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Preparing method for composite coating comprising metal organic frame MOF and polycaprolactone PCL and degrading surface of magnesium alloy

A metal-organic framework and composite coating technology, which can be applied to devices, coatings, special surfaces, etc. for coating liquids on the surface, which can solve problems such as damage, and achieve the effects of less equipment investment, less difficulty in implementation, and good compactness.

Active Publication Date: 2020-01-10
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, HKUST-1 contains more carboxyl groups, water molecules can easily enter its pores and destroy its structure

Method used

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  • Preparing method for composite coating comprising metal organic frame MOF and polycaprolactone PCL and degrading surface of magnesium alloy
  • Preparing method for composite coating comprising metal organic frame MOF and polycaprolactone PCL and degrading surface of magnesium alloy
  • Preparing method for composite coating comprising metal organic frame MOF and polycaprolactone PCL and degrading surface of magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Step 1, magnesium alloy mechanical polishing

[0036] Grind the AZ31 magnesium alloy with 2400 grit sandpaper on a polishing machine until the surface is smooth with a mirror finish. Put the polished AZ31 magnesium alloy in absolute ethanol and ultrasonically clean it for 15 minutes, dry it naturally at room temperature, and set aside;

Embodiment 2

[0038] Step 1, magnesium alloy mechanical polishing

[0039] Grind the AZ31 magnesium alloy with 2400 grit sandpaper on a polishing machine until the surface is smooth with a mirror finish. Put the polished AZ31 magnesium alloy in absolute ethanol and ultrasonically clean it for 15 minutes, dry it naturally at room temperature, and set aside;

[0040] Step 2, preparing the PCL coating, the specific steps are:

[0041] 1) PCL is dissolved in dichloromethane to obtain a concentration of 6wt% solution

[0042] 2) The above solution was added dropwise on the surface of the magnesium alloy obtained in step 1, and dried in an oven at 37°C. After complete drying, the PCL solution was added dropwise on the surface of the magnesium alloy and dried to obtain a sample Mg-PCL. The volume of each dropwise solution was 50 μL.

Embodiment 3

[0044] Step 1, magnesium alloy mechanical polishing

[0045] Grind the AZ31 magnesium alloy with 2400 grit sandpaper on a polishing machine until the surface is smooth with a mirror finish. Put the polished AZ31 magnesium alloy in absolute ethanol and ultrasonically clean it for 15 minutes, dry it naturally at room temperature, and set aside;

[0046] Step 2, preparing folic acid-modified MOF powder, the specific steps are:

[0047] 1) Dissolve 36mL of folic acid in dimethyl sulfoxide (concentration: 1.64mmol / L), stir and mix with 0.8mL of trimesic acid ethanol solution (concentration: 260mol / L), add 34mL of 50% ethanol, and 1 mL aqueous solution of copper acetate monohydrate (concentration: 375 mol / L) was added dropwise. The rotational speed was adjusted to 300 rpm, and the reaction was stirred for 40 minutes.

[0048] 2) The resulting solution was centrifuged at 8000 rpm for 2 minutes with a centrifuge, then washed three times with a mixed solvent of dimethyl sulfoxide, abs...

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Abstract

The invention provides a preparing method for a composite coating comprising a metal organic frame MOF and polycaprolactone PCL and degrading the surface of a magnesium alloy. The preparing method includes the following steps that firstly, mechanical polishing treatment of the magnesium alloy is conducted; secondly, folic acid modification MOF powder is prepared; and thirdly, the PCL-MOF compositecoating is prepared. By means of the preparing method, folic acid modification HKUST-1 (MOF-FA) and a PCL solution are mixed, and the mixed solution is dripped to the surface of the AZ31 magnesium alloy to form the composite coating (PCL-MOF). In the coating, a hydrogen bond can be formed between MOF and PCL, compactness of PCL is improved, and the effect of delaying magnesium alloy corrosion isachieved; and meanwhile, MOF-FA can also be adopted as the carrier of copper ions, the copper ions are released slowly in the coating degrading process, and proliferation and differentiation of bone cells are promoted.

Description

technical field [0001] The invention relates to the technical field of metal organic framework materials, polymer coatings and biodegradable metal materials, in particular to a method for preparing a composite coating comprising metal organic framework MOF and polycaprolactone PCL on the surface of a degradable magnesium alloy. Background technique [0002] Due to its suitable mechanical properties and special biological functions, magnesium (Mg) and its alloys have shown great potential in the field of biomaterials, and have good prospects in orthopedic implants and cardiovascular stents. Compared with other orthopedic implant materials, the biodegradability of magnesium alloys has obvious advantages, because during the healing process, the implanted magnesium alloys can slowly degrade while the tissue is re-formed, and provide sufficient mechanical properties. performance, so a second removal surgery can be avoided. In addition, as an essential element in the human body, ...

Claims

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Application Information

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IPC IPC(8): B05D3/00B05D3/02B05D5/00B05D7/14B05D7/24
CPCB05D3/002B05D7/24B05D7/14B05D3/0254B05D5/00
Inventor 刘想梅郑祺瑶吴水林
Owner HUBEI UNIV
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