Low-shrink polyester industrial yarn and its manufacturing method

摘要

The present invention relates to a low-shrink polyester yarn and a manufacturing method thereof, wherein the manufacturing method proceeds to viscosify, melt, meter, extrude, cool, oil ring, draw, heat-set and wind-up the modified polyester by solid state polycondensation. Here, the oil for oiling contains crown ether, and the content of crown ether is 67.30 to 85.58 wt%. The manufacturing method of the present invention is simple and reasonable, and the finally manufactured low-shrink polyester industrial yarn has a dry shrinkage rate of 2.5 to 4.7% under conditions of 190°C, 15 minutes and 0.01 cN/dtex, and the material is modified polyester, modified The molecular chain of polyester includes a terephthalic acid chain segment, an ethylene glycol chain segment, and a branched dihydric alcohol chain segment, and the structural formula of the branched dihydric alcohol is as follows, (I) In formula (I), R ₁ and R ₂ are each independently selected from a linear alkylene group having 1 to 3 carbon atoms, R ₃ is selected from an alkyl group having 1 to 5 carbon atoms, and R ₄ has 2 carbon atoms It is selected from an alkyl group of 5 to.