CN114656839A - Humidity-sensitive ink for humidity detection card, preparation method of humidity-sensitive ink and humidity detection card - Google Patents
Humidity-sensitive ink for humidity detection card, preparation method of humidity-sensitive ink and humidity detection card Download PDFInfo
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- CN114656839A CN114656839A CN202210458074.4A CN202210458074A CN114656839A CN 114656839 A CN114656839 A CN 114656839A CN 202210458074 A CN202210458074 A CN 202210458074A CN 114656839 A CN114656839 A CN 114656839A
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- 150000003077 polyols Chemical class 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229940001941 soy protein Drugs 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010981 turquoise Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/50—Sympathetic, colour changing or similar inks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/81—Indicating humidity
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Abstract
The invention provides humidity sensitive ink for a humidity detection card, which comprises a PH dye indicator, a PH value regulator, water sensitive salt, a binder, a high-boiling-point moisture absorbent, a rheological agent, a defoaming agent and an organic solvent. The invention also provides a preparation method of the humidity sensitive ink for the humidity detection card. The invention also provides a humidity detection card. The invention has the beneficial effects that: the humidity detection card has the advantages of humidity detection function, small size, low cost, reusability, convenience in storage and carrying, simplicity and flexibility in operation, visual measurement standard, environmental friendliness and capability of being used in daily life.
Description
Technical Field
The invention relates to a humidity detection card, in particular to humidity sensitive ink for the humidity detection card, a preparation method of the humidity sensitive ink and the humidity detection card.
Background
The main role of humidity detection is to detect the relative humidity in the environment. Foreign research on humidity detection technology begins in the 70 th century, and China begins in the 80 th century. The research on environmental humidity control starts from the need of industrial development, and the temperature and humidity control is performed on specific occasions, such as: warehouses, food processing factories, archive data storage libraries, electric power systems, agricultural cultivation bases, operating rooms and the like. Humidity has a great impact on these particular applications, for example: due to improper humidity, various moulds grow in the food, so that the food is deteriorated; too high or too low humidity can cause failure in cultivation of the agricultural greenhouse; the humidity is too low, which easily causes air drying to cause static electricity, thereby burning out the power supply equipment and lines. Therefore, earlier researches mainly aim at a temperature and humidity detection system which can meet the requirements of industrial production to the maximum extent.
With the continuous development of science and technology, humidity monitoring is increasingly applied to daily life environment places of people, especially in dry seasons or places, such as dry autumn and winter, air-conditioned rooms and the like. Through the detection to humidity in the air to artificial indoor relative humidity adjusts, reaches the most comfortable humidity environment of human body, keeps the comfortable comfort of body and mind. At present, products available in the market for specific application in daily life of people or laboratory humidity detection mainly comprise: class of instrumentation, for example: digital temperature and humidity meter, data recorder, humiture detecting system. And secondly, humidity cards are mainly classified into cobalt humidity cards and cobalt-free humidity cards. Compared with instruments and equipment, the humidity card is mainly applied to temporary inspection and does not have a humidity data recording function, and the standard of the humidity card mainly depends on a standard range set when the humidity card is prepared or a certain fixed humidity value. But the characteristics of convenience and low cost and the upgrading of the production process level lead the application fields of the method to be wider and wider (indoor humidity detection, packaged product humidity detection and the like). According to incomplete statistics, the daily yield of a professional production company can reach about 60000-100000, and the economic development prospect is very considerable.
The cobalt-containing humidity card is less in use due to the fact that the cobalt-free environment-friendly humidity card does not meet the environment-friendly requirement, the cobalt-free environment-friendly humidity card is mainly used for humidity detection through liquid medicine on a carrier, a large number of whole boxes are required to be stored in a sealed mode, drying agents need to be added into a storage iron tank, the drying agents need to be replaced timely along with the packaging opening times, and the cobalt-containing humidity card is only used for one time.
Therefore, how to provide a humidity detection card with humidity detection function, small volume, low cost, reusability, convenient storage and carrying, simple and flexible operation, and visual measurement standard is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides humidity sensitive ink for a humidity detection card, a preparation method of the humidity sensitive ink and the humidity detection card.
