Method for preparing straw regenerated cellulose fiber
A technology of regenerated cellulose and straw, which is applied to artificial filaments in cellulose solution, fiber treatment, fiber raw material treatment, etc., can solve the problems of environmental pollution, large consumption of copper and ammonia, etc., to improve the extraction rate and reduce Environmental harm, effect of quality improvement
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Embodiment 1
[0022] 1) Treat 500g of rice straw into 4-5cm segments and add them to the reactor, then add impregnated acid (20Wt.% sulfuric acid aqueous solution), hydrogen peroxide (20Wt.%) (the mass ratio of pickled acid to hydrogen peroxide is 1 : 1) Add the mixed aqueous solution (2000mL) into the reactor, adjust the reaction temperature to 60°C, react for 10min, take the straw out of the reactor, filter the straw taken out, remove the solution in the straw, use 2100mL of 5Wt.% The NaOH aqueous solution washes the straw three times, and after washing, it is naturally dried until the moisture content of the straw is less than 15Wt.%.
[0023] 2) Put the pretreated straw in step 1) into the reactor, add 2000mL of the mixed solution of sodium sulfite and NaOH (the total percentage of sodium sulfite and NaOH is 87Wt.%, and the solid mass ratio of sodium sulfite and NaOH is 2: 1), control the reaction temperature at 80°C, and react for 30 minutes to obtain a cellulose solution;
[0024] 3)...
Embodiment 2
[0027] 1) Treat 500g of rice straw and wheat straw (mixed in any ratio) into small pieces of 4-5cm and add them to the reactor, then add sulfuric acid (25Wt.%) and hydrogen peroxide (37.5Wt.%) (mass ratio of pickling to hydrogen peroxide is 1:1.5) aqueous solution (2500mL) into the reactor, adjust the reaction temperature at 90°C, react for 25min, take out the pretreated straw, filter the taken straw, remove the solution in the straw, and treat it with 2500ml of NaOH aqueous solution ( 25Wt.%) wash the straw three times, after washing, dry naturally until the moisture content of the straw is less than 15Wt.%;
[0028] 2) Put the pretreated straw in step 1) into the reactor, add 2000mL of the mixed solution of sodium sulfite and NaOH (the total percentage of sodium sulfite and NaOH is 85Wt.%, and the solid mass ratio of sodium sulfite and NaOH is 3: 1), the reaction temperature is 100°C, and the reaction is 60 minutes to obtain a cellulose solution;
[0029] 3) Add 800mL of th...
Embodiment 3
[0032] 1) Treat 500g of a mixture of rice straw, wheat straw and corn straw in any ratio, into small pieces of 4-5cm, then add it to the reactor, then add sulfuric acid (20Wt.%), hydrogen peroxide (40Wt.%) (acid dipping and hydrogen peroxide The aqueous solution (3000ml) with a mass ratio of 1:2) was added to the reactor, the reaction temperature was adjusted at 75°C, and the reaction was stirred for 20min. NaOH aqueous solution treatment (18Wt.%) washes the straw four times. After washing, dry it naturally until the moisture content of the straw is less than 15Wt.%.
[0033] 2) Add 2500mL of a mixed solution of sodium sulfite and NaOH (the total percentage of sodium sulfite and NaOH is 83Wt.%, the solid mass ratio of sodium sulfite to NaOH is 3:1), the reaction temperature is 90°C, and the reaction is 45min to obtain cellulose solution;
[0034] 3) Add 1000mL of thiourea, urea, and sodium hydroxide composite aqueous solution to the reactor in step 2) (the mass ratio of thioure...
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