Color-changing inks, activated inks, and timer labels

Abstract

The present invention discloses a color-changing ink, an activation ink, and a timing label. The color-changing ink, measured in parts by mass, comprises the following raw materials: 15 to 45 parts of a binder; 5 to 20 parts of a carotenoid; and 20 to 50 parts of a first solvent. The activation ink, measured in parts by mass, comprises the following raw materials: 35 to 60 parts of a pressure-sensitive adhesive; 1 to 10 parts of an activation material; and 15 to 40 parts of a second solvent. The activation material comprises an activation component that reacts with the carotenoid to produce a color. A timing label comprises a color-changing component and an activation component. The color-changing component comprises a color-changing layer and a first substrate layer that are stacked together. The activation component comprises an activation layer and a second substrate layer that are stacked together. The color-changing layer comprises a color-changing region that is obtained by printing the color-changing ink, and the activation layer is obtained by printing the activation ink. In the timing label, the color change rate of the color-changing layer depends on the migration rate of the activation component in the activation layer, and the timing accuracy is greatly enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, and in particular to a color-changing ink, an activated ink and a timing label. Background Art

[0002] Existing timing labels often feature a color-changing area printed with color-changing ink. The timing principles typically include the following: First, the color-changing ink reacts with oxygen or carbon dioxide in the air, causing the color of the color-changing area to gradually change, allowing the time to be determined by color comparison. Second, the color-changing area contains a volatile dye, which evaporates, causing the color of the color-changing area to gradually change, allowing the time to be determined by color comparison. Third, the color-changing area contains a non-neutral volatile substance and a pH dye. As the non-neutral volatile substance evaporates, the pH dye changes color as the pH value of the color-changing area changes, causing the color to gradually change, allowing the time to be determined by color comparison. Regardless of the type of timing label, its color change rate is significantly affected by the airflow velocity of the surrounding environment. For example, if the same timing device is placed in different corners of a room, the different airflow velocities will result in different color change rates, resulting in generally low timing accuracy.

[0003] In view of this, it is necessary to provide a color-changing ink, an activated ink and a timing label to solve the above problems. Summary of the Invention

[0004] A first aspect of the present invention provides a color-changing ink.

[0005] A color-changing ink, wherein the raw materials for preparing the color-changing ink include the following components, measured in parts by mass:

[0006] 15 to 45 parts of connecting material;

[0007] 5 to 20 parts of carotenoids; and

[0008] 20 to 50 parts of the first solvent.

[0009] After the color-changing ink is printed and dried, the color-changing ink layer has a first color due to the presence of carotenoids. When the carotenoids come into contact with the activating material, the color-changing ink can change from the first color to the second color.

[0010] The second aspect of the present invention provides an activated ink to activate the color-changing ink provided by the first aspect of the present invention.

[0011] An activated ink for activating the color-changing ink according to any one of the first aspects of the present invention, wherein the color-changing ink comprises carotenoids. The raw materials for preparing the activated ink comprise the following components, measured in parts by mass:

[0012] 35 to 60 parts of pressure-sensitive adhesive;

[0013] 1 to 10 parts of activating material; and

[0014] 15 to 40 parts of the second solvent;

[0015] The activation material includes an activation component, and the activation component can react with the carotenoid to produce a color reaction.

[0016] After the activated ink is printed and dried, the activated ink layer has the characteristics of a pressure-sensitive adhesive. The activated component has a large migration rate in the form of a pressure-sensitive adhesive. When the activated component contacts the carotenoid through migration, the carotenoid can undergo a color gradient.

[0017] The third aspect of the present invention further provides a timing label, which is prepared using the color-changing ink provided by the first aspect of the present invention and the activated ink provided by the second aspect of the present invention.

