KR102261676B1 - Eleconductive coating composition for absorbent article and method for manufacturing absorbent article using the same - Google Patents

Abstract

The present invention relates to a conductive coating composition for an absorbent article and a method for manufacturing an absorbent article using the same, and more particularly, the present invention relates to a method for detecting excretion under various use environments such as moisture, salt, excretion and excretion caused by excretion in an absorbent article. It relates to a conductive coating composition for an absorbent article capable of preventing deterioration of electrical properties of the conductive pattern, and a method for manufacturing an absorbent article comprising the step of using the same to form a conductive pattern in the absorbent article.

Description

Conductive coating composition for absorbent article and method for making absorbent article using same {ELECONDUCTIVE COATING COMPOSITION FOR ABSORBENT ARTICLE AND METHOD FOR MANUFACTURING ABSORBENT ARTICLE USING THE SAME}

The present invention relates to a conductive coating composition for an absorbent article and a method for manufacturing an absorbent article using the same, and more particularly, the present invention relates to a method for detecting excretion under various use environments such as moisture, salt, excretion and excretion caused by excretion in an absorbent article. It relates to a conductive coating composition for an absorbent article capable of preventing deterioration of electrical properties of the conductive pattern, and a method for manufacturing an absorbent article comprising the step of using the same to form a conductive pattern in the absorbent article.

Diapers are absorbent articles used by the elderly, physically handicapped, and the like, and include disposable diapers, training pants, incontinence pants, and the like. All of these absorbent articles are used differently depending on the wearer's lifestyle and nursing level.

For example, a disposable diaper is used as an auxiliary tool for excretion or as a hygiene product for nursing care by holding and absorbing the excrement without leaking it to a person having difficulty in excreting by oneself, such as an elderly person or a physically handicapped person.

Urine can be an important data to determine the user's health status. Therefore, there is a need for a means for detecting and managing a user's urine and a method for manufacturing the means.

Korea Patent Publication No. 10-1246464 discloses a disposable diaper that can easily take out a main part of a man, but a means for managing urine and a method for manufacturing the means are not shown.

Korean Patent Publication No. 10-1246464

Under the above technical background, an object of the present invention is to provide a conductive coating composition for forming a conductive pattern for detecting excretion under various use environments such as moisture, salt, excretion and excretion due to excretion in an absorbent article.

In particular, the conductive pattern for detecting excretion formed by the conductive coating composition detects the user's excretion through an electrical signal that is changed by factors such as moisture, salt, secretion and excretion caused by excretion in the absorbent article based on electrical conductivity. do.

At this time, when the conductive pattern for detecting excretion formed by the conductive coating composition increases the resistance value of the conductive pattern for detecting excretion under various usage environments as well as factors such as moisture, salt, secretion and excretion due to excretion in the absorbent article. If there is a change in electrical conductivity, such as

Accordingly, the present invention provides a conductive coating composition capable of minimizing changes in the electrical properties of the conductive pattern for detecting excretion under various use environments as well as factors such as moisture, salt, secretion and excretion due to excretion in an absorbent article. for that purpose

In addition, the present invention includes the step of forming a conductive pattern in an absorbent article by using the conductive coating composition, so that the change in electrical properties of the conductive pattern for detection of excretion is minimized under various use environments, and thus excretion with high accuracy and reliability It aims to provide a method of making an absorbent article capable of providing a sensing result.

In order to solve the above technical problem, according to one aspect of the present invention, a conductive polymer comprising poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound, a crosslinking agent and a solvent A conductive coating composition for an absorbent article comprising

According to the above aspect, as the conductive pattern in the absorbent article is formed using a conductive polymer including poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound, the conductive pattern is It is possible to improve the adhesion between the formed substrate and the conductive pattern. In addition, it is possible to minimize changes in electrical properties of the conductive pattern for detecting excretion under various use environments other than factors such as moisture, salt, excretion and excretion due to excretion in the absorbent article.

In addition, according to another aspect of the present invention, a conductive pattern for generating an electrical signal capable of detecting excrement on one surface of the substrate in which the passage of excrement is at least partially restricted is formed according to any one of claims 1 to 5. A method of making an absorbent article can be provided comprising forming into a coating composition.

According to the present invention, when a conductive polymer containing poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound is used to form a conductive pattern in an absorbent article, it is generally hydrophobic. It is possible to improve the adhesion of the conductive pattern to the surface of a substrate for an absorbent article having a surface.

Accordingly, it is possible to prevent in advance the problem of inaccurate sensing results due to the separation of the conductive pattern from the substrate under various use environments other than factors such as moisture, salt, secretion and excretion due to excretion in the absorbent article. .

