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Preparation method for suspension

A suspension and solution technology, which is applied in the petroleum industry, additives, lubricating compositions, etc., can solve the problems of different effects, speed up the precipitation process, and difficulty in large-scale production, and achieve good practicability and simplify the preparation steps.

Inactive Publication Date: 2020-02-04
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] However, for the existing methods to alleviate the precipitation and compaction of suspensions, the preparation process of particles with special structures or shapes is generally cumbersome, and it is difficult to achieve large-scale production. process
As far as additives are concerned, the addition of additives tends to increase the viscosity of the fluid and reduce its performance
In addition, the same surfactant has different effects on different dispersed phase and continuous phase systems. The selection of surfactants should be determined according to the characteristics of the system, which requires long-term screening, and the use of additives will also increase the cost

Method used

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  • Preparation method for suspension
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preparation example Construction

[0055] The embodiment of the present invention relates to a suspension preparation method. In terms of the overall design idea, the preparation method mainly includes the following steps:

[0056] Step a: selecting the particles to be dispersed as the dispersed phase;

[0057] Step b: Select continuous phase A and continuous phase B of the liquid medium dispersant, wherein the wettability of continuous phase A and particles is greater than that of continuous phase B and particles, and the continuous phase A and continuous phase B are mutually soluble , and the density between them is similar;

[0058] Step c: mixing the continuous phase A and the continuous phase B until the two are miscible to obtain a compound liquid;

[0059] Step d: Disperse the particles in the compounding liquid to obtain a suspension.

[0060] Among them, the preparation method of this embodiment will be specifically described by using the suspension as the electrorheological fluid, but in addition to...

Embodiment 1

[0082] This example is for the preparation of (silicone oil+alkane)-based giant electrorheological fluid.

[0083] The dispersion media used in this embodiment are: 10cSt silicone oil (Silicone oil), dodecane (Dodecane), tetradecane (Tetradecane), hexadecane (Hexadecane), wherein the silicone oil is specifically dimethyl silicone oil. Table 1 is The contact angles between GER particles and the above four liquids measured by K100 mechanical surface tensiometer can be seen from Table 1 that the wetting of silicone oil to GER particles is better than that of alkanes, so it is selected as continuous phase A, and alkanes as continuous phase B .

[0084] Table 1. Relative contact angles of the continuous phase and GER particles

[0085] gamma d

gamma d

gamma Polarity contact angle Powder 8.1 68.8 76.9 Polar Silicone oil 18.5 0.7 19.2 Waek polarity 3.6° Dodecane 25.4 0 25.4 Non-polar 82.6° Tetradecane 26.5 0 26....

Embodiment 2

[0094] This example is to prepare (silicone oil+alkane derivative)-based giant electrorheological fluid.

[0095] In the preparation of giant electrorheological fluids, the liquid alkane derivatives that can be used include chlorododecane, phenyldodecane, 1-phenylheptane, 1-phenyloctane, 1-phenylnonane, 1 -Phenyl-n-decane, 1-phenylundecane, etc. As an example, the specific dispersion medium used in this embodiment is: 10 cSt silicone oil and dodecylbenzene, and the specific silicone oil is still dimethyl silicone oil.

[0096] Figure 16 It is the (ΔP)2-t relationship diagram measured by the JF99A powder contact angle measuring instrument based on the Washburn method, and the relative contact angles of GER particles with silicone oil and dodecylbenzene are shown in Table 2. It can be seen from Table 2 that the wetting of the silicone oil to the particles is better, so it is selected as the continuous phase A, and dodecylbenzene is used as the continuous phase B. The (silicon...

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Abstract

The invention provides a preparation method for a suspension. The method comprises the following steps: selecting particles to be dispersed as a dispersion phase, and selecting a continuous phase A and a continuous phase B of a liquid medium dispersant, wherein the wettability of the continuous phase A and the particles is greater than the wettability of the continuous phase B and the particles, the continuous phase A and the continuous phase B are mutually soluble, and the density of the continuous phase A is similar to the density of the continuous phase B; and mixing the continuous phase Aand the continuous phase B until the continuous phase A and the continuous phase B are mutually soluble to obtain a compound liquid, and dispersing the particles into the compound liquid to obtain thesuspension. According to the preparation method for the suspension, two liquids with different wettability are compounded to be used as a continuous phase, the liquid phase with poor wettability is added, so that the agglomeration of the particles can be alleviated, the sedimentation and compaction phenomena can be reduced, the sedimentation time of the particles in the suspension can be greatlyprolonged, and the precipitation and compaction of the suspension can be reduced.

Description

technical field [0001] The invention relates to the technical field of suspension preparation, in particular to a suspension preparation method capable of reducing the precipitation and hardening of suspended particles in the suspension. Background technique [0002] Solid particles are dispersed in liquid and cannot sink quickly due to Brownian motion. At this time, the mixture of solid dispersed phase and liquid is called suspension. Taking the electrorheological fluid (ERF) as an example, the electrorheological fluid is composed of an insulating liquid medium and dielectric particles dispersed in the insulating liquid medium. Due to the density mismatch between the two and the easy aggregation of micro-nano particles, the particles under the action of gravity It is easy to settle and harden, and the fluid has solid-liquid separation, which will seriously limit the practical application of electrorheological fluid. [0003] At present, the precipitation and hardening are ...

Claims

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Application Information

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IPC IPC(8): C10M161/00C10N40/16
CPCC10M161/00C10M2203/022C10M2203/06C10M2211/022C10M2215/102C10M2227/065C10M2229/041
Inventor 巫金波袁欣温维佳梁宇岱张萌颖薛厂时权
Owner SHANGHAI UNIV
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