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Preparation method of ultrahigh-molecular-weight polyethylene fine denier fibers

An ultra-high molecular weight, fine denier fiber technology, applied in the direction of single-component polyolefin rayon, stretch spinning, etc., can solve the problems of destroying the structure of jelly fibers, uneven drafting, and easy breakage of finished fibers. Achieve high extraction efficiency, uniform shrinkage, and the effect of not easy to fuzz.

Active Publication Date: 2013-01-30
CHANGSHU SUPERFIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the structure of the jelly fiber will be destroyed if the super-stretching ratio is too high, resulting in uneven drafting, which makes the finished fiber easy to break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] According to the preparation method of the ultra-high molecular weight polyethylene fiber of the present embodiment, comprises the steps:

[0014] (1) Preparation of frozen collagen silk of ultra-high molecular weight polyethylene: ultra-high molecular weight polyethylene (relative average molecular weight 4.5 million), solvent white oil 70# and phenolic antioxidant, according to the mass ratio of 8:100:0.16 Inject into the unwrapping kettle respectively, shear for 25 minutes under nitrogen protection, and the shear rate is 3000 seconds -1 , to obtain an emulsion-like mixed solution, and then input the mixed solution into the high-shear dispersing emulsification pump for the second shearing, a part of the mixed solution from the emulsification pump is fed into the screw extruder, and the rest Recycle back into the unwrapping kettle. In this example, the screw extruder is twin-screw, the diameter of the screw extruder is 95mm, the ratio of length to diameter is ...

Embodiment 2

[0018] According to the preparation method of the ultra-high molecular weight polyethylene fiber of the present embodiment, comprises the steps:

[0019] (1), with embodiment 1;

[0020] (2) Pre-stretch the 100D jelly collagen filaments obtained in step (1) three times in total, among which, the multiples of the three pre-draws are 5.5 times, 3.5 times and 1.1 times in turn, and the total multiples are 21.2 times. In the process, each group of drafting rollers in the pre-drawing process section is placed in a hydrocarbon oil at 35°C. The oil is replenished to a certain extent and circulated externally to fully ensure the stability of its concentration and temperature. And, after the oil agent is used up, subsequent recovery can be carried out. The number of jelly fibers that can be arranged by the drafting roller has increased by 30% compared with the original process, that is, the output has increased by 30%.

[0021] (3) Using hydrocarbon cleaning agent as the extr...

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Abstract

The invention relates to a method for preparing ultrahigh-molecular-weight polyethylene fine denier fibers by a jelly spinning process, which comprises: (1) preparing jelly protofilaments of ultrahigh-molecular-weight polyethylene; and (2) subjecting the jelly protofilaments to pre-stretching, extraction, drying and hot stretching to obtain ultrahigh-molecular-weight polyethylene fine denier fibers, wherein the pre-stretching is performed for many times till the jelly protofilaments are stretched by 15 to 35 times totally, the many times of stretching are all performed in a stretching medium at 30 to 50 DEG C, the stretching medium is air, water or oil, and the jelly protofilaments are hotly stretched by 35 to 50 times totally. And after the step (1) and before the step (2), the method also comprises a step of standing the jelly protofilaments at a constant temperature of 20 to 40 DEG C and a constant humidity of 30 to 60 percent for 48 to 72 hours. When the method is used, low-titre and high-breaking-strength ultrahigh-molecular-weight polyethylene fine denier fiber products can be obtained, and the production cost is low.

Description

technical field [0001] The invention relates to a preparation method of ultra-high molecular weight polyethylene fine denier fiber. Background technique [0002] Ultra-high molecular weight polyethylene fiber (UHMWPE) is a high-performance fiber that was successfully developed in the late 1970s and entered industrialization in the early 1980s. It is mainly produced by gel spinning. In the prior art, the main steps of the jelly spinning method are as follows: the stock solution made of ultra-high molecular weight polyethylene powder and an appropriate solvent is extruded through a screw extruder, the spinneret holes are formed, and solidified in a water bath to obtain polyethylene fibers The frozen collagen filaments, the frozen collagen filaments are extracted, dried, and superheated to obtain finished fibers, wherein, fibers with low denier or small denier are obtained by increasing the stretching ratio of the nozzle. The disadvantage of this method is that the structure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/12D01F6/46
Inventor 许海霞刘兆峰李振国丁洪昌朱正新蔡建南
Owner CHANGSHU SUPERFIBER
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