Preparation method of low-melting-point PBT copolyester fiber
A copolyester, low melting point technology, applied in the polyester field, can solve the problems of poor molding, poor crystallization performance, poor processing performance, etc., and achieve the effects of lowering melting point, improving fluidity, and improving impact strength
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Embodiment 1
[0020] Example 1: In a 2.5L polymerization reactor, 270 grams of 1,4-butanediol (BDO), 300 grams of terephthalic acid (PTA), 130 grams of hexanediol, and isophthalic acid (IPA) were added successively. 80 grams, 0.34 grams of tetrabutyl titanate. Fill the reaction kettle with nitrogen to 0.1MPa, and then discharge it from the rectification column, repeat the replacement 3 times, set the temperature to heat, and carry out the esterification reaction at 190 ° C ~ 230 ° C under normal pressure conditions, esterification 3.5-4 hours , when the water output reaches 160-180mL, close the rectification column, open the vacuum system, gradually open the vacuum valve, and transition from low vacuum to high vacuum within 45 minutes. The internal temperature rises to 250°C to 260°C, and the polymerization reaction is carried out under this condition. The polymerization time is 100 minutes to 180 minutes. When the polymerization kettle reaches the predetermined current power, the reaction ...
Embodiment 2
[0022] Embodiment 2: In a 2.5L polymerization reactor, add 1,4-butanediol (BDO) 240 grams successively, terephthalic acid (PTA) 290 grams, diethylene glycol 100 grams, adipic acid 70 grams and titanium Acid tetrabutyl ester 0.34 gram, reaction condition is identical with embodiment 1, prepares fusing point and is 186 ℃, and intrinsic viscosity [η] is the copolyester of 0.838dl / g.
[0023] The prepared low-melting point PBT copolyester chips were dried at 140°C for 10 hours, then melt-spun on a single-screw spinning machine with a spinning temperature of 225°C and a spinning speed of 1600m / min, and oiled after cooling. , Equilibrium, winding and drawing after treatment to low melting point PBT fiber.
Embodiment 3
[0024] Embodiment 3: in 2.5L polymerization reactor, add 1,4-butanediol (BDO) 220 grams successively, terephthalic acid (PTA) 280 grams, neopentyl glycol 120 grams, succinic acid 80 grams and 0.34 g of tetrabutyl titanate, the reaction conditions were the same as in Example 1, and a copolyester with a melting point of 167° C. and an intrinsic viscosity [η] of 0.885 dl / g was prepared.
[0025] The prepared low-melting point PBT copolyester chips were dried at 140°C for 8 hours, then melt-spun on a single-screw spinning machine with a spinning temperature of 210°C and a spinning speed of 1500m / min, and oiled after cooling , Equilibrium, winding and drawing after treatment to low melting point PBT fiber.
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