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Method for preparing crystalline polyether-ether-ketone foam material

A polyetheretherketone and foam material technology is applied in the field of preparation of high-performance crystalline polyetheretherketone foam materials, and can solve the problems of restricting cell growth, difficult to control the morphology of polyetheretherketone foam, and reducing solubility.

Inactive Publication Date: 2013-02-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of a large number of crystals will lead to CO 2 Reduced gas solubility in the PEEK matrix, affecting nucleation density
A large number of crystals will also limit the growth of cells, and the irregular crystal distribution makes it very difficult to control the shape of polyether ether ketone foam, and it is difficult to obtain good products

Method used

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  • Method for preparing crystalline polyether-ether-ketone foam material
  • Method for preparing crystalline polyether-ether-ketone foam material
  • Method for preparing crystalline polyether-ether-ketone foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, the dried polyether ether ketone particles (MFI=23g / 10min, crystallinity 31.3%) were placed in a high-temperature autoclave, and the cavity was sealed. Use a vacuum pump to remove the air and moisture in the kettle, and then use 500-700psi low-pressure CO 2 The gas is repeatedly flushed 3 to 4 times to ensure that there is no other gas remaining in the kettle. Then inject CO with a high-pressure metering pump 2 Gas, control the constant pressure to 5MPa, increase the temperature of the kettle to 340°C, and the saturation time is 1h; then quickly reduce the pressure to normal pressure through the pressure reducing valve, the depressurization rate is 20MPa / s, and quickly place the reactor in cold water Cool in medium to fix the cell structure, so as to obtain foam samples.

[0026] The samples were taken out for scanning electron microscope analysis of their section, such as figure 1 As shown, the foamed polyether ether ketone sample has a closed-cell structure ...

Embodiment 2

[0028] First, the dried polyether ether ketone particles (MFI=23g / 10min, crystallinity 31.3%) were placed in a high-temperature autoclave, and the cavity was sealed. Use a vacuum pump to remove the air and moisture in the kettle, and then use a 500-700psi low-pressure CO 2 The gas is repeatedly flushed 3 to 4 times to ensure that no other gas remains in the kettle. Then inject CO with a high-pressure metering pump 2 Gas, the control constant pressure is 10MPa. Raise the temperature of the kettle to 335°C, and the saturation time is 0.5h; then quickly reduce the pressure to normal pressure through the pressure reducing valve at a rate of 20MPa / s, and quickly place the reaction kettle in cold water to cool to fix the cell structure , to obtain foam samples.

[0029] The samples were taken out for scanning electron microscope analysis of their section, such as figure 2 As shown, the foamed polyether ether ketone sample has a closed-cell structure with a pore size of 30-80 μm a...

Embodiment 3

[0031] First, the dried polyether ether ketone particles (MFI=23g / 10min, crystallinity 31.3%) were placed in a high-temperature autoclave, and the cavity was sealed. Use a vacuum pump to remove the air and moisture in the kettle, and then use a 500-700psi low-pressure CO 2 The gas is repeatedly flushed 3 to 4 times to ensure that no other gas remains in the kettle. Then inject CO with a high-pressure metering pump 2 Gas, the control constant pressure is 15MPa. Raise the temperature of the kettle to 337.5°C, and the saturation time is 1h; then quickly reduce the pressure to normal pressure through the pressure reducing valve at a rate of 20MPa / s, and quickly place the reactor in cold water to cool the cell structure. Obtain a foam sample.

[0032] The samples were taken out for scanning electron microscope analysis of their section, such as image 3 As shown, the foamed polyetheretherketone sample has a closed-cell structure with a pore size of 10-70 μm and a pore density o...

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Abstract

The invention belongs to the technical field of processing of high molecular material, and in particular relates to a method for preparing a crystalline polyether-ether-ketone foam material. By the method, the content of crystal in polyether-ether-ketone and the thickness and the perfection of a laminated crystal are controlled by controlling saturation temperature, saturation pressure and saturation time by using near-critical or supercritical carbon dioxide as a physical foaming agent so as to prepare the polyether-ether-ketone foam material with high performance. By the method, the defects that the gas saturation time is long, the solubility is small, the growth of a foam hole and morphology crystallized area are limited and the like are overcome, so that by controlling technological parameters, the high-performance foam material with the low-intensity and the high foaming ratio is effectively prepared, the application field of polyether-ether-ketone is widened, and the blank of a domestic high-performance crystalline polyether-ether-ketone foaming technology is made up.

Description

technical field [0001] The invention belongs to the technical field of polymer material processing, and in particular relates to a preparation method of a high-performance crystalline polyether ether ketone foam material. Background technique [0002] High-performance special engineering plastics are the key development areas clearly planned in the national medium and long-term scientific and technological development plan outline, and polyetheretherketone (PEEK) is one of the most important categories. As a crystalline polymer material, polyether ether ketone has a glass transition temperature (Tg) of 143°C and a melting point (Tm) in the range of 330-350°C. It can be used stably for a long time below 250°C and has a high heat resistance level. , radiation resistance, chemical resistance, impact resistance, creep resistance, good flame retardancy, excellent electrical properties, etc., in high-speed rail transit systems, low energy consumption and new energy vehicles, effic...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L61/16
Inventor 姜振华王辉张淑玲郭万才王贵宾
Owner JILIN UNIV
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