JP2002080820A - Corrosion-resistant flow accelerator for cold and hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion-resistant flow accelerator for cold and hot water for cold and hot water air-conditioning systems which has an excellent flow-accelerating action, an energy-saving effect and a maintenance-improving effect while showing an anticorrosive effect. SOLUTION: The corrosion-resistant flow accelerator for cold and hot water is prepared by adding an anticorrosive containing a molybdate or a nitrite to a flow accelerator for fluids [e.g. a surfactant containing a component of formula I R1 is an oleyl group; R2 is a methyl group; X is an integer of 2; Y is an integer of 2; and A is chlorine or bromine)] and mixing these.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cold / hot water additive having a flow promoting action for a fluid and also having a corrosion inhibiting action, that is, a corrosion inhibiting flow promoting agent for cold / hot water and a heating medium for corrosion inhibiting cold / hot water. About. In particular, the present invention is characterized in that cold and hot water to which a surfactant that forms rod-shaped micelles is added and a rust preventive agent that does not adversely affect it is added is allowed to flow through the cooling medium transfer pipe and the radiator. Provided are a corrosion-inhibiting flow promoter for cold / hot water and a heat medium for corrosion-inhibiting cold / hot water, which is an energy-saving type, can be used on a real machine, and has a corrosion prevention function.

[0002]

2. Description of the Related Art Fluids flowing through pipes such as pipes include:
It is known that frictional resistance generated at the boundary between the fluids and the boundary between the fluid and the wall surface of the pipe and turbulent flow due to the resistance occur, whereby a force acts against the flow of the fluid in the pipe, By adding a small amount of a specific substance to such a fluid, the flow of the fluid in the pipe can be made smoother or the force against the flow of the fluid in the pipe can be reduced. Are known. Substances having such an effect are referred to in the art for fluids in pipes, such as “flow promoters”, “drag reducing agents”, “frictional drag reducing agents”, and “DR agents”. Air conditioning equipment is indispensable in office buildings, factories, hospitals, department stores, hotels, public facilities, etc. For such air conditioning, a heat medium transfer system for cooling and heating is used. In such a heat medium transfer system, the length of the pipe is usually long, the resistance in the pipe applied to the fluid flowing in the pipe is large, and the fluid transfer power also needs to be large.
Piping equipment costs will also be enormous. Furthermore, running costs also increase.

[0003] As an advantageous method of reducing equipment costs and reducing fluid conveyance power, it has been proposed to use a "flow promoter" for reducing the pipe resistance of a fluid such as water flowing in the pipe. Examples of such a device include, for example, JP-A-56-28262 and JP-A-60-9.
No. 9199, JP-A-60-152448, JP-A-8-231941, JP-B-4-6231, JP-B5-47534, U.S. Pat.
1,639, JP-A-8-311431,
JP-A-9-87610, JP-A-9-302324
JP-A-9-302375, JP-A-10-375
JP 183099, JP-A-10-183100, JP-A-10-183101, JP-A-10-1
JP-A-95476, JP-A-11-29758, JP-A-11-61093, JP-A-11-19337
No. 3, JP-A-11-241059, JP-A-11-241059
JP-A-1-344295, JP-A-2000-73086 and the like can be mentioned.

[0004] By the way, the cold and hot water pipes of the air conditioning equipment and the like, if water management is not performed by using a rust preventive or the like, rust or the like is generated in the pipes, and the inside of the pipes is closed or the pipes themselves are damaged. Since there is a possibility of causing trouble, various rust prevention and management means have been conventionally taken. Especially in large-scale air-conditioning facilities (for example, district heating and cooling, high-rise building air-conditioning, etc.) and air-conditioning facilities in semiconductor factories, it is important to extend the life of piping, and corrosion inhibitors are often used for such purposes. It is a fact. It is said that nitrite-based rust preventives are often used as rust preventives in a closed cold / hot water path.

