KR20090130750A - Salt patch - Google Patents

Abstract

PURPOSE: A patch measuring salinity is provided to correctly measure the salinity by preventing the leakage due to the poor attachment. CONSTITUTION: A patch measuring salinity comprises a foam layer(110), a film layer(120) and bonding layers(131,132). The foam layer is attached to a measurement object structure. The foam layer comprises a space filled with distilled water to measure the salinity. The film layer is attached on top of the foam layer in order to shut tightly the space. The bonding layer is included in the upper side and bottom surface of the foam layer. The foam layer is made of at least one of polyethylene films and located on top of a polyethylene form(112) of closed cell. The film layer is included of the polyurethane film.

Description

Salinity Patch {Salt patch}

The present invention relates to a salinity measuring patch, and more particularly to a salinity measuring patch for measuring the surface salinity of the iron structure before coating the steel structure.

In general, steel structures such as large ships, offshore structures, and plant facilities are coated to prevent corrosion. In particular, in order to prevent corrosion of the steel structure in each drying process, ships are strictly regulated for each process.

On the other hand, since various foreign substances such as salt and dust can be attached to the surface of the steel structure, the acceptance criteria for each foreign substance before painting are suggested. If the coating is performed while a small amount of salt remains on the surface, the coating film swelling due to osmotic pressure may cause premature breakage of the coating film, and rust may occur on the surface of the steel structure body under the coating film. As a result, the durability of the steel structure is consequently deteriorated. Therefore, after measuring the surface salinity attached to the surface of the steel structure before painting, the surface salinity is removed to below the prescribed value by using a method such as washing or blasting, and then painting work. Will be implemented.

As described above, in order to measure the amount of salt on the surface of the iron structure, a conventional Bressel patch is used.

However, conventionally used Bressel patches have the following problems.

First, the patch used for salinity measurement is a one-time use, in spite of being a consumable item, it is inexpensive at an expensive price.

Second, since the residue remains after removing the patch, the work efficiency is deteriorated due to the grinding operation, which is a separate residue removal operation.

Third, the amount of ion elution of the patch itself is too high, which reduces the accuracy of the measured value.

Fourth, water leakage occurs due to poor adhesion between the metal body and the foam when measuring in winter.

The present invention has been made in view of the above problems, and an object of the present invention is to leave no foam residue after removing the patch, to leak the needle injection unit, to have excellent water-tightness, and to have very low ion dissolution of the patch itself, and thus more accurate salt content. It is possible to measure, and to provide a salinity measurement patch that can be used in the winter without leakage due to poor adhesion.

Salinity patch of the present invention to achieve the object as described above and to perform the task for removing the conventional defects is attached to the structure to be measured and the foam layer having a space filled with distilled water for the measurement of salinity, and In the patch for salinity measurement comprising a film layer attached to the top of the foam layer to seal the space provided in the foam layer, and an adhesive layer provided on the upper and lower surfaces of the foam layer, the foam layer is 80kg / ㎥ ~ 130㎏ / ㎥ The polyethylene layer made of at least one polyethylene film is installed on the polyethylene foam of the porous closed cell structure having a density range, characterized in that the double structure.

On the other hand, the film layer may be made of a polyurethane film or a polyurethane and latex composite film, in this case, the polyurethane and latex composite film after washing with distilled water, it is preferable to attach to the foam layer.

According to the present invention having the above characteristics, there is no foam residue after the patch is removed, there is no leakage of the needle injection portion, excellent water tightness and very low ion elution of the patch itself has the effect of more accurate measurement of salinity It is now possible to provide salinity patches.

Moreover, localization has made it possible to provide low-cost salinity patches.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is an exploded perspective view of a salinity patch according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional view of the salinity patch shown in FIG.

Salinity measurement patch according to a preferred embodiment of the present invention is composed of a foam layer 110, a film layer 120 and the adhesive layer (131, 132) and a liner 140, the salinity patch of this configuration is a conventional Bressel patch Although there are similar parts in terms of structure, this is due to the simple structure of the patch itself, but inevitably similar to the basic structure, the salinity patch according to the present invention is the foam layer 110 and the film layer 120 In the following, the following characteristic structures are provided.

The foam layer 110 is formed in a flat structure having a predetermined thickness, and the center portion is provided with a space 111 into which distilled water is injected for measuring salinity. In this case, the space 111 is formed to have a structure penetrating the upper and lower surfaces of the foam layer 110, the distilled water injected into the formed space 111 is in contact with a predetermined surface area of the base to be measured. Meanwhile, although the foam layer 110 and the film layer 120 having a rectangular structure are shown in FIG. 1, the present invention is not limited thereto and may be formed in a circular or other shape.

