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Method for solidifying and sizing gel-spun fibers in production process of ultra-high molecular weight polyethylene (UHMWPE) fibers

An ultra-high molecular weight, polyethylene fiber technology, applied in the field of high-performance fibers, can solve the problems of poor product performance consistency, poor production stability, uneven fineness of finished products, etc., to achieve the effect of improved product performance, easy implementation and simple process

Active Publication Date: 2017-07-25
ZHEJIANG QIANXILONG SPECIAL FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned problems of uneven fineness of finished products, poor production stability and poor product performance consistency existing in the existing two-step production process technology, the purpose of the invention is to provide a structure with simple and reasonable production process lines, convenient production and processing, high strength and Coagulation and fixing method of jelly filaments in the production process of ultra-high molecular weight polyethylene fibers with high modulus, small denier dispersion, good product performance consistency, and stable and reliable quality

Method used

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  • Method for solidifying and sizing gel-spun fibers in production process of ultra-high molecular weight polyethylene (UHMWPE) fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The ultra-high molecular weight polyethylene spinning stock solution with a relative molecular weight of 4 million enters the screw extruder, then enters the spinning box 1, and enters the cooling and shaping tank 3 through the spinneret assembly 2. The water seal 20cm of cooling sizing tank 3, the phase separation promotor 5 of cooling sizing tank 3 is methylene chloride, its effective thickness 30cm, 15 degrees of cooling temperature, the effective residence time of jelly silk in methylene chloride is 1 minute, The jelly yarn with an oil content of about 67% is formed, dropped into the barrel, and left to stand for 24 hours. After cold drawing-extraction-drying-multi-stage hot drawing-finished yarn winding, the final fiber strength is above 28CN / dtex , the modulus reaches above 1000 CN / dtex, and the fineness CV value is less than 1.5%.

Embodiment 2

[0031] Example 2: The ultra-high molecular weight polyethylene spinning stock solution with a relative molecular weight of 4 million enters the screw extruder, then enters the spinning box 1, and enters the cooling and shaping tank 3 through the spinneret assembly 2. The water seal 15cm of cooling shaping groove 3, the phase separation promotor 5 of cooling shaping groove 3 is tetrachlorethylene, and its effective thickness 30cm, cooling temperature 15 degree, the effective residence time of jelly silk in tetrachloroethylene is 40 seconds, The jelly yarn with an oil content of about 75% is formed, dropped into the barrel, and left to stand for 24 hours. After cold drawing-extraction-drying-multi-stage hot drawing-finished yarn winding, the final fiber strength is above 32CN / dtex , the modulus reaches above 1100 CN / dtex, and the fineness CV value is less than 1.3%.

Embodiment 3

[0032]Example 3: The ultra-high molecular weight polyethylene spinning stock solution with a relative molecular weight of 4.2 million enters the screw extruder, then enters the spinning box 1, and enters the cooling and shaping tank 3 through the spinneret assembly 2. The water seal 15cm of cooling shaping tank 3, the phase separation promotor 5 of cooling shaping tank 3 is trichlorotrifluoroethane, its effective thickness 35cm, 12 degrees of cooling temperature, the effective effect of jelly silk in trichlorotrifluoroethane The residence time is 35 seconds to form jelly filaments with an oil content of about 70%, fall into the barrel, and after standing for 24 hours, go through cold stretching-extraction-drying-multi-stage hot drawing-finished filament winding, and finally make fibers The strength is above 36CN / dtex, the modulus is above 1300 CN / dtex, and the fineness CV value is 0.6%.

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Abstract

The invention discloses a method for solidifying and sizing gel-spun fibers in a production process of ultra-high molecular weight polyethylene (UHMWPE) fibers. Cooling and sizing fluid in a cooling and sizing groove (3) is prepared from a lower phase separation accelerator (5) and an upper water seal (4), wherein the upper water seal (4) is used for cooling and sizing the gel-spun fibers; the lower phase separation accelerator (5) is used for accelerating phase separation so as to prompt paraffin oil on the surfaces of the gel-spun fibers to be separated out in an accelerating way, and forming porous and reticulated UHMWPE compact layers on the surfaces of the gel-spun fibers so as to increase the strength and initial modulus of the gel-spun fibers, enable the fineness consistency of finished products to be high and reduce strength fluctuation; the paraffin oil is separated out from the gel-spun fibers and is then dissolved in the phase separation accelerator so as to form lower mixed liquid, and the density of the lower mixed liquid is controlled to be greater than 1.1g / cm<3>; the gel-spun fibers are discharged out of the cooling and sizing groove (3), and the oil content of the gel-spun fibers is controlled to be within a range of 50-85%. After the structure is adopted, the method has the advantages of being simple in structure production process line, convenient in production and processing, high in strength and modulus, low in fineness dispersion, good in product performance consistency, and the like.

Description

technical field [0001] The invention relates to the technical field of high-performance fibers, in particular to a process method for wet production of ultra-high molecular weight polyethylene fibers. Background technique [0002] At present, there are two main types of gel spinning methods in the world to manufacture ultra-high molecular weight polyethylene fibers, one is the dry spinning method represented by DSM and Toyobo, and the other is the wet method represented by Honeywell. spinning method. The main difference between the two is the use of different solvents and subsequent processes. The DSM process uses decahydronaphthalene as a solvent, and decahydronaphthalene volatilizes in the spinning tunnel, which saves the subsequent extraction and drying process; Honeywell uses paraffin oil as a solvent, which requires a subsequent extraction process. One solvent is extracted, and then the second solvent is removed by hot air drying. [0003] There are two main producti...

Claims

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Application Information

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IPC IPC(8): D01F11/06
CPCD01F11/06
Inventor 姚湘江陈宏
Owner ZHEJIANG QIANXILONG SPECIAL FIBER
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