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Method for preparing supercritical fluid reinforced fluorine-containing polymer product

A supercritical fluid and polymer technology, applied in the field of polymer materials, can solve the problem of less fluorine-containing polymers, achieve the effects of lower processing temperature, no solvent pollution, and avoid decomposition

Active Publication Date: 2012-06-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are relatively few researches on supercritical carbon dioxide technology assisted extrusion processing of fluoropolymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step (1). Turn on the heating system of the twin-screw extruder, preheat Zone 1 and Zone 2 of the twin-screw extruder for 1 hour, and the preheating temperature reaches 200°C;

[0023] Step (2). Turn on the feeding device and feed polyvinylidene fluoride (PVDF) into zone 1 of the twin-screw extruder at a rate of 4 kg / hour;

[0024] Step (3). The temperature is 60 DEG C, the supercritical carbon dioxide that pressure is 12MPa is injected into the cylinder body of twin-screw extruder by 3 districts of twin-screw extruder with the speed of 3.4 milliliters / min;

[0025] Step (4). The screw melt pump speed of the twin-screw extruder is adjusted to be 3 rpm, and carbon dioxide and fluoropolymers are melt-blended in zones 4 to 7. After blending, the screw melt pump is sent into 9 zone, the processing temperature in zones 3 to 9 of the twin-screw extruder is 175°C;

[0026] Step (5). Release carbon dioxide through the pressure relief device at the head of the twin-screw extrud...

Embodiment 2

[0029] Step (1). Turn on the heating system of the twin-screw extruder, preheat Zone 1 and Zone 2 of the twin-screw extruder for 2.5 hours, and the preheating temperature reaches 310°C;

[0030] Step (2). Turn on the feeding device and feed polyperfluoroethylene propylene (FEP) into zone 1 of the twin-screw extruder at a rate of 1 kg / hour;

[0031] Step (3). The supercritical carbon dioxide with a temperature of 31.1° C. and a pressure of 7.4 MPa is injected into the barrel of the twin-screw extruder from the 3rd zone of the twin-screw extruder at a speed of 1 ml / min;

[0032] Step (4). Adjust the rotational speed of the screw melt pump of the twin-screw extruder to be 1 rev / min, and carry out melt blending of carbon dioxide and fluoropolymer in zones 4 to 7, and then send it into 9 by the screw melt pump after blending. zone, the processing temperature in zones 3 to 9 of the twin-screw extruder is 290°C;

[0033] Step (5). Release carbon dioxide through the pressure relief d...

Embodiment 3

[0036] Step (1). Turn on the heating system of the twin-screw extruder, preheat Zone 1 and Zone 2 of the twin-screw extruder for 2 hours, and the preheating temperature reaches 285°C;

[0037] Step (2). Turn on the feeding device, and feed ethylene-tetrafluoroethylene copolymer (ETFE) into zone 1 of the twin-screw extruder at a speed of 10 kg / hour;

[0038] Step (3). The temperature is 55 DEG C, the supercritical carbon dioxide of 15MPa is injected into the barrel of the twin-screw extruder by 3 districts of the twin-screw extruder at a speed of 10 ml / min;

[0039]Step (4). The screw melt pump speed of the twin-screw extruder is adjusted to 2.3 rpm, and carbon dioxide and fluoropolymer are melt-blended in zones 4 to 7. After blending, the screw melt pump is sent into 9 zone, the processing temperature in zones 3 to 9 of the twin-screw extruder is 280°C;

[0040] Step (5). Release carbon dioxide through the pressure relief device at the head of the twin-screw extruder, so that...

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Abstract

The invention relates to a method for preparing a supercritical fluid reinforced fluorine-containing polymer product, which comprises: preheating a region 1 and a region 2 in a double screw extruder, feeding the fluorine-containing polymer into the region 1, and injecting supercritical carbon dioxide at 31.1 to 70 DEG C and under 7.4 to 25MPa into a cylinder from a region 3; regulating the rotating speed of a screw melt pump to 1 to 10r / min, melting and blending the carbon dioxide and the fluorine-containing polymer in regions 4, 5, 6, and 7, releasing carbon dioxide, and reducing pressure ina cylinder in a region 9 to normal temperature; and extruding from a die head to form the fluorine-containing polymer product. According to the method disclosed by the invention, the pressure in the double screw cylinder is controlled by regulating the rotating speed of the melt pump to allow the carbon dioxide fluid to uniformly and stably plasticize and melt the polymer; and thus, the processing temperature is reduced to 5 to 20 DEG C, the fluorine-containing polymer is protected from decomposition, and processing window is enlarged. The method disclosed by the invention is environment-friendly, avoids solvent pollution and can ensure continuous production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a processing method for supercritical fluid reinforced fluorine-containing polymers. Background technique [0002] Fluorine-containing functional materials are the most excellent materials among polymer materials. Compared with traditional plastics, they have excellent electrical properties, low dielectric constant, good heat resistance, chemical corrosion resistance, durability, and weather resistance. , Low flammability, low moisture absorption, low friction. This enables fluorine-containing functional materials to be used in many industrial production fields, such as aerospace industry, electrical and electronic industry, medical pharmaceuticals, machinery industry, chemical industry and environmental protection. The main application forms of fluoroplastics include various functional films, insulation protection layers for wires and cables, gaskets, seal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L27/16C08L23/08C08L27/18C08L27/14B29C47/92B29C48/92
CPCB29C48/40B29C48/92B29C2948/92561B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 薛立新刘富朱琦良王益
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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