Preparation method of high monofilament cohesive force polyurethane elastic fiber

A technology of polyurethane elasticity and cohesion, which is applied in the field of improving the cohesion between polyurethane elastic fiber monofilaments and multi-fila coarse denier yarns, and can solve problems such as unclearness, poor cohesion, and splitting, and achieve simple process principles and improved Effect of unwinding and cohesion improvement

Inactive Publication Date: 2013-06-26
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The force required to separate the monofilaments in the fiber is called the cohesive force. If the cohesive force is not good, it is easy to cause the phenomenon of filament separation after friction with the machine in the weaving process, re

Method used

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  • Preparation method of high monofilament cohesive force polyurethane elastic fiber

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Experimental program
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Effect test

Embodiment 1

[0015] Solvent is not included in the polyurethane stock solution, the mass percentage range of magnesium stearate is 0.1%; 0.1-0.5%. In the spinning and oiling process, the content of magnesium stearate in the silicone oil is 0.5%, and the oiling rate is 4.0%. The other processes are conventional dry spinning processes to produce 30D polyurethane elastic fibers.

Embodiment 2

[0017] Solvent is not included in the polyurethane stock solution, the mass percentage range of magnesium stearate is 0.1%; 0.1-0.5%. In the spinning and oiling process, the content of magnesium stearate in the silicone oil is 1.0%, and the oiling rate is 3.0%. The other processes are conventional dry spinning processes to produce 30D polyurethane elastic fibers.

Embodiment 3

[0019] Solvent is not included in the polyurethane stock solution, the mass percentage range of magnesium stearate is 0.05%, the mass percentage range of antioxidant is 0.1-1.5%, the mass percentage range of dyeing agent is 0.1-0.5%, and the mass percentage range of anti-yellowing agent 0.1-0.5%. In the spinning and oiling process, the content of magnesium stearate in the silicone oil is 1.0%, and the oiling rate is 5.0%. The other processes are conventional dry spinning processes to produce 30D polyurethane elastic fibers.

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Abstract

The invention relates to a preparation method of high monofilament cohesive force polyurethane elastic fiber. The preparation method comprises the following steps of: (1) polymerization: reacting polytetramethylene ether glycol (PTMEG) with 4, 4-benzhydryl diisocyanate at 60-90 DEG C to generate prepolymer; mixing a solvent dimethylacetamide, the prepolymer and diamine in a chain extension reactor to have chain extension reaction to generate polyurethane stock solution; adding antioxidant, coloring agent, anti-yellowing agent and magnesium stearate into the polyurethane stock solution; mixing, storing and curing to obtain polyurethane spinning solution, wherein the polyurethane does not contain a solvent, and the mass percent range of magnesium stearate is 0.01-0.1%; and (2) spinning: transferring the polyurethane spinning solution into a spinneret plate through a gear pump to be extruded; curing the stock solution flowing out from the spinneret plate by high-temperature air in a spinning channel to obtain the polyurethane elastic fiber; and finally, twisting, oiling and winding to obtain the polyurethane elastic fiber finished product. The polyurethane elastic fiber has good cohesive force.

Description

technical field [0001] The invention relates to a method for improving the cohesion force between monofilaments of polyurethane elastic fibers, which is mainly used for preparing multi-fila coarse denier yarns of more than 20D, and belongs to the technical field of polyurethane elastic fibers. Background technique [0002] Polyurethane elastic fiber is currently a widely used chemical fiber. Applications range from socks, stockings, underwear to sportswear, high-end swimwear and more. The force required to separate the monofilaments in the fiber is called the cohesive force. If the cohesive force is not good, it is easy to cause the phenomenon of filament separation after friction with the machine in the weaving process, resulting in broken filaments, resulting in waste of cloth and weaving. Cloth process is not normal. Even if there is no broken yarn after the yarn is divided during weaving, there may be defects such as staining and dull color during dyeing. For this pro...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01F11/08D01D1/02D01D5/04C08G18/66C08G18/48C08G18/10
Inventor 刘亚辉席青周建军陈厚翔
Owner ZHEJIANG HUAFENG SPANDEX
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