KR20150033516A

KR20150033516A - Strong acidic solution leak detection sensor

Info

Publication number: KR20150033516A
Application number: KR20140078900A
Authority: KR
Inventors: 유홍근
Original assignee: (주)유민에쓰티
Priority date: 2013-09-24
Filing date: 2014-06-26
Publication date: 2015-04-01

Abstract

The present invention relates to a device for detecting the leak of a strong acidic solution, and more specifically, to a device for detecting the leak of a strong acidic solution to detect the leak of a toxic chemical solution which is strong acid such as sulfuric acid, hydrochloric acid, nitric acid, and hydrofluoric acid. The present invention is composed of a base film layer formed of a film material and a conductive line longitudinally formed on the top of the base film layer. The base film layer is formed of a synthetic resin. The conductive line is formed by mixing 40-90 wt% of a conductive carbon dispersion and 10-60 wt% of a synthetic resin binder and is printed by a printing method.

Description

Technical Field [0001] The present invention relates to a strong acidic solution leak detection sensor,

TECHNICAL FIELD The present invention relates to a strongly acidic solution leakage detecting apparatus, and more particularly, to a strongly acid solution leakage detecting apparatus for detecting leakage of a strongly acidic toxic chemical solution such as sulfuric acid, hydrochloric acid, nitric acid,

The applicant of the present invention has already proposed a tape-like leak detection sensor that can easily detect the occurrence of leakage by providing a tape-like shape in a number of registered patents (10-0909242, 10-0827385, etc.) have.

1 and 2, the leak sensor 100 includes a lower adhesive layer 120, a base film layer 110, and an upper protective film layer 130 sequentially stacked on the bottom surface.

The base film layer 110 is a layer in which the conductive lines 111 and 112 are formed on the upper part and the upper part of the conductive lines 111 and 112 It is formed of a film made of PET, PE, PTFE, PVC or other Teflon series to form a pattern in a printing method.

The conductive lines 111 and 112 are arranged in strips parallel to each other in the longitudinal direction, spaced from each other on the upper surface of the base film layer 110, and printed with a conductive ink or silver compound.

The upper protective film layer 130 is a layer for protecting the conductive lines 111 and 112 from external stimuli by being laminated on the base film layer 110. The upper protective film layer 130 may be made of PET, Or other Teflon-based materials, and the sensing holes 131 are formed at predetermined intervals in positions corresponding to the conductive lines 111 and 112, respectively.

Therefore, when water leakage occurs, water is introduced through the sensing hole 131 at the position where the water leakage occurs, so that the two conductive lines 111 and 112 are energized by moisture, and the remote controller is in the energized state So that it is possible to detect the leakage and to generate an alarm accordingly.

However, such a conventional film type leak sensor 100 can detect not only water but also strong acidic toxic chemical solutions such as sulfuric acid, hydrochloric acid, nitric acid, and hydrofluoric acid having conductivity, but the base film layer 110 And the conductive lines 111 and 112 are dissolved, and leakage of the strongly acidic solution is difficult to detect.

In addition, since the conductive lines 111 and 112 dissolve quickly, variations in the resistance values of the conductive lines 111 and 112 can not be accurately measured, and therefore, there is a problem that the type of strongly acidic solution to be leaked can not be determined.

In order to solve the above problems, the present invention provides a base film layer made of a film material which is not dissolved in a strongly acidic solution, and the conductive line is made of a material whose resistance value changes in response to a strongly acidic solution, And to detect a strong acid solution leakage.

It is still another object of the present invention to provide a method and apparatus for measuring a time period when a resistance value changes within a range of a limit resistance value by setting a vertical limit resistance value from a basic resistance value of a conductive line, And to provide a solution leakage detecting device.

According to an aspect of the present invention, there is provided a strongly acidic solution leakage detecting apparatus,

A base film layer made of a film material;

And a conductive line formed in a longitudinal direction on an upper surface of the base film layer,

Wherein the base film layer is formed of a synthetic resin material,

The conductive line

40 to 90% by weight of a conductive carbon dispersion and 10 to 60% by weight of a synthetic resin binder are mixed and printed by a printing method.

