29-06-2017 дата публикации
Номер: US20170183460A1
Принадлежит:
A method for welding aramid fibers, wherein a) at least one area of an aramid fiber is treated with an ionic liquid so that the aramid is partially dissolved, b) the aramid fiber is contacted via the dissolved area with another aramid fiber area with pressure being applied to the contact area, and subsequently c) the partially dissolved area of the aramid is re-coagulated. 1. A method for welding aramid fibers comprising: i) α value <0.6 and β value >0.8;', 'ii) difference of β value minus α value >0.45,', 'wherein the α value and β value are Kamlet-Taft solvent parameters,, 'a) treating at least one area of an aramid fiber with an ionic liquid so that the aramid is partially dissolved, wherein the ionic liquid meets at least one of the following two criteriab) contacting the aramid fiber via the dissolved area with another aramid fiber area, and subsequentlyc) causing or allowing the partially dissolved area of the aramid to become re-coagulated.2. The method according to claim 1 , wherein the aramid fibers are selected from the group comprising meta-aramid und para-aramid copolymers.3. The method according to claim 2 , wherein the ionic liquid comprises a salt claim 2 ,wherein the salt cation is selected from a quaternary ammonium, phosphonium, guanidinium, pyridinium, pyrimidinium, pyridazinium, pyrazinium, piperidinium, morpholinium, piperazinium, pyrrolium, pyrrolidinium, oxazolium, thiazolium, triazinium, imidazolium, triazolium, protonated guanidinium, halide, selected from the group comprising F—, Cl—, Br—', {'br': None, 'i': 'n', '[R-COO]—\u2003\u2003(Vd)'}, 'carboxylate of the general formula'}], 'and the salt anion is selected from'} carbonate,', {'br': None, 'i': 's', '[R-OCOO]—\u2003\u2003(Vf)'}, 'alkylcarbonate of the general formula'}], 'wherein Rn represents hydrogen, (C1-10)alkyl, (C3-10)cycloalkyl, (C2-10)alkenyl, (C3 10)cycloalkenyl, aryl, or heteroaryl, preferably (C1-8)alkyl, (C3-8)cycloalkyl, (C2-8)alkenyl, (C3-8)cycloalkenyl, 5- to 6-membered ...
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