WO2011074750A1

WO2011074750A1 - Ink composition, a production method for the same and an absorbent sheet comprising the same

Info

Publication number: WO2011074750A1
Application number: PCT/KR2010/003011
Authority: WO
Inventors: 박경수; 문현주; 김봉준
Original assignee: (주)캐어포스트
Priority date: 2009-12-14
Filing date: 2010-05-12
Publication date: 2011-06-23

Abstract

The present invention relates to an ink composition and to a production method for the same, and provided are: an ink composition comprising from 0.001 to 10 wt.% of a pH indicator, from 5 to 35 wt.% of an adsorption agent, from 10 to 30 wt.% of a water-soluble resin, from 35 to 80 wt.% of a solvent which dissolves the water-soluble resin, and from 0 to 15 wt.% of other additives; a production method for the same; and an absorbent sheet comprising the same. The ink composition can be printed onto the surfaces of various objects. Also, with printed layers which have been formed by printing of the ink composition, pH can be measured by means of colour changes through a reaction with aqueous samples even after print drying, and there is little colour bleeding, and there is no decolouration or discolouration of the ink layer after it has been changed by a sample.

Description

Ink composition, preparation method thereof and absorbent sheet comprising same

The present invention relates to an ink composition and a method of manufacturing the same, which is capable of printing on the surface of various objects, and the printing layer formed through the printing of the ink composition can react with an aqueous sample even after printing and drying, so that the color of the printing layer The present invention relates to an ink composition capable of measuring pH by change, having less color bleeding, and having no discoloration or discoloration of an ink layer changed by a sample, and a method of manufacturing the same.

In addition, the present invention relates to an absorbent sheet, which forms a printing layer on the absorbent sheet to measure the pH of the sample, so that the color of the ink layer is small, so that the pH of the sample can be accurately determined, and the printability and color persistence of the ink layer It is excellent, so you can check the measurement result of pH of sample even after time hardening after discoloration.In case of urine as sample, absorbent sheet that can monitor the pH of urine without waiting for defecation time or frequent hospital visit will be.

In order to measure the pH of a sample, generally, a method of titrating a sample with an acidic acid indicator in a laboratory, using a pH meter, and simply testing a litmus paper or a pH stick is used.

All of these methods can be applied when the quantity of sample is sufficient or can be measured in a facility such as a laboratory, or when the result can be checked immediately with the sample prepared.

The use of litmus paper, a relatively simple method, or the use of a stick for pH measurement should also be carried out within a relatively short time to confirm the preservation of the sample and the measurement results.

In particular, when the sample is left unchecked, the sample may be contaminated or changes in ingredients may make pH measurement impossible.If the sample is left for a long time after the sample reacts with the pH indicator, discoloration and discoloration may occur to confirm the pH of the sample. Cases that are difficult to do occur. In particular, when trying to confirm pH by using urine as a sample, the measuring method is problematic.

In the case of diseases of the urinary system, such as cystitis or bladder stones, the medical institution can directly check whether the disease is present, but it is quite cumbersome to collect urine at the hospital every time. In addition, in the case of cystitis and bladder stones, which have a high recurrence rate, it is necessary to check urine pH, etc. as a preventive measure even after surgery, and it is also very cumbersome to visit the hospital every time.

In the case of humans, urine can be collected and urged for examination, but pets have different characteristics than humans. Urine is relatively easy to collect in humans, but not so in pets.

In the case of domestic pets, the place of defecation is designated as a specific place in the house, and the dog is trained to have a regular bowel movement in the place by using a floor, a newspaper, and an absorbent sheet, commonly called a dog pad. This is usually done by collecting urine from the bottom.

And, if you want to measure the presence of disease by the urine collection of pets by natural urination, urine received at room temperature should be examined within 2 hours or within 12 hours under refrigerated storage. If urine is contaminated by contaminated floors, it may occur within 4 hours of refrigeration at room temperature for 30 minutes.

In addition, when urine is not collected and tested in a natural urine pet, urinary catheterization or bladder puncture is used in the hospital, all of which are required to be examined at each hospital visit. It is a cumbersome and inconvenient way.

Representative urinary stones include struvite stones and calcium oxalate stones. In the case of pet struvite stones, the urine of the pet is alkaline, and in the case of pet mallets with calcium oxalate stones, the urine of the pet is acidic. Therefore, monitoring the pH of urine is a very important factor in the early detection and management of bladder disease in pets.

In addition, these urinary stones are fairly high, with surgical recurrence rates of about 35%. Therefore, proper management is necessary even after surgery, and the most recommended method of management is to maintain proper acidity of urine in the pet by feeding the appropriate special feed. And this also requires monitoring the acidity of the urine of the pet. Therefore, there is a need for a method of easily monitoring at home the acidity of urine in a pet.

An object of the present invention can be printed on the surface of a variety of objects, and can react with the aqueous sample even after printing and drying, it is possible to measure the pH by changing the color of the print layer, less color bleeding, the change of the ink layer by the sample It is to provide an ink composition excellent in durability without discoloration or discoloration.

Another object of the present invention is to provide a method for producing the ink composition.

Another object of the present invention is to form a printing layer to measure the pH of the sample on the absorbent sheet, so that the color of the ink layer is small, so that the pH of the sample can be accurately identified, and the ink layer is excellent in printability and discoloration persistence after discoloration. Even after the time has cured, the result of measuring the pH of the sample can be checked, and when urine is used as a sample, it is to provide an absorbent sheet that can monitor the pH of urine without waiting for a bowel movement time or frequent hospital visits.

In order to achieve the above object, the ink composition according to an embodiment of the present invention is a pH indicator 0.001 to 10% by weight, adsorbent 5 to 35% by weight, water-soluble resin 10 to 30% by weight, solvent 35 to dissolve the water-soluble resin 80 weight percent, and 0-15 weight percent of other additives.

The pH indicator may be adsorbed on the adsorbent.

