CN102087243A - Method for measuring acid value of deep-color resin through potentiometric titration - Google Patents
Method for measuring acid value of deep-color resin through potentiometric titration Download PDFInfo
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- CN102087243A CN102087243A CN2009102000490A CN200910200049A CN102087243A CN 102087243 A CN102087243 A CN 102087243A CN 2009102000490 A CN2009102000490 A CN 2009102000490A CN 200910200049 A CN200910200049 A CN 200910200049A CN 102087243 A CN102087243 A CN 102087243A
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- koh
- titration
- resin sample
- potentiometric
- acid value
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Abstract
The invention relates to a method for measuring an acid value of deep-color resin through potentiometric titration, which is characterized by comprising the following steps of: accurately weighing a resin sample according to the accuracy of 0.1mg; stirring and dissolving the resin sample by using acetone; fixing a container filled with the dissolved resin sample on a potentiometric titrimeter; titrating the dissolved resin sample in the container by using solution of KOH-ethanol; and when a terminal point is reached, reading an equal percentage (EQP) point, and calculating a result according to the following formula: the acid value (AV)=[titer (ml) of the solution of KOH-ethanol*concentration (N) of the solution of KOH-ethanol*56.1]/the weight (g) of the sample.
Description
Technical field
The present invention designs a kind of acid value measuring method of dark resin.
Background technology
The general chemistry titrimetry is that the indicator change color is indicated titration end-point when relying on the arrival equivalent point.When if testing sample solution has darker color or muddiness takes place, the indication of terminal point is just relatively more difficult.
Potentiometric titration is to indicate titration end-point by the hop of electrode potential.In titration process, along with the continuous adding of titrant, electrode potential e constantly changes, and before and after titration was reached home, the ion concentration to be measured in the dropping liquid often changed n the order of magnitude continuously, causes the hop of current potential.During electrode potential generation hop, illustrate that titration reaches home.The content of tested composition still calculates by the amount that consumes titrant.
The underlying instrument device of potentiometric titration comprises buret, titration cell, indicator electrode, contrast electrode, stirrer, surveys the instrument of electromotive force.Use automatical potentiometric titrimeter, can draw titration curve automatically in titration process, find out titration end-point automatically, provide volume automatically, titration is efficient and convenient.Potentiometric titration curve promptly is the carrying out along with titration, and electrode potential value (cell emf) e is to the figure of the adding volume v mapping of standard solution.
Acid value measuring method to dark resin (iron cobalt tintmeter is more than 5 grades) does not also have effective potentiometric titration at present.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing the acid number of the dark resin of potentiometric determination, with the acid number of the dark resin of accurate measurement.
The method of utilizing the acid number of the dark resin of potentiometric determination of the present invention is characterized in, may further comprise the steps: accurate weighing resin sample is accurate to 0.1mg; Utilize acetone stirring and dissolving resin sample; The container that dissolved resin sample is housed is fixed on the potentiometric titrimeter; With dissolved resin sample in this container of KOH-ethanolic solution titration; When reaching home, read the EQP point, according to the following equation result of calculation: acid number AV=(KOH-ethanolic solution titer (ml) * KOH-ethanolic solution concentration (N) * 56.1)/example weight (g).
The invention has the beneficial effects as follows that by reasonably selecting titrant and tested liquation, can measure the acid number of dark resin with potentiometric titration, this method is simple and measurement result is accurate on potentiometer.
Embodiment
Following embodiment utilizes automatical potentiometric titrimeter that the acid number of dark resin is measured.
The present invention is as follows to the acid value measuring method of dark resin (iron cobalt tintmeter is more than 5 grades):
1. require to set titration method at the potentiometric titration operation interface of automatical potentiometric titrimeter according to instrument in advance.
2. the accurate about 2.0g of weighing resin sample in potentiometric titration special plastic cup is accurate to 0.1mg.
