Conductive containers used in polyimide purification, electronic grade polyimide products
A polyimide, electronic-grade technology, applied in the field of thin-film materials, can solve the problems of insufficient purity of polyimide materials, and achieve the effect of improving the purification effect and reducing the content of free metal ions
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[0040] The embodiment of the present invention also provides a kind of preparation method of electronic grade polyimide product, described method comprises the following steps:
[0041] 1. Prepare polyamic acid precursor solution or polyimide solution.
[0042] 2. Place the polyamic acid precursor solution or polyimide solution in figure 1 in the conductive container shown.
[0043] 3. The conductive container is energized so that the polyamic acid precursor solution or polyimide solution moves in the conductive container to obtain an electronic grade polyamic acid precursor solution or polyimide solution.
[0044] 4. Using the electronic grade polyamic acid precursor solution or polyimide solution to prepare the polyimide product.
[0045] When the conductive container is energized, the treatment efficiency of the polyamic acid precursor solution or the polyimide solution is 0.1-10L / 6h.
[0046] Preferably, when the conductive container is energized, the treatment efficien...
Embodiment 1
[0050] 1.1. Weigh 5g of sodium carboxymethylcellulose (CMC) into a conical flask, slowly add 1000ml of boiling water into the conical flask and keep stirring with a glass rod until most of the CMC is dissolved. Then put it in a constant temperature water bath at 60-70°C for 2-3 hours, stirring continuously until the CMC in the aqueous solution is completely dissolved.
[0051] 1.2. Weigh 330g of silica gel adsorbent (adsorbent: aqueous solution = 1:3), slowly add it to the aqueous solution, use mechanical stirring at 100-300rpm to stir for 1h, and place it in an ultrasonic instrument for 1-6h until the solution has no bubbles.
[0052] 1.3. Use an automatic coating machine to coat the solution with a thickness of 20 μm on the ITO conductive glass (length 50 cm, width 40 cm, thickness 0.1 mm).
[0053] 1.4. Dry overnight, and then dry in an oven at 110°C for 0.5h to obtain ITO conductive glass coated with adsorbent.
[0054] 1.5. After preparing the conductive glass, put the s...
Embodiment 2-8
[0056] Examples 2-8 adopted the same method and steps as in Example 1 to prepare purified polyimide solutions respectively.
[0057] The difference from Example 1 is that in Examples 2-8, the thickness of the conductive glass, the selected adsorbent, the coating thickness of the adsorbent, and the treatment efficiency of the applied electric field of the conductive glass are all different. The specific data are shown in Table 1 .
[0058] Table 1
[0059]
[0060] The purified polyimide solution obtained in Examples 1-8 was used to detect the content of metal ions by ICP-MS to verify the purification effect.
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