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CMP mixed indictor powder and preparation method thereof

A technology of mixing indicator and powder, which is used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., to prevent oxidation, improve accuracy, and reduce errors.

Inactive Publication Date: 2017-01-11
TIANJIN GUANGFU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method mentioned in the above-mentioned patent documents still does not solve the problems mentioned in the background technology, and needs further improvement

Method used

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  • CMP mixed indictor powder and preparation method thereof
  • CMP mixed indictor powder and preparation method thereof
  • CMP mixed indictor powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of CMP mixed indicator powder, the composition and steps are as follows:

[0025] Weigh 1g of calcein, 0.1g of methyl thymol blue, 0.2g of phenolphthalein, 50g of dry dehydrated filler (filler is one of sodium chloride, potassium nitrate, anhydrous sodium sulfate), reducing agent Na 2 SO 3 0.1g, mixed with grinding evenly, put into aluminum foil bag, heat sealed and sealed for storage.

Embodiment 2

[0027] A preparation method of CMP mixed indicator powder, the composition and steps are as follows:

[0028] Weigh 100g of calcein, 10g of methyl thymol blue, 20g of phenolphthalein, 5kg of filler, reducing agent Na 2 SO 3 10g, mix and pulverize in a pulverizer, weigh the mixed powder 51.4g / bag, put it in an aluminum foil bag, and heat seal it for preservation.

Embodiment 3

[0030] A preparation method of CMP mixed indicator powder, the composition and steps are as follows:

[0031] Weigh 10g of calcein, 1g of methyl thymol blue, 2g of phenolphthalein, 600g of filler, 2g of reducing agent, grind evenly, weigh 61.5g / bag of mixed powder, put it into an aluminum foil bag, heat seal and seal it for storage.

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PUM

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Abstract

The invention relates to a CMP mixed indictor powder and a preparation method thereof. The preparation method comprises the following steps: (1) weighing calcein, methyl thymol blue, phenolphthalein, a dried and dehydrated filling agent, and a reducing agent; (2) grinding abovementioned materials, and finely and evenly milling the materials; and (3) filling the mixed powder into an aluminum foil bag, and thermally sealing the bag. The CMP mixed indicator comprises an acid-base indicator (methyl thymol blue) and phenolphthalein, under a titrimetric pH value (pH>=12.5), the color of the mixed indictor is displayed, the color of calcein is enhanced, the titration end point is sensitive, and thus the titration accuracy is improved.

Description

technical field [0001] The invention belongs to the field of chemical reagents, analysis and silicate chemical industry, in particular to a CMP mixed indicator powder and a preparation method thereof. Background technique [0002] Silicate analysis is one of the main items of industrial analysis, among which the determination of calcium and magnesium is a very important analysis object. Calcium and magnesium are generally determined by complexometric titration. [0003] The choice of indicator in complexometric titration has always been one of the difficult problems in complexometric titration. There are several indicators that can be selected in the process of calcium and magnesium complexometric titration, such as: chrome black T, acid chrome blue K, calcium Reagent sodium carboxylate, calcium reagent, calcein, etc. However, when used alone, the color change is not rapid, and the end point is not easy to judge, resulting in non-repeatable and inaccurate measurement resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 杨万龙张勇
Owner TIANJIN GUANGFU TECH DEV