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Preparation method of universal pH test paper

A test paper, a wide range of technology, used in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as error, poor precision, uneven color, etc., to ensure Accuracy and stability, factors that reduce test values, the effect of simple process

Active Publication Date: 2013-04-10
杭州特种纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH wide-range test papers on the existing market have relatively poor precision. The error of the general wide-range test paper pH measurement is about ±2, and it is easily affected by the indoor environment, especially the time. When the test paper leaves the test solution, it will quickly Changes, if not judged quickly, are likely to introduce large errors
[0003] A high-sensitivity pH test paper and its preparation method (CN102519959A) are disclosed on the website of the Intellectual Property Office of the People's Republic of China. This method solves the human factor by using digital advanced offset printing technology instead of manual screen printing to print standard color plates. Caused the same batch of color plates to reappear, uneven color, and then affect the accuracy of the test, but the sensitivity and accuracy of the pH test paper itself has not been well resolved
Moreover, the above-mentioned literature records that in order to ensure that the pH base paper is not affected by acid and alkali corrosion and improve the stability of the pH test paper, water-based color-fixing agent, cotton wood fiber anti-mold agent, and special paper anti-mold agent are added to the indicator formula. , and a buffer neutralizer prepared by sodium hydroxide and phosphoric acid, which not only makes the production process complicated, but also may affect the accuracy of the test when determining certain substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of indicators: 200g of saponin, 128g of m-methyl red, 97g of nitrazine, 420g of dadan yellow, 750g of alizarin yellow R, 1560g of bromothymol blue, 418g of thymol blue, 138g of thymolphthalein, and 45g of phenolphthalein , bromocresol green 38g, o-cresol peptide 420g are dissolved in 700kg of 30% ethanol aqueous solution;

[0019] (2) Impregnation: The pH test paper base paper of the reel enters the impregnation machine successively through the unwinding frame and the paper guide roller. The speed passes through the dipping tank on the dipping machine, and the indicator is evenly coated on the base paper, then squeezed by the rubber guide roller, and then enters the drying device;

[0020] (3) Drying: dry with hot steam under normal pressure, the steam temperature is 100°C, and the time is 1.5 minutes;

[0021] (4) Test: Take a small piece of test paper on a glass slide, dip a clean and dry glass rod into the middle of the test paper, and observe the st...

Embodiment 2

[0023] (1) Preparation indicator: 198g of saponin, 126g of m-methyl red, 99g of nitrazine, 422g of dadan yellow, 748g of alizarin yellow R, 1565g of bromothymol blue, 416g of thymol blue, 140g of thymolphthalein, and 43g of phenolphthalein , bromocresol green 36g, o-cresol peptide 422g, be dissolved in the 30% ethanol aqueous solution of 700kg;

[0024] (2) Impregnation: The pH test paper base paper of the reel enters the dipping machine successively through the unwinding frame and the paper guide roller, adjust the unwinding frame guide roller and the paper guide roller, so that the base paper is in a state of tension and flatness, and the base paper is 2.5m / The speed of s passes through the dipping tank on the dipping machine, and the indicator is evenly coated on the base paper, then squeezed by rubber guide rollers, and enters the drying device;

[0025] (3) Drying: dry with hot steam under normal pressure, the steam temperature is 105°C, and the time is 1 minute;

[002...

Embodiment 3

[0028] (1) Preparation of indicators: 201g of saponin yellow, 128g of m-methyl red, 99g of nitrate yellow, 418g of dadan yellow, 751g of alizarin yellow R, 1565g of bromothymol blue, 419g of thymol blue, 138g of thymolphthalein, and 47g of phenolphthalein , bromocresol green 40g, o-cresol peptide 422g dissolved in 700kg of 30% ethanol aqueous solution;

[0029] (2) Impregnation: The pH test paper base paper of the reel enters the impregnation machine successively through the unwinding frame and the paper guide roller, and the unwinding frame guide roller and the paper guide roller are adjusted so that the base paper is in a tensioned and flat state. The base paper is 3.5m / The speed of s passes through the dipping tank on the dipping machine, and the indicator is evenly coated on the base paper, then squeezed by rubber guide rollers, and enters the drying device;

[0030] (3) Drying: dry with hot steam under normal pressure, the steam temperature is 95°C, and the time is 2 min...

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PUM

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Abstract

The invention relates to a preparation method of universal pH test paper. An indicator is prepared by dissolving Metanil yellow, m-methyl red, nitrazine yellow, titan yellow, alizarin yellow R, bromothymol blue, thymol blue, thymolphthalein, phenolphthalein, bromocresol green and o-cresolphthalein in a 30% ethanol water solution. The preparation method comprises the following steps: previously impregnating base paper of pH test paper in the prepared indicator solution, and drying with heating steam of 95-105 DEG C at normal pressure. The preparation method of universal pH test paper is simple in process, stable in product quality and higher in sensitivity and accuracy in comparison with the common universal test paper, and can be widely used in the fields of scientific research, industry, agriculture, environmental protection, medicine and food.

Description

technical field [0001] The invention belongs to the technical field of detection test papers, and in particular relates to a preparation method of pH wide-range test papers for testing the pH values ​​of liquids and gases. Background technique [0002] pH test paper is widely used in scientific research, industry, agriculture, environmental protection, medicine and food fields to determine the pH value of liquids and gases. The pH wide-range test papers on the existing market have relatively poor precision. The error of the general wide-range test paper pH measurement is about ±2, and it is easily affected by the indoor environment, especially the time. When the test paper leaves the test solution, it will quickly Changes, if not judged quickly, are likely to introduce large errors. [0003] A high-sensitivity pH test paper and its preparation method (CN102519959A) are disclosed on the website of the Intellectual Property Office of the People's Republic of China. This metho...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 吴安波
Owner 杭州特种纸业有限公司
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