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Sea-island fiber with PA6 as island components, preparation method thereof, and ultrafine fiber formed by sea-island fibers

A sea-island fiber and ultra-fine fiber technology, applied in fiber processing, single-component polyamide rayon, melt spinning, etc., can solve the problems of low recycling value of polyvinyl alcohol aqueous solution, environmental pollution, waste of resources, etc.

Active Publication Date: 2020-10-02
上海市合成纤维研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The hot water dissolving type (hot water dissolving method) is disclosed in CN108589028A, CN108589028A, CN108505190A, CN108589028A, CN108486683A and CN108424601A, adopting polyvinyl alcohol (PVA) as the sea phase of sea-island fibers, if the island component is PA6, there are two sea-island fibers The temperature difference of phase spinning is large (temperature difference > 80 ℃), and it is difficult to spin on ordinary sea-island spinning equipment. In addition, the existence of water must be avoided in the process of drawing, post-drawing, and application before fiber opening, otherwise the fiber will be damaged. Bonding occurs, seriously affecting the performance of the fiber
The recovery and reuse value of the polyvinyl alcohol aqueous solution after fiber opening is low, and if it is directly discharged, it will cause a waste of resources
In addition, the PVA sea components disclosed in the above-mentioned patents contain additives such as polyols or salt compound modifiers, antioxidants and lubricants (the total content accounts for at least 15% of the sea components), all of which increase the treatment of fiber-opening wastewater. difficulty and cost
[0007] To sum up, the sea-island fibers that can be mass-produced on the market have certain defects and are accompanied by irreversible environmental pollution.
At present, there is no one that can achieve value preservation or high value-added recycling, and can be non-toxic and zero-emission in the recycling process, and at the same time can be well matched with various high-polymer PET, PA6, PP, etc. component exists

Method used

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  • Sea-island fiber with PA6 as island components, preparation method thereof, and ultrafine fiber formed by sea-island fibers
  • Sea-island fiber with PA6 as island components, preparation method thereof, and ultrafine fiber formed by sea-island fibers
  • Sea-island fiber with PA6 as island components, preparation method thereof, and ultrafine fiber formed by sea-island fibers

Examples

Experimental program
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Effect test

preparation example Construction

[0070] More specifically, the preparation method of the modified polyester comprises:

[0071] 1) Ethylene glycol and terephthalic acid undergo esterification reaction; the temperature of the esterification reaction is 240-270°C; the time of the esterification reaction is 2-4h;

[0072] 2) Add isophthalic acid dibasic acid ester-5-sodium sulfonate or isophthalic acid dibasic acid ester-5-potassium sulfonate, and add 2-methyl-1,3-propanediol and 1,3- Propylene glycol is transesterified; the temperature of the transesterification reaction is 240-270°C; the time of the transesterification reaction is 1-3h;

[0073] 3) adding catalyst and heat stabilizer to carry out polycondensation reaction; the temperature of polycondensation reaction is 270-300°C; the time of polycondensation reaction is 2-4h; the catalyst is antimony trioxide; the heat stabilizer is trimethyl phosphate or phosphoric acid Triphenyl ester; the added amount of the heat stabilizer is 0.02% to 0.06% of the mass o...

Embodiment 1

[0077] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:2.0:0.05:0.10:0.08, and the modified copolyester is formed by the above-mentioned method.

[0078] In this embodiment, the sea component of the sea-island fiber uses the modified copolyester as described above, and the island component uses PA6. In this embodiment, the mass ratio of the sea component to the island component is 1:7.

[0079] Using melt composite spinning technology, the island component PA6 is fed into the first screw extruder for melt extrusion, and at the same time, the sea component modified copolyester is fed into the second screw extruder for extrusion; the first The temperature in the five zones in the screw extruder is 265°C-270°C, 270°C-275°C, 275°C-280°C, 275°C-280°C, 270°C-275°C; the temperature in the five zones in the second screw extruder is 2...

Embodiment 2

[0083] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:1.5:0.03:0.05:0.10, and the modified copolyester is formed by the above-mentioned method.

[0084] In this embodiment, the sea component in the sea-island fiber adopts the modified copolyester as described above, and the island component adopts semi-dull PA6 and black PA6 masterbatches. The mass ratio of the sea component to the island component in this embodiment is 1:5.

[0085] Using melt composite spinning technology, the island component semi-dull PA6 and black PA6 masterbatches are blended with a dispersant, and the blending ratio is 7:3. After mixing evenly, they are fed into the first screw extruder for melt extrusion. At the same time, Feed the sea component modified copolyester into the second screw extruder for extrusion; the temperature in the five zones of th...

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Abstract

The invention provides a sea-island fiber with PA6 as island components, a preparation method thereof, and an ultrafine fiber formed by the sea-island fibers. According to the sea-island fiber with PA6 as the island components, modified copolyester is used as sea components. By using the modified copolyester as the sea components of the sea-island fiber and using PA6 as island materials, the sea-island fiber is good in spinnability; because of the properties of the modified copolyester, the sea-island fiber can be split in a mild condition which does not affect the physical and chemical properties of the island components PA6, and thus, the performance of the ultrafine fiber with PA6 as the island components is not damaged.

Description

technical field [0001] The invention relates to the technical field of superfine fibers, in particular to a sea-island fiber with PA6 as an island component and a preparation method thereof. Background technique [0002] Sea-island fiber is to disperse one polymer in another polymer. The dispersed phase in the fiber cross-section is in the state of "island", while the matrix corresponds to the "sea". From the cross-section of the fiber, it is a kind of composition in the form of fine And the scattered state is surrounded by another component, as if there are many islands in the sea. [0003] The island-in-the-sea fiber adopts composite spinning technology to use two fiber-forming polymers as "island" and "sea" components respectively, and melt-spins them according to different ratios, and then utilizes the different chemical solvents of these two components. Solubility or decomposability, remove the "sea" component and leave the "island" component to obtain ultrafine fibers...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01F8/12C08G63/688D01F11/08D01F6/60D01D5/30D01D5/08
CPCD01F8/14D01F8/12C08G63/6886D01F11/08D01F6/60D01D5/30D01D5/08Y02P70/62
Inventor 付昌飞李赛解德诚邢亚均石浩然顾进魏怡雯薛丽云曹伟新钱桢英崔厚平
Owner 上海市合成纤维研究所有限公司
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