The invention provides humidity sensitive ink for a humidity detection card, which comprises a PH dye indicator, a PH value regulator, water sensitive salt, a binder, a high-boiling-point moisture absorbent, a rheological agent, a defoaming agent and an organic solvent.
As a further improvement of the invention, the humidity sensitive ink comprises 0.1-9% of a PH dye indicator, 1-13% of a PH value regulator, 3.5-26.5% of water sensitive salt, 9-27% of a binder, 4-27% of a high boiling point moisture absorbent, 4-18% of a rheological agent, 0.1-4.5% of an antifoaming agent and 27-62.5% of an organic solvent in percentage by weight.
As a further improvement of the present invention, the PH dye indicator comprises any one or any combination of thymol blue, bromothymol blue, bromophenol blue, xylenol blue, cresol purple, bromocresol purple, m-cresol purple, methyl violet, gentian violet, cresol red, methyl red, neutral red, phenol red, methyl orange, methyl yellow, bromocresol green, malachite green, litmus, phenolphthalein, and blackcurrant red.
As a further improvement of the invention, the pH regulator comprises any one or any combination of sulfuric acid, nitric acid, citric acid, acetic acid, sodium hydroxide and potassium hydroxide.
As a further improvement of the invention, the water sensitive salt comprises any one or any combination of sodium carbonate, copper sulfate, ferrous sulfate, zinc sulfate, aluminum potassium sulfate, calcium sulfate, sodium thiosulfate, magnesium nitrate and potassium carbonate.
As a further improvement of the present invention, the binder includes any one or any combination of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, associative polyurethane thickeners, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soy protein gum, natural rubber, lanolin, agar, polyacrylamide, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbomer resin, polyacrylate copolymer emulsion, polyurethane, modified polyurea, and low molecular polyethylene wax.
As a further improvement of the present invention, the high boiling point moisture absorbent includes any one or any combination of magnesium sulfate, sodium sulfate, glycerol, ethylene glycol, glycerol, magnesium chloride and calcium chloride.
As a further improvement of the invention, the rheological agent comprises any one or any combination of modified acrylate cross-linked copolymer and nonionic polyether polyurethane.
As a further improvement of the invention, the defoaming agent comprises any one or any combination of modified silicone emulsion and mineral oil.
As a further improvement of the invention, the organic solvent comprises any one or any combination of ethanol, isopropanol and methanol, or deionized water.
The invention also provides a preparation method of the humidity sensitive ink for the humidity detection card, which comprises the following steps:
s1, dissolving the water sensitive salt in deionized water, and fully stirring to obtain a solution I;
s2, dissolving the PH dye indicator in an organic solvent, and fully stirring to obtain a solution II;
s3, mixing the solution I and the solution II, and fully stirring to obtain a solution III;
s4, adding a pH regulator into the solution III, and fully stirring to obtain a solution IV;
s5, adding a binder with neutral pH into the solution IV, and fully stirring to obtain a solution V;
s6, sequentially adding a rheological agent and a defoaming agent into the solution V, and fully stirring to obtain the humidity sensitive ink.
The invention also provides a humidity detection card, which comprises a substrate layer, an indication layer, a zeolite film and a surface layer, wherein,
the basal layer is a cut body of the humidity detection card;
the indicating layer is also called a printing layer, is arranged on the substrate layer and comprises a pattern layer, and the pattern layer is printed by using the humidity-sensitive ink as described in any one of the above;
the zeolite film is arranged on the indicating layer and is made of a resin composition containing a zeolite component;
the surface layer is arranged on the zeolite film and is a low-refractive-index coating.
As a further improvement of the invention, the ink layer thickness of the pattern layer is 0.3um to 100 um.
As a further improvement of the invention, the periphery of the pattern layer is filled with adhesive.
As a further improvement of the invention, the pattern layer is printed by an ink-jet printer.
As a further improvement of the invention, the coating forming the low refractive index layer is a coating containing 15% -30% of glass beads mixed in acrylic UV curing resin.
As a further improvement of the present invention, the humidity detection card is a single-sided humidity detection card or a double-sided humidity detection card, the single-sided humidity detection card includes a surface layer, a zeolite film, an indication layer and a substrate layer which are stacked from top to bottom, and the double-sided humidity detection card includes a surface layer, a zeolite film, an indication layer, a substrate layer, an indication layer, a zeolite film and a surface layer which are stacked from top to bottom.
