Preparation method of soluble fluorinated polyimide and application of soluble fluorinated polyimide in NTO acid protection
A fluorinated polyimide, soluble technology, applied in the field of energetic materials, can solve problems such as potential safety hazards, achieve low production costs, improve shell acid corrosion problems, and be easy to manufacture
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Embodiment 1
[0038] The JEO formulation was compressed into a 97% pressed drug density pellet. Add 10 g of dehydrated PVDF into a glass bottle, then add 90 g (95 mL) of DMF solvent, keep stirring at 60° C. for 5 hours until completely dissolved to prepare a solution with a mass fraction of 10%. Spray the PVDF solution evenly on the surface of the grain, and dry it naturally at room temperature for 10 minutes to form a protective layer with a thickness of 0.15 mm. The appearance is as follows: figure 2 . After comparing the hydrogen ion release curve of the grain column with the bare grain column in pure deionized water, it was found that the hydrogen ion release rate was significantly slowed down, as shown in image 3 . Use the formula to fit and calculate:
[0039] y=Ae -x / (1 / h)sinT +y0
[0040] In the formula, y is the pH value of the coated grain in 500 mL of pure deionized water.
[0041] x is time in seconds.
[0042] A is the solubility parameter of the polymer material, the ...
Embodiment 2
[0048]The JEO formulation was compressed into a 97% pressed drug density pellet. Add 10 g of dehydrated P84 into a glass bottle, then add 90 g (95 mL) of DMF solvent, keep stirring at 60° C. for 5 hours until completely dissolved, and prepare a solution with a mass fraction of 10%. The P84 solution was evenly sprayed onto the surface of the powder column, and after 10 minutes of natural air drying at room temperature, a protective layer with a thickness of 0.16 mm was formed, and the appearance was as follows: figure 2 . After comparing the hydrogen ion release curve of the grain column with the bare grain column in pure deionized water, it was found that the hydrogen ion release rate was significantly slowed down, as shown in image 3 . Use the formula to fit and calculate:
[0049] y=Ae -x / (1 / h)sinT +y0
[0050] In the formula, y is the pH value of the coated grain in 500 mL of pure deionized water.
[0051] x is time in seconds.
[0052] A is the solubility paramete...
Embodiment 3
[0058] The JEO formulation was compressed into a 97% pressed drug density pellet. Add 10 g of PEI after dehydration into the glass bottle, then add 90 g (87 mL) of NMP solvent, keep stirring at 60° C. for 5 hours until completely dissolved. The PEI solution was evenly sprayed onto the surface of the powder column, and after 10 minutes of natural air drying at room temperature, a protective layer with a thickness of 0.13 mm was formed, and the appearance was as follows: figure 2 . After comparing the hydrogen ion release curve of the grain column with the bare grain column in pure deionized water, it was found that the hydrogen ion release rate was significantly slowed down, as shown in image 3 . Use the formula to fit and calculate:
[0059] y=Ae -x / (1 / h)sinT +y0
[0060] In the formula, y is the pH value of the coated grain in 500 mL of pure deionized water.
[0061] x is time in seconds.
[0062] A is the solubility parameter of the polymer material, the unit is (J / ...
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