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Preparation method of ultra-high molecular weight polyethylene fiber

An ultra-high molecular weight, polyethylene fiber technology, applied in the direction of single-component polyolefin rayon, fiber processing, spinning solution preparation, etc., can solve the problems of decreased strength, very large influence, unfavorable fibers, etc., and achieve mechanical properties. Lifting, improving mechanical properties, enhancing the effect of stretching

Inactive Publication Date: 2009-11-11
杨珍芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the primary filaments are set in the jelly, the difference in the cooling rate between the core and the outside of the fiber will cause a difference in stretchability. This difference will have a certain impact on the subsequent extraction and stretching, especially when the stretching ratio When it exceeds a certain value, the mechanical properties of the fiber are unstable and the strength will decrease
[0007] In order to change this phenomenon, it was proposed that when the filaments are formed, a certain amount of nozzle stretching is applied to the primary filaments. The structure of the strip is very fragile and is greatly affected by the external environment. Therefore, applying a high nozzle stretch to the primary filament is not conducive to improving the mechanical properties of the fiber.

Method used

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  • Preparation method of ultra-high molecular weight polyethylene fiber
  • Preparation method of ultra-high molecular weight polyethylene fiber
  • Preparation method of ultra-high molecular weight polyethylene fiber

Examples

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preparation example Construction

[0032] The invention provides a method for preparing ultra-high molecular weight polyethylene fibers, comprising the following steps:

[0033] a) Mix ultra-high molecular weight polyethylene powder with a solvent to obtain a suspension after swelling, and then extrude and dissolve through a twin-screw extruder to obtain a spinning solution with a concentration of 4% to 25%. The solvent is liquid at room temperature hydrocarbons;

[0034] b) Spinning and cooling the spinning solution to obtain jelly filaments;

[0035] c) applying 1-10 times pre-stretching to the jelly filaments, leaving the pre-stretched jelly filaments to stand for 12-48 hours, then extracting and drying;

[0036] d) applying 4 times to 130 times of hot drawing to the dried jelly filaments in the temperature range of 70° C. to 160° C. to obtain ultra-high molecular weight polyethylene fibers.

[0037] In order to achieve the purpose of the present invention, the ultra-high molecular weight polyethylene powd...

Embodiment 1

[0072] Put 80kg of ultra-high molecular weight polyethylene powder and 920kg of paraffin oil into the swelling kettle 101 and stir and swell for 40 minutes at a temperature of 105° C. to obtain a suspension.

[0073] The obtained suspension is sent into the storage tank 102 and cooled to 25°C, and then sent into the twin-screw extruder 103 for extrusion and dissolution. Among them, the inlet temperature of the twin-screw extruder is 100°C, the intermediate temperature is 185°C, and the outlet temperature is 225°C, the suspension stays in the twin-screw extruder for 5 minutes, and the rotation speed of the twin-screw extruder It is 180rpm (rotation / minute). The suspension is extruded and dissolved by a twin-screw extruder, and the macromolecules are unwound to make a transparent jelly spinning solution.

[0074] The jelly spinning solution is extruded at a spinning speed of 1m / min through a metering pump 104, a spinneret with 400 holes (the spinneret diameter is 0.8mm, and the...

Embodiment 6

[0081] In this embodiment, 100 kg of ultra-high molecular weight polyethylene powder and 900 kg of paraffin oil were placed in the swelling kettle 101 and stirred and swelled for 45 minutes at a temperature of 108° C. to obtain a suspension.

[0082] The obtained suspension is sent into the storage tank 102 to cool to 25° C. and then sent to the twin-screw extruder 103 for extrusion and dissolution. Wherein, the inlet temperature of the twin-screw extruder is 105°C, the intermediate temperature is 190°C, and the outlet temperature is 220°C, the residence time of the suspension in the twin-screw extruder is 5 minutes, and the rotation speed of the twin-screw extruder is 200rpm. The suspension is extruded and dissolved by a twin-screw extruder, and the macromolecules are unwound to make a transparent jelly spinning solution.

[0083] According to the same spinning process as in Example 1, jelly filaments were prepared.

[0084] The prepared jelly yarn is passed through a tunne...

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Abstract

The invention relates to a preparation method of ultra-high molecular weight polyethylene fiber, which comprises the following steps: firstly, mixing ultra-high molecular weight polyethylene powder with solvent for swelling to obtain suspending liquid, and then extruding and dissolving the suspending liquid through a double screw extruder to obtain 4-25 percent of spinning solution, wherein the solvent is liquid hydrocarbon under room temperature; secondly, spraying and cooling the spinning solution to obtain gel filament; thirdly, applying 1-10 times of pretensioning to the gel filament, settling the pretensioned gel filament for 12-48h, extracting and drying the gel filament; fourthly, applying 4-130 times of heat drawing to the dried gel filament 70-160 DEG C to obtain the ultra-high molecular weight polyethylene fiber. After the gel filament is formed and pretentioned to a certain degree, the primary filament can be more uniform and has higher tension property , and the ultra-high molecular weight polyethylene fiber with excellent property can be prepared.

Description

technical field [0001] The invention relates to a fiber preparation method, in particular to an ultra-high molecular weight polyethylene (UHMWPE) fiber preparation method. Background technique [0002] Ultra-high molecular weight polyethylene fiber is also called high-strength, high-modulus polyethylene (HSHMPE) fiber or extended-chain polyethylene (ECPE) fiber, which refers to a relative molecular mass of (1~7)×10 6 Polyethylene, an ultra-high molecular weight polyethylene fiber made after spinning-super heat stretching. It is the third generation of high-performance fiber after carbon fiber and aramid fiber. [0003] Compared with other fiber-reinforced composite materials, ultra-high molecular weight polyethylene fiber-reinforced composite materials have the advantages of light weight, impact resistance, and high dielectric properties, and play a pivotal role in modern warfare, aerospace, sea defense, weaponry and other fields . At the same time, the fiber also has bro...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01D5/06D01D10/00D01D10/06D02J1/22D01F6/04
Inventor 周成程
Owner 杨珍芬
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