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

Inactive Publication Date: 2019-04-05
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a new environmentally friendly and healthy adhesive material, low-melting-point fibers avoid the use of chemical adhesives in the production of hollow non-woven fabrics, and are more and more welcomed and recognized by downstream enterprises of chemical fibers. At present, the research on low-melting point polyesters at home and abroad mainly focuses on PET polyester is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a preparation method of a low-melting-point PBT copolyester fiber, which comprises the following steps: butanediol is used as a raw material, a direct esterification method is adopted, dibasic acid and dihydric alcohol monomers with the molar ratio of 1:1.5-1:2.5 are simultaneously added, esterification, prepolymerization and polymerization reaction are carried out under theaction of a catalyst, and the PBT copolyester with the melting point ranging from 140 DEG C to 190 DEG C is prepared, wherein the esterification reaction and the prepolymerization reaction are carried out in two stages. The prepared PBT polyester is subjected to melt spinning after being dried, and is subjected to oiling, balancing, winding and drafting after being cooled. According to the preparation method of the low-melting-point PBT copolyester fiber,, dibasic acid and dihydric alcohol monomers are simultaneously added in the polymerization process of the PBT, and the esterification and prepolymerization reaction processes are carried out in stages, so that the melting point of the PBT is reduced, the fluidity of the PBT melt is improved, the toughness of the PBT is increased, the impact strength is improved, the prepared low-melting-point PBT polyester fiber has the advantages of low modulus, high elasticity and good hand feeling, and can also be used as a substitute adhesive torealize the bonding function.

Description

technical field [0001] The invention relates to a polyester, in particular to a preparation method of a PBT copolyester fiber. Background technique [0002] Low-melting point copolyester is a polyester with a lower melting point (90-240°C) obtained by chemically modifying ordinary polyester. Because its structure is similar to that of ordinary polyester, it retains the common polyester Part of the properties of esters, with good compatibility. This modified copolyester not only has low melting point, good fluidity, but also moderate price, so it is extremely versatile. At present, the research on low-melting-point polyester at home and abroad mainly uses PET polyester for copolymerization modification, and there are few studies on PBT copolymerization-modified low-melting point polyester. The crystallization speed of PBT polyester is very fast, the crystallinity is high, and the processability is excellent. Therefore, the low-melting point PBT product modified with PBT pol...

Claims

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Application Information

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IPC IPC(8): D01F6/84C08G63/183C08G63/181C08G63/672
CPCC08G63/181C08G63/183C08G63/672D01F6/84
Inventor 张建李晶闻秀银陈海燕
Owner SINOPEC YIZHENG CHEM FIBER
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