JPS60202111A - Isopropenylphosphonic acid copolymer and use - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to impropenylphosphonic acid copolymers and their uses.

More specifically, the present invention relates to impropenylphosphonic acid copolymers and the use of the copolymers to inhibit corrosion in water systems such as cooling systems, boiler systems, and gas scrubbing systems, and to form olivine. and a method for controlling the formation and deposition of such compounds.

Problems of corrosion, olivine formation and their attendant effects in water systems have been plaguing water systems for several years.

There is a tendency for olivine to deposit on the internal walls of various water systems, such as boiler systems and cooling systems, thereby substantially reducing the operating efficiency of the system.

Deposits in systems such as heat exchange equipment can occur for several reasons. For example, calcium carbonate, calcium sulfate, and calcium phosphate precipitate in the water system, leading to the agglomeration of these olivine-forming compounds along or around metal surfaces that come into contact with running water circulating through the system. . This manner severely inhibits the heat transfer function of a particular system.

On the other hand, corrosion is an electrochemical decomposition reaction between a metal and its environment. Simply stated, this is a return of a refined metal to its natural state. For example, iron ore is iron oxide. Refining iron oxide to obtain steel. When steel corrodes, this forms iron oxides which, if left untreated, degrade and destroy the metal and prevent certain water systems from functioning until necessary repairs are made. will be stopped.

Typically in cooling water systems, calcium sulfate, calcium phosphate, calcium carbonate, among others, have been previously recognized to be detrimental to the overall efficiency of the cooling water system. In recent years, the widespread use of cooling treatments that use high concentrations of orthophosphate to promote corrosion resistance on metal surfaces that come into contact with water systems has resulted in the retention of relatively high concentrations of orthophosphate in water systems, resulting in the crystallization of calcium phosphate. It has become very important to be able to suppress the crystallization of calcium phosphate to achieve the desired metal surface anti-corrosion treatment effect without blocking or interfering with the heat transfer function caused by.

Although steam generation systems are somewhat different from cooling water systems, they both share the usual problems with deposit formation.

Betz Hand-bo of Industrial Water Conditioning
OK of Industrial Water C:
8th edition (1980) Be
tz Laboratories, InclTrevo
SE, PA pages 95-96, the formation of olivine and residue deposits on the heating surfaces of boilers is an important problem encountered during steam generation. In modern industrial steam production systems, the water undergoes sophisticated external treatments (e.g. water condensation,
However, these treatments have only moderate effectiveness. External treatment provides a suitable escape method in itself, since in all cases some of the dross, residue, deposits and hardening ions that escape the treatment will eventually be introduced into the steam flow generation system. It's not a thing.

In addition to the problems caused by dross, residue or deposits, the industry has had to overcome olivine in boilers. Although attempts have been made to specifically remove calcium and magnesium from water supplies as external treatments, the formation of olivine (i.e. calcium and magnesium salts) due to residual hardness is always experienced. There is therefore a need for internal treatment (i.e. treatment of the water fed into the system) in order to prevent, reduce and/or delay the formation of compounds responsible for olivine formation and their deposition. Magnesium carbonate and calcium carbonate are not only the compounds of concern with olivine, but also the magnesium or calcium and possibly iron or copper ions present in the water or added for other purposes. It reacts with high concentrations of phosphate, sulfate and silicate ions, and is deposited as olivine in boilers. Granules deposited on the respective structural parts of the steam generation system impair the circulation and reduce the heat transfer capacity, thus resulting in a loss of overall efficiency.

According to the present invention, repeating unit component (a) and (
It has been found that copolymers (I) containing b) are surprisingly effective in controlling the formation of mineral deposits and inhibiting corrosion in mild irrigation systems.

on). ], a group selected from xy, amide, and a water-soluble salt thereof (preferably a hydroxylated (lower) alkyl having about 2 to 6 carbon atoms); - represents an alkyl having 1 to 3 carbon atoms or H; ] (The preferred repeating unit (b) based on experimental data is 2-hydroxypropyl acrylate.

).

