A kind of soft polyimide foam, its preparation method and its application
A technology of polyimide and polyimide precursor, applied in the field of polyimide, can solve the problems of uneven foam density, poor uniformity, holes, etc., and achieve the effect of uniform density and pore size, and uniform pore size
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Embodiment 1
[0066] 1) Add 40 parts of BTDA, 50 parts of low-boiling point solvent absolute ethanol, and 45 parts of low-boiling point solvent tetrahydrofuran into a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 3 hours under stirring to obtain Homogeneous solution of diesters of aromatic diacids.
[0067] 2) Add 40 parts of 4,4'-ODA to the homogeneous solution obtained in step 1), and add 0.1 part of imidization accelerator isoquinoline, and 1.5 parts of polyethylene glycol 600, under the condition of nitrogen protection Under stirring and reflux for 20 minutes to carry out polycondensation reaction, a homogeneous solution was obtained.
[0068] 3) 0.5 parts of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 20 minutes under nitrogen protection to obtain a polyimide precursor resin solution.
[0069] 4) The polyimide precursor resin solution in step 3) was rotary evapor...
Embodiment 2
[0092] 1) Add 80 parts of BTDA, 60 parts of low-boiling point solvent absolute ethanol, and 50 parts of low-boiling point solvent tetrahydrofuran into a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 3 hours under stirring to obtain Homogeneous solution of aromatic diacid diester.
[0093] 2) Add 80 parts of 4,4'-ODA to the homogeneous solution obtained in step 1), and add 0.5 parts of imidization accelerator isoquinoline, and 3 parts of polyethylene glycol 600, under the condition of nitrogen protection Under stirring and reflux for 20 minutes to carry out polycondensation reaction, a homogeneous solution was obtained.
[0094] 3) 1 part of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 30 minutes under nitrogen protection to obtain a polyimide precursor resin solution.
[0095] 4) The polyimide precursor resin solution in step 3) was rotary evaporated at 6...
Embodiment 3
[0101] 1) Add 40 parts of ODPA, 60 parts of low boiling point solvent absolute ethanol, and 30 parts of low boiling point solvent tetrahydrofuran in a there-necked flask equipped with a mechanical stirrer, a spherical condenser and a thermometer, and heat and reflux for 4 hours under stirring to obtain Homogeneous solution of diesters of aromatic diacids.
[0102] 2) Add 40 parts of 3,4'-ODA to the homogeneous solution obtained in step 1), add 0.1 part of imidization accelerator isoquinoline, and 1 part of silicone oil, and stir and reflux for 40 minutes under nitrogen protection. Polycondensation reaction to obtain a homogeneous solution.
[0103] 3) 0.1 part of polyoxyethylene ether nonionic fluorocarbon surfactant FSO-100 was stirred and refluxed for 40 minutes under nitrogen protection to obtain a polyimide precursor resin solution.
[0104] 4) Rotate the polyimide precursor resin solution in step 3) to a viscous state at 60°C and pour it into a porcelain dish, then cov...
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