[0005]

However, as described above, in recent years, attention has been paid to a means for conserving energy by distributing cold / hot water containing a surfactant for forming rod-shaped micelles into a cooling / heating medium transfer pipe and a radiator. The use of such flow promoters is mainly based on cationic surfactants, and therefore, when applied to air conditioning systems, the effect of suppressing corrosion is usually sufficient. Can not expect. That is, the conventionally known flow promoter has a low rust-preventing function, and practically, measures for rust-prevention have been considered as a problem.
When the flow promoter is used alone, corrosion in the pipe is expected to be unavoidable, and rust or the like may cause the wall surface of the pipe to become uneven. It is conceivable that the flow is disturbed by the unevenness generated on the inner wall of the pipe, the frictional resistance between the fluid flowing in the pipe and the pipe wall increases, and the flow rate decreases.

In order to reduce the flow resistance of the fluid flowing in the pipe, it is considered that one of the keys is that the flow promoter added to the heat medium forms rod-like micelles. Rust and the like are one of the major factors that hinder flow resistance reduction. In addition, in old facilities, rust is generated inside the piping. If the inside of such a rusted pipe is simply passed through a heat medium using a flow promoter consisting of a cationic surfactant and a counter ionic agent, the inside of the pipe will rust and the surface area inside will increase. As a result, more flow promoter is adsorbed inside the pipe, and a sufficient concentration cannot be secured. As a result, the effect as the flow promoter is not maintained.

[0007] With respect to this flow promoter, simply by selecting and using any corrosion inhibitor, the flow promotion function cannot be achieved. In addition, the conditions inside the piping of the air conditioning equipment are very varied, and the old facilities have the above-mentioned problems, and the flow promotion function is maintained simply by simply using a corrosion inhibitor in combination with the flow promoter. Is difficult in an actual air conditioning system, and it is difficult to exert its effect.
In other words, if measures are taken to adsorb the flow promoter in old facilities, etc., and if the countermeasures for decreasing the flow promoter concentration (decreasing the flow promotion function) are not taken, the cationic surfactant and the counter ion (salicylate) will be used. Etc.) is not sufficient as a corrosion suppression function only by the flow promotion function, and it is used in a closed system for a long period of time, and the drag of cold and hot water, which is a heat medium in a cold and hot water type air conditioning system, is reduced. It is difficult to maintain. Under these circumstances, there is a strong demand for the development of technologies that are energy-saving and that take into account the system and the environment.

[0008]

Means for Solving the Problems The present inventors have reduced the resistance of cold and hot water as a heat medium in a cold and hot water type air-conditioning system capable of handling cooling and heating, and can use it in a closed system for a long time. Various studies have been conducted to develop a method, and a flow promoter for a fluid, particularly preferably an N, N-bis (terminal hydroxy-substituted alkylene) -higher alkyl or higher alkenyl-substituted ammonium salt and a salicylate as a counter ion thereof, When a molybdate such as sodium molybdate or a nitrite such as sodium nitrite is added to cold and hot water, the drag of the cold and hot water in the transfer pipe is significantly reduced, and in addition, a corrosion suppressing effect can be obtained, thereby saving energy. The inventor has found that it is possible to improve the durability of the device together with the effect, and has completed the present invention. Also, in order to cope with the case where copper is used for the piping of the air conditioning system, a small amount of a benzotriazole (BTA) -based compound is added in order to strengthen the rust prevention of copper, and iron and copper are simultaneously added. We succeeded in controlling corrosion and promoting flow.

[0009] Other objects, features, advantages and aspects of the present invention will be apparent to those skilled in the art from the following description. However, it is understood that the description of the present specification, including the following description and the description of the specific examples, shows preferred embodiments of the present invention, and is given only for explanation. I want to. Various changes and / or alterations (or modifications) within the spirit and scope of the present invention disclosed herein will be apparent to those skilled in the art based on the following description and knowledge from other portions of the present specification. Will be readily apparent. All patents and references cited herein are cited for explanatory purposes, which are to be construed as being incorporated herein by reference. is there.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, in a cold / hot water type air conditioning system, a corrosion inhibiting flow promoter containing a fluid flow promoter and a rust inhibitor containing molybdate or nitrite is used. Energy-saving cold and hot water characterized by flowing cold and hot water added, particularly cold and hot water added with a surfactant that forms rod-shaped micelles and molybdate or nitrite, in a cooling medium transfer pipe and a radiator. An air conditioning method and an apparatus therefor are provided. An object of the present invention is to transfer heat with a low pump power in a heat medium transfer section (heat medium transfer section) from a cold / hot water generation point to a heat radiation point, thereby greatly reducing required power such as a pump,
It is an object of the present invention to improve the efficiency of a system device for a large area, to have no problem even in long-term use, and to significantly reduce maintenance.

