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公开(公告)号：US20230174735A1
公开(公告)日：2023-06-08
申请号：US18102921
申请日：2023-01-30
发明人： Dae Ho LEE , Moon Jung JO , Se Won HAN , Seung Gun YU , Hyo Yul PARK
IPC分类号： C08J9/28
CPC分类号： C08J9/28 , C08J2205/026 , C08J2205/05 , C08J2379/08
摘要： The present invention relates to: a method for producing a polyimide aerogel having low dielectric properties, high insulation, and high strength; and a polyimide aerogel prepared therefrom. The present invention has the technical gist of a method for producing a polyimide aerogel having low dielectric properties, high insulation, and high strength, and a polyimide aerogel prepared therefrom, the method including: a first step of preparing a solvent; a second step of preparing a polyamic acid resin by reacting a diamine-based monomer with an acid anhydride monomer in a solvent; a third step of preparing a polyimide resin solution by imidizing the polyamic acid resin at 150 to 200° C.; a fourth step of preparing a polyimide wet gel by mixing a crosslinking agent and an acid with the polyimide resin solution; and a fifth step of preparing a polyimide aerogel by replacing the solvent contained in the polyimide wet gel with a main substitution solvent and a minor substitution solvent and then drying, wherein, in the fifth step, the main substitution solvent and the minor substitution solvent are each added to the polyimide wet gel in a stepwise manner to produce a polyimide aerogel having the porosity of 80 to 85 vol % while forming a skeletal structure having nano-pores through solvent-exchange.
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2.发明申请公开(公告)号：US20210308647A1
公开(公告)日：2021-10-07
申请号：US17238426
申请日：2021-04-23
发明人： Dae Ho LEE , Moon Jung JO , Hyo Yul PARK , Seung Gun YU , Se Won HAN
摘要： Proposed are a polyimide aerogel having a controlled particle size and pore structure, and a method for producing the same. More particularly, proposed are a polyimide aerogel in which not only can the particle size of a polyimide resin be controlled, but the pore structure of the polyimide aerogel can also be controlled through an organic solvent mixture, and a method for producing the polyimide aerogel. This can be achieved through: a first step of preparing a solvent; a second step of synthesizing a polyamic acid resin by reacting a diamine-based monomer and an acid anhydride monomer in the solvent; a third step of forming a polyimide resin through imidization of the polyamic acid resin by subjecting the polyamic acid resin to a high-temperature reaction at 150 to 200° C.; a fourth step of forming a polyimide wet-gel by crosslinking the polyimide resin; and a fifth step of forming a polyimide aerogel by replacing the solvent included in the polyimide wet-gel with a solvent having a relatively lower boiling point than the solvent included in the polyimide wet-gel and then removing the solvent.
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