3. in the special plastic cup, add 40ml acetone stirring and dissolving resin sample (will reserve 10ml acetone and be used for washing stirring rod).
4. the plastic cup that sample will be housed is fixed on the potentiometric titrimeter.
5. on potentiometric titrimeter, select the titration method of setting, the input example weight.
6. connect suitable electrode.
7. start the titration method of setting, instrument begins titration automatically.
8. use the KOH-ethanolic solution titration of 0.1N.
9. titration finishes automatically when reaching home, and reads EQP point (equivalent point), result of calculation
10. computing formula
11. instrument disturbs because of sample solution impurity sometimes, a plurality of catastrophe points are arranged, when instrument can't provide the EQP point automatically, need manually to draw, select the catastrophe point of slope maximum. concrete operations are: click on potentiometric titration curve figure and reappraise tool bar, to select camber intersection point tangent line instrument, manually find intersection point. the horizontal ordinate milliliter number of intersection point correspondence is the EQP point.
Claims (1)
1. a method of utilizing the acid number of the dark resin of potentiometric determination is characterized in that, may further comprise the steps:
Accurately the weighing resin sample is accurate to 0.1mg.
Utilize acetone stirring and dissolving resin sample;
The container that dissolved resin sample is housed is fixed on the potentiometric titrimeter;
With dissolved resin sample in this container of KOH-ethanolic solution titration;
When reaching home, read the EQP point, according to the following equation result of calculation:
Acid number AV=(KOH-ethanolic solution titer (ml) * KOH-ethanolic solution concentration (N) * 56.1)/example weight (g).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102000490A CN102087243A (en) | 2009-12-07 | 2009-12-07 | Method for measuring acid value of deep-color resin through potentiometric titration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102000490A CN102087243A (en) | 2009-12-07 | 2009-12-07 | Method for measuring acid value of deep-color resin through potentiometric titration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102087243A true CN102087243A (en) | 2011-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102000490A Pending CN102087243A (en) | 2009-12-07 | 2009-12-07 | Method for measuring acid value of deep-color resin through potentiometric titration |
Country Status (1)
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| CN (1) | CN102087243A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778532A (en) * | 2012-08-10 | 2012-11-14 | 深圳市华星光电技术有限公司 | Potentiometric titration method of mixed acid concentration in aluminum etching liquid |
| CN109298129A (en) * | 2018-11-20 | 2019-02-01 | 四川中烟工业有限责任公司 | A method of measurement essence spice for cigarette acid value |
| CN112098593A (en) * | 2020-09-21 | 2020-12-18 | 山东东岳高分子材料有限公司 | Method for testing acid value content of perfluoropolyether |
-
2009
- 2009-12-07 CN CN2009102000490A patent/CN102087243A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 中华人民共和国国家质量监督检验疫总局,中国国家标准化管理委员会: "《中华人民共和国国家标准GB/T 6743-2008 塑料用聚酯树脂、色漆和清漆用漆基部分酸值和总酸值的测定》", 4 June 2008 * |
| 刘红军: "210#松香改性酚醛树脂的非水溶液电位滴定", 《林产化工通讯》 * |
| 王英杰，车群: "电位滴定法测深色石油产品的酸值", 《济南防止化纤科技》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778532A (en) * | 2012-08-10 | 2012-11-14 | 深圳市华星光电技术有限公司 | Potentiometric titration method of mixed acid concentration in aluminum etching liquid |
| CN102778532B (en) * | 2012-08-10 | 2016-03-09 | 深圳市华星光电技术有限公司 | The potentiometric titration method of aluminium etching solution nitration mixture concentration |
| CN109298129A (en) * | 2018-11-20 | 2019-02-01 | 四川中烟工业有限责任公司 | A method of measurement essence spice for cigarette acid value |
| CN112098593A (en) * | 2020-09-21 | 2020-12-18 | 山东东岳高分子材料有限公司 | Method for testing acid value content of perfluoropolyether |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110608 |