A kind of medical polyurethane elastomer with biocompatibility and preparation method thereof

Abstract

The invention relates to a medical polyurethane elastic fiber with biocompatibility and a preparation method thereof. The preparation method comprises the following steps: 1) adding polyglycol A, aliphatic diisocyanate B, chain extender glycol C, a catalyst, an auxiliary additive and the like directly into a twin-screw reactor after metering for melting, mixing and slicing to prepare a polymer P1;2) mixing and reacting modified aliphatic diisocyanate B' with polyglycol A to generate a prepolymer P2; 3) after the polymer P1 is fused and extruded and fully mixed with the prepolymer P2 in a certain proportion in a static mixer, distributing the mixture to a spinneret plate through a melt metering pump; and 4) spinning the polyurethane elastic fiber through a spinning box, a side blowing cooling device, a spinning tunnel, false twisting, oiling and a silk guide roller. The polyurethane elastic fiber prepared by the method provided by the invention has excellent biocompatibility.

Description

technical field [0001] The invention relates to a medical polyurethane elastic fiber with biocompatibility and a preparation method thereof, belonging to the field of polyurethane elastic fiber. The spandex fiber prepared by the invention has excellent biocompatibility and can be used in the medical field, surgical sutures, elastic bandages and the like. Background technique [0002] Polyurethane elastic fiber is a multi-block copolymer with alternating soft and hard segments. It has the advantages of high breaking strength and large elastic recovery rate. Its structure contains many -NHCOO- groups. By selecting appropriate soft and hard segments By combining the structure and its ratio, polymer materials with excellent physical and mechanical properties can be synthesized. [0003] At present, the dry spinning method is the most widely used method for the production of polyurethane elastic fibers at home and abroad, accounting for more than 80% of the global spandex produc...

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Problems solved by technology

[0006] Chinese Patent CN08705A "A Method for Producing Polyurethane Elastic Fiber" studied the melting method of polyurethane elastic fiber in 1994, but compared with the dry process, the fiber prepared by the melting method has certain limitations in mechanical properties and uniformity. Insufficient and, therefore, not widely promoted

[0007] Chinese patent CN106048774A "A Production Method of Polyurethane Elastic Fiber" provides a well-known polyurethane elastic fiber melting method production process - polyester or polyether polyol + diisocyanate + small molecule chain extender diol, but in fact As stated by the inventor, a large number of scholars have shown that it is difficult to obtain polyurethane elastic fibers with excellent heat resistance and filament uniformity by similar processes.

However, it still has some shortcomings in terms of mechanical properties and physical and chemical resistance compared with dry technology. Therefore, under the melting process, using physical and chemical modification technology to improve the overall performance of the product and meet the requirements of medical equipment is the first choice for medical polyurethane elastic fibers. one of the directions