A timepiece label

Abstract

This invention discloses a timing tag, comprising a base layer and an indicator layer stacked together. The indicator layer has an indicator area, which is obtained by printing and drying timing ink. The timing ink comprises: 25-50 parts of binder, 30-60 parts of organic solvent, and 5-25 parts of biodegradable polymer material, wherein the particle size of the biodegradable polymer material is 0.1 micrometers to 10 micrometers. In the above-mentioned timing tag, the biodegradable polymer material particles are embedded in the ink film layer, and the ink presents a first color. At this time, water molecules can enter the ink film layer through the micropores formed by the evaporation of organic solvent and come into contact with the biodegradable polymer material particles, causing the biodegradable polymer material to undergo slow hydrolysis, degrading the biodegradable polymer material from a polymer to an oligomer. As the biodegradable polymer material particles degrade, their physical form changes from granules with the first color to powder with a second color. Therefore, the color change of the timing ink can be used to indicate the progress of time.

Description

Technical Field

[0001] This invention relates to the field of label technology, and more particularly to a timing label. Background Technology

[0002] Existing timing tags are typically printed with timing ink containing volatile pigments or dyes. When activated, the ink changes color gradually as the pigments or dyes evaporate, indicating the passage of time. However, this timing ink has two problems: first, the evaporation of volatile pigments or dyes can contaminate the product, posing a safety risk; second, the evaporation rate of volatile pigments or dyes is temperature-dependent, and changes in ambient temperature directly affect the evaporation rate, resulting in poor timing accuracy.

[0003] Therefore, it is necessary to provide a timing tag that is pollution-free and has high timing accuracy. Summary of the Invention

[0004] This invention provides a timing tag to solve the above-mentioned problems.

[0005] A timing tag includes a base layer and an indicator layer stacked together. The indicator layer has an indicator area, which is obtained by printing and drying timing ink. The timing ink includes 25 to 50 parts of binder, 30 to 60 parts of organic solvent, and 5 to 25 parts of biodegradable polymer material, wherein the particle size of the biodegradable polymer material is 0.1 micrometer to 10 micrometer.

[0006] In one embodiment, a removable isolation layer is further included, the isolation layer being disposed on the side of the indicator layer away from the base layer, the edge of the isolation layer being sealed to the base layer.

[0007] In one embodiment, the timing ink further includes 0.1 to 1 part water.

[0008] In one embodiment, the biodegradable polymer material is selected from at least one of polylactic acid, polylactic acid-glycolic acid copolymer, polyglycolic acid, polycaprolactone, and polyethylene glycol.

[0009] In one embodiment, the binder is selected from at least one of polyvinyl butyral, polyester acrylate resin, acrylate resin, and polyamide resin.

[0010] In one embodiment, the binder is selected from at least one of polyvinyl butyral, polyester acrylate resin, acrylate resin, and polyamide resin.

[0011] In one embodiment, it also includes 0.5 to 3 parts of hydrophilic material.

[0012] In one embodiment, the hydrophilic material is selected from at least one of glycerol, calcium sulfate, magnesium chloride, calcium chloride, lithium chloride, lithium bromide, potassium sorbate, and xylitol.

[0013] In one embodiment, the indicator layer is further provided with a reference area, which is disposed around the indicator area.

[0014] In one embodiment, the reference area includes three colors: a starting color, a middle color, and an ending color.

[0015] The aforementioned timing label includes an indicator area in its indicator layer, which is formed by printing and drying timing ink. After the timing ink dries, biodegradable polymer particles are embedded within the ink film, and the ink exhibits a first color. At this time, water molecules can enter the ink film through the micropores formed by the evaporation of organic solvents and come into contact with the biodegradable polymer particles, causing the biodegradable polymer to undergo slow hydrolysis, degrading it from a polymer into an oligomer. As the biodegradable polymer particles degrade, their physical form changes from granules with the first color to powder with a second color. Therefore, the color change of the timing ink can be used to indicate the progress of time.

[0016] The beneficial effects of the above timing tags include: (1) the degradation products of the biodegradable polymer are oligomers that constitute the polymer, which are pollution-free; (2) the hydrolysis rate of the polymer is less affected by temperature, and the timing tag indicates high accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a timing tag structure according to one embodiment;

[0018] Figure 2 A schematic diagram of a timing tag structure for another implementation method;

[0019] Figure 3 A schematic diagram of a timing tag structure for another implementation method;

[0020] Figure 4 For example Figure 3 The top view of the timing label shown. Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is considered to be "connected" or "connected" to another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0023] The timing tag will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please see Figure 1 An anti-counterfeiting label according to one embodiment includes a base layer 10 and an indicator layer 20 stacked together. The indicator layer 20 is provided with an indicator area 21, which is obtained by printing and drying with timing ink. The timing ink includes: 25 to 50 parts of binder, 30 to 60 parts of organic solvent, and 5 to 25 parts of biodegradable polymer material, wherein the particle size of the biodegradable polymer material is 0.1 micrometer to 10 micrometer.

