Surface coating for improving corrosion resistance and antibacterial performance of bio-medical magnesium alloy
A biomedical and surface coating technology, applied in the fields of coating, medical science, tissue regeneration, etc.
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Embodiment 1
[0019] Preparation of antibacterial adsorption monomers containing dihydroxyl groups: Weigh 5.00 g of polyethylene glycol methyl ether methacrylate (Mn=300) into a weighing bottle, add 6.87 g of mercaptopropylene glycol and initiator 2,2'- Add 0.0218 g of nitrogen isobutyronitrile, add 50 ml of distilled and purified tetrahydrofuran, put the sealed tube into liquid nitrogen to freeze for 30 min, and vacuumize at the same time. Then it was stirred and reacted at 600°C for 24 h, concentrated by rotation to remove most of the solvent, and the concentrated product was precipitated twice in n-hexane, and placed in a vacuum oven at 30°C for 24 h to obtain a dihydroxy antibacterial adsorption monomer.
[0020] Preparation of water-based polyurethane emulsion with antibacterial function: Weigh 30.00 g polycarbonate diol (M n =2000) into the reactor, add 6.96 g of hexamethylene diisocyanate and 300 ml of tetrahydrofuran solvent into the reactor, stir mechanically under the protection o...
Embodiment 2
[0023]Preparation of antibacterial adsorption monomers containing dihydroxyl groups: Weigh 3.50 g polyethylene glycol methyl ether methacrylate (Mn=500) polyethylene glycol monomethyl ether methacrylate into a weighing bottle, add 1.50 g Add 0.005 g of mercaptopropylene glycol and initiator, add 30 ml of distilled and purified tetrahydrofuran, put the sealed tube into liquid nitrogen to freeze, and simultaneously pump a vacuum. Then it was stirred and reacted at 70°C for 12 h, concentrated by rotation to remove most of the solvent, and the concentrated product was precipitated twice in n-hexane, and placed in a vacuum oven at 30°C for 24 h to obtain a dihydroxy antibacterial adsorption monomer.
[0024] Preparation of water-based polyurethane emulsion with antibacterial function: Weigh 30.00 g polycaprolactone diol (M n =2000) into a 500 ml three-necked flask, vacuum dehydrated for 2 h, and the temperature was lowered to 60°C, 8.24 g of lysine diisocyanate was added, 300 ml of...
Embodiment 3
[0027] Preparation of antibacterial adsorption monomers containing dihydroxyl groups: Weigh 7.50 g of polyethylene glycol methyl ether methacrylate (Mn=950) into a weighing bottle, add 1.50 g of mercaptopropylene glycol and 0.0115 g of initiator, and add 30 ml The purified tetrahydrofuran was distilled, and the sealed tube was frozen in liquid nitrogen for 30 min while vacuuming. Then it was stirred and reacted at 80°C for 12 h, and concentrated by rotation to remove most of the solvent. The concentrated product was precipitated twice in n-hexane, and placed in a vacuum oven at 35°C for 24 h to obtain a dihydroxy antibacterial adsorption monomer.
[0028] Weigh 15.00 g double-terminated hydroxyl polylactic acid (M n =1000), added to a 500 ml three-necked flask, vacuum dehydrated for 2 h, added 7.89 g of hexamethylene diisocyanate, added 300 ml of THF, mechanically stirred under nitrogen protection, and reacted at 60 °C for 30 min. Add 8.0 g of dihydroxy antibacterial adsorpti...
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