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A method for preparing oriented polylactic acid profiles

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

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 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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  • A method for preparing oriented polylactic acid profiles
  • A method for preparing oriented polylactic acid profiles
  • A method for preparing oriented polylactic acid profiles

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 oriented polylactic acid profiles, which comprises the following steps: 1) Injecting dried polylactic acid raw materials through an injection molding machine to make blanks or heating and pressing polylactic acid raw materials to form blanks by forging ; 2) performing orientation strengthening on the embryo material obtained in step 1), and the orientation strengthening method is extrusion or forging; 3) cooling and quenching the embryo material obtained in step 2), and forming a profile after the embryo material 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 properties, 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 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 Patents(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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