Method for preparing polyurethane medical anti-infectious interventional catheter
An interventional catheter and anti-infection technology, applied in catheters and other directions, can solve the problems of limited selection of antibacterial agents, catheter damage and deformation, and coating thickness restrictions, and achieve the effects of convenient operation, high loading capacity, and low cost
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Embodiment 1
[0026] Put 500 grams of composite antibacterial agent (inorganic silver-carrying antibacterial agent and organic antibacterial agent triclosan are mixed in a mass ratio of 1:9) and 1500 grams of polyethylene-vinyl acetate (vinyl acetate content is 28%) into a vacuum oven Dry for 12 hours with an oven temperature of 60°C. Remove after cooling to room temperature. Mix the compound antibacterial agent and polyethylene-vinyl acetate evenly, add it into the feed hopper of the twin-screw machine, and extrude and granulate. The prepared master batch was put into a vacuum drying oven (temperature of 60° C.) for drying for 24 hours. Take 140 grams of antibacterial pellets, mix with 1860 grams of dried barium sulfate mixed polyurethane, add to the hopper of a single-screw extruder, and extrude to obtain a catheter with anti-infection function.
Embodiment 2
[0028] Put 400 grams of composite antibacterial agent (ciprofloxacin and rifampicin are mixed in a mass ratio of 1:2) and 1600 grams of barium sulfate-doped polyurethane into a vacuum oven for drying for 12 hours, and the oven temperature is 80°C. Remove after cooling to room temperature. Mix the composite antibacterial agent with barium sulfate-doped polyurethane, then add 4 grams of antioxidant 1010, 3.2 grams of UV stabilizer 770, 7 grams of zinc stearate and 7 grams of calcium stearate, and mix the raw materials evenly. , added to the feed hopper of the twin-screw machine, extruded and granulated. The prepared master batch was put into a vacuum drying oven (temperature of 80° C.) for drying for 24 hours. Take 40 grams of antibacterial masterbatch, mix it with 1960 grams of dried barium sulfate-doped polyurethane, add it to the hopper of a single-screw extruder, and extrude to obtain a catheter with anti-infection function.
Embodiment 3
[0030] Put 700 grams of composite antibacterial agent (inorganic silver-carrying antibacterial agent and minocycline are mixed in a mass ratio of 1:8) and 1300 grams of polyether polyurethane into a vacuum oven for drying for 12 hours, and the oven temperature is 70 ° C. Remove after cooling to room temperature. Then the composite antibacterial agent is mixed with polyether polyurethane, and then 4 grams of antioxidant 1010, 1.6 grams of UV stabilizer 770, 16 grams of zinc stearate and 16 grams of calcium stearate are added, and the raw materials are mixed evenly. , added to the feed hopper of the twin-screw machine, extruded and granulated. The prepared master batch was put into a vacuum drying oven (temperature of 80° C.) for drying for 24 hours. Take 100 grams of antibacterial masterbatch, mix it with 1900 grams of dried barium sulfate-doped polyurethane, add it to the hopper of a single-screw extruder, and extrude to obtain a catheter with anti-infection function.
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