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Irradiation crosslinked polyethylene blending material for artificial joints and preparation method thereof

A technology of cross-linked polyethylene and artificial joints, applied in medical science, prosthesis, etc., can solve problems such as inability to process, and achieve the effect of easy maintenance of orientation and increased impact strength

Active Publication Date: 2013-09-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the vibration injection molding process, further increasing the relative content of UHMWPE will lead to the inability to process

Method used

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  • Irradiation crosslinked polyethylene blending material for artificial joints and preparation method thereof
  • Irradiation crosslinked polyethylene blending material for artificial joints and preparation method thereof
  • Irradiation crosslinked polyethylene blending material for artificial joints and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Preparation of irradiation cross-linked UHMWPE: UHMWPE powder was irradiated with electron beams in the air, the irradiation dose was selected as 30 kGy, and then the irradiated samples were placed under nitrogen protection to prevent oxidative degradation .

[0031] (2) Preparation of LMWPE masterbatch: Mechanically mix unirradiated ultra-high molecular weight polyethylene powder and low molecular weight polyethylene at a mass ratio of 1:49, add xylene solution and blend until a homogeneous transparent solution is formed , and then kept stirring at 135 °C for 60 min. The obtained solution was injected into ethanol at room temperature, and the volume of ethanol was 3 times that of the solution, so that the UHMWPE / LMWPE blend containing 2% UHMWPE was precipitated, then filtered, and the filtrate was dried at 100 ° C for 12 hours;

[0032] (3) Preparation of irradiation cross-linked UHMWPE / LMWPE blend: After mechanically mixing the irradiated UHMWPE and LMWPE masterb...

Embodiment 2

[0035] (1) Preparation of irradiation cross-linked UHMWPE: UHMWPE powder was irradiated with electron beams in air, the irradiation dose was selected as 40 kGy, and then the irradiated samples were placed under nitrogen protection to prevent oxidative degradation .

[0036] (2) Preparation of LMWPE masterbatch: Mechanically mix unirradiated ultra-high molecular weight polyethylene powder and low molecular weight polyethylene at a mass ratio of 1:49, add xylene solution and blend until a homogeneous transparent solution is formed , and then kept stirring at 140 °C for 70 min. The obtained solution was injected into ethanol at room temperature, and the volume of ethanol was 3 times that of the solution, so that the UHMWPE / LMWPE blend containing 2% UHMWPE was precipitated, then filtered, and the filtrate was dried at 100 ° C for 12 hours;

[0037] (3) Preparation of irradiation cross-linked UHMWPE / LMWPE blend: After mechanically mixing the irradiated UHMWPE and LMWPE masterbatch...

Embodiment 3

[0040] (1) Preparation of irradiation cross-linked UHMWPE: UHMWPE powder was irradiated with electron beams in air, the irradiation dose was selected as 100 kGy, and then the irradiated samples were placed under nitrogen protection to prevent oxidative degradation .

[0041] (2) Preparation of LMWPE masterbatch: Mechanically mix unirradiated ultra-high molecular weight polyethylene powder and low molecular weight polyethylene at a mass ratio of 1:49, add xylene solution and blend until a homogeneous transparent solution is formed , and then kept stirring at 140 °C for 60 min. The obtained solution was injected into ethanol at room temperature, and the volume of ethanol was 3 times that of the solution, so that the UHMWPE / LMWPE blend containing 2% UHMWPE was precipitated, then filtered, and the filtrate was dried at 100 ° C for 12 hours;

[0042] (3) Preparation of irradiation cross-linked UHMWPE / LMWPE blend: After mechanically mixing the irradiated UHMWPE and LMWPE masterbatc...

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Abstract

The invention provides an irradiation crosslinked polyethylene blending self-reinforcing material for artificial joints and a preparation method thereof. The polyethylene blending material for artificial joints is prepared by blending low molecular weight polyethylene (LMWPE) and irradiation crosslinked ultrahigh molecular weight polyethylene (UHMWPE). The preparation method comprises the following steps: (1) preparing irradiation crosslinked UHMWPE, (2) preparing LMWPE master batch, (3) preparing irradiation crosslinked UHMWPE / LMWPE blending material, and (4) vibration injection molding. The irradiation crosslinked polyethylene blending self-reinforcing material for artificial joints has the advantages that the relative content of UHMWPE in polyethylene blend is improved to the maximum extent during the process of vibration injection molding and the excellent performance is reserved, a shish-kebab self-reinforcing structure is formed in the inner part due to vibration injection molding, and tensile property, impact strength and wear-resisting property are improved remarkably. Therefore, the irradiation crosslinked polyethylene blending self-reinforcing material is suitable for joint prosthesis implant material.

Description

technical field [0001] The invention belongs to the field of biomedical polymer materials. Specifically, the invention relates to a radiation cross-linked polyethylene blend material for artificial joints and a preparation method thereof. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE), as an artificial joint implant material, has been successfully used in hip and knee replacements since its introduction in the 1960s. The key factors affecting the performance and service life of artificial joint implant materials are wear resistance, oxidation stability and mechanical properties. After years of research at home and abroad, great progress has been made in improving wear resistance and oxidation stability. Specifically, wear resistance can be improved by irradiation cross-linking technology. After high-dose irradiation treatment of UHMWPE artificial joint materials, the wear rate decreased from unirradiated -6.9 ± 0.6 mg / MC to -1.4 ± 0.4 mg / M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08J3/28C08J3/24C08J3/22B29C47/92B29C45/76A61L27/26B29C48/92
CPCB29C48/92
Inventor 李忠明黄妍斐雷军徐玲钟淦基
Owner SICHUAN UNIV
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