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Powder average particle size determination method

A technology of average particle size and measurement method, which is applied in the direction of measuring device, particle size analysis, particle and sedimentation analysis, etc., can solve the problem that consumers have no way to directly distinguish, and achieve the effect of fast test speed, high accuracy and easy operation

Inactive Publication Date: 2013-11-27
CHINESE ACAD OF INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, some pearl powder manufacturers in the market pretend to be fine pearl powder with coarse pearl powder, but consumers have no way to directly distinguish

Method used

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  • Powder average particle size determination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the mensuration of pearl powder Z-1 average particle diameter

[0034] Weigh 0.025g pearl powder Z-1 sample and place it in a 50mL beaker; prepare a 20g / L sodium hexametaphosphate solution; add 2 drops of the prepared sodium hexametaphosphate solution to the beaker, and stir with a glass rod to moisten Wet dispersion; add 20mL deionized water to the beaker, place the solution on an ultrasonic disperser for ultrasonic dispersion for 10 minutes, and obtain a white suspension; take 2mL of the white suspension and drop it into a quartz cuvette, and put it into a laser particle size analyzer In this method, the dispersion liquid is deionized water, the temperature is 25°C, and it is allowed to stand for 5 minutes before scanning, the detection angle of scanning is 90°, the number of measurements is 2 times, and the number of scanning times for each measurement is 20 times. Under the condition of 10s, measure the particle size distribution diagram of pearl powde...

Embodiment 2

[0036] Embodiment 2: the mensuration of pearl powder Z-2 average particle diameter

[0037] Weigh 0.02g pearl powder Z-2 sample and place it in a 50mL beaker; prepare 20g / L sodium hexametaphosphate solution; add 2 drops of the prepared sodium hexametaphosphate solution to the beaker, and stir with a glass rod to moisten Wet dispersion; add 15mL deionized water to the beaker, place the solution on an ultrasonic disperser for ultrasonic dispersion for 20 minutes, and obtain a white suspension; take 2mL of the white suspension and drop it into a quartz cuvette, and put it into a laser particle size analyzer In the above conditions, the dispersion liquid is deionized water, the temperature is 25°C, the condition is to stand still for 5 minutes before scanning, the detection angle is 90°, the number of measurements is 4 times, the number of times of each scan is 15 times, and the running time of each time is 10s. Next, measure the particle size distribution of pearl powder.

[003...

Embodiment 3

[0039] Embodiment 3: the mensuration of pearl powder Z-3 average particle diameter

[0040] Weigh 0.05g pearl powder Z-3 sample and place it in a 50mL beaker; prepare a 20g / L sodium hexametaphosphate solution; add 2 drops of the prepared sodium hexametaphosphate solution to the beaker, and stir with a glass rod to moisten Wet dispersion; add 20mL deionized water to the beaker, place the solution on an ultrasonic disperser for ultrasonic dispersion for 20 minutes, and obtain a white suspension; take 2mL of the white suspension and drop it into a quartz cuvette, and put it into a laser particle size analyzer In the above conditions, the dispersion liquid is deionized water, the temperature is 25°C, the condition is to stand still for 5 minutes before scanning, the detection angle is 90°, the number of measurements is 3 times, the number of times of each scan is 25 times, and the running time of each time is 10s. Next, measure the particle size distribution of pearl powder.

[0...

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Abstract

The invention discloses a powder average particle size determination method. According to the method, 0.02-0.1g of powder to be measured is weighed and placed into a 50mL beaker; a dispersing agent and deionized water are mixed into a dispersing agent solution with a concentration of 15-25g / L. 2-5 drops of the prepared dispersing agent solution is dropped into the beaker; stirring, wetting, and dispersing are carried out by using a glass rod; 10-20mL of deionized water is added into the beaker; the solution is subjected to ultrasonic dispersing, such that a white suspension liquid is obtained; 1.5-3mL of the white suspension liquid is dropped into a quartz cuvette; and the cuvette is placed into a laser particle size analyzer, such that pearl powder particle size distribution diagram is determined, and an average particle size is calculated. The method provided by the invention can be used for determining average particle sizes of pearl powder, shell powder, and the like. The determination method provided by the invention has the advantages of high testing speed, good repeatability, high accuracy, simple operation, and the like.

Description

technical field [0001] The invention relates to a method for measuring the average particle diameter of powders such as pearl powder and shell powder. Background technique [0002] Pearls are not only valuable decorations, but also valuable Chinese medicinal materials, which have the effect of health care and beauty. It has a history of more than 2,000 years in China. Pearls, whether used for cosmetic or medicinal purposes, are used by crushing them into powder form. Pearl powder is valued and favored by people in many industries such as medicine, health food, and beauty cosmetics. [0003] The particle size of pearl powder will directly affect the human body's absorption of active ingredients in pearl powder and the efficacy of pearl powder. The finer the pearl powder, the higher the absorption rate and the better the effect, but the more difficult the processing technology is, the higher the price. Therefore, some pearl powder manufacturers in the market pretend to be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
Inventor 席广成胡超闫妍张轩李俊芳杨海峰卢晓静白桦
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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