Recycling method of broken para-aramid paper
A technology of para-aramid paper and para-aramid fiber, applied in pulp beating method, pulp beating/refining method, paper recycling, etc., can solve the problems of restricted reuse, waste of resources, fiber dissociation, etc. The effect of disintegration difficulty, reducing fiber cohesion, and increasing wettability
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Embodiment 1
[0040] The para-aramid broke paper produced in the production process is collected and torn into small pieces (the longest diagonal line is less than 5cm), and then added to the dispersant aqueous solution at a mass concentration of 3%, soaked and stirred; wherein, the dispersant used is polyoxygenated Ethylene (number-average molecular weight 300-400,000), the amount of dispersant is 2% of the broke paper mass, the soaking water temperature is 50°C, the stirring speed is 200r / min, and the soaking and stirring time is 1h, so that the broken paper can be fully infiltrated;
[0041] Add the stirred slurry into the cone mill for beating, adjust the rotation speed to 600r / min, and set the beating time to 1.5h to obtain para-aramid fiber;
[0042] Para-aramid fiber chopped fiber (length is 6mm, diameter is 10-20μm), para-aramid fiber nanofiber (length is 30-300μm, diameter is 10-100nm) and para-aramid pulp obtained by the above steps , according to the mass percentage ratio of 50%:...
Embodiment 2
[0045] The para-aramid broke paper produced in the production process is collected and torn into small pieces (the longest diagonal line is less than 5cm), and then added to the dispersant aqueous solution at a mass concentration of 2%, soaked and stirred; wherein, the dispersant used is carboxymethyl Base cellulose (degree of substitution ≥ 0.8, viscosity 800-1200mpa.s at 25°C), dispersant dosage is 2% of broken paper, soaking water temperature is 40°C, stirring speed is 200r / min, soaking and stirring time is 1h, and the Make the broke paper fully infiltrated;
[0046] Add the stirred pulp into a double-disc refiner for beating, adjust the speed to 600r / min, and set the beating time to 1.5h to obtain para-aramid pulp;
[0047] Para-aramid fiber chopped fiber (length is 6mm, diameter is 10-20μm), para-aramid fiber nanofiber (length is 30-300μm, diameter is 10-100nm) and para-aramid pulp obtained by the above steps , according to the mass percentage of 55%: 40%: 5% to mix pulp...
Embodiment 3
[0050] The para-aramid broke paper produced in the production process is collected and torn into small pieces (the longest diagonal line is less than 5cm), and then added to the dispersant aqueous solution at a mass concentration of 3%, soaked and stirred; wherein, the dispersant used is polyacrylic acid Sodium (number average molecular weight 500-5000), the dosage of dispersant is 1.5% of the broke paper mass, the soaking water temperature is 60°C, the stirring speed is 200r / min, and the soaking and stirring time is 1h, so that the broken paper can be fully infiltrated;
[0051] Add the stirred pulp into the trough refiner for beating, adjust the speed to 700r / min, and set the beating time to 1.5h to obtain para-aramid pulp;
[0052] Para-aramid fiber chopped fiber (length is 6mm, diameter is 10-20μm), para-aramid fiber nanofiber (length is 30-300μm, diameter is 10-100nm) and para-aramid pulp obtained by the above steps , according to the mass percentage ratio of 50%: 35%: 15...
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