CN112723564A - Dispersion corrosion inhibitor and preparation method thereof - Google Patents
Dispersion corrosion inhibitor and preparation method thereof Download PDFInfo
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- CN112723564A CN112723564A CN202011586800.8A CN202011586800A CN112723564A CN 112723564 A CN112723564 A CN 112723564A CN 202011586800 A CN202011586800 A CN 202011586800A CN 112723564 A CN112723564 A CN 112723564A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 50
- 230000007797 corrosion Effects 0.000 title claims abstract description 50
- 239000003112 inhibitor Substances 0.000 title claims abstract description 31
- 239000006185 dispersion Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title abstract description 12
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims abstract description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- HVAMZGADVCBITI-UHFFFAOYSA-M pent-4-enoate Chemical compound [O-]C(=O)CCC=C HVAMZGADVCBITI-UHFFFAOYSA-M 0.000 claims abstract description 24
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920001577 copolymer Polymers 0.000 claims abstract description 17
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 16
- 229920000805 Polyaspartic acid Polymers 0.000 claims abstract description 14
- 108010064470 polyaspartate Proteins 0.000 claims abstract description 14
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 37
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 abstract description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052916 barium silicate Inorganic materials 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 239000002455 scale inhibitor Substances 0.000 description 5
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 235000011010 calcium phosphates Nutrition 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000668 effect on calcium Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical group C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Abstract
The invention provides a dispersion corrosion inhibitor and a preparation method thereof, wherein the dispersion corrosion inhibitor is mainly prepared from the following raw materials in parts by weight: 20-28 parts of maleic anhydride, 6-12 parts of allyl acetate, 5-15 parts of acrylic acid, 3-8 parts of azobisisobutyronitrile, 10-30 parts of AMPS-AA copolymer, 30-50 parts of polyaspartic acid, 6-18 parts of sodium dodecyl benzene sulfonate and 30-40 parts of deionized water. The dispersion corrosion inhibitor has higher scale inhibition rate on calcium carbonate, and can inhibit the formation of scales such as calcium carbonate, calcium sulfate, barium sulfate, silicate and the like; meanwhile, the corrosion inhibitor has good corrosion inhibition effect, and can effectively clean and operate equipment and pipelines.
Description
Technical Field
The invention relates to a dispersion corrosion inhibitor in the technical field of water treatment, and particularly relates to a dispersion corrosion inhibitor and a preparation method thereof.
Background
Along with the rapid development of the industry in China, the dosage of circulating cooling water also shows a trend of increasing year by year, the increase of the concentration multiple also becomes an effective means for saving the use of circulating water, but simultaneously, the concentration of various ions in the water is relatively increased along with the increase of the concentration multiple, the problems of scaling and corrosion of pipeline equipment inevitably occur, in order to prevent the occurrence of adverse phenomena such as scaling and corrosion of the pipeline, the common solution is to add a certain amount of scale and corrosion inhibitor into the circulating cooling water, in order to achieve better scale and corrosion inhibition effect, the traditional scale and corrosion inhibitor contains phosphate and other substances, although the traditional scale and corrosion inhibitor can effectively prevent scaling and corrosion, eutrophication of a water body can be caused at the later stage, and thus the water environment is seriously polluted. Therefore, how to develop a dispersion corrosion inhibitor which does not pollute the environment is a problem which needs to be solved urgently in the field of sewage treatment.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a dispersion corrosion inhibitor, which is prepared by copolymerizing maleic anhydride and allyl acetate, has stable performance, simple production process, obvious dispersion effect in a system and low corrosion rate, and can effectively prolong the cleaning period of equipment and pipelines.