In the present specification, the term "flow promoter for fluid" refers to
Refers to a substance or composition having a function of making the flow of the fluid in the pipe smoother or reducing the force against the flow of the fluid in the pipe, and may be selected from known substances. Preferred are those containing a surfactant as a component, and more preferred are those containing at least a surfactant and a counter ionic agent. The surfactant can be selected from those known to those skilled in the art as a cationic surfactant, and particularly preferably includes a surfactant that forms rod-shaped micelles in a fluid. :

[0012]

Embedded image

(Wherein R1 is an alkyl group having 12 to 26 carbon atoms or an alkenyl group having 12 to 26 carbon atoms;
2 is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms substituted with a hydroxy group;
Y is an integer of 1 to 4, and A represents an anion. ). More preferably, the following formula:

[0014]

Embedded image

Wherein R1 is an oleyl group, R2 is a methyl group, X is an integer of 2, Y is an integer of 2, and A represents chlorine or bromine. The counter ion agent is preferably a salicylate, and particularly preferably a salicylate sodium salt or a potassium salicylate salt. Thus, preferred fluid flow promoters include:

[0016]

Embedded image

(Wherein R1 is an alkyl group having 12 to 26 carbon atoms or an alkenyl group having 12 to 26 carbon atoms;
2 is an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms substituted with a hydroxy group;
Wherein Y is an integer of 1 to 4, A represents a halogen, for example, an anion such as chlorine or bromine, B represents a salicylate,
For example, it represents an alkali metal salt of salicylic acid. However, the ammonium salt component and the salicylate component may be in any ratio. ). More preferred fluid flow promoters are

[0018]

Embedded image

Wherein R1 is an alkenyl group having 16 to 20 carbon atoms, R2 is an alkyl group having 1 to 2 carbon atoms, X is an integer of 1 to 2, Y is an integer of 1 to 2 , A represents a halogen such as chlorine, bromine, etc., and B represents an alkali metal salicylate such as sodium salicylate, potassium salicylate, etc. However, the ammonium salt component and the salicylate component may be in any ratio.) It contains. Particularly preferably, the fluid flow promoter is

[0020]

Embedded image (Wherein, R1 is an oleyl group, R2 is a methyl group, X is an integer of 2, Y is an integer of 2, A represents a halogen such as chlorine or bromine, B is sodium salicylate or potassium salicylate. Salt, etc., provided that the ammonium salt component and the salicylate component may be in any ratio.).

The fluid flow promoter may be, for example, (1) sodium salicylate or potassium salicylate;
(2) It contains at least oleylbishydroxyethylmethylammonium chloride. In the above formula, B is a counter ion component, and the other portion is a surfactant component. As the surfactant component of the fluid flow promoter, for example, oleylbishydroxyethylmethylammonium chloride (“Ethocard (Eth.
O / 12 ", commercially available as an antistatic agent, and the like, and examples of the counter ion component include sodium salicylate. Fluid flow promoters include:
An antifoaming agent or the like can be added. As an antifoaming agent,
For example, commercially available products can be used, but not limited to these.

In the typical cold / hot water type air conditioning system of the present invention, the diameter between the heat source point and the heat radiation point is about 5-1000.
mm, preferably about 10-500 mm, the liquid temperature is about 1-90 ° C., preferably about 2-70 ° C., and the flow promoter for fluid is about 50-3000 ppm, preferably about 100-1200 ppm. That is, each of the ammonium ion component and the salicylate component is about 50 to 3
000 ppm, preferably about 100 to 1200 ppm, and further containing a molybdate or nitrite-containing rust inhibitor in cold and hot water at a wall shear rate of about 450 to
40,000γ (1 / s), preferably about 500-3
It is characterized by being distributed at 5,000γ (1 / s).