The pH indicator is thymol blue, tropaeolin 0, phenol red, phenol red, phenolphthalein, neutral red, methyl yellow, methyl orange orange, methyl red, methyl violet, congo red, alizarine red S, alizarine yellow R, bromocresol green, Bromocresol blue, bromocresol purple, bromophenol bleu, chlorophenol red, bromothymol blue, 2,5-dinitro Phenol (2,5-dinitrophenol), 2,6-dinitrophenol, p-nitrophenol, o-nitrophenol, lacmoid , Rosolic acid, cresol red, cresol purple, curcumin, o-cresolphthalein hthalein, thymolphthalein, nitramine, poirrier blue 4B, xylene cyanocle, indigo carmine, indigo carmine, thymolphthalene, 1,3,5-trinitrobenzene, ethyl orange, litmus, α-naphtholphthanlein and any combination thereof It may be one.

The pH indicator may include 5 to 30% by weight of methyl red, 45 to 80% by weight of bromothymol blue and 5 to 15% by weight of phenolphthalein with respect to the entire pH indicator.

The adsorbent may be any one selected from the group consisting of silicon dioxide, titanium dioxide, zinc oxide, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium carbonate and combinations thereof.

The water-soluble resin is a methylolated urea resin, methylolated melanin resin, polyvinyl alcohol, polyacrylamide, carboxymethylcellulose resin, acrylic ester resin, acrylic urethane resin, polyacrylic acid resin, maleic anhydride resin, gelatin resin, polyethylene glycol resin And combinations thereof may be any one selected from the group consisting of.

The solvent for dissolving the water-soluble resin is water, methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol , Hexylene glycol, thiodiglycol, hexane-1,2,6-triol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol mono It may be any one selected from the group consisting of methyl ether, triethanolamine, diethanolamine, monoethanolamine, glycerin, sorbitol and combinations thereof.

Method for preparing an ink composition according to another embodiment of the present invention is a water-soluble resin solution manufacturing step of mixing 35 to 80 parts by weight of solvent and 10 to 30 parts by weight of water-soluble resin and stirred at 50 to 100 ℃ for 8 to 16 hours, adsorbent 5 to 35 parts by weight and 5 to 35 parts by weight of the pH indicator solution to prepare a pH measuring adsorbent for drying for 8 to 16 hours at 60 to 100 ℃, and mixing and stirring the aqueous resin solution and the pH measuring adsorbent It includes an ink composition manufacturing step.

The solvent is water, methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, hexylene glycol, Thiodiglycol, hexane-1,2,6-triol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethanolamine , Diethanolamine, monoethanolamine, glycerin, sorbitol, and combinations thereof.

The adsorbent may be any one selected from the group consisting of silicon dioxide, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium carbonate and combinations thereof.

The pH indicator solution may include 0.001 to 10 parts by weight of pH indicator and 4.999 to 25 parts by weight of solvent based on 5 to 30 parts by weight of the pH indicator solution.

The method of preparing the ink composition may further include a stabilizing step of stabilizing at 0 to 40 ° C. for 20 to 28 hours after mixing and stirring the aqueous resin solution and the adsorbent for pH measurement in the ink composition manufacturing step. .

An absorbent sheet according to another embodiment of the present invention includes an absorbent layer and an ink composition including a pH indicator, an adsorbent, and a water-soluble resin.

The pH indicator may be adsorbed on the adsorbent.

The print layer may be printed with a thickness of 10 to 500um.

The ink composition includes 0.001 to 10% by weight of pH indicator, 5 to 35% by weight of adsorbent, 10 to 30% by weight of water-soluble resin, 35 to 80% by weight of solvent for dissolving the water-soluble resin, and 0 to 15% by weight of other additives. It may be.

The pH indicator is thymol blue, tropaeolin 0, phenol red, phenol red, phenolphthalein, neutral red, methyl yellow, methyl orange orange, methyl red, methyl violet, congo red, alizarine red S, alizarine yellow R, bromocresol green, Bromocresol blue, bromocresol purple, bromophenol bleu, chlorophenol red, bromothymol blue, 2,5-dinitro Phenol (2,5-dinitrophenol), 2,6-dinitrophenol, p-nitrophenol, o-nitrophenol, lacmoid , Rosolic acid, cresol red, cresol purple, curcumin, o-cresolphthalein phthalein, thymolphthalein, nitramine, poirrier blue 4B, xylene cyanocle, indigo carmine, thymolphthalene, 1,3,5-trinitrobenzene, ethyl orange, litmus, α-naphtholphthanlein and any combination thereof It may be one.

The adsorbent may be any one selected from the group consisting of calcium sulfate, titanium oxide, zinc oxide, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium carbonate and combinations thereof.

The absorbent sheet may further include a topsheet that is liquid permeable and located on one surface of the absorbent layer, and a bottomsheet that is liquid impermeable and located on the other surface of the absorbent layer, wherein the printed layer may be positioned on the topsheet.

The top sheet is any one selected from fibers composed of cotton fibers, wool fibers, hemp fibers, nylon fibers, PET fibers, acrylic fibers, PE fibers, PP fibers, viscose fibers, acetate fibers, glass fibers, carbon fibers, kevlar fibers and combinations thereof. It may be one.

The bottom sheet may be any one selected from the group consisting of polyethylene film, polypropylene film, polyethylene terephthalate film, and combinations thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Like parts are designated by like reference numerals throughout the specification.

<잉크조성물>Ink Composition

The ink composition according to an embodiment of the present invention includes a pH indicator, an adsorbent, a water-soluble resin, a solvent, and other additives.

The pH indicator changes the color in a specific pH range according to the pH of the sample to be measured, so that the pH of the sample can be known by the changed color.

The pH indicator can be used as long as it is generally known as a pH indicator, specifically, thymol blue (thymol blue), tropeolin o (tropaeolin 0), phenol red (phenol red), phenolphthalein (phenolphthalein), neutral red ( neutral red, methyl yellow, methyl orange, methyl red, methyl violet, congo red, alizarin red S, alizarin yellow R (alizarine yellow R), bromocresol green, bromocresol blue, bromocresol purple, bromophenol bleu, chlorophenol red, Bromothymol blue, 2,5-dinitrophenol, 2,6-dinitrophenol, p-nitrophenol, o O-nitrophenol, lacmoid, rosolic acid, cresoled cresol red, cresol purple, curcumin, o-cresolphthalein, thymolphthalein, nitramine, poirrier blue 4B, Xylene cyanocle (FF), indigo carmine, thymolphthalene, 1,3,5-trinitrobenzene, ethyl orange, litmus (litmus), α-naphtholphthanlein and any combination thereof may be used.

