Critical temperature indicating ink and critical temperature indicating label

Abstract

The invention discloses critical temperature indicating ink and a critical temperature indicating label, and the critical temperature indicating ink is prepared from the following raw materials in parts by mass: 30-50 parts of a connecting material; 40 to 60 parts of a solvent; the coating material particle is provided with a core layer and a shell layer, the core layer has a first color, the shell layer has a second color, when the environment temperature reaches a preset critical temperature, the coating material particle is broken, and the critical temperature indicating ink is changed from the first color to the second color. The critical temperature indicating ink and the coating material particles are provided with the core layer and the shell layer, the shell layer has the first color, the core layer has the second color, and when the environment temperature reaches the preset critical temperature, the core layer can enable the shell layer to be broken through pressure change, so that the second color of the core layer is presented through a gap between the shell layers; therefore, it can be indicated that the environment temperature is higher than the preset critical temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, and in particular to a critical temperature indicating ink and a critical temperature indicating label. Background Art

[0002] Medical devices, food processing processes and tableware usually require high temperature disinfection. In order to detect whether the temperature of the disinfection process meets the standard, sterilization indicator labels are usually used for monitoring. The color change principle of the sterilization indicator label is: the indicator component contains bismuth compounds and sulfur sources. When the bismuth compound and the sulfur source are exposed to a high-temperature water vapor environment, the two react to generate a compound system under alkaline conditions. The color changes in this process, but there are two problems with this chemical indicator composition: first, bismuth has a certain degree of radioactivity, and long-term contact will be harmful to the human body; second, the procurement cost of bismuth is high. Summary of the invention

[0003] Based on this, it is necessary to provide a critical temperature indicating ink and a critical temperature indicating label to solve the above problems.

[0004] A critical temperature indicating ink, measured by mass, the raw materials for preparing the critical temperature indicating ink include the following components:

[0005] 30 to 50 parts of connecting material;

[0006] 40 to 60 parts of solvent; and

[0007] 5 to 20 parts of coating material particles;

[0008] The coating material particles have a core layer and a shell layer, the core layer has a first color, and the shell layer has a second color. When the ambient temperature reaches a preset critical temperature, the coating material particles rupture, and the critical temperature indicates that the ink changes from the first color to the second color.

[0009] In one embodiment, the core layer is made of a thermally expandable material.

[0010] In one embodiment, the thermal expansion material is expanded graphite or expanded boron nitride.

[0011] In one embodiment, the core layer is made of a thermally decomposed material.

[0012] In one embodiment, the thermal decomposition material is selected from any one of nitrates, carbonates, sparingly soluble hydroxides and acid salts.

[0013] In one embodiment, the shell layer is made of metal or metal oxide.

[0014] In one embodiment, the metal is selected from any one of copper, aluminum, zinc, silver, nickel and tin.

[0015] In one embodiment, the metal oxide is selected from any one of nickel oxide, molybdenum oxide, copper oxide, iron oxide and aluminum oxide.

[0016] The above-mentioned critical temperature indicating ink comprises coating material particles, the coating material particles have a core layer and a shell layer, the shell layer has a first color, and the core layer has a second color. When the ambient temperature reaches a preset critical temperature, the core layer can cause the shell layer to rupture through pressure changes, so that the second color of the core layer can be presented through the gap between the shell layers, thereby causing the critical temperature indicating ink to change color, thereby indicating that the ambient temperature is higher than the preset critical temperature.

[0017] The beneficial effects of the critical temperature indicating ink include: (1) the critical temperature indicating ink does not contain radioactive elements and is safe and reliable; (2) the material cost is low, which is conducive to the promotion of the product thermal expansion material.

[0018] A critical temperature indicating label comprises a base layer and an indicating layer which are stacked together, wherein the indicating layer is printed by any one of the above-mentioned critical temperature indicating inks.

[0019] In one embodiment, a protective layer is disposed above the indicating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the coating material particles before rupture;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the coating material particles after rupture;

[0022] Figure 3 It is a schematic diagram of the critical temperature indicating label structure according to one embodiment;

[0023] Figure 4 FIG. 4 is a schematic diagram of the critical temperature indicating label structure according to another embodiment. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" or "communicated" with another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "upper", "lower", "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] The critical temperature indicating ink and the critical temperature indicating label are further described in detail below mainly in conjunction with the accompanying drawings and specific embodiments.

[0027] A critical temperature indicating ink according to one embodiment includes 30 to 50 parts of a connecting material, 40 to 60 parts of a solvent, and 5 to 20 parts of coating material particles.

[0028] The binder, calculated by weight, has a weight portion of 30 to 50 parts. The binder can be dissolved in a solvent and is used to allow the critical temperature indicating ink to dry into a film after printing.

