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A kind of preparation method of oriented polylactic acid profile

A polylactic acid and orientation technology, applied in the field of producing oriented polylactic acid profiles, can solve problems such as poor interface matching, achieve low equipment requirements, excellent mechanical properties, and expand the effect of practical application fields.

Active Publication Date: 2018-08-17
SUZHOU SEEMINE NEBULA BIOTECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problem of poor interface matching due to the addition of additives

Method used

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  • A kind of preparation method of oriented polylactic acid profile
  • A kind of preparation method of oriented polylactic acid profile
  • A kind of preparation method of oriented polylactic acid profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0026] A preparation method of oriented polylactic acid profile, according to the following steps:

[0027] [1]. Vacuum-dry the L-polylactic acid fully before use.

[0028] [2]. After setting all the parameters of the injection molding machine, preheat it; after the preheating is completed, add the dried polylactic acid to start the injection molding process.

[0029] [3]. Heat the extrusion mold to 180°C. After stabilization, put the product of step [2] into the cavity of the mold while it is still hot.

[0030] [4]. Start the equipment and extrude the obtained product into the molding cavity preheated to 120°C to prepare polylactic acid profiles in an oriented state.

[0031] [5]. 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 vis...

Embodiment B

[0040] A preparation method of oriented polylactic acid profile, according to the following steps:

[0041] [1]. L-polylactic acid with a crystallinity of 8.5% is placed in a vacuum environment and fully dried before use.

[0042] [2]. Heat the polylactic acid 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.

[0043] [3]. Heat the polylactic acid profile forming mold to 180°C and keep the temperature constant, and put the obtained product into the mold while it is still hot.

[0044] [4]. Start the equipment for forging, the forging pressure is 15MPa, and keep the pressure for 20s.

[0045] [5]. After the pressure holding is completed, quickly quench the polylactic acid profile under the pressure holding condition, and the quenching time is 10 minutes.

[0046] [6]. After the quenching is completed, the polylactic acid profile can ...

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Abstract

The invention discloses a method for preparing an oriented polylactic acid profile, which comprises the following steps: 1) Preliminarily molding the dried polylactic acid raw material, and then strengthening the orientation, and the orientation strengthening method includes re-extrusion or forging; 2) The product obtained in step 1) is cooled and quenched, and the oriented polylactic acid profile is formed after the product is stabilized. By controlling the process parameters for preparing polylactic acid profiles, the orientation of polylactic acid molecules and crystal regions is improved to the greatest extent, and unexpected technical effects are achieved, thereby obtaining polylactic acid profiles with excellent mechanical properties. The oriented polylactic acid profile prepared by the invention has stable performance, is healthy and harmless, and has good biocompatibility.

Description

technical field [0001] The invention relates to a process for producing organic polymer profiles, in particular to a method for producing oriented polylactic acid profiles. Background technique [0002] As a degradable material, polylactic acid has good tissue compatibility, so it is widely used in medicine, but the low strength of conventional polylactic acid materials restricts its application in medicine, especially in orthopedics. [0003] Chinese patent CN101525812A prepares high-strength polylactic acid by spinning method, using polylactic acid slices as raw material, using high-speed air flow nozzle to stretch, improving the orientation degree of continuous filaments, so as to obtain sufficient fiber strength; using higher than 100N / mm The rolling mill line pressure and the roll temperature of 125 ° C ~ 157 ° C to obtain the best bonding strength. This method is difficult to control the line pressure of the rolling mill and the air flow nozzle, and has strict require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/30B29C43/16B29C43/58B29C71/02B29K67/00
CPCB29C48/001B29C48/022B29C71/02B29C2043/5808B29C2043/5816B29C2071/025B29K2067/046
Inventor 曾晨光彭芸秦小鹏杨习锋
Owner SUZHOU SEEMINE NEBULA BIOTECH CO
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