CN100533130C - pH test paper capable of maintaining stabilization and method for preparing the same - Google Patents
pH test paper capable of maintaining stabilization and method for preparing the same Download PDFInfo
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- CN100533130C CN100533130C CNB2006100305448A CN200610030544A CN100533130C CN 100533130 C CN100533130 C CN 100533130C CN B2006100305448 A CNB2006100305448 A CN B2006100305448A CN 200610030544 A CN200610030544 A CN 200610030544A CN 100533130 C CN100533130 C CN 100533130C
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- test paper
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- polyvinyl alcohol
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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
The present invention relates to a kind of test paper of detecting solution acid alkalinity and preparation method thereof that is used to, relate in particular to a kind of maintenance stable p H test paper and preparation method thereof.
Background technology
Detect the method for solution acid alkalinity, have pH instrument and pH test paper commonly used are measured.And the pH test paper because of its have simple and easy, easily and fast, the characteristics of inexpensive and non-secondary pollution, be widely used in chemical analysis, fields such as industry, agricultural and aquaculture, and in water quality, urine, blood analysis and the daily life, existing technology adopts directly dipping making pH test paper in different indicator solutions of carrier.This test paper instability in storage and use, is subjected to the influence of acid, alkali gas and humid air in the outside air, the shortcoming that color dot or variable color have lost the test paper function can occur.The term of validity of test paper is short.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming in the background technology, provide a kind of and under the airborne acid in the external world, alkali gases affect, can keep stable p H test paper and preparation method thereof.
The present invention is achieved in that this maintenance stable p H test paper is to flood coating layer of polyethylene alcohol diaphragm on the pH test paper of indicator.
The degree of polymerization of the polyvinyl alcohol (PVA) that is coated with among the present invention is 1000～2000.
The poly-vinyl alcohol solution that is used to be coated with among the present invention is that polyvinyl alcohol concentration is the ethanol water of 0.5～5 weight %, and the weight ratio of second alcohol and water is 0.6:1.2～1.0:1.2 in the ethanol water, and its pH value equals 4-8.
The preparation method of maintenance stable p H test paper of the present invention is the pH test paper that flooded indicator flooded for 5～10 seconds in polyvinyl alcohol water solution after, is placed in the drying box with hot-air or infrared radiation drying 70～100 ℃ of baking temperatures; The configuration of polyvinyl alcohol (PVA) ethanol water is that polyvinyl alcohol (PVA) is dissolved in the mixed solution of second alcohol and water with 0.5～5 weight % concentration, the weight ratio of second alcohol and water is 0.6:1.2～1.0:1.2 in the mixed solution, and the pH value with NaOH or HCl regulator solution is 4～8 then.Dried pH test paper is through cutting and binding slivering, circle or basis.
Compared with prior art, the present invention has following advantage:
PH test paper of the present invention be through polyvinyl alcohol (PVA) dipping have polyhydroxy, hydrophilic substance that cohesion is strong is filmed, it combines with hydroxyl bond with oxygen in the test paper carrier fibre element, at the surperficial formation of test paper layer protecting film.When humid air contacts with the pH test paper with carbon dioxide in a spot of acid, alkali gas or environment, combine with hydroxyl and only to be stored in the rete, can play barrier effect.When a large amount of water or solvent existed, rete rose brokenly and can reach indicator layer by film smoothly.All can not keep it stable so general technology is produced the pH test paper, also do not have the regulation of the term of validity on product, the term of validity of the pH test paper product that the art of this patent is produced is 2-3.The present invention has not only kept the stable of pH test paper, and it is more firm simultaneously indicator and carrier fibre element to be combined, and indicator runs into solvent and is difficult for running off, and also makes solution impregnation to be measured even, and testing result is more accurate.
The molecular formula of the polyvinyl alcohol (PVA) that relates among the present invention is:
Embodiment
Manufacturing process: the pH test paper that has flooded indicator floods in the polyvinyl alcohol (PVA) ethanol water and takes out dry back after 5～10 seconds and obtain.
The preparation of maceration extract: with concentration is that 0.5～5 weight % degree of polymerization is that 1000～2000 polyvinyl alcohol (PVA) is dissolved in the mixed solution of second alcohol and water, the weight ratio of second alcohol and water is 0.6:1.2～1:1.2 in the mixed solution, and the pH value with NaOH or HCl regulator solution equals 4～8 then.