[0029] Optionally, the connecting material is selected from at least one of acrylic resin, polyurethane epoxy resin, polyketone resin, polyamide resin, linseed oil, rosin-modified phenolic resin, alkyd resin and polyurethane alkyd resin.

[0030] The solvent, calculated by weight, has a weight portion of 40 to 60 parts, and is used to dissolve the linker so that the ink meets the printability requirements.

[0031] Optionally, the solvent is selected from at least one of aliphatic solvents, aromatic solvents, cycloalkane solvents, alcohol solvents, ester solvents, ketone solvents or water.

[0032] It should be understood that when some offset inks, screen printing inks, flexographic inks or gravure inks contain the above-mentioned proportions of the binder and the solvent, they can be directly used as components of the binder and the solvent of the present invention.

[0033] The coated material particles, with a mass fraction of 5 to 20 parts, are used as pigments for critical temperature indicating ink. When the ambient temperature reaches a preset critical temperature, the coated material particles may change color.

[0034] Specifically, see Figure 1 and Figure 2 The coating material particles have a shell layer 01 and a core layer 02, and the shell layer 01 and the core layer 02 form a core-shell structure.

[0035] The shell layer 01 is disposed on the outer surface of the coating material particles. The shell layer 01 has a first color, and the first color can cover the second color of the core layer 02, so that the coating material particles show the first color to the outside. When the pressure of the core layer 02 disposed in the shell layer 01 is greater than the bearing capacity of the shell layer 01, the shell layer 01 may rupture under the pressure, so that the second color of the core layer 02 can be presented through the gap between the shell layers 01, thereby changing the color of the critical temperature indicating ink.

[0036] Optionally, the shell layer 01 is a metal or a metal oxide.

[0037] The metal as the shell layer 01 has a good covering effect and can completely cover the second color of the core layer 02. The metal can be prepared by chemical electroplating, ultrasonic electroplating, hydrogen reduction, chemical vapor deposition, etc., so that the metal as the shell layer 01 is firmly attached to the outer surface of the core layer 02.

[0038] Optionally, the metal includes, but is not limited to, copper, aluminum, zinc, silver, nickel, or tin.

[0039] The metal oxide as the shell layer 01 can be prepared by an interface induced nucleation method, a chemical reduction method, a hydrothermal method and a sol-gel method, so that the metal oxide as the shell layer 01 is firmly attached to the outer surface of the core layer 02 .

[0040] Optionally, the metal oxide includes, but is not limited to, nickel oxide, molybdenum oxide, copper oxide, iron oxide or aluminum oxide.

[0041] The core layer 02 is arranged in the inner layer of the coating material particles. The core layer 02 has a second color. When the ambient temperature reaches a preset temperature, the core layer 02 can cause the shell layer 01 to rupture through pressure changes, so that the second color of the core layer 02 can be presented through the gap between the shell layers 01, thereby changing the color of the critical temperature indicating ink.

[0042] In this embodiment, the core layer 02 is made of a thermal expansion material. When the ambient temperature reaches a preset critical temperature, the molecular structure of the thermal expansion material undergoes a physical change to expand its volume. The pressure generated by the expansion of the core layer 02 causes the shell layer 01 to rupture.

[0043] Optionally, the thermal expansion material is expanded graphite or expanded boron nitride.

[0044] Expanded graphite has a second color of black. Expanded graphite crystals are composed of a hexagonal plane layered structure of carbon atoms in sp2 hybrid orbitals. The carbon atoms in the layer are bonded by strong covalent bonds, while the layers are bonded by weaker van der Waals forces, and the interlayer spacing is large. Under certain conditions, chemical substances such as acids, alkali metals, and salts can be inserted into the graphite interlayer to form graphite intercalation compounds. When this interlayer compound reaches a preset critical temperature, it will rapidly decompose to produce a large amount of gas, which will drive the graphite layer to expand rapidly along the axial direction to form worm-like expanded graphite. In this process, its volume can instantly expand by dozens to hundreds of times. Under the pressure of the core layer 02, the shell layer 01 will instantly rupture, thereby changing the color of the coated material particles from the first color to the second color instantly.

[0045] Expanded boron nitride is also called white graphite, which has a second color of white. Expanded boron nitride crystals have the same hexagonal plane layered structure as expanded graphite. Therefore, the two have the same physical properties. When the ambient temperature reaches the preset critical temperature, their volume will also expand rapidly.

