CN113912197A - Softened water closed system corrosion inhibitor and preparation method thereof - Google Patents
Softened water closed system corrosion inhibitor and preparation method thereof Download PDFInfo
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- CN113912197A CN113912197A CN202111331864.8A CN202111331864A CN113912197A CN 113912197 A CN113912197 A CN 113912197A CN 202111331864 A CN202111331864 A CN 202111331864A CN 113912197 A CN113912197 A CN 113912197A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 90
- 238000005260 corrosion Methods 0.000 title claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000003112 inhibitor Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000008367 deionised water Substances 0.000 claims abstract description 28
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052802 copper Inorganic materials 0.000 claims abstract description 27
- 239000010949 copper Substances 0.000 claims abstract description 27
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920001577 copolymer Polymers 0.000 claims abstract description 18
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 18
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims abstract description 17
- 239000011609 ammonium molybdate Substances 0.000 claims abstract description 17
- 235000018660 ammonium molybdate Nutrition 0.000 claims abstract description 17
- 229940010552 ammonium molybdate Drugs 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims description 55
- 238000001816 cooling Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 5
- 239000013065 commercial product Substances 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002455 scale inhibitor Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- DDAQLPYLBPPPRV-UHFFFAOYSA-N [4-(hydroxymethyl)-2-oxo-1,3,2lambda5-dioxaphosphetan-2-yl] dihydrogen phosphate Chemical compound OCC1OP(=O)(OP(O)(O)=O)O1 DDAQLPYLBPPPRV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 description 2
- 235000011010 calcium phosphates Nutrition 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 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 2
- DMOXNIKYXJYCFQ-UHFFFAOYSA-N (2-hydroxy-1-phosphonooxyethyl) dihydrogen phosphate Chemical compound OP(=O)(O)OC(CO)OP(O)(O)=O DMOXNIKYXJYCFQ-UHFFFAOYSA-N 0.000 description 1
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 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
- 239000003619 algicide Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 150000003623 transition metal compounds Chemical class 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 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
- C02F5/14—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 phosphorus
- C02F5/145—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 phosphorus combined with inorganic substances
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
-
- 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
-
- 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
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the technical field of water treatment, and provides a softened water closed system corrosion inhibitor which comprises the following components in percentage by weight: 3-8 parts of hydroxypropyl acrylate copolymer, 5-10 parts of hydroxyethylidene diphosphonic acid, 3-5 parts of copper corrosion inhibitor, 1-5 parts of sodium tungstate, 2-8 parts of ammonium molybdate and 9-15 parts of deionized water. The corrosion inhibitor for the softened water closed system has the advantages that the principle components are good in cooperativity, the product performance is stable, the concentration rate of the softened water closed system is improved, and the corrosion problem in the system can be better controlled; the softened water tight closure system corrosion inhibitor prepared by the preparation method has better protection effect on the hanging piece, the corrosion rate can be controlled to be only 0.022mm/a, and the protection effect of the softened water tight closure system corrosion inhibitor prepared by the preparation method on the hanging piece is better than that of the conventional commercially available product.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a softened water closed system corrosion inhibitor and a preparation method thereof.
Background
With the continuous development of industrial production, water resources in China are more and more short, the proportion of industrial water in the total water consumption is gradually enlarged, and the circulating water accounts for more than 60% of the industrial water. In order to save water, many industrial enterprises continuously improve the concentration ratio of circulating water, and the concentration of calcium and magnesium plasma in the water is increased, so that the scaling of equipment and pipelines is more serious, the efficiency of heat exchange equipment is reduced, the circulating water flux area is reduced, the resistance is increased, the energy consumption is increased, and the production cost is increased.
Compared with common industrial circulating water, the softened water has the advantages of high concentration ratio and difficult scaling, but because no scale layer is used for protection, the water is in direct contact with the surfaces of equipment and pipelines, so that the corrosion speed of the equipment and the pipelines is accelerated, and therefore effective corrosion inhibition measures are required to be carried out in a softened water closed system to slow down the corrosion of the equipment and the pipelines.
