Ultra-fine denier polyurethane filament

Abstract

The invention relates to a superfine denier polyurethane filament and the method to manufacture. The filament is an island type superfine denier polyurethane filament that the low density polyethylene as see const and the polyurethane as the island const. And the weight ratio of polyethylene is from 0.4 to 1.5:1. The filament number after the island separated is from 0.08 to 0.3dtex. And the density of finished silk fiber product is 150-200dtex; breakdown strength of fiber is 1.9-2.1CN / dtex; the elongation at break is 100-150%. The invention is easy to be industrialization manufactured.

Description

technical field

[0001] The invention relates to a chemical fiber, in particular to manufacturing a superfine denier polyurethane composite filament and a preparation method thereof. Background technique:

[0002] Island-in-the-sea composite fiber is a new technology for manufacturing ultra-fine fibers. It consists of two polymers that are melted separately through a twin-screw composite spinning machine and enter the island-in-sea spinneret. The two melts of the sea and the island pass through their respective channels. The entrances of the spinneret holes meet and are extruded together. In the island-in-the-sea filament, each fiber contains many island microfibers. After the filament is made into a woven or knitted fabric, the sea component is dissolved, and the island component becomes a superfine fiber to form the substrate of the fabric. The use of sea-island method to produce polyester, brocade and other ultra-fine filaments has been produced for a long time, but in th...

Examples

Embodiment 1

[0061] TPU / LDPE(MI=50) spinning process

[0062] TPU pump supply 13.5g / min, melt spinning temperature 180-245°C, screw speed 12rep / min, screw pressure 70kg / cm 3 .

[0063] LDPE pump supply is 9.6g / min, melt spinning temperature is 150-245°C, screw speed is 21-22rep / min, screw pressure is 52-62kg / cm 2 .

[0064] The spinning speed is 300m / min. After the spinning is normal, continue to increase the spinning speed to 800m / min to wind smoothly. When the spinning speed is increased to 900m / min, fluff appears, so the spinning speed should be controlled below 800m / min.

[0065] The above-mentioned winding yarn with a spinning speed of 300m / min, stretched 3 times, the fiber breaking strength is 1.75CN / dtex, and the elongation at break is 115.3%, stretched 5 times, the fiber breaking strength is 1.94CN / dtex, and the breaking elongation is 1.94CN / dtex. The rate is 88.5%.

Embodiment 2

[0067] TPU / LDPE(MI=50) spinning process

[0068] The TPU pump supply is 13.5g / min, the melt spinning temperature is 180-235°C, the screw speed is 12rep / min, and the screw pressure is 97kg / cm 3 .

[0069] LDPE pump supply is 11.5g / min, melt spinning temperature is 160-235°C, screw speed is 29rep / min, screw pressure is 60kg / cm 2 .

[0070] The above process stretches 3.7 times, the fiber breaking strength is 1.2CN / dtex, and the breaking elongation is 134.8%.

Embodiment 3

[0072] TPU / LDPE (MI=38) spinning process

[0073] The TPU pump supply is 13g / min, the melt spinning temperature is 190-245°C, the screw speed is 12-13rep / min, and the screw pressure is 67kg / cm 3 .

[0074] The LDPE pump supply rate is 8.5g / min, the melt spinning temperature is 190-275°C, the screw speed is 29rep / min, the obtained fiber is stretched 3.3 times, the filament fiber density is 154dtex, the fiber breaking strength is 2.09CN / dtex, and the breaking elongation The elongation rate is 126.6%, the TPU content of the fiber is 60%, the fiber breaking strength is high, and the breaking elongation is relatively large. After the filament was extracted with toluene, the fineness of the filament was 0.3 dtex.

technical field

[0001] The invention relates to a chemical fiber, in particular to manufacturing a superfine denier polyurethane composite filament and a preparation method thereof. Background technique:

[0002] Island-in-the-sea composite fiber is a new technology for manufacturing ultra-fine fibers. It consists of two polymers that are melted separately through a twin-screw composite spinning machine and enter the island-in-sea spinneret. The two melts of the sea and the island pass through their respective channels. The entrances of the spinneret holes meet and are extruded together. In the island-in-the-sea filament, each fiber contains many island microfibers. After the filament is made into a woven or knitted fabric, the sea component is dissolved, and the island component becomes a superfine fiber to form the substrate of the fabric. The use of sea-island method to produce polyester, brocade and other ultra-fine filaments has been produced for a long time, but in th...

Examples

Embodiment 1

[0061] TPU / LDPE(MI=50) spinning process

[0062] TPU pump supply 13.5g / min, melt spinning temperature 180-245°C, screw speed 12rep / min, screw pressure 70kg / cm 3 .

[0063] LDPE pump supply is 9.6g / min, melt spinning temperature is 150-245°C, screw speed is 21-22rep / min, screw pressure is 52-62kg / cm 2 .

[0064] The spinning speed is 300m / min. After the spinning is normal, continue to increase the spinning speed to 800m / min to wind smoothly. When the spinning speed is increased to 900m / min, fluff appears, so the spinning speed should be controlled below 800m / min.

[0065] The above-mentioned winding yarn with a spinning speed of 300m / min, stretched 3 times, the fiber breaking strength is 1.75CN / dtex, and the elongation at break is 115.3%, stretched 5 times, the fiber breaking strength is 1.94CN / dtex, and the breaking elongation is 1.94CN / dtex. The rate is 88.5%.

Embodiment 2

[0067] TPU / LDPE(MI=50) spinning process

[0068] The TPU pump supply is 13.5g / min, the melt spinning temperature is 180-235°C, the screw speed is 12rep / min, and the screw pressure is 97kg / cm 3 .

[0069] LDPE pump supply is 11.5g / min, melt spinning temperature is 160-235°C, screw speed is 29rep / min, screw pressure is 60kg / cm 2 .

[0070] The above process stretches 3.7 times, the fiber breaking strength is 1.2CN / dtex, and the breaking elongation is 134.8%.

Embodiment 3

[0072] TPU / LDPE (MI=38) spinning process

[0073] The TPU pump supply is 13g / min, the melt spinning temperature is 190-245°C, the screw speed is 12-13rep / min, and the screw pressure is 67kg / cm 3 .

[0074] The LDPE pump supply rate is 8.5g / min, the melt spinning temperature is 190-275°C, the screw speed is 29rep / min, the obtained fiber is stretched 3.3 times, the filament fiber density is 154dtex, the fiber breaking strength is 2.09CN / dtex, and the breaking elongation The elongation rate is 126.6%, the TPU content of the fiber is 60%, the fiber breaking strength is high, and the breaking elongation is relatively large. After the filament was extracted with toluene, the fineness of the filament was 0.3 dtex.

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