Double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials

A nano-hydroxyapatite, hydroxyapatite technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry and other directions, can solve the problem of small interface binding force, difficult to achieve carbon nanotube dispersion effect and interface binding effect, hydroxyl Apatite composite materials are difficult to clinically apply and other problems to avoid toxicity

Inactive Publication Date: 2015-06-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

CN201210555876 is a technology developed by the inventor team earlier. Through practical application, it is found that this prior art has the following defects: After a large number of studies, it has been shown that the toxicity of carbon nanotubes in the body is mainly caused by lung inflammation and fibrosis, circulatory system Oxidative damage, atherosclerosis and systemic immune system abnormalities, etc. Therefore, in the preparation process of such composite materials, it is often necessary to take necessary technological measures to reduce the toxicity of carbon nanotubes and improve the biocompatibility of composite materials
The process method adopted in CN201210555876 is that after carbon nanotube-hydroxyapatite powder is put into deionized water, various raw materials such as sodium chloride and sodium bicarbonate are sequentially dissolved into the above-mentioned deionized water to make hydroxyapatite The defects of forming and modifying the surface of carbon nanotubes in a solution are as follows: First, through the liquid-phase chemical reactions of the above-mentioned various raw materials, the formed product is nano-particle hydroxyapatite, and this Only a very small amount of hydroxyapatite in shape and particle size can be attached to the surface of carbon nanotubes by physical adsorption. The patent specification is attached image 3 speaks volumes for this
As we all know, the physical adsorption force between carbon nanotubes and nano-hydroxyapatite particles belongs to the category of van der Waals force, therefore, the interfacial bonding force between the two is very small, and it is difficult to achieve the effect of transferring load and inhibiting crack growth. effect; in the subsequent process of making the above powder into a bulk composite material by pressing in the patent, chemical bon

Method used

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  • Double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials
  • Double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials
  • Double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The first step, in-situ synthesis of carbon nanotube-hydroxyapatite in-situ mixed powder:

[0030] Be nanometer ferric oxide by mass ratio: the ratio of nanometer hydroxyapatite=0.026: 1, take by weighing required nanometer ferric oxide and nanometer hydroxyapatite, adopt agate mortar to mix the two homogeneously, will The quartz ark containing the above mixture was placed in the constant temperature zone of the horizontal tube furnace, and nitrogen gas was introduced into the tube furnace at a flow rate of 90mL / min and the temperature was raised to 600°C. Pass hydrogen into the formula furnace and keep it warm for 0.5h to obtain the iron-hydroxyapatite catalyst. Then turn off the hydrogen and continue to let the mixed gas with a volume ratio of nitrogen:propane=20:1 at a flow rate of 300mL / min and keep warm for 0.5 h, then turn off the propane and adjust the nitrogen flow, so that the quartz ark equipped with the above mixture in the tube furnace is cooled to room temp...

Embodiment 2

[0040] The first step, in-situ synthesis of carbon nanotube-hydroxyapatite in-situ mixed powder:

[0041] Be nanometer ferric oxide by mass ratio: the ratio of nanometer hydroxyapatite=0.1: 1, take by weighing required nanometer ferric oxide and nanometer hydroxyapatite, adopt agate mortar to mix the two homogeneously, will The quartz ark containing the above mixture was placed in the constant temperature zone of the horizontal tube furnace, and nitrogen gas was introduced into the tube furnace at a flow rate of 110mL / min and the temperature was raised to 700°C. Pass hydrogen into the formula furnace and keep it warm for 1.5h to obtain the iron-hydroxyapatite catalyst. Then turn off the hydrogen, and continue to pass the mixed gas with a volume ratio of nitrogen:propane=30:1 at a flow rate of 400mL / min, and keep warm for 0.75 h, then turn off the propane and adjust the nitrogen flow, so that the quartz ark equipped with the above mixture in the tube furnace is cooled to room t...

Embodiment 3

[0047] The first step, in-situ synthesis of carbon nanotube-hydroxyapatite in-situ mixed powder:

[0048] Be nanometer ferric oxide by mass ratio: the ratio of nanometer hydroxyapatite=0.176: 1, take by weighing required nanometer ferric oxide and nanometer hydroxyapatite, adopt agate mortar to mix the two homogeneously, will The quartz ark containing the above mixture was placed in the constant temperature zone of the horizontal tube furnace, and nitrogen gas was introduced into the tube furnace at a flow rate of 130mL / min and the temperature was raised to 800°C, then the nitrogen gas was turned off, and the tube furnace was injected at a flow rate of 130mL / min. Pass hydrogen into the formula furnace and keep it warm for 2.5h to obtain the iron-hydroxyapatite catalyst, then turn off the hydrogen, and continue to let the mixed gas with a volume ratio of nitrogen:propane=40:1 at a flow rate of 500mL / min and keep it warm for 1h , then turn off the propane and adjust the nitrogen...

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Abstract

The invention relates to composite materials for prosthesis materials, in particular to a double in-situ synthesis method for preparing carbon nano tube reinforced hydroxyapatite composite materials. The method comprises the steps that 1, in-situ synthesis of carbon nano tube-hydroxyapatite in-situ mixed powder is carried out; 2, double in-situ synthesis of carbon nano tube-hydroxyapatite in-situ composite powder is carried out; 3, the carbon nano tube reinforced hydroxyapatite composite materials are prepared. On the basis of preparing the carbon nano tube-hydroxyapatite in-situ composite powder, a hydroxyapatite layer which is dense in coating and controllable in structure is synthesized on the surface of the carbon nano tube through a sol-gel process, the carbon nano tube reinforced hydroxyapatite composite materials are prepared, the prefect structure of a carbon nano tube and the good biocompatibility of the hydroxyapatite composite materials are both achieved, meanwhile, the dispersion effect of the carbon nano tube and the interface combination effect are obviously improved, the carbon nano tube reinforced hydroxyapatite composite materials with the excellent mechanical property and the biocompatibility are made, and the carbon nano tube reinforced hydroxyapatite composite materials are widely applied to the bio-medical field.

Description

technical field [0001] The technical solution of the invention relates to a composite material used for prosthetic materials, in particular to a double in-situ synthesis method for preparing a carbon nanotube reinforced hydroxyapatite composite material. Background technique [0002] Due to its good biocompatibility, osteoconductivity and bioactivity, hydroxyapatite has broad application prospects as hard tissue implants and has attracted great attention. However, pure hydroxyapatite materials have poor mechanical properties and reliability, especially high brittleness, low flexural strength and fracture toughness, and are difficult to be directly used as load-bearing implants. Since carbon nanotubes were discovered by Iijima, due to their extremely high strength, toughness, and excellent electrical, magnetic, and thermal properties, they have become a recognized super-strong one-dimensional reinforcement material. The use of carbon nanotubes to strengthen hydroxyapatite co...

Claims

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Application Information

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IPC IPC(8): C01B25/32
Inventor 李海鹏赵秋艳范佳薇李宝娥闵阳
Owner HEBEI UNIV OF TECH
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