A terpolymer consisting of two or more different components selected from the repeating unit (b) and a component selected from the repeating unit (a) is also included within the scope of the present invention.

In addition to the above two types of essential repeating units (ri and (b)), an optional third repeating unit (C) can be combined into the /returning bone of the copolymer.This third unit (e) is preferably a maleic acid or maleic anhydride moiety.

The phosphonic acid monomer corresponding to the one repeating unit (a) (the m1 monomer to be copolymerized with one or more monomers corresponding to the other repeating unit (b)) is It can be produced by a reaction mechanism that includes zero inclusive addition of phosphorus trichloride to the carbonyl group of acetone. For example, the reaction can proceed according to the following formula: In the above process, the relatively low cost of the precursor acetone allows the impropenylphosphonic acid monomer ( a) can be produced.

Further, as detailed in U.S. Pat. No. 2,365,466, the desired monomer (- ) can be manufactured.

Regarding monomer (b), hydroxyalkyl acrylates are preferred, and 2-hydroxypropyl acrylate is most preferred. These components can be easily produced by addition reaction of acrylic acid or a derivative or water-soluble salt thereof with a desired alkyl oxide derivative. For example, 2-hydroxypropyl acrylate can be produced by reacting acrylic acid and propylene oxide.

Regarding other possible monomers corresponding to repeat unit (b),
These are known compounds. For example, acrylic acid can be produced directly from ethylene cyanohydrin. Methacrylic acid can be produced from acetone cyanohydrin. Acrylamide monomers can also be obtained by treating acrylonitrile with sulfuric acid or hydrochloric acid.

Optionally a tertiary acid such as maleic acid or its anhydride
The terpolymer of the present invention can be produced using monomer (C).

After producing the desired monomer, copolymerization can be carried out by a stepwise reaction operation under bulk polymerization, suspension polymerization, emulsion polymerization, solution polymerization, or thermal polymerization conditions. For example, it can be carried out in an aqueous solution system using ammonium persulfate as an initiator. Other standard copolymerization reaction systems using initiators such as hyperenriched benzoyl, azobisisobutyronitrile or ferrous sulfate may also be employed. Standard chain inhibitors such as secondary alcohols (isopropanol), mercaptans, halohydrocarbons, etc. can be used to control the molecular weight of the copolymer.

The target copolymer (I) has a molar ratio of its components (a:b
) from about 3:l to about 0.5:l (most preferably about 2:l)
:l to l:l) is most advantageous. - The preferred copolymer based on the experimental data obtained at this point is isopropenylphosphonic acid/2-hydroxypropyl agrilate (molar ratio a:b, = 1:1).

The fact that polymers are formed according to the present invention is 31PM
R spectral analysis (approximately - indicating significant polymer formation)
A wide range of absorption from 20 to -40 ppm (relative to orthophosphoric acid) is known. ) is demonstrated by

The copolymers (I) of the invention are of course used in water systems when corrosion inhibiting and/or deposit inhibiting activity is desired in effective amounts compatible with these purposes. This amount depends on the particular system to be treated and is influenced by factors such as the surface area to be eroded, the pH temperature, the amount of water used, the respective concentration of potential olivine in the water and the type of deposit formed. receive. In most cases, it will be effective to use the copolymers of the present invention at concentrations of about 0.1 to 500 ppm, preferably about lθ to 20 ppm, based on the water contained in the equipment system to be treated. This copolymer may be used by continuously or intermittently adding a predetermined amount of the copolymer in the form of an aqueous solution directly into a desired water system.

The copolymers of the present invention are not limited to use in any particular class of water systems. For example, in addition to boilers and cooling water systems, the polymers of the present invention can be effectively used in cleaning systems where formation and deposition of salts that lead to corrosion and/or olivine formation are a problem. can. Other possible environments in which the polymers of the present invention can be used include heat distribution seawater desalination equipment and dust collection systems in the steel manufacturing industry.

The copolymers of the present invention can also be used in combination with other components to enhance their corrosion and olivine inhibiting properties. For example, the copolymer may be used in combination with one or more compounds selected from inorganic phosphoric acids, phosphonates, organic phosphoric esters, and polyvalent metal salts.

