Highly sensitive pH test paper and preparation method thereof

A high-sensitivity, ph test paper technology, applied in the field of high-sensitivity pH 1-14 test paper and its preparation, can solve the problem of paints and solvents affecting the health of operators, poor stability and accuracy of color bars and color blocks, and accurate color In order to achieve the effect of reducing the poor color reproduction, improving safety and environmental protection conditions, and tidy typesetting

Active Publication Date: 2012-06-27
上海馨晟试化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The standard color plate of the existing test paper adopts artificial screen printing, and the toxicity of paint and solvent affects the health of operators
Due to the use of manual screen printing, human factors make the same batch of color plates have poor reproducibility, the color is difficult to be uniform, and the color accuracy is affected
The color block stability and accuracy of the test paper color strip are also poor

Method used

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Examples

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Embodiment Construction

[0022] The invention provides a high-sensitivity pH 1-14 test paper. The pH test paper includes a color-developing strip for detection and a standard color plate. The color-developing strip is made of pH base paper, soaked in a reagent solution, and then dried with hot air at a constant temperature.

[0023] The color strips are refined and processed into booklets, which can be torn apart in strips. For example, there are 20 pieces in one book, and 80 color strips can be formed by tearing the special thread.

[0024] The reagent solution impregnated with the chromogenic strip contains an indicator, and the formula of the indicator includes: 80 grams of bromothymol blue, 50 grams of thymol blue, 30 grams of acid meta-amine yellow, 25 grams of meta-methyl red, methyl bromide 5 grams of phenol green, 12 grams of nitrate yellow, 40 grams of o-cresol phthalein, 3 grams of phenolphthalein, 80 grams of sodium p-nitrophenyl azosalicylate, 40 grams of dadan yellow, 2 grams of fluoresce...

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PUM

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Abstract

The invention relates to a piece of highly sensitive pH test paper and a preparation method thereof, wherein a developing strip is in the form of a piece of pH body paper, which is dipped in a reagent solution and then dried by hot air at constant temperature; the reagent solution contains an indicator; the formula of the indicator contains bromothymol blue, thymol blue, metanil yellow, m-methyl red, bromocresol green, nitrazine yellow, cresol red, phenolphthalein, para-nitrophenylazosalicylate sodium, titan yellow, fluorescent pigment orange red, 5% 4-nitrobenzenediazo-1-naphthol-3.6-sodium disulfonate solution and 30% dissolved ethanol aqueous solution; and the formula of the indicator further contains an aqueous colour fixing agent, a cotton wooden fibre mildew preventive, a special paper mildew preventive and a buffer neutralizer formed by modulating sodium hydroxide and phosphoric acid. The preparation method comprises the following steps of: adjusting the reagent solution till a pH value is up to 6-7.5, uniformly wetting the pH body paper, and drying through hot air at constant temperature. According to the invention, the reagent solution can be adjusted, so that the pH value is up to 6-7.5; steady and precise high sensitivity of the pH1-14 test paper is effectively increased; and the test paper is convenient and simple to use.

Description

technical field [0001] The invention relates to pH test paper, in particular to a highly sensitive pH 1-14 test paper and a preparation method thereof. Background technique [0002] In the field of chemistry, the use of test paper is extremely frequent. It is a type of paper impregnated with chemicals and can be used to test the presence of certain substances in liquids or gases through its color change. [0003] pH test paper is impregnated with various acid-base indicators to test the acidity or alkalinity of the substance, or the approximate pH value of the solution to be tested. A test paper impregnated with potassium iodide for the detection of sulfides. The paper is soft, has good absorption performance, does not swell or break when soaked in water, and is made of cotton pulp or bleached and refined kraft wood pulp, which is free-form beating and copied under low pressure on a fourdrinier paper machine. After being impregnated with different chemicals and dried, it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/80
Inventor 陈伟勇
Owner 上海馨晟试化工科技有限公司
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