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Artificial joint with durable lubricating surface layer and preparation method of artificial joint

An artificial joint and surface technology, applied in metal material coating technology, coating, medical science and other directions, can solve problems such as shedding and lubrication failure, and achieve the effect of preventing direct contact, good wear resistance, and good boundary lubrication

Pending Publication Date: 2021-03-26
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current research, grafting hydrophilic polymer brushes on the surface of artificial joints, as the use time increases, the surface grafted polymer chains are gradually sheared and peeled off from the substrate surface
Eventually, the base material comes into direct contact with the friction pair, causing lubrication failure

Method used

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  • Artificial joint with durable lubricating surface layer and preparation method of artificial joint

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Experimental program
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Effect test

preparation example Construction

[0043] The following is the preparation method for artificial joints prepared by using titanium alloy substrates. The overall steps are as follows

[0044] (1) carrying out hydroxylation treatment on the titanium alloy substrate to form a hydroxylated substrate;

[0045] (2) Soak the hydroxylated substrate in a silane coupling agent solution to form a silane layer;

[0046] (3) The titanium alloy substrate with the silane layer on the surface is coated with a photoinitiator benzophenone, added to the electrolyte monomer solution to be grafted, and irradiated by an ultraviolet lamp to form a polyelectrolyte brush layer;

[0047] (4) Immersing the titanium alloy substrate grafted with polyelectrolyte brushes on the surface into the first polyion electrolyte solution to form a single cross-linked polyelectrolyte brush layer;

[0048] (5) then put into the second polyion electrolyte solution to form a double cross-linked polyelectrolyte brush layer;

[0049] (6) Repeat steps (4)...

Embodiment 1

[0067] Preparation of 1# titanium alloy artificial joint with durable lubricating surface.

[0068] see figure 1 , subjecting the titanium alloy substrate to oxygen plasma treatment for 5 minutes to obtain a hydroxylated substrate; immersing the hydroxylated titanium alloy in a methacryloxypropyltriethoxysilane solution with a mass fraction of 1% for 1 hour; Coat the surface of the silanized titanium alloy with benzophenone at a concentration of 0.5 mg / mL, and then add it to the cationic monomer methacryloyloxyethyltrimethylammonium chloride solution to be grafted at a concentration of 0.05 mol / L, irradiated by UV lamp for 5min, please refer to figure 1 In the (a) step, the grafted polycation electrolyte brush layer 200 is formed, wherein the mark 210 represents the polyelectrolyte molecule in the graft polycation electrolyte brush layer 200, and the mark 220 represents the cationic group carried on the polyelectrolyte molecule 210 group.

[0069] The titanium alloy substra...

Embodiment 2

[0076] Preparation of 2# titanium alloy artificial joint with durable lubricating surface.

[0077] The titanium alloy substrate was irradiated with ultraviolet light for 20 minutes to obtain a hydroxylated substrate; the hydroxylated titanium alloy was immersed in a methacryloxypropyltriethoxysilane solution with a mass fraction of 3%, and the time 5h; Coat the surface of the silanized titanium alloy with benzophenone at a concentration of 1mg / mL, and then add it to the cationic monomer methacryloylpropyltrimethylammonium chloride solution to be grafted at a concentration of 1mol / L, irradiated with ultraviolet light for 10min to form a grafted polycation electrolyte brush layer; the titanium alloy substrate grafted with polycation electrolyte brushes on the surface was immersed in a sodium polystyrene sulfonate anion electrolyte solution with a concentration of 0.5mg / mL Take it out and wash it with deionized water; then dip it into the chitosan polycation electrolyte solutio...

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Abstract

The invention discloses an artificial joint with a durable lubricating surface layer. The artificial joint is composed of a substrate and a cross-linked polyelectrolyte brush layer prepared on the surface of the substrate, and the cross-linked polyelectrolyte brush layer comprises a polyelectrolyte brush layer formed on the substrate and polyelectrolyte molecules cross-linked on the polyelectrolyte brush layer. The preparation method of the joint comprises the following steps of (1) coating the surface of the substrate with an ultraviolet initiator, soaking the substrate into a grafted electrolyte monomer solution, and forming the polyelectrolyte brush layer under ultraviolet light; and (2) repeatedly and sequentially carrying out impregnation and cleaning of a first polyion electrolyte solution and impregnation and cleaning of a second polyion electrolyte solution on the substrate to form the cross-linked polyelectrolyte brush layer of which electrolyte molecules and polyelectrolyte brush molecules penetrate through each other, namely the durable lubricating surface layer. The artificial joint has a good durable lubricating effect, the lubricating service life of the polyelectrolyte brush is prolonged, the polyelectrolyte brush can still keep good tribological performance under the condition of long-term frictional wear, and the service life is prolonged.

Description

technical field [0001] The invention relates to an artificial joint with a durable lubricating surface layer and a preparation method thereof, especially an artificial joint designed to maintain good lubricating effect under long-term friction and wear and a preparation method thereof. Background technique [0002] Due to its good biocompatibility, corrosion resistance, fatigue resistance, etc., titanium alloys are currently commonly used replacement artificial joint materials, especially knee joint implant materials. However, its poor wear resistance limits its use as a bearing surface for artificial joints and seriously affects its service life. [0003] There have been reports on the modification of artificial joint materials by using graft modification technology. Grafting hydrophilic acrylic acid, N,N-dimethyl-N-methacrylamidopropyl-N,N-dimethyl-N-propanesulfonic acid inner salt on the surface of titanium alloy, grafted polymer brushes The formed hydration layer effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/06A61L27/04A61L27/16A61L27/18A61L27/34A61L27/50C23C26/00
CPCA61L27/06A61L27/045A61L27/34A61L27/50A61L27/16A61L27/18C23C26/00A61L2430/24A61L2420/08
Inventor 邓亚玲孙见君倪兴雅熊党生
Owner NANJING FORESTRY UNIV
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