Examples of such inorganic phosphoric acids include concentrated phosphoric acids and water-soluble salts thereof. Phosphoric acids include orthophosphoric acid, primary phosphoric acid, and diphosphoric acid. Inorganic concentrated phosphoric acids include polyphosphoric acids such as birophosphoric acid, tripolyphosphoric acid, etc., metaphosphoric acids such as trimetaphosphoric acid and tetrametaphosphoric acid.

Regarding other phosphonic acid derivatives used in addition to the copolymers of the present invention, the aminopolyphosphonic class such as aminotrimethylenephosphonic acid, ethylenediaminetetramethylenephosphonic acid, etc., methylene diphosphonic acid, hydroxyethylidene-1,1 -diphosphonic acid, 2-phosphonobutane-1,2,4-)licarboxylic acid, and the like.

Examples of organic phosphate esters that can be used in conjunction with the polymers of the present invention include alkyl alcohol esters of phosphoric acid, ethyl phosphoric acid esters, etc.), methyl cellosolve or ethyl cellosolve esters of phosphoric acid, Examples include phosphoric acid esters of polyoxyalkylated polyhydroxy compounds obtained by adding ethylene oxide to polyhydroxy compounds such as hyclycerol, mannitol, and sorbitol. Other suitable organic phosphoric esters are phosphoric esters of amino alcohols such as mono-, di- or triethanolamine.

Inorganic phosphoric acids, phosphonic acids and organic phosphoric esters may be their salts, preferably alkali metal salts, ammonium salts, amine salts and the like.

Examples of polyvalent metal salts that can be used in combination with the copolymer (I) of the present invention include salts that are capable of dissociating polyvalent metal ions (for example, Zn+1, Ni++, etc.) in water. (including zinc chloride, zinc sulfate, nickel sulfate, nickel chloride, etc.).

The copolymer (I) of the present invention can be mixed with inorganic phosphoric acids, phosphonic acids, organic phosphoric esters or water-soluble salts thereof (
All of these are hereinafter referred to as phosphoric acid compounds. ) and polyvalent metal salts and added to the water system, a certain amount of copolymer (I) is separated and added to the water system in the form of an aqueous solution. I can do it. Copolymer (I) may be added continuously or intermittently. Alternatively, the copolymer (1) and the phosphoric acid compound or polyvalent metal salt may be mixed, and this may be added to the water system continuously or intermittently in the form of an aqueous solution. Phosphate compounds or polyvalent metal salts can be used in the usual manner for the purpose of preventing corrosion and olivine. For example, phosphoric acid compounds or polyvalent metal salts,
It can be added to the water system continuously or intermittently to maintain the required concentration.

Generally, phosphoric acid compounds are about 1 to 1 OOppm (PO4
or polyvalent metal salt in an amount of about 1 to 50 ppm
(as metal cations) in the water system.

As is commonly practiced, the phosphoric acid compound or polyvalent metal salt is used in its pre-processing dosage form in a dosage form of about 20 to 50 s o
After adding the ppm amount, a small amount can be added to the water system as a maintenance amount.

The copolymer (I) of the present invention is a conventional corrosion inhibitor, a conventional olivine and pollution inhibitor, a sequestering agent, a sequestering agent, and a metal ion sequestering agent that inhibits the corrosion of iron, steel, copper, copper alloys and other metals. It can be used in combination with other conventional water treatment agents. Corrosion inhibitors include chromates, dichromates, tungstates, molybdates, nitrites, borates, silicates, oxycarboxylic acids,
Examples include amino acids, catechols, aliphatic amino surfactants, benzotriazoles and mercaptobenzothiazoles. Other olivine and stain inhibitors include lignin derivatives, tannic acids, starch, sodium polyacrylate, polyacrylic acid amide, and the like. Sequestering agents include ethylenediamine, diethylenetriamine, and the like, and polyaminocarboxylic acids include trilotriacetic acid, ethylenediaminetetraacetic acid, and diethylenetriaminepentaacetic acid.

