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Method for measuring water absorbing capacity of silica

A technology of silicon dioxide and determination method, which is applied in the direction of using material absorption and weighing, etc., can solve the problems of wrong type judgment, application error, unqualified toothpaste products, etc., and achieves the effect of small human error, accurate method and easy operation.

Active Publication Date: 2012-08-15
ZHAOQING SANJIANG SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This test method has cumbersome steps and a large error in human operation, and its error range is greater than ±2, which can easily lead to wrong judgments on the type of silica used in toothpaste, eventually leading to application errors and even unqualified toothpaste products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 20g of silicon dioxide and disperse it in 200g of distilled water to obtain a uniform aqueous dispersion of silicon dioxide; (2) add the aqueous dispersion of silicon dioxide to the filter, Suction filtration under vacuum until no more water drops are drawn out, and the vacuum degree is maintained for 10 minutes to obtain a filter cake saturated with water absorption of silica; (3) Measure the water content of the silica filter cake on a moisture analyzer. The rate Q is 69.2%.

[0021] Weigh 20g of silicon dioxide of the same weight, and adopt the burette titration method according to the determination method of water absorption in QB / T 2346-2007 "Silicon Dioxide for Toothpaste", drop the distilled water in the burette into the container containing the silicon dioxide sample. In the dry enamel cup, keep stirring, keep dropping and shaking until the sample powder becomes a ball and stops. According to this burette titration method, the water absorption W of the si...

Embodiment 2

[0023] Weigh 20g of silicon dioxide and disperse it in 100g of distilled water to obtain a uniform aqueous dispersion of silicon dioxide; (2) Add the aqueous dispersion of silicon dioxide to the filter, Suction filtration under vacuum until no more water droplets are drawn out, and keep the vacuum for 15 minutes to obtain the filter cake after the silica absorbs water; (3) Measure the moisture content of the silica filter cake on the moisture analyzer Q is 72.50%.

[0024] Weigh 20g of silicon dioxide of the same weight, and adopt the burette titration method according to the determination method of water absorption in QB / T 2346-2007 "Silicon Dioxide for Toothpaste", drop the distilled water in the burette into the container containing the silicon dioxide sample. In the dry enamel cup, keep stirring, keep dropping and shaking until the sample powder becomes a ball and stops. According to this burette titration method, the water absorption W of the silica was 32.6 ml. Take 20...

Embodiment 3

[0030] (1) Weigh 15g of silicon dioxide and disperse it in 120g of distilled water to obtain an aqueous dispersion of silicon dioxide;

[0031] (2) Add the aqueous dispersion of silica to the solvent filter, and perform suction filtration at a vacuum of -0.93MPa until no more water droplets are drawn out, and keep the vacuum for 10 minutes to obtain the silica after absorbing water. filter cake;

[0032] (3) Measure the moisture content Q of the silica filter cake on a moisture analyzer to be 58.66%;

[0033] (4) According to the water content Q of 58.66%, it is determined that the type of silica is friction type, and the empirical correlation coefficient K between the water content Q and the water absorption W can be taken as 3.15;

[0034] (5) According to the water absorption W=Q×100 / K, the calculated water absorption is 18.6 ml.

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Abstract

The invention discloses a method for measuring water absorbing capacity of silica. The method comprises the following steps of: (1), weighing silica with a certain weight, and dispersing the silica into distilled water to ensure that the mass ratio of the silica to the distilled water is 1: (5-10) to obtain a water dispersion solution of the silica; (2), adding the water dispersion solution of the silica into a solvent filter, filtering under the vacuum degree of (-0.98)-(-0.92)MPa until no water drops are pumped out, and keeping the vacuum degree for 10min to obtain a filter cake after the silica absorbs water; (3), measuring the water content Q of the filter cake of the silica on a water measurer; and (4), obtaining the water absorbing capacity W from the measured water content Q according to a formula of W=Q*100 / K, wherein K represents an experience correlation coefficient of the water content Q and the water absorbing capacity W.

Description

technical field [0001] The invention relates to a method for measuring the water absorption of silicon dioxide, in particular to a method for measuring the water absorption of silicon dioxide for toothpaste. [0002] Background technique [0003] Toothpaste is a hydrophilic system that is uniformly mixed with various components. The silica used in toothpaste is called silica for toothpaste, which has good thixotropy and abrasive cleaning properties, and is chemically stable and does not react with other ingredients in toothpaste (such as fluoride, Chinese herbal medicine, spices, etc.) , with the best compatibility. [0004] The water absorption of silica and its water absorption have an important impact on the performance and stability of toothpaste. Water absorption is an important performance index of silica used in toothpaste. Accurate control and measurement of the water absorption of silica used in toothpaste is of great significance for the production of toothpaste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
Inventor 林英光王宪伟赵国法
Owner ZHAOQING SANJIANG SILICON MATERIALS CO LTD
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