[0018] A timing tag, comprising:

[0019] A color-changing component comprising a color-changing layer and a first substrate layer stacked together, wherein the color-changing layer comprises a color-changing region, the color-changing region being printed with the color-changing ink provided by the first aspect of the present invention, wherein the color-changing ink comprises carotenoid; and

[0020] The activation component comprises an activation layer and a second substrate layer which are stacked together. The activation layer is obtained by printing the activation ink provided by the first aspect of the present invention. The activation ink comprises an activation material which comprises an activation component.

[0021] In one embodiment, 0.5 to 2 parts of a pH regulator are further included.

[0022] In one embodiment, the carotenoids include: carotene, xanthophylls, esters of xanthophylls and carotene acid.

[0023] In one embodiment, the activating component is a heavy metal ion.

[0024] In one embodiment, the heavy metal ions are iron ions or copper ions.

[0025] In one embodiment, 0.01 to 0.5 parts of a moisture absorbent is further included.

[0026] In one embodiment, the hygroscopic agent is selected from any one of calcium chloride, magnesium chloride, lithium chloride and glycerol.

[0027] In one embodiment, the color-changing component and the activation component are stacked or laterally connected.

[0028] Before activation, the color-changing region and the activation layer are isolated and therefore not in direct contact, and the timing label is in a dormant state. After activation, the color-changing component and the activation component are bonded together, and the color-changing region and the activation layer are in direct contact. Activating components in the activation layer can migrate into the color-changing region and react with carotenoids in the color-changing region to change color. As the activating components migrate, the color of the color-changing region gradually changes from an initial first color to a second color. Therefore, the degree of color change can be used to indicate the passage of time.

[0029] The beneficial effects of the above-mentioned timing label are as follows: after the timing label is activated, since the color-changing layer and the activation layer are in a sealed connection state, the color change rate of the color-changing layer depends on the migration rate of the activated components in the activation layer, and the migration rate of the activated material is independent of the ambient air flow rate. Therefore, compared with traditional timing labels, the timing accuracy of the above-mentioned timing label is greatly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a timing tag before activation according to one embodiment;

[0031] Figure 2 For example Figure 1 The schematic diagram of the structure after the timing tag is activated is shown;

[0032] Figure 3 This is a schematic diagram of the structure of another embodiment of the timing tag before activation;

[0033] Figure 4 For example Figure 3 The schematic diagram of the structure after the timing tag is activated is shown;

[0034] Figure 5 This is a schematic diagram of the structure of another embodiment of the timing tag before activation;

[0035] Figure 6 For example Figure 5 The schematic diagram of the structure after the timing tag is activated is shown;

[0036] Figure 7 This is a schematic diagram of the structure of another embodiment of the timing tag before activation;

[0037] Figure 8 For example Figure 7 The schematic diagram of the structure after the timing tag is activated is shown. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] 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 an intermediate element. When an element is considered to be "connected" or "communicating" with another element, it may be directly connected to the other element or there may be an intermediate element. The terms "upper," "lower," "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0040] The following is a further detailed description of the color-changing ink provided by the first aspect, the activation ink provided by the second aspect, and the timing label provided by the third aspect of the present invention, mainly with reference to the accompanying drawings and specific embodiments.

[0041] The color-changing ink of one embodiment is prepared from raw materials comprising the following components, measured in parts by mass: 15 to 45 parts of a binder, 5 to 20 parts of carotenoids, and 20 to 50 parts of a first solvent.

[0042] The binder has a mass fraction of 15 to 45 parts and can be dissolved in the first solvent. In the color-changing ink, the binder plays a role in drying and forming a film, so that the color-changing ink can be firmly attached to the surface of the object after drying.

[0043] In this embodiment, the binder is a water-based polyurethane resin. It should be understood that other types of binders can also be used as the binder of the color-changing ink of the present invention.

[0044] Carotenoids are used as pigments for color-changing inks. The mass fraction of carotenoids is 5 to 20 parts. After contacting with the activation component of the activation material, a color change reaction occurs, and the color changes from the initial first color to the second color.