In addition, when a conductive polymer including poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound according to the present invention is used, pretreatment for improving the hydrophilicity of the hydrophobic surface of the substrate It is possible to improve the adhesion of the conductive pattern to the substrate without (eg, corona discharge treatment, etc.), thereby reducing the complexity of the manufacturing process.

In addition, according to the present invention, high accuracy and reliability are achieved by minimizing the change in the electrical properties of the conductive pattern for excretion detection under various use environments as well as factors such as moisture, salt, secretion and excretion due to excretion in the absorbent article. It is possible to provide excretion detection results with

1 schematically illustrates a cross-section of an absorbent article made in accordance with an embodiment of the present invention.
2 schematically shows a manufacturing apparatus in which a method for manufacturing an absorbent article according to an embodiment of the present invention is performed.
3 schematically shows a manufacturing apparatus in which a method for manufacturing an absorbent article according to another embodiment of the present invention is performed.

In order to better understand the present invention, certain terms are defined herein for convenience. Unless defined otherwise herein, scientific and technical terms used herein shall have the meanings commonly understood by one of ordinary skill in the art. Also, unless the context specifically dictates otherwise, it is to be understood that a term in the singular includes its plural form as well, and a term in the plural form also includes its singular form.

Hereinafter, a conductive coating composition for an absorbent article according to some embodiments of the present invention and a method of manufacturing an absorbent article using the conductive coating composition for an absorbent article according to some embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

According to one aspect of the present invention, there is provided a method of manufacturing an absorbent article comprising the step of forming a conductive pattern for generating an electrical signal capable of detecting excrement on one surface of a substrate through which passage of excrement is at least partially restricted with a conductive coating composition do.

The absorbent article is an article for absorbing the user's excrement, and the user's excrement may be feces, urine, sweat, menstrual blood, tears or saliva. The absorbent article for absorbing excretion includes a diaper or pad for absorbing feces and urine, a patch attached to a specific location on the body to absorb sweat, a sanitary napkin for absorbing menstrual blood, an eye patch for absorbing tears or a mask for absorbing saliva, and the like; It can be provided in various usage modes as such. In addition, the absorbent article may be provided for use in humans as well as companion animals.

As a conductive pattern capable of detecting excrement such as feces, urine, sweat, menstrual blood, tears or saliva is formed on one surface of the substrate used in the absorbent article, an electrical signal is generated when excretion is absorbed to automatically determine whether excrement is absorbed. (e.g., a computerized system) can be made to be verifiable.

1 schematically illustrates a cross-section of an absorbent article made in accordance with an embodiment of the present invention.

Referring to FIG. 1 , an embossed pattern 111 having a predetermined height t2 may be provided on one surface of the substrate 110 having a predetermined thickness t1, and the embossed pattern 111 may have a predetermined height t2. may be matched with an interval t3 of .

At this time, it is preferable that the embossed patterns 111 representing the spacing t3 between the adjacent embossed patterns 111 are provided with an interval of 50 mesh or more to less than 300 mesh. In addition, the height (t2) of the embossed pattern is preferably 0.10 to 0.66 compared to the thickness (t1) of the substrate.

The embossed pattern 111 formed on one surface of the substrate 110 has an effect of widening the contact area of the substrate 110 with respect to the conductive pattern 200 , and is formed on one surface of the substrate 110 . By increasing the amount of impregnation of the conductive coating composition for the conductive pattern 200 as a result, it is possible to improve the electrical conductivity of the conductive pattern (200).

At this time, when the interval of the embossed pattern 111 is less than 50 mesh or the height t2 of the embossed pattern 111 is less than 0.10 compared to the thickness t1 of the substrate 110, the conductive pattern 200 is Since the contact area of the substrate 110 to the substrate 110 is relatively narrow, and there is a limitation to increase the impregnation amount of the conductive coating composition, the resistance value of the conductive pattern increases, so that electrical conductivity may be insufficient.

On the other hand, when the interval of the embossed pattern 111 is 300 mesh or more or the height t2 of the embossed pattern 111 exceeds 0.66 compared to the thickness t1 of the substrate 110, the conductive coating composition As the impregnation amount is excessively increased, the drying time required for drying the conductive coating composition to form the conductive pattern 200 is inevitably extended, and in this case, shrinkage of the substrate due to heat occurs, causing defects in the absorbent article. there is a risk of doing

More specifically, the method of making the absorbent article comprises the steps of: (a) unwinding the substrate from a source roll wound with a substrate having at least partially restricted passage of the excrement; (b) removing the excrement from a surface of the substrate unwound from the source roll. Forming a conductive pattern with a conductive coating composition through which a sensing signal can communicate, and (c) winding the substrate on which the conductive pattern is formed to form a winding roll.

