Antibacterial resin and manufacturing method therefor

A method for manufacturing an antibacterial resin, the method comprising:

• a preparation step of preparing synthetic resin powder and an antibacterial additive;
• a dispersion step of, after the preparation step, introducing into a mixer the synthetic resin powder together with iron balls having a pointed protrusion formed on an outer surface thereof and dispersing particles of the powder;
• a dispersion and mixing step of after the dispersion step, introducing the antibacterial additive into the mixer containing the synthetic resin powder, followed by dispersion and mixing;
• a pellet forming step of, after the dispersion and mixing step, separating the iron balls and forming the mixture of the synthetic resin powder and the antibacterial additive into pellets by melting, extrusion and cutting;
• and
• a product producing step of, after the pellet forming step, introducing the pellets into an injection molding machine to produce an antibacterial resin product;
• wherein white charcoal powder is included in the antibacterial additive in the mixing step;
• wherein the pellet forming step is performed using a pellet forming machine comprising:
• a cylinder (110) open at one end;
• a piston (120) inserted in the cylinder (110) and having compression function;
• dies (130) provided opposite to the piston (120) in the cylinder (110) and configured to form pellets (P);
• a heating wire (140) wound around an outer surface of the cylinder (110) and configured to generate heat by supply of electricity;
• and a frame (150) configured to rotatably support the cylinder (150);
• and
• wherein the pellet forming step comprises:
• an injection step of injecting the mixture of the synthetic resin powder and the antibacterial additive into an inlet of the cylinder (110);
• a melting step of, after the injection step, rotating the cylinder (110) so that the dies (130) face upwards and applying electricity to the heating wire (140) to heat the cylinder (110);
• a mixing step of, after the melting step, rotating the cylinder (110) by 180° so that the dies (130) face downwards and then stopping the supply of electricity to the heating wire (140) so that the melt becomes a gel state and the white charcoal powder is uniformly mixed while floating;
• and
• an extrusion cutting step of, after the mixing step, lowering the piston (120) so that the gel-state melt is extruded in the form of noodles through the dies (130) and cutting the extruded melt with a cutter to form pellets (P);
• and
• wherein the antibacterial additive comprises, based on 100 parts by weight of the mixture, 0.5 to 2 parts by weight of natural zeolite, 0.5 to 1 part by weight of colloidal nano-sized silver, and 2 to 5 parts by weight of the white charcoal powder;
• or
• wherein the antibacterial additive comprises, based on 100 parts by weight of the mixture, 0.5 to 2 parts by weight of natural zeolite, 0.5 to 1 part by weight of any one selected from among triclosan (5-chloro-2-(2,4-dichlorophenoxy) phenol) and polyhexamethylene biguanide hydrochloride, and 2 to 5 parts by weight of the white charcoal powder.