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A method for directly preparing ultra-high molecular weight polyethylene fibers

A technology of ultra-high molecular weight and polyethylene fiber, which is applied in the direction of melt spinning, drawing spinning, and complete sets of equipment for the production of artificial threads, etc. It can solve the problems of fiber strength gaps and other problems, and achieve low cost, short process flow, and single machine The effect of high yield

Inactive Publication Date: 2019-03-22
ZIBO AMERICAN STANDARD POLYMER FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the fiber strength obtained by the solution gel spinning method, there is still a gap in the strength of the fiber obtained by the above method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the embodiment of the present invention, a method for directly preparing ultra-high molecular weight polyethylene fibers comprises the following steps:

[0022] (1) Add polyethylene with a number average molecular weight of 2.3 million as a raw material into a twin-screw extruder with a length-to-diameter ratio of 1:40 for melt spinning to prepare primary fibers; the temperature of each section of the screw is 150-250°C, and the screw The extrusion speed is 200r / min, the spinneret has 120 holes, the diameter is 0.4mm, the temperature of the spinneret melt is 160°C, and the ejection speed is 2m / s;

[0023] (2) Cool the virgin fiber extruded in step (1) through a cooling water tank; the temperature of the cooling water is 40°C;

[0024] (3) Pass the fiber cooled in step (2) through a hot water bath for two high-stretch stretches; the temperature of the water bath is controlled at 80°C, and the stretch ratio is 25 times;

[0025] (4) After the high-stretched fiber in s...

Embodiment 2

[0028] In the embodiment of the present invention, a method for directly preparing ultra-high molecular weight polyethylene fibers comprises the following steps:

[0029] (1) Add polyethylene with a number average molecular weight of 3.5 million as a raw material into a twin-screw extruder with an aspect ratio of 1:40 for melt spinning to prepare primary fibers; the temperature of each section of the screw is 150-250°C, and the screw The extrusion speed is 250r / min, the spinneret has 150 holes, the diameter is 0.9mm, the temperature of the spinneret melt is 320°C, and the ejection speed is 5m / s;

[0030] (2) Cool the virgin fiber extruded in step (1) through a cooling water tank; the temperature of the cooling water is 20°C;

[0031] (3) Pass the fiber cooled in step (2) through a hot water bath for two high-stretch stretches; the temperature of the water bath is controlled at 85°C, and the stretch ratio is 40 times;

[0032] (4) After the high-stretched fiber in step (3) is ...

Embodiment 3

[0035] In the embodiment of the present invention, a method for directly preparing ultra-high molecular weight polyethylene fibers comprises the following steps:

[0036] (1) Add polyethylene with a number average molecular weight of 2.5 million as a raw material into a twin-screw extruder with a length-to-diameter ratio of 1:40 for melt spinning to prepare primary fibers; the temperature of each section of the screw is 150-250°C, and the The extrusion speed is 250r / min, the spinneret has 150 holes, the diameter is 0.6mm, the temperature of the spinneret melt is 220°C, and the ejection speed is 4m / s;

[0037] (2) Cool the virgin fiber extruded in step (1) through a cooling water tank; the temperature of the cooling water is 30°C;

[0038] (3) Pass the fiber cooled in step (2) through a hot water bath for two high-stretch stretches; the temperature of the water bath is controlled at 95°C, and the stretch ratio is 40 times;

[0039] (4) After the high-stretched fiber in step (3...

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Abstract

The invention discloses a method for directly preparing ultra-high molecular weight polyethylene fibers, which comprises the steps of taking polyethylene with the number-average molecular weight being 2.3-3.5 million as a raw material, putting the polyethylene into a double-screw extruder to melt, and extruding nascent fibers; (2) cooling the nascent fibers extruded in the step (1) by a cooling water tank; (3) carrying out two times of high stretching on the fibers cooled in the step (2) through a hot water bath; and (4) carrying out two times of hot-air low stretching on the fibers highly stretched in the step (3) so as to acquire finished fibers. According to the invention, the ultra-high molecular weight polyethylene is taken as the raw material directly, no auxiliaries are added, and the prepared polyethylene fibers are 12-30cN / dtex in fiber strength and 6-9% in elongation at break. The method disclosed by the invention is shot in technological process, simple to operate, low in energy consumption, low in cost and high in single-machine yield. The method can be widely applied to weaving of various ropes, knitting of fishing nets and weaving of industrial cloth and industrial belts, and can also be applied to national defense equipment.

Description

technical field [0001] The invention relates to the technical field of polymer material processing, in particular to a method for directly preparing ultra-high molecular weight polyethylene fibers. Background technique [0002] UHMWPE fibers have no side groups, good symmetry and regularity, low internal rotation barriers in single bonds, good flexibility, and easy to form a three-dimensional ordered structure with regular arrangements. After high-stretching, the molecular chains are stretched along the direction has a higher degree of orientation and crystallinity. Compared with carbon fiber and aramid fiber, ultra-high molecular weight polyethylene fiber has the following advantages: higher strength; lighter weight, with a density of only 0.97g / cm 3 ; Better chemical stability, strong chemical inertness, strong acid, strong alkali solution and organic solvent have no effect on its strength; good weather resistance, after 1500h of sunlight, the fiber strength retention rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D13/00D01D5/08D01D5/14
Inventor 贾陆林常广
Owner ZIBO AMERICAN STANDARD POLYMER FIBER CO LTD