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Antioxidant cross-linked polymer and preparation method thereof

A cross-linked polymer and anti-oxidation technology, which is applied in the field of materials science, can solve the problems of inhibiting the cross-linking degree of polyethylene, and achieve the effects of strong anti-oxidation ability, excellent wear resistance and long expected service life

Active Publication Date: 2012-07-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of vitamin E can improve the oxidative stability of cross-linked polyethylene, but it will inhibit the increase of the degree of cross-linking of polyethylene

Method used

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  • Antioxidant cross-linked polymer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1). Add 50 grams of caffeic acid into 1 liter of ethanol solvent and mix evenly, then add 500 kilograms of polyethylene resin powder, mix thoroughly, and dry at 80° C. for 5 days to obtain the mixture powder;

[0031]Step (2). Put the mixture powder in the mold and place it on the hot plate of the flat vulcanizer, heat it to 180°C, pressurize it to 50 MPa, and make the mixture powder sinter into a block; then cool down to 110°C and keep The pressure remains unchanged for 72 hours, and then lowered to normal temperature, and a block blank is obtained after demoulding;

[0032] Step (3). At room temperature, irradiate the block blank under a 3MeV high-energy electron beam, each time obtaining an irradiation dose of 0.1 Mrad, and the total irradiation dose is 2.5 Mrad, and the irradiation dose is measured by a standard irradiated chromogenic film ; Obtain the anti-oxidation cross-linked polymer after irradiation, denoted as sample A.

[0033] Sample A is a mixture o...

Embodiment 2

[0040] Step (1). Add 200 grams of gallic acid to 1 liter of acetone solvent and mix evenly, then add 20 kilograms of polyethylene resin powder, mix thoroughly, and dry at 40° C. for 14 days to obtain the mixture powder;

[0041] Step (2). Put the mixture powder in the mold and place it on the hot plate of the flat vulcanizer, heat it to 240°C, pressurize it to 1MPa, and make the mixture powder sinter into a block; then cool down to 130°C and keep the pressure Unchanged for 0.5 hours, then lowered to normal temperature, and a block blank was obtained after demoulding;

[0042] Step (3). At normal temperature, irradiate the block blank under a 10MeV high-energy electron beam, and obtain an irradiation dose of 5Mrad each time, the total irradiation dose is 25Mrad, and the irradiation dose is measured by a standard irradiated chromogenic film; Obtained anti-oxidation highly cross-linked polymer after irradiation, denoted as sample B.

[0043] Sample B is a mixture of cross-linked...

Embodiment 3

[0050] Step (1). Add 100 grams of lauryl gallate to 1 liter of petroleum ether solvent and mix evenly, then add 100 kilograms of polyethylene resin powder, mix thoroughly, and dry at 60° C. for 10 days to obtain the mixture powder;

[0051] Step (2). Put the mixture powder in the mold and place it on the hot plate of the flat vulcanizer, heat it to 200°C, pressurize it to 10MPa, and make the mixture powder sinter into a block; then cool down to 120°C and keep the pressure Keep it unchanged for 24 hours, then drop to normal temperature, and get a block blank after demoulding;

[0052] Step (3). Under normal temperature, irradiate the block blank under a 5MeV high-energy electron beam, and obtain an irradiation dose of 1Mrad each time, the total irradiation dose is 5Mrad, and the irradiation dose is measured by a standard irradiated chromogenic film; Obtain anti-oxidation highly cross-linked polymer after irradiation, denoted as sample C.

[0053] Sample C is a mixture of cross...

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Abstract

The invention relates to an antioxidant cross-linked polymer and a preparation method thereof. The existing cross-linked ultra-high molecular weight polyethylene has relatively low strength and toughness. The polymer provided by the invention is a mixture of cross-linked ultra-high molecular weight polyethylene and an antioxidant at a weight ratio of (100-10000):1. The preparation method comprises the following steps of: dissolving the antioxidant into an organic solvent, adding the ultra-high molecular weight polyethylene resin powder, sufficiently mixing and drying; placing the mixture powder into a mould; heating and pressurizing so as to melt the mixture powder into block; cooling the block below the melting point and annealing while maintaining the pressure; reducing the temperature to normal temperature and demoulding to obtain block blank; and irradiating with high-power electron beam to obtain the product. The polyethylene material provided by the invention has excellent wear resistance, oxidation stability, tensile strength and impact strength, is suitable for manufacturing the friction lining of an artificial joint, and can reduce the wear of the artificial joint.

Description

technical field [0001] The invention relates to an anti-oxidation cross-linked polymer and a preparation method thereof. The polymer is suitable for implanting medical devices in the body, has excellent oxidation stability, and belongs to the technical field of materials science. Background technique [0002] Due to its excellent wear resistance, good mechanical properties and biocompatibility, ultra-high molecular weight polyethylene began to be used as a stress-bearing material for artificial joint linings in the 1960s. However, due to the long-term wear and tear of UHMWPE prosthetic components in the body, a large number of wear debris with a size below a few microns is generated, which can easily lead to osteolysis around the prosthesis, thereby causing aseptic loosening and artificial Joint failure. [0003] In the 1990s, people used radiation crosslinking technology to improve the wear resistance of ultra-high molecular weight polyethylene. However, the fatigue tough...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/13C08K5/134C08J3/28C08J3/24B29C35/02B29C71/04A61L27/16A61L27/50
Inventor 付俊钟翔高国荣程亚军
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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