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Anti-attenuation low-melting-point polyester chip prepared by one-step spinning method and preparation method of anti-attenuation low-melting-point polyester chip

A low-melting polyester, spinning technology, applied in the direction of one-component copolyester rayon and other directions, can solve the problems of de-orientation effect, poor thermal crystallization performance, strength attenuation, etc.

Pending Publication Date: 2021-05-11
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 110℃ low-melting point series polyester products are mainly used in the hot-melt bonding process of 3D flying woven shoes, etc. During the use process, the chips need to be spun into filaments. Since the low-melting point polyester chips contain a large amount of isophthalic acid components, the molecular Chain regularity leads to poor thermal crystallization effect in the spinning process and severe attenuation of tow strength. After 24 hours of spinning, the tow strength will decrease by 40% to 50%, which seriously affects the use effect
In order to solve the problem of strength attenuation after spinning, a two-step spinning method is generally used. First, POY yarn is spun at a low speed (2100-2500m / min), and then DTY yarn is made into DTY yarn by flat drawing, twisting and heating. The whole processing cycle is long. ,high cost
In recent years, the one-step spinning efficiency has been greatly improved, but the one-step spinning speed of low melting point filaments is controlled at 3100-3500m / min. After being placed, there will be a disorientation effect, and the strength of the final product will be greatly attenuated, which will affect subsequent use

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Anti-attenuation low-melting-point polyester chip prepared by one-step spinning method and preparation method of anti-attenuation low-melting-point polyester chip
  • Anti-attenuation low-melting-point polyester chip prepared by one-step spinning method and preparation method of anti-attenuation low-melting-point polyester chip
  • Anti-attenuation low-melting-point polyester chip prepared by one-step spinning method and preparation method of anti-attenuation low-melting-point polyester chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the anti-attenuation type low-melting point polyester chip in the present embodiment is as follows:

[0029] Step 1, one esterification

[0030] Step 1.1. Add 558kg of IPA and 400kg of DEG (alkyd molar ratio: 1.12) to the slurry preparation kettle. After stirring evenly, add the esterification kettle through a metering pump to carry out the esterification reaction. The esterification temperature is controlled at 235-240 ℃, the esterification pressure is controlled at normal pressure, and the esterification reaction of DEG and part of IPA is completed when the esterification water is received to 109 kg (90% esterification rate).

[0031] Step 1.2, after stirring the remaining 1642kg of IPA, 5500kg of PTA, 500kg of adipic acid and 3455kg of EG (alcohol-acid molar ratio 1.2) evenly, add an esterification kettle through a metering pump to carry out the esterification reaction, the esterification temperature The temperature is controlled at 235-240...

Embodiment 2

[0040] The preparation process of this example is the same as Example 1, the difference is that in Example 1, the total amount of adipic acid is 500kg, PEG-800 is 250kg, and EG is 3455kg; in this example, the total amount of adipic acid is 150kg, PEG- 800 is 300kg, the total amount of EG is 3275kg, and the remaining distribution esterification process, alkyd acid molar ratio, and auxiliary agent dosage are all carried out according to Example 1.

Embodiment 3

[0042] The preparation process of this example is the same as Example 1, the difference is that in Example 1, the total amount of adipic acid is 500kg, PEG-800 is 250kg, and EG is 3455kg; in this example, the total amount of adipic acid is 80kg, PEG- 800 is 80kg, the total amount of EG is 3239kg, and the rest of the distribution esterification process, alkyd molar ratio, and auxiliary agent dosage are all carried out according to Example 1.

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Abstract

The invention discloses ananti-attenuation low-melting-point polyester chip prepared by a one-step spinning method and a preparation method of the anti-attenuation low-melting-point polyester chip. According to the method, terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, polyethylene glycol, adipic acid and the like are used as raw materials, and the polyester chip is prepared through step-by-step esterification and step-by-step polymerization. Through formula improvement and innovation and technological process optimization, accurate regulation and control of a condensed state structure of a product are realized, rapid establishment of a local ordered state of a molecular chain in a one-step filament spinning process is met, a small quantity of oriented folded chain crystals are formed, strength attenuation of spun filaments within 72 hours is less than 10%, long-time storage can be realized, the hot-melt bonding temperature is 150-170 DEG C, the comprehensive use performance is excellent, and the use effect in the fields of 3D flyknit, hot melt bonding and the like is good.

Description

technical field [0001] The invention relates to a one-step spinning method anti-attenuation type low-melting point polyester chips and a preparation method thereof, belonging to the field of differential polyester manufacturing. Background technique [0002] Ordinary PET polyester has a melting point of 250-260°C, and low-melting-point polyester has a melting point of 105-210°C. It changes the molecular structure of PET by copolymerizing modified monomers to achieve the effect of lowering the melting point. At present, the mainstream models with low melting point in the market are 110°C, 180°C and 210°C. Among them, 110°C products can be spun into filaments or short fibers and are mainly used in the field of thermal bonding of non-woven fabrics and 3D flying shoes, and 180°C products are mainly used in In the field of spinning sheath-core composite yarn, 210°C products are mainly used in the field of polyester masterbatch manufacturing. According to the formula △T=△H / △S, it...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/78D01F6/84
CPCC08G63/672C08G63/78D01F6/84
Inventor 许宏平高峰於仁荣徐冬生施斌欧阳勇军钱勇军张龙
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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