[0025] Specifically, the base layer 10 is used to support the indicator layer 20. The base layer 10 is made of a dense material to prevent water molecules from passing through the base layer 10 and entering the indicator layer 20.

[0026] Optionally, the materials used to prepare the substrate layer 10 include, but are not limited to: PVC film, PET film, PP film and metallized film.

[0027] Indicator layer 20 is stacked on base layer 10. Indicator layer 20 includes indicator area 21, which is used to indicate time progress.

[0028] Specifically, the indicator area 21 is printed and dried with timing ink. By mass, the timing ink includes: 25 to 50 parts of binder, 30 to 60 parts of organic solvent, and 5 to 25 parts of biodegradable polymer material, wherein the particle size of the biodegradable polymer material is 0.1 micrometer to 10 micrometer.

[0029] The binder, by weight, is used in amounts of 25 to 50 parts. The binder is soluble in organic solvents, and after the ink dries, the binder forms a transparent film.

[0030] Optionally, the binder is selected from at least one of polyvinyl butyral, polyester acrylate resin, acrylate resin, and polyamide resin.

[0031] The organic solvent, by mass, is used in an amount of 30 to 60 parts. On the one hand, the organic solvent is used to dissolve the binder, so that the timing ink is in a colloidal state, thus meeting the requirements of printability. On the other hand, during the evaporation process, the organic solvent can form micropores in the timing ink film that are connected to the outside world, allowing water molecules in the air to enter the ink layer through the micropores.

[0032] In addition, organic solvents are immiscible with biodegradable polymers, thus allowing the biodegradable polymers to maintain the integrity of the particles.

[0033] Optionally, the organic solvent includes, but is not limited to, at least one of ethanol, isopropanol, butanol, pentanol, cyclohexanol, acetone, and cyclohexanone.

[0034] In another embodiment, the timing ink also includes 0.1 to 1 part water. Surprisingly, when 0.1 to 1 part water is added to the timing ink, the molecular chains of the biodegradable polymer are in a slightly relaxed state before printing. This water can completely dry during the printing process. During drying, the biodegradable polymer particles shrink in volume, creating narrow pores between the particles and the film formed by the binder. These pores facilitate sufficient contact between water molecules and the biodegradable polymer particles, resulting in more even degradation and improved timing accuracy. It is understood that to suppress the degradation of the biodegradable polymer by water before printing, this can be achieved by limiting the time of water addition to the timing ink, for example, adding this portion of water to the timing ink within one hour before printing.

[0035] The biodegradable polymer material, used in amounts ranging from 5 to 25 parts by mass, is insoluble in organic solvents and has a particle size of 0.1 to 10 micrometers. By limiting the particle size of the biodegradable polymer material, the timing ink meets printability requirements. Furthermore, the biodegradable polymer material can be degraded from a polymer to an oligomer through hydrolysis by water molecules.

[0036] Preferably, the biodegradable polymer material has a smooth surface. When the biodegradable polymer material has a smooth surface, the timing ink has a certain degree of transparency after curing. When the biodegradable polymer material degrades, the timing ink changes from transparent to opaque, thereby enhancing the color-changing effect of the timing ink. This color-changing effect is particularly pronounced when the biodegradable polymer material itself is transparent. Specifically, the smooth surface can be obtained by melting and then re-solidifying the biodegradable polymer material particles with hot air.

[0037] Specifically, biodegradable polymers can be polymerized from oligomers, forming ester bonds during the polymerization process. These bonds have a long chain structure at the microscopic level, with atoms on the chain connected by covalent bonds. During crystallization, the chain segments cannot move freely enough. Therefore, this structure hinders their regular stacking and arrangement, resulting in a large number of lattice defects inside the polymer crystal. Based on the number of lattice defects, the biodegradable polymer can be divided into two parts: an amorphous region and a crystalline region.

[0038] Biodegradable polymers can degrade under the influence of water molecules. This degradation process is a continuous erosion process: First, water molecules penetrate into the biodegradable polymer, causing the polymer molecular chains to relax. Second, the ester bonds in the biodegradable polymer undergo hydrolysis and breakage under the influence of water. Subsequently, the amorphous and crystalline regions of the molecular chains undergo hydrolysis and breakage in succession under the influence of water, causing the biodegradable polymer to degrade from a high polymer to an oligomer. At the same time, its physical form changes from granular to powder, thereby causing the color of the timing ink to gradually change from the first color to the second color.

