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Application of polylactic acid blank

A technology for polylactic acid and lactic acid profiles, applied in coating and other directions, can solve problems such as unfavorable large-scale production, large molecular weight loss, harsh process conditions, etc., to improve crystallinity and comprehensive mechanical properties, speed up crystallization rate, and biocompatibility. good effect

Active Publication Date: 2017-05-31
SUZHOU SEEMINE NEBULA BIOTECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time to process, has a large loss of molecular weight, requires high equipment, and costs too much, which is not conducive to large-scale production.
[0006] To sum up, the existing methods to improve the crystallinity of polylactic acid are either accompanied by the use of additives, or the process conditions are harsh, and the production energy consumption is large

Method used

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  • Application of polylactic acid blank
  • Application of polylactic acid blank
  • Application of polylactic acid blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polylactic acid is processed into a blank by an injection molding machine or a screw extruder, and the extrusion mold is heated to 180°C. After stabilization, the blank is placed in the cavity of the mold and heated for 2 minutes. After the heating is completed, start the equipment to extrude the blank material into the molding cavity preheated to 120°C to prepare polylactic acid profiles in an oriented state. After the extrusion is completed, the polylactic acid profile is rapidly cooled and quenched together with the molding cavity to obtain the final polylactic acid profile. Under the same conditions as other production conditions, polylactic acid with a specific rotation of -150° to -160° and a viscosity of 4dL / g was used as the raw material to adjust the relevant parameters in the production. For specific adjustment parameters, see Table 1 below:

[0025]

[0026] Table 2 carries out the result of flexural strength test (the average flexural strength of 7 sa...

Embodiment B

[0029] A method for preparing oriented polylactic acid profile, according to the following steps:

[0030] [1]. L-polylactic acid with a crystallinity of 8.5% is placed in a vacuum environment and fully dried before use.

[0031] [2]. Heat the embryo material processing mold to 200°C and keep the temperature constant. After the preheating is completed, put the polylactic acid particles into the mold and heat up and pressurize in a vacuum environment.

[0032] [3]. After the polylactic acid is heated in the mold for 3 minutes, forging is carried out. The forging pressure is 10 MPa and the time is 3 minutes to form a blank.

[0033] [4]. Heat the polylactic acid profile forming mold to 180°C and keep the temperature constant, then put the embryo into the mold and heat for 3 minutes.

[0034] [5]. After the heating is completed, start the equipment for forging, the forging pressure is 15MPa, and keep the pressure for 20s.

[0035] [6]. After the pressure holding is completed, q...

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PUM

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Abstract

The invention relates to application of a polylactic acid blank. According to the application, levogyration polylactic acid granules of a low crystallization degree are made into a blank by using a common method, an orientated polylactic acid profile is further prepared in an orientated intensification manner, the specific rotation of the orientated polylactic acid profile is minus 155 DEG C to minus 160 DEG C, the orientated polylactic acid profile has crystal granule shapes of lamellae, extended chain crystal or shish-kebab, and is of a microcosmic structure orientated in an axial manner and arranged in a linear manner. The orientated polylactic acid profile made of the polylactic acid blank has the characteristics of being good in comprehensive mechanical property, high in biocompatibility, and the like.

Description

technical field [0001] The present invention relates to the use of a low crystallinity L-polylactic acid, especially the use of a polylactic acid blank. Background technique [0002] Polylactic acid is a biodegradable polymer prepared by chemical synthesis using renewable plant resources as raw materials. It gets rid of the dependence on petroleum resources and can be completely degraded into CO 2 and H 2 O. With its good biocompatibility, excellent strength and modulus, it is widely used in many fields such as biomedicine, product packaging, electronic appliances and agricultural mulching films. However, due to the poor crystallization ability of polylactic acid, the crystallinity of the material prepared by the usual processing method is very low, and the crystal size generated is large, resulting in poor toughness of polylactic acid material, which greatly limits the wider application of polylactic acid material. [0003] At present, the methods to improve the crystall...

Claims

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Application Information

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IPC IPC(8): C08L67/04B29C45/00B29C43/16B29C71/02
Inventor 曾晨光彭芸秦小鹏杨习锋
Owner SUZHOU SEEMINE NEBULA BIOTECH CO
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