CN111793205A - Polymethyl Schiff base and preparation method and application thereof - Google Patents

Polymethyl Schiff base and preparation method and application thereof Download PDF

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CN111793205A
CN111793205A CN202010633942.9A CN202010633942A CN111793205A CN 111793205 A CN111793205 A CN 111793205A CN 202010633942 A CN202010633942 A CN 202010633942A CN 111793205 A CN111793205 A CN 111793205A
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corrosion
polymethyl
schiff base
salicylamide
base
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辛格
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Southwest Petroleum University
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
    • C08G73/0633—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
    • C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
    • C07D295/12—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms
    • C07D295/135—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms with the ring nitrogen atoms and the substituent nitrogen atoms separated by carbocyclic rings or by carbon chains interrupted by carbocyclic rings
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
    • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract

The invention discloses a polymethyl schiff base and a preparation method and application thereof, wherein the preparation method comprises the following steps: reacting salicylamide with formaldehyde in a sodium hydroxide solution to obtain a product A; and reacting the product A with piperazine to obtain the polymethyl Schiff base, wherein the salicylamide is prepared by reacting salicylaldehyde with ethylenediamine. The polymethyl schiff base can effectively inhibit corrosion at high temperature, and has the advantages of low cost, high efficiency, convenient use and the like when being used as a corrosion prevention measure; when being suitable for corrosion inhibition of low-carbon steel at high temperature, the corrosion inhibitor has excellent use effect.

