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Title:
PREPARATION METHOD FOR POLYIMIDE RESIN AND THIN FILM THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/228449
Kind Code:
A1
Abstract:
The present disclosure relates to the field of polyimide, and in particular to a preparation method for a polyimide resin and a thin film thereof. The method comprises the following steps: S1, upon dissolving a first batch of polydiamine in a solvent under an inert gas atmosphere, adding polydianhydride in a low-temperature environment of 30°C or below for preliminary polymerization to form a resin solution, wherein the polydianhydride is 105-110% of the total molar amount of the first batch of polydiamine and the viscosity of the resin solution is controlled to be 50,000-70,000 cps; S2, monitoring the viscosity of the resin solution and gradually raising the temperature of the resin solution within 30-80°C, and gradually adding a second batch of polyamine in batches in order of descending amounts until the viscosity of the resin solution is 180,000-200,000 cps; and S3, adding a fluorine-containing capping agent, performing uniform mixing, and performing high-vacuum defoaming to obtain a polyimide resin solution. When the polyimide resin prepared in the present disclosure is coated on a base film to prepare a thin film, a formed polyimide coating has strong thermal stability a coefficient of thermal expansion close to that of the base film, and the problem that the edge of the thin film generated in the case of a relatively large difference in coefficients of thermal expansion is prone to curl and shrink is solved.

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Inventors:
CHENG YUE (CN)
WU CHAO (CN)
LV KAI (CN)
LIU QIANQIAN (CN)
ZHUANG ZHI (CN)
Application Number:
PCT/CN2022/089436
Publication Date:
November 03, 2022
Filing Date:
April 27, 2022
Export Citation:
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Assignee:
SHANGHAI RUIJI NEW MATERIAL TECH CO LTD (CN)
International Classes:
C08G73/10
Domestic Patent References:
WO2020022410A12020-01-30
Foreign References:
CN106810692A2017-06-09
US20020045033A12002-04-18
CN1978487A2007-06-13
CN1886444A2006-12-27
CN102766260A2012-11-07
CN107266688A2017-10-20
CN113201136A2021-08-03
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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