The substrate used in the absorbent article is generally formed in a plate shape, and may be prepared from a material such as vinyl or film (eg, polyolefin film) that is at least partially restricted to the passage of excreta.

In addition, the substrate may be provided as a breathable film or a non-breathable film. Such a breathable or non-breathable film may be provided as a so-called diaper film. The diaper film may be provided as a copolymer obtained by copolymerizing 70 to 90 parts by weight of polyethylene, 5 to 30 parts by weight of polypropylene, and 1 to 30 parts by weight of alkene (butene, hexene and/or octene).

The method of making an absorbent article according to the present disclosure can be arranged as a roll-to-roll system for the implementation of a continuous system for making an absorbent article. To this end, the substrate may be provided in a state wound by a predetermined length on a source roll.

The substrate continuously unwound in step (a) may be transferred to a conductive pattern part in which step (b) is performed, and the conductive pattern part may be disposed between the source roll and the take-up roll.

Before performing step (b) with respect to one surface of the substrate unwound in step (a), corona discharge treatment may be performed on one surface of the substrate on which the conductive pattern is formed.

The corona discharge treatment described above may be performed by a discharge treatment unit provided between the source roll and the conductive pattern unit. One surface of the substrate on which the conductive pattern is formed may be surface-modified by corona discharge treatment performed by the discharge treatment unit, and more specifically, one surface of the substrate on which the conductive pattern is formed by the corona discharge treatment. surface tension can be improved. Accordingly, as the coating property of the conductive coating composition on one surface of the surface-modified substrate is improved, adhesion and durability of the conductive pattern to the substrate may be improved.

Then, in the step (b), a conductive pattern is formed by coating a conductive coating composition on a predetermined area of one surface of the selectively corona-discharge-treated substrate.

The conductive pattern is formed to have a specific pattern in a region partitioned on one surface of the substrate, thereby causing a change in an electrical signal (eg, current value, resistance value, etc.) when excrement comes into contact with the conductive pattern, In this way, whether the excreta is absorbed can be checked automatically (eg, a computerized system).

The conductive pattern may be continuously formed on one surface of the substrate as the substrate in a state of being continuously unwound from the source roll continuously passes through the conductive pattern part.

Here, the conductive coating composition for forming the conductive pattern on one surface of the substrate is a conductive polymer containing poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound, a crosslinking agent and solvents.

The conductive pattern for detecting excretion formed by the conductive coating composition detects the user's excretion through an electrical signal that is changed by factors such as moisture, salt, excretion and excretion due to excretion in the absorbent article based on electrical conductivity.

At this time, when the conductive pattern for detecting excretion formed by the conductive coating composition increases the resistance value of the conductive pattern for detecting excretion under various usage environments as well as factors such as moisture, salt, secretion and excretion due to excretion in the absorbent article. If there is a change in electrical conductivity, such as

Accordingly, the conductive coating composition, in particular, the conductive polymer included in the conductive coating composition is used for the electrical conductivity of the conductive pattern for excretion detection under various usage environments as well as factors such as moisture, salt, secretion and excretion due to excretion in the absorbent article. It is necessary to minimize the characteristic change.

To this end, according to the present invention, poly-3,4-ethylenedioxythiophene-polystyrenesulfonate, which is generally used as a conductive polymer, is modified with a catecholamine-based compound to form a conductive pattern. characterized in that

In general, even if a substrate having a hydrophobic surface is subjected to corona discharge treatment before forming the conductive pattern, the effect of increasing the surface tension (hydrophilicity) of one surface of the substrate by this pretreatment is temporary, so after forming the conductive pattern, As time passes, the effect of the pretreatment may decrease, which may cause a problem in that the electrical conductivity and/or durability of the conductive pattern is deteriorated under various use environments of the absorbent article.

At this time, when poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a catecholamine-based compound in the present invention is used as a conductive material, the catecholamine-based compound itself is The adhesion of the conductive pattern to the surface of the substrate may be improved regardless of the chemical properties of the surface of the substrate. In addition, since the poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound coated on one surface of the substrate still has a surface catechol functional group, adhesion to other conductive materials It is possible to form a more robust conductive pattern through the properties.

Accordingly, if necessary, as a conductive material other than the poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with the cathecholamine-based compound, a transparent conductive oxide, a carbonaceous conductive material, a conductive polymer (poly-3 , 4-ethylenedioxythiophene-polystyrene sulfonate (except polystyrene sulfonate) and may further include at least one selected from a metallic material.

