| abstract |
Provided are a high-uniformity coloured polyester industrial yarn and a preparation method therefor. A raw material of the high-uniformity coloured polyester industrial yarn is a modified polyester composed of a terephthalic acid chain segment, an ethylene glycol chain segment and a dihydric alcohol chain segment containing a branched chain. The preparation method for the high-uniformity coloured polyester industrial yarn involves: carrying out an esterification reaction of terephthalic acid and a dihydric alcohol containing a branched chain under the catalysis of a concentrated sulphuric acid to obtain a dihydric alcohol terephthalate; then, formulating terephthalic acid and ethylene glycol, and carrying out an esterification reaction to obtain ethylene glycol terephthalate; finally, stirring and mixing the two, and under the action of a catalyst and a stabilising agent, carrying out a polycondensation reaction in a low vacuum stage and a high vacuum stage to prepare the modified polyester; and metering the modified polyester, adding a black master batch, performing porous spinneret plate extrusion, and cooling, oiling, stretching, heat setting and winding same to prepare the high-uniformity coloured polyester industrial yarn. |