When the conductive carbon dispersion is converted to 100 wt% of the conductive carbon dispersion, the conductive carbon dispersion may contain 1 to 20 wt% of CNT or graphene or carbon black powder, 80 to 98 wt% of a neutral series solvent of Ph 6.5 to 7.5, And 1 to 10% by weight of a nonionic surfactant dispersant.

The binder is composed of 40 to 60% by weight of a resin such as acrylic alkyd resin or PE or PU or PC or epoxy, and 40 to 60% by weight of a volatile solvent when 10 to 60% by weight of the binder is converted into 100% do.

And,

A base film layer made of a film material;

A pair of conductive lines formed on the upper surface of the base film layer in a lengthwise direction;

Wherein a strongly acidic solution sensing sensor is constituted by a coating layer covering the conductive line, the material being dissolved by a strongly acidic solution,

A controller is connected to the strongly acidic solution detecting sensor to supply sensing power to the conductive line and generate an alarm according to a change in resistance value over time.

The present invention forms a base film layer and a conductive line by a substance whose resistance value is changed by a strongly acidic solution, so that a strong acidic component can be accurately detected when it is installed in a toxic substance storage facility or transport facility having strong acidity In addition, since it has a tape shape, it can be easily installed in piping and the like, and the manufacturing cost is low, which is also advantageous in cost competitiveness.

In addition, by generating an alarm according to the type of the strongly acidic solution, quick and correct measures can be taken for the kind of the leaked solution.

1 is a view showing a decomposition structure of a known leak detection sensor;
2 is an assembled sectional view of Fig.
3 is a view showing a structure according to a first embodiment of the present invention;
4 is a view for explaining a change in resistance value of a conductive line due to leakage of a strongly acidic solution;
5 is a circuit diagram showing a state of a controller and a circuit connected to a first embodiment of the present invention;
6 is a view showing a second embodiment of the present invention;
FIG. 7 is a circuit diagram showing a state of a controller connected to a second embodiment of the present invention; FIG.
8 is a graph showing an operation state of a controller for generating an alarm by a change in resistance value depending on the type of leaked strong acid solution.
9 is a view showing another embodiment of a strongly acid solution sensing sensor.
10 and 11 are views showing an example for forming a conductive line.

The present invention will be described in detail with reference to the accompanying drawings.

The basic structure of the strongly acidic solution sensing sensor 200 according to the first embodiment of the present invention is the same as that already described with reference to FIGS. 1 and 2, and therefore, the base film layer 210 and the conductive lines 211 and 212 ), And the upper protective film layer 230 will be mainly described.

First, a strong acid solution, which is a toxic substance, leaks into the soil or the atmosphere, resulting in water pollution, soil pollution, air pollution, etc., resulting in material damage as well as personal injury.

Accordingly, it is necessary to be able to detect leakage of such an acidic solution quickly and at low cost. To this end, the present invention is characterized in that the base film layer 210, the conductive lines 211 and 212, and the upper protective film layer 230 are formed of sulfuric acid, Etc., that is, an acidic solution.

For this, the base film layer 210 is formed of a synthetic resin material such as PC, PP, PE, PET, PI, and PTFE (Teflon), and its thickness is 50 to 300 탆.

The composition of the conductive lines 211 and 212 may be a conductive carbon dispersion having conductivity such as active carbon or carbon nanotube (CNT), graphene or carbon black, an acrylic alkyd resin or PE or PU Or a binder such as PC or epoxy is mixed. The conductive carbon ink is mixed with 40 to 90 wt% of the conductive carbon dispersion and 10 to 60 wt% of the binder to form a conductive carbon ink. The conductive carbon ink is gravure printed, The conductive lines 211 and 212 are formed by printing on the base film layer 110 by various printing methods such as a printing method and an inkjet printing method.