The invention has the beneficial effects that: the humidity detection card has the advantages of humidity detection function, small size, low cost, reusability, convenience in storage and carrying, simplicity and flexibility in operation, visual measurement standard, environmental friendliness and capability of being used in daily life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other solutions can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a method of preparing a humidity sensitive ink for a humidity detection card according to the present invention.
FIG. 2 is an exploded view of a humidity sensor card according to the present invention.
FIG. 3 is a cross-sectional view of a humidity sensor card according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
A humidity sensitive ink for humidity detection card has humidity sensitive color change function, is an environment-friendly printing ink, and mainly comprises 0.1-9% of PH dye indicator, 1-13% of PH value regulator, 3.5-26.5% of water sensitive salt, 9-27% of binder, 4-27% of high boiling point hygroscopic agent, 4-18% of rheological agent, 0.1-4.5% of defoamer and 27-62.5% of organic solvent.
The specific description of each component is as follows:
1. and when the pH value in the ink is changed, the pH dye indicator can generate the change on the molecular structure according to different pH values and can be displayed by the visual effect of a color change process. The PH dye indicator herein may be selected from one or more of thymol blue, bromothymol blue, bromophenol blue, xylenol blue, cresol purple, bromocresol purple, m-cresol purple, methyl violet, gentian violet, cresol red, methyl red, neutral red, phenol red, methyl orange, methyl yellow, bromocresol green, malachite green, litmus, phenolphthalein, and blackcurrant red.
2. The PH value regulator is used for regulating the overall PH value of the ink for humidity detection in a specific range, and the PH value regulator is matched with a PH dye indicator to change the color of the ink in a specific humidity environment. The pH regulator may be one or more selected from sulfuric acid, nitric acid, citric acid, acetic acid, sodium hydroxide, and potassium hydroxide.
3. The water sensitive salt is a salt with crystal water being removed, is used as a sensitive element for sensing water vapor, and realizes the color change of the PH dye indicator by utilizing the difference of different PH values before and after the crystal water is lost. When the ink dries, the water sensitive salt loses crystal water, and the ink shows a first pH value; when the ink absorbs moisture, the water sensitive salt forms crystalline hydrates, at which point the ink exhibits a second pH. In the moisture absorption process, the color of the PH value sensitive dye contained in the ink changes back and forth, so that the effect of visualizing the humidity detection result is achieved. The water-sensitive salt can be one or more selected from sodium carbonate, copper sulfate, ferrous sulfate, zinc sulfate, aluminum potassium sulfate, calcium sulfate, sodium thiosulfate, magnesium nitrate and potassium carbonate.
4. The binder mainly has the function of providing proper viscosity for the printing ink, thereby endowing the printing ink with certain adhesive force and improving the surface wear resistance of a printing finished product. The binder can be one or more of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, associative polyurethane thickener, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soybean protein gum, natural rubber, lanolin, agar, polyacrylamide, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbomer resin, polyacrylate copolymer emulsion, polyurethane, modified polyurea and low molecular weight polyethylene wax.
5. The high boiling point moisture absorbent is used for enhancing the moisture absorption performance of the printing ink, so that the printing ink can generate a visual color change effect according to the change of external humidity. The reason for the high boiling point moisture absorber is that when the boiling point of the solvent is lower than 100 ℃, it may cause the nozzle of the inkjet printer head to be clogged, and the formed surface of the printed matter may have cracks or roughness. The hygroscopic agent can be one or more selected from magnesium sulfate, sodium sulfate, glycerol, ethylene glycol, glycerol, magnesium chloride and calcium chloride.
6. The rheological agent enables the ink to have good fluidity, and avoids the reduction of printing quality caused by the bad phenomena of uneven distribution or accumulation of the ink and the like in the printing process. The rheological agent can be selected from one or more of modified acrylate cross-linked copolymer and nonionic polyether urethane.