[0045] Specifically, carotenoids are a general term for compounds with a 040 tetraterpene structure and their derivatives, which are composed of 8 isoprenoid units. Carotenoids can be divided into four subfamilies: (1) carotenes, such as α-carotene, β-carotene, γ-carotene and lycopene; (2) xanthophylls, such as lutein, zeaxanthin and astaxanthin; (3) esters of xanthophylls, such as β-apo-carotene; and (4) carotene acids, such as safranin and carotene.

[0046] Carotenoids have an initial primary color, typically yellow, orange-red, or red. They possess strong tinting power, a stable and uniform color, and can coexist with elements such as potassium, zinc, and calcium without discoloration. Furthermore, carotenoids can undergo a color change reaction with the activating components of the activating material, causing the carotenoid to fade from its initial primary color to a colorless secondary color.

[0047] In one embodiment, the carotenoid is gardenia yellow pigment. Since gardenia yellow pigment has good solubility in solvent water and good light resistance and heat resistance in a neutral or alkaline environment, the color-changing ink can have a more uniform coloring effect and better stability.

[0048] The first solvent is used to dissolve the connecting material, and its mass fraction is 20 to 50 parts.

[0049] In this embodiment, the first solvent is water. When the carotenoid is a water-soluble material, the first solvent can also be used to dissolve the carotenoid.

[0050] Preferably, the first solvent is deionized water, which does not contain hydrogen ions. Hydrogen ions, as electrophilic reagents, can destroy the unsaturated conjugated double bonds in carotenoids. This process can cause the carotenoids to change color. Therefore, an ink system environment that does not contain hydrogen ions is conducive to improving the stability of carotenoids.

[0051] In another embodiment, the color-changing ink further comprises 0.5 to 2 parts of a pH adjuster. By adding the pH adjuster, the color-changing ink system is kept in an alkaline environment, which is beneficial for significantly improving the light and heat resistance of the carotenoids.

[0052] Optionally, the pH regulator includes but is not limited to sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.

[0053] In another embodiment, the color-changing ink further includes 0.05 to 0.1 parts of a pigment stabilizer, which can prevent the negative interference of trace activating components mixed in the ink system on carotenoids.

[0054] Optionally, pigment stabilizers include, but are not limited to, disodium EDTA.

[0055] In another embodiment, the color-shifting ink also includes 3 to 8 parts of an inclusion agent. The inclusion agent molecules have a cavitation structure. When added to the color-shifting ink, the carotenoids can enter these cavities to form inclusion compounds, altering their microenvironment. The inclusion compound structure can inhibit color changes caused by factors such as light, heat, acidity, alkali, and oxidation, thereby enhancing the stability of the color-shifting ink. Fortunately, experiments have found that adding an inclusion agent to the color-shifting ink can also help extend the color change period of the color-shifting ink after activation.

[0056] Optionally, the inclusion agent includes but is not limited to: crown ether, cyclodextrin, calixarene, calixpyrrole, calixcarbazole, cucurbituril and pillararene.

[0057] After the color-changing ink is printed and dried, the color-changing ink layer has a first color due to the presence of carotenoids. When the carotenoids come into contact with the activating material, the color-changing ink can fade from the initial first color to a second color.

[0058] The activated ink of one embodiment is prepared from raw materials comprising the following components, measured in parts by mass: 35 to 60 parts of a pressure-sensitive adhesive, 1 to 10 parts of an activating material, and 15 to 40 parts of a second solvent.

[0059] The pressure-sensitive adhesive acts as a binder for the activated ink. The weight of the pressure-sensitive adhesive is 35 to 60 parts by weight. After drying, the film has the characteristics of a pressure-sensitive adhesive. The pressure-sensitive adhesive not only acts as an adhesive but also promotes the migration of the activated components in the activated material.

