Shape memory processing biodegradating vitro fixed material for medical use and its preparation
A biodegradable, external fixation technology, applied in medical science, bandages, absorbent pads, etc., can solve the problems of being impermeable to X-rays, airtight, and secondary molding, and achieves good air permeability, water resistance, strong permeability, Good toughness of the product
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Embodiment 1
[0044]Raw material ratio (percentage by weight): polylactic acid (number average molecular weight 55000, left-handed content is 88%) 60%, 800 mesh calcium carbonate 37%, γ-aminopropyltriethoxysilane (KH-550 silane coupling agent ) 1%, colorant transparent yellow 3G 0.5%, white oil 1.5%, premixed; complete mixing and granulation in a twin-screw extruder. Then the prepared particles are dried in a fluidized bed, extruded on a plate extruder, and calendered into a plate; then the plate is heat-treated, punched on a punching machine, cut into different specifications, and packaged into a product. Similarly, after the net extruder is extruded into a net, it is made into a net by conventional plastic processing methods such as calendering, compression molding, heat preservation, and cooling, and then cut, coiled, and packaged into a product.
[0045] The softening temperature of both products is 60°C. When in use, immerse the fixed plate in warm water at 60°C, and take it out after...
Embodiment 2
[0047] The polylactic acid has a number average molecular weight of 55,000 and a levorotatory content of 92%. The raw material composition and preparation operation are the same as in Example 1, and the softening temperature of the product is 65°C.
Embodiment 3
[0049] The polylactic acid has a number average molecular weight of 55,000 and a levorotatory content of 85%. The raw material composition and preparation operation are the same as in Example 1, and the softening temperature of the product is 56°C.
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