Polyester chip for producing vehicle-mounted perfume rods and fiber pen points and preparation method of polyester chip

Abstract

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.

Description

technical field [0001] The invention relates to a polyester chip and a preparation method thereof, in particular to a polyester chip used in the production of vehicle-mounted perfume sticks and fiber pens and a preparation method thereof. Background technique [0002] The use of low-melting point composite yarn in the production of vehicle-mounted perfume sticks and fiber pens is an emerging application direction. Because it does not use adhesives and is self-adhesive in bundles, it meets the market's requirements for low-carbon environmental protection and has adhesive properties. Good quality, solid and durable, high strength, good water absorption and other advantages, the application range and usage are also expanding year by year, and are recognized by more and more domestic and foreign markets. PET materials have been used in car perfume sticks and fiber pens for a long time, but the main processing technology is adhesive bonding. The reason is that the composite filam...

AI Technical Summary

Problems solved by technology

[0004] 1. Confined bundles of rods or core materials generally require additional binding materials, and the strength is generally not high;

[0005] 2. Compared with the self-adhesive rod or core material of low-melting point composite wire, the rod or core material pressed and formed by adding adhesive has impermeable porosity, poor water conductivity, and poor writing feel;

[0006] 3. The bar or core material pressed and formed by ordinary materials has relatively poor durability, and the problem of cracking and falling off is serious for long-term writing;

[0007] 4. The low-melting-point polyester chips used to produce this new self-adhesive low-melting-point composite yarn are relatively difficult in the production and synthesis process, especially polyester chips for low-melting-point composite yarns below 200°C, which are difficult to dry and easy to dry. Agglomerated and agglomerated, the intrinsic viscosity is easily affected. The traditional low-temperature air-drying method cannot fully dry polyester chips for low-melting point composite yarns, which will cause unstable extrusion pressure, floating yarns, and broken yarns during the spinning process. Good for continuous production