The discoloration range of the pH indicator is known, it can be used alone or mixed as appropriate, it is possible to adjust the color discolored by the color when neutral and acid or basic samples.

The pH indicator may be preferably any one selected from the group consisting of methyl red, bromothymol blue, phenolphthalein, and combinations thereof. The methyl red has a discoloration range of pH 4.0 to 6.3 and is yellow when it is acidic, and yellow when it is basic, and the bromothymol blue has a discoloration range of pH 6.0 to 7.8, and when it is acidic, blue when it is basic. Indicates. In addition, the phenolphthalein has a discoloration range of pH 8.0 to 10.0 and is colorless in basic and neutral, but red in alkaline.

The pH indicator may include 5 to 30% by weight of methyl red, 45 to 80% by weight of bromothymol blue and 5 to 25% by weight of phenolphthalein with respect to the entire pH indicator, preferably the pH indicator is methyl red 19 To 30% by weight, bromothymol blue 48 to 78% by weight and phenolphthalein 10 to 22% by weight, more preferably the pH indicator is 24.5 to 28.7% by weight methyl red, 52.9 to 58.7% bromothymol blue It may be included by weight and 15.9 to 18.2% by weight phenolphthalein.

If the pH indicator comprises the methyl red, bromothymol blue and phenolphthalein in the content range, the maximum pH range of urine that may appear in vivo in a veterinary living animal (dog or cat, etc.), that is, pH 4.5 to By inducing printing colors other than the color indicating 8.5, the difference in color by the sample can be clear, thereby improving visibility and recognizing the presence or absence of urination by color conversion within the visible distance.

For example, when dog urine is sampled, the pH of normal dog urine ranges from 6 to 7.5. The pH indicator including 5 to 30% by weight of methyl red, 30 to 80% by weight of bromothymol blue and 5 to 25% by weight of phenolphthalein in the above range of the pH indicator is yellow and yellow green in the range of normal urine. In the case of basic, green and dark green, and in the case of acidic orange and red, it can be confirmed whether the abnormality of urine through the color change of the pH indicator.

The pH indicator may be adsorbed on the adsorbent.

The adsorbent adsorbs the pH indicator so that the pH indicator can be stably present in the ink composition, and the color of the ink composition for pH measurement by preventing color change or color blur after discoloration of the pH indicator. It can play a role in maintaining the discolored state. In addition, it reinforces the printability of the ink, and also serves to improve the coating film properties.

Porous fine powder may be used as the adsorbent, and specifically, any one selected from the group consisting of silicon dioxide, titanium dioxide, zinc oxide, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium carbonate, and combinations thereof Can be used. The adsorbent may be selected and used in consideration of the color and the concentration of the pH indicator, it is preferable to use a white or transparent in that it is easy to recognize the change in color generated by the reaction of the pH indicator and the sample.

The adsorbent may be preferably any one selected from the group consisting of calcium sulfate, titanium dioxide, and combinations thereof. When using any one selected from the group consisting of calcium sulfate, titanium dioxide, and combinations thereof, it compensates for the disadvantage that the printing layer is absorbed into the absorbent layer before drying when printing, and delays the time that the sample absorbed by the printed layer is absorbed into the absorbent layer. This can improve color bleeding and discoloration.

The water-soluble resin imparts the coating performance of the ink and at the same time gives the adhesiveness to the printing surface, and unlike the oil-based ink resin, the water-soluble resin reacts with the pH indicator in the sample so as to measure the pH of the sample.

The water-soluble resin can be used as long as it is a resin used in the water-soluble ink composition, it is preferable to use a transparent resin in that the change in the color of the pH indicator can be easily recognized.

The water-soluble resin is a methylolated urea resin, methylolated melanin resin, polyvinyl alcohol, polyacrylamide, carboxymethylcellulose resin, acrylic ester resin, acrylic urethane resin, polyacrylic acid resin, maleic anhydride resin, gelatin resin, polyethylene glycol resin And may be any one selected from the group consisting of a combination thereof, preferably any one selected from the group consisting of polyacrylic acid resin, maleic anhydride resin, polyvinyl alcohol, gelatin resin, polyethylene glycol resin and combinations thereof have.

It is more preferable to use polyvinyl alcohol in that the water-soluble resin is not toxic, has excellent adhesive strength, and has excellent strength in forming a coating film, but the present invention is not limited thereto.

The polyvinyl alcohol may be used alone or mixed with a high molecular weight and a low molecular weight. The high molecular weight polyvinyl alcohol means that the weight average molecular weight is in the range of 50,000 to 186,000, and the low molecular weight polyvinyl alcohol means that the weight average molecular weight is in the range of 9,000 to 50,000. In the polyvinyl alcohol, using a high molecular weight polyvinyl alcohol and a low molecular weight polyvinyl alcohol in a weight ratio of 20 to 50:50 to 80 makes it easy to control the solubility of the water-soluble resin by the sample during viscosity adjustment or sample evaluation. Preferred at

As the solvent, any solvent can be used as long as it can dissolve the water-soluble resin, and is not particularly limited in the present invention.

Specifically, the solvent is water, methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, hex Silylene glycol, thiodiglycol, hexane-1,2,6-triol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol monomethyl ether , Triethanolamine, diethanolamine, monoethanolamine, glycerin, sorbitol, and any combination thereof may be used, and any one selected from water, ethanol, isopropyl alcohol, ethylene glycol, and combinations thereof You can use one. When using the solvent, it is possible to impart fluidity to the ink composition and to appropriately adjust the viscosity of the ink.