Examples of transparent conductive oxides include ITO (Indium Tin Oxide), ICO (Indium Cerium Oxide), IWO (Indium Tungsten Oxide), ZITO (Zinc Indium Tin Oxide), ZIO (Zinc Indium Oxide), ZTO (Zinc Tin Oxide), GITO ( Gallium Indium Tin Oxide), Gallium Indium Oxide (GIO), Gallium Zinc Oxide (GZO), Aluminum doped Zinc Oxide (AZO), Fluorine Tin Oxide (FTO), or ZnO may be used.

As the carbonaceous conductive material, graphene or carbon nanotubes may be used, and as the metallic material, a metal thin film having a multilayer structure such as metal nanowires and Au/Ag/Cu/Mg/Mo/Ti may be used. have. Conductive polymers include polyacetylene, polyaniline, polypyrrole, polythiophene, poly-[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA), Spiro-MeOTAD Or polyaniline-camphorsulfonic acid (PANI-CSA) and the like may be used.

The poly-3,4-ethylenedioxythiophene-polystyrene sulfonate may be modified with catecholamine-based compounds as polydopamine, polyepinephrine, polynorepinephrine, and chitosan-catechol ( At least one selected from chitosan-catechol) may be used.

In addition, in order to form a conductive pattern by poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with the cathecholamine-based compound, the pH of the conductive coating composition may be 7.0 or more, preferably 8.5 or more. have. In order to adjust the pH of the conductive coating composition, a pH adjuster such as methyldiethanolamine, buthyldiehanolamine, dimethylaminoethanol, and diehtylethanolamine may be additionally included in the conductive coating composition.

In addition, the conductive coating composition comprises 0.1 wt% to 5 wt% of a binder, 0.1 wt% to 5 wt% of a crosslinking agent, a solvent ( 20 wt% to 50 wt% of alcohol, 20 wt% to 50 wt% of distilled water) and 0.01 wt% to 0.2 wt% of a wetting agent, and the like.

The crosslinking agent may further include at least one crosslinking agent selected from an isocyanate-based compound, a carbodilite-based compound, an aziridine-based compound, and a melamine-based compound.

In addition, if necessary, the conductive coating composition may further include at least one selected from a UV stabilizer, an antioxidant, a colorant, a reinforcing agent, a filler, an antifoaming agent, a surfactant, and a plasticizer.

The conductive coating composition of the above composition uses poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound as a main conductive material to form a conductive pattern in an absorbent article. In addition to factors such as moisture, salt, excretion and excretion, the change in electrical properties of the conductive pattern for detecting excretion can be minimized under various other use environments, and the conductive pattern from the base material due to reduced adhesion of the conductive pattern. This separation problem can be avoided.

The conductive pattern formed by the conductive coating composition may be formed to cover at least a portion of a space between the embossed patterns provided on one surface of the substrate and/or an upper surface of the embossed pattern.

In addition, at least a portion of the conductive pattern formed by partially impregnating the conductive coating composition in the substrate in step (b) may exist in an impregnated state in the substrate. Accordingly, the conductive pattern may be maintained in a more firmly attached state to the substrate.

Referring to step (c), the substrate on which the conductive pattern is formed with the conductive coating composition on one surface may be continuously wound by the winding roll.

At this time, according to the present invention, the electrical conductivity of the conductive pattern is improved through post-treatment before winding the substrate on which the conductive pattern is formed on the winding roll, and the adhesion of the conductive pattern to the substrate is further improved. can

In one embodiment, after coating the conductive coating composition on one surface of the substrate before step (c), it is preferable to dry it within 10 seconds at a temperature of 70°C to 100°C.

The substrate on which the conductive coating composition is coated is vulnerable to high temperature, and thus, when heat-treated at a relatively high temperature for a long time, there is a risk that a defect may occur due to heat shrinkage.

On the other hand, the substrate dried in the above temperature range is preferably cooled to a temperature of at least 45 °C, preferably 40 °C or less, and then wound on the take-up roll. When the substrate on which the conductive pattern is formed is wound on the winding roll without being sufficiently cooled, the conductive pattern formed on one surface of the substrate is in contact with the pressure when the substrate is wound by the winding roll. There is a possibility of transfer to the other side of the substrate.

In a further embodiment, the electrical conductivity of the conductive pattern may be further improved through laser irradiation with respect to the conductive pattern formed by coating the conductive coating composition on one surface of the substrate before the step (c).

In addition to factors such as moisture, salt, excretion and excretion due to excretion, as the resistance of the conductive pattern for excretion detection increases under various other usage environments, the electrical properties may decrease, and in this case, even if excretion is present, sensitive detection may not be possible. Accordingly, by further increasing the electrical conductivity of the conductive pattern through laser irradiation on the conductive pattern, the ability to maintain electrical conductivity of the conductive pattern may be improved.

