm, and the residence time is 6min.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
melting pointaaaaaaaaaa
optical purityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a tridimensional composite polylactic acid. The method is characterized by comprising the step of carrying out melt blending of poly(L-lactic acid), poly(D-lactic acid) and an ester exchange catalyst at a reaction temperature of 180 to 240 DEG C to obtain the tridimensional composite polylactic acid. A differential scanning calorimetry test proves that the tridimensional composite polylactic acid prepared by the method has tridimensional composite crystal content of 90 to 100%. The method utilizes an unreported alkali metal salt as the ester exchange catalyst, utilizes a double-screw extruder to realize direct preparation of the tridimensional composite polylactic acid having high tridimensional composite crystal content, has simple processes and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of polylactic acid, in particular to a method for preparing stereocomposite polylactic acid. Background technique [0002] With the development of the two major problems of environmental pollution and oil resource depletion, bioplastics have become the new darling of future plastics due to their advantages such as low carbon emissions, recyclability and biodegradation. Among them, polylactic acid has become the most active research and development of biodegradable polymer materials in recent years. Polylactic acid (PLA) is a biodegradable polymer material produced from renewable resources such as corn starch. Polylactic acid has excellent physical and mechanical properties and good processing properties. It is suitable for traditional processing and molding methods, and can also be blended or copolymerized with general-purpose plastics ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/06C08G63/83
Inventor 印培民侯文婷蒲文亮
Owner SHANGHAI KEYUAN BIO MATERIAL