The ink composition may further include other additives such as a dispersant, an antifoaming agent, a light stabilizer, a viscosity modifier, a binder, a pH adjuster, and the like. The other additives serve to reinforce functions such as coating properties, dispersibility, and printability of the ink, and may or may not be used as necessary.

The dispersant facilitates dispersion of the ink composition and prevents reagglomeration to maintain a uniformly dispersed state. As the dispersant, a surfactant, a water-soluble resin, or the like may be used. Specifically, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a water-soluble acrylic resin, a cross-linked water-soluble acrylic resin, a water-soluble maleic acid resin , Any one selected from the group consisting of water-soluble styrene resins, water-soluble styrene acrylic resins, water-soluble styrene maleic acid resins, polyvinylpyrrolidone, and combinations thereof.

The antifoaming agent serves to remove bubbles in the manufacturing process and printing process of the ink composition. As the antifoaming agent, silicone-based, non-silicone-based, oil-based, or emulsion-based antifoams can be used alone or in combination.

The light stabilizer may be used a phenol-based or amine-based, the viscosity-modifying agent may be any one selected from the group consisting of silica-based viscosity regulators, cellulose-based viscosity regulators and combinations thereof, the cellulose-based viscosity regulators May be any one selected from the group consisting of ethyl hydroxyethyl cellulose, hydroxymethyl cellulose, carboxyl methyl cellulose, and a combination thereof.

The binder may be a synthetic resin emulsion, specifically, an acrylic synthetic resin emulsion, a styrene acrylic synthetic resin emulsion, a vinyl acetate synthetic resin emulsion, and the like. Preferably, any one selected from the group consisting of an acrylic ester copolymer synthetic resin emulsion, a styrene acrylic acid ester copolymer synthetic resin emulsion, a vinyl acetate synthetic resin emulsion, a vinyl acetate acrylic acid ester copolymer synthetic resin emulsion, and a combination thereof may be used.

The pH adjusting agent serves to adjust the pH of the ink composition itself to neutral. As said pH adjuster, organic basic compounds, such as inorganic salts, such as sodium carbonate, sodium phosphate, and sodium acetate, and a water-soluble amine compound, can be used.

Other rust inhibitors, preservatives, fungicides and the like can also be used as other additives.

The ink composition includes 0.001 to 10% by weight of pH indicator, 5 to 35% by weight of adsorbent, 10 to 30% by weight of water-soluble resin, 35 to 80% by weight of solvent for dissolving the water-soluble resin, and 0 to 15% by weight of other additives. Preferably, 0.001 to 10% by weight of pH indicator, 5 to 15% by weight of adsorbent, 10 to 20% by weight of water-soluble resin, 40 to 65% by weight of solvent for dissolving the water-soluble resin, and 0 to 15% by weight of other additives. It may include, more preferably 10% by weight of the pH indicator solution, 15% by weight of the adsorbent, 15% by weight of the water-soluble resin, 50% by weight of the solvent for dissolving the water-soluble resin, and 10% by weight of other additives.

The possibility that the effects expected in the ink composition of the respective components mentioned above may be lowered by interference between the components when the ink composition contains a pH indicator, an adsorbent, a water-soluble resin, a solvent and other additives in the content. Can be minimized, but can be stably printed and implemented.

Since the ink composition contains the water-soluble resin, in the case of general ink, the dried ink and the aqueous sample cannot react after printing and drying, and the ink composition reacts with the aqueous sample without color bleeding by the aqueous sample even after printing and drying. There are features that can be done. In addition, the ink composition may improve color bleeding (visibility) by adsorbing the pH indicator to the adsorbent, and after printing and drying the printed ink by color change while measuring the pH of the sample through discoloration of the printed and dried ink. It is also characterized by excellent color persistence without the phenomenon of color change. In particular, the persistence of the color is distinguished from the case of measuring the pH with only the pH indicator without using the ink composition.

In addition, the ink dried by printing including the ink composition may sufficiently induce discoloration of the pH indicator adsorbed on the adsorbent by appropriately delaying the absorption of the sample.

The ink composition may be applied by a conventional printing method, and may be printed using a screen printing method in that it can be easily applied to various materials. In addition, the ink composition may be used by printing any material as long as it can be applied to a conventional printing method. Specifically, it can be printed and used on any one selected from the group consisting of paper, nonwoven fabric, fiber, wood, synthetic resin, glass, metal and combinations thereof, and preferably used for pH measurement.

The ink composition may be applied to various samples for measuring pH, and may be preferably used for measuring pH of urine, but is not limited thereto.

<잉크 조성물의 제조방법><Method for Producing Ink Composition>

1 is a flow chart showing the manufacturing steps of the ink composition according to an embodiment of the present invention. Hereinafter, a manufacturing method of the ink composition will be described with reference to FIG. 1.

Referring to FIG. 1, the ink composition may be prepared through a water-soluble resin solution manufacturing step (S1), an pH measuring adsorbent manufacturing step (S2), and an ink composition manufacturing step (S3).

The water-soluble resin solution manufacturing step (S1) includes a process of mixing 35 to 80 parts by weight of the solvent and 10 to 30 parts by weight of the water-soluble resin and stirring for 8 to 16 hours at 50 to 100 ℃. The water-soluble resin solution manufacturing step (S1) may be preferably made for 10 to 14 hours at 60 to 80 ℃.

When the mixture of the solvent and the water-soluble resin is stirred at 50 to 100 ° C., the solid water-soluble resin can be completely liquefied and maintained at an appropriate viscosity within a short time, and the viscosity may increase when the temperature is lower than the stirring temperature and time range. If the stirring temperature and time range are exceeded, the solvent may be evaporated unless a special equipment such as a cooling condensor is used.

The content of the solvent and the water-soluble resin in the water-soluble resin solution manufacturing step (S1) may be 10 to 20 parts by weight of the water-soluble resin and 40 to 65 parts by weight of the solvent, preferably 15 parts by weight of the water-soluble resin and 50 parts by weight of the solvent. When the solvent and the water-soluble resin are mixed within the above range, the water-soluble resin liquid may be prepared at an appropriate viscosity, and then, in consideration of the increase in viscosity when the adsorbent is added, it is possible to maintain an appropriate viscosity.