In this case, when the acrylic alkyd resin is mixed as the binder, when the binder is converted to 100 to 100% by weight, 40 to 60% by weight of the acrylic alkyd resin and 40 to 60% by weight of the volatile solvent are mixed, The alkyd resin is strong in strong acid, and has strong adhesion to the base film layer 210 during printing. The volatile solvent enhances the volatility during printing to facilitate the printing operation.

When PE or PU, PC, epoxy or the like is used as the binder, 40 to 60% by weight of a resin such as PE or PU, PC or epoxy may be mixed with 40 to 60% by weight of volatile solvent .

When the conductive carbon dispersion contains 40 to 90% by weight as 100% by weight, 1 to 20% by weight of active carbon or CNT or graphene or carbon black powder, 80 to 98% by weight of ethylcellosolve solvent, And 1 to 10% by weight of a nonionic surfactant dispersant are mixed to form a paste. The CNT or graphene or carbon black powder has electrical conductivity. The ethylcellosolve solvent and the nonionic surfactant dispersant are conductive Stabilize the carbon structure, and even out the particles.

Further, in place of the ethyl cellosolve solvent, a neutral series solvent having a pH of about 6.5 to 7.5, such as IPA, water, ethyl alcohol or methyl alcohol, may be used.

The conductive lines 211 and 212 are formed by various methods such as a conductive carbon dispersion and a gravure method. The thickness of the conductive lines 211 and 212 is about 2 to 20 μm.

The upper protective film layer 230 is formed of a synthetic resin material such as PC, PP, PE, PI, PET, Teflon or the like resistant to strongly acidic solution to a thickness of 50 to 300 탆. 231 are formed.

Accordingly, when leakage of the strongly acidic solution occurs, the strongly acidic solution flows into the sensing hole 231 at the position where the leakage occurs. As shown in FIG. 4, the binder constituting the conductive lines 211 and 212 reacts with the strongly acidic solution, The conductive carbon particles are collapsed and collapsed.

As a result, the resistance value of the conductive lines 211 and 212 increases, and the remote controller can receive a change in resistance value of the conductive lines 211 and 212 to check whether the strong acid solution leaks.

At this time, the conductive lines 211 and 212 may be configured as shown in Table 1 below.

The first conductive line 211, The second conductive line 212,
One Active carbon or carbon black or carbon nanotube (CNT) or graphene + binder Active carbon or carbon black or carbon nanotube (CNT) or graphene + binder 2 Is a compound Active carbon or carbon black or carbon nanotube (CNT) or graphene + binder 3 Metal sheet Active carbon or carbon black or carbon nanotube (CNT) or graphene + binder 4 Other conductors Active carbon or carbon black or carbon nanotube (CNT) or graphene + binder

When the first conductive line 211 and the second conductive line 212 are both mixed with active carbon or carbon black or carbon nanotube (CNT) or graphene, the first conductive line 211 and the first conductive line 211 A sensing hole 231 is formed at a position corresponding to the second conductive line 212.

However, when the first conductive line 211 is formed of a conductive material such as a silver compound, a thin metal plate, or a conductive ink, and only the second conductive line 212 is in contact with active carbon or carbon black, carbon nanotubes (CNT), or graphene If the binder is formed in a mixed form, the sensing hole 231 should be formed only at a position corresponding to the second conductive line 212.

This is to protect the first conductive line 211 when the first conductive line 211 is formed of a material which is weak to the strongly acidic solution.

5 (a), the start connector 400 and the end connector 500 (see FIG. 5) are provided at both ends of the strongly acid solution detecting sensor 200, as shown in FIG. 5 The start connector 400 is connected to the controller 300 and the end connector 500 is a connector for connecting the conductive lines 211 and 212 at the ends of the strongly acid solution sensing sensor 200.

5B is a circuit diagram illustrating a case where the second conductive line 212 is formed of a material whose resistance value changes in response to a strongly acidic solution and the first conductive line 211 is formed of a conductive material. A leakage occurs to flow through the sensing hole 231 and come into contact with the second conductive line 212 to cause a change in the resistance value of the second conductive line 212. This causes the remote controller 300 to generate a strong acid solution The leakage of the fuel can be confirmed.