[0060] In the present embodiment, the pressure-sensitive adhesive is an acrylate type pressure-sensitive adhesive, which is a copolymer of acrylates and other vinyl monomers. Comonomers are divided into main monomers, secondary monomers and functional monomers. The main monomers include butyl acrylate, etc., which provide toughness and adhesion. Secondary monomers include methyl methacrylate, styrene, etc., which are hard monomers that can provide rigidity and cohesive strength. Functional monomers are monomers containing other functional groups, for example, hydroxyethyl methacrylate, etc., which can play a cross-linking role in the polymerization process and further improve adhesion, cohesion and heat-resistant creep properties. This monomer combination makes the copolymer have the characteristics of a pressure-sensitive adhesive. The acrylate type pressure-sensitive adhesive has excellent weather resistance, heat resistance and adhesive layer transparency. At the same time, the acrylate type pressure-sensitive adhesive also has good phase separation and migration.

[0061] It should be pointed out that, since acrylic pressure-sensitive adhesives have good migration properties, after the activated ink dries, the activated components dispersed in the activated ink can migrate in the film layer along with the pressure-sensitive adhesive at a relatively fast speed.

[0062] Optionally, the acrylate pressure-sensitive adhesive includes but is not limited to: water-based acrylic emulsion and water-based acrylic resin.

[0063] It should be understood that other pressure-sensitive adhesives with good migration phenomena can also be used as the pressure-sensitive adhesive of the present invention.

[0064] The activation material is used to activate carotenoids to change their color, and its mass portion is 1 to 10 parts.

[0065] Specifically, the activation material includes an activation component, and the activation component can react with the carotenoid to change color, thereby changing the color of the carotenoid from an initial first color to a second color.

[0066] In this embodiment, the activating component is a heavy metal ion, which can cause the carotenoid to undergo a discoloration reaction. During the discoloration reaction, the first color is usually orange-yellow, and the second color is usually colorless.

[0067] Preferably, the heavy metal ions are copper ions or iron ions.

[0068] Alternatively, the activating material containing copper ions or iron ions includes, but is not limited to, copper sulfate, copper nitrate, copper chloride, ferric hydroxide, ferric nitrate, ferric sulfate, ferric chloride, and ferric bromide.

[0069] It should be pointed out that when the carotenoid in the color-changing ink is gardenia yellow pigment, the activating material can also be gardenia glycoside and protease or B-glucosidase. Under the action of protease or B-glucosidase, gardenia glycoside can react with the primary amino compound in gardenia yellow pigment to form gardenia blue pigment. Therefore, the color of gardenia yellow pigment also gradually changes from the first color yellow to the second color green, and finally to the third color blue.

[0070] The second solvent is used to dilute the pressure-sensitive adhesive and dissolve the activated material so that the activated ink meets the printability requirements. The mass fraction of the second solvent is 15 to 40 parts.

[0071] In this embodiment, the second solvent is water.

[0072] In another embodiment, the activated ink further includes 0.01 to 0.5 parts of a desiccant. Adding a small amount of desiccant maintains a certain moisture content in the activated ink, which helps promote the dissociation of the activated material, ionizing the activated components and thereby increasing their migration rate. Therefore, the migration rate of the activated components can be controlled by controlling the amount of desiccant. When the activated ink is used to make time labels, the color change rate of the color-changing ink can be controlled by controlling the amount of desiccant.

[0073] Optionally, the desiccant material includes but is not limited to: calcium chloride, magnesium chloride, lithium chloride and glycerol.

[0074] After the activated ink is printed and dried, the activated ink layer has the characteristics of a pressure-sensitive adhesive. The activated component has a large migration rate in the form of a pressure-sensitive adhesive. When the activated component contacts the carotenoid through migration, the carotenoid can undergo a color gradient.

[0075] A timing label includes a color changing component 10 and an activation component 20. The color changing component 10 includes a color changing layer 11 and a first substrate layer 12 that are stacked together. The activation component 20 includes an activation layer 21 and a second substrate layer 22 that are stacked together.