The second purpose of the invention is to provide the preparation method of the dispersion corrosion inhibitor, the preparation method is simple to operate and low in cost, and the prepared corrosion and scale inhibitor has the advantages of strong pertinence, low cost, environmental friendliness, safety, high efficiency and the like.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a dispersion corrosion inhibitor, which is mainly prepared from the following raw materials in parts by weight: 20-28 parts of maleic anhydride, 6-12 parts of allyl acetate, 5-15 parts of acrylic acid and 3-8 parts of azobisisobutyronitrile; 10-30 parts of AMPS-AA copolymer; 30-50 parts of polyaspartic acid; 6-18 parts of sodium dodecyl benzene sulfonate; 30-40 parts of deionized water.
Preferably, the dispersion corrosion inhibitor is mainly prepared from the following raw materials in parts by weight: 21-27 parts of maleic anhydride, 7-11 parts of allyl acetate, 6-14 parts of acrylic acid and 4-7 parts of azobisisobutyronitrile; 11-29 parts of AMPS-AA copolymer; 31-49 parts of polyaspartic acid; 7-17 parts of sodium dodecyl benzene sulfonate; 31-39 parts of deionized water.
Preferably, the dispersion corrosion inhibitor is mainly prepared from the following raw materials in parts by weight: 22-26 parts of maleic anhydride, 8-10 parts of allyl acetate, 7-13 parts of acrylic acid and 5-6 parts of azobisisobutyronitrile; 12-28 parts of AMPS-AA copolymer; 32-48 parts of polyaspartic acid; 8-16 parts of sodium dodecyl benzene sulfonate; 32-38 parts of deionized water.
In the above starting materials, the carboxylic acid group of the acrylic acid is selected to be Ca2+、Mg2+、Fe2+、Cu2+ the metal ions have strong chelation, and can form stable water-soluble chelate, so that the concentration of free calcium, magnesium and other metal ions in water is reduced; the copolymer of the selected maleic anhydride, the allyl acetate and the acrylic acid is a low molecular weight polyelectrolyte, has strong dispersion effect on carbonate and other polyvalent metal carbonates, phosphate, sulfate scales and the like, can disperse insoluble inorganic salt in water, prevents or interferes the precipitation and scaling of the insoluble inorganic salt on the metal surface, has excellent scale inhibition performance and high temperature resistance, can be used under severe conditions of high temperature of 300 ℃ and the like, and prevents the formation of scale and deposition on a heated surface. In the raw material formula, as the mass ratio of maleic anhydride, allyl acetate and acrylic acid monomer in all components is increased, the scale inhibition rate of maleic anhydride, allyl acetate and acrylic acid copolymer is increased, when the proportion of the three components is less than 30%, the scale inhibition effect is influenced, and in the three components, the scale inhibition rate is optimal when the mass ratio of maleic anhydride to acrylic acid is about 5: 1.
Azodiisobutyronitrile is an oil-soluble azo initiator, and the azo initiator has stable reaction, is a first-order reaction, has no side reaction and is better controlled, so the azodiisobutyronitrile is used as a polymerization initiator for maleic anhydride, allyl acetate and acrylic monomers.
The AMPS-AA copolymer contains carboxylic acid groups with good scale inhibition and dispersion performance and sulfonic acid groups with strong polarity in a molecular structure, so that the tolerance of calcium can be improved, the AMPS-AA copolymer has a remarkable scale inhibition effect on calcium phosphate, calcium carbonate, zinc scale and the like in water, the deposition of iron oxide is prevented, and particularly the scale inhibition rate of the calcium phosphate is high. And excellent in dispersibility. The compound is compounded with organic phosphine, and the synergistic effect is obvious. Is particularly suitable for water with high pH value, high alkalinity and high hardness, and is one of the most ideal scale inhibition and dispersion agents for realizing high concentration multiple operation.
The polyaspartic acid has the main functions of scale inhibition and dispersion and has the corrosion inhibition function. The scale inhibitor is particularly suitable for inhibiting the formation of calcium carbonate scale, calcium sulfate scale, barium sulfate scale and calcium phosphate scale in cooling water, boiler water and reverse osmosis treatment. The scale inhibition rate of calcium carbonate can reach 100%. At the same time, it has a dispersing action and can effectively prevent the corrosion of metal equipment.
