Preparation method of self-repairing polyimine composite material with photo-thermal performance for additive manufacturing
A technology of self-healing and composite materials, which is applied in the field of preparation of self-healing polyimide composite materials, can solve the problems of complex operation and low mechanical strength of polyimide composite materials, and achieve simple preparation methods and stable light-induced self-healing. Effects of repair performance and excellent mechanical properties
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Embodiment 1
[0040] Synthesize graphene oxide first, add 3g graphite powder (28 micron) in 2L beaker, place in oil bath, stir at room temperature, add 360mL H 2 SO 4 and 40 mL of H 3 PO 4Add to the beaker in turn, slowly add 18g of potassium permanganate into the reaction solution (the temperature of the reaction solution does not exceed 35°C), then heat the reaction solution to 50°C, and stir for 12h. After the reaction is over, after the temperature of the reaction solution drops to room temperature, add 400g of ice, slowly add 10mL of 30% hydrogen peroxide after the ice dissolves, and finally add pure water to let it settle, then remove the supernatant, and transfer the precipitate to dialysis The membrane was placed in pure water, dialyzed to neutrality, the product was ultrasonically dispersed in a beaker for 5 hours, and centrifuged at 4000rpm for 30 minutes. The supernatant was graphene oxide (GO) uniformly dispersed in the aqueous solution. Dissolve 140 mg of graphene oxide in 1...
Embodiment 2
[0043] Dissolve 420 mg of graphene oxide in 160 mL of ethanol, ultrasonically disperse for 30 minutes, dissolve 39.8 g of terephthalaldehyde (TA) in the above solution, stir at 500 rpm, and heat to 45 ° C to obtain TA-GO-ethanol; 22.6mL of diethylenetriamine (DETA) and 8.96mL of triethylenetetramine (TATE) were dissolved in 15mL of ethanol, then added to TA-GO-ethanol, and reacted for 1min in a water bath at 45°C, and the reacted The solution (polyimine-GO-0.6) was poured into a silicone oil carton and placed in a ventilated place to dry. The dried product was pulverized with a pulverizer, and the powder was passed through an 80-mesh sieve to obtain a GO-reinforced polyimide composite material, that is, polyimine-GO-0.6.
[0044] Take 800mg of the above-prepared polyimide-GO-0.6, and use a hot press at 70°C and 9MPa to heat press for 10 minutes to obtain a GO-reinforced polyimide composite sample. The effective size of the tensile sample is It is 5mm×2mm×2mm. The actual leng...
Embodiment 3
[0046] Dissolve 700mg of graphene oxide in 160mL of ethanol, ultrasonically disperse for 30min, dissolve 39.8g of terephthalaldehyde (TA) in the above solution, stir at 500rpm, and heat to 45°C to obtain TA-GO-ethanol; 22.6mL of diethylenetriamine (DETA) and 8.96mL of triethylenetetramine (TATE) were dissolved in 15mL of ethanol, then added to TA-GO-ethanol, and reacted for 1min in a water bath at 45°C, and the reacted The solution (polyimine-GO-1) was poured into a silicone oil paper box and placed in a ventilated place to dry. The dried product was pulverized with a pulverizer, and the powder was passed through an 80-mesh sieve to obtain a GO-reinforced polyimide composite material, that is, polyimide-GO-1.
[0047] Take 800mg of the above-prepared polyimide-GO-1, and use a hot press at 70°C and 9MPa to heat press for 10 minutes to obtain a GO-reinforced polyimide composite sample. The effective size of the tensile sample is It is 5mm×2mm×2mm. The actual length of the stre...
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