A kind of preparation method of flexible transparent conductive film and obtained product
A technology of transparent conductive film and transparent film, applied in fabric surface trimming, heating/cooling fabrics, textiles and papermaking, etc., can solve the problems of poisonous, expensive, unfavorable large-scale production, etc., achieve wide sources, low cost, suitable for large-scale The effect of mass production
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Embodiment 1
[0037] Example 1: Using silk as raw material to prepare silk nanofiber membrane by single-needle electrospinning technology
[0038] Firstly, silkworm cocoons were boiled in 0.5wt% sodium bicarbonate aqueous solution for 30 minutes to remove sericin, then the degummed silk fibroin fibers were washed three times with deionized water, and after the silk fibroin fibers were thoroughly dried, Put 2 grams of silk fibroin fiber into 8 ml of 9.3 mol / liter lithium bromide salt solution system and dissolve it at 70°C for 4 hours, then dialyze it in deionized water for three days to obtain silk fibroin aqueous solution, and then freeze-dry it to obtain silk fibroin fiber. Protein sponge.
[0039] The obtained silk fibroin sponge is dissolved in 98-100% anhydrous formic acid to obtain a 15wt% silk fibroin formic acid solution. Then use the single-needle electrospinning technology, the working voltage is 20KV, the working distance is 20cm, the injection speed of silk fibroin formic acid ...
Embodiment 2
[0041] Example 2: Electrospinning technology to prepare nanofiber membranes of different thicknesses
[0042] By controlling the electrospinning deposition time, the thickness and transparency of the obtained nanofibrous film can be controlled.
[0043] Using the silk fibroin formic acid solution prepared in Example 1, the electrospinning working voltage was 20 kV, the working distance was 20 cm, and the injection speed of the silk fibroin formic acid solution was 0.5 ml / hour, and electrospinning was performed for 60 seconds, 90 seconds, and 120 seconds respectively. Second. Other operations are the same as in Example 1. Obtain the silk nanofiber membrane of the transparency of different thickness, the transparency of the electrospun silk nanofiber membrane of different thickness is different (see attached image 3 ). The longer the time of electrospinning, the lower the transparency. For the flexible transparent film of nanofibers with a light transmittance of 90% at a wav...
Embodiment 3
[0045] Embodiment 3: the preparation method of the flexible transparent conductive film based on silk fibroin material
[0046] Under the electrospinning conditions described in Example 1 and Example 2, high temperature-resistant metal copper foil was selected as the receiving substrate, and nanofiber films of different thicknesses could be obtained by electrospinning silk nanofiber deposition at different times.
[0047] The silk nanofiber membranes with an electrospinning time of 30 seconds to 120 seconds were subjected to high-temperature heat treatment at 800° C. for 1 hour in an inert atmosphere of argon:hydrogen = 10:1 to obtain conductive silk nanofiber membranes maintaining the original nanofiber structure. Among them, the silk fibroin polypeptide chain structure is transformed into a graphite microcrystalline carbon structure during high temperature treatment, and its transmission electron microscope picture is shown in the attached Figure 5 .
[0048] Put the carbo...
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