Description

Polymethyl Schiff base and preparation method and application thereof
Technical Field
The invention relates to the technical field of Schiff bases, in particular to a polymethyl Schiff base and a preparation method and application thereof.
Background
Schiff base (Schiff base) refers to a class of organic compounds containing imino or methylimino groups. Heretofore, schiff bases and their complexes have found wide application in the fields of medicine, catalysis, analytical chemistry, corrosion, and photochromism. In the corrosion field, Schiff bases can generate a chemical action similar to a coordination bond with metal atoms on the surface of a metal material and are adsorbed on the surface of the metal material, so that the corrosion of the metal material is slowed down, and most of the existing Schiff bases play a role in corrosion inhibition under a low-temperature condition.
In the later exploitation process of an oil field, acidification is one of important measures for increasing the yield of an oil well and increasing the injection of a water well. However, oil well acidizing brings about many problems to oil field construction, such as surface pitting, hydrogen embrittlement, weight loss corrosion and the like of pipelines and downhole metal equipment. Sometimes, the corrosion of the acid liquor can also cause sudden burst accidents of the underground pipe, and serious threats are caused to lives and properties. In recent years, as the existing oil and gas field development in China enters the medium and high water-cut periods, newly-opened oil and gas wells in China are deeper and deeper, the bottom temperature and the bottom pressure are higher and higher, the corrosion problem of an oil and gas production system is more and more serious, and the economic loss caused by the oil and gas field production is more and more large. Therefore, an acid-resistant and high-temperature-resistant corrosion inhibitor is needed.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a polymethylschiff base, which is capable of having excellent corrosion resistance even under boiling hydrochloric acid conditions, and a preparation method and application thereof.
The technical scheme of the invention is as follows:
in one aspect, a polymethylschiff base is provided, wherein the structural formula of the polymethylschiff base is as follows:
Figure BDA0002567102690000011
on the other hand, the preparation method of the polymethyl schiff base comprises the following steps: reacting salicylamide with formaldehyde in a sodium hydroxide solution to obtain a product A; and reacting the product A with piperazine to obtain the polymethyl Schiff base.
Preferably, the salicylamide is prepared by reacting salicylaldehyde with ethylenediamine.
Preferably, the temperature of the reaction of the salicylamide and the formaldehyde is controlled to be 70-80 ℃, and the reaction time is 1 h.
Preferably, the molar ratio of salicylamide to formaldehyde is 1: 2.
Preferably, the temperature for the reaction of the product A and the piperazine is controlled at 110 ℃ and the reaction time is 1 h.
The polymethyl Schiff base can be used as a corrosion inhibitor to slow down the corrosion of metal materials.
Compared with the prior art, the invention has the following advantages:
the polymethyl Schiff base prepared by the method not only has the antibacterial and antifungal activity of the conventional Schiff base, but also has extremely excellent corrosion resistance, and can keep high corrosion resistance in boiling hydrochloric acid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the procedure for preparing a polymethylSchiff base according to example 1 of the present invention;
FIG. 2 is a schematic view of a Tafel plot in Experimental example 2 of the present invention;
FIG. 3 is a schematic view of a scanning electron microscope of Experimental example 3 of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. Unless defined otherwise, technical or scientific terms used in the present disclosure should have the ordinary meaning as understood by those of ordinary skill in the art to which the present disclosure belongs. The use of the terms "comprising" or "including" and the like in the disclosure of the present invention means that the element or item appearing before the term covers the element or item listed after the term and its equivalents, without excluding other elements or items.
Example 1
As shown in fig. 1, a method for preparing a polymethylschiff base comprises the following steps: 2.44g (0.02mol) of salicylamide are introduced into a round-bottom flask containing 25ml of ethanol, and then 0.67g of ethylenediamine (0.01mol) is added drop by drop; acidifying the reaction mixture with 0.5mol of concentrated hydrochloric acid; the reaction was then stirred for two hours to give a yellow crystalline salicylamide. Adding 2ml of 40% sodium hydroxide solution into the mixed solution of salicylamide and formaldehyde with the molar ratio of 1:2, reacting for 1h at 70-80 ℃, adding piperazine, and reacting for 1h at 100-110 ℃ to obtain the polymethyl schiff base (SEPF).
The corrosion inhibition efficiency of the polymethyl schiff base prepared in example 1 on a metal material is analyzed through the following experimental examples, wherein the metal material is a low-carbon steel strip which comprises the following components: c, 0.14%; 0.35 percent of Mn; si, 0.17%; s, 0.025%; p, 0.03%; the balance being Fe. Before the test, the steel sheet was subjected to abrasion processing using 600-, 800-, 1000-and 1200-grade SiC abrasive papers, and subjected to degreasing treatment with acetone, followed by drying. In addition, the polymethylschiff base is mainly used in an acidic environment, and analytical grade 37% HCl is diluted with double distilled water to obtain 15% HCl (v/v).
The corrosion rate was calculated by the following formula:
Figure BDA0002567102690000031
in the formula: cRFor corrosion rate, mg cm-2h-1(ii) a W is the weight loss of the metal material, mg; a is the total area of the metal material in cm2(ii) a t is the soaking time, h;
the surface coverage and inhibition were calculated by the following formula:
Figure BDA0002567102690000032
Figure BDA0002567102690000033
Figure BDA0002567102690000034
in the formula: theta is surface coverage and is dimensionless; eta is inhibition rate,%; cR、CR(i)The corrosion rates of the metal material without corrosion inhibitor and with corrosion inhibitor are mg cm-2h-1；Icorr、Icorr(i)Respectively, the corrosion current density of the metal material without corrosion inhibitor and with corrosion inhibitor, mu A cm-2。
Experimental example 1
Mild steel was soaked for 0.5h in 15% HCl (105 ± 2 ℃) in the absence and presence of different concentrations of SEPF, and the corrosion test results are shown in table 1:
TABLE 1 Corrosion test results
Figure BDA0002567102690000035
As can be seen from table 1, the present invention also has excellent corrosion resistance in boiling hydrochloric acid, and as the concentration of SEPF increases, the corrosion rate decreases and the corrosion inhibition efficiency increases. The entire phenomenon occurs because as the concentration of SEPF increases, the adsorption and coverage area of the mild steel increases.
Experimental example 2
The corrosion inhibition efficiency of the polymethylschiff base prepared in example 1 was analyzed by tafel polarization curve. The tafel polarization curve was tested in a three electrode cell at 35 ℃ ± 2 ℃. A low carbon steel sheet was used as the working electrode of the above composition, and the area was 1 cm square. A graphite rod was used as the counter electrode and a Saturated Calomel Electrode (SCE) as the reference electrode. And carrying out tafel polarization by adopting a Gamry potentiostat/galvanostat of a Gamry frame system based on ESA 400. Applications of Gamry include EIS 300 for EIS measurements, DC 105 software for corrosion, and Echem analysis (version 5.50) software package for data fitting. At a scan rate of 1mVs-1In the case of polarization, which can be obtained by automatic change of the electrode potential ranging from-250 mVSCE to +250mVSCE, in order to test the corrosion inhibition efficiency, the experiments were carried out both with and without SEPE, and the measurements were carried out after soaking in 15% hydrochloric acid for 30 minutes. Various electrochemical parameters such as corrosion potential (Ecorr), corrosion current density (Icorr), surface coverage, corrosion inhibition efficiency, etc. are shown in table 2:
TABLE 2 electrochemical parameter test results
Figure BDA0002567102690000041
The tafel curve is shown in fig. 2. As can be seen from table 2 and fig. 2, both the anodic dissolution of iron and the cathodic hydrogen evolution reaction are retarded with increasing SEPF concentration. The change in the values of the tafel slopes of the anode and cathode was almost constant with increasing concentration, indicating that the mechanism of the anode and cathode reactions did not change. Therefore, the inhibitor is referred to as mixed type. The maximum displacement of Ecorr in the cathodic direction was less than 85mV, i.e., 71mV, indicating that corrosion is mixed corrosion and cathodic effects predominate. As can be seen from the parallel line of the cathode curve, the addition of the corrosion inhibitor in the corrosive environment does not change the hydrogen evolution mechanism and the reduction of hydrogen ions on the surface of the mild steel, and the reduction of the hydrogen ions follows the charge transfer mechanism. The SEPF protective film adsorbed on the surface of the low carbon steel resists corrosion by blocking the reaction sites of the low carbon steel. In this way, the actual available surface area of the hydrogen ions is reduced, while the actual reaction mechanism is not affected. From table 2, it can be seen that the corrosion current density values are significantly reduced in the presence of SEPF, indicating that the low carbon steel surface forms an SEPF protective film that forms a barrier between the metal and the corrosive medium.
Experimental example 3
The corrosion inhibition efficiency of the polymethylschiff base prepared in example 1 was analyzed by Scanning Electron Microscopy (SEM). The results of a Scanning Electron Microscope (SEM) performed using a Ziess Evo 50 XVP instrument at a magnification of 5KX, with a low carbon steel strip immersed in 15% hydrochloric acid at a temperature of 105 ± 2 ℃ and a concentration of polymethyl schiff base of 5000ppm, are shown in fig. 3. FIG. 3a shows the surface of a low carbon steel without inhibitor and FIG. 3b shows the SEPF concentration at 5000mg L-1As can be seen from fig. 3, cracks and pits on the surface of the metallic material due to rapid corrosion attack by HCl are easily observed without inhibitors; in the presence of the inhibitor SEPF, relatively smooth and less corrosive morphology can be observed on the surface of the low-carbon steel, which indicates the condition of high temperature (105 +/-2 ℃), andunder the condition, an SEPF protective film is formed on the surface of the low-carbon steel, and the corrosion of the surface of the low-carbon steel is effectively inhibited, so that the corrosion inhibitor has remarkable progress compared with the prior art.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. A polymethyl schiff base, wherein the structural formula of the polymethyl schiff base is as follows:
Figure FDA0002567102680000011
2. a method for preparing a polymethylschiff base according to claim 1, comprising the steps of: reacting salicylamide with formaldehyde in a sodium hydroxide solution to obtain a product A; and reacting the product A with piperazine to obtain the polymethyl Schiff base.
3. The method of preparing a polymethylschiff base of claim 2, wherein the salicylamide is prepared by reacting salicylaldehyde with ethylenediamine.
4. The method for preparing polymethylschiff base according to claim 2, wherein the temperature of the reaction of the salicylamide with formaldehyde is controlled to be 70-80 ℃ and the reaction time is 1 h.
5. The process for the preparation of polymethylschiff base according to claim 2, wherein the molar ratio of salicylamide to formaldehyde is 1: 2.
6. The method for preparing polymethylschiff base according to claim 2, wherein the temperature for the reaction of the product A and the piperazine is controlled at 110 ℃ and the reaction time is 1 h.
7. Use of the polymethylschiff base of claim 1 as a corrosion inhibitor.
CN202010633942.9A 2020-07-02 2020-07-02 Polymethyl Schiff base and preparation method and application thereof Pending CN111793205A (en)