The diameter of the transfer pipe of cold and hot water as a heat medium is preferably about 5 to 1000 mm, more preferably about 10 to 1000 mm.
If it is smaller than this range, the water supply capacity of the heat medium becomes insufficient and it becomes difficult to supply a sufficient heat medium,
Further, if it exceeds this range, there is a problem that the piping cost becomes too high. The ammonium ion component (surfactant component), which is the flow promoter for fluids of the present invention, contains about 5
0 to 3000 ppm, preferably about 100 to 1200 p
pm can be contained, and if less than this range,
The drag reduction effect becomes unsatisfactory, and even if it exceeds this range, the cost increase due to an increase in the amount of use of the drag reduction effect is a problem. The flow of cold and hot water as a heat medium in the transfer pipe is performed at a wall shear rate of about 450 to 40,000γ.
(1 / s), preferably about 500 to 35,000γ (1
/ S), but by doing so, not only the drag reduction effect of the heat medium is improved but also the heat energy loss of the heat medium can be prevented. If the temperature is lower than this range, the effect is low, and the heat energy of the heat medium during transfer is low.
The problem of loss occurs. In addition, when the temperature exceeds this range, the heat energy loss of the heat medium rapidly increases. On the other hand, when it is desired to radiate heat from the heating medium hot water, if the pipe diameter is 5 to 20 mm at a heat radiation point (for example, a heater part of a general household), 1,
Wall shear rate less than 000γ (1 / s) or 40,0
It should be noted that, when the film is passed at a wall shear rate exceeding 00γ (1 / s), the heat energy loss of the heat medium increases, and as a result, the heat dissipation effect increases and the heater becomes excellent. .

The molybdate can be selected from those known to be used as rust inhibitors and those commercially available. Preferably, for example, sodium molybdate, potassium molybdate, molybdenum Examples thereof include lithium acid salts, calcium molybdate salts, ammonium molybdate salts and the like, and particularly preferably sodium molybdate or lithium molybdate. Examples of the nitrite include sodium nitrite, potassium nitrite, and lithium nitrite. The corrosion inhibiting flow promoter of the present invention may further contain a benzotriazole-based corrosion inhibitor. The benzotriazole-based corrosion inhibitor can be selected from those known to be used mainly for inhibiting the corrosion of copper and those commercially available, such as benzotriazole, tolyltriazole, and naphthotriazole. , Benzotriazolecarboxylic acids and their alkyl esters, including methyl, butyl, octyl, etc.
-Bisbenzotriazole, 5-nitrobenzotriazole, phenazinotriazole, 5-hexylbenzotriazole, 5-chlorobenzotriazole, 1-
(2,3-dihydroxypropyl) benzotriazole, 1- (2,3-dicarboxypropyl) benzotriazole, [1,2,3-benzotriazolyl-1-methyl] [1,2,4-triazole- 1-methyl] [2
-Ethylhexyl] amine, bis [(1-benzotriazolyl) methyl] phosphonic acid, 3-amino-1,2,
4-triazole, N- (cyclohexyl) -N, N-
And diethanolamine and salts thereof such as sodium salt and potassium salt.

