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Preparation method for polyetherimide foam particles

A technology of polyetherimide and foamed particles, which is applied in the field of thermoplastic materials, can solve problems such as high cost, complicated preparation process, and unstable performance of foamed materials, and achieve high cell density, excellent tensile properties, and texture soft effect

Inactive Publication Date: 2018-10-16
SHENZHEN YATAIXING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a kind of preparation method of polyetherimide foamed particle, aim at solving the complicated preparation process of existing polyetherimide foamed material, high cost and the obtained Technical problems of unstable performance of foamed materials

Method used

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preparation example Construction

[0016] On the one hand, the embodiment of the present invention provides a kind of preparation method of polyetherimide expanded particle, and this preparation method comprises the following steps:

[0017] S01: obtaining polyetherimide raw materials;

[0018] S02: extruding the above polyetherimide raw materials into thermoplastic polyetherimide particles by melt extrusion;

[0019] S03: Inject the above-mentioned thermoplastic polyetherimide particles into a high-pressure mixed fluid composed of supercritical fluid carbon dioxide and an organic solvent to obtain expanded polyetherimide particles.

[0020] According to the microfoaming theory of polymers, in order to achieve high expansion and foaming of polyetherimide resin, a high blowing agent concentration must be provided. However, carbon dioxide shows low solubility in thermoplastic polyetherimide matrix. In addition, polyetherimide resin has high matrix modulus and high glass transition temperature. These factors give...

Embodiment 1

[0028] A preparation method of polyetherimide expanded particles, the preparation method comprising the steps of:

[0029] S11: obtaining polyetherimide raw materials.

[0030] S12: Put the polyetherimide raw material into an extruder, and extrude the polyetherimide raw material into thermoplastic polyetherimide particles by melt extrusion;

[0031] S13: Put the above-mentioned thermoplastic polyetherimide particles into an autoclave at a pressure of 12 MPa, inject a high-pressure mixed fluid composed of supercritical fluid carbon dioxide and ethanol to obtain expanded polyetherimide particles; wherein, the high-pressure mixed fluid is The volume ratio of supercritical fluid carbon dioxide and ethanol is 3:1, which is a saturated high-pressure mixed fluid.

Embodiment 2

[0033] A preparation method of polyetherimide expanded particles, the preparation method comprising the steps of:

[0034] S21: Obtain polyetherimide raw materials.

[0035] S22: put the polyetherimide raw material into an extruder, and extrude the polyetherimide raw material into thermoplastic polyetherimide particles by melt extrusion;

[0036] S23: Put the above-mentioned thermoplastic polyetherimide particles into an autoclave at a pressure of 15 MPa, inject a high-pressure mixed fluid composed of supercritical fluid carbon dioxide and ethanol to obtain expanded polyetherimide particles; wherein, the high-pressure mixed fluid is The volume ratio of supercritical fluid carbon dioxide and ethanol is 2:1, which is a saturated high-pressure mixed fluid.

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Abstract

The invention belongs to the technical field of thermoplastic materials, and in particular relates to a preparation method for polyetherimide foam particles. The preparation method comprises the following steps: obtaining a polyetherimide raw material; performing extrusion on the polyetherimide raw material to form thermoplastic polyetherimide particles by adopting a melt extrusion method; and injecting the thermoplastic polyetherimide particles into a high-pressure mixed fluid composed of supercritical fluid carbon dioxide and an organic solvent to obtain the polyetherimide foam particles. The method provided by the invention can significantly improve solubility of polyetherimide to a carbon dioxide physical foaming agent, and reduce foaming temperature, so that the polyetherimide can realize high-rate expansion at lower foaming temperature, and the polyetherimide foam particle material having a high expansion degree, a smooth and clean surface, soft texture, a uniform foam structure,a large foam density and excellent tensile properties is obtained.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic materials, and in particular relates to a preparation method of polyetherimide expanded particles. Background technique [0002] Polyetherimide (PEI for short) is a super engineering plastic made of amorphous polyetherimide. Polyetherimide foam has excellent high and low temperature resistance, self-flammability, low smoke and non-toxic, Radiation resistance and other characteristics, so it is widely used in high-tech fields such as aviation, aerospace, ships, rail transit and so on. The main preparation route of polyetherimide foam is to obtain polyetherimide acid through polymerization of small molecule dianhydride and diamine monomer, and polyetherimide acid is cross-linked while foaming in the subsequent imidization process. , thus preparing polyetherimide foam. Due to problems such as long technical route, low production efficiency, incomplete imidization, difficult removal of high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L79/08
CPCC08J9/122C08J2203/06C08J2203/08C08J2379/08
Inventor 常健飞徐永
Owner SHENZHEN YATAIXING IND
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