A kind of preparation method of conductive polyamide-imide composite material
A polyamide-imide, composite material technology, applied in the manufacture of conductive/antistatic filaments, one-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problem of difficult dispersion of carbon nanotubes
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Embodiment 1
[0034] The structural formula of the selected polyamide-imide resin (PAI-AU) is as follows:
[0035]
[0036] (1) Acidification treatment of carbon nanotubes: add 5g of multi-walled carbon nanotubes into a solution of strong oxidizing mixed acid (50ml of concentrated sulfuric acid and 50ml of concentrated nitric acid), heat to 115°C in a three-necked flask with mechanical stirring, and mechanically Stirred and refluxed for 1.5h. Cool to room temperature after the reaction, perform suction filtration, and wash with deionized water until neutral to obtain acidified carbon nanotubes.
[0037] (2) Preparation of conductive masterbatch: add 2g acidified carbon nanotubes and 8g polyamideimide to 100mL of N-methylpyrrolidone (NMP), then add phosphonylating reagent and solubilizer, under an inert atmosphere, heat up to 120°C, react for 4 hours. The reaction product was treated by ethanol or methanol precipitation, and then soaked with warm water several times, and the obtained pr...
Embodiment 2
[0041] The difference between this embodiment and Example 1 is that in the preparation step of conductive polyamide-imide material, 50 mg of conductive masterbatch was added to 49.55 mL of pre-prepared polyamide-imide / m-cresol solution (0.1 g / mL ), other processing means are consistent with embodiment 1. The conductivity of the polyamide-imide conductive film is 3.4×10 -5 S / m, the tensile strength is 54.0MPa, and the Young's modulus is 0.98GPa.
Embodiment 3
[0043] The polyamide-imide resin selected in the present embodiment and the acidification treatment process of carbon nanotube are consistent with embodiment 1, and difference is that step (2) and (3) treatment process are different, are described in detail as follows:
[0044] (2) Preparation of conductive masterbatch: Add 1g of acidified carbon nanotubes and 0.25g of polyamideimide into 100mL of N-methylpyrrolidone (NMP), then add phosphonylation reagent and solubilizer, and heat up under an inert atmosphere To 120°C, react for 4 hours. The reaction product was treated by ethanol or methanol precipitation, and then soaked with warm water several times, and the obtained product was vacuum-dried at 80° C. for 8 hours.
[0045] (3) Preparation of conductive polyamide-imide composites
[0046] Add 1g of conductive masterbatch to 38mL of pre-prepared polyamideimide / m-cresol solution (0.1g / mL), high-speed emulsification and ultrasonic vibration, and evenly disperse the carbon nan...
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