Magnetic field induced fiber reinforced polyimide composite material and preparation method thereof

A polyimide and fiber-reinforced technology, which is applied in the field of magnetic field-induced fiber-reinforced polyimide composite materials and its preparation, can solve the problem that the impact resistance performance cannot meet the use requirements, and achieve good impact resistance and excellent mechanical properties , Improve the effect of creep resistance

Inactive Publication Date: 2019-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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 provide a magnetic field-induced fiber-reinforced polyimide that can not only meet the requirements of impact resistance performance but also meet the wear resistance in view of the problem that the impact resistance performance of the existing ultrasonic motor cannot meet the use requirements in precise strike applications Composite materials, while providing a corresponding preparation method

Method used

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  • Magnetic field induced fiber reinforced polyimide composite material and preparation method thereof
  • Magnetic field induced fiber reinforced polyimide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A magnetic field-induced fiber-reinforced polyimide composite material is prepared by the following steps:

[0026] 1) Disperse 0.02 g of magnetic Fe3O4 nanoparticles and 0.2 g of chopped carbon fibers in 50 ml of anhydrous ethanol solution for ultrasonic stirring, and then dry to obtain magnetic Fe3O4 nanoparticles loaded on the surface of carbon fibers for use.

[0027] 2) Put the two monomers of ODA and PMDA in a vacuum drying oven at 80±10°C for 2 hours and store for later use; add 2.18g of dried PMDA to 20 ml of DMA solution, add 2g of ODA after dissolution, and Stir in an ice-water bath for 8 ± 0.5 hours to synthesize polyamic acid, add 5% w.t. carbon fiber coated with iron tetraoxide to the polyamic acid, continue stirring for 2 ± 0.5 hours, and then spread it on a dry and clean glass plate. The sample was placed in a constant magnetic field (field strength of 100 gauss) and heated in a vacuum drying oven until the solvent was volatilized. Finally, the temperatur...

Embodiment 2

[0030] A magnetic field-induced fiber-reinforced polyimide composite material is prepared by the following steps:

[0031] 1) Disperse 0.04g of magnetic Fe3O4 nanoparticles and 0.4g of chopped carbon fibers in 50 ml of anhydrous ethanol solution with ultrasonic stirring, and then dry to prepare magnetic Fe3O4 nanoparticles loaded on the surface of carbon fibers for use.

[0032] 2) Put the two monomers ODA and PMDA in a vacuum oven at 80°C to dry for 2 hours, and store for later use; add 2.18g of dried PMDA to 23 ml of DMA solution, add 2g of ODA after dissolution, and place in an ice-water bath Stir in medium for 8 hours to synthesize polyamic acid, add 10% w.t. carbon fiber coated with iron tetroxide to polyamic acid, continue to stir for 2 hours, spread it on a dry and clean glass plate, put the sample in a constant magnetic field (The field strength is 120 gauss) Heating in a vacuum drying oven until the solvent is volatilized, and finally raising the temperature to 380°C ...

Embodiment 3

[0035] A magnetic field-induced fiber-reinforced polyimide composite material is prepared by the following steps:

[0036] 1) Disperse 0.08g of magnetic Fe3O4 nanoparticles and 0.8g of chopped carbon fibers in 50 ml of anhydrous ethanol solution with ultrasonic stirring, and then dry to obtain magnetic Fe3O4 nanoparticles loaded on the surface of carbon fibers for use.

[0037] 2) Put the two monomers ODA and PMDA in a vacuum oven at 80°C to dry for 2 hours, and store them for later use; add 2.18g of dried PMDA to 24 ml of DMA solution, add 2g of ODA after dissolution, and place in an ice-water bath Stir in medium for 8 hours to synthesize polyamic acid, add 20% w.t. carbon fiber coated with iron tetraoxide to polyamic acid, continue stirring for 2 hours, spread it on a dry and clean glass plate, put the sample in a constant magnetic field (The field strength is 180 gauss) Heating in a vacuum drying oven until the solvent volatilizes, and finally raising the temperature to 380...

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Abstract

The invention belongs to the field of polymer composite materials, and relates to a magnetic field induced fiber reinforced composite material used for an ultrasonic motor and a preparation method thereof. The method includes coating chopped carbon fibers with ferric ferrous oxide nanoparticles, performing dispersion in polyamide acid in-situ synthesis, allowing the carbon fibers to be orderly arranged under the function of an external magnetic field, and preparing the composite material through thermal imidization. The anisotropy of this product can endow the composite material with good impact resistance, wear resistance and other characteristics. The composite material can greatly improve the motion conversion efficiency, load bearing capacity, running stability and service lifetime ofthe ultrasonic motor.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, in particular to a composite material for an ultrasonic motor, in particular to a magnetic field-induced fiber-reinforced polyimide composite material and a preparation method thereof. Background technique [0002] With the urgent demand for precise driving components (ultrasonic motors), especially the impact resistance of ultrasonic motors is high, otherwise the ultrasonic motors are prone to damage and failure under large impacts. In addition to structural design protection, strict requirements are placed on the impact resistance of friction materials. Traditional polymer materials have low hardness and poor impact resistance, which cannot meet the requirements for use under large impact conditions. Therefore, the development of impact-resistant friction materials has important practical significance and application prospects for improving the performance of ultrasonic motors and dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08K7/06C08K9/12C08K3/22C08K9/10C08J5/06C08J3/28C08G73/10C09K3/14
CPCC08G73/1071C08J3/28C08J5/06C08J2379/08C08K7/06C08K9/10C08K9/12C08K2003/2275C08K2201/011C09K3/14
Inventor 赵盖宋敬伏雷浩余元豪丁庆军裘进浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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