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Polyimide composite material and preparation method thereof

A composite material and polyimide technology, applied in the field of polyimide, can solve the problems of high carbon fiber weaving cost, improved dimensional stability, low linear expansion coefficient, etc., achieve dimensional stability, improve dimensional stability, and thermal expansion coefficient small effect

Pending Publication Date: 2021-11-23
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite-filled polyimide (PMDA-ODA) composite materials have excellent heat resistance, lubrication, wear resistance and other properties, and the short-term use temperature can reach above 450 ° C, but this type of material has a large thermal expansion coefficient and dimensional stability at high temperatures Poor, and the production process is complicated, requiring special molding and processing processes, so the manufacturing cost is high, and it is difficult to achieve continuous mass production
The fiber braided reinforced polyimide composite material has excellent mechanical properties and good durability, and the thermosetting polyimide resin matrix has good heat resistance, and the service temperature can reach up to 360-370 ° C. It also has a low friction coefficient and is compatible with graphite Compared with filled linear polyimide composite materials, it has extremely low linear expansion coefficient and significantly improved dimensional stability, but the high cost of carbon fiber braiding and complicated manufacturing process have greatly restricted the application of fiber braided composite materials.

Method used

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  • Polyimide composite material and preparation method thereof
  • Polyimide composite material and preparation method thereof
  • Polyimide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The copper nanofibers were cleaned in alcohol for 10 min and then dried for 3 h.

[0037] Dry PMDA-ODA polyimide resin, flake graphite, and carbon fiber at 150° C. for 5 hours.

[0038] The raw materials obtained after the above-mentioned steps are added into a high-speed mixer, and uniformly mixed at normal temperature to obtain a mixed material. Raw material parts by weight are as follows:

[0039] PMDA-ODA type polyimide resin 58 parts

[0040] 30 parts of flake graphite

[0041] carbon fiber 10 parts

[0042] Copper nanofiber 2 parts.

[0043] According to the specific prepared parts, the material is hot-pressed, and the hot-pressing process is:

[0044] Coat the inner surface of the mold with a silicone oil high-temperature release agent, add the above-mentioned mixed materials into the mold, and perform hot-press molding. The molding temperature is 410°C, the pressure is 90MPa, and the time is 1.5h.

Embodiment 2

[0046] The aluminum nanofibers were cleaned in alcohol for 8 min and then dried for 3 h.

[0047] Dry PMDA-ODA polyimide resin, flake graphite, and carbon fiber at 150° C. for 5 hours.

[0048] The raw materials obtained after the above-mentioned steps are added into a high-speed mixer, and uniformly mixed at normal temperature to obtain a mixed material. Described raw material parts by weight are as follows:

[0049] PMDA-ODA type polyimide resin 78 parts

[0050] 10 parts flake graphite

[0051] Carbon fiber 8 parts

[0052] Aluminum nanofiber 4 parts.

[0053] According to the specific prepared parts, the material is hot-pressed, and the hot-pressing process is:

[0054] Coat the inner surface of the mold with a silicone oil high-temperature release agent, add the above-mentioned mixed materials into the mold, and perform hot-press molding. The molding temperature is 420°C, the pressure is 70MPa, and the time is 2h.

Embodiment 3

[0056] The stainless steel nanofibers were cleaned in alcohol for 10 min and then dried for 2 h.

[0057] Dry PMDA-ODA polyimide resin, amorphous graphite, and carbon fiber at 170° C. for 3.5 hours.

[0058] The raw materials obtained after the above-mentioned steps are added into a high-speed mixer, and uniformly mixed at normal temperature to obtain a mixed material. Described raw material parts by weight are as follows:

[0059] PMDA-ODA type polyimide resin 71 parts

[0060] 15 parts of amorphous graphite

[0061]carbon fiber 10 parts

[0062] Stainless steel nanofiber 4 parts.

[0063] According to the specific prepared parts, the material is hot-pressed, and the hot-pressing process is:

[0064] Coat the inner surface of the mold with a silicone oil high-temperature release agent, add the above-mentioned mixed materials into the mold, and perform hot-press molding. The molding temperature is 410°C, the pressure is 80MPa, and the time is 1.5h.

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Abstract

The invention relates to the field of polyimide, in particular to a polyimide composite material and a preparation method thereof. Compared with a traditional graphite-filled polyimide composite material, the low-thermal-expansion-coefficient polyimide composite material provided by the invention is simple in production process and relatively low in thermal expansion coefficient. According to the technical scheme, the low-thermal-expansion-coefficient high-temperature-resistance polyimide composite material is prepared from the following raw materials in percentage by weight: 54 to 83 percent of polyimide resin; 10 to 30 parts of graphite; 5 to 10 parts of carbon fiber; and 2 to 6 parts of metal nanofiber. On the basis of traditional graphite-filled high-temperature-resistant polyimide, the carbon fibers and the metal nanofibers are added at the same time, the mechanical property of the material can be improved, the thermal expansion coefficient of the material can be reduced by 20% or above, and the dimensional stability of the material at the high temperature is greatly improved.

Description

technical field [0001] The invention relates to the field of polyimide, in particular to a polyimide composite material and a preparation method thereof. Background technique [0002] Polyimide resin has excellent heat resistance and mechanical properties, and has always been the focus of research on high temperature resistant composite materials for aero-engines. Polyimide can be used in the range of 280-450 ° C. Polyimide-based composite materials have good mechanical and electrical properties, high specific strength and specific stiffness, excellent thermal and chemical stability, and small thermal expansion coefficient , strong solvent resistance, high dimensional stability, and easy to form parts with complex shapes. It is currently a widely used structural resin-based composite material for aero-engines. PMDA-ODA polyimide resin, which is polycondensed from pyromellitic anhydride (PMDA) and 4,4-diaminodiphenyl ether (ODA), has a large molecular structure, regular and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/06C08K7/00C08K3/04C08J5/04
CPCC08J5/042C08J5/041C08J5/047C08J2379/08C08K7/06C08K7/00C08K3/04C08K2201/014C08K2201/011
Inventor 孟思益罗熙雯王芳周利庄
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD