Highly-acid-resistant modified aramid fiber and preparation method thereof
A technology of modifying aramid fiber and aramid fiber, which is applied in the field of aramid fiber
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[0030] The present invention provides a kind of preparation method of strong acid-resistant modified aramid fiber described in the above technical scheme, comprising the following steps:
[0031] a) Disperse the aramid fiber in an organic solvent, add a modifying agent, react under stirring conditions, rotary steam, and dry to obtain a modified aramid fiber with strong acid resistance;
[0032] or b) impregnating the aramid fiber and modifier, washing with water, and rotary steaming to obtain a pre-modified aramid fiber; then dispersing the pre-modified aramid fiber in an organic solvent, adding a modifier again, and reacting under stirring conditions, Rotary steaming and drying again to obtain a modified aramid fiber with strong acid resistance;
[0033] or c) in the later stage of aramid polycondensation, adding a modifier until the rubber particles are formed, forming fibers, washing with water, rotary steaming, and drying to obtain a modified aramid fiber with strong acid ...
Embodiment 1
[0053] Under the protection of nitrogen, add 100mL of solvent N-methylpyrrolidone, which has been treated with water removal, into the reactor, add 26g of solubilizing salt CaCl and 4g of surfactant octadecyl salt cationic alkyl imidazoline under stirring, and heat Dissolve the solubilizing salt and surfactant at 90°C to obtain a solution of the solubilizing salt and surfactant. The heating time is 60 minutes, and then cool in a cold water bath for about 10 minutes to 5°C. Add 4.326g of p-phenylenediamine to the reaction vessel. After the p-phenylenediamine is dissolved, cool the reaction vessel to -5°C, then add terephthaloyl chloride, increase the stirring speed to 2000rpm, continue the reaction for 8 minutes, the reaction temperature is -5°C, and stop when the above reaction system appears gel phenomenon Stir to obtain jelly;
[0054] Add 1L of dispersant N-methylpyrrolidone to the above-mentioned jelly body to swell the jelly body, stir the swollen jelly body into a homoge...
Embodiment 2
[0061] Use Tris-HCl to make a buffer solution of water with pH=8.5, add dopamine hydrochloride to obtain a dopamine (DA) solution with a dopamine concentration of 2g / L, soak 100ml solution and 1g aramid pulp for 2h, wash with water and filter, To obtain the dopamine-modified PPTA, most of the water was removed by rotary evaporation and solvent removal. Then disperse the product in the organic solvent tetrahydrofuran, add Si-69 to it according to the mass ratio of Si-69:dopamine-modified PPTA=1:1, then stir and mix for uniform reaction for 2h, and remove it by rotary steaming Most of the solvents were dried in a vacuum oven at 60°C to constant weight to obtain a coupling agent and modified aramid fiber.
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