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Method for preparing organic film on surface of NiTi alloy

An organic film and alloy technology, applied in the surface modification of NiTi alloy, NiTi alloy surface modification based on organic film layer, can solve the problems of inorganic film layer elastic strain difference, biological inertia, crack formation, functional characteristics, failure, etc., to achieve The effect of extending the range

Active Publication Date: 2011-10-12
BEIJING RADIATION APPL RES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of the traditional NiTi alloy surface modification method based on the inorganic film layer, such as poor elastic strain and biological inertness of the inorganic film layer, which easily lead to the formation of cracks and the failure of functional characteristics, and provide a method based on Surface modification method of NiTi alloy with organic film layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) NiTi alloy pretreatment

[0031] Grind and polish the NiTi alloy to a mirror surface, and ultrasonically clean it in acetone, ethanol, and distilled water for 10 minutes before use.

[0032] (2) NiTi alloy irradiation

[0033] The NiTi alloy obtained in step (1) is irradiated at room temperature, and the radiation source is 60 For Co gamma rays, the irradiation dose rate is 10Gy / min, and the irradiation dose is 10kGy.

[0034] (3) Surface activation of NiTi alloy

[0035] The NiTi alloy obtained in step (2) is immersed in 30% H with a volume ratio of 1:1. 2 o 2 with a concentration of 98% H 2 SO 4 Activate in the mixed solution for 2 hours, take out the activated NiTi alloy, wash it with absolute ethanol and distilled water in sequence, and dry it for use.

[0036] (4) NiTi alloy surface silanization

[0037] The surface-activated NiTi alloy obtained in step (3) was soaked in a chloroform solution with a volume fraction of 3% vinyltrichlorosilane for 8 hours...

Embodiment 2

[0041] (1) NiTi alloy pretreatment

[0042] Grind and polish the NiTi alloy to a mirror surface, and ultrasonically clean it in acetone, ethanol, and distilled water for 15 minutes before use.

[0043] (2) NiTi alloy irradiation

[0044] The NiTi alloy obtained in step (1) is irradiated at room temperature, and the radiation source is 60 For Co gamma rays, the irradiation dose rate is 20Gy / min, and the irradiation dose is 100kGy.

[0045] (3) Surface activation of NiTi alloy

[0046] The NiTi alloy obtained in step (2) is immersed in 30% H with a volume ratio of 1:2. 2 o 2 with a concentration of 98% H 2 SO 4 Activate in the mixed solution for 3 hours, take out the activated NiTi alloy, wash it with absolute ethanol and distilled water in sequence, and dry it for use.

[0047] (4) NiTi alloy surface silanization

[0048] The surface-activated NiTi alloy obtained in step (3) was placed in an anhydrous toluene solution with a volume fraction of 5% vinyltrimethoxysilane and...

Embodiment 3

[0052] (1) NiTi alloy pretreatment

[0053] The NiTi alloy was ground and polished to a mirror surface, and ultrasonically cleaned in acetone, ethanol, and distilled water for 30 minutes before use.

[0054] (2) NiTi alloy irradiation

[0055] The NiTi alloy obtained in step (1) is irradiated at room temperature, and the radiation source is 60 For Co gamma rays, the irradiation dose rate is 50Gy / min, and the irradiation dose is 150kGy.

[0056] (3) Surface activation of NiTi alloy

[0057] The NiTi alloy obtained in step (2) is immersed in 30% H with a volume ratio of 1:3. 2 o 2 with a concentration of 98% H 2 SO 4 Activate in the mixed solution for 2 hours, take out the activated NiTi alloy, wash it with absolute ethanol and distilled water in sequence, and dry it for use.

[0058] (4) NiTi alloy surface silanization

[0059] The surface-activated NiTi alloy obtained in step (3) was placed in an anhydrous toluene solution with a volume fraction of 10% vinyltriethoxysi...

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PUM

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Abstract

The invention relates to an organic film-based NiTi alloy surface modification method, and belongs to the field of metal material surface modification. The method comprises the following steps of: irradiating a preprocessed NiTi alloy by using 60Co at room temperature, immersing in a mixed solution of H2O2 and H2SO4 for activation, performing silanization by using vinylsilane, irradiating by using gamma-rays of the 60Co, and grafting organic monomer or polymer to obtain the organic film on the surface of the NiTi alloy. The organic film prepared on the surface of the NiTi alloy can be prepared into a biological material with high biocompatibility through a molecular design; the film is bound with the surface of the NiTi alloy in a form of covalent bond, and the binding force is large; the grafting ratio of the reaction is controlled by adjusting parameters such as irradiation dose, dose rate, organic monomer or polymer concentration and the like, and the performance of the organic film on the surface of the NiTi alloy is improved; the adopted mutual irradiation grafting method is easy and convenient to implement, the utilization rate of radiation energy is high, a chemical initiator is not needed to be added, and the product is pure; meanwhile, materials can be sterilized in the irradiation process, and biomedical materials are convenient to use.

Description

technical field [0001] The invention relates to a method for modifying the surface of a NiTi alloy, in particular to a method for modifying the surface of a NiTi alloy based on an organic film layer, and belongs to the field of surface modification of metal materials. Background technique [0002] NiTi alloy has a unique shape memory effect and superelasticity, and is commonly used as functional biomedical metal implants, such as bone plates, spinal orthopedic rods, orthodontic wires, and various lumen brackets. TiO Spontaneously Formed on the Surface of NiTi Alloy 2 The biologically inert oxide film layer causes local deformation and loose peeling, and the surface self-oxidation ability of the peeled NiTi alloy is poor, causing local corrosion such as pitting corrosion, reducing the overall corrosion resistance of the alloy, and causing Ni ions to dissolve. When NiTi alloys are used as long-term implants, the dissolved Ni ions are cytotoxic, which can easily cause problems...

Claims

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Application Information

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IPC IPC(8): B05D3/00B05D5/00A61L27/06A61L27/34
Inventor 于宏燕曾心苗李岩王连才翟宇鲍矛
Owner BEIJING RADIATION APPL RES CENT
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