The sodium dodecyl benzene sulfonate is neutral, is sensitive to water hardness, is not easy to oxidize, has strong foaming power and high detergency, is easy to be compounded with various auxiliaries, has lower cost, mature synthesis process and wide application field, and is an excellent anionic surfactant. The sodium dodecyl benzene sulfonate has obvious detergency effect on granular dirt, protein dirt and oily dirt, excellent detergency on granular dirt on natural fiber, raised detergency with the raised washing temperature, high protein dirt effect and rich foam. Sodium dodecyl benzene sulfonate is mainly used for preparing various liquid, powder and granular detergents, cleaning agents and the like.
The raw material formula does not contain phosphorus, so the method has no pollution to water areas.
The invention also provides a preparation method of the dispersion corrosion inhibitor, which comprises the following steps:
(A) copolymerizing maleic anhydride and allyl acetate, sequentially adding acrylic acid into a reaction kettle, stirring at a constant speed, heating to 80 ℃, adding azodiisobutyronitrile for 30min for three times, adding once, and continuously stirring and preserving heat after adding;
(B) and after the reaction is finished, stopping stirring, cooling to room temperature, sequentially adding the AMPS-AA copolymer, the polyaspartic acid, the sodium dodecyl benzene sulfonate and the deionized water into the reaction kettle, stirring, heating, keeping the temperature, stopping stirring, and cooling to room temperature to obtain the dispersion corrosion inhibitor.
The method is green and environment-friendly, and the performance of the product is improved by respectively adding different components.
Preferably, the stirring speed of the step A is 60 r/min;
the stirring speed has obvious influence on the reaction speed and the preparation yield of the copolymerization reaction of maleic anhydride, allyl acetate and acrylic acid, and when the stirring speed is selected by the invention, the preparation yield is higher.
Preferably, the stirring temperature of the step A is 80 +/-3 ℃;
the copolymerization reaction temperature has great influence on the reaction speed and the preparation yield, and when the copolymer is prepared, because the activity of the acrylic acid is higher, gel is easily generated when the stirring temperature exceeds 100 ℃, the temperature is controlled to be 80 +/-3 ℃, and the yield is higher.
Preferably, the stirring and heat preservation time in the step A is 2-3 h;
the stirring reaction heat preservation time has great influence on the preparation yield, and when the stirring speed is selected by the invention, the preparation yield is higher.
Preferably, the stirring speed of the step B is 75 r/min;
the stirring speed has obvious influence on the scale inhibition performance of the maleic anhydride, the allyl acetate and the acrylic acid copolymer, and when the stirring speed is selected by the invention, the scale inhibition performance is better;
preferably, the stirring temperature of the step B is 40 +/-3 ℃;
the stirring temperature has obvious influence on the scale inhibition performance of the maleic anhydride, the allyl acetate and the acrylic acid copolymer, and when the stirring temperature is selected by the method, the scale inhibition performance is better;
preferably, the stirring and heat preservation time in the step B is 1-2 h;
by adopting the stirring speed, time and temperature, the efficiency of the prepared corrosion and scale inhibitor is ensured.
Compared with the prior art, the invention has the beneficial effects that:
the dispersion corrosion inhibitor has higher scale inhibition rate on calcium carbonate, and can inhibit the formation of scales such as calcium carbonate, calcium sulfate, barium sulfate, silicate and the like; meanwhile, the corrosion inhibitor has good corrosion inhibition effect, and can effectively clean and operate equipment and pipelines.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
Adding 20 parts of maleic anhydride, 6 parts of allyl acetate and 5 parts of acrylic acid into a reaction kettle, stirring at a constant speed (the rotating speed is 75r/min), heating to 80 +/-3 ℃, adding 3 parts of azodiisobutyronitrile for three times for 30min, adding once, and continuously stirring and preserving heat for 2 hours after the addition. After the reaction is finished, stopping stirring, cooling to room temperature, sequentially adding 10 parts of AMPS-AA copolymer, 30 parts of polyaspartic acid, 6 parts of sodium dodecyl benzene sulfonate and 30 parts of deionized water into a reaction kettle, stirring (rotating speed of 75r/min), heating to 40 +/-3 ℃, preserving heat for 1 hour, stopping stirring, and cooling to room temperature.
