Island-fixed sea-island short fiber and its preparation method

A short fiber and island technology, applied in the field of fiber spinning, can solve the problems of poor PET dyeability, hard fabrics, harsh dyeing conditions, etc., and achieve the effect of loose molecular structure, soft texture and good dyeing performance

Inactive Publication Date: 2011-11-30
XIAMEN HONGXIN SPECIAL FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But PET rigidity is stronger, so the fabric fabric that is made by opening fiber of this sea-island staple fiber is harder, and because PET dyeability is relatively poor, cause the fabric that is made by this sea-island staple fiber through fiber opening to carry out dyeing. The dyeing conditions are relatively harsh, and dyeing can only be achieved under high pressure and high temperature conditions.

Method used

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  • Island-fixed sea-island short fiber and its preparation method
  • Island-fixed sea-island short fiber and its preparation method
  • Island-fixed sea-island short fiber and its preparation method

Examples

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preparation example Construction

[0024] The embodiment of the invention discloses a preparation method of fixed island type sea-island fiber, including:

[0025] Melt the island component in the first screw extruder;

[0026] Melt the sea component in the second screw extruder;

[0027] Extruding the melt of the first screw extruder and the melt of the second screw extruder through a spinning assembly to obtain nascent sea-island fibers;

[0028] The nascent sea-island fibers are successively cooled, oiled, drawn, crimped, relaxed and shaped, and then cut to obtain fixed-island sea-island short fibers.

[0029] According to the present invention, the island component is PBT, and the PBT macromolecular segment has a longer flexible segment. Therefore, the fiber prepared from PBT has higher flexibility and elastic recovery rate, and has good dyeing properties. The sea component is an alkali-soluble polyester, preferably a copolyester of polyethylene terephthalate and a dicarboxylic acid (CoPET), and the dicarboxylic aci...

Embodiment 1

[0041] 1. Preparation of fixed island type island short fiber

[0042] After drying 78 parts of PBT chips at 145°C, they were put into the first screw extruder to melt at 260°C; 22 parts of CoPET chips were dried at 125°C and put into the second screw extruder to melt at 275°C.

[0043] The melt of the two screw extruders figure 1 The spinneret shown is extruded to obtain primary sea-island fibers. The following embodiments are all used for extrusion molding with this spinneret at an extrusion pressure of 11Mpa to obtain primary sea-island fibers with an island number of 37. The primary sea-island fibers are formed from islands. The facies and the marine facies surrounding the island facies are composed of PBT and COPET in the marine facies;

[0044] Then, the nascent sea-island fiber is cooled and shaped by side blowing through a cooling and blowing device at a cooling temperature of 23°C, and then oiled by a double-sided tanker. The oiling agent is 4wt% silicone emulsion, and the o...

Embodiment 2 to Embodiment 4

[0049] 1. Preparation of fixed island type island short fiber

[0050] The above three examples all use PBT as the island phase and COPET as the sea phase. The specific process parameters are shown in Table 2, and the properties of the island-shaped sea-island short fibers prepared in Examples 2 to 5 are measured and listed in Table 1.

[0051] 2. Preparation of PBT ultrafine fiber non-woven fabric

[0052] This step of the above three embodiments is the same as that of the first embodiment.

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Abstract

The invention provides an island-fixed type sea-island short fiber, the island component of the island-fixed type sea-island short fiber is polybutylene terephthalate, and the sea component is alkali-soluble polyester. The present invention also provides a method for preparing the sea-island short fiber, comprising: melting the island component in a first screw extruder; melting the sea component in a second screw extruder; The molten body of the first screw extruder and the molten body of the second screw extruder are extruded through the spinning assembly to obtain nascent sea-island fibers; the nascent sea-island fibers are sequentially cooled, oiled, drawn, After crimping, loosening and setting, cut to obtain island-fixed short fibers. The PBT superfine fiber fabric prepared by adopting the island-fixing type sea-island short fiber provided by the invention has soft texture and good elasticity, and can be dyed under normal pressure conditions.

Description

Technical field [0001] The invention relates to the field of fiber spinning, in particular to a fixed island type sea-island short fiber and a preparation method thereof. Background technique [0002] Composite fiber refers to a chemical fiber made of two polymers, two or more polymers or the same polymer with different properties through a composite spinning method. The cross section of the fiber contains two or more non-mixed components. Minute. According to the structure, the common composite fibers are side-by-side, skin-core, sea-island, and split. [0003] The island-in-the-sea composite fiber is melted and mixed with two polymers. The two polymers form an island phase and a sea phase. From the cross section of the fiber, the island phase is surrounded by the sea in a fine and dispersed state. The fiber is spinning After high-stretching and shearing deformation, the island phase becomes a filament shape. By dissolving the sea phase of the sea-island fiber, a bundle of supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/28D01F8/14
Inventor 张飞跃蔡世镇闫忠山
Owner XIAMEN HONGXIN SPECIAL FIBER CO LTD
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