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Nylon 56 short fiber and melt direct spinning preparation method thereof

A melt direct spinning and nylon technology, applied in the directions of melt spinning, spinning solution preparation, stretch spinning, etc., can solve the problem of staying in the primary stage, and achieve the effects of short process, stable product and high efficiency

Inactive Publication Date: 2016-08-24
优纤科技(丹东)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for nylon polymers, the melt direct spinning method is still in its infancy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, preparation bio-based nylon 56 short fiber

[0036] (1) Under nitrogen protection conditions, dissolve bio-based pentamethylenediamine in deionized water, gradually add adipic acid, control the molar ratio of bio-based pentamethylenediamine and adipic acid to 1:1.05, and prepare a mass concentration of 40% nylon 56 in saline solution. The prepared nylon 56 saline solution, 1% (the sum of the added mass of bio-based pentamethylenediamine and adipic acid) acetic acid and 1% (the sum of the added mass of bio-based pentamethylenediamine and adipic acid) of bio-based pentamethylene Add the amine together into the reactor, and keep the pressure for 2.5 hours at the temperature of 240°C and the pressure of 1.8MPa. Then the pressure in the reactor was released, and when the temperature rose to 285° C., vacuum was applied to reduce the system pressure to -0.06 MPa, and the system was continuously stirred for 2 hours in a vacuum state to obtain a polyamide 56 polym...

Embodiment 2

[0040] Embodiment 2, preparation bio-based nylon 56 short fiber

[0041] The preparation method is the same as in Example 1, except that the molar ratio of bio-based pentamethylenediamine and adipic acid in Example 1 is changed to 1:1.15 to prepare a 50% nylon 56 saline solution .

[0042] The physical and chemical parameters of the bio-based nylon 56 short fiber prepared by the present embodiment are as follows:

[0043] The melting point is 256°C, the standard moisture regain is 4.5%, the fineness is 3.2dtex, the density is 1.15g / cm3, the breaking strength is 4.5CN / dtex, and the breaking elongation is 14%.

Embodiment 3

[0044] Embodiment 3, preparation bio-based nylon 56 short fiber

[0045] The preparation method is the same as in Example 1, except that the molar ratio of bio-based pentamethylenediamine and adipic acid in Example 1 is changed to 1:1.25 to prepare a 60% nylon 56 saline solution .

[0046] The physical and chemical parameters of the bio-based nylon 56 short fiber prepared by the present embodiment are as follows:

[0047] The melting point is 261°C, the standard moisture regain is 3.6%, the fineness is 5.8dtex, the density is 1.11g / cm3, the breaking strength is 5.2CN / dtex, and the breaking elongation is 12%.

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Abstract

The invention discloses a melt direct spinning preparation method of nylon 56 short fibers. The method includes steps: (1) allowing reaction of bio-based pentamethylene diamine and adipic acid in water under nitrogen protection to obtain a nylon 56 salt solution; (2) adding the nylon 56 salt solution and a molecular weight regulator into a reactor, and keeping the pressure under the condition that the temperature is 210-240 DEG C and the pressure is 1.7-1.85MPa; releasing the internal pressure of the reactor, and heating to 280-290 DEG C; vacuumizing and stirring to obtain nylon 56 polymer melt; (3) feeding the nylon 56 polymer melt into a spinning manifold; subjecting the nylon 56 polymer melt to spinning through a spinneret, cooling, leading to a winding machine to realize finishing and conditioning, and sequentially performing drafting, crimping, finishing, relaxed heat setting and cutting to obtain the nylon 56 short fibers. The melt direct spinning preparation method has advantages of short process, high efficiency and product stability and provides guidance for industrial direct spinning of bio-based nylon and nylon polymers.

Description

technical field [0001] The invention relates to a nylon 56 short fiber and a preparation method thereof by melt direct spinning. Background technique [0002] Bio-based nylon 56 is a new type of bio-based polymer product, which mainly utilizes the biological method CN103147152 discloses the preparation method of bio-based nylon 56, which mainly utilizes lysine in Haffnia hive Decarboxylase acts on lysine, which is a biological method to prepare bio-based pentamethylenediamine, and then synthesized with adipic acid to obtain bio-based nylon 56 products. This polymer has received high attention due to its good hygroscopic properties, flame retardancy, high strength, etc. Therefore, its subsequent product development becomes an important task. The development of bio-based nylon 56 fiber is an important direction. [0003] For thermoplastic polymer fibers, the melt spinning method is the most common and the least expensive method. For melt spinning, there are generally two m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/60D01D1/02D01D1/06D01D5/08D01D5/092D01D5/12D01D7/00
CPCD01F6/60D01D1/02D01D1/065D01D5/08D01D5/092D01D5/12D01D7/00
Inventor 郝新敏鞠景堂赵鹏程樊丽君于广慧孙庆智陈晓
Owner 优纤科技(丹东)有限公司
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