Example 2
Adding 25 parts of maleic anhydride, 9 parts of allyl acetate and 10 parts of acrylic acid into a reaction kettle, uniformly stirring (the rotating speed is 75r/min), heating to 80 +/-3 ℃, adding 6 parts of azodiisobutyronitrile for three times for 30min, adding once, and continuously stirring and preserving heat for 2.5 hours after the addition. And after the reaction is finished, stopping stirring, cooling to room temperature, sequentially adding 20 parts of AMPS-AA copolymer, 40 parts of polyaspartic acid, 12 parts of sodium dodecyl benzene sulfonate and 35 parts of deionized water into the reaction kettle, stirring (rotating speed of 75r/min), heating to 40 +/-3 ℃, preserving heat for 1.5h, stopping stirring, and cooling to room temperature.
Example 3
Adding 28 parts of maleic anhydride, 12 parts of allyl acetate and 15 parts of acrylic acid into a reaction kettle, uniformly stirring (the rotating speed is 75r/min), heating to 80 +/-3 ℃, adding 8 parts of azodiisobutyronitrile for three times for 30min, adding once, and continuously stirring and preserving heat for 3 hours after the addition. And after the reaction is finished, stopping stirring, cooling to room temperature, sequentially adding 30 parts of AMPS-AA copolymer, 50 parts of polyaspartic acid, 18 parts of sodium dodecyl benzene sulfonate and 40 parts of deionized water into the reaction kettle, stirring (rotating speed of 75r/min), heating to 40 +/-3 ℃, preserving heat for 2 hours, stopping stirring, and cooling to room temperature.
Comparative example 1
The procedure was as in example 3 except that 10 parts of maleic anhydride was used.
Comparative example 2
The specific procedure was in accordance with example 3, except that 3 parts of allyl acetate were used.
Comparative example 3
The procedure was as in example 3 except that 3 parts of acrylic acid was used.
Comparative example 4
The procedure was as in example 3 except that azobisisobutyronitrile was used in an amount of 1 part.
Comparative example 5
The procedure was as in example 3 except that 5 parts of AMPS-AA copolymer were used.
Comparative example 6
The procedure is in accordance with example 3, except that 15 parts of polyaspartic acid are used.
Comparative example 7
The specific procedure was identical to example 3, except that 3 parts of sodium dodecylbenzenesulfonate were used.
Comparative example 8
Commercial products: TH-619B type corrosion and scale inhibitor
Test results
The scale inhibition dispersion performance and the corrosion inhibition performance of the above examples are tested
The detection of the scale inhibition performance refers to a method for measuring the scale inhibition performance of a GB/T16632-2019 water treatment agent by calcium carbonate deposition; the test results of the corrosion inhibition performance test method refer to GBT 18175-2014 water treatment agent corrosion inhibition performance measurement rotary hanging sheet method, and are shown in Table 1:
TABLE 1 results of the experiment
As can be seen from the data in Table 1, through reasonable component mass ratio, the scale inhibition rate and the corrosion inhibition rate of the dispersion corrosion inhibitor are far higher than those of the corrosion and scale inhibitors purchased in comparative examples 1-8 and on the market. And the effect produced by the formulation adopted in example 3 of the present invention is most excellent.
As a result of comparison between comparative example 1 and example 3, when the amount of maleic anhydride used is 10 parts and the mass ratio between the amount of maleic anhydride and acrylic acid is approximately 2:1, the compatibility thereof is weakened to have a certain influence on the scale inhibition efficiency thereof, thereby reducing the scale inhibition effect.
