摘要:
Magnetorheological formulations, processes for preparing the same and uses therefor, the formulations comprising: (a) an ionic liquid comprising anions and cations, and (b) dispersed magnetizable particles having a mean diameter of 0.1 to 500 μm; wherein the ionic liquid comprises one or more salts selected from the group consisting of 1-butyl-3-methyl-imidazolium methylsulfate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methyl-imidazolium thiocyanate, 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methyl-imidazolium acetate, 1-butyl-3-methylimidazolium acetate, 1-ethyl-3-methylpyridinium ethylsulfate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-hexyl-3-methylimidazolium hexafluorophosphate, methyltrioctylammonium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy)ethylsulfate and mixtures thereof.
摘要:
Methods comprising: providing a suspension comprising magnetizable particles; and delivering the suspension through a gap (3), wherein a magnetic field is applied in the gap, such that the suspension is sheared in the gap in the presence of the magnetic field to form a conditioned suspension; and devices for conditioning suspensions containing magnetizable particles, the device comprising a gap (3) through which the suspension containing magnetizable particles flows and in which a shear force is applied to the suspension containing magnetizable particles, wherein the device furthermore contains a magnet for generating a magnetic field in the gap (3).
摘要:
Magnetorheological formulations, processes for preparing the same and uses therefor, the formulations comprising: (a) an ionic liquid comprising anions and cations, and (b) dispersed magnetizable particles having a mean diameter of 0.1 to 500 μm; wherein the ionic liquid comprises one or more salts selected from the group consisting of 1-butyl-3-methyl-imidazolium methylsulfate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methyl-imidazolium thiocyanate, 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methyl-imidazolium acetate, 1-butyl-3-methylimidazolium acetate, 1-ethyl-3-methylpyridinium ethylsulfate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-hexyl-3-methylimidazolium hexafluorophosphate, methyltrioctylammonium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy)ethylsulfate and mixtures thereof.
摘要:
A method for characterizing magnetorheological fluids using a volume flow rate measurement. The volume flow of the magnetorheological fluid through a capillary is initially measured, with a constant weight force being applied onto the magnetorheological fluid. A magnetic field is then applied to the capillary, and the volume flow of the magnetorheological fluid through the capillary is measured with the magnetic field applied, with a second constant weight force being applied onto the magnetorheological fluid. A device for carrying out the method comprises a container for storing a magnetorheological fluid, wherein the container is connected on one side to a capillary through which the magnetorheological fluid can flow, and is closed on a different side by a movable piston, which presses the magnetorheological fluid through the capillary with a constant weight force, and means for generating a magnetic field are provided in the region of the capillary.
摘要:
The invention relates to a rheometer having a rotatable shaft (1) on which a rotor plate (2) is fastened, and having a measuring instrument (10) for measuring torques exerted on the rotor plate (2) by a substance (6) to be studied during rotation of the shaft (1), a first measurement gap (5) for holding the substance (6) to be studied being formed between a first side (3) of the rotor plate (2) and a first shear face (4) and a second measurement gap (9) for holding the substance (6) to be studied being formed between a second side (7) of the rotor plate (2), opposite the first side, and a second shear face (8). The rheometer contains a magnet for generating a magnetic field in the first and second measurement gaps (5, 9).
摘要:
The invention relates to a rheometer having a rotatable shaft (1) on which a rotor plate (2) is fastened, and having a measuring instrument (10) for measuring torques exerted on the rotor plate (2) by a substance (6) to be studied during rotation of the shaft (1), a first measurement gap (5) for holding the substance (6) to be studied being formed between a first side (3) of the rotor plate (2) and a first shear face (4) and a second measurement gap (9) for holding the substance (6) to be studied being formed between a second side (7) of the rotor plate (2), opposite the first side, and a second shear face (8). The rheometer contains a magnet for generating a magnetic field in the first and second measurement gaps (5, 9).
摘要:
The invention relates to a constant load shear cell and a method for constant loading of a magnetorheological fluid in a constant load shear cell. The constant load shear cell comprises a rotatable shaft (1), to which a rotor plate (2) is fixed. A first gap (5), for accommodating a magnetorheological fluid, is formed between a first side (3) of the rotor plate (2) and a first shear surface (4). A second gap (8), for accommodating the magnetorheological fluid, is formed between a second side (6) of the rotor plate (2) facing away from the first and a second shear surface (7). The constant load shear cell further comprises at least one magnet (9) for generating a magnetic field in the first and second gaps (5, 8).
摘要:
Thermoplastic molding compositions comprising A) from 10 to 99% by weight of at least one thermoplastic polyamide, B) from 0.01 to 30% by weight of at least one highly branched or hyperbranched polyetheramine, C) from 0 to 70% by weight of further added materials, where the total of the percentages by weight of components A) to C) is 100%; the use of polyetheramines for improving the flowability and/or thermal stability of polyamides; and to the use of the molding compositions for the production of fibers, of foils, or of moldings of any type, and also to the resultant fibers, foils, or moldings.
摘要:
The invention relates to thermoplastic molding compositions comprising the following components: A) at least one thermoplastic polyamide, B) at least one hyperbranched polyethyleneimine, C) at least one amorphous oxide and/or oxide hydrate of at least one metal or semimetal with a number-average diameter of the primary particles of from 0.5 to 20 nm. The invention further relates to the use of the components B) and C) mentioned, for improving the flowability and/or thermal stability of polyamides, to the use of the molding compositions for the production of fibers, of foils, and of moldings of any type, and also to the resultant fibers, foils, and moldings.
摘要:
Thermoplastic molding compositions comprising A) from 10 to 99% by weight of at least one thermoplastic polyamide, B) from 0.01 to 30% by weight of at least one highly branched or hyperbranched polyetheramine, C) from 0 to 70% by weight of further added materials, where the total of the percentages by weight of components A) to C) is 100%; the use of polyetheramines for improving the flowability and/or thermal stability of polyamides; and to the use of the molding compositions for the production of fibers, of foils, or of moldings of any type, and also to the resultant fibers, foils, or moldings.