Although molybdate is generally used as an ordinary corrosion inhibitor, it is expensive and requires a large amount of addition when used alone. By using in combination with the corrosion inhibitor, the molybdate has only utilized the corrosion inhibitory activity. The principle of corrosion suppression using molybdate in combination with a flow promoter is that molybdate forms an oxide film in the pipe tube to suppress corrosion, and due to the synergistic effect of adsorption of surfactant, It seems to have a corrosive function. By using the flow promoter for the fluid in combination with the molybdate, the corrosion is always suppressed, the progress of corrosion inside the pipe is eliminated, and the flow promotion function can be maintained for a long time. The concentration of the molybdate in the heat medium with respect to the flow promoter is about 10 to 3000 ppm, more preferably 20 to 15 ppm.
About 00 ppm, more preferably 25 to 1000 pp
When it is added so as to be about m, particularly preferably about 30 to 700 ppm, a sufficient corrosion inhibiting function can be exhibited and a flow promoting function can be maintained for a long time. When nitrite is added as a rust preventive to the heat medium, when the liquid temperature (use temperature) of the heat medium is 2 to 30 ° C. (cold water),
About 50 to 3000 ppm, more preferably 80 to 15 ppm
About 100 ppm, more preferably 100 to 1000 p
pm, and the liquid temperature of the heating medium (operating temperature) is 30
80-5000p for those of ~ 70 ° C (warm water)
pm, more preferably about 100 to 3000 ppm, and still more preferably about 100 to 2000 ppm. The concentration of the benzotriazole-based corrosion inhibitor in the heat medium as the flow promoter is about 0.5 to 100 ppm, more preferably about 0.5 to 50 ppm, and still more preferably 1 to 30 ppm.
If it is added so as to be about ppm, a sufficient corrosion inhibiting function can be exhibited even for copper, and the flow promoting function can be maintained for a long time.

[0026]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples, but the Examples are provided merely for explanation of the present invention and for reference to specific embodiments thereof. . These exemplifications are intended to illustrate certain specific embodiments of the present invention, but are not intended to limit or limit the scope of the invention disclosed herein. It is to be understood that the invention is capable of various embodiments based on the teachings herein. All examples, unless otherwise described in detail, are performed or can be performed using standard techniques, which are well known and routine to those skilled in the art. .

Example 1 A cold / hot water type air conditioning system shown in FIG. 1 was used. In Fig. 1, a cold / hot water generator (heat pump)
1 and the elevated tank 2 were connected by a heat medium transfer pipe 3, and the effect of reducing the drag of the heat medium (cold and hot water) and the corrosion tendency were tested. The apparatus shown in FIG. 1 is provided with an electromagnetic flow meter 4 and a differential pressure measuring device (U-tube manometer) 5, which can measure the respective flow rates and the pressure loss in the straight pipe section L between taps. The frequency of the circulation pump 6 was changed by the inverter 7, and the influence of each flow rate, each temperature, and the added flow promoter for fluid and the rust preventive agent containing molybdate or nitrite were examined. In the figure, reference numeral 8 denotes a temperature control device; C is a thermometer. As the cold / hot water generator (heat source) 1, an absorption cold / hot water generator (heat pump) was used. The circulation pump 6
A 1.5 kw mold piece suction centrifugal pump was used, and the pipe diameter of the heat medium transfer pipe 3 was 20 mm. The total length of the heat medium transfer pipe 3 was 220 m. The amount of water held in the air conditioning system is approximately 1.54 cubic meters. The inverter 7 used was a general-purpose inverter of 2.2 kw. The temperature range of cold and hot water was 7 to 10 ° C. for cold water and 50 ° C. for hot water.

In tap water, 500 ppm of oleylbishydroxyethylmethylammonium chloride ("Esocard (Eth. O / 12)", trade name: manufactured by Lion Corporation) is used as a fluid flow promoter, and Salicylic acid sodium salt 500p as counter ion component
pm. The obtained Eth. Sodium molybdate as a rust inhibitor was added to the O / 12 + sodium salicylate solution to reduce the drag (drag redu).
ction: DR). In the experiment, first of all, using tap water, the system was operated in an actual operating state, the number of revolutions of the motor was controlled by the inverter, the number of revolutions of the pump motor for each frequency was controlled, and The discharge pressure of the pump, the temperature of the heating medium (cold / hot water), and the flow rate (u [m / s]) were measured for each rotation speed. Next, tap water to which a flow promoter for fluid was added, and a flow promoter to which fluid and sodium molybdate were added were similarly measured. In addition, the frequency was lowered using an inverter, the flow velocity was set so as to be the same as that of tap water, and the current values at that time were compared to determine the amount of saving.

The results obtained are shown in FIGS. 2 and FIG. 3, when the corrosion inhibiting flow promoter of the present invention, that is, when sodium molybdate is added as a rust preventive, the DR effect (DR%) increases as the amount of sodium molybdate increases. You can see that it is. In particular, when 450 ppm or more is added, it is clear that a very high DR effect is exhibited in a wide temperature range of 7 to 50 ° C.