7. The defoaming agent is mainly used for improving the printing quality and improving the quality of printed products. This is because the air intake during grinding, toning and printing tends to cause a large amount of foam, both large and small, which can cause various production problems during printing, such as: leading to the problems of low production efficiency, increased energy consumption of equipment, surface defects of printed matters, difficulty in upgrading production and printing and the like. A large amount of medium with a foam stabilizing effect exists in the formula of solvent-based ink or water-based ink, and the defoaming agent is added into the ink to ensure the uniformity of the ink texture, so that the printing quality of the product is improved. The defoaming agent can be one or two of modified organic silicon emulsion and mineral oil.
8. Organic solvent (polyol), a basic solvent body for sufficiently mixing the components for preparing the humidity-sensitive color-changing ink, and simultaneously has the advantages of ensuring the fluidity of the obtained mixed solution, and being convenient for being applied to a nozzle of an ink-jet printer. The organic solvent can be selected from one or more of ethanol, isopropanol, methanol, etc. or combination with environment-friendly deionized water
As shown in fig. 1, a method for preparing a humidity sensitive ink for a humidity detection card specifically comprises the following processes:
the first step is as follows: dissolving water sensitive salt in deionized water, and fully stirring to prepare a first mixed solution;
the second step: dissolving a PH dye indicator in an organic solvent, and fully stirring to prepare a mixed solution II;
the third step: mixing the solution I and the solution II, and fully stirring to prepare a mixed solution III;
the fourth step: adding a pH regulator into the solution III, and fully stirring to obtain a mixed solution IV;
the fifth step: adding a binder with neutral pH into the solution IV, and fully stirring to prepare a mixed solution V;
and a sixth step: and adding the rheological agent and the defoaming agent into the solution V in sequence, and fully stirring to prepare the humidity-sensitive ink, which is also called humidity-sensitive color-changing ink.
The use of a pH adjuster in the ink formulation may be combined with a pH dye indicator to produce a color change. The PH of the bulk solution is adjusted by the addition of a PH adjuster such that the PH dye indicator in the ink now appears in a first color. When the outside humidity is increased, along with the uniform moisture absorption of the humidity card, the printing layer ink concentration is reduced, the PH value is increased, and the PH dye indicator presents a second color. Only when the ink concentration is reduced to a certain concentration due to the moisture absorption effect of the humidity card, the pH value of the ink is increased to the critical value of the color change of the pH dye indicator, so that the measurement accuracy is ensured.
A popular and visual humidity detection card mainly structurally comprises: a substrate layer 1, an indicating layer 2, a zeolite film 3 and a surface layer 4.
The substrate layer 1 is mainly used as a carrier of a humidity card, has no special requirement, and can be generally selected from common environment-friendly label paper.
The indicator layer 2, which may also be referred to as a print layer, includes a pattern layer 201 and an adhesive 202 printed using an environmentally friendly moisture sensitive ink having a moisture sensitive color change function, the ink layer having a thickness of 0.3um to 100 um.
The zeolite film 3 is a film made of a resin composition containing a zeolite component, and the film is in a white turbid state, and changes from the white turbid state to a transparent state with moisture absorption, and when the difference in optical density between the white turbid state and the transparent state is 0.05 or more, the printed layer pattern is visible.
The surface layer 4 is a low-refractive-index coating, and the coating for forming the low-refractive-index layer is a coating formed by mixing 15% -30% of glass beads in acrylic UV curing resin, so that the surface emission phenomenon under the irradiation of strong light sources such as sunlight or fluorescent lamps can be inhibited, and the condition that the color change state of a printed pattern in the humidity card detection process is possibly difficult to identify when the observation angle changes due to light reflection on the surface is avoided.
Different types of humidity cards can be manufactured by singly compounding or randomly combining and compounding the structural layers.
As shown in the attached figures 2 and 3, the double-sided humidity detection card is adopted, the structure can realize the double-sided readable function of the detection result of the humidity card, and a single-sided humidity detection card can also be adopted.
The printing layer is mainly printed by an ink-jet printer. The reason for this is that inkjet printing is a contactless, pressure-free, plateless printing. The non-contact printing is not limited by the texture of any material (the environment-friendly humidity-sensitive color-changing ink can be applied to different carriers for printing according to different purposes), and the adverse phenomena of printing scratch, uneven pattern texture and the like caused by printing pressure are avoided; the ink-jet printing can also utilize an electronic computer to store printing information, and the printing information can be printed when being input into an ink-jet printer, so that the printing patterns are more diverse; in addition, the ink-jet printing can be used for printing simple block color patterns, complex full-color patterns or patterns containing excessive colors in sequence without plate making, plate burning and color register, and the printed product has bright color, vivid effect, strong wear-resistant adhesive force and difficult fading.