The details regarding the solvent and the water-soluble resin are as mentioned in the ink composition.

The preparation of the adsorbent for pH measurement (S2) includes a process of mixing 5 to 35 parts by weight of the adsorbent and 5 to 35 parts by weight of the pH indicator solution and drying at 60 to 100 ° C. for 8 to 16 hours. The drying may be preferably carried out at 70 to 90 ℃ for 11 to 13 hours. When drying at the above temperature and time range, the pH indicator is adsorbed to the porous powder adsorbent by evaporating the dissolved solvent, the pH indicator is mixed with the water-soluble resin, so that the mixture of the pH indicator and the water-soluble resin that is not water-soluble is dissolved in the aqueous sample. It is not absorbed rapidly by the absorber layer.

The adsorbent and the pH indicator solution may be preferably mixed with 5 to 15 parts by weight of the adsorbent and 5 to 15 parts by weight of the pH indicator solution, and more preferably 10 parts by weight of the pH indicator solution and 15 parts by weight of the adsorbent.

When the content of the adsorbent and the pH indicator solution is within the above range, there is an advantageous effect in that the visibility of color change according to the pH value can be maximized. That is, when the pH indicator solution exceeds the content range compared to the adsorbent, the color appears darker, but when two or more pH indicator solutions are mixed, the color becomes darker and the visibility of the color change according to the pH value may be lowered.

The pH indicator solution may include 0.001 to 10 parts by weight of pH indicator and 4.999 to 25 parts by weight of solvent based on 5 to 30 parts by weight of the pH indicator solution. When the content of the pH indicator is within the range can be adjusted so that the content of the pH indicator to 0.001 to 10% by weight based on the entirety of the prepared ink composition.

The solvent included in the pH indicator solution may be used as long as it can dissolve the pH indicator, alcohols may be preferably used, but the present invention is not limited thereto.

Details of the adsorbent and the pH indicator are the same as mentioned in the ink composition.

The ink composition manufacturing step (S3) includes a process of mixing and stirring the prepared water-soluble resin solution and the adsorbent for pH measurement. The mixing and stirring may use a known means used for mixing and stirring to sufficiently mix the water-soluble resin liquid and the adsorbent for pH measurement. Specifically, one or more stirrers selected from a screw stirrer, a homogenizer stirrer, and an ultrasonic stirrer may be used. Preferably, a screw stirrer, a homogenizer stirrer, or an ultrasonic stirrer may be used sequentially.

The process of mixing and stirring in the ink composition manufacturing step (S3) may be performed for 2 to 5 hours, preferably 3 to 4 hours to achieve sufficient dispersion. The ink composition manufacturing step (S3) may be made in a temperature range of 20 to 30 ℃.

The ink composition may further include the other additives. The other additives may be added in the water-soluble resin liquid manufacturing step (S1), or may be added in the ink composition manufacturing step (S3). The other additives may be any one selected from the group consisting of dispersants, antifoaming agents, light stabilizers, viscosity regulators, binders, pH regulators, rust inhibitors, preservatives, antibacterial agents and combinations thereof.

After the mixing and stirring the water-soluble resin solution and the pH measuring adsorbent in the ink composition manufacturing step (S3) may further comprise a stabilization step (S4) for stabilizing at 0 to 40 ℃ for 20 to 28 hours. The stabilization step (S4) may be preferably stabilized at 15 to 30 ℃ for 22 to 26 hours. In the case of stabilization within the time and temperature range, bubbles generated during agitation are reduced, and the solvent dissolving the water-soluble resin is moved to the combination of the pH indicator and the adsorbent during the agitation, and the viscosity is changed. Due to the movement of moisture into the adsorbent, the amount of moisture absorbed by the absorbent layer during printing may be minimized.

<흡수시트><Absorption sheet>

2 is a plan view of an absorbent sheet according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view of the absorbent sheet of FIG. Figure 4 shows a cross-sectional view of the absorbent sheet according to another embodiment of the present invention. Hereinafter, the absorbent sheet will be described with reference to FIGS. 2 to 4.

2 to 4, the absorbent sheet 100 includes an absorbent layer 110 and a printed layer 120.

The absorber layer 110 may use a material capable of absorbing a large amount of liquid, and is not particularly limited in the present invention. Specifically, the absorbent layer 110 may include any one selected from the group consisting of pulp, superabsorbent resin, and combinations thereof. The super absorbent polymer refers to a super absorbent polymer (SAP), and the SAP refers to a polymer resin having a property of being instantaneously absorbed and swollen when contacted with a liquid.

As the super absorbent polymer included in the absorbent layer 110, specifically, carboxymethyl cellulose, alkali metal salt of polyacrylic acid, polyacrylamide, polyvinyl alcohol, ethylene maleic anhydride copolymer, polyvinyl ether, hydroxypropyl cellulose, poly Any one selected from the group consisting of vinyl morpholinone, polymers and copolymers of vinylsulfonic acid, polyacrylates, polyacrylamides, polyvinylpyridine and combinations thereof may be used, and natural materials such as pectin and guar gum may be used. It may also include. As the absorbent layer 110, any one can be used as long as it is used in a general absorbent article, and is not limited to the substrate.

The absorber layer 110 may be formed as a single layer, but may be formed in a multi-layered structure in which a superabsorbent resin layer is formed and the tissue layer 150 is formed above, below, or above and below. The absorbent layer 110 having the structure of the multilayered layer may have the same absorbent capacity even though the absorbent layer 110 is thinner than the single layer, and the superabsorbent polymer absorbing the liquid is gelled and the liquid absorbed into the tissue layer 150. It also has the effect of preventing backflow. In addition, the tissue layer 150 may prevent the flow of the absorbent included in the absorbent layer.

The print layer 120 may include an ink composition including a pH indicator, an adsorbent, and a water-soluble resin, and the ink composition is as described above.

