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Production method of high-intensity and high-modulus polyethylene fibers

A technology of polyethylene fiber and production method, which is applied in the directions of single-component polyolefin rayon filament, melt spinning method, spinning solution preparation, etc. , the effect of increasing strength and modulus, and increasing productivity

Active Publication Date: 2013-06-12
ZHEJIANG KANG LONG DA SPECIAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a twin-screw extruder with a screw diameter of 135MM is used, the residence time of the spinning solution in the twin-screw extruder is 40.5 minutes. If the residence time is less than 40.5 minutes, polyethylene cannot be uniformly dissolved. If the screw diameter of the twin-screw extruder is greater than 135MM, its length-to-diameter ratio can only be 46 and not more than 52. Therefore, limited by the equipment, the existing twin-screw extruder cannot achieve the purpose of one-step dissolution and uniform mixing
Therefore, it limits the increase in production
In addition, for ultra-high molecular weight polyethylene with a molecular weight of more than 3 million, if the residence time in the twin-screw extruder is too long and the shear force is large, it is very easy to cause degradation of ultra-high molecular weight polyethylene, thereby affecting to the properties of the final fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The ultra-high molecular weight polyethylene powder with a relative average molecular mass of 4.5 million and 70# white oil were respectively injected into the kneader according to the nominal weight concentration of 12% for swelling and dissolving. First, nitrogen was filled, the temperature was controlled at 24 °C, and the shear rate was 180 seconds -1 , to disperse ultra-high molecular weight polyethylene powder for 4 minutes, then raise the temperature to 120°C and the shear rate to 350 seconds -1 , for swelling, the time is 12 minutes, and finally the temperature rises to 250°C, and the shear rate rises to 900 seconds -1 , dissolving for 4 minutes to obtain a transparent and uniform spinning solution; then quantitatively feeding the spinning solution into a single-screw extruder while stirring and extruding, wherein the diameter of the single-screw extruder is 95mm, and the spinning solution The inlet temperature of the single-screw extruder is controlled at 120°C-...

Embodiment 2

[0035] The ultra-high molecular weight polyethylene powder with a relative average molecular weight of 4.22 million and 70# white oil were respectively injected into the kneader according to the nominal weight concentration of 10% for swelling and dissolving. First, nitrogen was filled, the temperature was controlled at 22 °C, and the shear rate was 150 seconds -1 , to disperse ultra-high molecular weight polyethylene powder for 4 minutes, then raise the temperature to 100°C and the shear rate to 380 seconds -1 , to swell for 12 minutes, and finally the temperature rose to 240°C and the shear rate rose to 800 seconds -1 , dissolving for 4 minutes to obtain a transparent and uniform spinning solution; then quantitatively feeding the spinning solution into a single-screw extruder while stirring and extruding, wherein the diameter of the single-screw extruder is 75mm, and the spinning solution The inlet temperature of the single-screw extruder is controlled at 120°C-200°C, the m...

Embodiment 3

[0037] The ultra-high molecular weight polyethylene powder with a relative average molecular weight of 4.4 million and 70# white oil were respectively injected into the kneader at a nominal weight concentration of 8% for swelling and dissolving. First, nitrogen gas was filled, the temperature was controlled at 20°C, and the shear rate was 150°C. second -1 , to disperse ultra-high molecular weight polyethylene powder for 4 minutes, then raise the temperature to 100°C and the shear rate to 300 seconds -1 , to swell for 12 minutes, and finally the temperature rises to 230°C and the shear rate rises to 800 seconds -1 , dissolving for 4 minutes to obtain a transparent and uniform spinning solution; then quantitatively feeding the spinning solution into a single-screw extruder while stirring and extruding, wherein the diameter of the single-screw extruder is 85 mm, and the spinning solution The inlet temperature of the single-screw extruder is controlled at 120°C-200°C, the middle ...

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Abstract

The invention discloses a production method of high-intensity and high-modulus polyethylene fibers. The method comprises a swelling and dissolving step, a filtering step, a spinning step, a refrigerating and solidifying step, a pre-stretching step, an extracting step, a drying step, an ultra-stretching step and a winding step, wherein the swelling and dissolving step is performed in a kneading machine; and transparent and uniform spinning solution obtained in the swelling and dissolving step is quantitatively fed into a single screw extruder with stirring for extruding. The production method has the advantages of simple preparation method and high yield of over 300 tons / year and is easy to operate.

Description

technical field [0001] The invention relates to a production method of polyethylene fibers, in particular to a high-capacity production method for rapidly dissolving ultra-high molecular weight polyethylene (UHMWPE) to realize high-strength and high-modulus polyethylene fibers. Background technique [0002] High-strength and high-modulus polyethylene fiber is made from ultra-high molecular weight polyethylene (UHMWPE) through gel spinning and super-drawing. The polyethylene macromolecules that were originally intertwined and arranged in disorder are properly unwound by dissolution, and then Super-stretching achieves a very high degree of orientation and crystallinity, so that the fiber has excellent properties such as light weight, softness, high modulus, UV resistance, impact resistance, acid and alkali resistance, and seawater corrosion resistance. [0003] In 1979, the Dutch DSM company applied for a patent (NL7900990, NL7904990 and corresponding US4344908, special public...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/06D01D1/02D01D5/08D01F6/04
Inventor 张间芳杨福康
Owner ZHEJIANG KANG LONG DA SPECIAL PROTECTION TECH CO LTD
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