Preparation method of functional high-viscosity slice for monofilaments

Abstract

The invention discloses a preparation method of a functional high-viscosity slice for monofilaments. The functional high-viscosity slice is prepared by using diacid and diols as raw materials, producing a functional low-viscosity polyester slice with the intrinsiclimiting viscosity not more than 0.70 dl / g by utilizing a PTA (Purified Terephthalic AcidPreferential Trade Agreement) method and producing a functional high-viscosity slice with the intrinsiclimiting viscosity ranging from 0.76 dl / g to 1.2 dl / g for monofilaments through continuous solid-phase polycondensation. The functional high-viscosity slice for the monofilaments, which is produced by using the method, has stable performance, excellent quality and stable color additive content adjustable in a certain range. The slice can be directly used for stretching and controlling monofilaments, without adding a color-adjusting master batch slice. The invention is also convenient to control a downstream user production process, improve the stability of monofilament production and decrease the generation of scraps so as to decrease the production cost of downstream users.

Description

technical field [0001] The invention relates to a method for preparing a high-viscosity polyester chip, in particular to a method for preparing a functional high-viscosity chip for monofilament. Background technique [0002] High-viscosity polyester chips are widely used in many fields such as polyester industrial yarn, industrial monofilament, packaging bottles, and packaging boxes. [0003] The manufacture of high-viscosity polyester chips is generally completed in two steps: one is produced under the reaction conditions of the liquid phase by the PTA method or the DMT method (where PTA means purified terephthalic acid, and DMT means dimethyl terephthalate). Ordinary low-viscosity polyester chips whose intrinsic viscosity does not exceed 0.70dl / g; secondly, ordinary low-viscosity polyester chips are used as raw materials to produce high-viscosity polyester chips with intrinsic viscosity exceeding 0.76dl / g through solid-state polycondensation method . [0004] Ordinary lo...

AI Technical Summary

Problems solved by technology

Generally, the viscosity of color masterbatch slices is low, and the viscosity of raw materials will decrease after mixing with high-viscosity polyester chips, and the uneven mixing will cause the content of color additives to be unstable, which will affect the uniformity of monofilament strength and color, and the quality of monofilaments. Difference

In addition, many factors such as high cost of color masterbatch slices and their addition, poor product quality stability, low strength, high scrap rate, and many wastes from production conversion lead to high production costs.

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