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

Active Publication Date: 2017-06-09
扬州富威尔复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the low-melting-point polyester melting point high of prior art crystalline low-melting-point polyester fiber, the melting speed is slow and the total content of acetaldehyde and acrolein in the crystalline low-melting-point polyester fiber is high, and realizes Large-scale production, providing a kind of crystalline low melting point polyester fiber and its preparation method

Method used

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  • Crystallinity low-melting point polyester fiber and preparation method thereof
  • Crystallinity low-melting point polyester fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a crystallinity low-melting point polyester fiber and a preparation method thereof; the crystallinity low-melting point polyester fiber is a belt core structure, wherein a belt layer is a low-melting-point polyester, and a core layer is PET; the low-melting point polyester fiber consists of terephthalic acid chain section, isophthalic acid chain section, 1, 3-propylene glycol chain section, dipropylene glycol chain section and molecular weight modifier, wherein the molecular weight modifier corresponding to the molecular weight modifier chain section is 1, 8-naphthalic acid, phthalic acid, 1, 2-cyclopentane dioctyl phthalate, 1, 2-cyclohexane dioctyl phthalate or corresponding dimethyl ester or diethyl ester. The preparation method includes low-melting-point polyester polymerization and belt core composite spinning, wherein post spinning adopts drafting-water washing technique, and drafting adopts oil bath drafting added with sodium sulfite; through rolling, cutting and drying, the crystallinity low-melting point polyester fiber is acquired. The crystallinity low-melting point polyester fiber prepared by the invention is low in melting point, and low in total content of acetaldehyde and acrolein.

Description

technical field [0001] The invention belongs to the field of crystalline low-melting polyester fibers, and relates to a crystalline low-melting polyester fiber and a preparation method thereof, in particular to a crystalline low-melting polyester fiber with low total content of acetaldehyde and acrolein and its preparation method. Background technique [0002] At present, the non-woven fabric industry is developing rapidly, especially the polyester non-woven fabric industry needs a polymer with a melting point lower than ordinary polyester, but has good compatibility with ordinary polyester as a thermal bonding fiber. Modification of ordinary polyester to prepare low melting point polyester. [0003] Low-melting point copolyester is a polyester with a lower melting point obtained by chemically modifying ordinary polyester. Because its structure is similar to that of ordinary polyester, it retains some of the characteristics of ordinary polyester. Ordinary polyester has goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/14C08G63/672D01D5/34D01D5/092D01D5/14
CPCC08G63/672D01D5/092D01D5/14D01D5/34D01F8/14
Inventor 朱兴荣詹勇余小平
Owner 扬州富威尔复合材料有限公司
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