Black polyester chip and method for preparing black polyester chip

Abstract

The invention discloses a black polyester slice and a preparation method thereof, in particular to the black polyester slice prepared by adding treated carbon black color paste during the esterification reaction or before the ester-exchange reaction, and a preparation method thereof. In the invention, glycol solvent is adopted to dissolve the carbon black and the carbon black color paste is prepared in a high-speed emulsifying machine by adding dispersant; the carbon block color paste is added in the esterification reaction or before the ester-exchange reaction; finally condensation polymerized catalyst is added; the temperature of the product is raised under a certain vacuum condition until a qualified limiting viscosity number is reached, and the black polyester slice is obtained after discharging. The black polyester slice prepared through the method can directly be used to prepare black polyester fiber or black polyester film, does not need to be dyed and pollute the environment, and can meet the requirements of industries, such as spinning, packaging, electronics, etc.

Description

technical field [0001] The invention relates to a black polyester chip and a method for preparing the black polyester chip, in particular to adding treated black color paste in the polyester polymerization process to prepare the black polyester chip and its preparation method. Background technique [0002] Polyester is widely used in plastics, textiles, chemical industry and other fields, but as a hydrophobic material, polyester dyeability has always been problematic. Because of its good light stability, black polyester has a large market in many fields such as plastics, photosensitive, textiles, etc., but it is difficult to obtain ideal results by using conventional dyeing methods to prepare black polyester. [0003] At present, the preparation of black polyester can be dyed by directly adding black dye during the post-processing of polyester chips. US7018429 describes a dyeing method for synthetic materials. First, a colorant is introduced into the polymer melt as a dyein...

AI Technical Summary

Problems solved by technology

JP10067881 specifically introduced the preparation method of carbon black used to prepare black polyester to solve the problem of carbon black dispersion. X-ray fluorescence analysis method was used to determine the content range of S, Ca and Cl elements in carbon black, and obtained a good dispersion. This method has processed the carbon black in advance, but due to the special method, it is not suitable for practical operation

EP0263412 describes the wet oxidation treatment of carbon black after gas phase oxidation, and the treated carbon black is used as a colorant to coat and dye polyester filaments. This method is complicated in process, and the black color is easy to fall off and difficult to maintain.

In US20030105214, polyester is stirred and esterified in an inert gas-closed container, and the esterified product is mixed with carbon black dispersed in low-fat diol, and a phosphorus or titanium compound is added as a catalyst, and finally the polyester that meets the viscosity requirement is Extrusion granulation, this method requires high technology and the process is very complicated, so due to the high temperature in the reactor (esterification temperature 220°C-260°C), the ethylene glycol contained in the carbon black slurry liquid (boiling point 196°C) ) instant volatilization, resulting in the agglomeration of carbon black particles, poor dispersion of carbon black, resulting in many small black spots on the surface of polyester chips