Preparation method of antibacterial 1,3-polytrimethylene terephthalate

The invention discloses a preparation method of antibacterial 1,3-polytrimethylene terephthalate. The preparation method comprises an esterification reaction stage and a condensation polymerization reaction stage, wherein during a pressurization stage of the condensation polymerization reaction stage, the nitrogen is filled to maintain the pressure to be 0.02-0.06 MPa for adding an antibacterial agent, the temperature is 220-230 DEG C, and the time is 0.3-0.5 hour; and the antibacterial agent is a soluble glass carrier additive containing silver ions, the average particle size is 0.8-0.9 micron, and the maximum particle size is less than or equal to 1 micron. According to the preparation method disclosed by the invention, the antibacterial agent is added at the condensation polymerization reaction stage, and is beneficial for uniform dispersion of antibacterial active ingredients under a pressure condition to ensure that the prepared antibacterial 1,3-polytrimethylene terephthalate modified polyester chips are low in manufacturing cost and excellent in product performance, and simply have functions of inhibiting and killing bacteria in a spinning processing technology to realize a novel manufacturing method of polyester cut particles; and moreover, the antibacterial components of the prepared antibacterial 1,3-polytrimethylene terephthalate modified polyester chips are uniformly dispersed, a post processing technology is simple, and the adding of antibacterial powder does not influence physical properties of the polyester cut particles, so that industrial production can be realized easily.