Example 2 As in Example 1, a cold / hot water type air conditioning system shown in FIG. 1 was used. The frequency of the circulating pump 6 was changed by the inverter 7, and the influence of each flow rate, each temperature, and the added rust preventive agent containing a fluid flow promoter and nitrite was examined. The temperature range of cold and hot water is 9 ° C for cold water and 5 for hot water.
0 ° C.

In tap water, 500 ppm of oleylbishydroxyethylmethylammonium chloride ("Ethocard (Eth.) O / 12", trade name: an antistatic agent manufactured by Lion Corporation) is used as a flow promoter for fluid, and Salicylic acid sodium salt 500p as counter ion component
pm. The obtained Eth. Sodium nitrite is added to the O / 12 + sodium salicylate solution as a rust preventive agent to reduce the drag (drag reducti).
on: DR). In the experiment, first, tap water was used, the system was operated as it was actually running, and the number of revolutions of the motor was controlled by the inverter.
Controls the number of rotations of the pump motor for each frequency, discharge pressure of the pump for each number of rotations of the pump, and heat medium (cold and hot water)
Temperature and flow rate (u [m / s]) were measured. Next, tap water to which a flow promoter for fluid was added, and a flow promoter to which fluid and sodium nitrite were added were measured in the same manner. In addition, the frequency was lowered using an inverter, the flow velocity was set so as to be the same as that of tap water, and the current values at that time were compared to determine the amount of saving.

The results obtained are shown in FIGS. 4 and 5, even when the corrosion inhibitory flow promoter of the present invention, that is, the rust inhibitor is sodium nitrite, the average flow velocity is about 1 to 1.5 m / s, especially as the amount of addition increases. D
It can be seen that the R effect has increased. At a liquid temperature of 9 ° C., the added amount of sodium nitrite is 100 to 1500 pp.
m, a considerable DR effect was observed, and at a liquid temperature of 50 ° C., it was very high at 100 to 1500 ppm.
It became clear that the effect was exhibited.

Example 3 Next, benzotriazole (BTA) was used as a corrosion inhibitor.
Was added, and the effect on the DR effect was examined in the same manner as in Example 1. However, as the flow promoter, Eth. O
/ 12 (500 ppm) + sodium salicylate (50
0 ppm) solution. The measurement results at around 9 ° C. and 50 ° C. are shown in FIGS. That is, low temperature (9
° C) and high temperature (50 ° C), it was observed that the addition of the benzotriazole corrosion inhibitor did not affect the DR effect.

Example 4 Flow promoter (Eth.O / 12) (500 ppm)
+ Sodium salicylate (300 ppm)), a flow promoter (Eth. O / 12) (500 pp)
m) + aqueous solution containing sodium salicylate (300 ppm) + sodium molybdate (150 ppm))
. Flow promoter (Eth.O / 12) (500 ppm)
+ Sodium salicylate (300 ppm) + sodium molybdate (100 ppm) + benzotriazole (5 ppm)). Flow promoter (Et
h. O / 12) (500 ppm) + sodium salicylate (300 ppm) + sodium nitrite (750 pp)
aqueous solution containing m)); Flow promoter (Eth.O / 1
2) (500 ppm) + sodium salicylate (300
ppm) + aqueous solution containing sodium nitrite (750 ppm) + benzotriazole (25 ppm)
ml into a beaker with a capacity of 500 ml each, and further into each beaker a test piece of iron and copper (31 c each).
m ² ), the water temperature was set to 60 ° C. using a magnetic stirrer, and 9
The test pieces were immersed for a period of time, and the concentrations of iron and copper in the aqueous solution and the corrosion rate (MDD) of iron and copper were measured to evaluate the corrosiveness of each test piece. The results are shown in Table 1.