The foam layer 110 having the structure as described above is composed of a double structure in which the polyethylene layer 113 is stacked on the high density polyethylene foam 112. At this time, the high-density polyethylene foam 112 is made of a porous closed cell (foamed cell) foam having a density range of 80 ㎏ / ㎥ ~ 130 ㎏ / ㎥, the polyethylene layer 113 has a dense structure so that no pores It consists of laminated | stacked at least one polyethylene film. Since the polyethylene foam 112 and the polyethylene layer 113 can be bonded to each other by a known heat fusion method to form the foam layer 110, for the method of combining the polyethylene foam 112 and polyethylene layer 113 Detailed description will be omitted. In addition, at least one or more sheets mentioned above means that the polyethylene layer may be composed of one sheet of polyethylene film, or may be composed of a plurality of layers of polyethylene film.

Meanwhile, in the case of the conventional Bressel patch, since it is made of polyethylene foam with a density range of 60㎏ / ㎥ ~ 70㎏ / ㎥, it is more likely to leak at the needle part during the measurement, and also due to the tearing of the foam when removing the patch. Due to the residue left behind. On the other hand, the foam layer 110 of the present invention is a double structure in which the polyethylene layer 113 is stacked on top of the polyethylene foam 112 in a porous closed cell having a density range of 80 kg / m 3 to 130 kg / m 3. As a result, after the removal of the needle used for the injection of distilled water, the portion into which the needle is inserted is restored while being naturally pressed, there is an advantage of preventing leakage of distilled water.

On the other hand, the density of the polyethylene foam 112 adhered to the measurement target is a very important factor in the presence of foam residue when the patch is removed, and the conventional Bressel patch has a relatively low density of 60㎏ / ㎥ ~ 70㎏ / ㎥ As a result, when the patch is removed, the foam is not able to withstand the force applied to the inside of the foam, and thus a lot of residue remains. On the contrary, if the density is too high, injection of the syringe needle is quite difficult, and there is a possibility of leakage between the measurement base and the foam. It is fixed by applying a considerable force with your finger to the needle inlet during measurement. A certain amount of this force must be absorbed by the foam to prevent peeling between the foam and the body.However, if the density is too high, the distilled water of the syringe should be repeated during measurement. In the process of injecting and removing, peeling phenomenon occurs at the interface between the body and the foam, which increases the possibility of water leakage.

Therefore, it is preferable that the polyethylene foam 112 adhered to the base to be measured has a density of 80 kg / m 3 to 130 kg / m 3 as described above. Here, '~' used to limit the density range of the polyethylene foam 112 means 80 kg / m 3 or more and 130 kg / m 3 or less.

In addition, the outer edge width b of the foam layer 110 is preferably 5 mm to 10 mm, and the thickness t of the foam layer 110 is preferably 1.5 mm to 2 mm. This is because when the outer edge width of the foam layer 110 is formed to be less than 5 mm, it does not provide sufficient adhesion area, that is, adhesion force with the base or film layer 120, so that leakage may occur during salinity measurement, and may exceed 10 mm. In this case, it is not preferable in terms of product shape or economy.

The film layer 120 is attached to the upper portion of the foam layer 110 to seal the space 111 provided in the foam layer 110, made of a polyurethane film or a synthetic film of polyurethane and latex. For reference, in the case of a conventional Bressel patch, a latex film is used. Here, when the film layer 120 is made of a polyurethane film, the thickness of the film is preferably formed to 100㎛ or less, when the film layer 120 is made of a synthetic film of polyurethane and latex, 200㎛ It is preferable to form below. This means that the film should be sufficiently deformed due to the pressure generated inside the space 111 provided in the foam layer 110 when measuring the surface salinity. If the thickness is exceeded, sufficient deformation may be made to alleviate the internal pressure. Since the peeling or leaking phenomenon may occur between the interface between the film layer 120 and the foam layer 110 or between the foam layer 110 and the base, the thickness of the film layer 120 is preferably formed within the above range. Do. On the other hand, if the thickness of the film is not a problem in the measurement is not particularly limited.

Meanwhile, the above-mentioned synthetic film of polyurethane and latex is composed of aliphatic polyurthane and natural rubber mixed at a ratio of 10:90, and it is durable while maintaining the characteristics of natural rubber. Will be raised.

Meanwhile, in the case of the film layer 120 made of a synthetic film of polyurethane and latex, it is washed with distilled water in order to remove and minimize unnecessary ion elution which decreases the accuracy of surface salinity measurement before attaching to the foam layer 110. do. The polyurethane film can be used without a separate washing process because there is no ion dissolution.

Referring to the process of washing the polyurethane and latex composite film in more detail.

Air blowing → general water washing → ionized water cleaning → deionized water washing → drying

Accurate salinity measurement of the surface of the body requires strict cleanliness control of the component, with no or minimal ion elution from the component. This is because elution of ions affects surface salinity measurements. The reason for the step-by-step cleaning process is to remove unnecessary foreign substances and ions in the film layer 120 in a more economical and efficient manner.