At present, nitrite or a composite corrosion inhibitor containing nitrite is widely used for solving the problem of corrosion of a softened water closed system due to good slow release effect, but the nitrite has toxicity, and the later-stage discharge can cause environmental pollution, so that the application range of the nitrite or the composite corrosion inhibitor containing nitrite is greatly limited. Some researchers apply low-toxicity or non-toxicity compounds such as molybdate to the slow release of a softened water closed system, but when the molybdate is used alone as a corrosion inhibitor, the use cost is high, and the use amount is large.
Disclosure of Invention
In view of the above, the present invention aims to provide a corrosion inhibitor for a softened water closed system and a preparation method thereof, which have the advantages of good synergy of the components, stable product performance, improved concentration ratio of the softened water closed system, and better control of corrosion in the system.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a softened water closed system corrosion inhibitor which comprises the following components in percentage by weight: 3-8 parts of hydroxypropyl acrylate copolymer, 5-10 parts of hydroxyethylidene diphosphonic acid (HEDP), 3-5 parts of copper corrosion inhibitor, 1-5 parts of sodium tungstate, 2-8 parts of ammonium molybdate and 9-15 parts of deionized water.
Preferably, the softened water sealing system corrosion inhibitor comprises the following components in percentage by weight: 4-7 parts of hydroxypropyl acrylate copolymer, 6-9 parts of hydroxyethylidene diphosphonic acid (HEDP), 4 parts of copper corrosion inhibitor, 2-4 parts of sodium tungstate, 3-7 parts of ammonium molybdate and 10-14 parts of deionized water.
Preferably, the softened water sealing system corrosion inhibitor comprises the following components in percentage by weight: 6 parts of hydroxypropyl acrylate copolymer, 8 parts of hydroxyethylidene diphosphonic acid (HEDP), 4 parts of copper corrosion inhibitor, 3 parts of sodium tungstate, 5 parts of ammonium molybdate and 12 parts of deionized water.
The principle of action of the components of the invention is as follows:
in the raw materials, the selected hydroxypropyl acrylate copolymer has good inhibition effect on the formation and deposition of calcium carbonate, calcium sulfate, particularly calcium phosphate scale, and also has good dispersion performance on ferric oxide, sludge, clay and oil scale; can be used under the condition of high pH value; has good miscibility with organic phosphate, copper corrosion inhibitor and the like, has special effect on inhibiting zinc salt deposition and calcium phosphate scale precipitation, and has good scale inhibition and dispersion effects under higher temperature and alkaline conditions.
The hydroxyl ethylidene diphosphoric acid can form a stable complex with iron, copper, zinc and other metal ions, can dissolve oxides on the surface of metal, has a larger dissociation constant in water, can generate a stable complex with the metal ions, can form a stable addition compound with a compound containing active oxygen, and ensures that the active oxygen keeps stable, and is mainly used as a scale inhibitor and a corrosion inhibitor of boilers and heat exchangers, a complexing agent for cyanide-free electroplating, a chelating agent for soap, and a cleaning agent for metal and nonmetal.
The copper corrosion inhibitor can be adsorbed on the surface of metal to form a thin film to protect copper and other metals from being corroded by atmosphere and harmful media; the copper corrosion inhibitor can be used together with various scale inhibitors and sterilization algicide in a circulating water system, and has good corrosion inhibition effect on the circulating water system.
Sodium tungstate and sodium molybdate are transition metal compounds with extremely excellent physical and chemical properties, can be used for preventing metal corrosion in electroplating, and have a certain synergistic effect, so that the corrosion speed of carbon steel in seawater can be effectively relieved.
In the raw material components, when the weight ratio of the hydroxypropyl acrylate copolymer, the hydroxyethylidene diphosphate and the copper corrosion inhibitor is approximately 1: 2: 1, the weight ratio of sodium tungstate to ammonium molybdate is approximately 1: and 2, the corrosion rate effect of the corrosion inhibitor is optimal.
