Crystallinity low-melting point polyester fiber and preparation method thereof
A low melting point polyester, crystalline technology, applied in fiber processing, stretch spinning, conjugated synthetic polymer artificial filament, etc., can solve the problem of high melting point, slow melting speed, total content of acetaldehyde and acrolein Advanced problems, to achieve the effect of low melting point temperature, fast melting speed and fast curing speed
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Embodiment 1
[0049] A preparation method of crystalline low melting point polyester fiber:
[0050] a) low melting point polyester polymerization;
[0051] (1) Esterification reaction;
[0052] After preparing terephthalic acid, isophthalic acid, 1,3-propylene glycol, dipropylene glycol, and 1,8-naphthalene dicarboxylic acid into a slurry, carry out esterification reaction, pressurize the reaction under nitrogen atmosphere, pressurize The pressure is normal pressure and the 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 point of the esterification reaction, and the esterification product is obtained; among them, terephthalic acid, isophthalic acid The molar ratio of formic acid, dipropylene glycol and 1,3-propanediol is 1:0.3:0.1:1.8; the addition amount of 1,8-naphthalene dicarboxylic acid is 3% of the mole number of phthalic acid.
[0053] (2) polycondensation reaction;
[0054] Then...
Embodiment 2
[0065] A preparation method of crystalline low melting point polyester fiber:
[0066] a) low melting point polyester polymerization;
[0067] (1) Esterification reaction;
[0068] After preparing terephthalic acid, isophthalic acid, 1,3-propanediol, dipropylene glycol, and phthalic acid into a slurry, carry out esterification reaction, pressurize the reaction under nitrogen atmosphere, and pressurize the pressure at 0.3 MPa, 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; among them, terephthalic acid, isophthalic acid, a The ratio of dipropylene glycol and 1,3-propanediol is 1:0.5:0.3:2.5; the amount of phthalic acid added is 5% of the moles of phthalic acid.
[0069] (2) polycondensation reaction;
[0070] Then, under the action of catalyst and stabilizer, the polycondensation reaction ...
Embodiment 3
[0081] A preparation method of crystalline low melting point polyester fiber:
[0082] a) low melting point polyester polymerization;
[0083] (1) Esterification reaction;
[0084] After preparing terephthalic acid, isophthalic acid, 1,3-propanediol, dipropylene glycol, and 1,2-cyclopentanedicarboxylic acid into a slurry, carry out esterification reaction, pressurized reaction under nitrogen atmosphere, The pressurized pressure is 0.1 MPa, 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 point of the esterification reaction, and the esterification product is obtained; among them, terephthalic acid, m- The ratio of phthalic acid, dipropylene glycol and 1,3-propanediol is 1:0.5:0.2:2; the amount of 1,2-cyclopentanedicarboxylic acid added is 4% of the moles of phthalic acid.
[0085] (2) polycondensation reaction;
[0086] Then, under the action of catalyst and stabilizer...
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