The print layer 120 may be printed with a thickness of 10 to 500um. When the printed layer 120 is formed to a thickness of less than 10 μm, problems such as non-uniformity in printing, an increase in absorption rate of the absorbent paper into the absorbent layer during printing, and a decrease in the absorbed amount of the sample due to a decrease in the volume of the printed layer 120 may occur. When the printed layer 120 is formed to exceed 500 μm, printing irregularities, cracks in the printed layer during drying, and partial peeling of the printed layer 120 may occur when the sample is absorbed.

The print layer 120 may be formed by a conventional printing method, and preferably may be formed by screen printing, but the present invention is not limited thereto. The screen printing is most preferable for obtaining the expected printed image even when the surface of the printed object is not smooth. Specifically, the printing layer 120 may be formed by printing the ink composition on the absorbent article by a screen printing method and drying for 30 to 300 seconds with an infrared hot air dryer at a temperature of 50 to 90 ℃.

The absorbent sheet 100 may further include a top sheet 130 that is liquid permeable and positioned on one surface of the absorbent layer 110, and a bottom sheet 140 that is liquid impermeable and positioned on the other surface of the absorbent layer 110. Can be.

The top sheet 130 is liquid permeable, cotton fiber, wool fiber, hemp fiber, nylon fiber, PET (polyethylene terphethalate) fiber, acrylic fiber, PE (polyester) fiber, PP (polypropylene) fiber, viscose fiber, acetate fiber, glass It may be made of fibers consisting of fibers, carbon fibers, Kevlar fibers and combinations thereof, and may be a liquid permeable nonwoven fabric, which is preferably a PP fiber.

The lower sheet 140 is liquid impermeable and may be any one selected from the group consisting of a polyethylene film, a polypropylene film, a polyethylene terephthalate film, and a combination thereof, and may be used as the upper sheet 130. It is also possible to use laminates of impermeable films, preferably polyethylene films. The lower sheet 140 prevents the absorbent sheet 100 from being absorbed by the absorbent layer 110 even when the liquid is excessive, and removes the absorbent sheet 100 easily and hygienically after use.

The printed layer 120 may be located above the absorber layer 110, and preferably may be positioned on the top sheet 130. This is because when the print layer 120 is positioned below the absorber layer 110, the sample may be absorbed and gelated by the absorber layer 110, and thus it may be difficult to react with the pH indicator included in the print layer 120. . In addition, when the printing layer 120 is positioned above the top sheet 130, absorption of a part of the sample is delayed by the surface of the printing layer 120, so that the pH indicator and the feed contained in the printing layer 120 react. It may be easy to.

The absorbent sheet 100 may further include a deodorant, an antimicrobial agent, or an antibacterial agent in any one layer selected from the group consisting of the absorbent layer 110, the tissue layer 150, and the top sheet 130.

The absorbent sheet 100 is useful as a sample for measuring pH, and particularly useful when urine is used as a sample, but is not limited thereto. In addition, the absorbent sheet 100 is useful for pets, particularly useful for dogs, but may be applied without being limited to dogs, if the absorbent sheet 100 can be used for the purpose of measuring the pH of the sample.

The absorbent sheet 100 is provided with a pH index indicating a pH corresponding to a color of the printed layer 120 of the absorbent sheet 100 or a part of the absorbent sheet 100 or separately from the absorbent sheet 100. can do.

The ink composition of the present invention can be printed on the surface of various objects. In addition, the print layer formed through the printing of the ink composition can react with the aqueous sample even after printing and drying, so that the pH can be measured by the change of the color of the print layer, the color bleeding is small, and the discoloration of the ink layer changed by the sample No discoloration

Absorption sheet of the present invention forms a printed layer on the absorbent sheet to measure the pH of the sample, so that there is little color bleeding of the ink layer, so that the pH of the sample can be accurately identified, and the ink layer has excellent printability and discoloration persistence, and thus time after discoloration. Even after this hardening, the measurement result of the pH of a sample can be confirmed. In addition, when urine is used as a sample, the pH of urine can be monitored without the hassle of waiting for a bowel movement or the frequent visit to a hospital.

1 is a flow chart showing a method of manufacturing an ink composition according to an embodiment of the present invention.

Figure 2 is a plan view of an absorbent sheet according to an embodiment of the present invention.

3 is a cross-sectional view of the absorbent sheet of FIG.

Figure 4 is a cross-sectional view of the absorbent sheet according to another embodiment of the present invention.

Figure 5 is a photograph showing the color bleeding of the Example, Comparative Example 1 and Comparative Example 2.

The following presents specific embodiments of the present invention. However, the embodiments described below are merely for illustrating or explaining the present invention in detail, and the present invention is not limited thereto. In addition, the contents not described herein are omitted, since those skilled in the art can be sufficiently technically induced.

(제조예-잉크 조성물의 제조)Preparation Example-Preparation of Ink Composition

(Example)

The solvent 500g which mixed distilled water, ethyl alcohol, isopropyl alcohol, and ethylene glycol was mixed with the stirrer. At this time, the temperature of the stirrer was maintained at a temperature of 60 to 80 ℃, 150g of polyvinyl alcohol resin was added while stirring the solvent and stirred for 12 hours to prepare a water-soluble resin A.

100 g of a mixed pH indicator was added dropwise to 150 g of an adsorbent mixed with calcium sulfate and titanium dioxide. The mixed pH indicator was prepared by mixing 13 g of methyl red, 75.5 g of bromothymol blue, and 11.5 g of phenolphthalein. The mixture of the adsorbent and the mixed pH indicator was hot-air dried at 80 ° C. for 12 hours. Adsorbent B was prepared by grinding the adsorbent to which the dried pH indicator was adsorbed.

650 g of the water-soluble resin A and 250 g of the adsorbent B were mixed in the reactor, followed by stirring in the order of a screw stirrer, a homogenizer stirrer, and an ultrasonic stirrer. The ink was prepared by stabilizing the ink composition, which was a mixture of water-soluble resin A and adsorbent B completely dispersed by stirring for 3 hours, in a manner of naturally cooling at 25 ° C. for 24 hours.