[0076] exist Figure 1 、 Figure 2 The embodiment shown and Figure 3 、 Figure 4 In the embodiment shown, the color changing component 10 and the activation component 20 are stacked. Figure 5 、 Figure 6 The embodiment shown and Figure 7 、 Figure 8 In the illustrated embodiment, the color changing component 10 and the activation component 20 are arranged in a transverse connection.

[0077] Color-changing layer 11 is disposed on top of first substrate layer 12 and includes a color-changing region 111 printed with the color-changing ink provided by the first aspect of the present invention. Before activation, color-changing region 111 has a first color. Upon contact with activation layer 21, color-changing region 111 undergoes a gradual color change.

[0078] Preferably, the color-changing area 111 is arranged at the central position of the upper side of the first substrate layer 12, and an annular reference area 112 is arranged around the color-changing area 111. The reference area 112 is printed with ordinary ink. By setting the reference area 112, on the one hand, after the timing label is activated, the user can intuitively judge the current time process by comparing the colors of the color-changing area 111 and the reference area 112; on the other hand, the reference area 112 can cover the activation layer 21 located on the periphery of the color-changing area 111 in the vertical projection, which is conducive to improving the aesthetics of the timing label.

[0079] Optionally, the colors of the reference area 112 are the starting color, the middle color, and the end color of the color gradient process of the color changing area 111 .

[0080] The first substrate layer 12 is disposed below the color-changing layer 11 and is used to support the color-changing layer 11 . The first substrate layer 12 is made of a transparent film so that after the timing label is activated, the user can see the color of the color-changing layer 11 through the first substrate layer 12 .

[0081] Optionally, the material of the first substrate layer 12 includes but is not limited to: PVC film, PET film and PP film.

[0082] In another embodiment, see Figure 3 and Figure 4 The color-changing component 10 also includes a release layer 13, which is arranged on the side of the first substrate layer 12 away from the color-changing layer 11. By setting the release layer 13, the user can easily separate the color-changing component 10 from the top of the activation component 20 when activating the timing label.

[0083] The activation layer 21 is disposed on the upper side of the second substrate layer 22. The activation layer 21 contains an activation material. The activation component in the activation material can undergo a color change reaction with the carotenoid in the color change layer 11. The activation layer 21 is obtained by printing the activation ink provided by the second aspect of the present invention.

[0084] Preferably, the activation layer 21 is arranged at the center of the upper side of the second substrate layer 22, and the edge is hollowed out. This arrangement is conducive to the user peeling off the color-changing component 10 from the top of the activation component 20 during activation.

[0085] Preferably, the area of ​​the activation layer 21 is larger than that of the color-changing layer 11 , so that when the timing label is activated, the user does not need to precisely align the color-changing layer 11 and the activation layer 21 , which is conducive to improving the user experience.

[0086] The second substrate layer 22 is disposed on the lower side of the activation layer 21 and is used to support the activation layer 21. Optionally, the material of the second substrate layer 22 includes but is not limited to: paper, PVC film, PET film, PP film.

[0087] exist Figure 7 and Figure 8 In the illustrated embodiment, the activation component 20 further includes a protective layer 23 , which is disposed on a side of the activation layer 21 away from the second substrate layer 22 . The protective layer 23 prevents the activation layer 21 from adhering to other objects before the timing tag is activated.

[0088] exist Figure 1 、 Figure 2 The embodiment shown and Figure 3 、 Figure 4 In the embodiment shown, the color-changing component 10 is peeled off from above the activating component 20. After peeling, the color-changing component 10 is reversed and re-attached to the activating component 20, so that the color-changing layer 11 and the activating layer 21 are attached together, and the timing label is activated.

[0089] exist Figure 5 and Figure 6In the embodiment shown, the color-changing component 10 is folded to the right so that the color-changing layer 11 and the activation layer 21 are attached together, and the timing label is activated.

[0090] exist Figure 7 、 Figure 8 In the embodiment shown, after removing the protective layer 23, the color-changing component 10 is folded to the right so that the color-changing layer 11 and the activation layer 21 are attached together, and the timing label is activated.

