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Electrorheological fluid of attapulgite and titanium oxygen compound composite material

A technology of composite materials and electrorheological fluids, applied in the direction of lubricating compositions, petroleum industry, additives, etc., can solve problems affecting electrorheological properties, wide size distribution, irregular shape, etc., and achieve short preparation cycle and large yield stress , The effect of low leakage current density

Active Publication Date: 2011-02-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of material is mostly prepared by sol-gel method and co-precipitation method. The shape of the obtained product is irregular, the size distribution is wide and the agglomeration is serious, which affects its electrorheological properties.

Method used

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  • Electrorheological fluid of attapulgite and titanium oxygen compound composite material
  • Electrorheological fluid of attapulgite and titanium oxygen compound composite material
  • Electrorheological fluid of attapulgite and titanium oxygen compound composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The attapulgite clay with a purity of 98% was crushed and sieved to form an attapulgite clay powder. The attapulgite clay powder had a diameter of 20nm to 30nm and a length of 60nm to 200nm as observed by a scanning electron microscope.

[0039] Add 0.05 g of the above-mentioned attapulgite clay powder into a 100 ml water / ethanol mixed solution with a volume ratio of water and ethanol of 1:2, stir evenly, and adjust the pH value of the solution to 5 with dilute hydrochloric acid; obtain a suspension a. Dissolve 0.04mol oxalic acid in 100ml of water / ethanol mixed solvent with a volume ratio of 1:1, then add 0.02mol tetrabutyl titanate dropwise, and stir while adding until a transparent solution b is formed; keep stirring , add suspension a to solution b dropwise, and gradually form a milky white precipitate. After the reaction is complete, age the formed precipitate at room temperature for 5 hours; wash and centrifuge the aged precipitate, and place the obtained product i...

Embodiment 2

[0042] Weigh 1.5 g of the attapulgite and titanyl compound composite material prepared in Example 1, and mix evenly with 30 mL of dimethyl silicone oil (viscosity of 50 cst) to obtain the attapulgite and titanyl compound composite material electrorheological fluid, electrorheological fluid The mass percent concentration of the attapulgite and titanyl compound composite material is 5%.

[0043] Take 5mL of the above-mentioned attapulgite and titanium oxide compound composite electrorheological fluid, put it into a graduated cylinder, let it stand, and measure the suspension stability of the electrorheological fluid by direct observation, such as figure 2 shown. From figure 2 It can be seen that compared with the titanyl compound electrorheological fluid prepared in Comparative Example 2, the suspension stability of the attapulgite and titanyl compound composite electrorheological fluid prepared in Example 2 is significantly improved; especially after long-term storage (30 d...

Embodiment 3

[0045] The attapulgite clay with a purity of 88% was selected to be pulverized and sieved to form attapulgite clay powder. It was observed by scanning electron microscope that the attapulgite clay powder had a diameter of 40nm-50nm and a length of 400nm-600nm.

[0046] Dissolve 0.01mol of anhydrous calcium chloride in a mixed solution of 100ml of water / ethanol containing 0.015mol of citric acid, water and ethanol volume ratio of 1:9, then add 0.02g of the above-mentioned attapulgite clay powder, stir well, and use Adjust the pH value of the solution to 6 with dilute ammonia water to obtain a suspension a. Dissolve 0.02mol oxalic acid in 100ml water / ethanol mixed solvent with a volume ratio of water and ethanol of 1:1, then add 0.01mol tetrabutyl titanate dropwise, and stir while adding dropwise until a transparent solution b is formed; keep stirring , add suspension a to solution b dropwise, and gradually form a milky white precipitate. After the reaction is complete, age the ...

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Abstract

The invention discloses an electrorheological fluid of an attapulgite and titanium oxygen compound composite material. The electrorheological fluid comprises a continuous phase and a dispersed phase dispersed in the continuous phase, wherein the continuous phase is a liquid insulating medium; the dispersed phase is the attapulgite and titanium oxygen compound composite material; the diameter of the attapulgite is between 10 and 70 nm; the length is between 60 nm and 2 mu m; and the mass concentration of the dispersed phase in the electrorheological fluid is between 5 and 75 percent. Compared with the electrorheological fluid of titanium oxygen particles, the electrorheological fluid of the attapulgite and titanium oxygen compound composite material of the invention has the advantages of high yield stress, low leakage current density, high suspension stability and the like; the cost of raw materials is low; the process is simple; and the preparation period is short.

Description

technical field [0001] The invention relates to the field of electrorheological fluid, in particular to an electrorheological fluid composed of attapulgite and titanium oxide compound. Background technique [0002] Electrorheological fluid is a complex colloidal system formed by mixing semiconductor dielectric particles (dispersed phase) from nanometer to micron scale and insulating liquid (dispersion medium or continuous phase). When no external electric field is applied, the electrorheological fluid presents the mechanical properties of Newtonian fluid. Under the action of an external electric field, the dielectric particles are rapidly chained, and the equivalent viscosity increases significantly and even turns into a solid-like fluid, showing the behavior of a non-Newtonian fluid. mechanical properties. Due to its prominent feature of adjustable performance, electrorheological fluid shows greater advantages in mechatronics and automatic control than the existing technol...

Claims

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Application Information

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IPC IPC(8): C10M177/00C10M141/12C10M171/00C10N40/14C10M125/30
Inventor 程昱川郭建军刘雪辉刘丰华吴敬华宋振阳许高杰崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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