(Comparative Example 1)

An ink was prepared in the same manner as in Example 1, except that 100 g of the mixed pH indicator was mixed with the water-soluble resin A to prepare an ink without using an adsorbent mixed with calcium sulfate and titanium dioxide.

(Comparative Example 2)

100 g of the mixed pH indicator prepared in Example 1 was used as an ink.

(실시예- 흡수시트의 제조)Example-Preparation of Absorption Sheet

(Example)

The ink composition prepared according to the embodiment relating to the preparation of the ink composition was screen printed on the upper sheet of the absorbent sheet. The absorbent sheet was used for general purpose doctor pad manufactured by CarePost, Inc. (420x490mm, SAP content 10%, manufactured by Carepost, Inc.), and the material of the upper sheet is a nonwoven fabric.

After printing the ink composition prepared according to the embodiment of the ink composition on the absorbent sheet and dried for 30 seconds in an infrared hot air dryer at 70 ℃ non-woven fabric containing a ink composition containing a pH indicator and an adsorbent An absorbent sheet formed on top was prepared.

(Comparative Example 1)

The ink prepared according to Comparative Example 1 relating to the preparation of the ink composition was screen printed on the upper sheet of the absorbent sheet. Except for the used ink, the absorbent sheet of Comparative Example 1 was prepared by the same method as the preparation example of the absorbent sheet.

(Comparative Example 2)

The ink prepared according to Comparative Example 2 relating to the preparation of the ink composition was screen printed onto the top sheet of the absorbent sheet. Except for the used ink, the absorbent sheet of Comparative Example 1 was prepared by the same method as the preparation example of the absorbent sheet.

(실험예- 흡수시트를 이용한 pH측정)(Experimental example-pH measurement using absorption sheet)

Whether the absorbent pad having the printed layer prepared in the embodiment relating to the manufacture of the absorbent sheet and the absorbent pad prepared in the comparative example relating to the manufacture of the absorbent sheet were discolored using a sample having a pH as shown in Table 1 below. And discoloration persistence. The measured results are shown in Table 2.

Table 1

	Sample 1	Sample 2	Sample 3	Sample 4	Sample 5
pH	5	6	7	8	9

The sample was tested at 38 ° C., similar to the body temperature of the dog, and the amount of sample applied was 3 to 5 ml per time.

Table 2 below shows the presence or absence of color bleeding (visibility) after printing and drying the ink of the absorbent sheets of Examples and Comparative Examples. The color bleeding (visibility) was evaluated by a number of 0 to 2, with 0 indicating 'no color bleeding', 1 indicating 'a little color bleeding', and 2 indicating 'the degree of color bleeding'.

TABLE 2

	Example-Sample 1	Example-Sample 2	Example- Sample 3	Example- Sample 4	Example-Sample 5
Color bleeding degree	0	0	0	0	0
	Comparative Example 1 Sample 1	Comparative Example 1-Sample 2	Comparative Example 1 Sample 3	Comparative Example 1 Sample 4	Comparative Example 1-Sample 5
Color bleeding degree	One	One	2	2	One
	Comparative Example 2- Sample 1	Comparative Example 2- Sample 2	Comparative Example 2- Sample 3	Comparative Example 2-Sample 4	Comparative Example 2- Sample 5
Color bleeding degree	2	2	2	2	2

5 shows photographs of Examples, Comparative Example 1, and Comparative Example 2 related to color bleed digitized in Table 2 above. In the photo of FIG. 5, the upper part shows a picture taken with a general camera, the middle part shows a picture taken by expanding 30 times, and the lower part shows a picture taken by expanding 150 times.

Referring to the photo of Figure 5, it can be confirmed that the embodiment was excellently printed on the surface of the nonwoven fabric by tightly blocking the gap between the non-woven fabric containing the dye.

On the other hand, Comparative Example 1 using the ink that is not treated with the adsorbent has no color bleeding, but the ink escapes between the gaps of the nonwoven fabric and is absorbed by the absorbent layer.

In addition, in the case of Comparative Example 2 using only the indicator as the ink, a large portion of the bleed after printing or most of the ink escapes between the gaps of the nonwoven fabric is absorbed by the absorber layer is faintly printed on the surface of the nonwoven fabric, it can be confirmed that the degree of color bleeding is severe. there was.

Table 3 below shows the color of the printed ink before reacting with the sample and the color of the ink after reacting with the sample.

TABLE 3

division	Ink color printed before reaction with sample	Ink color printed after reaction with sample
Example-Sample 1	Orange	Dark orange
Example-Sample 2	Orange	Orange
Example-Sample 3	Orange	yellow
Example-Sample 4	Orange	green
Example-Sample 5	Orange	Turquoise
Comparative Example 1-Sample 1	Orange	Dark orange
Comparative Example 1-Sample 2	Orange	Orange
Comparative Example 1-Sample 3	Orange	yellow
Comparative Example 1-Sample 4	Orange	green
Comparative Example 1-Sample 5	Orange	Turquoise
Comparative Example 2-Sample 1	Orange	Dark orange
Comparative Example 2-Sample 2	Orange	Orange
Comparative Example 2-Sample 3	Orange	yellow
Comparative Example 2-Sample 4	Orange	green
Comparative Example 2-Sample 5	Orange	Turquoise

Table 4 below shows whether color fading phenomenon occurs as the time elapsed after reacting the ink printed and dried on the absorbent sheets of Examples and Comparative Examples with a sample (persistence).

In Table 4, the color is blurred or changed (persistence, color fading) is represented by a number of 0 to 2, 0 is 'no color fading', 1 is 'a little color fading', and 2 Indicates that the degree of color fading is severe.