The preparation of test paper: take out the pH test paper that has flooded indicator flooded for 5～10 seconds in the polyvinyl alcohol (PVA) ethanol water for preparing after and in drying box, use hot-air dry; baking temperature is 70～100 ℃, the coating that obtains the pH test paper of polyvinyl alcohol (PVA) diaphragm through cutting and binding slivering, circle or this.This pH test paper can keep stable in air and small amount of acid, alkali gas, the term of validity is 2～3 years.
Colour atla is made: will need with hydrochloric acid, potassium chloride (c=0.2 mol) preparation pH=1.0 and pH=2.0 standard solution.With HCI (c=0.1 mol); Potassium Hydrogen Phthalate c=0.2 mol is mixed with pH=3.0, pH=4.0 standard solution; Be mixed with the pH value with NaOH c=0.1 mol, phosphoric acid c=0.2 mol and be respectively 6.0,7.0,8.0 standard solution; With hydrochlorinate sodium c=0.1 mol, phosphoric acid c=0.4 mol, potassium chloride c=0.4 mol, be mixed with the pH value and be respectively 9.0,10.0 standard solution; Be mixed with the pH value with NaOH c=0.1 mol, aminoacetic acid c=0.2 mol, potassium chloride c=0.2 mol and be respectively 11.0,12.0,13.0 standard solution; Be mixed with the standard solution of pH=14.0 with NaOH c=0.1 mol.Test paper is immersed taking-up immediately in the above-mentioned standard solution respectively.Modulate colour atla according to the colour developing after 5 seconds.
Connect the above-mentioned preparing standard solution that needs, make the standard solution of pH1～14 respectively.Test paper is immersed in the standard solution, take out immediately, modulate colour atla according to the colour developing after its 5 seconds.
Using method: get test strips, immerse in the liquid to be measured and take out immediately, relatively can directly draw test result with standard color card after 5 seconds.
Claims (2)
1, a kind of maintenance stable p H test paper is characterized in that flooding coating layer of polyethylene alcohol diaphragm on the pH test paper of indicator; The degree of polymerization of the polyvinyl alcohol (PVA) of described coating is 1000～2000; The poly-vinyl alcohol solution that is used to be coated with is that polyvinyl alcohol concentration is the ethanol water of 0.5～5 weight %, and the weight ratio of second alcohol and water is 0.6:1.2～1.0:1.2, and its pH value equals 4～8.
2, the preparation method of maintenance stable p H test paper according to claim 1, it is characterized in that: after the pH test paper that has flooded indicator is placed on and flooded for 5～10 seconds in the polyvinyl alcohol (PVA) ethanol water, be placed in the drying box with hot-air or infrared radiation drying 70～100 ℃ of baking temperatures; The configuration of polyvinyl alcohol (PVA) ethanol water is that polyvinyl alcohol (PVA) is dissolved in the mixed solution of second alcohol and water with 0.5～5 weight % concentration, the weight ratio of second alcohol and water is 0.6:1.2～1.0:1.2 in the mixed solution, and the pH value with NaOH or HCI regulator solution equals 4～8 then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100305448A CN100533130C (en) | 2006-08-29 | 2006-08-29 | pH test paper capable of maintaining stabilization and method for preparing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100305448A CN100533130C (en) | 2006-08-29 | 2006-08-29 | pH test paper capable of maintaining stabilization and method for preparing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101135648A CN101135648A (en) | 2008-03-05 |
| CN100533130C true CN100533130C (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100305448A Active CN100533130C (en) | 2006-08-29 | 2006-08-29 | pH test paper capable of maintaining stabilization and method for preparing the same |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519959B (en) * | 2011-12-15 | 2014-05-07 | 上海馨晟试化工科技有限公司 | Highly sensitive pH test paper and preparation method thereof |
| CN102608113B (en) * | 2012-03-30 | 2014-08-13 | 上海三爱思试剂有限公司 | Mildew-proof pH test paper and preparation method thereof |
| CN104535712A (en) * | 2014-12-26 | 2015-04-22 | 华南师范大学 | Test paper for rapidly testing nitrite and standard colourimetric card and application of test paper |
| CN105648834B (en) * | 2016-01-08 | 2017-11-10 | 昆明泊银科技有限公司 | A kind of overlay film chemical detection test paper and preparation method thereof |
| CN106996931A (en) * | 2016-01-26 | 2017-08-01 | 福建大北农水产科技有限公司 | A kind of pH quick detection kits of breeding water body |
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2006
- 2006-08-29 CN CNB2006100305448A patent/CN100533130C/en active Active
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| CN101135648A (en) | 2008-03-05 |
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