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Method for Solidifying and Forming Precursor in Ultra-high Molecular Weight Polyethylene Dry Spinning Process

An ultra-high molecular weight, polyethylene spinning technology, applied in the direction of single-component polyolefin artificial filament, wet spinning, textiles and papermaking, etc., can solve the problems of high moisture content in raw silk, lengthy and complicated process, etc., to achieve Effects of increasing crystal orientation, enhancing fiber strength, and improving tensile strength

Active Publication Date: 2017-09-15
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be known from the above known technologies that during the dry spinning process of ultra-high molecular weight polyethylene, the processes of solvent volatilization and precursor solidification are lengthy and complicated, and the moisture content of the obtained precursor is also relatively high.

Method used

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  • Method for Solidifying and Forming Precursor in Ultra-high Molecular Weight Polyethylene Dry Spinning Process
  • Method for Solidifying and Forming Precursor in Ultra-high Molecular Weight Polyethylene Dry Spinning Process

Examples

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Effect test

Embodiment

[0032] A method for solidifying and forming precursors in ultra-high molecular weight polyethylene dry spinning process, such as figure 1 As shown, the ultra-high molecular weight polyethylene spinning solution is extruded from the spinneret and enters the tunnel in the form of tow 6 for solidification and molding. The tunnel includes a uniform heating zone 4 and a circulating blowing zone 5 arranged in sequence up and down, and the tow 6 passes through in sequence. After the uniform heating zone 4 and the circulating blowing zone 5, a precursor with a certain degree of crystal orientation is formed.

[0033] refer to figure 2 , the structure of the uniform heating zone 4 is a hollow cylindrical shell, the shell is divided into inner and outer layers, the inner layer is the heating layer 7, and the outer layer is the insulation layer 8; the uniform heating zone 4 can be set in one or more sections, and the heating method of the heating layer 7 Including heat conduction oil h...

Embodiment 2

[0040]Using the process of Example 1 and the tunnel described in Example 1 to solidify and form the precursor during the ultra-high molecular weight polyethylene dry spinning process, decahydronaphthalene is a solvent, and the mass percent concentration is 8% ultra-high molecular weight polyethylene spinning solution After being extruded by the spinneret, it enters the tunnel device, the length of the tunnel is 8m, the temperature in the tunnel is 100°C, the residence time of the filaments in the tunnel is 30sec, the inert gas is nitrogen, the temperature is 20°C, and the flow rate is 50Nm 3 , a pair of symmetrical baffles, the angle between the baffle and the tunnel is 90°, the solvent residue in the obtained precursor is 0.7% by weight, and the strength of the precursor is 4.2cN / dtex.

Embodiment 3

[0042] Using the process of Example 1 and the tunnel described in Example 1 to solidify and form the precursor during the ultra-high molecular weight polyethylene dry spinning process, decahydronaphthalene is a solvent, and the mass percent concentration is 8% ultra-high molecular weight polyethylene spinning solution After being extruded by the spinneret, it enters the tunnel device, the length of the tunnel is 6m, the temperature in the tunnel is 100°C, the residence time of the filaments in the tunnel is 25sec, the inert gas is nitrogen, the temperature is 25°C, and the flow rate is 40Nm 3 , a pair of asymmetrical baffles, the angle between the baffles and the tunnel is 90°, the solvent residue in the obtained precursor is 0.9% by weight, and the strength of the precursor is 4.0cN / dtex.

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Abstract

The invention relates to a method for precursor fiber curing molding during ultrahigh-molecular-weight polyethylene dry spinning. The method is characterized in that ultrahigh-molecular-weight polyethylene spinning solution is extruded through a spinning nozzle and then enters a processional road for curing molding in a tow form, the processional road comprises an evenly heating area and a circulating blowing area which are arranged with one above the other, and the tow passes through the evenly heating area and the circulating blowing area in sequence to form precursor fiber with certain crystallization orientation degree. Compared with the prior art, the method has the advantages that organic solvents in the precursor fiber can be effectively removed, the crystallization orientation degree of the precursor fiber can be increased, and fiber strength can be improved. The tow passes through the processional road to form the precursor fiber with certain crystallization orientation degree, and the precursor fiber has certain strength, can be subjected to ultra-hot-drawing and is especially suitable for the field of ultrahigh-molecular-weight polyethylene fiber dry spinning.

Description

technical field [0001] The invention relates to a method for preparing fiber precursors, in particular to a method for solidifying and forming precursors in the dry spinning process of ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene fiber, also known as high-strength and high-modulus polyethylene fiber, refers to polyethylene with a relative molecular weight of more than 1 million, which is made of ultra-high molecular weight polyethylene fiber after spinning and ultra-stretching. One of the performance fibers. Ultra-high molecular weight polyethylene fiber has the advantages of high specific strength, high specific modulus, low density, large work of fracture, low dielectric constant, wear resistance and corrosion resistance, etc., and is widely used in bulletproof vests, bulletproof helmets, military facilities and equipment Bulletproof armor, aerospace and other military fields, and the development of high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01F6/46D01D10/00D01D10/02D01D13/02
Inventor 王新威孙勇飞巩明方张玉梅杨潇王萍侯秀红
Owner SHANGHAI RES INST OF CHEM IND
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