The following is a humidity card printing ink formula for detecting whether the humidity value in the environment is within the optimal humidity range (45% RH-60% RH) of the human body or the skin aiming at the daily life scene (in an air-conditioned room, a beauty room, beside an office table or a bedroom) of people. (the total system weight is described below as 100%. the following formulation is used by way of example only and can be modified in the proportions of the formulation for different applications to obtain a wetness detector card for a particular application).
The first embodiment is as follows: 19 percent of association type polyurethane thickening agent with neutral PH value; 7% of nonionic polyether polyurethane; 0.2 percent of modified organic silicon solution; thymol blue 0.8%; 3% of acetic acid; 13% of ethylene glycol; 45% of deionized water and 12% of sodium carbonate.
Adding 12% of sodium carbonate into deionized water accounting for 45% of the total weight, mixing 13% of ethylene glycol and 0.8% of thymol blue, mixing the two obtained solutions, and stirring at the rotating speed of 500r/min for 1 hour at room temperature to obtain a solution I;
secondly, adding 3 percent acetic acid into the first solution, and continuously stirring at the rotating speed of 500r/min for 30min at room temperature to adjust the pH of the system to 4.5-5 to obtain a second solution;
thirdly, adding 19 percent of association type polyurethane thickener with neutral PH value into the second solution, heating the mixture to 80 ℃ in water bath at the rotating speed of 300r/min, stirring the mixture for 3 hours, then cooling the mixture to 50 ℃, preserving the heat for 30 minutes, and cooling the mixture to room temperature to obtain a third solution;
and fourthly, sequentially adding 7 percent of nonionic polyether type polyurethane and 0.2 percent of modified organic silicon emulsion into the solution III, and stirring at the rotating speed of 300r/min for 2 hours at room temperature to obtain the environment-friendly color-changing ink with the humidity-sensitive color-changing visualization function.
This example is used for the detection of an ambient humidity value of 40% RH. When the ambient humidity is 35% RH, the humidity sensitive color-changing ink is yellow, and when the ambient humidity is higher than 45%, the humidity sensitive color-changing ink is grass green. And the visualization process of changing yellow into turquoise is used as the detection basis under the environment humidity.
The second embodiment: 19 percent of association type polyurethane thickening agent with neutral PH value; 7% of nonionic polyether polyurethane; 0.2 percent of modified organic silicon solution; 1.2% of cresol purple; 3.6 percent of acetic acid; 16% of ethylene glycol; 41% of deionized water and 12% of sodium carbonate.
Adding 12% of sodium carbonate into deionized water accounting for 41% of the total weight, mixing 16% of ethylene glycol and 1.2% of cresol purple, mixing the two obtained solutions, and stirring at the rotating speed of 500r/min for 1 hour at room temperature to obtain a solution I;
adding 3.6 percent acetic acid into the solution I, and continuously stirring at the rotating speed of 500r/min at room temperature for 30min to adjust the pH of the system to 4.5-5 to obtain solution II;
thirdly, adding 19 percent of association type polyurethane thickener with neutral PH value into the second solution, heating the mixture to 80 ℃ in water bath at the rotating speed of 300r/min, stirring the mixture for 3 hours, then cooling the mixture to 50 ℃, preserving the heat for 30 minutes, and cooling the mixture to room temperature to obtain a third solution;
and fourthly, sequentially adding 7 percent of nonionic polyether polyurethane and 0.2 percent of modified organic silicon emulsion into the solution III, and stirring at the rotating speed of 300r/min for 2 hours at room temperature to obtain the environment-friendly color-changing ink with the humidity-sensitive color-changing visualization function.
This example is used for the detection at an ambient humidity value of 50% RH. When the ambient humidity is 45% RH, the humidity sensitive color-changing ink is yellow, and when the ambient humidity is higher than 55%, the humidity sensitive color-changing ink is purple. The visual process of changing yellow into purple is used as the detection basis under the environment humidity.