The amount of laser irradiation for the conductive pattern may be appropriately adjusted according to the thickness of the conductive pattern, the laser wavelength, and the laser irradiation time.

1 schematically shows a manufacturing apparatus in which a method for manufacturing an absorbent article according to an embodiment of the present invention is performed, and FIG. 2 schematically shows a manufacturing apparatus in which a method for manufacturing an absorbent article according to another embodiment of the present invention is performed. will be.

First, referring to FIGS. 1 and 2 , the apparatus for manufacturing an absorbent article is a source roll (a) in which a substrate 110 on which a conductive pattern is formed is repeatedly wound, and is continuously unwound from the source roll (a). A conductive pattern part 310 for coating the conductive coating composition on the substrate 110, a drying part 360 for drying the substrate 110 on which the conductive pattern 200 is formed by the conductive pattern part 310, and and a winding roll (b) for continuously winding the dried substrate 110 . Through the above-described configuration, it is possible to continuously form a conductive pattern capable of detecting excrement on one surface of the substrate 110 .

Also, optionally, a discharge processing unit 380 for performing corona discharge treatment on the substrate 110 may be provided upstream of the conductive pattern unit 310 .

The surface may be modified by the corona discharge treatment performed by the discharge treatment unit 380, and more specifically, the surface tension of one surface of the substrate 110 on which the conductive pattern is formed by the corona discharge treatment is improved. can Accordingly, the coating property of the conductive coating composition on one surface of the surface-modified substrate 100 may be improved, and as a result, the adhesion and durability of the conductive pattern to the substrate 110 may be improved. have.

The substrate 110 supplied in a wound state around the source roll (a) may be continuously released from the source roll (a) and selectively passed through the discharge processing unit 380 , and then transferred to the conductive pattern unit 310 . can be The conductive pattern part 310 may be provided as a gravure rotary press having a cylindrical shape.

A first storage tank 330 in which the conductive coating composition 10 is accommodated may be provided at the lower end of the conductive pattern part 310 , and as the conductive pattern part 310 rotates, the conductive pattern part 310 is The conductive coating composition 10 accommodated in the first storage tank 330 may be in contact with the outer circumferential surface. At this time, a trench 319 corresponding to the conductive pattern 200 to be formed on one surface of the substrate 110 may be provided on the outer peripheral surface of the conductive pattern part 310, and the conductive coating composition 10 is The trench 319 may be selectively impregnated.

In particular, so that the conductive coating composition 10 can be selectively impregnated in the trench 319 provided on the outer peripheral surface of the conductive pattern part 310, the blade 340 in contact with the outer peripheral surface of the conductive pattern part 310 is can be provided. As the outer circumferential surface of the conductive pattern part 310 rotates while in contact with the blade 340, the conductive coating composition 10 deposited on areas other than the trench 319 is removed by removing the conductive coating composition 10 only in the trench 319. It allows the coating composition 10 to be selectively impregnated.

In addition, a sub-gravure webbing machine 320 may be provided in a region opposite to the conductive pattern unit 310 , and the substrate 110 continuously operates the conductive pattern unit 310 and the sub-gravure web site 320 . As it passes, the conductive pattern 200 may be continuously formed on one surface.

Subsequently, the substrate 110 on which the conductive pattern 200 is formed on one surface may be transferred in the direction of the winding roll b by driving a plurality of rollers.

At this time, optionally, at least one pressure roller or expander roller 350 may be provided between the conductive pattern part 310 and the winding roll b. The pressure roller or expander roller 350 extends the substrate 110 on which the conductive pattern 200 is formed to prevent wrinkles from occurring during the transport process.

Display parts 410 and 420 for forming the display line 300 on one surface of the substrate 110 on which the conductive pattern 200 is formed may be provided downstream of the conductive pattern part 310 .

The display line 300 is a mark provided so that excretion can be detected with the naked eye by discoloration when excrement is buried, and may contribute to improving the accuracy of excretion detection by the absorbent article together with the conductive pattern 200 .

The display units 410 and 420 may be provided as a cylindrical gravure rotary press.

A second storage tank 430 accommodating the color-changing ink composition 20 for forming a display line may be provided at a lower end of the first display unit 410 , and as the first display unit 410 rotates, the first display unit The color-changing ink composition 20 accommodated in the second storage tank 430 may be in contact with the outer peripheral surface of the 410 . At this time, although not shown separately, a trench corresponding to the display line 300 to be formed on one surface of the substrate 110 may be provided on the outer circumferential surface of the first display unit 410 , and the color-changing ink composition 20 . may be selectively impregnated into the trench.