The raw material components have characteristics, and although the raw material components have the characteristics of dispersion and corrosion inhibition, the raw material components have different emphasis points, so that the defects of corrosion and deposition in treatment are overcome.
The preparation method of the softened water closed system corrosion inhibitor comprises the following steps:
sequentially and uniformly stirring one third of deionized water and ammonium molybdate, adding hydroxyethylidene diphosphonic acid, heating to 45-55 ℃, continuously stirring for 25-35min, and cooling to room temperature to obtain a polymer A;
adding one third of deionized water and sodium tungstate, stirring uniformly, heating to 40-50 ℃, adding a copper corrosion inhibitor, stirring for 25-35min until the copper corrosion inhibitor is completely dissolved, adding a hydroxypropyl acrylate copolymer, continuing stirring for 25-35min, cooling to room temperature, and continuing stirring for 55-65min to obtain a polymer B;
adding B into A, supplementing the rest deionized water, and stirring for 55-65min to obtain a uniform liquid.
Preferably, the speed of the stirring is 60-100 rpm;
the stirring speed has obvious influence on the polymerization reaction speed and the preparation yield of the copolymer of ammonium molybdate, hydroxyethylidene diphosphonic acid, sodium tungstate, a copper corrosion inhibitor and hydroxypropyl acrylate, and when the stirring speed is selected by the method, the preparation yield is higher; by adopting the stirring speed and the stirring time, the performance efficiency of the prepared corrosion inhibitor is ensured.
The softened water closed system corrosion inhibitor can be applied to softened water with the following water quality conditions: pH value of 5.5-7.5, hardness of 60-120mg/L, and electric conductance controlled at 1-10 μ s/cm.
Preferably, the addition amount of the softened water sealing system corrosion inhibitor is 10-50 mg/L.
Compared with the prior art, the invention has the beneficial effects that:
the corrosion inhibitor for the softened water closed system has good cooperativity of each principle component and stable product performance, improves the concentration ratio of the softened water closed system and can better control the corrosion problem in the system; the softened water tight closure system corrosion inhibitor prepared by the preparation method has better protection effect on the hanging piece, the corrosion rate can be controlled to be only 0.022mm/a, and the protection effect of the softened water tight closure system corrosion inhibitor prepared by the preparation method on the hanging piece is better than that of the conventional commercially available product.
Detailed Description
Exemplary embodiments will be described in detail herein. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and products consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. Embodiments of the present invention include, but are not limited to, the following examples.
Example 1
Adding 4 parts by weight of deionized water and 8 parts by weight of ammonium molybdate into a reaction kettle in sequence, uniformly stirring, adding 8 parts by weight of hydroxyethylidene diphosphonic acid, heating to 50 ℃, continuing stirring for 30min, and cooling to room temperature to obtain a polymer A; adding 4 parts of deionized water and 4 parts of sodium tungstate into a reaction kettle, uniformly stirring, heating to 45 ℃, adding 5 parts of copper corrosion inhibitor, stirring for 30min till complete dissolution, adding 8 parts of hydroxypropyl acrylate copolymer, continuously stirring for 30min, cooling to room temperature, and continuously stirring for 60min to obtain a polymer B; and adding B into A, adding 4 parts of deionized water, and fully stirring for 60min to obtain a uniform liquid, thus obtaining the softened water closed system corrosion inhibitor.