6 is a view showing a second embodiment of the present invention. As shown in FIG. 6, an enamel, an alkyd resin, PE, PET, PC, polyacetal (POM), polymethylmethacrylate (PMMA) Such as polyamide (PA), ionomer (saline), polyarylate, polyester elastomer (PEE) and phenol resin (PF) It is a substance which is dissolved by a strongly acidic solution but is not dissolved by water, and may be formed by bar coating, slot die coating, gravure coating or the like.

In addition, the coating layer 240 may be formed of various polymer composite materials, and the conductive lines 211 and 212 may be formed of a conductive material such as a conductive ink, a silver compound, a metal sheet, or a thin plate.

Therefore, when water is introduced through the sensing hole 231, the conductive layer 211 and 212 are protected by the coating layer 240 and are not energized. Only when the conductive strongly acidic solution is introduced, the coating layer 240 is dissolved or eroded As a result, the resistance values of the conductive lines 111 and 112 formed by the conductive material are changed as shown in FIG. 7 by changing the resistance value. Thus, the leakage of the strong acid solution can be detected.

In this case, the thickness of the coating layer 240 is 2 to 20 占 퐉.

The coating layer 240 may be formed by mixing 90 to 99% by weight of enamel with 1 to 10% by weight of a curing agent. The curing agent may be isocyanate or melamine.

On the other hand, the strongly acidic solution has various kinds such as sulfuric acid, hydrochloric acid, nitric acid, and hydrofluoric acid. However, in the structure in which the resistance values change due to the conduction of the conductive lines 211 and 212, It is very difficult to identify the type of strongly acidic solution which can be detected only by leakage.

Accordingly, in the present invention, it is possible to identify the type of strong acid solution that leaks according to the change of the resistance value with time.

To this end, the controller 300 receives the resistance value change caused by the change in the resistance value of the conductive line 212 or the conductive line 211 or 212 and the change in resistance value in the first and second embodiments, The change of the resistance value is confirmed, and the type of strongly acidic solution is determined.

8 is a graph for explaining the operation state of the controller 300 for discriminating the type of strongly acidic solution according to the resistance value change between the two conductive lines 211 and 212 in a state where the coating layer 240 is formed as in the second embodiment As a graph, a reference resistance value according to the sensor length of the strongly acid solution sensing sensor 200 is set in the controller 300. Based on the reference resistance value, the controller 300 measures the external resistance, The '+' offset value and the '-' offset value are set so as to absorb a change in the self-resistance value that follows.

The offset value is adjusted according to the environment in which the strong acid solution sensor 200 is installed.

In the controller 300, an alarm set value (High Limit), that is, an upper limit resistance value is set in the '+' direction of the reference resistance value, and an alarm set value (Low Limit) And the sensitivity of the sensing can be adjusted by adjusting the range of the alarm set value.

Therefore, the type of strongly acidic solution can be determined by measuring the time during which the resistance value between the conductive lines 211 and 212 gradually decreases as the strongly acidic solution leaks to fall within the range of the alarm set value.

For example, in the case of the chemical solution A, when the coating layer 240 is leaked and comes into contact with the coating layer 240, the coating layer 240 is dissolved or corroded to cause a change in resistance value. The controller 300 can measure the time when the resistance value changes within the range of the value and determine the type of strong acid solution according to the measuring time.

In the case of the chemical solution B, the chemical solution C and the chemical solution D, the resistance value changes within a range of the alarm set value within a relatively short period of time compared with the chemical solution A. Thus, the controller 300 measures such time, The kind of solution can be determined.

Accordingly, when the resistance change value of each chemical solution matches the alarm setting value (High Limit), the controller 300 generates an alarm at that position, and then continuously detects a change in the resistance value. The resistance value may be changed to deviate from the alarm set value (Low Limit) as in the chemical solution D, and the controller 300 generates an alarm at a position where the alarm set value (Low Limit) deviates.

