Three-dimensional crimp low-melting-point polyester fiber and preparation method thereof
A low-melting point polyester and three-dimensional crimping technology, which is applied in fiber processing, conjugated synthetic polymer artificial filament, filament/thread forming, etc., can solve the problems of slow melting speed, high melting point, single variety, etc., and achieve The effect of fast melting speed and low melting point temperature
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Embodiment 1
[0048] A preparation method of three-dimensional crimped low-melting polyester fiber:
[0049] a) low melting point polyester polymerization;
[0050] (1) Esterification reaction;
[0051] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, 1,8-naphthalene dicarboxylic acid and 2-pentyl-1,12 dodecanediol into slurry, carry out esterification reaction , pressurized reaction under a nitrogen atmosphere, pressurized pressure is normal pressure, temperature is 230 ° C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end of the esterification reaction, and the esterification product is obtained ; Wherein, the molar ratio of terephthalic acid, isophthalic acid, diethylene glycol, 2-pentyl-1,12 dodecanediol, and ethylene glycol is 1:0.4:0.1:0.05:1.8; 1, The addition amount of 8-naphthalene dicarboxylic acid is 3% of the molar number of phthalic acid.
[0052] (2) polyco...
Embodiment 2
[0064] A preparation method of three-dimensional crimped low-melting polyester fiber:
[0065] a) low melting point polyester polymerization;
[0066] (1) Esterification reaction;
[0067] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, phthalic acid and 2-hexyl-1,12 dodecanediol into a slurry, carry out esterification reaction, in a nitrogen atmosphere Under pressurized reaction, the pressurized pressure is 0.3MPa, and the temperature is 250°C. When the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; wherein, for The molar ratio of phthalic acid, isophthalic acid, diethylene glycol, 2-hexyl-1,12 dodecanediol, and ethylene glycol is 1:0.6:0.3:0.1:2.5; the amount of phthalic acid added It is 4.3% of the moles of phthalic acid.
[0068] (2) polycondensation reaction;
[0069]Then, und...
Embodiment 3
[0080] A preparation method of three-dimensional crimped low-melting polyester fiber:
[0081] a) low melting point polyester polymerization;
[0082] (1) Esterification reaction;
[0083] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, 1,2-cyclopentane dicarboxylic acid and 2-heptyl-12 dodecanediol into slurry, carry out esterification reaction , pressurized reaction under a nitrogen atmosphere, the pressurized pressure is 0.1MPa, the temperature is 240 ° C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end of the esterification reaction, and the esterification product is obtained ; Wherein, the molar ratio of terephthalic acid, isophthalic acid, diethylene glycol, 2-heptyl-12 dodecanediol, and ethylene glycol is 1:0.5:0.2:0.07:2; 1,2- The addition amount of cyclopentane dicarboxylic acid is 4% of the mole number of phthalic acid.
[0084] (2) polycondensa...
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