) is exemplified.

Next, the monomer and the method for producing the preferred copolymer of the present invention will be specifically explained with reference to Examples. The examples are only for illustrating and explaining typical manufacturing methods, and are not intended to limit the scope of the present invention.

Preparation of Isopropenyl/Phosphonic Acid Monomer Acetone 300F (5.2 moles) is added to a 3J three-necked flask equipped with a magnetic stirrer, thermometer, and pressure-compensated addition funnel. 30 phosphorus trichloride from the addition funnel! i! (5.3 mol) is added immediately. Addition produces a slight exotherm. After stirring the mixture for 4.5 hours, 1500 t/l of acetic acid are added and the flask is fitted with a reflux condenser. The mixture becomes cloudy and is refluxed so that a sufficient amount of hydrogen chloride is released. After stopping the reflux, hydrogen chloride gas is bubbled through the solution for 0.5 hours.

This mixture is stirred at room temperature overnight. Prepare the contents of the flask for distillation and bring it under atmospheric pressure to a temperature of 118°C.
Distill to remove volatile components. Attach a water aspirator and continue distilling until the pot temperature reaches 175°C. -w l mHf1 below 180-190
Remove residual volatiles at °C. The product is a viscous gold-yellow liquid, 571 g (9196).

After the mixture has cooled, add enough water to make a 50% solution. 13c of the aqueous product, MR is δ = 140.4, x
a2.7ppm (J=x72.1Hz): 129.9
．． 129.5PPm (J = 9.8 Hz):
19.4.18.9 ppm (J = 13.48Z)
Shows three double lines.

The 31 PMR spectrum shows a single peak at δ=-19,0 PPm. Traces of inorganic Linnean obtuse are present.

Example 1 Preparation of isopropenylphosphonic acid/hydroxypropyl acrylate copolymer (molar ratio 1:l) 500-resin equipped with knee, mechanical stirrer, thermometer, pressure-compensated addition funnel and reflux condenser Kamani.

Hydroxypropyl acrylate (26,6 $1.0.2
Insert the mole). Impropenylphosphonic acid (25,4
F, 0.2 mol) was dissolved in 154.25' of water, and the element was 0.
．． Infuse for 5 hours. Ammonium Persulfate 61 Add this quickly to the kettle. Add nitrogen to the mixture and continue the nitrogen injection for an additional 0.5 hour. The mixture □□ Ba ( ) is heated under reflux for 2 hours. After addition of 61 more ammonium persulfates, the mixture is refluxed for 2 hours. After the second addition of ammonium persulfate, the viscosity increases noticeably. The yellow product is pHl, QQ and carry out the following tests without further purification. The 31 PMR spectrum shows broad polymeric absorption centers δ = 32.9 and -34,7 ppm and a small amount of monomer δ = -19,0 ppm. show.

Example 2 Preparation of impropenylphosphonic acid/hydroxypropyl acrylate copolymer (molar ratio 1:l) Before adding the aqueous solution of impropenylphosphonic acid to the reaction kettle, the pH was 2.
,5. The amount of ammonium persulfate is 2.5fX
The amount was reduced twice and treated in the same manner as in Example 1 to obtain a copolymer. The yellow-brown solution has a pH of 1 2,55. The PMR spectrum shows polymer absorption centers δ = -33,1, -31,0, -27,5 and -
It shows 24,7PPm. There is no evidence of the presence of phosphorus-containing monomers.

Example 3 Preparation of isopropenylphosphonic acid/hydroxypropyl acrylate copolymer (molar ratio 1:l) The volume of the isopropenylphosphonic acid solution was adjusted to 4.0 before the knee polymerization treatment, and the same as in Example 2 was carried out. A copolymer product was obtained.

The yellow aqueous product has a final voice of 3.67. 31F
MR spectra show polymer absorption centers -28,9 and -2
It shows 2.9 ppm. Trace amounts of inorganic phosphate are present.

