Method for preparing silk protein composite cellulose fibers
A technology of composite cellulose and silk protein, applied in the direction of artificial filament made of viscose, can solve the problems of low silk yield, low utilization value, and high price, and achieve improved recycling value, fast dissolution speed, and degradation little effect
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Embodiment 1
[0027] After cutting the waste silk, add 1.0wt% NaHCO 3 Dissolve and soak, heat to 80°C for 30 minutes, take it out and dry it. The dried silk was added to a 10mol / L LiBr solution and dissolved at 55°C for 5 hours to prepare a 13wt% silk protein solution. After cooling the prepared silk protein solution to normal temperature, use a filter screen with a pore size of 20um to remove impurities therein, and dialyze the filtered silk protein solution with a polyethylene glycol solution with a molecular weight of 8000 and a concentration of 15wt%. , the molecular weight cut-off of the dialysis membrane is 3000, the number of dialysis is 3, and the total dialysis is 20 hours.
[0028] The dialyzed silk protein solution is mixed with the cellulose fiber solution, and the blended solution of silk protein and cellulose is obtained through thorough mixing, dissolution, filtration, and defoaming, and the amount of silk protein added is calculated as silk protein , which is 8wt% of cellu...
Embodiment 2
[0030] After cutting the waste silk, add 0.5wt% Na 2 CO 3 Dissolve and soak, heat to 90°C for 40 minutes, take it out and dry it. The dried silk was added to 9mol / L LiBr solution, and dissolved at 60°C for 4 hours to prepare a 7wt% silk protein solution. After cooling the prepared silk protein solution to normal temperature, filter it with a filter screen with a pore size of 15um to remove impurities therein.
[0031] Mix the filtered fibroin solution with the cellulose fiber solution, and through thorough mixing, dissolution, filtration, and defoaming, a blended solution of fibroin and cellulose is obtained, and the amount of the fibroin added is calculated as silk protein , which is 25wt% of cellulose, the blended solution is spun in a coagulation bath containing 135g / L of sulfuric acid, 10g / L of zinc sulfate, and 335g / L of sodium sulfate at a temperature of 53°C, and then washed with water, desulfurized, and oiled and drying to obtain silk protein composite cellulose fib...
Embodiment 3
[0033] After cutting the waste silk, add 2.5wt% NaHCO 3 Dissolve and soak, heat to 75°C for 50 minutes, take it out and dry it. Add the dried silk into 7mol / L LiBr solution, and dissolve it at 70°C for 3 hours to prepare a 10wt% silk protein solution. After cooling the prepared silk protein solution to normal temperature, filter it with a filter screen with a pore size of 25um to remove impurities therein, and dialyze the filtered silk protein solution with a polyethylene glycol solution with a molecular weight of 9000 and a concentration of 13wt%. , the molecular weight cut-off of the dialysis membrane is 4000, the number of dialysis is 2, and the total dialysis is 32 hours.
[0034] The dialyzed silk protein solution is mixed with the cellulose fiber solution, and the blended solution of silk protein and cellulose is obtained through thorough mixing, dissolution, filtration, and defoaming, and the amount of silk protein added is calculated as silk protein , which is 35wt% of...
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