PBT (polybutylene terephthalate) fiber production technology

A production process and fiber technology, which is applied in the field of PBT fiber production process, can solve the problems of incapable mass production and high production cost, and achieve the effects of low production cost, excellent performance and improved reaction efficiency

Inactive Publication Date: 2015-11-25
TAICANG HONGYI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of my country's automobile industry and electronics / electrical industry, the demand for PBT is also growing rapidly, but the production costs of dimethyl terephthalate and butanediol of PBT fibers in the prior art are high, and can only be reduced Large-scale production, cannot be mass-produced, so it cannot meet the needs of the domestic market

Method used

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  • PBT (polybutylene terephthalate) fiber production technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put terephthalic acid and 1,4-butanediol with a purity of 85% in a desiccator and dry at 130°C for 3 hours; weigh the dried terephthalic acid and 1,4-butanediol into the ester Chemical reactor, wherein the molar ratio of terephthalic acid to 1,4-butanediol is 1:2, calcium acetate with a mass of 0.02% of the mass of terephthalic acid and an amount of 0.2% of the mass of terephthalic acid Sodium sulfate, the control temperature is 230 ℃ for esterification reaction 2h; the reaction product is placed in the polycondensation tank, the reaction temperature is 350 ℃, and the polycondensation reaction is carried out under vacuum conditions for 3h, and the PBT polyester is prepared; the prepared PBT The polyester is dried at 120°C for 2 hours, and melt-spun through a screw spinning machine, wherein the spinning temperature is 260°C, and the spinning speed is 1200m / min. After cooling, oiling, balancing, winding, Drawing treatment to obtain PBT fibers.

Embodiment 2

[0021] Put terephthalic acid and 1,4-butanediol with a purity of 80% in a desiccator and dry at 130°C for 3 hours; weigh the dried terephthalic acid and 1,4-butanediol into the ester Reactor, wherein, the molar ratio of terephthalic acid and 1,4-butanediol is 1:2.5, the quality of adding tetraethyl titanate is 0.03% of the mass of terephthalic acid and the amount is 0.03% of the mass of terephthalic acid 0.2% of sodium sulfate, the control temperature is 240 ° C for esterification reaction for 3 hours; the reaction product is placed in a polycondensation kettle, the reaction temperature is controlled at 360 ° C, and the polycondensation reaction is carried out under vacuum for 4 hours to prepare PBT polyester; The obtained PBT polyester was dried at 140° C. for 2 hours, and melt-spun through a screw spinning machine, wherein the spinning temperature was 260° C., and the spinning speed was 1800 m / min. After cooling, oiling, balancing, Winding and drafting treatment to obtain PB...

Embodiment 3

[0023] Put terephthalic acid and 1,4-butanediol with a purity of 90% in a desiccator and dry at 140°C for 2 hours; weigh the dried terephthalic acid and 1,4-butanediol into the ester Chemical reactor, wherein the molar ratio of terephthalic acid to 1,4-butanediol is 1:3, zinc acetate with a mass of 0.04% of the mass of terephthalic acid and an amount of 0.3% of the mass of terephthalic acid Sodium sulfate, the control temperature is 230 ℃ for esterification reaction 2h; the reaction product is placed in the polycondensation tank, the reaction temperature is 350 ℃, and the polycondensation reaction is carried out under vacuum conditions for 3h, and the PBT polyester is prepared; the prepared PBT The polyester is dried at 120°C for 2 hours, and melt-spun through a screw spinning machine, wherein the spinning temperature is 270°C, and the spinning speed is 1500m / min. After cooling, oiling, balancing, winding, Drawing treatment to obtain PBT fibers.

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Abstract

The invention discloses a PBT (polybutylene terephthalate) fiber production technology comprising steps as follows: 1) high-purity terephthalic acid and 1,4-butanediol are placed in a dryer to be dried at the temperature of 120-150 DEG C for 2-3 h, and the purity of the terephthalic acid is 80%-90%; 2) the dried terephthalic acid and the dried 1,4-butanediol are weighed and placed in an esterification reactor, a catalyst and sodium sulfate are added, and an esterification reaction is performed at the temperature of 200-260 DEG C for 2-3 h; 3) a reaction product is placed in a polycondensation kettle, a polycondensation reaction is performed at the reaction temperature of 350-380 DEG C for 2-4 h through stirring under the vacuum condition, and PBT polyester is prepared; 4) the prepared PBT polyester is subjected to melt spinning by a screw type spinning machine, oiling, balancing, winding and drafting treatment are performed after cooling, and PBT fibers are obtained. The PBT fibers prepared with the technology are good in stability and elasticity, low in production cost and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of PBT fibers, in particular to a PBT fiber production process. Background technique [0002] Polybutylene terephthalate (PBT), belonging to the polyester series, also known as thermoplastic polyester plastics, PBT fibers are made of high-purity terephthalic acid or terephthalic acid and 1,4-butanediol The linear polymer polycondensed after esterification, the fiber obtained by melt spinning, belongs to a kind of polyester fiber. PBT fiber has the characteristics of excellent elongation elastic recovery rate and softness and easy dyeing. PBT fiber has some common properties of polyester fiber, but because the flexible part on the basic chain link of PBT macromolecule is longer, the melting point and glass transition temperature of PBT fiber are lower than ordinary polyester fiber, resulting in the fiber macromolecular chain The flexibility and elasticity have been improved. PBT fiber has good durability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62C08G63/183C08G63/78D01D5/08
Inventor 陆国强
Owner TAICANG HONGYI CHEM FIBER
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