Example 4 Production of impropenylphosphonic acid/hydroxypropyl acrylate copolymer (mole ratio 3:l) Using the same polymerization apparatus as in Example 1, hydroxypropyl acrylate 1
7. IP (0.13 mol) and 49.8 f (0.41 mol) of impropenylphosphonic acid are mixed with 20.2 mol of water. s f
(In PI (2,5 scum), heat and reflux with 6 da of ammonium persulfate. After refluxing for 2 hours, initiator 61 is further added and refluxing for 2 hours.

The final pH of the brown solution is 2.7. 31FM of product
The R spectrum shows polymer absorption of -30 to 33 ppm and -
It has 24 ppm.

Example 5 Preparation of impropenylphosphonic acid/hydroxypropyl acrylate copolymer (2:l molar ratio) Impropenylphosphonic acid (61,6F, 54%, 0 .27 mol), hydroxypropyl acrylate (16,6F, 0.13 mol) and 121.8y of water are charged to the reactor. After adding 6fI of ammonium persulfate and refluxing for 1.5 hours, further adding 6y of ammonium persulfate and refluxing for 1.5 hours. The final value of the yellow solution is 0.72.

Example 6 Preparation of impropenylphosphonic acid/hydroxypropyl acrylate copolymer (molar ratio 0.5:l) - Impropenylphosphonic acid (30.7F, 54%, 0.5:l)
14 mol), hydroxypropyl acrylate (36,4
f, 0.28 mol) and 144.9 F of water are placed in a reaction vessel and treated similarly to the method of Example 5.

The polymer crystallizes within the first reflux period. It was found to be insoluble in water.

Examples Finpropenylphosphonic acid/acrylamide copolymer (
In a resin kettle similar to the above, aqueous impropenylphosphonic acid (479,54s, 0.2 mol) and aqueous acrylamide (28y, 50s, 0.2 mol) are mixed at a molar ratio of 1:1. Add 6y of ammonium persulfate and further 841ml of water. This solution is sparged with nitrogen for 0.5 hour and heated to reflux. After 1.5 hours, additional initiator 61 was added and the mixture was refluxed for 1.5 hours. The aqueous product is yellow, final grade 1 1.3. PMR is polymer absorption δ=-30,2 ~
−33.7 ppm and −25 to −29 ppm are shown.

Example 8 Production of impropenylphosphonic acid/hydroxyethyl methacrylate copolymer (molar ratio 3:l) In a resin pot,
Aqueous impropenylphosphonic acid (71F, 54%, 0.
3 mol) and hydroxyethyl methacrylate (13F
, 0.1 mol) is mixed with 121.6 F of water. After adding ammonium persulfate 6y and refluxing for 1.5 hours, further add initiator 6y and refluxing for 1.5 hours. The final product is -0
, 68 is a yellow solution. 31FMR has polymer absorption centers δ=-29.5 and -24.3 ppm.

Example 9 Impropenylphosphonic acid/hydroxypropyl acrylate/acrylic acid terpolymer (molar ratio 4:4:l)
Preparation of aqueous impropenylphosphonic acid (47fI, 54%, Q, 2 mol), hydroxypropyl acrylate (26y, 0.2 mol) and maleic anhydride (5f110.05) in a resin kettle under a nitrogen atmosphere. mole, water 50 mj
Mix medium terf (5 ICM sections) with 82.6 f of water.

Add 6 grams of ammonium persulfate and reflux for 1.5 hours.

Furthermore, the same amount of initiator as above is added and reflux is repeated for the same time. The final product is yellow with a pH of 99. 31
FMR shows polymer absorption centers δ = -34, -32,3 and -28,8 ppm.

Example 10 Preparation of 15:5:3) aqueous impropenylphosphonic acid (71F, 54%, 0.
3 mol), hydroxypropyl acrylate (13F, 0
．． 1 mole) Yakuyo and methyl acrylate (51!, 0.0
6-v-ru)wo, 1fHjfEW1. ammonium 61
Mix with water containing 121.6F. After injecting nitrogen for 0.5 h, the mixture is heated to reflux for 1.5 h. Furthermore, initiator 61 is added and refluxed for the same time. The final product is 1f(
It has 0.65. ``PMR is a significant polymer absorption-32
,4 and -24,3 ppm.

