Silicon dioxide- aqueous polyurethane nano composite electrorheological fluid preparation method

A nano-composite, water-based polyurethane technology, used in lubricating compositions, petroleum industry, base materials, etc., to achieve the effects of not easy to settle, low leakage current density, and avoiding mutual entanglement

Inactive Publication Date: 2007-08-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research on the application of water-based polyurethane is mainly concentrated in adhesives and coatings. As for the performance of the electro-rheological fluid of water-based polyurethane, the preparation method of the electro-rheological fluid is rarely reported.

Method used

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  • Silicon dioxide- aqueous polyurethane nano composite electrorheological fluid preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] [Example 1] The content of ethyl orthosilicate is 35% (calculation formula is: percentage content of ethyl orthosilicate = ethyl orthosilicate mass / PU mass × 100%, the same below)

[0016] (1) Preparation of anionic polyurethane prepolymer:

[0017] In a three-necked flask equipped with a condensing device and an electric stirrer, the molar ratio is n NCO / n OH =1.5:1 Add polyester polyol, 4,4'-diphenylmethane diisocyanate (MDI) or hexamethylene diisocyanate (HDI), and 5-10ml of solvent ethyl acetate; heat up to 70 ~80℃, constant temperature reaction for 1.8~2 hours; at 75℃, the molar ratio is n COOH / n OH =3:1 Add chain extender dimethylolpropionic acid (DMPA), react for 0.8-1 hour; cool down to 45-50°C, add about 2.4 grams of isopropanol to block, and keep reacting for half an hour.

[0018] (2) Preparation of silica-waterborne polyurethane nanocomposite dispersion:

[0019] Take 41.42 grams of prepolymer and raise the temperature to 60°C, add 14.50 grams of te...

Embodiment 2

[0022] [Example 2] Tetraethyl orthosilicate content is 45%

[0023] (1) Preparation of anionic polyurethane prepolymer: same as Example 1.

[0024] (2) Preparation of silica-waterborne polyurethane nanocomposite dispersion:

[0025] Take 41.42 grams of prepolymer and raise the temperature to 60°C, add 18.64 grams of tetraethyl orthosilicate to react for half an hour, cool down to 40°C, add a certain amount of neutralizing agent triethylamine and react with carboxyl group for 15 minutes to form a salt. 147.21 ml of water were added and the solvent was distilled off. The silicon dioxide-anionic polyurethane aqueous dispersion with a solid content of 30% can be obtained.

[0026] (3) Electrorheological fluid for preparing silica-waterborne polyurethane nanocomposite:

[0027] Get the prepared silicon dioxide-anionic polyurethane aqueous dispersion and put it in a refrigerator to freeze into ice, and then put it on a freeze drier to dry for 24 hours. Grinding the dried compoun...

Embodiment 3

[0028] [Example 3] Tetraethyl orthosilicate content is 55%

[0029] (1) Preparation of anionic polyurethane prepolymer: same as Example 1.

[0030] (2) Preparation of silica-waterborne polyurethane nanocomposite dispersion:

[0031] Take 41.42 grams of prepolymer and raise the temperature to 60°C, add 22.78 grams of tetraethyl orthosilicate to react for half an hour, cool down to 40°C, add a certain amount of neutralizing agent triethylamine and react with carboxyl group for 15 minutes to form a salt. 156.87 ml of water were added and the solvent was distilled off. The silicon dioxide-anionic polyurethane aqueous dispersion with a solid content of 30% can be obtained.

[0032] (3) Electrorheological fluid for preparing silica-waterborne polyurethane nanocomposite:

[0033] Get the prepared silicon dioxide-anionic polyurethane aqueous dispersion and put it in a refrigerator to freeze into ice, and then put it on a freeze drier to dry for 24 hours. Grinding the dried compoun...

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Abstract

The invention discloses a method for preparing electrorheological liquid of silicon dioxide- water polyurethane nanometer compound. The nuclear mateiral of said compound is anion polyurethane with side chain carrying with acid group, the nuclear material is silicon dioxide; the electrorheological liquid takes silicon- dioxide- water polyurethane nanometer compound as dispersing phase, takes dimethicone as dispersing liquid, and the method for preparing comprises following steps: taking ethyl orthosilicate and anion polyurethane with side chain carrying with alkali group as raw material, proceeding hydrolysis, polymerization for ethyl orthosilicate and polyurethane nanometer microcapsule, and then alkali neutralizing, distilling out solvent and getting final product; cooling, drying, grinding and getting powder, mixing it with dimethicone according to ratio by weight of 30- 40: 70. The invention is characterized by simple process, distinctive performance of prepared electrorheological liquid, small drain current density and it is ideal electrorheological material.

Description

technical field [0001] The invention relates to the technical field of a kind of inorganic / organic composite material used to prepare electrorheological fluid, in particular to a preparation method of electrorheological fluid of silicon dioxide-waterborne polyurethane nanocomposite. Background technique [0002] Electrorheological fluid is a kind of smart material that has developed rapidly in recent years. It can respond quickly, reversibly and controllably under the action of an electric field. The theoretical basis of electrorheological fluid technology is the electrorheological effect. The electrorheological effect refers to the phenomenon that the viscosity of a special liquid, which characterizes the flow properties of the liquid, can change significantly at a certain shear rate under the action or control of an electric field, and this change is reversible and continuous. and controllable. This change can make the flowable liquid thicken, harden or even stop flowing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M107/30C10M103/06C10N40/14
Inventor 朱岩陈雨
Owner WUHAN UNIV OF TECH
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