Patent Application
20150362397
The present invention relates to a device for detecting a leakage of an acidic solution, and more particularly to a device for detecting a leakage of a poisonous acidic chemical solution, for example, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc.
In the Korean patent registration numbers 10-0909242 and 10-0827385, the applicant of the present invention disclosed a tape type leakage detection sensor which is made in a tape type and allows to easily detect any leakage by installing it at a portion where leakage may occur.
Referring to
The lower adhering layer 120 will be adhered to a portion where leakage may occur and is formed in an adhering tape form. The base film layer 110 is a layer on which conductive lines 111 and 112 are intended to be formed. The base film layer 110 is made of a film material of PET, PE, PTFE, PVC or other Teflon materials so as to print-form a pattern of the conductive lines 111 and 112.
In addition, the conductive lines 111 and 112 are formed spaced at a predetermined distance from the upper surface of the base film layer 110 lengthwise in parallel and are arranged in a strip shape and are printed with a conductive ink or a silver compound.
The upper protection film layer 130 is laminated on the top of the base film layer 110 so as to protect the conductive lines 111 and 112 from external to impacts. Like the base film layer 110, the upper protection film layer 130 is made of a film material of PET, PE, PTFE, PVC or other Teflon materials. Passing-through sensing holes 131 are formed at regular intervals at the portions corresponding to the conductive lines 111 and 112.
Therefore, if leakage occurs, moisture may input through the sensing is holes 131 of where the leakages have occurred, so the two conductive lines 111 and 112 become conductive by with the aid of moisture, and a distant controller can detect any leakage by checking a conducting state, more specifically, a state where closed circuits are formed, thus generating alarm.
The conventional film type leakage detection sensor 100 can detect a poisonous acidic chemical solution, for example, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. which are all conductive. If it is installed at an outdoor storing tank or a pipe wherein acidic liquid is stored and is used to detect any leakage of acidic solution, error operations may occur since alarming may occur even when the conventional film type leakage detection sensor 100 exposes to moisture, rain water, dew formation, snow, vapor, etc.
In addition, if the base film layer 110 and the conductive lines 111 and 112 dissolve by any acidic solution, leakage detection of any strongly acidic solution may become impossible.
Accordingly, the present invention is made in an effort to resolve the above problems. It is an object of the present invention to provide a device for detecting leakage of acidic solution which is configured to operate as conductive lines become conductive only when acidic solution leakages.
It is another object of the present invention to provide a device for detecting leakage of acidic solution wherein a base film layer is made of a film material, which does not dissolve by strongly acidic solution, and conductive lines are made of materials which don't dissolve by a strongly acidic solution, thus allowing to obtain accurate detection of a strongly acidic solution.
To achieve the above objects, there is provided a device for detecting a leakage of acidic solution, which may include, but is not limited to, a base film layer which is made of a film material; a pair of conductive lines which are formed lengthwise in parallel with each other on an upper surface of the base film layer; and a coating layer which is coated on an upper surface of the base film layer so that the conductive lines don't expose to the outside by a substance which is dissolved by the acidic solution.
To achieve the above objects, there is provided a device for detecting a leakage of strongly acidic solution, which may include, but is not limited to, a base film layer which is made of a film material; a pair of conductive lines which are formed lengthwise in parallel with each other on an upper surface of the base film layer, wherein the base film layer is made of a synthetic resin, and the conductive lines are made in such a way that 60˜90% by weight of a CNT (Carbon Nano Tube) dispersion and 10˜50% by weight of an acryl alkyd resin mixed with a volatile solvent are mixed and printed by a printing method.
In addition, the CNT dispersion is formed by mixing 1˜10% by weight of a CNT powder, 80˜98% by weight of an ethyl cellosolve solvent and 1˜10% by weight of a nonionic surfactant dispersion.
The device for detecting leakage of acidic solution according to the present invention becomes conductive since it reacts with only acidic solution. If the device of the present invention is installed at an acidic, poisonous substance storing facility or transportation facility, only acidic components can be accurately detected. In addition, the device of the present invention is formed in a tape type, which may contribute to easier installation, for example, at a pipe or the like. Manufacturing does not cost a lot, and price competition is good.
The present invention will be described with reference to the accompanying drawings.
First, acidic solution, which is a poison, has an electrical conduction like water, and if such an acidic solution leaks into soil or air, water contamination, soil contamination, air contamination, etc. may occur, thus causing any physical damages or damages to people.
For this reason, it needs to detect any leakage of such an acidic solution quickly and at low cost. To this end, the present invention may be configured in the way that a coating layer 200 which may be easily dissolved by a strongly acidic poisonous chemical solution, for example, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. may be formed on an upper surface of the base film layer 110 on which conductive lines 111 and 112 are formed. This coating layer 200 may be formed on the whole upper surfaces of the base film layer 110 or may be coated only on the portion where the conductive lines 111 and 112 are formed so as to isolate only the conductive lines 111 and 112 from the outside.
It is preferred that the coating layer 200 may be coated in such a way that enamel, melanin, urethane, other synthetic resin, etc., which can be easily dissolved by acid solution, is sprayed coated in a thin membrane shape.
The upper side protection film layer 130 in which the sensing holes 131 are formed may be laminated on the top of the coating layer 200. Here, the upper side protection film layer 130 may be selectively laminated.
Namely, it is preferred that the upper side protection film layer 130 may be laminated so as to protect the coating layer 200 in case of an outdoor space which external environment influences a lot. In the indoor space, the upper side protection film layer 130 may be laminated or may not be laminated according to situations given.