Example 11: Made by 1) (7). 2-' Aqueous impropenylphosphophone ff1 (47F, 54%,
0.2 mol), hydroxypropyl acrylate <26f
.
2.6f is mixed and polymerized. The final product is μm, o
It has 8.

Example 12 To evaluate the effectiveness of isopropenylphosphonic acid/2-hydroxypropyl acrylate copolymer (product of Example 1) as a corrosion inhibitor and deposition inhibitor for cooling water systems, this copolymer was Recirculat usually
The test was performed according to a procedure called Te5t. According to this test, mild steel corrosion test coupons and Admiralty corrosion test coupons are cleaned, weighed, and placed on a rotating holder in a simulated cooling water bath placed in a 17/glass. The temperature of the system is maintained at about 120 degrees Fahrenheit and the rotational speed of the coupon holder is adjusted to provide a water flow rate of about 1.3 feet per second passing the coupon.

A portion of the coupon is pre-treated with zinc polyphosphate,
Remaining coupons are not treated as such.

This water system has a fixed composition of fresh water, chemicals and blowdown. The presence of heat transfer tubes within the system allows for the study of the consequences of corrosion and olivine on heat transfer surfaces. One end of the heat transfer tube is pretreated in a manner similar to the coupon pretreatment.

Corrosion rate is determined by measuring weight loss.

At the end of the day, one mild steel coupon, one pretreated mild steel coupon, and an Admiralty coupon are removed from the bath and each weighed a second time. At the end of the test run, the remaining coupons are removed, cleaned, and weighed.

Calculate the corrosion rate of this coupon by differential weight loss according to the following equation:

(where N=5 or 7) The simulated cooling water is prepared to give the following conditions: Ca + 2600 PPm as calcium carbonate: Mg + 2300 PPm as magnesium carbonate: total phosphates aoppm; total inorganic phosphates 18PPm; orthophosphate. Ill2PPm: pH==7.
Q.

A pretreatment step of the strains at a copolymer strength of 25 ppm (activity) is carried out on the first day of the test. On the first day of pretreatment of this system, the copolymer concentration was determined by lOpp for residual testing.
m (active).

Test Results: Average corrosion rates for mild steel coupons and Admiralty coupons are highly acceptable t, smpy and Q, respectively.
3mP)'. A blue-black film of unknown composition is formed on the mild steel coupon and on the non-presaturated end of the heat transfer tube.

By neglecting the copolymer concentration of 25 ppm, the system water completely prevents clear ate precipitation. This observation is supported by both physical and chemical analysis. The water usage of this system is 0
, 211m, and chemical analysis of the phosphate shows no loss of orthophosphate. At treatment concentrations of this copolymer, it forms a black, strongly sticky film on the heat transfer surface. It is incredible that this film significantly reduces heat transfer.

Example 14 Another method for evaluating the deposition-inhibiting activity of a substance consists of measuring its ability to prevent mass phase precipitation of salts under conditions in which salts normally precipitate.

It is further important to recognize that the substance being evaluated is tested at substoichiometric concentrations. Thus typical molar ratios of precipitated cation to substance to be evaluated are 20:l and much higher.

Therefore, isolating stoichiometry is not a route to preventing multiphase precipitation. This well-known fact is thresholding (
Threshold treatments are widely practiced in water treatment technology for preventing olivine (salt) precipitation from forming on various surfaces. In the following test results, calcium phosphate, which is commonly found in industrial water systems under various conditions, is chosen as the precipitant. The performance of the copolymers of the present invention in preventing precipitation of this salt (ie, inhibiting crystallization) is evaluated. The results are expressed as inhibition rate, and positive values indicate inhibition of precipitate formation. Except where stated to the contrary, the following conditions, solutions, and test methods were applied to calcium phosphate.

Show the test results to your partner.

Calcium phosphate suppression method conditions: 1270°C: p) IQ, 5: l 7 hours equilibration; C
Il+2#2250ppm (calcium carbonate removed, r)
: PO+-3=6PP.