As for the comparison results of comparative example 2 and example 3, when the amount of allyl acetate is 3 parts, the mass ratio of the maleic anhydride, allyl acetate, and acrylic acid in all the components is decreased, the scale inhibition efficiency is affected, and thus the scale inhibition effect is decreased.
As for the comparison result of comparative example 3 and example 3, when the amount of acrylic acid used is 3 parts, the compatibility with maleic anhydride is weakened, and the mass ratio of maleic anhydride, allyl acetate, and acrylic acid in all the components is reduced, affecting the scale inhibition efficiency, and thus lowering the scale inhibition effect.
Comparing example 3 with examples 1 and 2 in table 1, it can be seen that the corrosion and scale inhibition effect is the best when the components are added in the maximum amount within the range.
In a word, the dispersion corrosion inhibitor provided by the embodiment of the invention has a high scale inhibition rate on calcium carbonate, and can inhibit the formation of scales such as calcium carbonate, calcium sulfate, barium sulfate, silicate and the like; meanwhile, the corrosion inhibitor has good corrosion inhibition effect, and can effectively clean and operate equipment and pipelines.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (10)
1. A dispersing corrosion inhibitor is characterized by being mainly prepared from the following raw materials in parts by weight: 20-28 parts of maleic anhydride, 6-12 parts of allyl acetate, 5-15 parts of acrylic acid, 3-8 parts of azobisisobutyronitrile, 10-30 parts of AMPS-AA copolymer, 30-50 parts of polyaspartic acid, 6-18 parts of sodium dodecyl benzene sulfonate and 30-40 parts of deionized water.
2. The dispersing corrosion inhibitor of claim 1, which is prepared from the following raw materials in parts by weight: 21-27 parts of maleic anhydride, 7-11 parts of allyl acetate, 6-14 parts of acrylic acid, 4-7 parts of azobisisobutyronitrile, 11-29 parts of AMPS-AA copolymer, 31-49 parts of polyaspartic acid, 7-17 parts of sodium dodecyl benzene sulfonate and 31-39 parts of deionized water.
3. The dispersing corrosion inhibitor of claim 1, which is prepared from the following raw materials in parts by weight: 24 parts of maleic anhydride, 9 parts of allyl acetate, 10 parts of acrylic acid, 5.5 parts of azobisisobutyronitrile, 20 parts of AMPS-AA copolymer, 40 parts of polyaspartic acid, 12 parts of sodium dodecyl benzene sulfonate and 35 parts of deionized water.
4. A process for preparing a dispersion corrosion inhibitor according to claims 1 to 3, characterized in that it comprises the following steps:
(A) heating maleic anhydride, allyl acetate and acrylic acid, stirring at a constant speed, heating to 80 ℃, adding azobisisobutyronitrile for three times, adding once every 30-40min, and continuously stirring and preserving heat after adding;
(B) cooling to room temperature, sequentially adding AMPS-AA copolymer, polyaspartic acid, sodium dodecyl benzene sulfonate and deionized water, stirring, heating, keeping the temperature, stopping stirring, and cooling to room temperature.
5. The method of claim 4, wherein the stirring speed in step (A) is 60-65 r/min.
6. The method of claim 4, wherein the stirring temperature in step (A) is 75-83 ℃.
7. The method for preparing a dispersion corrosion inhibitor according to claim 4, wherein the stirring holding time in the step (A) is 2-3 h.
8. The process for preparing a dispersion corrosion inhibitor according to claim 4, wherein the stirring speed in step (B) is 75 r/min.
9. The method of claim 4, wherein the stirring temperature in step (B) is 37-43 ℃.
10. The method for preparing a dispersion corrosion inhibitor according to claim 4, wherein the stirring and holding time of the step (B) is 1-2 h.
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