The invention discloses a
polyester chip for producing a vehicle-mounted perfume rod and a
fiber pen point and a preparation method thereof. The preparation method comprises the steps that firstly, the
polyester chip meeting the technological requirement is synthesized, specifically, a semi-
continuous production synthesis device is adopted, and an acid isomer and an
alcohol homologue are introduced in the
esterification reaction process to improve the melting range of a product; then, a dihydric
alcohol alcoholysis and blending melting control process is adopted in the secondary
esterification reaction, and a modification additive is prepared into a liquid mixture capable of participating in
polymerization, so that the final
crystallization property of the product is improved; finally, the target
polyester chip base material is synthesized with the
intrinsic viscosity of 0.700-0.730 dl / g by compounding a catalyst by controlling the
reaction temperature and the vacuum degree; and
solid-phase
crystallization is carried out on the synthesized product to complete pre-
crystallization of polyester chips, and then the polyester chips are dried under the conditions of program
temperature control,
vacuum state and the like, wherein the
moisture content of the dried polyester chips is not higher than 0.05%, and the
intrinsic viscosity is not lower than 0.670 dl / g to produce the polyester chips meeting the production requirements of vehicle-mounted perfume rods and
fiber pen points.