[0091] Before activation, the above-mentioned timing label is in a dormant state because the color-changing region 111 is isolated from the activation layer 21 and the two are not in direct contact. After activation, the color-changing component 10 and the activation component 20 are attached together. At this time, the color-changing region 111 is in direct contact with the activation layer 21. The activating components in the activation layer 21 can migrate into the color-changing region 111 and react with the carotenoids in the color-changing region 111 to change color. As the activating components migrate, the color of the color-changing region 111 gradually changes from the initial first color to the second color. Therefore, the degree of color change can be used to indicate the progress of time.

[0092] The beneficial effect of the above-mentioned timing label: After the timing label is activated, since the color-changing area 111 and the activation layer 21 are in a sealed connection state, the color change rate of the color-changing area 111 depends on the migration rate of the activated components in the activation layer 21, and the migration rate of the activated components is independent of the ambient air flow rate. Therefore, compared with traditional timing labels, the timing accuracy of the above-mentioned timing label is greatly enhanced.

[0093] The following are specific examples.

[0094] The formula of the color-changing ink and the activated ink of Examples 1 to 4 is shown in the following table.

[0095] Table 1: Formulas of color-changing ink and activated ink in various embodiments

[0096]

[0097]

[0098] In Example 1, the binder used to prepare the color-changing ink was a water-based polyurethane resin, Model F0400, supplied by Shenzhen Jitian Chemical Co., Ltd.; the carotenoid was Zhongda Hengyuan β-carotene water-soluble powder, supplied by Henan Zhongda Hengyuan Biotechnology Co., Ltd.; and the first solvent was deionized water. The pressure-sensitive adhesive used to prepare the activated ink was a water-based acrylic emulsion, Model 0027, supplied by Yingchuang Technology (Guangdong) Co., Ltd.; the activating material was anhydrous copper sulfate, supplied by Henan Shengkun Chemical Products Co., Ltd.; and the second solvent was deionized water.

[0099] Example 1 also provides a timing tag, see Figure 1 and Figure 2 The timing label includes a color-changing component 10 and an activation component 20 arranged in a stacked manner. The color-changing component 10 includes a color-changing layer 11 and a first substrate layer 12 arranged in a stacked manner. The activation component 20 includes an activation layer 21 and a second substrate layer 22 arranged in a stacked manner. The color-changing layer 11 includes a color-changing area 111, and the color-changing area 111 is printed by the color-changing ink provided in Example 1. The activation layer 21 is printed by the activation ink provided in Example 1. The timing label provided in this embodiment has a timing period of approximately 30 days.

[0100] In Example 2, the connecting material used to prepare the color-changing ink is a water-based polyurethane resin with model ZW-8055, provided by Guangdong Zhongke Zhiyuan New Materials Technology Co., Ltd.; the carotenoid is gardenia yellow pigment, provided by Xi'an Zebang Biotechnology Co., Ltd.; the first solvent is deionized water; the pH regulator is sodium hydroxide; the pressure-sensitive adhesive used to prepare the activated ink is a water-based acrylic emulsion with model YK-253, provided by Shenzhen Yingkang Adhesive Products Co., Ltd.; the activating material is copper chloride; and the second solvent is deionized water.

[0101] Example 2 also provides a timing tag, see Figure 3 and Figure 4 The timing label includes a color-changing component 10 and an activating component 20, which are stacked. The color-changing component 10 includes a color-changing layer 11, a first substrate layer 12, and a release layer 13. The activating component 20 includes an activating layer 21 and a second substrate layer 22. The color-changing layer 11 includes a color-changing region 111 printed with the color-changing ink provided in Example 2. The activating layer 21 is printed with the activating ink provided in Example 2. The timing label provided in this example has a timing period of approximately 60 days.

