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Method for preparing orientated-state polylactic acid profile

A technology of polylactic acid and orientation, which is applied in the direction of coating, etc., can solve the problems of strict requirements on the purity of polylactic acid, difficult control of rolling mill line pressure and air nozzle, and complicated actual operation, so as to overcome unsatisfactory mechanical properties, excellent mechanical properties, The effect of expanding the application field

Active Publication Date: 2017-02-22
SUZHOU SEEMINE NEBULA BIOTECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is difficult to control the line pressure of the rolling mill and the air flow nozzle, and has strict requirements on the purity of equipment, raw materials, and polylactic acid, so the actual operation is complicated

Method used

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  • Method for preparing orientated-state polylactic acid profile
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  • Method for preparing orientated-state polylactic acid profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0027] A method for preparing oriented polylactic acid profile, according to the following steps:

[0028] [1]. Vacuum-dry the L-polylactic acid fully before use.

[0029] [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.

[0030] [3]. After demoulding, the injection-molded blank is rapidly cooled by a special cooling system to make a polylactic acid blank.

[0031] [4]. Heat the extrusion mold to 180°C. After stabilization, put the embryo into the cavity of the mold and heat for 2 minutes.

[0032] [5]. 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.

[0033] [6]. After the extrusion is completed, the polylactic acid profile is rapidly cooled and quenched together with the molding cavity to obtain the fin...

Embodiment B

[0042] A method for preparing oriented polylactic acid profile, according to the following steps:

[0043] [1]. L-polylactic acid with a crystallinity of 8.5% is placed in a vacuum environment and fully dried before use.

[0044] [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.

[0045] [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.

[0046] [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.

[0047] [5]. After the heating is completed, start the equipment for forging, the forging pressure is 15MPa, and keep the pressure for 20s.

[0048] [6]. After the pressure holding is completed, q...

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Abstract

The invention discloses a method for preparing an orientated-state polylactic acid profile. The method comprises the following steps of 1, conducting injection molding on dried polylactic acid raw materials through an injection molding machine, so that a billet material is obtained, or heating and pressurizing the polylactic acid raw materials, so that the polylactic acid raw materials are made into the billet material through forging; 2, conducting oriented intensification on the billet material obtained in step 1, wherein extrusion or forging is adopted as the oriented intensification method; and 3, conducting cooling and quenching on the billet material obtained in step 2, so that after the billet material is stabilized, the profile is formed. According to the method for preparing the orientated-state polylactic acid profile, technological parameters for preparing the polylactic acid profile are controlled, so that the orientation effect of polylactic acid molecules and a crystalline region is improved to the greatest extent; and the unexpected technical effect is gained, and thus the polylactic acid profile which is excellent in mechanical performance is obtained. The orientated-state polylactic acid profile prepared through the method is stable in performance, healthy, harmless and 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 CN103540111A discloses a high-strength, high-temperature-resistant fully degradable polylactic acid sheet and its preparation method. 50%-78% polylactic acid, 10%-30% toughening component, 10%-30% The inorganic filler and 1%-3% of other additives are mixed evenly, and the blending masterbatch is prepared by using an extruder, and then the sheet is prepared by the extruder. Due to the addition of additives, this method has the problem of poor interface matching. [0004] Chinese patent CN101525812A prepares high-strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C45/00B29C71/02B29K67/00
CPCB29C45/0001B29C45/0053B29C71/02B29C2071/025B29K2067/046
Inventor 曾晨光彭芸秦小鹏杨习锋
Owner SUZHOU SEEMINE NEBULA BIOTECH CO
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