[0035]

[Table 1]

From the results shown in Table 1, Eth. O / 12 +
With sodium salicylate alone, both iron and copper tend to corrode. Eth. O / 12 + sodium salicylate + sodium molybdate has an antirust effect on iron, but tends to corrode copper. E
th. O / 12 + sodium salicylate + sodium molybdate + BTA also has a good rust-preventing effect on copper. Sodium nitrite, a rust inhibitor, is also B
Those to which TA is added have a rust-preventive effect on both iron and copper.

From the above results, the flow promoter for fluid, that is, Eth. When molybdate, especially sodium molybdate is added as an anticorrosive to O / 12 + sodium salicylate and blended, it is suitable for use from a low temperature to around 50 ° C., and furthermore, in a region exceeding 70 ° C. Therefore, the effect of increasing the DR effect or having little effect on the DR effect can be expected. On the other hand, the effect of suppressing corrosion of piping can be expected. In addition, since a benzotriazole (BTA) -based corrosion inhibitor can be used, it is possible to suppress copper corrosion.

[0038]

EFFECTS OF THE INVENTION By using a flow promoter for a fluid together with molybdate or nitrite, corrosion is always suppressed, corrosion progress inside the pipe is eliminated, and the flow promotion function can be maintained for a long period of time. It is possible to improve the maintenance of the cooling medium transfer pipe that handles water. Furthermore, by adding and adding a benzotriazole-based corrosion inhibitor, it is possible to suppress the progress of corrosion inside the pipe using copper, maintain the flow promotion function for a long time, and improve maintenance management. be able to. According to the present invention, it is possible to provide an additive that can be used stably for a long period of time and that can reduce frictional resistance and the like in a wide range from a low temperature to a high temperature. In office buildings, factories, hospitals, department stores, hotels, public facilities, etc., it can be used not only for air conditioning equipment but also for various heating / cooling systems and district cooling / heating systems. Obviously, the present invention can be practiced other than as specifically described in the foregoing description and examples. Many modifications and variations of the present invention are possible in light of the above teachings, and so are within the scope of the appended claims.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus used for evaluating a DR effect using a heat pump.

FIG. 2 is a graph showing the effect of sodium molybdate on the DR effect at around 7 to 10 ° C.

FIG. 3. DR of sodium molybdate around 50 ° C.
It is a graph showing the effect on an effect.

FIG. 4 is a graph showing the effect of sodium nitrite on the DR effect at around 9 ° C.

FIG. 5 is a graph showing the effect of sodium nitrite on the DR effect at around 50 ° C.

FIG. 6: D of benzotriazole-based rust inhibitor near 9 ° C.
It is a graph showing the influence which it has on R effect.

FIG. 7 is a graph showing the effect of a benzotriazole-based rust inhibitor on the DR effect at around 50 ° C.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Takashi Saeki 7-72 Asakura-cho, Yamaguchi-shi, Yamaguchi F-term (reference) 4K062 AA03 BA08 BA10 BB18 BB25 CA05 CA08 FA05 GA04

Claims (18)