[0102] In Example 3, the binder used to prepare the color-changing ink was a 9060 water-based polyurethane resin supplied by Huizhou Yuhao Chemical Co., Ltd.; the carotenoid was lutein, product number WF-01, supplied by Xi'an Wanfang Biotechnology Co., Ltd.; the first solvent was deionized water; the pH adjuster was potassium hydroxide; and the pigment stabilizer was disodium EDTA. The pressure-sensitive adhesive used to prepare the activated ink was a water-based acrylic emulsion supplied by Dongguan Mikai Waterproof Decorative New Materials Co., Ltd.; the activating material was ferric sulfate; and the second solvent was deionized water.

[0103] Example 3 also provides a timing tag, please refer to Figure 5 and Figure 6The timing label includes a color-changing component 10 and an activation component 20 arranged in a transverse connection. The color-changing component 10 includes a color-changing layer 11 and a first substrate layer 12, which are stacked together. The activation component 20 includes an activation layer 21 and a second substrate layer 22, which are stacked together. The color-changing layer 11 includes a color-changing region 111, which is printed with the color-changing ink provided in Example 3. The activation layer 21 is printed with the activation ink provided in Example 3. The timing label provided in this example has a timing period of approximately 90 days.

[0104] In Example 4, the binder used to prepare the color-changing ink was a water-based polyurethane resin, Model 9060, provided by Huizhou Yuhao Chemical Co., Ltd.; the carotenoid was lutein, Product No. WF-01, provided by Xi'an Wanfang Biotechnology Co., Ltd.; the first solvent was deionized water; the pH regulator was potassium hydroxide; and the pigment stabilizer was disodium EDTA. The pressure-sensitive adhesive used to prepare the activated ink was a water-based acrylic emulsion, provided by Dongguan Mikai Waterproof Decoration New Materials Co., Ltd.; the activating material was ferric sulfate; the second solvent was deionized water; and the hygroscopic agent was calcium chloride.

[0105] Example 4 also provides a timing tag, please refer to Figure 7 and Figure 8 The timing label includes a color-changing component 10 and an activating component 20, which are arranged in a transverse connection. The color-changing component 10 includes a color-changing layer 11 and a first substrate layer 12, which are stacked together. The activating component 20 includes a protective layer 23, an activating layer 21, and a second substrate layer 22, which are stacked together. The color-changing layer 11 includes a color-changing region 111, which is printed with the color-changing ink provided in Example 4. The activating layer 21 is printed with the activating ink provided in Example 4. The timing label provided in this example has a timing period of approximately 80 days.

[0106] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A timing tag, characterized in that: include: The color-changing component includes a color-changing layer and a first substrate layer stacked together. The color-changing layer includes a color-changing region, and the color-changing region is printed with a color-changing ink. The raw materials for preparing the color-changing ink include the following components, measured by mass: 15 to 45 parts of connecting material; 5~20 parts of carotenoids; 20 to 50 parts of the first solvent; as well as The activation assembly includes a stacked activation layer and a second substrate layer. The activation layer is printed with activation ink. The raw materials for preparing the activation ink include the following components, measured by mass: 35 to 60 parts of pressure-sensitive adhesive; 1 to 10 parts of activation material; as well as 15 to 40 parts of the second solvent; The activation material comprises an activation component, which is a heavy metal ion, and the heavy metal ion is an iron ion or a copper ion. The activation component can react with the carotenoid to produce a color reaction.

2. The timing tag according to claim 1, characterized in that: The color-changing ink further includes 0.5 to 2 parts of a pH regulator, measured in parts by mass.

3. The timing tag according to claim 2, characterized in that: The carotenoids include: carotene, xanthophylls, esters of xanthophylls and carotene acid.

4. The timing tag according to claim 1, wherein: The activated ink further comprises 0.01 to 0.5 parts of a moisture absorbent, measured in parts by mass.

5. The timing tag according to claim 4, characterized in that: The desiccant is selected from any one of calcium chloride, magnesium chloride, lithium chloride and glycerol.

6. The timing tag according to any one of claims 1 to 5, characterized in that: The color-changing component and the activation component are stacked or laterally connected.

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