Sea-island fiber adopting PET as island component, preparation method thereof, and superfine fiber formed by sea-island fiber
A sea-island fiber and ultra-fine fiber technology, used in fiber processing, filament/thread forming, textile and papermaking, etc., can solve the problem of spinning, setting temperature and drying temperature not too high, unstable PET island component structure, etc. problem, to achieve good spinnability
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[0068] More specifically, the preparation method of the modified polyester comprises:
[0069] 1) Ethylene glycol and terephthalic acid undergo esterification reaction; the temperature of the esterification reaction is 240-270°C; the time of the esterification reaction is 2-4h;
[0070] 2) Add isophthalic acid dibasic acid ester-5-sodium sulfonate or isophthalic acid dibasic acid ester-5-potassium sulfonate, and add 2-methyl-1,3-propanediol and 1,3- Propylene glycol is transesterified; the temperature of the transesterification reaction is 240-270°C; the time of the transesterification reaction is 1-3h;
[0071] 3) adding catalyst and heat stabilizer to carry out polycondensation reaction; the temperature of polycondensation reaction is 270-300°C; the time of polycondensation reaction is 2-4h; the catalyst is antimony trioxide; the heat stabilizer is trimethyl phosphate or phosphoric acid Triphenyl ester; the added amount of the heat stabilizer is 0.02% to 0.06% of the mass o...
Embodiment 1
[0076] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:2.0:0.05:0.10:0.08, and the modified copolyester is formed by the above-mentioned method.
[0077] In this example, the sea component of the island-in-the-sea fiber uses the above-mentioned modified copolyester, and the island component uses PET. In this example, the mass ratio of the sea component to the island component is 1:7.
[0078] Using melt composite spinning technology, the island component PET is fed into the first screw extruder for melt extrusion, and at the same time, the sea component modified copolyester is fed into the second screw extruder for extrusion; the first The temperature in the five zones in the screw extruder is 275°C-280°C, 280°C-285°C, 285°C-290°C, 285°C-290°C, 290°C-295°C; the temperature in the five zones in the second screw extruder is 250...
Embodiment 2
[0082] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:1.5:0.03:0.05:0.10, and the modified copolyester is formed by the above-mentioned method.
[0083] In this example, the sea component of the island-in-the-sea fiber uses the above-mentioned modified copolyester, and the island component uses PET. In this example, the mass ratio of the sea component to the island component is 1:5.
[0084] Using melt composite spinning technology, the island component PET is fed into the first screw extruder for melt extrusion, and at the same time, the sea component modified copolyester is fed into the second screw extruder for extrusion; the first The temperature in the five zones in the screw extruder is 275°C-280°C, 280°C-285°C, 285°C-290°C, 285°C-290°C, 290°C-295°C; the temperature in the five zones in the second screw extruder is 250℃~...
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