The controller 300 stores data on a change in the resistance value over time of the various strongly acidic solutions. The controller 300 determines the time at which the resistance value changes into the range of the alarm set value from when the change in the initial resistance value occurs An alarm may be generated about the kind of the chemical solution, i.e., the strong acid solution, corresponding to the time.

In the case of the first embodiment, when the resistance value of the conductive line 212 is increased by the acid solution, the resistance value increases as time elapses.

That is, when the resistance values of the conductive lines 211 and 212 decrease or increase according to the first and second embodiments of the present invention, the degree of change of the resistance value is determined with the lapse of time, . &Lt; / RTI >

9, the cable sensor 600 may be a two-stranded conductor (not shown) as shown in FIG. 9, and the cable type sensor may be replaced with a cable type sensor. And the coating layer 630 is coated with a material dissolvable by the strongly acidic solution on the outside thereof while the lines 610 and 620 are spaced apart from each other.

The coating layer 630 may be coated with a mixture of 60 to 90% by weight of carbon nanotube (CNT) dispersion and 10 to 50% by weight of an acrylic alkyd resin mixed with a volatile solvent, like the coating layer 240 of the present invention.

Further, the coating layer 630 may be formed of a material which is dissolved or eroded by the strongly acidic solution.

Therefore, when the strongly acidic solution comes into contact with the coating layer 630, the coating layer 630 dissolves and changes in the resistance value, and the resistance value between the conductive lines 610 and 620 is changed by the change in the resistance value .

Other operations are already described above.

When the conductive lines 211 and 212 are formed of active carbon, carbon black, carbon nanotube (CNT), or graphene, the conductive lines 211 and 212 may be formed by a printing method, (211-1, 212-1) is formed by attaching a double-sided tape or an adhesive to a position where the conductive lines (211), (212) are to be formed on the upper surface of the electrode It can be formed by spraying black or carbon nanotubes (CNT) or graphene.

That is, the conductive powder is sprayed onto the adhesive agents 211-1 and 212-1 to form the conductive lines 211 and 212. [

Therefore, conductive carbon black, carbon nanotube (CNT), or graphene may be attached only at the positions where the adhesives 211-1 and 212-1 are formed to form a conductive line.

Alternatively, the conductive lines 211 and 212 can be formed by a sputtering process in which the sputtering process places the base film layer 210 of the present invention and the metal having conductivity in the vacuum chamber, A protective film 213 is formed on the film layer 210 except for a position where a conductive line is to be formed, as shown in FIG.

The protective film 213 may be a tape made of synthetic resin.

When a negative voltage is applied to the metal having conductivity and a positive voltage is applied to the base film layer 210 and then argon gas is introduced into the vacuum chamber, the ionized argon gas collides with the metal having conductivity, The metal particles are deposited on the base film layer 210.

When the protective film 213 is removed after the deposition process is completed, the conductive lines 211 and 212 are formed.

The reason why the sputtering process is used is that when the conductive lines 211 and 212 are formed of a conductive material such as a conductive ink, a silver compound, a metal sheet or a thin plate, the sputtering process has a high resistance value because it has a thickness of 5 to 10 μm, The thicknesses of the conductive lines 211 and 212 and the coating layer 240 are increased to 30 to 50 μm when the coating layer 240 is applied to the substrate 210. The thickness of the conductive lines 211 and 212 increases the thickness of the coating layer 240, So that it can not adhere to the film layer 210.

However, when such a sputtering method is used, since the thickness of the conductive lines 211 and 212 can be 0.1 to 1 μm, the thickness of the conductive lines 211 and 212 can be reduced and the coating layer 240 can be stably .

On the other hand, the conductive lines 211 and 212 are formed by mixing active carbon or carbon black, carbon nanotube (CNT) or graphene, rather than two, with a binder, and only one conductive line is formed on the upper part of the base film layer 210 And both ends of the one conductive line may be connected to the controller by a conductive cable.