Table 4

Elapsed time	10 minutes	30 minutes	1 hours	2 hours	6 hours	12 hours	24 hours	48 hours
Example-Sample 1	0	0	0	0	0	One	One	2
Example-Sample 2	0	0	0	0	0	0	One	One
Example-Sample 3	0	0	0	0	0	0	0	0
Example-Sample 4	0	0	0	0	0	0	0	0
Example-Sample 5	0	0	0	0	0	0	0	0
Comparative Example 1-Sample 1	One	One	2	2	2	2	2	2
Comparative Example 1-Sample 2	2	2	2	2	2	2	2	2
Comparative Example 1-Sample 3	2	2	2	2	2	2	2	2
Comparative Example 1-Sample 4	2	2	2	2	2	2	2	2
Comparative Example 1-Sample 5	One	One	One	2	2	2	2	2
Comparative Example 2-Sample 1	2	2	2	2	2	2	2	2
Comparative Example 2-Sample 2	2	2	2	2	2	2	2	2
Comparative Example 2-Sample 3	2	2	2	2	2	2	2	2
Comparative Example 2-Sample 4	2	2	2	2	2	2	2	2
Comparative Example 2-Sample 5	2	2	2	2	2	2	2	2

Referring to Tables 3 and 4, the examples reacted with the samples having respective pHs shown in Table 1 exhibited a sharp color change, and the changed color of the examples continued vividly even after elapsed time. Could confirm.

However, in the case of Comparative Example 1, there was a color loss immediately after the color change, but the color was distinguished, but the color loss phenomenon was severe as time passed, and after 2 hours, the degree of color loss became worse in all of Samples 1 to 5 It became difficult to see the color of the printed ink.

In Comparative Example 2, the degree of color loss was most severe, and the changed color was also faint, making it difficult to identify the changed color.

The results of the experiment showed that the absorbent sheet including the print layer of the present invention reacts with the sample without color bleeding and exhibits the characteristic of clearly changing the color of the ink according to the pH of the sample. It was found that it shows excellent characteristics as the absorbent sheet for measuring pH.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

pH indicator 0.001 to 10% by weight,

5 to 35% by weight of adsorbent,

10 to 30% by weight of the water-soluble resin,

35 to 80% by weight of a solvent for dissolving the water-soluble resin, and

0 to 15 wt% of other additives

Ink composition comprising a.
The method of claim 1,

The pH indicator is an ink composition adsorbed on the adsorbent.
The method of claim 1,

The pH indicator is thymol blue, tropaeolin 0, phenol red, phenol red, phenolphthalein, neutral red, methyl yellow, methyl orange orange, methyl red, methyl violet, congo red, alizarine red S, alizarine yellow R, bromocresol green, Bromocresol blue, bromocresol purple, bromophenol bleu, chlorophenol red, bromothymol blue, 2,5-dinitro Phenol (2,5-dinitrophenol), 2,6-dinitrophenol, p-nitrophenol, o-nitrophenol, lacmoid , Rosolic acid, cresol red, cresol purple, curcumin, o-cresolphthalein hthalein, thymolphthalein, nitramine, poirrier blue 4B, xylene cyanocle, indigo carmine, indigo carmine, thymolphthalene, 1,3,5-trinitrobenzene, ethyl orange, litmus, α-naphtholphthanlein and any combination thereof One ink composition.
The method of claim 1,

Wherein the pH indicator comprises 5 to 30% by weight of methyl red, 45 to 80% by weight of bromothymol blue and 5 to 25% by weight of phenolphthalein, based on the entire pH indicator.
The method of claim 1,

The adsorbent is any one selected from the group consisting of silicon dioxide, titanium dioxide, zinc oxide, aluminum oxide, barium sulfate, calcium carbonate, calcium sulfate, magnesium carbonate and combinations thereof.
The method of claim 1,

The water-soluble resin is a methylolated urea resin, methylolated melanin resin, polyvinyl alcohol, polyacrylamide, carboxymethylcellulose resin, acrylic ester resin, acrylic urethane resin, polyacrylic acid resin, maleic anhydride resin, gelatin resin, polyethylene glycol resin And any one selected from the group consisting of a combination of the ink composition.
The method of claim 1,

The solvent for dissolving the water-soluble resin is water, methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol , Hexylene glycol, thiodiglycol, hexane-1,2,6-triol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, triethylene glycol mono Ink composition of any one selected from the group consisting of methyl ether, triethanolamine, diethanolamine, monoethanolamine, glycerin, sorbitol and combinations thereof.
A water-soluble resin liquid production step of mixing for 35 to 80 parts by weight of solvent and 10 to 30 parts by weight of water-soluble resin and stirred at 50 to 100 ℃ for 8 to 16 hours,

5 to 35 parts by weight of the adsorbent and 5 to 35 parts by weight of the pH indicator solution to prepare an adsorbent for pH measurement to dry at 60 to 100 ℃ for 8 to 16 hours, and

Ink composition manufacturing step of mixing and stirring the water-soluble resin solution and the adsorbent for pH measurement

Method of producing an ink composition comprising a.
The method of claim 8,

Wherein the pH indicator solution comprises 0.001 to 10 parts by weight of pH indicator and 4.999 to 25 parts by weight of solvent based on 5 to 30 parts by weight of the pH indicator solution.
The method of claim 8,

Method for producing an ink composition further comprises a stabilizing step of stabilizing at 0 to 40 ℃ for 20 to 28 hours after mixing and stirring the water-soluble resin solution and the pH measuring adsorbent in the ink composition manufacturing step.
An absorbent layer, and

Printed layer comprising ink composition comprising pH indicator, adsorbent and water soluble resin

Absorption sheet comprising a.
The method of claim 11,

The pH indicator is absorbent sheet is adsorbed on the adsorbent.
The method of claim 11,

The printing layer is an absorption sheet is printed in a thickness of 10 to 500um.
The method of claim 11,

The ink composition is

pH indicator 0.001 to 10% by weight,

5 to 35% by weight of adsorbent,

10 to 30% by weight of the water-soluble resin,

35 to 80% by weight of a solvent for dissolving the water-soluble resin, and

0 to 15 wt% of other additives

Absorbing sheet comprising a.
The method of claim 11,

The absorbent sheet is

A top sheet positioned on one surface of the absorbent layer and permeable to liquid; and

Further comprising a lower surface sheet which is located on the other side of the absorbent layer and is liquid impermeable,

The printing layer is the absorbent sheet is located on the top sheet.