In particular, so that the color-changing ink composition 10 can be selectively impregnated in the trench provided on the outer circumferential surface of the first display unit 410, a blade 440 in contact with the outer circumferential surface of the first display unit 410 may be provided. have. As the outer circumferential surface of the first display unit 410 rotates while in contact with the blade 440, the color-changing ink composition 20 is removed only in the trench by removing the color-changing ink composition 20 deposited in areas other than the trench. to be selectively impregnated.

In addition, a second display unit 420 may be provided in an area opposite to the first display unit 410 , and the substrate 110 continuously displays the first display unit 410 and the second display unit 420 . As it passes, the display line 300 may be continuously formed on one surface.

In addition, optionally, downstream of the conductive pattern part 310 and upstream of the drying part 360 in order to improve the electrical conductivity of the conductive pattern 200 formed on one surface of the substrate 110 . ) may be provided with a laser irradiation unit 370 .

The laser irradiation unit 370 performs selective laser irradiation on the conductive pattern, and the amount of laser irradiation by the laser irradiation unit 370 may be appropriately adjusted according to the thickness of the conductive pattern, laser wavelength, and laser irradiation time. However, when the amount of laser irradiation to the conductive pattern 200 is excessively increased, there is a risk that electrical conductivity may be rather reduced.

Optionally, a conductive pattern 200 and a display line 300 may be formed on one surface of the substrate 110 dried after laser irradiation, and a slitting part 390 before being continuously wound by the winding roll b. ) can be cut by a certain length.

Hereinafter, specific embodiments of the present invention are presented. However, the examples described below are only for specifically illustrating or explaining the present invention, and the present invention is not limited thereto.

Preparation of Conductive Coating Composition

Example

Dopamine hydrochloride (2 mg/ml) was dissolved in 10 mM Tris-HCl (pH 8.5) and mixed with 1.5wt% PEDOT:PSS aqueous solution to prepare a mixed solution containing polydopamine-modified PEDOT:PSS. At this time, DMEOA (2-Dimethylaminoethanol) was added to basify the acidity caused by PEDOT:PSS (pH 2), and the pH was maintained at 8.5.

6% by weight of acrylic-urethane copolymer binder, 0.05% by weight of wetting agent, 0.3% by weight of olefinic surface slip control additive, 8% by weight of distilled water, and 25.65% by weight of isopropyl alcohol were mixed with 60% by weight of the mixed solution prepared by the above method After that, the mixture was stirred at 600 rpm for 5 minutes.

Then, the mixed solution was filtered with a ^{2 kg/cm 2} differential pressure using a cartridge filter (100% polypropylene, pore 1 μm).

comparative example

Unlike the Example, Pristine PEDOT:PSS was used, and thus a conductive coating composition of the same composition as in Example was prepared except that the pH was not adjusted using a separate pH adjuster /

Durability evaluation of conductive patterns

The conductive coating compositions according to Examples and Comparative Examples were dried at 85° C. for 10 seconds after forming a conductive pattern with a width of 1 cm on the surface of a 45 μm-thick DIAPER film, respectively.

Immediately after forming the conductive pattern with the conductive coating composition according to the Examples and Comparative Examples, the resistance of the conductive pattern formed at a predetermined interval was measured using a multi-meter (Fluke).

Then, the DIAPER film on which the conductive pattern is formed is immersed in physiological saline (0.9% NaCl) for 5 hours and 10 hours, respectively, and then taken out and the resistance to the conductive pattern formed at a predetermined interval is measured with a multi-meter (Fluke Corporation). ) was used for measurement.

The experimental results are shown in Tables 1 to 3 below. Table 1 below shows the resistance values measured for the conductive pattern formed at a predetermined interval immediately after forming the conductive pattern with the conductive coating composition according to the Examples and Comparative Examples, and Table 2 below shows the conductive pattern formed Each DIAPER film is immersed in physiological saline (0.9% NaCl) for 5 hours and then taken out and shows the measured resistance values for the conductive patterns formed at a predetermined interval, and Table 3 below shows the diapers on which the conductive patterns are formed Each of the DIAPER films was immersed in physiological saline (0.9% NaCl) for 10 hours and then taken out, and the measured resistance value for the conductive pattern formed at a predetermined interval is shown.

division Resistance (kΩ) comparative example Example 5 cm spacing 35-50 45~55 10 cm spacing 80-95 100~110 15 cm spacing 120-140 140-170 20 cm spacing 160-180 180-220

division Resistance (kΩ) comparative example Example 5 cm spacing 175-250 67-83 10 cm spacing 400-475 150-165 15 cm spacing 600-700 210~255 20 cm spacing 800-900 270-330

division Resistance (kΩ) comparative example Example 5 cm spacing 595 to 850 90 to 110 10 cm spacing 1360 ~ 1615 200 to 220 15 cm spacing 2040 to 2380 280 to 340 20 cm spacing 2720 ~ 3060 360 to 440

Referring to the results of Tables 1 to 3, there was no significant difference in resistance values measured immediately after forming a conductive pattern using the conductive coating compositions according to Examples and Comparative Examples.