[0039] Optionally, the biodegradable polymer material is selected from at least one of polylactic acid (PLA), polylactic acid-glycolic acid copolymer (PLGA), polyglycolic acid (PGA), polycaprolactone, and polyethylene glycol.

[0040] Polyglycolic acid (PGA), also known as polyglycolic acid or polyglycolic acid, is initially yellowish-brown in color. It is polymerized from glycolic acid and exhibits strong hydrophilicity and a rapid hydrolysis rate. Specifically, when its molecular weight is 10,000, the complete degradation time of its particles under the influence of water molecules is approximately 7 days; when its molecular weight is 15,000, the complete degradation time is approximately 20 days; and when its molecular weight is 20,000, the complete degradation time is approximately 60 days. It is evident that the degradation time of PGA is positively correlated with its molecular weight. Therefore, the timing cycle of timing inks can be controlled by adjusting the molecular weight of PGA. Furthermore, due to its rapid hydrolysis rate, PGA is suitable for preparing short-cycle timing inks. After hydrolysis, the polymer of PGA yields oligomers of glycolic acid, whose color gradually changes from yellowish-brown to white during the hydrolysis process.

[0041] Polylactic acid (PLA) can be polymerized from lactide. Its initial color is transparent and it has high weather resistance. The complete degradation time of its particles under the action of water molecules is usually about 2 years, making it suitable for preparing long-cycle timing inks. During the hydrolysis process, its color gradually changes from transparent to white.

[0042] Polylactic acid-glycolic acid copolymer (PLGA) is initially transparent and can be polymerized from lactide and glycolide. The higher the proportion of glycolide, the shorter the degradation time, and vice versa. Therefore, the degradation time of polylactic acid-glycolic acid copolymer (PLGA) can be controlled by adjusting the ratio of lactide to glycolide. During the hydrolysis process, its color gradually changes from transparent to white.

[0043] Furthermore, biodegradable polymers possess terminal carboxyl groups, which can act as autocatalysts during the hydrolysis process. As the polymer degrades, the number of molecular chains increases, and the number of terminal carboxyl groups also increases rapidly. Under the autocatalytic effect of the terminal hydroxyl groups, the degradation rate will further accelerate. Therefore, the overall degradation rate of biodegradable polymers exhibits a slow initial rate followed by a rapid rate later. Correspondingly, the color change rate of timing ink also exhibits a slow initial rate followed by a rapid rate later. Therefore, as the timing deadline approaches, the psychological cue effect of the timing ink on the user that "the deadline is approaching" will be significantly stronger.

[0044] Optionally, the biodegradable polymeric material having a terminal carboxyl group includes polyglycolic acid, polylactic acid, and polylactic acid-glycolic acid copolymer.

[0045] In another embodiment, the timing ink also includes 0.5 to 3 parts of hydrophilic material, which can adsorb water molecules from the air, so that after the timing ink dries into a film, the ink layer maintains a high humidity, thereby promoting the degradation of the biodegradable polymer material.

[0046] Preferably, the mass fraction of the hydrophilic material is 2 to 2.5 parts. By limiting the mass fraction of the hydrophilic material, the ink layer can maintain a humidity of about 40% to 50% after the ink dries by absorbing moisture from the air. On the one hand, this ensures that the ink layer maintains sufficient humidity to allow the biodegradable polymer material to undergo continuous hydrolysis. On the other hand, it prevents the adhesion of the ink layer from being affected by excessive water content.

[0047] Optionally, the hydrophilic material is selected from at least one of glycerol, calcium sulfate, magnesium chloride, calcium chloride, lithium chloride, lithium bromide, potassium sorbate, and xylitol.

[0048] Preferably, the hydrophilic material includes at least one of potassium sorbate or xylitol. In addition to being hydrophilic, potassium sorbate and xylitol also have the functions of antiseptic and inhibiting microbial growth, which can prevent the growth of microorganisms in the ink layer. Since microorganisms can biodegrade degradable polymer materials under the action of enzymes, and since the rate of biodegradation is greatly affected by environmental factors such as temperature, light, and humidity, its degradation rate is extremely unstable. Therefore, by inhibiting biodegradation, the degradable polymer materials are hydrolyzed only under the action of water molecules, which is beneficial to significantly improve the timing accuracy of the timing ink.

[0049] In another embodiment, the timing ink also includes 0.1 to 1 part of defoamer. By adding defoamer to the timing ink, bubbles can be prevented from forming in the ink system, thereby improving the printability of the timing ink.

[0050] Optionally, the defoamer is selected from any one of non-silicone defoamers, polyether defoamers, silicone defoamers, and polyether-modified silicone defoamers.