Example 2
Adding 5 parts by weight of deionized water and 8 parts by weight of ammonium molybdate into a reaction kettle in sequence, uniformly stirring, adding 10 parts by weight of hydroxyethylidene diphosphonic acid, heating to 50 ℃, continuing stirring for 30min, and cooling to room temperature to obtain a polymer A; adding 5 parts of deionized water and 5 parts of sodium tungstate into a reaction kettle, uniformly stirring, heating to 45 ℃, adding 4 parts of copper corrosion inhibitor, stirring for 30min until the copper corrosion inhibitor is completely dissolved, adding 3 parts of hydroxypropyl acrylate copolymer, continuously stirring for 30min, cooling to room temperature, and continuously stirring for 60min to obtain a polymer B; and adding the B into the A, adding 5 parts of deionized water, and fully stirring for 60min to obtain a uniform liquid, thus obtaining the softened water closed system corrosion inhibitor.
Example 3
Sequentially adding 3 parts by weight of deionized water and 2 parts by weight of ammonium molybdate into a reaction kettle, uniformly stirring, adding 5 parts by weight of hydroxyethylidene diphosphonic acid, heating to 50 ℃, continuously stirring for 30min, and cooling to room temperature to obtain a polymer A; adding 3 parts of deionized water and 1 part of sodium tungstate into a reaction kettle, uniformly stirring, heating to 45 ℃, adding 3 parts of copper corrosion inhibitor, stirring for 30min until the copper corrosion inhibitor is completely dissolved, adding 6 parts of hydroxypropyl acrylate copolymer, continuously stirring for 30min, cooling to room temperature, and continuously stirring for 60min to obtain a polymer B; and adding the B into the A, adding 3 parts of deionized water, and fully stirring for 60min to obtain a uniform liquid, thus obtaining the softened water closed system corrosion inhibitor.
Example 4
Adding 4 parts by weight of deionized water and 6 parts by weight of ammonium molybdate into a reaction kettle in sequence, uniformly stirring, adding 7 parts by weight of hydroxyethylidene diphosphonic acid, heating to 50 ℃, continuing stirring for 30min, and cooling to room temperature to obtain a polymer A; adding 4 parts of deionized water and 3 parts of sodium tungstate into a reaction kettle, uniformly stirring, heating to 45 ℃, adding 4 parts of copper corrosion inhibitor, stirring for 30min till complete dissolution, adding 4 parts of hydroxypropyl acrylate copolymer, continuously stirring for 30min, cooling to room temperature, and continuously stirring for 60min to obtain a polymer B; and adding B into A, adding 4 parts of deionized water, and fully stirring for 60min to obtain a uniform liquid, thus obtaining the softened water closed system corrosion inhibitor.
Example 5
Adding 5 parts by weight of deionized water and 7 parts by weight of ammonium molybdate into a reaction kettle in sequence, uniformly stirring, adding 9 parts by weight of hydroxyethylidene diphosphonic acid, heating to 50 ℃, continuing stirring for 30min, and cooling to room temperature to obtain a polymer A; adding 5 parts of deionized water and 2 parts of sodium tungstate into a reaction kettle, uniformly stirring, heating to 45 ℃, adding 3 parts of copper corrosion inhibitor, stirring for 30min until the copper corrosion inhibitor is completely dissolved, adding 7 parts of hydroxypropyl acrylate copolymer, continuously stirring for 30min, cooling to room temperature, and continuously stirring for 60min to obtain a polymer B; and adding the B into the A, adding 5 parts of deionized water, and fully stirring for 60min to obtain a uniform liquid, thus obtaining the softened water closed system corrosion inhibitor.
Comparative example 1
Commercial product 1TH-619 type corrosion and scale inhibitor
Comparative example 2
Commercial product 2TH-628 type corrosion and scale inhibitor
Test results
Product performance testing
The application of the softened water closed system corrosion inhibitor of the invention is as follows: directly treating in softened water with pH value of 5.5-7.5, hardness of 60-120mg/L and conductance controlled at 1-10 μ s/cm. 5 softened water systems are selected for corrosion rate evaluation experiments, the adding amount of the embodiments 1-5 is 50mg/L, and the experimental days are 60 days; the amount of the commercial product 1 and the commercial product 2 of comparative examples 1 and 2 was 60mg/L, and the number of days of the experiment was 70 days.
