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Polyimide composite material and preparation method and application thereof

A composite material and polyimide technology, applied in the field of polyimide composite materials, can solve the problems of toxic heavy metal ions, poor mechanical properties and heat resistance, and unsatisfactory radiation resistance.

Inactive Publication Date: 2015-09-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Technical problem: The purpose of this invention is to overcome the shortcomings of traditional neutron radiation shielding materials such as poor mechanical properties and heat resistance, unsatisfactory radiation resistance, and poisonous heavy metal ions, and provide a kind of mechanical properties and heat resistance. A carbon nanotube-bonded, nanoclay-doped polyimide composite material with strong light performance and no toxic metals, and a preparation method of the material and its application in neutron radiation shielding

Method used

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

Examples

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preparation example Construction

[0043] The preparation method of the polyimide composite material bonded by aminated carbon nanotubes of the present invention, the steps are:

[0044] 1. Recrystallize ODA, PMDA or BPDA with ethanol and acetic anhydride respectively, and seal them for storage.

[0045] 2. Remove the water in N,N'-dimethyl-2-pyrrolidone by vacuum distillation, and store the redistilled NMP in a desiccator.

[0046] 3. Dissolve M g of ODA in X g redistilled NMP. Magnetic or mechanical stirring.

[0047] 4. Add aminated carbon nanotubes (amination rate a) Y g to the system, and ultrasonically disperse evenly after stirring, then add dried nanoclay Z g to the system, and ultrasonically disperse the system for another 2 hours.

[0048] 5. Add N g of PMDA or BPDA to the system in batches. Let it react completely. Wherein when the dianhydride monomer is PMDA: M / 200+Ya / 16=N / 218; when the dianhydride monomer is BPDA: M / 200+Ya / 16=N / 294. Furthermore, (M+N+Y+Z) / (M+N+Y+X+Z)=0.1, that is, the solid co...

Embodiment 1

[0053] Embodiment 1: the preparation of the polyimide composite film whose mass content of aminated carbon nanotube is 5%, the mass fraction of nanoclay is 15%, the size is 5 × 5 × 1 cm, and the dianhydride monomer is PMDA , its preparation steps are:

[0054] (1) Recrystallize an appropriate amount of PMDA and ODA with acetic anhydride and ethanol, respectively. And a certain amount of polar solvent N-methylpyrrolidone (NMP) was distilled under reduced pressure.

[0055] (2) Add 15.2817g (0.0764mol) of diamine to a 500ml three-necked flask equipped with mechanical stirring, and add 400ml of distilled solvent NMP. After the diamine was dissolved by mechanical stirring, 2g of aminated carbon nanotubes (amination rate of 0.45wt%) was firstly added, and after the dispersion was uniform, 6g of dried nanoclay was added, and ultrasonically dispersed. 16.7183 g (0.0767 mol) of dianhydride were slowly added in portions. The reaction was stirred at room temperature for 5 hours to ob...

Embodiment 2

[0057] Embodiment 2: the mass content of aminated carbon nanotube is 10%, the mass fraction of nanoclay is 10%, the size is 5 * 5 * 1cm, and the dianhydride monomer is the preparation of the polyimide composite film of PMDA , its preparation steps are:

[0058] (1) Recrystallize an appropriate amount of PMDA and ODA with acetic anhydride and ethanol, respectively. And a certain amount of polar solvent N-methylpyrrolidone (NMP) was distilled under reduced pressure.

[0059] (2) Add 15.2523g (0.0762mol) of diamine into a 500ml three-necked flask equipped with mechanical stirring, and add 400ml of distilled solvent NMP. After the diamine was dissolved by mechanical stirring, 4g of aminated carbon nanotubes (amination rate of 0.45wt%) was added first, and after being uniformly dispersed, 4g of oven-dried nanoclay was added, and ultrasonically dispersed. 16.7477 g (0.0768 mol) of dianhydride were slowly added in portions. The reaction was stirred at room temperature for 5 hours ...

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Abstract

The invention discloses a polyimide composite material. Aminated carbon nanotube and diaminodiphenyl ether, which are used cooperatively as diamine, and another dianhydride monomer, namely PMDA (pyromellitic dianhydride) or BPDA (3,3',4,4'-biphenyltetracarboxylic anhydride), are polymerized to form polyamide acid; and during the process of forming a polyamide acid solution, nano-clay is added, and the composite material is formed by a hot-pressing technology after amidation of the system. The aminated carbon nanotube is directly bonded to the polyimide system through chemical bonding, but nano-clay is doped to the polyimide system through physical function. The aminated carbon nanotube-bonded and nano-clay-doped polyimide material obtained by the above method has good thermal neutron shielding property. The invention also discloses a preparation method of the above aminated carbon nanotube-bonded and nano-clay-doped polyimide material and its application in neutron radiation shield.

Description

technical field [0001] The invention relates to a polyimide composite material bonded by aminated carbon nanotubes and doped with nanoclay, in particular to a composite polyimide material bonded by aminated carbon nanotubes and doped with nanoclay , preparation method and neutron radiation shielding application thereof. Background technique [0002] Neutrons have no charge and do not interact with electrons outside the nucleus, only with the nucleus. According to the energy, it can be divided into slow neutrons (energy 0.5 ~ 1.0keV), medium energy neutrons (energy 1.0keV ~ 0.5MeV) and fast neutrons (energy greater than 0.5MeV). The mass of neutron is very close to that of proton, so paraffin, polyethylene, polypropylene and boron with higher hydrogen content are excellent neutron shielding materials. [0003] In recent years, the harmful effects of various radiation, especially neutron radiation, on human body and environmental organisms have gradually been recognized by p...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K9/04C08K7/24C08K3/34C08G73/10
CPCC08K9/04C08G73/1071C08K3/346C08K7/24C08K2201/011C08L2201/08C08L79/08
Inventor 杨洪宗德超郭玲香林保平
Owner SOUTHEAST UNIV
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