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Ph test paper capable of maintaining stabilization and method for preparing the same

A ph test paper, a stable technology, applied in the field of pH test paper and its preparation, can solve the problems of color point, discoloration, loss of test paper function, etc., and achieve the effect of accurate test results, firm combination, and not easy to lose

Active Publication Date: 2008-03-05
上海三爱思试剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of test paper is unstable. During storage and use, it is affected by acid, alkali gas and humid air in the outside air, and it will appear color spots or discoloration and lose the function of the test paper.
Test strips have a short validity period

Method used

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  • Ph test paper capable of maintaining stabilization and method for preparing the same

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Embodiment Construction

[0012] Production process: the pH test paper impregnated with the indicator is obtained after being immersed in polyvinyl alcohol ethanol aqueous solution for 5-10 seconds, taken out and dried.

[0013] Preparation of impregnation solution: dissolve polyvinyl alcohol with a concentration of 0.5-5% by weight and a degree of polymerization of 1000-2000 in a mixed solution of ethanol and water, and the weight ratio of ethanol and water in the mixed solution is 0.6:1.2-1:1.2 , and then adjust the pH of the solution to 4-8 with NaOH or HCl.

[0014] Preparation of test paper: The pH test paper impregnated with the indicator is immersed in the prepared polyvinyl alcohol ethanol aqueous solution for 5 to 10 seconds, then taken out and dried in a drying oven with hot air at a drying temperature of 70 to 100°C. The pH test paper with polyvinyl alcohol protective film is cut and bound into strips, circles or books. The pH test paper can remain stable in air and a small amount of acid a...

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PUM

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Abstract

The method comprises: coating a layer of polyvinyl alcohol protective film on the pH test paper containing adsorption indicator; shielding the acid, alkali in the outside air and the moisture air from the pH test paper in order to keep the quality and stability of the pH test paper.

Description

technical field [0001] The invention relates to a test paper for detecting the pH of a solution and a preparation method thereof, in particular to a stable pH test paper and a preparation method thereof. Background technique [0002] The methods for detecting the pH of a solution are commonly used with a pH meter and pH test paper. The pH test paper is widely used in chemical analysis, industry, agriculture and aquaculture and other fields, as well as water quality, urine, blood analysis and daily life because of its simplicity, convenience, rapidity, low price and no secondary pollution. , the existing technology uses the carrier to directly immerse in different indicator solutions to make pH test paper. This kind of test paper is unstable. During storage and use, it is affected by acid, alkali gas and humid air in the outside air, and there will be color spots or discoloration and lose the function of the test paper. The validity period of the test strip is short. Cont...

Claims

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Application Information

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IPC IPC(8): G01N21/80
Inventor 王守渔柯德宏
Owner 上海三爱思试剂有限公司