CN108997204A - A kind of preparation method of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter - Google Patents
A kind of preparation method of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter Download PDFInfo
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- CN108997204A CN108997204A CN201811035940.9A CN201811035940A CN108997204A CN 108997204 A CN108997204 A CN 108997204A CN 201811035940 A CN201811035940 A CN 201811035940A CN 108997204 A CN108997204 A CN 108997204A
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- corrosion inhibiter
- cinnamic acid
- schiff bases
- contracting
- dehydrated alcohol
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/72—Nitrogen atoms
- C07D213/75—Amino or imino radicals, acylated by carboxylic or carbonic acids, or by sulfur or nitrogen analogues thereof, e.g. carbamates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/068—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors compounds containing a C=C bond
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
Abstract
The invention discloses a kind of preparation methods of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter.(1) 1.9824g cinnamic acid is placed in the round-bottomed flask for filling 15mL dehydrated alcohol, is stirred；(2) the 2,6-diaminopyridine addition of 0.5456g is filled in 20mL dehydrated alcohol, dissolves, is slowly added into step (1) gains;(3) dropwise addition 0.15mL glacial acetic acid, 70 DEG C of magnetic agitations, back flow reaction 6 hours, nitrogen protection；(4) it cools down at room temperature, obtains tan precipitate, decompression filters, eluted with dehydrated alcohol, filter cake is dried in vacuo, placed into the beaker equipped with 40mL dehydrated alcohol, stirs, and decompression filters, and filter cake is taken to be dried in vacuo.Gained corrosion inhibiter can apply to the anticorrosion in pickling solution to carbon steel.Present invention process is simple, reproducible, yield is high, and corrosion inhibiter is good to the corrosion mitigating effect of dilute sulfuric acid medium carbon steel.
Description
Technical field
The present invention relates to organic synthesis fields, are related to a kind of preparation method of bis-schiff base-containing corrosion inhibiter, and in particular to one
The preparation method of kind 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter.
Background technique
Carbon steel refers to that carbon content is lower than 2%, and has the iron-carbon alloy [1] of the impurity such as a small amount of silicon, manganese and phosphorus, sulphur.It is wide
It is general be used for machine-building various aspects, especially since the industrial revolution in 18th century, the whole world to carbon steel as various products with
The demand of the raw material of structure (including building, vehicle, electronic equipment, pipeline and household electrical appliance etc.) is continuously increased.Daily
Corrosion layer is inevitably formed in transport, hot rolling, surface treatment, operation and storage, while steel rolling in steel and iron industry etc. needs
The iron scale and other dirts of pickling removal steel surface are wanted, acid cleaning process can not determine pickling terminal, so being easy to make
At " overpickling " phenomenon.Corrosion inhibiter is a kind of anticorrosion chemicals, it, which is added on a small quantity in surrounding medium, to reduce gold significantly
The corrosion rate of category.Compared with other anti-corrosion methods, corrosion inhibiter has the characteristics that easy to use, economical and effective, widely answers
For in industrial production and social life.The research and development and application of corrosion inhibiter are all very paid close attention in countries in the world in recent years, at me
State, which deepens continuously, researchs and develops environment-friendly corrosion inhibitor product and its application technology, reduce because corrosion caused by the wasting of resources and
Environmental pollution has a very important significance propulsion " resource-conserving, environmentally friendly " social construction.
Currently, corrosion of metal means of defence has: isolation method, corrosion inhibitor and electrochemical protection method.Wherein, corrosion inhibiter exists
Without special equipment in use process, without changing the property of metal component, and have many advantages, such as it is at low cost, adaptable,
A small amount of corrosion inhibiter is added in corrosive environment simultaneously physical action and chemical action occurs with metal surface, to significantly drop
The corrosion of low metal material.Therefore, efficient, environmentally protective corrosion inhibiter is developed in further investigation, to promotion corrosion inhibiter in each field
Middle application, abundant inhibiter technology have great importance.
The invention discloses the preparation methods of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter.The method is
Using 2,6-diaminopyridine and cinnamic acid as raw material, using glacial acetic acid as catalyst, 2,6-diaminopyridine contracting cortex cinnamomi can be prepared
Aldehyde Bis-Schiff Bases corrosion inhibiter.
Summary of the invention
The object of the present invention is to provide a kind of simple process, reproducible, high yields to prepare 2,6- diamino-pyridine contracting meat
The preparation method of cinnamic aldehyde Bis-Schiff Bases corrosion inhibiter.