The present invention will be described with an example wherein the upper side protection film layer 130 is laminated.
If the device of the present invention is installed attached to a joint portion of pipe through which acidic solution flows or to an outer surface of a storing tank or is installed wound around the same, the acidic solution may leak, and the acidic solution 300, as illustrated in
The distant controller may be configured to confirm the above conductive state and the leakage of the acidic solution.
In case where acidic solution has leaked, the leaked acidic solution may dissolve the coating layer 210, which is the upper most layer, is dissolved, and input through the sensing holes 131, thus allowing for conduction of the conductive lines 111 and 112, which makes it possible to detect leakage.
In the configurations in
It is most preferred that the configuration in
Meanwhile, in order to selectively detect a strongly acidic poisonous chemical solution, for example, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc., the device for detecting a leakage of acidic solution according to the present invention may include, but is not limited to, a base film layer which is made of a film material; a pair of conductive lines which are formed lengthwise in parallel with each other on an upper surface of the base film layer, wherein the base film layer is made of a synthetic resin, and the conductive lines are made in such a way that 60˜90% by weight of a CNT (Carbon Nano Tube) dispersion and 10˜50% by weight of an acryl alkyd resin mixed with a volatile solvent are mixed and printed by a printing method.
Since the basic configuration of the above embodiment is same as the configuration described along with
First, a poisonous and strongly acidic solution has an electrical conductivity like water. If it leaks into soil or air, water contamination, soil contamination, air contamination, etc. may occur, thus causing any physical damages or damages to people.
For this reason, it needs to detect a leakage of such acidic solution quickly and at low cost. To this end, the present invention may be configured in is the way that the base film layer 110, the conductive lines 111 and 112, and the upper side protection film layer 120 should not be dissolved by poisonous and strongly acidic chemical solution, for example, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. which namely are acidic solution.
To this end, the base film 110 is made of a synthetic resin, for example, PC, PP, PE, PET, PTFE (Teflon) materials, etc. The thickness of the base film 110 is 100˜250 μm.
If the base film layer 110 is formed of a synthetic resin, for example, PC, PP, PTFE, etc. which is not easily dissolved by strong acid, it is preferred that the thickness thereof is 100˜130 μm, and if the base film layer 110 is formed of a synthetic resin, for example, PE, PET, etc. which can be easily dissolved by strong acid, it is preferred that the thickness thereof is 130˜250 μm.
The compositions of the conductive lines 111 and 112 are mixed with a CNT (Carbon Nano Tube) dispersion which has conductivity, and an acryl alkyd resin mixed with a volatile solvent. In this case, 60˜90% by weight of the CNT dispersion and 10˜50% by weight of acryl alkyd resin mixed with a volatile solvent are mixed, thus preparing a CNT ink, and the thusly prepared CNT ink is printed on the base film layer 110 by the gravure printing method, thus forming the conductive lines 111 and 112.
Here, the acryl alkyd resin mixture is formed of 40˜60% by weight of acryl alkyd resin and 40˜60% by weight of a volatile solvent. The acryl alkyd resin is strong to strong acid and has a strong adhering power when printing. The volatile solvent allows to increase volatile when printing, thus making easy the printing work.
The CNT dispersion is prepared in a paste form in the way that the total 85% by weight is calculated as 100% by weight, and within the amount of the thusly calculated 100% by weight, 1˜10% by weight of the CNT powder, 80˜98% by weight of ethyl cellosolve solvent and 1˜10% by weight of nonionic surfactant dispersion are mixed. The CNT powder has conductivity, and the ethyl cellosolve solvent and the nonionic surfactant dispersion allow to stabilize the structures of the carbon nano tube (CNT), while making particles uniform.
The CNT ink mixed with the CNT dispersion and the acryl alkyd resin mixture is printed by the gravure printing method, thus forming conductive lines 111 and 112. At this time, the thickness of each conductive line 111 and 112 is 8˜12 μm.
The upper side protection film layer 120 is formed of a synthetic resin, for example, PC, PP, PE, PET, Teflon material, etc. which are strong to strongly acidic solution, and the thickness of the upper side protection film layer 120 is 100˜250 μm.
Like the base film layer 110, if the upper side protection film layer 120 is is formed of PC, PP, PTFE, etc. which are not easily dissolved by strong acid, it is preferred that the thickness thereof is 100˜130 μm, and if the upper side protection film layer 120 is formed of a synthetic resin, for example, PE, PET, etc. which are easily dissolved by strong acid, it is preferred that the thickness thereof is 130˜250 μm.
Therefore, if a strongly acid solution leaks, the strong acid solution is inputted through the sensing holes 131 formed where the leakage had occurred, so the two conductive lines 111 and 112 become conductive, which causes a change in resistance values.
Therefore, the distant controller will receive such a change in the resistance value in the conductive states, thus checking any leakage of the strongly acidic solution.
As illustrated in
Therefore, if water inputs, the conductive lines 111 and 112 don't become conductive with the aid of the coating layer 200. Only when a strongly acidic is solution inputs, the coating layer 200 is dissolved, and the conductive lines 111 and 112 printed by the CNT ink expose and become conductive, thus detecting any leakage of the strongly acidic solution.
At this time, the thickness of the coating layer 200 is 16˜18 μm.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2013-0012288 | Feb 2013 | KR | national |
| 10-2013-0113039 | Sep 2013 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2014/000932 | 2/4/2014 | WO | 00 |
