Melt-spinning method for polyformaldehyde fibers

A polyoxymethylene fiber and melt spinning technology, which is applied in the melting of filament raw materials, drawing spinning, fiber processing, etc., can solve the problems such as not being popularized and applied, the industrialized production of polyoxymethylene fibers, and resin bubbles being solved.

Inactive Publication Date: 2011-04-13
SICHUAN TEXTILE SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above reports on the POM fiber spinning method are very early, due to the high crystallinity of POM, the difficulty in controlling the crystallization speed, and the fact that the molecular chains are easily entangled at high temperatures and the decomposition of the resin causes bubbles, etc., it is difficult to use the usual The spinning process produces high-strength polyoxymethylene fibers. Many reports can only be limited to laboratory tests, and have not been further popularized and applied. Industrialized production of polyoxymethylene fibers has never been realized.

Method used

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  • Melt-spinning method for polyformaldehyde fibers
  • Melt-spinning method for polyformaldehyde fibers
  • Melt-spinning method for polyformaldehyde fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The molecular weight M of the polyoxymethylene resin ranges from 20000 to 40000, and the melt index is 10 to 12g / 10min. The temperature of the polyoxymethylene resin is raised from 100°C to 110°C within 5 minutes, and vacuum dry distillation is carried out for 2 hours. The pre-crystallization time was 4 hours, and the pre-crystallization temperature was 90°C. Produced by melt spinning at a draw speed of 800 m / min. 100°C ethylene glycol aqueous solution is slowly cooled, and 2°C water bath is strongly cooled. During the post-stretching finishing process, the stretching ratio in the pre-stretching area is controlled at 1.01, and the stretching ratio in the hot-stretching area is 3.0. The stretching temperature and thermal crystallization The setting temperature differs by 50°C, and the drawing environment is propane.

Embodiment 2

[0019] The molecular weight M range of the polyoxymethylene resin is 40000-50000, and the melt index is 7-9g / 10min. The temperature of the polyoxymethylene resin is raised to 110°C within 3 minutes at 110°C, and the hot air is continuously dried for 4h. The pre-crystallization time was 5 hours, and the pre-crystallization temperature was 100°C. Produced by melt spinning at a draw speed of 1500 m / min. Slow cooling of acetamide aqueous solution at 100°C, strong cooling in a water bath at 2°C, during the post-stretching finishing process, the stretching ratio in the pre-stretching area is controlled at 1.02, and the stretching ratio in the hot-stretching area is 4.0. Stretching temperature and thermal crystallization The temperature difference is 30°C, the hot water bath is pressurized and stretched, the time is controlled within 1s, and the pressure is 100 atmospheres.

Embodiment 3

[0021] The molecular weight M range of the polyoxymethylene resin is 60000-80000, and the melt index is 7-9g / 10min. The temperature of the polyoxymethylene resin is raised to 110°C within 2 minutes at 110°C, and vacuum dry distillation is carried out for 5 hours. The pre-crystallization time was 4 hours, and the pre-crystallization temperature was 110°C. Produced by melt spinning at a draw speed of 1800 m / min. Slow cooling with water vapor at 110°C and strong cooling in a water bath at 3°C. During the post-stretching finishing process, the stretching ratio in the pre-stretching area is controlled at 1.03, and the stretching ratio in the hot-stretching area is 4.5. The stretching temperature and thermal crystallization setting temperature With a difference of 20°C, fluoroethane is stretched under pressure, the time is controlled within 0.5s, and the pressure is 150 atmospheres.

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Abstract

The invention discloses a method for producing polyformaldehyde fibers with strong breaking strength. In the method, a melt-spinning process is adopted. Before spinning, polyformaldehyde resin is arranged in a vacuum oven, or is dried by continuous hot air or N2, and is heated from 100 DEG C to 110 DEG C within five minutes and kept at the temperature for 1 to 8 hours. Nascent fibers are slowly cooled and then quenched in hot solution or superheated vapor, so holes produced in the multi-ratio drafting process of the fibers are reduced. In the back-draft heat setting of the fibers, the difference of drafting temperature and heat crystallization setting temperature is controlled to be 20 to 45 DEG C, and multi-ratio multi-stage slow drafting is adopted, wherein hot solution water-bath pressurization drafting is adopted in primary drafting setting, and is performed for a time controlled to be 0.2 to 2 seconds.

Description

technical field [0001] The invention relates to a method for melt spinning polyoxymethylene fibers, more particularly to a method for melt spinning polyoxymethylene fibers with a high degree of crystal orientation. Background technique [0002] Polyoxymethylene is a crystalline polymer material synthesized from methanol, insoluble in water, acetone, alkaline solution, and extremely difficult to dissolve in dilute acid solution. It has good comprehensive performance and colorability, and its strength, rigidity, impact strength and creep resistance are excellent. Its fatigue resistance is the best among all thermoplastics, and it has high creep and stress relaxation capabilities. Long-term Use dimensionally stable. Therefore, high-strength and high-modulus fibers made of POM are expected to meet broader application requirements. [0003] The crystallinity of POM is as high as 70%, the crystallization speed is fast, and the process is difficult to control, resulting in diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/088D01D5/14D01D1/04D01F6/78
Inventor 王桦蒲宗耀曾宪森覃俊易长海何勇冯军
Owner SICHUAN TEXTILE SCI RES INST
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