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Preparation method for oriented-state polylactic acid section bar

A polylactic acid and orientation technology, which is 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 improve the effect of orientation

Active Publication Date: 2017-02-15
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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  • Preparation method for oriented-state polylactic acid section bar
  • Preparation method for oriented-state polylactic acid section bar
  • Preparation method for oriented-state polylactic acid section bar

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 molding 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 preparation method for an oriented-state polylactic acid section bar. The preparation method comprises the following steps of: 1) preliminarily forming dried polylactic acid raw materials, and carrying out an orientated strengthening method which comprises re-extruding for forging; and 2) cooling and quenching a product obtained in the step 1), and forming the oriented-state polylactic acid section bar after the product is stabilized. By controlling process parameters of preparing the polylactic acid section bar, orientated effect of polylactic acid molecules and a crystalline region is improved to the greatest extent, and unexpected technical effects are obtained, so that the polylactic acid section bar with excellent mechanical property is obtained. The polylactic acid section bar prepared by the preparation method is stable in performance, is healthy and harmless, and is very good in 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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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