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Preparation method of polyetherimide foamed particles

A technology of polyetherimide and foamed particles, which is applied in the field of polyetherimide foamed particles, can solve the problem of unstable performance of polyetherimide foamed particle moldings, uneven cells, and stretching effects. To achieve the effect of convenient preparation, controllable shape and stable performance

Inactive Publication Date: 2021-01-05
广东正浩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a preparation method of polyetherimide foamed particles, which is used to solve the problems of insufficient uniformity of cells of polyetherimide foamed particles, poor stretching effect and polyetherimide foaming. The performance of the foam particle molding is unstable, and the polyetherimide foam molding is prone to a large amount of powder falling off during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation work: polyetherimide raw materials, reaction kettle, high-pressure mixing agent and mold;

[0025] Step 1. Prepare the polyetherimide raw materials first;

[0026] Step 2. Put the prepared polyetherimide raw material into an extruder for heat melting, and the temperature of heat melting is 110°C;

[0027] Step 3. Extrude the hot-melted polyetherimide raw material from the extruder into a mold for thermoplastic, and the thermoplastic temperature is 130°C;

[0028] Step 4, compressing and curing the imide raw material in a mold to obtain a polyetherimide foamed molded body;

[0029] Step 5. Pour the polyetherimide foamed body into a reactor for high-pressure reaction, and the pressure in the reactor is 10 MPa;

[0030] Step 6: Injecting high-pressure mixed fluid into the reactor to obtain expanded polyetherimide particles.

[0031] Preferably, the high-pressure mixed fluid in step 1 includes supercritical fluid carbon dioxide and an organic solvent group. ...

Embodiment 2

[0038] Preparation work: polyetherimide raw materials, reaction kettle, high-pressure mixing agent and mold;

[0039] Step 1. Prepare the polyetherimide raw materials first;

[0040] Step 2. Put the prepared polyetherimide raw material into an extruder for heat melting, and the temperature of heat melting is 120°C;

[0041] Step 3. Extrude the hot-melted polyetherimide raw material from the extruder into the mold for thermoplastic, and the thermoplastic temperature is 140°C;

[0042] Step 4, compressing and curing the imide raw material in a mold to obtain a polyetherimide foamed molded body;

[0043] Step 5. Pour the polyetherimide foam molding body into a reactor for high-pressure reaction, and the pressure in the reactor is 12 MPa;

[0044] Step 6: Injecting high-pressure mixed fluid into the reactor to obtain expanded polyetherimide particles.

[0045] Preferably, the high-pressure mixed fluid in step 1 includes supercritical fluid carbon dioxide and an organic solvent ...

Embodiment 3

[0052] Preparation work: polyetherimide raw materials, reaction kettle, high-pressure mixing agent and mold;

[0053] Step 1. Prepare the polyetherimide raw materials first;

[0054] Step 2. Put the prepared polyetherimide raw material into an extruder for heat melting, and the temperature of heat melting is 130°C;

[0055]Step 3, extruding the hot-melted polyetherimide raw material from the extruder into a mold for thermoplastic, and the thermoplastic temperature is 150°C;

[0056] Step 4, compressing and curing the imide raw material in a mold to obtain a polyetherimide foamed molded body;

[0057] Step 5. Pour the polyetherimide foam molding body into a reactor for high-pressure reaction, and the pressure in the reactor is 14 MPa;

[0058] Step 6: Injecting high-pressure mixed fluid into the reactor to obtain expanded polyetherimide particles.

[0059] Preferably, the high-pressure mixed fluid in step 1 includes supercritical fluid carbon dioxide and an organic solvent g...

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PUM

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Abstract

The invention discloses a preparation method of polyetherimide foamed particles, which comprises the following steps: 1, preparing a polyetherimide raw material, 2, putting the prepared polyetherimideraw material into an extruder to perform hot melting, 3, extruding the hot-melted polyetherimide raw material from the extruder into a mold to perform thermoplastic treatment, thereby obtaining the polyetherimide foamed particles and 4, compressing and curing the imide raw material in a mold to obtain the polyetherimide foam molded body. The method comprises the following steps: carrying out hotmelting on a polyetherimide raw material, extruding the polyetherimide raw material subjected to hot melting into a mold from an extruder for thermoplastic treatment, compressing and curing the polyetherimide raw material in the mold to obtain a polyetherimide foam molded body, carrying out compression, and heating and curing to obtain the polyetherimide foam molded body. On one hand, the performance of the polyetherimide foam forming body is stable due to the light polyetherimide foam particles with good mechanical properties, and on the other hand, the size and shape of the polyetherimide foam forming body are controllable.

Description

technical field [0001] The invention relates to the technical field of polyetherimide expanded particles, in particular to a preparation method of polyetherimide expanded particles. Background technique [0002] Polyetherimide (PEI for short) is a super engineering plastic made of amorphous polyetherimide, which has the best high temperature resistance and dimensional stability, as well as chemical resistance, flame retardancy, electrical properties, and high strength. , high rigidity, etc., PEI resin can be widely used in high temperature resistant terminals, IC base, lighting equipment, FPCB (flexible circuit board), liquid delivery equipment, aircraft internal parts, medical equipment and household appliances, etc., polyetherimide foam It has excellent high and low temperature resistance, self-flame retardant, low smoke and non-toxic, radiation resistance, etc., so it is widely used in high-tech fields such as aviation, aerospace, ships, and rail transit. The main prepar...

Claims

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Application Information

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IPC IPC(8): C08J9/12B29C44/34B29C44/20C08L79/08
CPCC08J9/122B29C44/3415B29C44/20C08J2379/08C08J2201/03
Inventor 颜俊
Owner 广东正浩新材料科技有限公司