Polyimide composite film with electromagnetic shielding function and preparation method thereof

A technology of polyimide and composite film, which is applied in the field of electromagnetic shielding film and its preparation through composite modification of polyimide by nano-filling, can solve the problems of large coating thickness and restricted application fields, and achieve uniform performance, The effect of implementing mild conditions and increasing the fill factor

Inactive Publication Date: 2015-11-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to most coatings, the coating thickness of this invention is relatively large, which limits the field of its application

Method used

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  • Polyimide composite film with electromagnetic shielding function and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, 41.647 g of tetraacicular zinc oxide (T-ZnOw) was weighed and placed in a vacuum oven at a constant temperature of 105° C. for 8 hours. Then put it into 89.0213g of DMAc, add 1.5617g of coupling agent KH550 at the same time, ultrasonically stir at 10°C for 10min, and the ultrasonic frequency is 20KHz. Add 4.2359g ODA, continue to stir ultrasonically, the ultrasonic frequency is 20KHz, the temperature is controlled at 10°C, after it is completely dissolved, add 4.6141g of dianhydride monomer PMDA in an equimolar amount to ODA in 3 batches, and the ultrasonic frequency is 20KHz, the temperature is controlled Stir continuously at 10° C. for 4 h to form a homogeneous phase, and prepare 141.08 g of a PAA / T-ZnOw-ZnO composite solution with a solid content of 37%.

[0037] Coat the composite solution on a glass plate, put it into a vacuum oven and raise the temperature step by step at a rate of 2.5°C / min (100°C×40min, 220°C×30min, 320°C×30min), dehydration and cyclizati...

Embodiment 2

[0039] First, 0.774 g of tetraacicular zinc oxide (T-ZnOw) and 0.1915 g of silver oxide (AgO) were weighed and placed in a vacuum oven at a constant temperature of 100° C. for 6 hours. Then put it into 77.4g DMAc, add 0.002g coupling agent KH560 at the same time, stir ultrasonically at 15°C for 15min, and ultrasonic frequency is 40KHz. Add 8.8016g of BAPB, continue to stir ultrasonically, the ultrasonic frequency is 40KHz, and the temperature is controlled at 15°C. After it is completely dissolved, add a total of 9.5787g of dianhydride monomer BPDA with a molar ratio of 1.05:1 to BAPB in 5 batches. 40KHz, temperature controlled at 15°C, continuous stirring for 3h to form a homogeneous phase, and 96.739g of a PAA / T-ZnOw-AgO composite solution with a solid content of 20% was obtained.

[0040] Coat the composite solution on a glass plate, put it into a vacuum oven to raise the temperature step by step, the heating rate is 2°C / min (120°C×40min, 180°C×40min, 280°C×40min), dehydrat...

Embodiment 3

[0042] First, 55.2 g of tetraacicular zinc oxide (T-ZnOw), 6.9 g of granular zinc oxide (ZnO) and 6.9 g of nickel oxide (NiO) were weighed and placed in a vacuum oven at a constant temperature of 105° C. for 6 h. Then put it into 134.7714g DMF, add 0.6g coupling agent KH560 at the same time, stir ultrasonically at 20°C for 18min, ultrasonic frequency 60KHz. Add 7.618g of MDA, continue to stir ultrasonically, the ultrasonic frequency is 60KHz, and the temperature is controlled at 20°C. After it is completely dissolved, add 12.6296g of dianhydride monomer BTDA with a molar mass ratio of 1.02:1 to MDA in 7 batches. The frequency was 60KHz, the temperature was controlled at 20°C, and the mixture was continuously stirred for 3.5h to form a homogeneous phase, and 224.619g of a PAA / T-ZnOw-ZnO-NiO composite solution with a solid content of 40% was prepared.

[0043] Coat the composite solution on a stainless steel casting plate, put it into a vacuum oven to raise the temperature step ...

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Abstract

The invention relates to a polyimide film with an electromagnetic shielding function and a preparation method thereof. The polyimide composite film is characterized by being composed of the following components in percentage by weight: 17 to 95% of polyimide, 4 to 80% of nano filler (tetrapod-like zinc oxide), 0 to 75% of other nano filler, and 0.01 to 3% of coupling agent. The target product is obtained through an in-situ polymerization method and thermal imidization. The reaction raw materials comprise diamine, dianhydride, nano filler dispersed in polymer, and a coupling agent for improving the dispersibility. The reaction process is controller, the doping amount of nano filler is high, the components in the composite material are evenly mixed, the structure and property of the film are stable, moreover, the film has an electromagnetic shielding function, and thus the film has a high application value in the fields of electronic/electromagnetic shielding and electrochemistry.

Description

technical field [0001] The invention relates to a polyimide film with electromagnetic shielding function and a preparation method thereof, in particular to a composite modified polyimide electromagnetic shielding film through nanometer filling and a preparation method thereof. Background technique [0002] With the rapid development of the communication market and continuous innovation of product technology, the requirements for materials for high-frequency and high-speed signals are also increasing. Whether it is a designer or a flexible circuit board (FPC) manufacturer, they are faced with choosing an appropriate material to meet the high requirements. Frequency signal characteristics, but easy to manufacture and process, low cost. However, such materials are often susceptible to electromagnetic interference (EMI) (also known as electromagnetic pollution). EMI will cause misoperation of various electronic devices, distortion of images or sound signals, or even failure to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G73/10C08K9/06C08K3/22
Inventor 黄培俞娟
Owner NANJING UNIV OF TECH
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