Antioxidant gradient crosslinked polyethylene material and preparation method thereof

A technology of cross-linked polyethylene and polyethylene, applied in the field of polymer materials, can solve the problems of difficult to achieve a good balance between material cross-linking degree, oxidation resistance and mechanical properties, achieve excellent oxidation resistance, improve service life, The effect of improving wear resistance

Pending Publication Date: 2021-06-18
上海威高医疗技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although using vitamin E and controlling the distribution of vitamin E in the block is an effective means to improve the antioxidant capacity and mechanical properties of cross-linked UHMWPE, the effect of vitamin E on irradi

Method used

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  • Antioxidant gradient crosslinked polyethylene material and preparation method thereof
  • Antioxidant gradient crosslinked polyethylene material and preparation method thereof
  • Antioxidant gradient crosslinked polyethylene material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0040] The present invention also provides an antioxidative gradient crosslinked polyethylene material, including the following steps:

[0041] a) Preparing the first mixed powder and the second mixed powder; the first mixed powder is a mixed powder of polyethylene and vitamin E, the second mixed powder is a mixed powder of polyethylene and no herbic acid;

[0042] b) The first mixed powder and the second mixed powder are respectively filled into the mold, and the end of the two mixed powders is not blended; after the filling is completed, the first mixed powder layer and the second mixed powder layer are formed, two mixing There is an intersection between the powder layers;

[0043] c) The mixed powder filling into the mold is molten, and then released to obtain a blank to be irradiated;

[0044] d) A electron beam irradiated to obtain an antioxidant gradient crosslinked polyethylene material.

[0045] In the preparation method provided by the present invention, the first mixed p...

Example Embodiment

[0054] Example 1

[0055] Step (1): 100 grams of vitamin E added 1 liter acetone solvent mixed uniform, then add 100 kg of polyethylene resin powder, thoroughly mixed, 40 ° C for 14 days, to obtain the first mixed powder; add 100 grams no food acid 1 liter acetone solvent is mixed uniform, then add 100 kg of polyethylene resin powder, thoroughly mixed, 14 days at 60 ° C, resulting in a second mixed powder;

[0056] Step (2): Top the first mixed powder in the mold, the powder is added to 1 / 3 of the mold, and the second mixed powder of the same volume is then tiled in the first mixed powder upper layer.

[0057] Step (3): Place the powder mold is placed on the hot plate of the flat vulcanizer, heated to 240 ° C, pressurized to 20 MPa, maintain the temperature and pressure of the same, so that the mixture powder is melted into a block; then cool down to 120 ° C, the pressure is maintained unchanged for 1.5 hours, and then the block blank is obtained after the mold is reduced.

[0058...

Example Embodiment

[0059] Example 2

[0060] Step (1): 100 grams of vitamin E added 1 liter acetone solvent mixed uniform, then add 100 kg of polyethylene resin powder, thoroughly mixed, 40 ° C for 14 days, to obtain the first mixed powder; add 100 grams no food acid 1 liter acetone solvent is mixed uniform, then add 100 kg of polyethylene resin powder, thoroughly mixed, 14 days at 60 ° C, resulting in a second mixed powder;

[0061] Step (2): Top the first mixed powder in the mold, the powder is added to 1 / 3 of the mold, and the second mixed powder of the same volume is then tiled in the first mixed powder upper layer.

[0062] Step (3): Place the powder mold is placed on the hot plate of the flat vulcanizer, heated to 240 ° C, pressurized to 20 MPa, maintain the temperature and pressure of the same, so that the mixture powder is melted into a block; then cool down to 120 ° C, the pressure is maintained unchanged for 1.5 hours, and then the block blank is obtained after the mold is reduced.

[0063...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to an antioxidant gradient crosslinked polyethylene material and a preparation method thereof. The antioxidant gradient cross-linked polyethylene material provided by the invention is prepared from polyethylene mixture powder through mold filling, sintering, demolding and electron beam irradiation; the polyethylene mixture powder comprises first mixed powder and second mixed powder, the first mixed powder is mixed powder of polyethylene and vitamin E, and the second mixed powder is mixed powder of polyethylene and gallic acid; in the die filling process, the first mixed powder and the second mixed powder are not mixed. The distribution condition of the two antioxidants in polyethylene is controlled by utilizing different irradiation crosslinking inhibition degrees of vitamin E and gallic acid on polyethylene, so that the gradient crosslinking polyethylene material is obtained, the material is very suitable for manufacturing implants in joints, and the service lifetime of artificial joints is prolonged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an anti-oxidation gradient cross-linked polyethylene material and a preparation method thereof. Background technique [0002] Due to its excellent mechanical properties, good biocompatibility and wear resistance, ultra-high molecular weight polyethylene began to be used as a stress-bearing material for artificial joint linings in the 1960s. However, long-term friction and wear of ultra-high molecular weight polyethylene prostheses in the body will still produce a large number of wear debris with a size below a few microns, which can easily lead to osteolysis around the prosthesis, resulting in aseptic loosening and failure of the artificial joint. [0003] In the 1990s, people used radiation crosslinking technology to improve the wear resistance of ultra-high molecular weight polyethylene. However, the fatigue toughness and impact resistance of UHMWPE decre...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/28C08L23/06C08K5/1545C08K5/13
CPCC08J3/24C08J3/28C08J2323/06C08J2423/06C08K5/1545C08K5/13Y02P10/25
Inventor 沈杰殷敬华杨华伟王萍刘文涛李春明吴刚
Owner 上海威高医疗技术发展有限公司
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