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Superfine denier polyamide short fibre and producing method thereof

A production method and polyamide technology, applied in fiber processing, conjugated synthetic polymer artificial filament, filament/thread forming, etc., can solve problems such as unstable physical performance indicators, inability to form sea-island structures, and organic matter discharge environment , to achieve the effects of easy dyeing, stable structure, and reduced emissions

Active Publication Date: 2008-12-31
WUXI DOUBLE ELEPHANT MICRO FIBER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the subsequent reduction process, polyester is dissolved in lye to generate terephthalic acid, which is difficult to recycle, resulting in the discharge of a large amount of organic matter and environmental pollution, which has become the biggest obstacle to this technology
Kuraray Corporation of Japan has developed a superfine fiber mixed melt spinning technology in which the polyamide is the island and the polyester is the sea. This technology mixes the two components and enters the same screw to form a sea-island structure through different mixing degrees. The unstable island structure of the technology leads to unstable physical performance indicators and poor dyeing performance of the fiber after weight reduction. The island component (effective component) content is less than 60% (more than 60% will not be able to form a clear sea island structure)

Method used

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  • Superfine denier polyamide short fibre and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] PA6 / LDPE (MI=50) spinning process

[0077] The PA6 pump supply is 13.5g / min, the melt spinning temperature is 220-270°C, the screw speed is 12r / min, and the screw pressure is 70kg / cm 3 .

[0078] LDPE pump supply is 9.56g / min, melt spinning temperature is 170-275°C, screw speed is 21-22r / min, screw pressure is 52-62kg / cm 2 .

[0079] The spinning speed is 300m / min. After the spinning is normal, continue to increase the spinning speed to 600m / min and 800m / min to wind smoothly. Fuzz appears when the spinning speed is increased to 900m / min, so the spinning speed should be controlled below 800m / min.

[0080] The above-mentioned winding yarn with a spinning speed of 300m / min is stretched 2.5 times, the fiber breaking strength is 2.26CN / dtex, and the breaking elongation is 145.5%. Stretched 3 times, the fiber breaking strength is 2.73CN / dtex, and the breaking elongation is 121.7%. Stretched 3.5 times, the fiber breaking strength is 3.28CN / dtex, and the breaking elongatio...

Embodiment 2

[0083] PA6 / LDPE (MI=50) spinning process

[0084] The PA6 pump supply is 13.5g / min, the melt spinning temperature is 220-270°C, the screw speed is 12r / min, and the screw pressure is 97kg / cm 3 .

[0085] LDPE pump supply is 11.5g / min, melt spinning temperature is 170-275°C, screw speed is 29r / min, screw pressure is 60kg / cm 2 .

[0086] The above spinning process stretches 3.5 times, the fiber breaking strength is 3.05CN / dtex, and the breaking elongation is 122.7%. Bundle the above coiled filaments into 40,000 deniers, pass through the oil immersion tank (the concentration of oil agent is 8-10%), enter the first and second drafting rollers for room temperature stretching, and then the filament bundles enter the crimping machine through a 70°C preheating box . The crimped tow is relaxed and shaped for 10 minutes at a drying temperature of 70-75°C by a chain plate dryer, and then cut by a cutting machine. The number of crimps is 11.5 pieces / 25mm.

Embodiment 3

[0088] PA6 / LDPE(MI=38) spinning industry sesame

[0089] The PA6 pump supply is 13g / min, the melt spinning temperature is 220-270°C, the screw speed is 12-13r / min, and the screw pressure is 67kg / cm 3 .

[0090] The LDPE pump supply rate is 8.5g / min, the melt spinning temperature is 170-275°C, and the screw speed is 29r / min. The ratio is 115.6%, the fiber PA6 content is 60%, the fiber strength is high, and the elongation is large. The product is extracted with toluene, the sea component is dissolved, and the island monofilament fineness is 0.3dtex.

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Abstract

The invention relates to a chemical fiber, in particular to a superfine denier polyamide short fiber as well as a production method thereof. The fiber is a sea-island short fiber taking low density polyethylene as a sea component and polyamide as an island component, and is characterized in that: the polyamide and the low density polyethylene are in a weight ratio of 1:0.4 to 2.3, and the filament titer is 0.05 to 0.3dtex after the island is separated. The sea-island filament titer is 3.0 to 6.0dtex, the fiber breaking strength is between 2.2 and 4.2CN / dtex, and the elongation at break is 100 to 160 percent. The chemical fiber can stabilize the structure and properties of the sea-island fiber, and is easy in dyeing, and the content of effective constituents of the sea-island components is increased.

Description

technical field [0001] The invention relates to a chemical fiber, in particular to a superfine denier polyamide staple fiber and a production method thereof. Background technique [0002] Sea-island composite fiber is a new technology for manufacturing superfine fibers. It is a polymer distributed in another polymer (called sea) in the form of multiple extremely fine microfibers (called islands). . After such fibers are made into woven or knitted fabrics, the sea component is dissolved, and the island component microfibers left in the fabric become superfine fibers. The island-in-the-sea composite fiber is melted by two polymers through a twin-screw composite spinning machine, enters the island-in-sea spinneret assembly, passes through their respective flow channels, meets at the entrance of the spinneret hole, and is extruded together. The production of superfine fibers such as polyester and nylon by the sea-island method has been produced as early as the 1970s. But in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/12D01F8/06D01D5/30
Inventor 顾宇霆陆伟尉雷刘安秦李学彦石祥硌金梅
Owner WUXI DOUBLE ELEPHANT MICRO FIBER MATERIAL
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