Prepare the specific steps of above-mentioned 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter are as follows:
(1) it measures 1.9824g cinnamic acid to be placed in the round-bottomed flask for filling 15mL dehydrated alcohol, magnetic agitation is uniform；
(2) the 2,6-diaminopyridine addition of 0.5456g is filled in 20mL dehydrated alcohol, has been dissolved with ultrasonic oscillation
Entirely, it is slowly added into step (1) gains and is sufficiently mixed；
(3) 0.15mL is added dropwise into step (2) gains and analyzes pure glacial acetic acid catalyst, under 70 DEG C of constant temperatures, magnetic force
Stirring, back flow reaction 6 hours, whole nitrogen protection；
(4) step (3) acquired solution is cooled down at room temperature, obtains tan precipitate, decompression is filtered, constantly drenched with dehydrated alcohol
It washes, takes out filter cake, filter cake is dried in vacuo, is placed into the beaker equipped with 40mL dehydrated alcohol, it is small with magnetic agitation 2
When, to remove the impurity such as excessive cinnamic acid, glacial acetic acid, then suction filtration is depressurized, filter cake is taken to be dried in vacuo, finally obtains 2,6- diamino
Pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter.
The 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter can apply to the anti-corrosion in pickling solution to carbon steel
Erosion, the dosage of 2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter are 0.001-0.01mol/L.
The present invention has many advantages, such as that simple process, reproducible, yield is high.The double Schiffs of 2,6- diamino-pyridine contracting cinnamic acid
Alkali corrosion inhibiter is applied in pickling solution, and the inhibition to carbon steel works well.
Detailed description of the invention
Fig. 1 is 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter infrared spectrogram in the embodiment of the present invention.
Fig. 2 is the mass spectrogram of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter in the embodiment of the present invention.
Specific embodiment
The present invention is furture elucidated combined with specific embodiments below, but embodiment is not intended to limit protection scope of the present invention.
Embodiment:
Prepare the specific steps of above-mentioned 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter are as follows:
(1) it measures 1.9824g cinnamic acid to be placed in the round-bottomed flask for filling 15mL dehydrated alcohol, magnetic agitation is uniform；
(2) the 2,6-diaminopyridine addition of 0.5456g is filled in 20mL dehydrated alcohol, has been dissolved with ultrasonic oscillation
Entirely, it is slowly added into step (1) gains and is sufficiently mixed；
(3) 0.15mL is added dropwise into step (2) gains and analyzes pure glacial acetic acid catalyst, under 70 DEG C of constant temperatures, magnetic force
Stirring, back flow reaction 6 hours, whole nitrogen protection；
(4) step (3) acquired solution is cooled down at room temperature, obtains tan precipitate, decompression is filtered, constantly drenched with dehydrated alcohol
It washes, takes out filter cake, filter cake is dried in vacuo, is placed into the beaker equipped with 40mL dehydrated alcohol, it is small with magnetic agitation 2
When, to remove the impurity such as excessive cinnamic acid, glacial acetic acid, then suction filtration is depressurized, filter cake is taken to be dried in vacuo, finally obtains 0.7053g's
2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter, yield 70.84%.
Reaction equation is as follows:
Using VECTOR22 type infrared spectrometer, using KBr tabletting, to prepared 2,6-diaminopyridine contracting cinnamic acid
Bis-Schiff Bases corrosion inhibiter is in 4000~500cm-1Scanning in range, carries out infrared spectroscopy structural characterization.By attached drawing 1 it is found that
3384cm-1 does not have discovery-NH nearby2Stretching vibration peak, in 1676cm-1Nearby without the flexible vibration of discovery aldehyde radical (- COH)
Dynamic peak, and there is new chemical bond C=N characteristic absorption peak, illustrate the generation for having schiff bases.
Using Brooker dalton company of U.S. APEX IV type Fourier transform high resolution mass spectrometer in ESI+ mode,
The mass spectrogram of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter is obtained under 150V voltage.From attached drawing 1: [M+H]+
It is molecular ion peak at m/z338.165, matches with the theoretical relative molecular mass 337.45 of measured matter molecule.