However, in the case of a conductive pattern formed using the conductive coating composition according to the comparative example, as the time immersed in physiological saline increases, the resistance of the conductive pattern increases and electrical conductivity decreases, while the conductive coating composition according to the embodiment In the case of the conductive pattern formed using the , it was confirmed that the decrease in electrical conductivity was relatively small compared to the comparative example.

Characteristic evaluation according to the spacing of the embossed pattern formed on the surface of the substrate

The conductive coating composition according to the example was dried at 85° C. after forming a conductive pattern with a width of 1 cm on the surface of a DIAPER film having an embossed pattern formed at different intervals from each other.

After each conductive pattern was formed on a DIAPER film having an embossed pattern formed at different intervals, the drying time was measured, and the resistance to the conductive pattern formed at a predetermined interval immediately after drying was measured with a multi-meter. (Fluke) was used for measurement.

In addition, by measuring the amount of change in the width of the DIAPER film immediately after drying, it was confirmed whether shrinkage due to heat applied during drying. When the width variation of the DIAPER film before and after drying was 5% or more, it was determined that the heat shrinkage was poor.

The experimental results are shown in Table 4 below.

emboss spacing 30 100 130 160 300 10 cm spacing
(kΩ) 270 to 330 100~125 80-95 65-80 50 to 60 20 cm spacing
(kΩ) 370 to 450 205-235 160-180 130-150 100-120 85℃
drying time 3 seconds 6 seconds 8 seconds 10 seconds 20 seconds poor heat shrinkage no shrinkage
(Good) no shrinkage
(Good) no shrinkage
(Good) no shrinkage
(Good) shrinkage
(bad)

Referring to the results in Table 4, when the interval between the embossed patterns formed on the DIAPER film is 300 mesh or more, it can be confirmed that the conductive pattern takes a long time to dry, so that the shrinkage due to the heat applied during drying occurs. . On the other hand, when the interval between the embossed patterns formed on the DIAPER film is less than 50 mesh, it can be confirmed that the electrical conductivity of the conductive pattern is low due to a relatively high resistance value.

Characteristic evaluation according to the height of the substrate emboss pattern

The conductive coating composition according to the embodiment was dried at 85° C. after forming a conductive pattern with a width of 1 cm on the surface of a DIAPER film having embossed patterns of different heights.

After each conductive pattern was formed on a DIAPER film having embossed patterns of different heights, the drying time was measured, and the resistance to the conductive pattern formed at a predetermined interval immediately after drying was measured using a multi-meter (Fluke). g) was used for measurement.

In addition, by measuring the amount of change in the width of the DIAPER film immediately after drying, it was confirmed whether shrinkage due to heat applied during drying. When the width variation of the DIAPER film before and after drying was 5% or more, it was determined that the heat shrinkage was poor.

The experimental results are shown in Table 5 below.

mesh size 130 130 130 130 emboss pattern height 0 10-15 μm 20-25 μm 30-35 μm Emboss pattern height/
substrate thickness 0 0.22~0.33 0.44~0.56 0.67 to 0.78 10 cm spacing (kΩ) 160-190 80-95 64~76 48-57 20 cm spacing (kΩ) 320~360 160-180 128-144 96~108 85℃ drying time 4 seconds 8 seconds 11 seconds 20 seconds poor heat shrinkage no shrinkage
(Good) no shrinkage
(Good) no shrinkage
(Good) shrinkage
(bad)

Referring to the results of Table 5, when the height of the embossed pattern formed on the DIAPER film exceeds 0.66 compared to the thickness of the DIAPER film, the amount of impregnation of the conductive coating composition is excessively increased, so that the conductive pattern It takes a long time to dry, and it can be seen that shrinkage due to heat applied during drying occurs. On the other hand, when the embossed pattern is not formed on the diaper film, it can be confirmed that the electrical conductivity of the conductive pattern is low because the resistance value is relatively high compared to the case where the embossed pattern of a predetermined height is formed.

