Preparation method of lignin-based carbon fiber
A plain-based carbon fiber and lignin technology, applied in the field of low-cost carbon fiber preparation, can solve problems such as inability to mass-produce, unsolved lignin, etc., and achieve the effects of solving continuous production, good spinnability, and broad market prospects
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Embodiment 1
[0026] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration accuracy is 0.45 μm, and the filtration temperature is 50 ℃. Adjust the pH of the filtrate to 2 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is extruded through a twin-screw extruder equipped with a vacuum pump to remove volatile components and then granulated. The screw temperature is 100-240°C, and the vacuum degree of the vacuum pump is less than 20mbar to obtain lignin slices. Take 400g of purified lignin slices to remove volatile components and 100g of dried polyethylene terephthalate (intrinsic viscosity is 0.68dL / g, molecular weight distribution i...
Embodiment 2
[0028] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration accuracy is 0.14 μm, and the filtration temperature is 60 ℃. Adjust the pH of the filtrate to 3 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is passed through a twin-screw extruder equipped with a vacuum pump capable of vacuuming to remove volatile components and then granulated. The screw temperature is 100-230° C., and the vacuum degree of the vacuum pump is less than 20 mbar to obtain lignin slices. Take 400g of purified lignin chips from which volatile components have been removed and 200g of dried polypropylene (weight-average molecular weight 156,0...
Embodiment 3
[0030] A preparation method of lignin-based carbon fiber, the specific steps are: dissolving 600g of kraft lignin in 2.5L of NaOH solution with pH=12, and filtering with ceramic membrane filtration equipment, the filtration precision is 300KDa, and the filtration temperature is 70°C . Adjust the pH of the filtrate to 3 with sulfuric acid, and filter under pressure to obtain a lignin precipitate. The precipitate was repeatedly washed and filtered with deionized water to obtain neutral lignin. Vacuum drying at 80 °C for 24 h to obtain dry purified lignin. The lignin is removed volatile components through a twin-screw extruder equipped with a vacuum pump to realize vacuuming function and then granulated. The screw temperature is 100-220°C, and the vacuum degree of the vacuum pump is less than 20mbar to obtain lignin slices. Take 400g of purified lignin slices from which volatile components have been removed and 300g of dried polylactic acid, and melt-spin with a sheath-core mel...
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