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A kind of high insulation matt black polyimide film and preparation method thereof

A black polyimide, high-insulation technology, applied in the field of high-insulation matt black polyimide film and its preparation, can solve the problems of low insulation of matt black PI film, unable to meet the needs of consumers, etc. Reduce the generation of pinholes and air bubbles, improve insulation, and avoid the effect of self-agglomeration

Active Publication Date: 2021-03-05
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the method described in the above invention cannot solve the needs of consumers in the prior art
[0010] Therefore, how to solve the low insulation of matt black PI film and further reduce the incidence of pinholes and air bubbles has become a difficult problem for the quality improvement of matt black PI film products in my country.

Method used

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  • A kind of high insulation matt black polyimide film and preparation method thereof
  • A kind of high insulation matt black polyimide film and preparation method thereof
  • A kind of high insulation matt black polyimide film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Preparation of nanocomposite sol:

[0044] Mix 500g of absolute ethanol and 22g of deionized water evenly, add 84g of ethyl orthosilicate, then adjust the pH of the system to 5 with acetic acid, stir and react for 5h, then add 5g of KH550, continue stirring for 20h to obtain a nanocomposite sol, spare;

[0045] 2) Preparation of black filler dispersion:

[0046] 2.1) Mix 4.2kg carbon black (primary particle size is 20nm) and 38kg DMAc evenly, use high-speed shearing machine to shear and disperse (rotating speed is 2000r / min, dispersion time is 2h), and then use homogenizer to disperse (pressure is 50MPa, and the homogenization time is 20min), to obtain a black dispersion, for subsequent use;

[0047] 2.2) Mix 4.2kg of silicon dioxide (average particle size of 4 μm) and 24kg of DMAc evenly, place in a high-speed shearing machine and shear and disperse at a speed of 3000r / min for 3h to obtain a white dispersion, which is set aside;

[0048] 2.3) Mix the black disper...

Embodiment 2

[0052]Repeat Example 1, the difference is:

[0053] In step 1), the non-metal alkoxide is butyl titanate, the amount of deionized water is 11g, the pH of the adjustment system is 6, and the amount of KH550 is 3g;

[0054] In step 2) and 3), the polar aprotic solvent is changed to NMP;

[0055] Step 3) in, the total amount of PMDA is 0.1994mol.

Embodiment 3

[0057] Repeat Example 1, the difference is:

[0058] In step 1), the consumption of deionized water is 1.7g, the consumption of KH550 is 6g, and the silane coupling agent is KH560, and its consumption is 1.3g;

[0059] In step 2.1), the primary particle size of carbon black is 300nm.

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Abstract

The invention discloses a high-insulating matte black polyimide thin film and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing non-metallic alkoxide, absolute ethyl alcohol and water, regulating the pH to be 5 to 7, adding a silane coupling agent, and stirring for reacting to obtain nano-composite sol; (2) mixing a black dispersion liquid with the solute of carbon black and a white dispersion liquid with the solute of a delustering agent, performing shear-dispersing and / or ultrasonic dispersing on the obtained mixed solution, adding the nano-composite sol, and performing the shear-dispersing and / or ultrasonic dispersing to obtain a black filler dispersion liquid; (3) adding the black filler dispersion liquid into a PAA resin solution,stirring uniformly, and then adding or not adding a stabilizing agent, and stirring uniformly to obtain matte black PAA resin solution; and (4) further preparing the matte black PAA resin solution into a matte black PI (Polyimide) thin film. The thin film prepared by adopting the method disclosed by the invention has excellent insulating property, high mechanical property and low pinhole and bubble rate.

Description

technical field [0001] The invention relates to a polyimide film, in particular to a high-insulation matte black polyimide film and a preparation method thereof. Background technique [0002] With people's pursuit of high-grade appearance and texture of electronic products, matte black appearance with soft gloss appears to lead the trend of taste, and people begin to use matte black polyimide (PI) film in electronic circuit boards to cover flexible circuit boards, Electronic materials such as electronic components, lead frames of integrated circuit packages, etc., to achieve the purpose of preventing visual inspection and tampering. At present, the thickness of the matte black PI film with the largest sales in the electronic product industry on the market is 12.5 μm, and there is still a big gap between domestic film and imported film in terms of performance and appearance quality. As a key performance of polyimide film technical indicators for electronic products, electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K9/10C08K3/04C08K5/526C08K3/36C08K3/22C08J5/18C08G73/10
CPCC08G73/1007C08G73/1071C08J5/18C08J2379/08C08K3/04C08K3/36C08K5/526C08K9/10C08K2003/2241
Inventor 青双桂蒋耿杰周福龙白小庆马纪翔全光好
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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