Polyamide 5X short fiber as well as preparation method and application thereof

A polyamide and staple fiber technology, applied in the field of polyamide 5X staple fiber and its preparation, can solve the problems such as poor mechanical properties of sewing thread, achieve excellent performance, low elongation, and reduce the effect of greenhouse effect

Active Publication Date: 2017-07-18
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of poor mechanical properties of sewing thread in the prior art, the present invention provides a polyamide 5X short fiber, its preparation method and the sewing thread made therefrom

Method used

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  • Polyamide 5X short fiber as well as preparation method and application thereof
  • Polyamide 5X short fiber as well as preparation method and application thereof
  • Polyamide 5X short fiber as well as preparation method and application thereof

Examples

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preparation example Construction

[0108] A preparation method of polyamide 5X short fiber, it may further comprise the steps:

[0109] (1) Polymerizing 1,5 pentamethylenediamine and dicarboxylic acid to form a polyamide 5X melt; or, heating polyamide 5X (polyamide 5X resin) to a molten state to form a polyamide 5X melt;

[0110] (2), the polyamide 5X melt is spun to form spun silk;

[0111] (3) Polyamide 5X staple fibers are obtained after the as-spun silk is processed.

[0112] Wherein, in the step (1), the polyamide 5X resin is a polyamide 5X resin chip.

[0113] The relative viscosity of polyamide 5X resin chip can be 3.1-3.6.

[0114] Because polyamide 5X resin has strong water absorption, it can be dried before it is heated and melted. The drying temperature is 100-150°C and the drying time is 10-30h. The moisture content of polyamide 5X after drying is 50-1500ppm, preferably 200-800ppm, more preferably 300-700ppm, even more preferably 400-600ppm.

[0115] The spinning in step (2) includes the followi...

Embodiment 1

[0151] The present embodiment provides a kind of preparation method of polyamide 56 short fiber, it comprises the steps:

[0152] (1) Select polyamide 56 slices with a relative viscosity of 3.1, and dry them under nitrogen protection. The drying temperature is 135°C and the drying time is 20 hours. After drying, the polyamide 56 slices enter the single-screw machine through a closed nitrogen protection hopper Carry out heating and melting, obtain polyamide 56 melt;

[0153] (2), polyamide 56 melt is sprayed out by the spinneret that number of holes is 1500f, and the draw ratio of spinneret is 130, and after polyamide 56 melt sprays out spinneret hole, cools by ring air blowing, and wind temperature is 25°C, wind speed 0.5m / s, to get as-spun silk;

[0154] (3), as-spun silk is fed into the silk barrel by feeding rollers to obtain raw silk, and the raw silk is stretched in three stages by cluster frame, and the total draw ratio is 4.5 times, wherein, the first-order draw ratio ...

Embodiment 2

[0157] The present embodiment provides a kind of preparation method of polyamide 56 short fiber, it comprises the steps:

[0158] (1) Select polyamide 56 slices with a relative viscosity of 3.2, and dry them under nitrogen protection. The drying temperature is 135°C, and the drying time is 20 hours. After drying, the polyamide 56 slices enter the single-screw machine through a closed nitrogen protection silo. Carry out heating and melting, obtain polyamide 56 melt;

[0159] (2), polyamide 56 melt is sprayed out by the spinneret that number of holes is 2500f, and the draw ratio of spinneret is 90, and after polyamide 56 melt sprays out spinneret hole, cools by ring air blowing, and wind temperature is 25°C, wind speed 0.6m / s, to get spun silk;

[0160] (3), as-spun silk is fed into the silk barrel by feeding rollers to obtain raw silk, and the raw silk is stretched in three stages by cluster frame, and the total stretching ratio is 3.8 times, wherein, the primary stretching ra...

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Abstract

The invention discloses a polyamide 5X short fiber, a preparation method and application thereof in preparing a sewing thread. The production raw material of the polyamide 5X short fiber at least includes 1,5-pentamethylene diamine and dicarboxylic acid or polyamide 5X acquired by polymerizing the monomers of 1,5-pentamethylene diamine and dicarboxylic acid. The breaking strength of the polyamide 5X short fiber is 6.0-10.0cN / dtex. The preparation method comprises the following steps: (1) polymerizing 1,5-pentamethylene diamine and dicarboxylic acid, thereby forming a polyamide 5X flux, or heating the polyamide 5X resin to molten state, thereby forming the polyamide 5X flux; (2) spinning the polyamide 5X flux, thereby forming a primary raw silk; and (3) treating the primary raw silk, thereby acquiring the polyamide 5X short fiber. The polyamide 5X short fiber has high strength, low elongation and low thermal contractility and especially can meet the requirement for the sewing thread.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a polyamide 5X short fiber and its preparation method and application Background technique [0002] Sewing thread is the thread required for knitted clothing products. According to the raw materials, sewing thread can be divided into three categories: natural fiber sewing thread, synthetic fiber sewing thread and mixed sewing thread. In recent years, with the development of high-speed sewing, in order to ensure the continuous thread in high-speed sewing, the requirements for the strength of sewing thread have also increased. Traditional cotton thread, silk thread and natural fiber sewing thread are becoming more and more difficult to meet the requirements of modern high-speed sewing. Require. [0003] CN1028771182A discloses a polyamide synthetic fiber sewing thread. Although the sewing thread is rich in bulkiness and soft to the touch, on the one hand, the sewing thread...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/60C08G69/26D01D5/08D01D4/02D01D5/088D01D5/12D01D10/02D02G3/44
CPCC08G69/26D01D4/02D01D5/08D01D5/088D01D5/12D01D10/02D02G3/44
Inventor 孙朝续徐晓辰秦兵兵刘修才
Owner CATHAY R&D CENT CO LTD
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