SU715596A1 - Electrorheological composition - Google Patents

Description

J. The invention relates to electrorheological compositions for liquid dielectric and hydraulic working media and can be used in electrostatic motors or in control devices. Known working medium for electrostatic machines til, containing in its composition, weight. %: Diatomite 0.5–10.0 Transformer / oil89.5–99.45 Diethylamine 0.05–0.5 The electrorheological effect of this composition, i.e., the relative increase in apparent viscosity depending on the strength of the applied eleatric field, is small and decreases with time When stored. Known another electrorheological composition containing silicon dioxide with a particle size (0.04-10 μm) in an amount of 10-15% by volume. WATER free quantity (activator) - 4 molecules / nm, surface-active substance In an amount sufficient to expand liquefaction, and 1O-55% by volume. mineral oil 2. The main disadvantage of this composition is the presence of surface activator, i.e., the amount of which must be maintained within predetermined narrow limits in the agents and activators of the activator. The process of introducing the activator onto the surface of solid particles is complex, time-consuming, difficult to reproduce, and deliberately leads to a non-equilibrium adsorption state of the entire system. The electrorheological composition is known, which includes finely dispersed titanium dioxide, hydrocarbon oil type mineral and vegetable oil in 1O-1OO times the weight quantity compared to 1 solids of the indicated pigment and surfactant from the group of highly polyny organic compounds, for example, carbolic acids or cnnjvta W; . ,, g ,,. „3.,., ....„ ... :: „, .. However, the known composition gives poor performance of erectrorheologists lecKHx properties, which are reduced in the process of exploitation. In addition to this, this composition is unstable and unstable; it has a relatively high epectrum and in. Avoiding overheating in the electrical field of the electric field is only a few short, rare voltage pulses. The purpose of the invention is to improve the electrical and rheological properties of the properties and the sedimentation stability of the electroplating composition. , .. .., ..., The goal is achieved by the fact that the electrorheological composition contains a mixture of vaseline oil and white mineral oil as a hydrocarbon liquid; taken in a volume ratio of {540): (), as a surfactant, the opeate is rnffiejpHHa and low molecular weight polyamide with these components, weight. h; Titanium dioxide80-100 Vaseline mixture. oils and white spirit-. 60-80 6 Glycerol oleate1-10 Low molecular weight polyamide 0.5-3 Improving the sedimentation stability of the proposed composition is achieved by BBefleHlfeM low molecular weight polyamide or low pressure polyethylene, which structure the compositions after their manufacture and prevent sedimentation of solid particles. The composition is prepared according to the usual paint and varnish technology with simultaneous mixing of all components, which ensures the adsorption equilibrium between the dispersed phase and the dispersion medium. In the following; The table shows specific examples of the composition proposed and the relative change in erq viscosity in an electric field with a voltage of 500 V / mm and a frequency of 300 TV. with a shear rate gradient of 8.1 s. The content of the components is related to 100 weight, including finely dispersed titanium dioxide.

Finely dispersed

titanium oxide100

100

.m-

Vaseline oil56 41 24 1O

White h; pyrite12

Glycerol oleate10

Low molecular weight

Oh, 5 polyamide 0,5

The relative increase in the Viscosity in the 4.7 electric field is 4.7 and the shear rate gradient 140 Measurement of the electrorheological e4 fctGa for cucTi-aea through the depth of force and through. 1.5 Years of storage, until then, what led to the increase in the amount of electricity in the electric field is fully preserved. 1-2 months. A wound of sbva is hiccuping a loose sediment occupying a large

100

100 13.6 25 50 5 48 10

0.5 /

Claims (3)

11.5 14.5 electric field electric field 1000 V / mm. part of the volume, which is easily mixed after 1.5 years of storage. The croneshaft found that for the Five Prepared lots, the electrorheological effect is fully reproducible. The specific volumetric electric conductivity of the composition, measured at a direct current, does not exceed () 10 Ω-cm. Thus, the proposed composition i compared to the existing ones5 has a high electrorheological effect, is stable in time during storage and operation, and can be widely used in various devices operating on the basis of the electrorheological effect. 10 The formula of the invention. 1, Electrorheological composition, finely dispersed titanium dioxide, hydrocarbon liquid and surfactant; characterized in that, in order to / improve electrorheological properties and sedimentation stability, it contains as a hydrocarbon liquid a mixture of vaseline oil and white spirit, as a surfactant, glycerol oleate and addi cl. low molecular weight polyamide with the following ratio of components,. including: Titanium dioxide 80-100 Mixture of vaseline oil and white spirit 60-80 Glycerin oleate 1-10 Low molecular weight polyamide 0.5-3. 2. Composition according to claim 1, characterized in that it contains a mixture of green oil and white spirit at the next volume ratio of compotes: Vaseline oil 5-40 White spirit 60-95 Sources of information that are taken into account during the examination 1. Author's certificate of the USSR 489699, cl. H 02 N 1/10, 09.09.73. 2. US patent number 3412031, 252-75, 19.11.68. 3. US patent number 3427247, 252-75, 11.02.69.