Polyimide froth in situ filling honeycomb composite material
A composite material, polyimide technology, applied in the direction of coating, etc., to achieve the effect of outstanding compressive performance, good bonding and simple preparation process
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Embodiment 1
[0041] In a three-neck round bottom flask equipped with a stirrer, add 400 grams of 4,4'-ODA, 2400 grams of tetrahydrofuran and 800 grams of methanol in a mixed solvent, stir to dissolve all the solids, then add 620 grams of ODPA, and stir at 30 ° C After 12 hours, add 20 grams of carbon nanotubes, continue to stir for 3 to 5 hours, dry the solution at 70°C for 18 hours, and then grind it into powder, which is the polyimide foam precursor powder.
[0042] Use 80-mesh stainless steel screen to evenly fill 300 grams of the powder into the holes of a hexagonal quartz honeycomb with a side length of 10 mm and a size of 500 mm × 500 mm × 10 mm. A graphite plate is placed on the bottom of the honeycomb and covered on the honeycomb. Put a graphite plate into a high-temperature oven, heat at 140°C for 1 hour, 250°C for 1 hour, and 300°C for 1 hour, and then cool to obtain a carbon nanotube-modified polyimide foam-filled honeycomb composite material .
Embodiment 2
[0044] First, 300 grams of the polyimide foam precursor powder obtained in Example 1 was pre-foamed into microspheres at 140 ° C, and then the microspheres were evenly filled into a quartz honeycomb identical to that of Example 1, and the bottom pad of the honeycomb There is a graphite plate, and a graphite plate is covered on the honeycomb, and then put into a high-temperature oven, heated at 250°C for 1 hour, 300°C for 1 hour, and then cooled to obtain carbon nanotube modified polyimide foam Filled honeycomb composite.
Embodiment 3
[0046] In a three-neck round bottom flask equipped with a stirrer, add 200 grams of 4,4'-ODA, 1200 grams of tetrahydrofuran and 400 grams of methanol in a mixed solvent, stir to dissolve all the solids, then add 310 grams of ODPA, and stir at 30 ° C After 12 hours, the solution was dried at 70° C. for 18 hours and then ground into powder, and then 10 grams of carbon nanotubes were fully mixed with the obtained precursor powder to obtain a polyimide foam precursor powder. All the other are with embodiment 1.
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