Example three: 19 percent of association type polyurethane thickening agent with neutral PH value; 7% of nonionic polyether polyurethane; 0.2 percent of modified organic silicon solution; 1.4% of cresol red; 3.4 percent of acetic acid; 17.5 percent of ethylene glycol; 39.5 percent of deionized water and 12 percent of sodium carbonate.
Adding 12% of sodium carbonate into deionized water accounting for 39.5% of the total weight of the system, mixing 17.5% of ethylene glycol and 1.4% of cresol red, mixing the two obtained solutions, and stirring at the rotating speed of 500r/min for 1 hour at room temperature to obtain a solution I;
adding 3.4 percent acetic acid into the first solution, and continuously stirring at the rotating speed of 500r/min at room temperature for 30min to adjust the pH of the system to 4.5-5 to obtain a second solution;
thirdly, adding 19 percent of association type polyurethane thickening agent with neutral PH value into the second solution, heating the mixture to 80 ℃ in water bath at the rotating speed of 300r/min, stirring the mixture for 3 hours, then cooling the mixture to 50 ℃, preserving the heat for 30 minutes, and cooling the mixture to room temperature to obtain a third solution;
and fourthly, sequentially adding 7 percent of nonionic polyether type polyurethane and 0.2 percent of modified organic silicon emulsion into the solution III, and stirring at the rotating speed of 300r/min for 2 hours at room temperature to obtain the environment-friendly color-changing ink with the humidity-sensitive color-changing visualization function.
This example is three-way for detection at an ambient humidity value of 60% RH. The humidity-sensitive color-changing ink is yellow when the ambient humidity is 55% RH, and is red when the ambient humidity is higher than 65%. And the visualization process of changing yellow into red is used as the detection basis under the environment humidity.
The humidity sensitive ink for the humidity detection card, the preparation method thereof and the humidity detection card provided by the invention have the following advantages:
1. the use of a PH dye indicator and a PH regulator in the ink preparation can realize specific humidity inspection and has an inspection process with visual color change; the use of water-sensitive salts in ink preparation can realize the reversibility of the humidity card detection process, and the humidity detection card has the characteristic of reusability.
2. Due to the arrangement of the coating with the low refractive index on the surface in the humidity detection card, the interference degree of light and an observation angle when the humidity detection result of the humidity card is observed is reduced; the zeolite film in the humidity detection card is arranged to provide a dual detection function for humidity detection, and the detection efficiency can be controlled by regulating the thickness of the film, so that the water vapor in the air is uniformly and stably absorbed and infiltrated into the ink layer patterns printed inside the humidity card, and the reliability of a detection result is ensured.
3. The ink suitable for printing of the ink-jet printer is prepared by carrying out certain requirements on ink blending components (such as a rheological agent for ensuring the fluidity of the ink, a binder for ensuring the adhesive force of the ink, a high-boiling-point wetting agent for ensuring the moisture absorption capacity of the ink and preventing the ink from blocking a nozzle of the ink-jet printer, and the like), so that the development of high-tech digital printing is promoted while the printing quality is ensured.
4. The humidity detection card has the advantages of humidity detection function, small volume, low cost, reusability, convenience for storage and carrying, simplicity and flexibility in operation, visual measurement standard and capability of meeting modern process requirements.
5. By changing the combination of the humidity detection card manufacturing structures, different types of humidity detection cards can be realized, for example: single-sided humidity detection cards, double-sided humidity detection cards and the like.
6. The ink jet printing adopts high-tech digital ink jet printing equipment, realizes the high-efficiency production without pressure, contact and printing plate, avoids the bad phenomena of uneven ink texture or scratch and the like caused by humidity card in the printing process, and can realize high-quality batch type customized production.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A humidity sensitive ink for a humidity detection card, comprising: comprises a PH dye indicator, a PH value regulator, water sensitive salt, a binder, a high boiling point hygroscopic agent, a rheological agent, a defoaming agent and an organic solvent.
2. The humidity sensitive ink for humidity detection card according to claim 1, wherein: the moisture-sensitive ink comprises, by weight, 0.1% -9% of a pH dye indicator, 1% -13% of a pH value regulator, 3.5% -26.5% of a water-sensitive salt, 9% -27% of a binder, 4% -27% of a high-boiling-point moisture absorbent, 4% -18% of a rheological agent, 0.1% -4.5% of an antifoaming agent, and 27% -62.5% of an organic solvent.