Solution 2 36.76 C: aC/2-2H20/7DIH200
, 4482PNλ2HPO, //DIH20 Test method: (1) Approximately 1800 rnt of DI water in a 2/vol flask;
Calcium chloride dihydrate 20-1 and then 2 drops of concentrated hydrochloric acid are added.

(2) Add m*40mt of disodium hydrogen phosphate.

(3) Make up to 2E volume with DI water.

(Pour one portion of the 41s solution into a 4-ounce glass jar.

(5) Addition treatment.

(6) Adjust μI as desired.

Place on +71700C water bath and equilibrate for 17 hours.

(8) Take out the sample and pass it through 0.2 μP while heating.

(9) Cool to room temperature, and
Absorbance is measured using Qnm).

Preparation for the Rife Photometer: All 5-ml solution, 10 m of molybdate reagent/10 m of C1 stannous reagent, vortex for 1 minute, pour into Rife photometer cuvette, wait 1 minute, then read. Record.

+1 [) current calibration curve
ation curve.

Find po473 (ppm) of each sample using POPO4-3 (absorbance for PP).

Calculation formula: % formula % () In Table 1, ◎ = Indicated by the number of the example for producing the copolymer = IPPA containing some initiator and unreacted monomer - Impropenyl phosphonate HPA = Hydroxypropyl acrylate As described above, the main features of the present invention have been described in detail with respect to various aspects thereof, but it goes without saying that the present invention is limited to the detailed description within the scope of its technical idea and technical scope. Without limitation, various modifications may be made as long as they are within the scope of the claims.

Patent Applicant: Pez International, Inc.

Claims (1)