[Claims] 1. A corrosion-inhibiting flow promoter for cold and hot water, which is obtained by adding and mixing a molybdate-containing rust inhibitor to a fluid flow promoter. 2. A corrosion-inhibiting flow promoter for cold and hot water characterized by adding and mixing a rust inhibitor containing nitrite to a fluid flow promoter. 3. The fluid flow promoter according to claim 1, wherein the fluid flow promoter comprises a surfactant and a counter-ionic agent.
Or the corrosion inhibiting flow promoter for cold and hot water according to 2. 4. A surfactant as a fluid flow promoter,
A component of the following formula: (Wherein, R1 is an alkyl group having 12 to 26 carbon atoms or an alkenyl group having 12 to 26 carbon atoms, and R2 is a carbon atom having 1 to 4 carbon atoms substituted with an alkyl group having 1 to 4 carbon atoms or a hydroxy group. X is an integer of 1 to 4, Y is
Is an integer of 1 to 4, and A represents an anion. 4. The corrosion-inhibiting flow promoter for cold and hot water according to claim 3, which comprises: 5. A surfactant, which is a flow promoter for a fluid,
A component of the following formula: Wherein R1 is an oleyl group, R2 is a methyl group,
X is an integer of 2, Y is an integer of 2, and A represents chlorine or bromine. 5. The method according to claim 3, wherein
The corrosion-inhibiting flow promoter for cold and hot water according to 1. 6. The corrosion inhibiting flow promoter for cold and hot water according to claim 3, wherein the counter ion agent is a salicylate. 7. The corrosion-inhibiting flow promoter for cold and hot water according to claim 3, wherein the counter-ionic agent contains salicylic acid sodium salt or salicylic acid potassium salt. 8. The corrosion inhibiting flow promoter for cold and hot water according to claim 1, wherein the molybdate is sodium molybdate or lithium molybdate. . 9. The cold temperature as claimed in claim 2, wherein the nitrite is selected from the group consisting of sodium nitrite, potassium nitrite and lithium nitrite. Corrosion inhibiting flow promoter for water. 10. The method according to claim 1, further comprising a benzotriazole-based corrosion inhibitor.
Item 8. The corrosion inhibitory flow promoter for cold and hot water according to Item. 11. A benzotriazole-based corrosion inhibitor,
Benzotriazole, tolyltriazole, naphthotriazole, benzotriazolecarboxylic acid and its methyl, butyl, alkyl esters including octyl,
5,5-bisbenzotriazole, 5-nitrobenzotriazole, phenazinotriazole, 5-hexylbenzotriazole, 5-chlorobenzotriazole, 1
-(2,3-dihydroxypropyl) benzotriazole, 1- (2,3-dicarboxypropyl) benzotriazole, [1,2,3-benzotriazolyl-1-methyl] [1,2,4-triazole -1-methyl] [2
-Ethylhexyl] amine, bis [(1-benzotriazolyl) methyl] phosphonic acid, 3-amino-1,2,4
The corrosion-inhibiting flow-promoting flow for cold and hot water according to claim 10, characterized in that it contains one selected from the group consisting of -triazole, N- (cyclohexyl) -N, N-diethanolamine and salts thereof. Agent. 12. The heating medium containing a flow promoter according to claim 4.
Or a corrosion-suppressing heat medium for cold and hot water, comprising 100 to 1200 ppm of the surfactant according to 5 and 100 to 1200 ppm of a salicylate component and 20 to 1500 ppm of molybdate. 13. The heat medium containing a flow promoter according to claim 4.
Or a corrosion inhibiting heat medium for cold and hot water, comprising 100 to 1200 ppm of the surfactant according to 5, and 100 to 1200 ppm of a salicylate component, and further containing 30 to 700 ppm of a molybdate. 14. The heating medium containing a flow promoter according to claim 4.
Or 100 to 1200 ppm of the surfactant described in 5 and 100 to 1200 ppm of the salicylate component, and the liquid temperature of the heating medium is 2 to 30 ° C .;
A corrosion-suppressing heat medium for cold and hot water, comprising about 00 to 1500 ppm. 15. The heating medium containing a flow promoter according to claim 4.
Or 100 to 1200 ppm of the surfactant described in 5 and 100 to 1200 ppm of the salicylate component, and the liquid temperature of the heating medium is 2 to 30 ° C .;
A corrosion-suppressing heat medium for cold and hot water, which contains 0.00 to 1000 ppm. 16. The heating medium containing a flow promoter according to claim 4.
Or 100 to 1200 ppm of the surfactant according to 5 and 100 to 1200 ppm of the salicylate component, and the liquid temperature of the heating medium is 30 to 70 ° C., and the nitrite further contains 100 to 3000 ppm. Corrosion inhibiting heat medium for cold and hot water. 17. The heat medium containing a flow promoter according to claim 4.
Or 100 to 1200 ppm of the surfactant according to 5 and 100 to 1200 ppm of the salicylate component, and the liquid temperature of the heating medium is 30 to 70 ° C., and the nitrite further contains 500 to 2000 ppm. Corrosion inhibiting heat medium for cold and hot water. 18. The heat medium containing a flow promoter according to claim 4.
Or a corrosion-suppressing heat medium for cold and hot water, comprising 100 to 1200 ppm of the surfactant according to 5 and 100 to 1200 ppm of a salicylate component, and further containing 1 to 30 ppm of benzotriazole.