Process for obtaining low residual aramid materials

摘要

The present invention provides for a process for reducing the content of one or more residuals in aramid fibers or filaments, comprising, in this order, the steps of introducing the aramid fiber or filaments into a extraction solution adjusted to a pH ranging from of 2 to 7, adjusting the extraction solution and the aramid fibers or filaments to a temperature of to from 80° C. to 140° C., removing the aramid fibers or filaments from the extraction solution, introducing the aramid fiber or filaments into a first rinsing solution adjusted to a pH ranging from of 2 to 7, optionally comprising a detergent, adjusting the first rinsing solution and the aramid fibers and filaments to a temperature of from 70° C. to 100° C., removing the aramid fibers or filaments from the first rinsing solution.

主权项

1. A process for reducing the content of one or more residuals in aramid fibers or filaments, comprising, in this order, the steps of
a. introducing the aramid fibers or filaments into a extraction solution being free of any coloring ingredient and adjusted to a pH ranging of from 2 to 7, b. adjusting the extraction solution and the aramid fibers or filaments to a temperature of from 80° C. to 140° C. c. removing the aramid fibers or filaments from the extraction solution d. introducing the aramid fibers or filaments into a first rinsing solution adjusted to a pH ranging of from 2 to 7, e. optionally comprising a detergent, f. adjusting the first rinsing solution and the aramid fibers or filaments to a temperature of from 70° C. to 100° C., g. removing the aramid fibers or filaments from the first rinsing solution,
wherein the extraction solution is an aqueous solution comprising of from 0 to 40 g/l of a salt component and of from 0 to 40 g/l of a carrier component, andwherein the sum of the salt and carrier components is of from 20 g/l to 80 g/l; wherein the process provides aramid fibers or filaments having 0.01 to 0.2 weight percent orthodichlorobenzene; N-methyl-2-pyrrolidone(NMP); 1,3-Dimethyl-2-Imidazolidinone(DMI); or N,N-dimethylacetamide (DMAC).