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A microcellular foamed fiber, and a process of preparing for the same

A microporous and fiber technology, applied in the field of microporous fiber and its manufacturing, can solve the problems of difficult-to-process microporous fiber and lower draw ratio

Inactive Publication Date: 2007-03-14
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this case new problems arise such as reduction of draw ratio during drawing, which makes it difficult to process microporous fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Polyamide 6 resin with a relative viscosity of 3.4 was melted and mixed with a static mixer in an extruder at a temperature of 250° C., while 3% by weight of carbon dioxide (relative to the weight of the resin) was introduced into the extruder to prepare a liquid polymer A single-phase solution with a uniform concentration of gas and gas. The single-phase solution of liquid polymer and gas is continuously extruded through the spinneret of the spinning pack (there are five spinnerets), the diameter of the spinneret is 0.25mm, the length is 2.5mm, and the extrusion rate is 10g / min , and subject the single-phase solution to a rapid pressure drop rate to produce a fibrous microporous discharge. Water at 25° C. is continuously sprayed onto the fibrous microporous extrudate from 1 cm below the bottom surface of the spinning assembly to cool the extrudate rapidly. The extrudate was then wound at a winding speed of 500 m / min, enabling a spin draw of 12, to produce microporous ...

Embodiment 2～10 and comparative example 1

[0067] In addition to changing the cooling medium type, rapid cooling method, spinning drawing, winding speed, polymer type for fiber formation, spinning temperature, gas type and gas introduction amount according to Table 1, the same method as in Example 1 was used. and fabricate microporous fibers under the same conditions. The evaluation results of various physical properties of the manufactured microporous fibers are listed in Table 2.

[0068]

[0069] ※The polyethylene terephthalate (1.1) of Example 2 * Refers to polyethylene terephthalate with an intrinsic viscosity of 1.1

[0070]

[0071] ※Comparative Example 1 was not wound into a roll, so it was impossible to evaluate its cell density, volume expansion rate, ratio of cell length to cell diameter, light texture, and touch performance.

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PUM

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Abstract

The present invention discloses microcellular fibers, in which microcells are formed with a density of more than 10<7>cells / cm<3> with a supercritical fluid introduced into fiber forming polymers and have a rate of volume expansion of 1.2 to 50, a ratio of microcell length to microcell diameter of more than 2 and a monofilament diameter of more than 5 m. The microcellular fibers provide high and uniform cell densities and are good in the rate of volume expansion and the ratio of cell length to cell diameter, thus they are very excellent in lightweight feeling and touch. The microcellular fibers are made by a method for making microcellular fibers, wherein a supercritical fluid is introduced into an extruder upon melting and mixing fiber forming polymers in the extruder, to thus prepare a single-phase solution of molten polymer and gas, then the single-phase solution of molten polymer and gas is extruded (spun) through spinneret of spinning pack by subjecting the single-phase solution to a rapid pressure drop, to thus make microcellular extrusion materials, the microcellular extrusion materials are rapidly cooled by a cooling medium, and then they are wound at a winding speed of 10 to 6,000m / min so that a spinning draft can be 2 to 300.

Description

technical field [0001] The present invention relates to a microporous fiber having micropores in the fiber and a method for producing the microporous fiber having very good lightness and touch properties. [0002] More particularly, the present invention relates to microporous fibers and methods for their manufacture, which are formed by introducing a supercritical fluid into an extruder to form a molten polymer when continuously extruding and spinning a fiber-forming polymer and gas, and then feed the single-phase solution to the spinneret of the spin pack for spinning, and then allow it to cool rapidly; it provides dense and uniform micropores with good volume Expansion rate and ratio of pore length to pore diameter. Background technique [0003] Conventional cellular polymer products have generally been used in the industry for a considerable time to make lightweight polymer products and save on the amount of polymer required. Typical of these are polystyrene foam produ...

Claims

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Application Information

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IPC IPC(8): D01F1/00
CPCD01D5/088D01F1/08D01F6/60D01F6/62
Inventor 崔荣百李庸桓韩仁埴
Owner KOLON IND INC
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