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Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight

An ultra-high molecular weight, polyethylene fiber technology, applied in the direction of single-component polyolefin rayon, fiber processing, rayon cleaning/drying, etc., can solve the problems of easy volatility, equipment corrosion, volatilization loss, etc. Simple, low oil content, high modulus effect

Active Publication Date: 2007-08-08
安徽威亚新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low boiling point and volatile characteristics of dichloromethane make it easy to remove by drying, but it is also easy to cause volatile loss
Hydrolysis of dichloromethane will produce hydrogen chloride, causing corrosion to equipment
However, the patent does not involve the extraction temperature
And there is no specific numerical requirement for the water seal

Method used

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  • Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight
  • Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight
  • Extraction and desiccation method in preparing process of polyvinyl fibre with super high molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The polyethylene powder with a relative molecular weight of 5 million, additives, and solvent paraffin oil are thoroughly mixed and uniformly dissolved before entering the screw extruder. Then it enters the spinning box, passes through the spinneret, and is extruded into filaments. After cooling in a coagulation water tank, gel fibers are formed and extracted with dichloromethane. The extraction equipment is an extraction tank made of stainless steel. The extraction adopts three-stage countercurrent extraction, and the extraction temperature is 20°C. Water is added to the extraction equipment to form a water seal with a thickness of 5 cm.

[0045] Then enter the drying box for drying treatment, the drying temperature is 35 ℃. The dry gas is air. The dried fibers are hot drawn and then wound into finished products.

[0046] The dry waste gas is condensed, separated and purified by adsorption for recycling.

[0047] Finally, high-strength and high-modulus ultra-high...

Embodiment 2

[0049] The polyethylene powder with a relative molecular weight of 5 million, additives, and solvent paraffin oil are thoroughly mixed and uniformly dissolved, and then extruded into filaments by a screw extruder through a spinneret. After cooling in a coagulation water tank, gel fibers are formed and extracted with dichloromethane. The extraction equipment is a ceramic extraction box, which adopts one-stage countercurrent extraction, and the extraction temperature is 5°C. Then enter the drying oven for drying treatment at a drying temperature of 10°C. The dry gas is air. The dried fibers are hot drawn and then wound into finished products.

[0050] Add water to the extraction tank to form a water seal with a thickness of 1 cm.

[0051] The dry exhaust gas is separated and purified by adsorption, and some fresh air is supplemented and then enters the drying box for recycling.

[0052] Finally, high-strength and high-modulus ultra-high molecular weight polyethylene fibers a...

Embodiment 3

[0054] The polyethylene powder with a relative molecular weight of 5 million, additives, and solvent paraffin oil are thoroughly mixed and uniformly dissolved, and then extruded into filaments by a screw extruder through a spinneret. After cooling in a coagulation water tank, gel fibers are formed and extracted with dichloromethane. The extraction equipment is an extraction tank made of polytetrafluoroethylene, which adopts countercurrent secondary extraction, and the extraction temperature is 10°C. Then enter the drying box for drying treatment, the drying temperature is 25 ℃. The drying gas was nitrogen. The dried fibers are hot drawn and then wound into finished products.

[0055] Add water to the extraction tank to form a water seal with a thickness of at least 5 cm.

[0056] After the dry waste gas is purified by membrane separation, some fresh air is supplemented and then enters the drying box for recycling.

[0057] Finally, high-strength and high-modulus ultra-high...

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Abstract

The invention relates to extracting and drying methods in the process for preparing uhmwpe fiber, belonging to the field for polymers preparing technology. The method comprises that the uhmwpe powder, assistant and solvent is solidified by extruding after they are mixed in uniformity and solved sufficiently; the solvent is eliminated in extracting process and the extraction agent is eliminated by drying technology; the final product is formed by heat drawing. It is characterized in that because dichloromethane is used as the extraction agent, there is good safety, low boiling point and it is eliminated easily. Because countercurrent extraction operation is adopted in the extracting process and there is no ultrasonic wave, it is provided with low drying temperature, simple technology, high intensity of fiber product, high modulus and low oil percentage of fiber.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to an extraction and drying process using dichloromethane as an extraction agent in the production process of ultra-high molecular weight polyethylene fibers. Background technique [0002] 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. Ultra-high molecular weight polyethylene fiber has high strength, high modulus, and high degree of orientation, and is widely used in the manufacture of bulletproof protective products, ropes, cables, fishing nets, and sports equipment. Ultra-high molecular weight polyethylene fiber is the commercialized high-performance fiber with the highest specific strength. [0003] In 1979, Smith and Lemstra of DSM Company in the Netherlands invented the process of producing ultra-hig...

Claims

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Application Information

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IPC IPC(8): D01D10/00D01D10/06D01F6/04
Inventor 赵国樑尹晔东
Owner 安徽威亚新材料技术有限公司
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