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Thermosetting polyimide with high glass transition temperature and high heat resistance, and preparation method thereof

A technology with high transition temperature and high vitrification, which is applied in the field of polymer materials to achieve the effects of small steric hindrance, good cross-linking effect, and increased glass transition temperature

Active Publication Date: 2018-12-18
HANGZHOU FIRST ELECTRONIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the processing temperature of OLED panels is at least 450°C, so PI needs to have higher heat resistance, and the 1% thermal weight loss temperature is above 550°C; while conventional PI films cannot meet such requirements

Method used

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  • Thermosetting polyimide with high glass transition temperature and high heat resistance, and preparation method thereof
  • Thermosetting polyimide with high glass transition temperature and high heat resistance, and preparation method thereof
  • Thermosetting polyimide with high glass transition temperature and high heat resistance, and preparation method thereof

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Embodiment 1-20

[0057] [Polyimide A-T] was prepared according to the input amount of raw materials in Table 1 and the following experimental procedures:

[0058] Under a nitrogen atmosphere, in a 100mL three-necked flask, dissolve the quantitative aromatic diamine compounds shown in Table 1 in 40g of a strong polar solvent (such as NMP) while stirring, so that the mass of the aromatic diamine compounds The percentage is 5%-10%. Then add the quantitative 4,4'-(acetylene-1,2-diyl) diphthalic anhydride shown in Table 1, and add the quantitative aromatic tetracarboxylic dianhydride compounds shown in Table 1 three times at the same time. They are respectively 60%, 30%, and 10% of the total weight. During the process of stirring and adding, control the temperature of the solution at 60-80°C. Afterwards, it was stirred for 24-48h under a nitrogen atmosphere for amic acid reaction.

[0059] After the above reaction is completed, reduce the temperature of the reaction solution below 40°C. Afterwa...

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Abstract

The invention discloses a thermosetting polyimide with a high glass transition temperature and a high heat resistance, and a preparation method thereof. An alkynyl anhydride compound is introduced into a PI molecular chain, and a crosslinking reaction of an alkynyl functional group is carried out to obtain the thermosetting polyimide having a network crosslinked structure. The polymerization process of a polyimide precursor and separation of an imidization process and a crosslinking process are controlled to make the network crosslinked structure of the polyimide tend to be complete. The thermosetting polyimide in the invention forms the network crosslinked structure, so the glass transition temperature is high, and even a significant glass transition process disappears; the heat resistance is improved; and the CTE is also kept close to that of the glass. The thermosetting polyimide with the high glass transition temperature and the high heat resistance in the invention keeps the performances of a film stable in the high-temperature processing process, meets the requirements of a flexible OLED panel product for a flexible substrate, and ensures the application in the OLED panel.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a thermosetting polyimide which can be used as a substrate material in a flexible display panel and an OLED display panel and a preparation method thereof. Background technique [0002] Compared with cathode ray picture tube CRT, liquid crystal display LCD and other display technologies, flexible display screen, as an emerging display device, no longer uses rigid support substrate materials such as glass, steel plate, and hard plastic, and is flexible, foldable, thin, and portable. , non-fragile and other advantages, has been widely concerned. In particular, the active matrix organic light-emitting diode panel AMOLED, which is called the next-generation display technology, has faster response speed, higher contrast ratio, and wider viewing angle than TFT LCD in terms of display performance; TFT LCD is lighter and thinner; it is much more advanced in terms of image quality, perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08J3/24C08L79/08
CPCC08G73/1007C08G73/1078C08J3/24C08J3/247C08J5/18C08J2379/08
Inventor 周慧李营翁建东童荣柏周光大林建华
Owner HANGZHOU FIRST ELECTRONIC MATERIAL CO LTD
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