Crimping resistant film
An anti-curling and thin-film technology, applied in bandages, surgery, absorbent pads, etc., can solve problems such as high cost, low market acceptance, and poor clinical operability
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preparation example 1
[0054] Preparation of Polyethylene Glycol Dimethacrylate (PEGDMA)
[0055](1) 50 g of polyethylene glycol (PEG) (molecular weight 8,000) was taken into a reaction tank and dissolved in 350 ml of tetrahydrofuran (THF). And pass high-purity nitrogen to remove moisture. (2) Dissolve methacrylic anhydride (MA) in 100 ml of tetrahydrofuran (THF), and slowly drop it into the above polyethylene glycol (PEG) solution, polyethylene glycol (PEG) and methacrylic acid The ratio of anhydride (MA) was 1:5. (3) Continue to feed nitrogen and maintain the reaction temperature at 80°C for 8 hours. Next, add ether 10 times larger than the original volume for precipitation purification, and then filter the precipitation sample. (4) Re-dissolve the precipitated sample into tetrahydrofuran (THF) at 60°C and 100 mL, and after performing the above step (3), after the sample is filtered, dry it in an air extraction cabinet at room temperature of 22-27°C , polyethylene glycol dimethacrylate (PEGD...
preparation example 2
[0057] Preparation of photocurable layer
[0058] First, a solution (Solution 1) containing 1 g of polycaprolactone (PCL) and 10 g of polyethylene glycol dimethacrylate (PEGDMA) was prepared, and a solution containing 2 g of polylactic acid (PLA) and 2 g of polyethylene glycol dimethyl methacrylate was prepared Dichloromethane (DCM) was used as a solvent for the solution of acrylic acid ester (PEGDMA) (solution 2), solution 1 and solution 2. When the solution 1 and the solution 2 are prepared, the initiator I2959 is added to the two solutions respectively, and the addition amount is 0.05 and 0.01 g, and the two solutions are completely dissolved for 16 to 24 hours.
[0059] Next, the solution 2 was coated on the Teflon flat substrate to form a film, and the coating thickness was set to 150 μm. Wait for about 10 minutes after the film formation of solution 2 is completed, and then pour solution 1 onto the film formed by solution 2 (the coating and film formation of solution ...
preparation example 3
[0061] Preparation of protective layer
[0062] First, prepare a solution containing 4 g of polycaprolactone (PCL) and 0.5 g of alginic acid (AA). PCL uses dichloromethane (DCM) as solvent, and AA is deionized water (DDW) in an oven at 50 degrees dissolve in the environment. After the respective preparations are completed, the two are mixed, stirred and emulsified to complete the preparation (solution 1).
[0063] A solution (Solution 2) containing 4 g of polycaprolactone (PCL) and 0.1 g of polyvinyl alcohol (PVA) was prepared using dichloromethane (DCM) as solvent for PCL and deionized water (DDW) for PVA in Dissolve in an oven at 50°C. After the respective preparations are completed, the two are mixed, stirred and emulsified to complete the preparation (solution 2).
[0064] Next, the solution 2 was coated on the Teflon flat substrate to form a film, and the coating thickness was set to 150 μm. Wait for about 10 minutes after the film formation of solution 2 is complet...
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