[Claims] [In the formula, X=OH or 0M1M represents a cation. ] A substance containing a water-soluble copolymer containing a repeating moiety (b) represented by alkyl, R1 representing hydroxy, hydroxylated alkoxy, amide, or a water-soluble salt thereof. 2. The substance according to item 1, further comprising an fJ3 repeating unit component (C) selected from maleic acid or maleic anhydride. 3. The substance according to item 1, wherein the molar ratio a:b of each component is about l=1 to 3:l. 4. The substance according to item 1, wherein the copolymer contains at least two different repeating unit components (b). s, R2 = H, R1 = hydroxylated alkoxy. 6. The substance according to claim 5, wherein 6°R1 = 2-hydroxypropyl. 7. The substance according to item 1, wherein R = = C; Ha, R1 = hydroxylated alkoxy. 8. The substance according to item 7, wherein R1 = hydroxyethyl. 9. The substance according to item 1, where R2 = H, R, = N l (2). 10. The substance according to item 1, in which one of the components (b) contains acrylic acid.
Substances listed in section. 11. The substance according to paragraph 4, wherein one of the components (b) comprises a hydroxylated alkyl methacrylate. 12. The substance according to item 4, wherein one of the components (h) contains methyl acrylate. 13. Further selected from inorganic phosphoric acids and their water-soluble salts, phosphonic acids and their water-soluble salts, organic phosphoric acid esters and their water-soluble salts, and polyvalent metal salts that can be dissociated into polyvalent metal ions in water. 14. The inorganic phosphoric acids (n) include orthophosphoric acid, monophosphoric acid, diphosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, trimetaphosphoric acid, and tetramethaline. The substance according to item 13, which is selected from acids and water-soluble salts thereof. 5. Phosphon ill (n) is ethylenediaminetetramethylenephosphonic acid, methylene diphosphonic acid, hydroxyethylidene-1,l-diphosphonic acid and 13. The substance according to item 13, which is selected from 2-phosphonobutane-1,2,4-tricarboxylic acid. Substance according to item 13. 17. Under deposit-forming conditions, on the surface of a structural part of the equipment system exposed to an aqueous medium containing a precipitate that is the source of the formation of the surface. A method for suppressing precipitation of a precipitate, the method comprising:
M and M represent cations. [In the formula, - is H or lower alkyl having about 1 to 3 carbon atoms,
represents hydroxy, hydroxylated alkoxy, amide, or a water-soluble salt thereof. ] A method for suppressing olivine comprising adding an effective amount for the above-mentioned suppressing purpose of a water-soluble copolymer (1) containing a repeating unit component (b) shown in the following. 18. Copolymer (1) is added to an aqueous medium at a concentration of about 0.0% of the aqueous medium.
18. The method of claim 17, wherein the method is additionally used in an amount of 1 to 500 ppm. 19. The method according to item 18, wherein the device system is a steam generator system. 4.20. 19. The method according to item 18, wherein the device system is a cooling water device system. 21. The method according to item 18, wherein the device system is a gas cleaning device system. 22, the 17th compound in which - in the repeating unit component (b) is hydroxylated alkoxy, and the number in the repeating unit component (b) is H
The method described in section. 23. The method according to item 22, wherein the repeating unit component is heka-2-hydroxypropyl. 24. Compounds selected from inorganic phosphoric acids and their water-soluble salts, phosphonic acids and their water-soluble salts, organic phosphoric acid esters and their water-soluble salts, and polyvalent metal salts that can be dissociated into polyvalent metal ions in water. 18. The method of claim 17, wherein an effective amount of (n) for use in the device system is further used in the device system. 25, inorganic phosphoric acid (n) is orthophosphoric acid, primary phosphoric acid,
25. The method according to claim 24, wherein the method is selected from diphosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, and water-soluble salts thereof. 26. No. 24, wherein the phosphonic acid (Tl) is selected from ethylenediaminetetramethylenephosphonic acid, methylene diphosphonic acid, hydroxyethylidene-1,1-diphosphonic acid and 2-phosphonobutane-1,2,4-)licarboxylic acid The method described in section. 27. The method according to item 24, wherein the polyvalent metal salt is selected from zinc chloride, nickel chloride, zinc sulfate and nickel sulfate. 28, Compound (II) is added to the device system about 20 to 5 Q Q
Item 24, wherein X=OH or OM, 1lfll represents a cation. ] The repeating unit component (rito [wherein - is H or lower alkyl having about 1 to 3 carbon atoms,
- represents hydroxy, hydroxylated alkoxy, amide or a water-soluble salt thereof. A method for suppressing corrosion of metal parts of a irrigation equipment system, which comprises adding to the equipment system an effective amount of a water-soluble copolymer [I] containing the repeating unit component (b) shown in 6.30. Polymer (I) in an aqueous medium of about 0.1 to 500
30. The method of claim 29, wherein the method is used in addition to the aqueous medium in an amount of ppm. 31. The method according to item 30, wherein the device system is a steam generator system. 32. The method according to item 30, wherein the device system is a cooling water device system. 33. The method according to item 30, wherein the device system is a gas cleaning device system. 34. The method according to item 29, wherein the hexahydroxylated alkoxy in the repeating unit component (b) is H, and - in the unit component (b) is H. 35. The method according to item 34, wherein the repeating unit component (b) is heka-2-hydroxypropyl. 36. Selected from inorganic phosphoric acids and their explosive salts, phosphonic acids and their water-soluble salts, organic phosphoric acid esters and their water-soluble salts, and polyvalent metal salts that can be dissociated into polyvalent metal ions in water. A second compound (effective amount for the purpose of the device system) is used in addition to the device system.
The method described in Section 9. 37. Item 36, wherein the inorganic phosphoric acid (II) is selected from orthophosphoric acid, primary phosphoric acid, diphosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, and water-soluble salts thereof. the method of. 38, phosphonic acid (36) selected from ethylenediaminetetramethylenephosphonic acid, methylene diphosphonic acid, hydroxyethylidene-1,1-diphosphonic acid and 2-phosphonobutane-1,2,4-)licarboxylic acid; The method described in section. 39. The method according to item 36, wherein the polyvalent metal salt is selected from zinc chloride, nickel chloride, zinc sulfate and nickel sulfate. 40, compound (II), about 20 to 500P of the device system
37. The method of claim 36, wherein the method is used in addition to said system of devices in an amount of Pm.