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High-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and preparation method thereof

An ultra-high molecular weight, polyethylene-based technology, applied in medical science, prosthesis, tissue regeneration, etc., can solve the problems of increasing UHMWPE melt viscosity, secondary deterioration of mechanical properties, and processing difficulties, so as to avoid post-melting processing , promote the movement of molecular chains, and the effect of good melt processability

Inactive Publication Date: 2015-10-28
安徽瑞琦塑胶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although post-melting treatment can eliminate residual free radicals, high-temperature melting reduces the crystallinity of UHMWPE, resulting in secondary deterioration of mechanical properties (Oral, E. et al. Biomaterials 2006, 27, 917-925)
In order to avoid the above problems, irradiation before molding can be used, but the introduction of crosslinking points will limit the movement of molecular chains, further increase the melt viscosity of UHMWPE, and make processing more difficult

Method used

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  • High-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and preparation method thereof
  • High-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and preparation method thereof
  • High-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of irradiation cross-linked UHMWPE: UHMWPE powder is subjected to electron beam irradiation treatment with an irradiation dose of 50kGy, and after irradiation, it is evacuated and stored at a low temperature of -10°C to prevent its oxidative degradation;

[0029] (2) Preparation of cross-linked UHMWPE and ULMWPE blend: After mechanically mixing 95% cross-linked UHMWPE and 5% ULMWPE, put them in a twin-screw extruder for melt blending and extrusion, and the extruder conveys the compression section and the melting section And the metering section temperature is set to 220 ° C, 260 ° C and 240 ° C, the host speed is set to 135 rpm, the feeding speed is 5 rpm, then the blend is forced to cool and pelletized, and at 100 ° C Drying to a moisture content not higher than 0.01% of its own weight;

[0030] (3) Vibration-shear injection molding: Vibration-shear injection molding is performed on the extruded pellets after drying. The barrel and nozzle temperatures o...

Embodiment 2

[0032] (1) Preparation of irradiation cross-linked UHMWPE: UHMWPE powder is subjected to electron beam irradiation treatment with an irradiation dose of 50kGy, and after irradiation, it is evacuated and stored at a low temperature of -10°C to prevent its oxidative degradation;

[0033](2) Preparation of cross-linked UHMWPE and ULMWPE blend: 90% cross-linked UHMWPE and 10% ULMWPE are mechanically mixed, then placed in a twin-screw extruder for melt blending and extrusion, and the extruder conveys the compression section and the melting section And the metering section temperature is set to 230 ℃, 240 ℃ and 245 ℃, the speed of the main engine is set to 137 rpm, the feeding speed is 4.7 rpm, then the blend is forced to cool and pelletized, and at 100 ℃ Drying to a moisture content not higher than 0.01% of its own weight;

[0034] (3) Vibration-shear injection molding: Vibration-shear injection molding is performed on the above-mentioned dried extruded pellets. The barrel and nozz...

Embodiment 3

[0036] (1) Preparation of UHMWPE and ULMWPE blends: After mechanically mixing 90% UHMWPE and 10% ULMWPE, they are placed in a twin-screw extruder for melt blending and extrusion. Set at 230°C, 250°C and 240°C, the speed of the host machine was set at 130 rpm, and the feeding speed was 4 rpm, then the blend was forced to cool and pelletized, and dried at 100°C until it contained The amount of water is not more than 0.01% of its own weight;

[0037] (2) Vibration-shear injection molding: Vibration-shear injection molding is performed on the above-mentioned dried extruded pellets. The barrel and nozzle temperatures of the injection molding machine are set at 250°C and 240°C, respectively, and the temperature of the hot runner is set at 250°C. , and the mold temperature was set to 40 °C.

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Abstract

The invention relates to a high-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and a preparation method thereof. The high wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material is prepared by melt blending and injection moulding of ultra-high molecular weight polyethylene (UHMWPE) and ultra-low molecular weight polyethylene (ULMWPE). The preparation method comprises the following steps of 1 irradiation-crosslinking UHMWPE preparation; 2 crosslinking UHMWPE / ULMWPE blend preparation; 3 vibrating-shearing injection moulding. According to the high-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and the preparation method thereof, the wear-resisting performance of the UHMWPE is improved greatly by using the irradiation crosslinking technology, the melt viscosity of the crosslinking UHMWPE is reduced greatly by adding minute quantity of ULMWPE, and the melt machinability of the crosslinking UHMWPE is guaranteed; in the pressure maintaining stage of injection moulding, shearing flow field is introduced, a large number of reinforcing orientation lamella structures are induced to be generated, the mechanical performance of the material is improved greatly, residual free radical caused by irradiation in the UHMWPE is removed effectively, the oxidation stability of the material is improved, and the material is suitable for be used as boundary friction material of an artificial joint and is especially suitable for total knee prosthesis with higher demand of mechanical performance.

Description

technical field [0001] The invention belongs to the field of biomedical polymer materials, and relates to a high-wear-resistant, high-strength, ultra-high molecular weight polyethylene-based material and a preparation method thereof. Background technique [0002] Osteolysis caused by wear is an important factor affecting the life of ultra-high molecular weight polyethylene (UHMWPE) artificial joint materials (Bozic, K.J. et al. The Journal of Bone & Joint Surgery 2009, 91, 128-133; Kurtz, S. et al. Biomaterials 2000, 21, 283-291; Harris, W.H. Clinical Orthopedics & Related Research 1995, 311, 46-53). In order to improve the wear resistance, radiation crosslinking is usually used to reduce the plasticity of the material to reduce the wear rate, but this will lead to the loss of mechanical properties (Muratoglu, O.K. et al. Biomaterials 1999, 20, 1463-1470; Oonishi, H. et al. Journal of Biomedical Materials Research 2001, 58, 167-171). Deteriorated mechanical properties will...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08J3/24B29B9/06B29C45/77B29B13/06B29B13/08A61L27/48A61L27/26A61L27/50
CPCA61L27/26A61L27/48A61L2430/24B29C2945/76063B29C2945/76862C08J2323/06C08L23/06C08L2203/02C08L2205/025C08L2207/06C08L2207/068C08L2312/06
Inventor 徐家壮黄妍斐李忠明
Owner 安徽瑞琦塑胶科技有限公司
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