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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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  • 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 irradiation cross-linking of UHMWPE The cross-linking has a certain inhibitory effect, which makes it difficult to achieve a good balance between the degree of cross-linking, oxidation resistance and mechanical properties of the material.

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

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preparation example Construction

[0040] The present invention also provides a preparation method of an anti-oxidation gradient cross-linked polyethylene material, comprising the following steps:

[0041] a) preparing a first mixed powder and a second mixed powder; the first mixed powder is a mixed powder of polyethylene and vitamin E, and the second mixed powder is a mixed powder of polyethylene and gallic acid;

[0042] b) respectively filling the first mixed powder and the second mixed powder into the mould, and the two mixed powders are not mixed; after filling, the first mixed powder layer and the second mixed powder layer are formed in the mold, and the two mixed There is an interface between the powder layers;

[0043] c) sintering the mixed powder loaded into the mold, and then demoulding to obtain a blank to be irradiated;

[0044] d) irradiating the blank to be irradiated with electron beams to obtain an anti-oxidation gradient cross-linked polyethylene material.

[0045] In the preparation method ...

Embodiment 1

[0055] Step (1): Add 100 grams of vitamin E to 1 liter of acetone solvent and mix evenly, then add 100 kilograms of polyethylene resin powder, mix thoroughly, and dry at 60°C for 14 days to obtain the first mixed powder; add 100 grams of gallic acid Mix evenly in 1 liter of acetone solvent, then add 100 kg of polyethylene resin powder, mix thoroughly, and dry at 60°C for 14 days to obtain the second mixed powder;

[0056] Step (2): spread the first mixed powder in the mold for compaction, the amount of powder added accounts for about 1 / 3 of the mold volume, and then spread the same volume of the second mixed powder on the upper layer of the first mixed powder;

[0057] Step (3): Place the powder-containing mold on the hot plate of a flat vulcanizer, heat it to 240°C, pressurize it to 20MPa, keep the temperature and pressure constant for 2 hours, so that the mixture powder is sintered into a block; then cool down to 120°C, keep the pressure constant for 1.5 hours, then lower to...

Embodiment 2

[0060] Step (1): Add 100 grams of vitamin E to 1 liter of acetone solvent and mix evenly, then add 100 kilograms of polyethylene resin powder, mix thoroughly, and dry at 60°C for 14 days to obtain the first mixed powder; add 100 grams of gallic acid Mix evenly in 1 liter of acetone solvent, then add 100 kg of polyethylene resin powder, mix thoroughly, and dry at 60°C for 14 days to obtain the second mixed powder;

[0061] Step (2): spread the first mixed powder in the mold for compaction, the amount of powder added accounts for about 1 / 3 of the mold volume, and then spread the same volume of the second mixed powder on the upper layer of the first mixed powder;

[0062] Step (3): Place the powder-containing mold on the hot plate of a flat vulcanizer, heat it to 240°C, pressurize it to 20MPa, keep the temperature and pressure constant for 2 hours, so that the mixture powder is sintered into a block; then cool down to 120°C, keep the pressure constant for 1.5 hours, then lower to...

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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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