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Sheath-core type low-melting-point copolyamide composite fiber and preparation method thereof

A technology of copolyamide and composite fiber, which is applied in the direction of conjugated synthetic polymer artificial filament, fiber treatment, filament/thread forming, etc., which can solve the problem of hard spots, melting and shrinkage on the cloth surface, affecting the style and feel of the fabric, etc. problem, to achieve the effect of improving tensile strength and tear resistance, good molding, and avoiding shrinkage problems

Inactive Publication Date: 2015-09-09
CTA HIGH TECH FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patent introduces the single-component low-melting point copolyamide fiber and its preparation method, but the single-component fiber is prone to shrinkage during the post-weaving process, and hard spots are prone to appear on the cloth surface, which affects the style and feel of the fabric

Method used

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  • Sheath-core type low-melting-point copolyamide composite fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Place copolyamide slices with a melting point of 105°C to 120°C in a vacuum drum for drying. The drying temperature is 60°C, the vacuum degree is -0.2MPa, dried for 14 hours, and the moisture content of the slices reaches 189ppm.

[0037] (2) Feed the dried copolyamide chips and polypropylene chips into the screw extruder respectively for heating and plasticization. The screw extrusion plasticization temperature of the copolyamide chips is 168°C, 172°C, 175°C, 175°C, 175°C , The plasticizing temperature of polypropylene chip screw extrusion is 220°C, 221°C, 222°C, 222°C, 222°C.

[0038] (3) Copolyamide slices and polypropylene slices are respectively melted and plasticized by the screw, and then measured by two metering pumps according to the weight ratio of 80:20, and the melts are extruded into the same composite component to form a skin-core section and then sprayed Holes are ejected to obtain primary silk.

[0039] (4) The as-spun silk is cooled, oiled, drawn a...

Embodiment 2

[0042] Only the weight ratio of copolyamide chips and polypropylene chips was changed to 70:30, and the same spinning process as in Example 1 was adopted to obtain sheath-core low-melting point copolyamide composite fibers.

[0043] The obtained composite fiber has a linear density of 149.8D, a breaking strength of 3.25cN / dtex, and a breaking elongation of 53%. The composite fiber is applied to the post-weaving process, and the fabric can be melted and bonded at a heat treatment temperature of 120°C, and its tear resistance is good, which can meet the use requirements.

Embodiment 3

[0045] (1) Place copolyamide slices with a melting point of 90°C to 102°C in a vacuum drum for drying at a drying temperature of 56°C and a vacuum of -0.13MPa for 13 hours, and the moisture content of the slices reaches 180ppm.

[0046](2) Feed the dried copolyamide chips and high-density polyethylene chips into the screw extruder respectively for heating and plasticization. 134°C, the plasticizing temperature of high-density polyethylene chip screw extrusion is 168°C, 170°C, 170°C, 170°C, 170°C.

[0047] (3) Copolyamide slices and high-density polyethylene slices are respectively melted and plasticized by the screw, and then measured by two metering pumps according to the weight ratio of 85:15. The silk holes are sprayed out to obtain primary silk.

[0048] (4) The as-spun silk is cooled, oiled, drawn and shaped, and wound into a tube to obtain a composite fiber. The drawing temperature is 53°C, the setting temperature is 67°C, the draw ratio is 2.0, and the winding speed is...

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Abstract

The invention relates to a sheath-core type low-melting-point copolyamide composite fiber and a preparation method thereof. The sheath of the composite fiber is copolyamide, the core is polyolefin, the melting point of the sheath ranges from 90 DEG C to 130 DEG C, the melting point of the core ranges from 130 DEG C to 190 DEG C, the breaking strength is in a range of 1.8-3.4 cN / dtex, and the elongation at break is in a range of 50%-90%. The preparation method of the composite fiber comprises steps as follows: copolyamide slices and polyolefin slices are dried and molten respectively and then ejected by a same composite assembly to form filaments, and the composite fiber is prepared through cooling, oiling, draft setting and winding into rolls. The sheath can be molten at the lower temperature through heat setting or ironing and plays a role in bonding and fixing the fiber, and the core is the polyolefin and can keep certain strength and flexibility at the temperature; compared with single-component low-melting-point fibers, the fiber has the advantages that the core is the polyolefin, the production cost can be reduced, and the economic benefit can be increased. The composite fiber can be applied to shoe upper fabric, felt, curtain fabric, garment cuffs and collars, the paper industry, automobile interiors and the like.

Description

technical field [0001] The invention relates to the field of copolyamide composite fibers, in particular to a sheath-core type low melting point copolyamide composite fiber and a preparation method thereof. Background technique [0002] The fabric bonding process is a commonly used technique in fabric processing. As early as 1952, the British K. Tanner evenly coated polyethylene on the fabric by dusting to make a fusible interlining. However, polyethylene feels hard and is only used for shirt collar lining. After 1965, West Germany and Switzerland successfully developed low-melting point copolyamide hot-melt fusible interlining, which significantly improved the quality of the fabric and made the hot-melt fusible interlining develop rapidly. [0003] Low melting point copolyamide is obtained by copolymerizing three or more polyamide monomers (such as polyamide 6, polyamide 66, polyamide 1010, polyamide 1212, etc.) in a certain proportion and by selecting an appropriate proce...

Claims

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Application Information

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IPC IPC(8): D01F8/12D01F8/06D01D13/00D01D5/34
Inventor 许志强高扬袁聪慧李顺希黄芽尚小冬詹莹韬李睿焦红娟占海华
Owner CTA HIGH TECH FIBER
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