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Citations (7)

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US5693320A (en) * 1996-03-17 1997-12-02 Ube Industries, Ltd. (Meth)acryloyloxy substituted acetylsalicylates and polymers thereof
WO2004087308A1 (en) * 2003-03-31 2004-10-14 Medical Research Council Method of synthesis and testing of combinatorial libraries using microcapsules
CN107868231A (en) * 2016-09-28 2018-04-03 中科院广州化学有限公司南雄材料生产基地 A kind of Thief zone water-base epoxy slurry and preparation method and application
CN110577829A (en) * 2018-06-08 2019-12-17 中国石油天然气股份有限公司 Cinnamaldehyde Schiff base acidizing corrosion inhibitor, preparation and use method
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Patent Citations (7)

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US4299959A (en) * 1976-04-22 1981-11-10 Ciba-Geigy Corporation Fluorescent pigments
CN1057670A (en) * 1985-09-24 1992-01-08 鲁布里佐尔公司 The metal complex of mannich base
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CN107868231A (en) * 2016-09-28 2018-04-03 中科院广州化学有限公司南雄材料生产基地 A kind of Thief zone water-base epoxy slurry and preparation method and application
CN110577829A (en) * 2018-06-08 2019-12-17 中国石油天然气股份有限公司 Cinnamaldehyde Schiff base acidizing corrosion inhibitor, preparation and use method
CN110776467A (en) * 2019-10-30 2020-02-11 西南石油大学 Corrosion inhibitor based on benzimidazole derivative and preparation method and application thereof

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Application publication date: 20201020