3. The humidity sensitive ink for humidity detection card according to claim 1, wherein: the PH dye indicator comprises any one or any combination of thymol blue, bromothymol blue, bromophenol blue, xylenol blue, cresol purple, bromocresol purple, m-cresol purple, methyl purple, gentian purple, cresol red, methyl red, neutral red, phenol red, methyl orange, methyl yellow, bromocresol green, malachite green, litmus, phenolphthalein and black currant red;
the pH regulator comprises any one or any combination of sulfuric acid, nitric acid, citric acid, acetic acid, sodium hydroxide and potassium hydroxide.
4. The humidity sensitive ink for humidity detection card according to claim 1, wherein: the water sensitive salt comprises any one or any combination of sodium carbonate, copper sulfate, ferrous sulfate, zinc sulfate, aluminum potassium sulfate, calcium sulfate, sodium thiosulfate, magnesium nitrate and potassium carbonate;
the binder comprises any one or any combination of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, associative polyurethane thickener, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soybean protein gum, natural rubber, lanolin, agar, polyacrylamide, polyvinylpyrrolidone, polyethylene oxide, modified paraffin resin, carbomer resin, polyacrylate copolymer emulsion, polyurethane, modified polyurea and low molecular weight polyethylene wax.
5. The humidity sensitive ink for a humidity detection card according to claim 1, wherein: the high boiling point moisture absorbent comprises any one or any combination of magnesium sulfate, sodium sulfate, glycerol, glycol, glycerol, magnesium chloride and calcium chloride;
the rheological agent comprises any one or any combination of modified acrylate cross-linked copolymer and nonionic polyether polyurethane.
6. The humidity sensitive ink for humidity detection card according to claim 1, wherein: the defoaming agent comprises any one or any combination of modified organic silicon emulsion and mineral oil;
the organic solvent comprises any one or any combination of ethanol, isopropanol and methanol, or deionized water.
7. A preparation method of humidity sensitive ink for a humidity detection card is characterized by comprising the following steps:
s1, dissolving the water sensitive salt in deionized water, and fully stirring to obtain a solution I;
s2, dissolving the PH dye indicator in an organic solvent, and fully stirring to obtain a solution II;
s3, mixing the solution I and the solution II, and fully stirring to obtain a solution III;
s4, adding a pH regulator into the solution III, and fully stirring to obtain a solution IV;
s5, adding a binder with neutral PH into the solution IV, and fully stirring to obtain a solution V;
s6, adding a rheological agent and a defoaming agent into the solution V in sequence, and fully stirring to obtain the humidity-sensitive ink as claimed in any one of claims 1 to 6.
8. A humidity detection card, characterized in that: comprises a substrate layer, an indicating layer, a zeolite film and a surface layer, wherein,
the basal layer is a cut body of the humidity detection card;
an indicator layer, also called a print layer, disposed on the substrate layer, comprising a pattern layer printed using the moisture sensitive ink as claimed in any one of claims 1 to 6;
the zeolite film is arranged on the indicating layer and is made of a resin composition containing a zeolite component;
the surface layer is arranged on the zeolite film and is a low-refractive-index coating.
9. A humidity detection card as in claim 8, wherein: the printing ink layer thickness of pattern layer is 0.3um-100um, the packing has the adhesive around the pattern layer, the pattern layer adopts ink jet printer printing to form.
10. A humidity detection card as in claim 8, wherein: the paint for forming the low-refractive-index layer is a paint mixed with acrylic UV curing resin and containing 15% -30% of glass beads, the humidity detection card is a single-sided humidity detection card or a double-sided humidity detection card, the single-sided humidity detection card comprises a surface layer, a zeolite film, an indication layer and a substrate layer which are stacked from top to bottom, and the double-sided humidity detection card comprises a surface layer, a zeolite film, an indication layer, a substrate layer, an indication layer, a zeolite film and a surface layer which are stacked from top to bottom.
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| WO2021219754A1 (en) * | 2020-04-30 | 2021-11-04 | Societe Bic | Water-based ink composition with color-changing by evaporation |
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