2results about How to "Avoid Biosecurity Concerns" patented technology

The invention relates to the technical field of fiber manufacturing processes, in particular to a preparation method of perovskite fluorescent quantum dot continuous long fibers, which comprises the following steps: (1) preparing perovskite quantum dot nanoparticles by adopting a B-site cation adsorption strategy; (2) dissolving TPU in DMF to prepare a TPU solution, dissolving the nanoparticles prepared in the step (1) in the TPU solution, and heating and stirring to prepare a spinning solution; (3) adding the spinning solution into a spinning device by adopting a wet spinning technology, putting a spinning nozzle into a coagulating bath for coagulating, and finally collecting continuous long fibers through a drafting device; according to the method, the migration of lead ions is inhibited through the ionic bonding effect, then controllable growth of perovskite nanocrystals under the lead ion constraint condition is achieved through ionic coordination, the lead leakage risk of the perovskite material is reduced, and the problems that the production condition of perovskite fluorescent quantum dot fibers is harsh, and continuous long fibers cannot be prepared are solved.

The application discloses degradable swelling hemostatic cotton and a preparation method thereof, and comprises the following steps: melt blending degradable nylon copolymer, polar polymer and crosslinking agent in a banbury mixer to obtain a polymer blend; dissolving the polymer blend in a benign solvent, freeze-drying into hemostatic cotton, and packaging and sterilizing to obtain a finished product. In the process of melt blending, a condensation reaction of carboxyl-amino occurs between the degradable nylon, the degradable polar polymer and the crosslinking agent, a stable chemical crosslinking point is generated through the chemical reaction, the structural integrity of the product can be maintained in the degradation process, and the collapse or breakage phenomenon is avoided.