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Supercritical extraction and drying method in preparation of ultrahigh molecular weight polyethylene fibre

A polyethylene fiber, ultra-high molecular weight technology, applied in the direction of single-component polyolefin rayon, wet spinning, etc., can solve the problems of increasing cost and time, and achieve the effect of reducing equipment investment and simplifying the process flow

Inactive Publication Date: 2005-11-09
BEIJING TEX STRONG NEW MATERIAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In addition, in the existing supercritical extraction, extraction and drying are carried out in different equipment, which increases the cost and time of preparation

Method used

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  • Supercritical extraction and drying method in preparation of ultrahigh molecular weight polyethylene fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Extraction and separation by isothermal method. The temperature of the extraction tank is 120°C and the pressure is 6MPa. 30 kg of condensed fibers fall into the extraction kettle and arrange them neatly and seal them. Use a high-pressure pump to press 40 liters of extractant propane from the bottom into the extraction kettle, and use isothermal extraction and separation. The extractant is propane. After the extraction of propane is completed, it flows out from the top, and enters the separation tank after being decompressed by the pressure reducing valve. The gaseous propane is pumped out from the top, and then pressed into the extraction kettle through a high-pressure pump for recycling. Liquid solvent is pumped from the bottom and recycled. The extraction time is 0.2D minutes (D is the fineness of single filament, the unit is dtex).

[0035] After the extraction is finished, feed hot nitrogen into the extraction kettle for drying, the nitrogen flow rate is 50 lite...

Embodiment 2

[0039] Extraction and separation by isobaric method. The extractant is propane. The temperature of the extraction tank is 100°C and the pressure is 5MPa. Condensation-molded fibers fall into the extraction kettle to arrange them neatly and seal them. The fiber quality that puts in is 30 kilograms. Use a high-pressure pump to press 40 liters of propane, the extraction agent, into the extraction kettle from the bottom. After the propane extraction is completed, it flows out from the top and enters the separation kettle after heat exchange. The pressure remains constant and the temperature drops to 20°C. Bottom pumps away and recycles. The gas is pumped out from the top, and then pressed into the extraction kettle through a high-pressure pump for recycling. The extraction time is 0.2D minutes (D is the fineness of single filament, the unit is dtex).

[0040] After the extraction is finished, feed hot nitrogen into the extraction kettle for drying, the nitrogen flow rate is 5...

Embodiment 3

[0044] Extraction and separation by adsorption. The extractant is propylene. The temperature of the extraction tank is 100°C and the pressure is 10MPa. 35 kg of condensed fibers fall into the extraction kettle and are neatly arranged and sealed. Use a high-pressure pump to press 30 liters of extractant propylene into the extraction kettle from the bottom. After the propylene extraction is completed, it flows out from the top with the pressure and temperature kept constant, and enters the separation kettle. Molecular sieve adsorbent is filled in the separation kettle. Propylene is separated from the first solvent by adsorption separation. The extraction time is 0.1D minutes (D is the fineness of single filament, the unit is dtex).

[0045] After the extraction is finished, use a vacuum pump to extract the gas in the extraction kettle, and stop when the gauge pressure drops to 100kPa.

[0046] After supercritical extraction, the content of solvent in the fiber is less than ...

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Abstract

The invention relates to a supercritical extracting and drying method in a process of preparing ultrahigh molecular weight polyethylene filber (UHMWPE), including: the fiber molded after cooled and solidified drops in an extraction kettle, and is arranged regularly; feeding extractant into the extraction kettle for supercritical extraction; after extraction complete, feeding hot gas in to dry; or drying in a vacuumizing mode; wherein the mentioned extractant is selected from one of methane, ethane, ethane, and propylene. The invention adopts supercritical extraction method to remove the first solution added in a solution preparing process, and the extracting and drying arts are completed in one device, simplifying the process.

Description

technical field [0001] The invention belongs to the field of polymer material preparation and chemical separation, and in particular relates to a supercritical extraction and drying process for removing the first solvent in the production process of ultra-high molecular weight polyethylene fibers, which are completed in the same equipment. Background technique [0002] Ultra-high molecular weight polyethylene fiber has high strength, high modulus, and high degree of orientation, and is widely used in the manufacture of protective equipment, ropes, fishing nets, and sports equipment. [0003] Ultra-high molecular weight polyethylene fiber, also known as high-strength and high-modulus polyethylene fiber, high-degree orientation polyethylene fiber, high-performance polyethylene fiber. In 1979, Smith and Lemstra of DSM Company in the Netherlands invented the process of producing ultra-high molecular weight polyethylene fibers by gel spinning, and obtained British patents GB20516...

Claims

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Application Information

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IPC IPC(8): D01D5/06
Inventor 尹晔东
Owner BEIJING TEX STRONG NEW MATERIAL DEV
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