[0046] The beneficial effects of using thermal expansion material as the core layer 02 include: (1) The volume expansion of the thermal expansion material is completed instantly, so the color change effect of the coating material particles is completed instantly and is irreversible; (2) Since the expansion coefficient of the thermal expansion material can reach tens to hundreds of times, during the expansion process, the shell layer 01 will be swallowed up by the core layer 02. At this time, the second color can completely cover the first color, there is no intermediate color, and the color change effect is significant; (3) The expansion temperature of the thermal expansion material can be controlled by adjusting the chemical substances inserted between the layers. The minimum starting expansion temperature can be as low as 70°C, which has a wide range of applications; (4) When the color of the coating material particles changes, the volume also changes significantly, which has a dual indication effect.

[0047] It should be understood that other materials whose molecular structures undergo physical changes and result in volume expansion after heating can also be used as the core layer 02 of the present invention.

[0048] In another embodiment, the core layer 02 is made of a thermal decomposition material. When the ambient temperature reaches a preset critical temperature, the thermal decomposition material undergoes a chemical decomposition reaction to release gas, which greatly increases the pressure of the core layer 02 and causes the core-shell structure to rupture.

[0049] Thermal decomposition materials include, but are not limited to, nitrates, carbonates, sparingly soluble hydroxides and acid salts. Nitrates can be decomposed to generate oxygen when heated, carbonates can be decomposed to generate carbon dioxide when heated, and sparingly soluble hydroxides can be decomposed to generate metal oxides and water vapor when heated.

[0050] Optionally, the nitrate includes, but is not limited to, sodium nitrate, potassium nitrate, ammonium nitrate and calcium nitrate.

[0051] Optionally, the carbonate includes, but is not limited to, sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, copper carbonate and ammonium carbonate.

[0052] Optionally, the sparingly soluble hydroxide includes, but is not limited to, sodium hydroxide, ferric hydroxide, ferrous hydroxide, zinc hydroxide, and aluminum hydroxide.

[0053] Preferably, the particle size of the coating material particles is 50 nm to 5000 nm, so that it meets the requirements of printability.

[0054] In another embodiment, the critical temperature indicating ink further includes 0.5 to 1 part of a defoaming agent, and the defoaming agent is used to prevent bubbles from being generated in the ink.

[0055] Optionally, the defoaming agent includes, but is not limited to: a polyether block defoaming agent, a silicone defoaming agent and a composite defoaming agent.

[0056] In another embodiment, the critical temperature indicating ink further comprises 0.5 to 1 part of a leveling agent, and the leveling agent can keep the water-sensitive anti-counterfeiting ink in a flat state during the printing process.

[0057] Optionally, the leveling agent includes, but is not limited to: polydimethylsiloxane, fluorinated siloxane, silicone oil, polyether polyester modified organic siloxane, alkyl modified organic siloxane and acrylate.

[0058] The above-mentioned critical temperature indicating ink comprises coating material particles, the coating material particles have a core layer 02 and a shell layer 01, the shell layer 01 has a first color, and the core layer 02 has a second color. When the ambient temperature reaches a preset critical temperature, the core layer 02 can cause the shell layer 01 to rupture through pressure changes, so that the second color of the core layer 02 can be presented through the gap between the shell layers 01, thereby changing the color of the critical temperature indicating ink, and therefore, indicating that the ambient temperature is higher than the preset critical temperature.

[0059] The beneficial effects of the critical temperature indicating ink include: (1) the critical temperature indicating ink does not contain radioactive elements and is safe and reliable; (2) the material cost is low, which is conducive to the promotion of the product thermal expansion material.

[0060] See also Figure 3 A critical temperature indicating label according to one embodiment includes a base layer 10 and an indicating layer 20 which are stacked.

[0061] The base layer 10 is used to carry the indicating layer 20. Optionally, the material of the base layer 10 includes but is not limited to: paper, PVC film, PET film, PP film.

[0062] The indicator layer 20 is stacked on the base layer 10 and is obtained by printing any one of the above critical temperature indicating inks.

[0063] In another embodiment, see Figure 4 The critical temperature indicating label further includes a protective layer 30 , which is stacked on a side of the indicating layer 20 away from the base layer 10 , and the protective layer 30 protects the indicating layer 20 .

[0064] The above-mentioned critical temperature indicating label, the indicating layer 20 is printed by critical temperature indicating ink, the critical temperature indicating ink composition includes coating material particles, the coating material particles have a core layer 02 and a shell layer 01, the shell layer 01 has a first color, and the core layer 02 has a second color. When the ambient temperature reaches the preset critical temperature, the core layer 02 can cause the shell layer 01 to rupture through pressure changes, so that the second color of the core layer 02 can be presented through the gap between the shell layers 01, thereby changing the color of the critical temperature indicating ink, thereby indicating that the ambient temperature is higher than the preset critical temperature.