The test results are shown in table 1:
TABLE 1 test results
As can be seen from the results in Table 1, the corrosion inhibitors for the softened water closed system prepared in the examples 1-5 of the present invention have better corrosion rate protection effect on the coupon than the corrosion inhibitors prepared in the comparative examples 1 and 2, especially the corrosion inhibitors prepared in the example 4, and the corrosion rate is only 0.022 mm/a. And the comparison result shows that under the condition that the test conditions of the comparative examples 1 and 2 are relaxed, the dosage of the comparative example is 10mg/L more than that of the examples 1-5, and the experimental day is 10 days more than that of the examples 1-5, the protective effect of the softened water closed system corrosion inhibitor prepared by the embodiment of the invention on the hanging piece is still greatly better than that of the commercial product of the comparative example.
Comparing example 4 with examples 1, 2, 3 and 5, it can be seen that in the starting composition, when the weight ratio of hydroxypropyl acrylate copolymer, hydroxyethylidene diphosphate and copper corrosion inhibitor is approximately 1: 2: 1, the weight ratio of sodium tungstate to ammonium molybdate is approximately 1: and 2, the corrosion rate effect of the corrosion inhibitor is optimal.
In a word, the softened water closed system corrosion inhibitor provided by the embodiment of the invention has the advantages that the raw material components are good in cooperativity, the product performance is stable, and the corrosion problem existing in the system can be better controlled.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The softened water sealing system corrosion inhibitor is characterized by comprising the following components in percentage by weight: 3-8 parts of hydroxypropyl acrylate copolymer, 5-10 parts of hydroxyethylidene diphosphonic acid, 3-5 parts of copper corrosion inhibitor, 1-5 parts of sodium tungstate, 2-8 parts of ammonium molybdate and 9-15 parts of deionized water.
2. The softened water sealing system corrosion inhibitor of claim 1, comprising the following components in weight percent: 4-7 parts of hydroxypropyl acrylate copolymer, 6-9 parts of hydroxyethylidene diphosphonic acid, 4 parts of copper corrosion inhibitor, 2-4 parts of sodium tungstate, 3-7 parts of ammonium molybdate and 10-14 parts of deionized water.
3. The softened water sealing system corrosion inhibitor of claim 1, comprising the following components in weight percent: 6 parts of hydroxypropyl acrylate copolymer, 8 parts of hydroxyethylidene diphosphonic acid, 4 parts of copper corrosion inhibitor, 3 parts of sodium tungstate, 5 parts of ammonium molybdate and 12 parts of deionized water.
4. A method of preparing a demineralized water containment system corrosion inhibitor according to any of claims 1 to 3, characterized in that the method steps are as follows:
sequentially and uniformly stirring one third of deionized water and ammonium molybdate, adding hydroxyethylidene diphosphonic acid, heating to 45-55 ℃, continuously stirring for 25-35min, and cooling to room temperature to obtain a polymer A;
adding one third of deionized water and sodium tungstate, stirring uniformly, heating to 40-50 ℃, adding a copper corrosion inhibitor, stirring for 25-35min until the copper corrosion inhibitor is completely dissolved, adding a hydroxypropyl acrylate copolymer, continuing stirring for 25-35min, cooling to room temperature, and continuing stirring for 55-65min to obtain a polymer B;
adding B into A, supplementing the rest deionized water, and stirring for 55-65min to obtain a uniform liquid.
5. The method of claim 4, wherein the stirring speed is 60-100 rpm.
6. The use of a demineralized water closure system corrosion inhibitor according to any of claims 1 to 3, wherein said demineralized water closure system corrosion inhibitor is applied to demineralized water under water quality conditions: pH value of 5.5-7.5, hardness of 60-120mg/L, and electric conductance controlled at 1-10 μ s/cm.
7. The use of a demineralized water containment system corrosion inhibitor according to claim 6, characterised in that the amount of demineralized water containment system corrosion inhibitor added is 10-50 mg/L.
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