210: base film layer 211, 212: conductive line
220: lower adhesive layer 230: upper protective film layer
231: sensing hole 240: coating layer
300: Controller 400: Start connector
500: Ent connector

Claims

A base film layer made of a film material;
And a conductive line formed in a longitudinal direction on an upper surface of the base film layer,
Wherein the base film layer is formed of a synthetic resin material,
The conductive line
Characterized in that 40 to 90% by weight of a conductive carbon dispersion and 10 to 60% by weight of a synthetic resin binder are mixed and printed by a printing method.

The conductive carbon dispersion according to claim 1, wherein the conductive carbon dispersion comprises 1 to 20% by weight of activated carbon or CNT or graphene or carbon black powder, a neutral series of Ph 6.5 to 7.5 when converted to 100 to 90% by weight of the conductive carbon dispersion, 80 to 98% by weight of a solvent, and 1 to 10% by weight of a nonionic surfactant dispersant.

The binder according to claim 1, wherein the binder comprises 40 to 60% by weight of a resin such as acrylic alkyd resin or PE or PU or PC or epoxy, 40 to 60% by weight of a volatile solvent when 10 to 60% by weight of the binder is converted into 100% Wherein the liquid-absorbent solution is mixed with the liquid.

A base film layer made of a film material;
And a conductive line formed in a longitudinal direction on an upper surface of the base film layer,
Wherein the base film layer is formed of a synthetic resin material,
And a coating layer formed by mixing 90 to 99% by weight of enamel with 1 to 10% by weight of a curing agent is formed on the upper surface of the conductive line.

The strongly acidic solution leakage detecting apparatus according to claim 4, wherein the curing agent is isocyanate or melamine.

A base film layer made of a film material;
And a conductive line formed in a longitudinal direction on an upper surface of the base film layer,
Wherein the base film layer is formed of a synthetic resin material,
The upper surface of the conductive line may be made of an inorganic material such as enamel, alkyd resin, PE, PET, PC, polyacetal (POM), polymethyl methacrylate (PMMA), polyamide (PA), ionomer, polyarylate, Wherein the coating layer is formed of any one of econol, polyester elastomer (PEE) and phenol resin (PF), or a coating layer is formed of a polymer composite material.

A base film layer made of a film material;
A conductive line formed in a longitudinal direction on an upper surface of the base film layer;
A strongly acidic solution sensor is constituted by a coating layer covering the conductive line, the material being dissolved or eroded by a strongly acidic solution,
Wherein the controller is connected to the strong acid solution sensing sensor to supply sensing power to the conductive line and generate an alarm according to a change in resistance value over time.

A base film layer made of a film material;
And a conductive line formed in the longitudinal direction on the upper surface of the base film layer, the resistance of which is changed in response to the strongly acidic solution,
Wherein the controller is connected to the strong acid solution sensing sensor to supply sensing power to the conductive line and generate an alarm according to a change in resistance value over time.

Two stranded conductors spaced side by side;
And a coating layer coated on the outside of the conductive line as a material to be dissolved or corroded by the strongly acidic solution,
Wherein the controller is connected to the strong acid solution sensing sensor to supply sensing power to the conductive line and generate an alarm according to a change in resistance value over time.

The method of claim 7, 8, or 9, wherein the controller sets a reference resistance value of the strongly acid solution sensing sensor, and outputs an alarm in the '+' direction and the ' Characterized in that an upper limit resistance value and a lower limit resistance value of the set value are set.

10. The strongly acidic solution leakage detecting apparatus according to claim 4 or 9, wherein the conductive lines are formed in a pair and each conductive line can be configured as shown in Table 1 below.

The conductive line according to claim 4 or 6 or 7 or 8, characterized in that the conductive line is formed by forming an adhesive agent on the upper surface of the base film layer and spraying conductive powder to the adhesive agent Wherein the liquid leakage sensing device is a liquid sensor.

The strongly acidic solution leakage sensing apparatus according to any one of claims 4, 6, 7, and 8, wherein the conductive line is formed by a sputtering process.