At present, the surface salinity acceptance criteria of ships are very strict, below trace levels of 50 mg / m2. In the case of the conventional Bressel patch up to 40% of the maximum surface salinity limit of the ship due to the excessive elution ion of the latex itself used as a film material of the component, it is difficult to accurately measure the surface salinity. Accordingly, the film layer 120 of the present invention uses a polyurethane film or a polyurethane and latex synthetic film, and in the case of a polyurethane and latex synthetic film, a problem caused by ion dissolution is removed or minimized through a washing process using distilled water. will be.

The adhesive layers 131 and 132 are provided between the foam layer 110 and the film layer 120 and on the bottom surface of the foam layer 110 to bond the foam layer 110 and the film layer 120 to each other. The patch can be attached to the object to be measured. The adhesive used as the adhesive layers 131 and 132 is not specific, and among the various known adhesives, an adhesive capable of firmly attaching a patch may be selected and used. However, the thickness of the adhesive layer (131, 132) is preferably 50㎛ ± 10㎛. This is because when the thickness of the adhesive is increased to increase the adhesive strength, there is a problem that the foam residue remains when the foam is removed.

The liner 140 is attached to the adhesive layers 131 and 132 provided on the bottom of the foam layer 110 to protect the adhesive layers 131 and 132 when the patch is not used. Of course, the liner 140 attached to the bottom of the foam layer 110 is removed from the foam layer 110 upon attachment of the patch.

Meanwhile, the foam block 150 may be further provided to prevent deformation of the patch when the patch is not used. In the case of the foam layer 110, since an empty space 111 is formed in the center thereof, a problem such as being easily deformed or folded even under a weak force is caused, so that filling the space 111 when the patch is not in use prevents the deformation of the patch. desirable. Accordingly, the foam block 150 has the same shape as the space 111 so that the foam block 150 can be accurately fitted into the space 111 formed in the foam layer 110, and prevents adhesion of the foam block 150 to the film layer 120. The liner 151 to facilitate the removal of the foam block 150 is configured to be provided on the upper surface.

Figure 3 is a photograph taken the salinity measurement procedure using the salinity measurement patch of the present invention, Figure 4 is a photograph taken a residue state according to the density of the foam.

The present invention configured as described above is carried out by measuring the salinity of the surface of the structure using a salinity measurement patch by the same method as in the prior art, which will be briefly described as follows.

1. Fill 15 ml distilled water in a 25 ml beaker.

2. Measure and record the initial conductivity of distilled water.

3. Attach the salinity patch to the structure to be measured.

4. Collect 5 ml of distilled water from the beaker using a syringe from 15 ml of distilled water.

5. Insert the needle of the syringe into the salinity patch attached.

6. Inject 5 ml distilled water from the syringe into the patch.

7. Inhale the distilled water in the patch again with a syringe.

8. Repeat steps 6 and 7 5 times per minute for 5 minutes.

9. Recover distilled water from the patch and refill it in the beaker.

10. Measure and record the electrical conductivity of the collected solution.

11. Use the following formula-1 to calculate the surface salinity from the initial conductivity and the measured conductivity.

Surface Salinity (mg / ㎡) = 6 × (Measurement Conductivity-Initial Conductivity)

When using the salinity measurement patch of the present invention, no leakage occurs due to the high density polyethylene foam 112 and polyethylene layer 113 during injection and recovery of distilled water using a syringe, and furthermore, polyurethane film or polyurethane and latex. Since the amount of ion elution generated from the film layer 120 made of a synthetic film is fine or fine, more accurate measurement value can be obtained, and due to the high density of the foam layer 110, there is an advantage that no foam residue remains when the patch is removed.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is a perspective view of a salinity patch according to a preferred embodiment of the present invention,

2 is a cross-sectional view of the salinity patch according to a preferred embodiment of the present invention,

3 is a photograph taken the salinity measurement procedure using the salinity patch of the present invention,

Figure 4 is a photograph taken of the residue state according to the density of the foam.

<Explanation of symbols for the main parts of the drawings>

(110): foam layer (111): space

(112): Polyethylene Foam (113): Polyethylene Layer

120: film layer 131, 132: adhesive layer

140: liner 150: foam block

151: Liner

Claims (3)

The foam layer 110 is attached to the structure to be measured and provided with a space 111 filled with distilled water for measuring salinity, and the upper portion of the foam layer 110 to seal the space 111 provided in the foam layer 110. In the salinity measurement patch having an attached film layer 120, and the adhesive layer (131, 132) provided on the top and bottom surfaces of the foam layer 110, The foam layer 110 is provided with a polyethylene layer 113 made of at least one polyethylene film on top of the polyethylene foam 112 of a porous closed cell having a density range of 80 ㎏ / ㎥ ~ 130 ㎏ / ㎥ Salinity patch, characterized in that consisting of a double structure. The method of claim 1, The film layer 120 is a salinity patch, characterized in that consisting of a polyurethane film. The method of claim 1, The film layer 120 is made of polyurethane and latex composite film, The polyurethane and latex synthetic film is a salinity patch, characterized in that attached to the foam layer 110 after the washing process with distilled water.

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