A kind of low-temperature thermoplastic plate and preparation method thereof
A low-temperature thermoplastic and plate technology, applied in the field of medical devices, can solve the problems of material inhomogeneity, local mechanical strength, decline, etc., and achieve the effects of good fixing effect, strong comfort and improved compatibility
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[0036] The present invention also provides a method for preparing the above-mentioned low-temperature thermoplastic plate, comprising: A) mixing 80-95 parts by weight of polycaprolactone, 5-20 parts by weight of polylactic acid and 2-4 parts by weight of coupling agent After melting, reaction, blending and extruding, irradiation treatment is performed to obtain a low-temperature thermoplastic sheet.
[0037] According to the present invention, the polycaprolactone is preferably dried first to obtain the dried polycaprolactone; the temperature of the drying treatment is preferably 40° C. to 55° C.; the drying treatment time is preferably is 4 to 6 hours; the polylactic acid is preferably dried first to obtain the dried polylactic acid; the temperature of the drying treatment is preferably 40°C to 55°C; the drying time is preferably 4 to 50°C. 6h.
[0038] The dried polycaprolactone, the dried polylactic acid and the coupling agent are preferably mixed first, then melted, react...
Embodiment 1
[0043] Dry 95 parts by weight of polycaprolactone (Mn=50000g / mol) and 5 parts by weight of polylactic acid (Mn=30000g / mol) at 50°C for 4 hours, add 2 parts by weight of isophorone diisocyanate, and stir in a high-speed mixer 10min to make it mix evenly, and then add it to a twin-screw extruder for melt reaction and extrusion. Set the temperature of the extruder along the direction from the feeding port to the die to be 110-160°C, the die temperature to be 135°C, carry out melt reaction blending at a speed of 80rpm, and extrude to obtain a plate with a thickness of 2.4mm; use a dose of 50kGy to carry out Electron beam irradiation to obtain low temperature thermoplastic sheet.
[0044] The low-temperature thermoplastic sheet obtained in Example 1 was tested for elastic modulus, deformation recovery rate and shrinkage force, and the results are listed in Table 1.
Embodiment 2
[0046] Dry 80 parts by weight of polycaprolactone (Mn=30000g / mol) and 20 parts by weight of polylactic acid (Mn=20000g / mol) at 50°C for 4 hours, add 4 parts by weight of isophorone diisocyanate, and stir in a high-speed mixer 10min to make it mix evenly, and then add it to a twin-screw extruder for melt reaction and extrusion. Set the temperature of the extruder along the direction from the feeding port to the die to be 130-180°C, the die temperature to be 150°C, and carry out melt reaction blending at a speed of 100rpm to obtain a plate with a thickness of 3.2mm; use a dose of 200kGy for electron beam Irradiate to obtain a low-temperature thermoplastic sheet.
[0047] The low-temperature thermoplastic sheet obtained in Example 2 was tested for elastic modulus, deformation recovery rate and shrinkage force, and the results are listed in Table 1.
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