2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter corrosion mitigating effect is taken using weight-loss method investigation.Drying for standby
3 groups of experiment carbon steel sample precises on assay balance, processed low-carbon steel disc is immersed in and does not add and adds not
It is respectively 0.001mol/L, 0.005mol/L, 0.01mol/L2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases inhibition with concentration
In the 50mL 1mol/L dilute sulfuric acid of agent, impregnated 4 hours at 30 DEG C.Sample is then taken out, with distilled water flushing, is dehydrated in ethyl alcohol,
Degreasing in acetone is weighed after 4 hours dry.Parallel test three times, calculates corrosion inhibition rate.0.001mol/L, 0.005mol/L,
0.01mol/L2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter is respectively to the corrosion inhibition rate of dilute sulfuric acid medium carbon steel
75.02%, 89.64%, 93.30%.The corrosion inhibition of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter is preferable
Reason is related containing the biggish coordination nitrogen-atoms of multiple electronegativity with its structure, and coordination site is more, can generate multiple absorption
Point, it is larger with conjugated system in molecular configurational, fine and close coating can be formed on carbon steel surface, reduce corrosion.
Claims (2)
1. a kind of preparation method of 2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter, it is characterised in that specific steps
Are as follows:
(2) the 2,6-diaminopyridine addition of 0.5456 g is filled in 20mL dehydrated alcohol, has been dissolved with ultrasonic oscillation
Entirely, it is slowly added into step (1) gains and is sufficiently mixed;
(3) 0.15mL is added dropwise into step (2) gains again and analyzes pure glacial acetic acid catalyst, under 70 DEG C of constant temperatures, magnetic force is stirred
It mixes, back flow reaction 6 hours, whole nitrogen protection；
(4) step (3) acquired solution is cooled down at room temperature, obtains tan precipitate, decompression is filtered, eluted with dehydrated alcohol, is taken out
Filter cake is dried in vacuo by filter cake, is placed into the beaker equipped with 40mL dehydrated alcohol, with magnetic agitation 2 hours, then is depressurized
It filters, takes filter cake to be dried in vacuo, obtain 2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter.
2. the application of 2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter according to claim 1, it is characterised in that
The 2,6-diaminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter can apply to the anticorrosion in pickling solution to carbon steel, and 2,6- bis-
The dosage of aminopyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter is 0.001-0.01 mol/L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811035940.9A CN108997204A (en) | 2018-09-06 | 2018-09-06 | A kind of preparation method of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter |
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| CN201811035940.9A CN108997204A (en) | 2018-09-06 | 2018-09-06 | A kind of preparation method of 2,6- diamino-pyridine contracting cinnamic acid Bis-Schiff Bases corrosion inhibiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705059A (en) * | 2018-12-29 | 2019-05-03 | 西南石油大学 | A kind of asymmetry Shuangzi acidification corrosion inhibitor and preparation method thereof |
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| CN103924249A (en) * | 2013-01-11 | 2014-07-16 | 南京工业大学 | Schiff base pyridine carbon steel acid washing corrosion inhibitor and application thereof |
| CN107501338A (en) * | 2017-09-17 | 2017-12-22 | 桂林理工大学 | A kind of preparation method of 2,6 diamino-pyridine contracting, 4 carboxyl benzaldehyde bis-Schiff base cobalt complexes |
| CN107513078A (en) * | 2017-09-17 | 2017-12-26 | 桂林理工大学 | A kind of preparation method of 2,6 diamino-pyridine contracting, 3 carboxyl benzaldehyde bis-Schiff base cobalt complexes |
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2018
- 2018-09-06 CN CN201811035940.9A patent/CN108997204A/en active Pending
Patent Citations (3)
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| CN103924249A (en) * | 2013-01-11 | 2014-07-16 | 南京工业大学 | Schiff base pyridine carbon steel acid washing corrosion inhibitor and application thereof |
| CN107501338A (en) * | 2017-09-17 | 2017-12-22 | 桂林理工大学 | A kind of preparation method of 2,6 diamino-pyridine contracting, 4 carboxyl benzaldehyde bis-Schiff base cobalt complexes |
| CN107513078A (en) * | 2017-09-17 | 2017-12-26 | 桂林理工大学 | A kind of preparation method of 2,6 diamino-pyridine contracting, 3 carboxyl benzaldehyde bis-Schiff base cobalt complexes |
Non-Patent Citations (2)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705059A (en) * | 2018-12-29 | 2019-05-03 | 西南石油大学 | A kind of asymmetry Shuangzi acidification corrosion inhibitor and preparation method thereof |
| CN109705059B (en) * | 2018-12-29 | 2022-02-11 | 西南石油大学 | Asymmetric gemini acidizing corrosion inhibitor and preparation method thereof |
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Application publication date: 20181214 |