Evaluation of changes in electrical properties of conductive patterns according to laser irradiation

The conductive coating composition according to the example was dried at 85° C. for 10 seconds after forming a conductive pattern with a width of 1 cm on the surface of each 45 μm-thick DIAPER film.

Immediately after forming the conductive pattern with the conductive coating composition according to the above example, the resistance of the conductive pattern formed at a predetermined interval was measured using a multi-meter (Fluke).

Then, after irradiating a 1070 nm wavelength laser to the conductive pattern formed on the DIAPER film for 10 seconds, the resistance to the conductive pattern formed at a predetermined interval was measured using a multi-meter (Fluke).

The experimental results are shown in Table 6 below.

division Resistance (kΩ) laser irradiation X laser irradiation O 5 cm spacing 35-50 18-25 10 cm spacing 80-95 40-47 15 cm spacing 120-140 60-70 20 cm spacing 160-180 80-90

Referring to the results of Table 6, when a predetermined laser is irradiated to the conductive pattern formed on the DIAPER film, it can be confirmed that the electrical conductivity of the conductive pattern can be further improved.

Above, an embodiment of the present invention has been described, but those of ordinary skill in the art can add, change, delete or add components within the scope that does not depart from the spirit of the present invention described in the claims. It will be said that various modifications and changes of the present invention can be made by, and this is also included within the scope of the present invention.

Claims (15)

On one surface of the substrate,
a conductive polymer including poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound;
crosslinking agent; and
menstruum;
containing,
A conductive pattern formed of a conductive coating composition is provided,
absorbent articles.
According to claim 1,
The catecholamine-based compound is at least one selected from polydopamine, polyepinephrine, polynorepinephrine and chitosan-catechol (chitosan-catechol),
absorbent articles.
According to claim 1,
The pH of the coating composition is 7.0 or more,
absorbent articles.
According to claim 1,
The coating composition further comprises at least one crosslinking agent selected from an isocyanate-based compound, a carbodilite-based compound, an aziridine-based compound, and a melamine-based compound,
absorbent articles.
According to claim 1,
The conductive pattern is formed of a conductive coating composition further comprising at least one conductive material selected from a transparent conductive oxide, a carbonaceous conductive material, a conductive polymer (except PEDOT: PSS), and a metallic material,
absorbent articles.
Comprising the step of forming a conductive pattern for generating an electrical signal that can detect the excrement on one surface of the plate-shaped substrate at least partially restricted passage of excrement with a conductive coating composition,
An embossed pattern is provided on one surface of the substrate on which the conductive pattern is formed,
The conductive pattern is formed to cover at least a portion of a space between the embossed patterns provided on one surface of the substrate and an upper surface of the embossed pattern,
The conductive pattern is
a conductive polymer including poly-3,4-ethylenedioxythiophene-polystyrenesulfonate modified with a cathecholamine-based compound;
crosslinking agent; and
menstruum;
Formed of a conductive coating composition comprising a,
A method of making an absorbent article.
7. The method of claim 6,
The embossed pattern is arranged at intervals of 50 mesh or more to 300 mesh,
A method of making an absorbent article.
delete 8. The method of claim 7,
The height of the emboss pattern relative to the thickness of the substrate is 0.10 to 0.66,
A method of making an absorbent article.
7. The method of claim 6,
The method of making the absorbent article comprises:
(a) unwinding the substrate from a source roll on which the passage of excrement is at least partially restricted;
(b) forming a conductive pattern with the conductive coating composition through which a detection signal of excrement can be communicated on one surface provided with an embossed pattern of the substrate unrolled from the source roll; and
(c) winding the substrate on which the conductive pattern is formed on a winding roll;
A method of making an absorbent article comprising:
11. The method of claim 10,
The step (b) is performed by a conductive pattern part disposed between the source roll and the winding roll,
The substrate continuously passes through the conductive pattern part while being continuously unwound from the source roll,
The conductive pattern is continuously formed by the conductive pattern part on one surface of the substrate continuously passing through the conductive pattern part,
The substrate having the conductive pattern formed on one surface as it passes through the conductive pattern part is continuously wound on the winding roll,
A method of making an absorbent article.
11. The method of claim 10,
Further comprising the step of corona-discharge-treating one surface of the substrate to form the conductive pattern before the step (b),
A method of making an absorbent article.
11. The method of claim 10,
The step (b) is performed so that at least a portion of the conductive pattern is impregnated in the substrate,
A method of making an absorbent article.
11. The method of claim 10,
Further comprising the step of irradiating a laser to the conductive pattern before the step (c),
A method of making an absorbent article.
7. The method of claim 6,
wherein the absorbent article is a diaper, pad, patch, sanitary napkin, eye patch or mask;
A method of making an absorbent article.

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