Three-stage thixotropy test method for characterizing thixotropic fluid rheology

A test method, thixotropy technology, applied in the direction of testing the strength of materials by applying a stable shear force, can solve the problem of limited structural information

Inactive Publication Date: 2018-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure information obtained by this test method is limited, and the destruction and recovery of the structure is the essential cause of the thixotropic rheological properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] (1) Preparation of artificial hectorite gel:

[0030] Place the artificial hectorite powder in a vacuum drying oven with a desiccant (one or more of anhydrous magnesium sulfate and anhydrous calcium chloride), and fully dry at a constant temperature of 30°C for 24 hours to constant weight; the dried Add the artificial hectorite slowly (3~5 min) into the ultrapure water with a conductivity equal to 18.2 MΩ·cm and a wide-mouthed glass bottle with a cover and a magnetic stirrer, and stir vigorously (400~800 rpm, 20-30 min) and then carry out ultrasonication in an ice bath (ultrasonic power is 100 W, ultrasonic frequency is 40 kHz, and ultrasonic time is 10-30 min), so that the dispersion liquid changes from turbid white to clear and transparent, and the bottle mouth is cleaned with paraffin film. Seal and tighten the bottle cap to obtain the original artificial hectorite solution; place the original artificial hectorite solution in an incubator with constant temperature an...

Embodiment 1

[0037] A three-stage thixotropy test method for characterizing the rheology of artificial hectorite gel, the specific steps are as follows:

[0038] (1) Take artificial hectorite and place it in a vacuum drying oven at 30°C with anhydrous calcium chloride for 24 hours, accurately and quickly weigh 1.2490g of dried artificial hectorite, and slowly add a stirring bar and 48.75 mL of ultra-pure In a wide-mouthed bottle of water, stir while feeding at 100 rpm. After 3 minutes, the feeding is completed. Tighten the bottle cap, increase the stirring speed to 400 rpm, and remove the ice bath after stirring for 25 minutes. Ultrasonic for 15 minutes (ultrasonic power is 100 W, ultrasonic frequency 40 kHz), to obtain a transparent and clear dispersion liquid, sealed with paraffin paper, tightly capped, placed in 25 ℃, 80% constant temperature and humidity box for 4 days to obtain a mass fraction of 2.5 % artificial hectorite gel samples;

[0039] (2) The time-resolved orthogonal superp...

Embodiment 2

[0044] A three-stage thixotropy test method for characterizing the rheology of artificial hectorite dispersions, the specific steps are as follows:

[0045] (1) Take artificial hectorite and place it in a vacuum oven at 30°C with anhydrous calcium chloride for 24 hours, accurately and quickly weigh 1.4978g of dried artificial hectorite, and slowly add a stirring bar and 48.5 mL of ultra-pure In a jar of water, stir while feeding at 150 rpm. After 4 min, the feeding is completed. Tighten the bottle cap, increase the stirring speed to 500 rpm, remove the ice bath and sonicate for 10 min after stirring for 20 min (ultrasonic power is 100 W, ultrasonic frequency 40 kHz), to obtain a transparent and clear dispersion liquid, sealed with paraffin paper, tightly capped, placed in 25 ℃, 80% constant temperature and humidity box for 2 days to obtain a mass fraction of 3 % artificial hectorite gel samples;

[0046] (2) The time-resolved orthogonal superposition rheological test was carr...

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Abstract

The invention discloses a three-stage thixotropy test method for characterizing thixotropic fluid rheology. By improving the characterization method of three-stage thixotropic fluid, the method realizes the in-situ obtaining of a viscoelastic spectrum at the structural destruction and recovery stage while the traditional 3ITT test is performed; evolution of the obtained viscoelastic spectrum alongwith time completely characterizes the structural change of a thixotropic fluid material in a process of structural failure and recovery, so that the real-time change information of a microstructureof the material under a shear field can be obtained, and guidance with an important reference value is provided for the production, processing and application of high thixotropic fluid materials.

Description

technical field [0001] The invention relates to the field of rheological characterization of thixotropic fluids, in particular to a three-stage thixotropy test (3 interval thixotropy test, 3ITT) method for characterizing the rheology of thixotropic fluids. Background technique [0002] Thixotropy fluid is a common time-dependent fluid with a wide range of industrial applications, such as: paint coatings, conductive silver paste, ink, emulsion paste, etc. When the shear rate of a thixotropic fluid suddenly changes from one value to another, it takes a period of time for its viscosity to reach a new steady state value from the old steady state value, and the length of this period depends on the change of temperature and shear rate Factors such as amplitude and absolute value. Thixotropic fluids need to adapt to the process of painting, drooling, spraying, inkjet printing and other conditions and quality requirements according to different specific application fields. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 童真李美凤孙尉翔王涛吴蔚彬
Owner SOUTH CHINA UNIV OF TECH
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