Satellite type superfine denier polyamide short fibre and producing method thereof

A low-density polyethylene and polyamide technology, applied in fiber processing, filament/thread forming, conjugated synthetic polymer artificial filament, etc., can solve the problem of unstable physical performance indicators, inability to form sea-island structures, and fiber dyeing performance To achieve the effect of easy dyeing, stable structure and simple preparation method

Active Publication Date: 2011-01-19
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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  • Satellite type superfine denier polyamide short fibre and producing method thereof
  • Satellite type superfine denier polyamide short fibre and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] PA6 / LDPE+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] Sea component (PA6:LDPE=1:1) pump supply rate 9.56g / min, melt spinning temperature 170-275°C, screw speed 21-22r / min, screw pressure 52-62kg / cm 2 .

[0079] The spinning speed is 300m / min. After the spinning is normal, continue to increase the spinning speed to 900m / min and 1100m / min to wind smoothly. Fuzz appears when the spinning speed is increased to 1200m / min, so the spinning speed should be controlled below 1100m / min.

[0080] The above-mentioned winding yarn with a spinning speed of 300m / min is stretched 2.5 times, the fiber breaking strength is 3.09CN / dtex, and the breaking elongation is 140.0%. Stretched 3 times, the fiber breaking strength is 3.72CN / dtex, and the breaking elongation is 115.7%. Stretched 3.5 times, the fiber breaking strength is 4.48CN / dte...

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] Sea component (PA6:LDPE=1:2) pump supply rate 11.5g / min, melt spinning temperature 170-275°C, screw speed 29r / min, screw pressure 60kg / cm 2 .

[0086] The above spinning process stretches 3.5 times, the fiber breaking strength is 3.91CN / dtex, and the breaking elongation is 104.8%. Bundle the above coiled filaments into 40,000 deniers, pass through the oil immersion tank (the concentration of oil agent is 4-5%), 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 sea component (PA6: LDPE = 1: 1) pump supply rate is 8.5g / min, the melt spinning temperature is 170-275°C, the screw speed is 29r / min, the obtained fiber is drawn 3.3 times, and the single filament fineness is 6dtex. The breaking strength is 4.50CN / dtex, the breaking elongation is 110.0%, the fiber PA6 content is 80%, the fiber strength is high, and the elongation is large. The product is extracted with toluene, and the sea components are dissolved. The single-filament fineness of the satellite island is 0.03dtex, and the single-filament fineness of the main island is 0.22dtex.

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Abstract

The invention relates to a chemical fiber, in particular to a satellite type superfine denier polyamide short fiber as well as a production method thereof. According to the technical proposal of the invention, 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 sea component is a mixture of low density polyethylene and polyamide, the polyamide therein forms a plurality of satellite islands around the island, and the titer of the satellite islands is smaller than that of the island; andthe island component and the sea component are in a ratio of 1:0.4 to 2.3, the polyamide and low density polyethylene in the sea component are in a ratio of 1:0.667 to 4, the filament titer ranges from 0.05 to 0.3dtex after the island is separated, and the unit is weight ratio. The chemical fiber can increase the content of effective constituents; and the viscosity of the sea component can make the island difficult to be adhered, and the spinnability in the spinning process is improved, so the sea component and the island component will not be separated easily.

Description

technical field [0001] The invention relates to a chemical fiber, in particular to a superfine denier polyamide composite short fiber and a preparation method. 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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