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...

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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