[0065] The following are specific embodiments.

[0066] Example 1

[0067] This embodiment provides a critical temperature indicating ink, including 30 parts of a connecting material, 40 parts of a solvent, and 5 parts of coating material particles. In this embodiment, the connecting material is acrylic resin, the solvent is isopropyl alcohol, and the coating material particles are copper-coated expanded boron nitride particles.

[0068] The above-mentioned critical temperature indicating ink comprises coating material particles, and the coating material particles have a core layer 02 and a shell layer 01. The shell layer 01 has a first color of brass, and the core layer 02 has a second color of white. When the ambient temperature reaches a preset critical temperature, the core layer 02 can cause the shell layer 01 to rupture through pressure changes, so that the second color of the core layer 02, black, can be presented through the gap between the shell layers 01, thereby changing the color of the critical temperature indicating ink, and therefore, it can indicate that the ambient temperature is higher than the preset critical temperature.

[0069] The beneficial effects of the critical temperature indicating ink include: (1) the critical temperature indicating ink does not contain radioactive elements and is safe and reliable; (2) the material cost is low, which is conducive to the promotion of the product thermal expansion material.

[0070] See also Figure 3 In this embodiment, a critical temperature indicating label is also provided. The critical temperature indicating label includes a stacked base layer 10 and an indicating layer 20, wherein the base layer 10 is paper, and the indicating layer 20 is printed by the critical temperature indicating ink provided in this embodiment.

[0071] Example 2

[0072] This embodiment provides a critical temperature indicating ink, including 40 parts of a connecting material, 50 parts of a solvent, and 12 parts of coating material particles. In this embodiment, the connecting material is polyurethane epoxy resin, the solvent is ethanol, and the coating material particles are aluminum-coated expanded graphite particles.

[0073] The above critical temperature indicating ink has the same performance as that of Example 1.

[0074] See also Figure 4 In this embodiment, a critical temperature indicating label is also provided, which includes a stacked base layer 10, an indicating layer 20 and a protective layer 30, wherein the base layer 10 is paper, the indicating layer 20 is printed by the critical temperature indicating ink provided in this embodiment, and the protective layer 30 is a PP film.

[0075] Example 3

[0076] This embodiment provides a critical temperature indicating ink, including 50 parts of a connecting material, 60 parts of a solvent, and 20 parts of coating material particles. In this embodiment, the connecting material is acrylic resin, the solvent is acetone, and the coating material particles are copper oxide coated sodium carbonate particles.

[0077] The above critical temperature indicating ink presents the first color black before the temperature reaches the critical temperature. After the temperature reaches the critical temperature, the coating material particles rupture under pressure, and the color of the core layer 02 can be presented through the gap of the shell layer 01. At this time, the critical temperature indicating ink presents a mixed color gray of the first color black and the second color white.

[0078] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A critical temperature indicating ink, characterized in that: The raw materials for preparing the critical temperature indicating ink include the following components measured by mass: 30 to 50 parts of connecting material; 40 to 60 parts of solvent; and 5 to 20 parts of coating material particles; The coating material particles have a core layer and a shell layer, the core layer has a first color, and the shell layer has a second color. When the ambient temperature reaches a preset critical temperature, the coating material particles rupture, and the critical temperature indicates that the ink changes from the first color to the second color.

2. The critical temperature indicating ink according to claim 1, characterized in that: The core layer is made of thermal expansion material.

3. The critical temperature indicating ink according to claim 2, characterized in that: The thermal expansion material is expanded graphite or expanded boron nitride.

4. The critical temperature indicating ink according to claim 1, characterized in that: The core layer is made of thermal decomposition material.

5. The critical temperature indicating ink according to claim 4, characterized in that: The thermal decomposition material is selected from any one of nitrates, carbonates, sparingly soluble hydroxides and acid salts.

6. The critical temperature indicating ink according to claim 1, characterized in that: The shell layer is made of metal or metal oxide.

7. The critical temperature indicating ink according to claim 6, characterized in that: The metal is selected from any one of copper, aluminum, zinc, silver, nickel and tin.

8. The critical temperature indicating ink according to claim 6, characterized in that: The metal oxide is selected from any one of nickel oxide, molybdenum oxide, copper oxide, iron oxide and aluminum oxide.

9. A critical temperature indicating label, characterized in that: The invention comprises a base layer and an indicator layer which are stacked, and the indicator layer is obtained by printing and drying the critical temperature indicating ink according to any one of claims 1 to 8.

10. The critical temperature indicating label according to claim 9, characterized in that: A protective layer is arranged above the indicating layer.

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