Low-thermal-expansion transparent polyimide film and preparation method thereof
A technology of transparent polyimide and polyimide film, which is applied in the direction of instruments, identification devices, etc., and can solve the problems of device display accuracy reduction, layer-to-layer peeling, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0119] The present invention also provides a method for preparing the above-mentioned transparent polyimide film with high strength and low thermal expansion, comprising the following steps:
[0120] The dianhydride monomer and the diamine monomer are polycondensed and then imidized to obtain polyimide;
[0121] The dianhydride monomer has a structure shown in formula VII:
[0122]
[0123] in At least one selected from the following amide-containing structural groups:
[0124]
[0125] R 1 , R 2 , R 3 , R 4 independently selected from hydrogen, alkyl, cycloalkyl, fluoroalkyl, ester or halo; preferably -H, -F, CH 3 or -CF 3 ;
[0126] The diamine monomer has a structure shown in formula VIII:
[0127] h 2 N-Ar 2 -NH 2 Formula VIII
[0128] —Ar 2 - selected from one of the structural groups shown in formula II to formula IV:
[0129]
[0130] In formula II, R 5 for
[0131] R 6 selected from hydrogen, alkyl, cycloalkyl, fluoroalkyl, ester or halo;...
Embodiment 1
[0192] Add 2.27g of diamine compound (1), 3.20g of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, 80.0g of dimethylacetamide to the reaction vessel, at 20°C, Stir to dissolve. Add 2.34g of dianhydride compound (8) and 6.66g of 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride in sequence, polymerize for 24 hours, and test the rotational viscosity to reach 4.0×10 4 mPa / s, forming the precursor solution of transparent polyimide. Test its logarithmic viscosity.
[0193] Add 10.20 g of acetic anhydride and 5.05 g of triethylamine to this precursor solution, and carry out chemical imidization reaction for 2 h. After imidization is completed, a polyimide solution is obtained. This solution was slowly poured into ethanol. A white filamentary precipitate precipitated. The filamentous precipitate was filtered off and dried. Obtain transparent polyimide resin, test its number average molecular weight and weight average molecular weight.
[0194] Dissolve this resin in N-...
Embodiment 2
[0196] Add 4.14 g of diamine compound (2), 10.02 g of 2,2-bis(4-aminophenyl)hexafluoropropane, and 90 g of N-methylpyrrolidone into the reaction vessel, stir and dissolve at 20°C. Add 3.43g of dianhydride compound (7) and 6.72g of cyclohexanetetracarboxylic dianhydride in sequence, polymerize for 24 hours, and test the rotational viscosity to reach 4.2×10 4 mPa / s, forming the precursor solution of transparent polyimide. Test its logarithmic viscosity.
[0197] Add 20.0 g of acetic anhydride and 10.1 g of triethylamine to this precursor solution, and carry out chemical imidization reaction for 2 h. After imidization is completed, a polyimide solution is obtained. This solution was slowly poured into ethanol. A white filamentary precipitate precipitated. The filamentous precipitate was filtered off and dried. Obtain transparent polyimide resin, test its number average molecular weight and weight average molecular weight.
[0198] Dissolve this resin in N-methylpyrrolidone ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Modulus | aaaaa | aaaaa |
| Rotational viscosity | aaaaa | aaaaa |
| Rotational viscosity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More 
PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.
