Polyimide paper honeycomb core and preparation method thereof
A technology of polyimide paper and polyimide glue, applied in special paper, paper, papermaking and other directions, can solve the problems of high temperature resistance, low hygroscopicity, poor water resistance, and low use temperature, and achieve low hygroscopicity, High decomposition temperature, the effect of increasing strength
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Embodiment 1
[0033] A polyimide paper honeycomb core with a space side length of 1.83 mm was prepared. Specific steps are as follows:
[0034] (1) Use polyimide paper with a thickness of 0.05 mm as the raw material. Glue is applied with a glue roller dipped in core strip glue, and then the polyimide paper after multi-layer glue coating is stacked in staggered layers, and finally hot pressed by a hot press to make a honeycomb stack. The core strip glue is polyimide glue, which is polymerized by phthalic anhydride and m-phenylenediamine, with a viscosity of 30s / 50ml. When hot pressing, first preheat at 80°C for 50 minutes, then gel at 130°C for 100 minutes, and finally cure at 250°C for 4 hours, and the hot pressing pressure is 6MPa.
[0035] (2) The honeycomb block is stretched with a stretching machine at a stretching speed of 10mm / min to form regular hexagonal honeycomb cells, and then set in an oven at 300°C for 40min. Made of white honeycomb blocks.
[0036] (3) Dip and solidify the...
Embodiment 2
[0041] A polyimide paper honeycomb core with a space side length of 3.67 mm was prepared. Specific steps are as follows:
[0042] (1) Use polyimide paper with a thickness of 0.08mm as the raw material. Glue is applied with a glue roller dipped in core strip glue, and then the polyimide paper after multi-layer glue coating is stacked in staggered layers, and finally hot pressed by a hot press to make a honeycomb stack. The core strip glue is polyimide glue, which is polymerized by phthalic anhydride and m-phenylenediamine, with a viscosity of 25s / 50ml. When hot pressing, first preheat at 90°C for 40 minutes, then gel at 120°C for 120 minutes, and finally cure at 160°C for 5 hours, and the hot pressing pressure is 5MPa.
[0043] (2) Stretch the honeycomb block with a stretching machine at a stretching speed of 5-20mm / min to form a regular hexagonal honeycomb cell, and then set it in an oven at 300°C for 60min. Made of white honeycomb blocks.
[0044] (3) Dip and solidify the...
Embodiment 3
[0049] A polyimide paper honeycomb core with a space side length of 2.75 mm was prepared. Specific steps are as follows:
[0050] (1) Use polyimide paper with a thickness of 0.13mm as the raw material. Glue is applied with a glue roller dipped in core strip glue, and then the polyimide paper after multi-layer glue coating is laminated in a staggered layer, and finally hot pressed by a hot press to make a honeycomb stack. The core strip glue is polyimide glue, which is polymerized from diphenyl ether dianhydride and m-phenylenediamine, with a viscosity of 35s / 50ml. When hot pressing, first preheat at 70°C for 50 minutes, then gel at 140°C for 90 minutes, and finally cure at 250°C for 3 hours, and the hot pressing pressure is 7MPa.
[0051] (2) Stretch the honeycomb block with a stretching machine at a stretching speed of 10-15mm / min to form a regular hexagonal honeycomb cell, and then set it in an oven at 310°C for 80min. Made of white honeycomb blocks.
[0052] (3) Dipping...
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