[0051] In another embodiment, the timing ink further includes 0.5 to 1 part of a dispersant, which is used to prevent the sedimentation and aggregation of degradable polymer particles, thereby enabling the timing ink to form a stable suspension colloid.

[0052] Optionally, the dispersant is selected from sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, alkyl aryl phosphate, alkylbenzene sulfonate, dialkyl sulfosuccinate, etc.

[0053] In another embodiment, the timing ink also includes 0.5 to 1 part of a leveling agent, which can give the timing ink better leveling properties, thereby improving the printability of the timing ink.

[0054] Optionally, the leveling agent is selected from at least one of silicone oil, polydimethylsiloxane, polyether polyester modified organosiloxane, and alkyl modified organosiloxane.

[0055] In another embodiment, the timing ink also includes 0.1 to 0.5 parts of a pH adjuster, which is used to adjust the pH value of the ink film. Experiments have shown that the degradation rate of biodegradable polymers is the highest under alkaline conditions, followed by the degradation rate under acidic conditions, and the lowest under neutral conditions.

[0056] It should be understood that any material that can change the pH value of ink can be used as a pH adjuster in this invention.

[0057] In another implementation, please refer to Figure 3 and Figure 4 The indicator layer 20 also includes a reference area 22, which surrounds the indicator area 21. The reference area 22 is printed with ordinary ink and is used to indicate the current time progress of the indicator area 21.

[0058] Specifically, the reference area 22 includes three colors: a starting color, a middle color, and an ending color. The starting color corresponds to the initial color of the indicator area 21, the middle color corresponds to the middle point color of the indicator area 21, and the ending color corresponds to the ending color of the indicator area 21. By comparing the colors of the indicator area 21 and the reference area 22, the user can determine the current time progress.

[0059] In another implementation, please refer to Figure 2 and Figure 3 The timing tag is also equipped with an isolation layer 30, which is used to prevent water molecules from contacting the indicator area 21, thereby keeping the timing tag in a dormant state.

[0060] Specifically, the isolation layer 30 is stacked on the side of the indicator layer 20 away from the base layer 10. It is made of a dense material that prevents water molecules from passing through, and its edges are sealed to the base layer 10. A removable adhesive layer (not shown in the figure) is provided on the side of the isolation layer 30 near the indicator layer 20. The user can easily peel off the isolation layer 30 to allow the indicator layer 20 to communicate with the outside world, thereby activating the timing tag.

[0061] Optionally, the materials used to prepare the isolation layer 30 include, but are not limited to, any one of PET film, PVC film, PP film and metallized film.

[0062] In another embodiment, an adhesive layer (not shown) is provided on the side of the base layer 10 away from the indicator layer 20. The adhesive layer is used to adhere the time tag to the product or product packaging, thereby indicating the product's life cycle.

[0063] Preferably, a release layer (not shown in the figure) is also provided on the side of the adhesive layer away from the base layer 10. The release layer is used to protect the adhesive layer, thereby preventing the timing tag from sticking to the item before use.

[0064] The aforementioned timing label includes an indicator layer 20 comprising an indicator area 21, which is formed by printing and drying timing ink. After the timing ink dries, biodegradable polymer particles are embedded within the ink film, and the ink exhibits a first color. At this time, water molecules can enter the ink film through the micropores formed by the evaporation of organic solvents and come into contact with the biodegradable polymer particles, causing the biodegradable polymer to undergo slow hydrolysis, degrading it from a polymer into an oligomer. As the biodegradable polymer particles degrade, their physical form changes from granules with the first color to powder with a second color. Therefore, the color change of the timing ink can be used to indicate the progress of time.

[0065] The beneficial effects of the above timing tags include: (1) the degradation products of the biodegradable polymer are oligomers that constitute the polymer, which are pollution-free; (2) the hydrolysis rate of the polymer is less affected by temperature, and the timing tag indicates high accuracy.

[0066] The following are specific examples. Example

[0067] Please see Figure 1This embodiment provides a timing tag, which includes a base layer 10 and an indicator layer 20. The indicator layer 20 includes an indicator area 21, which is printed and dried by timing ink. In this embodiment, the raw materials for preparing the timing ink include, by weight, 25 parts of the binder polyvinyl butyral, provided by Guangzhou Xuri New Material Technology Co., Ltd.; 30 parts of the organic solvent isopropanol, provided by Shandong Tongxin Chemical Co., Ltd.; and 5 parts of the biodegradable polymer material, which is polyglycolic acid with a molecular weight of 10,000, obtained by grinding polyglycolic acid of model PGA-03 provided by Shandong Zengyi Biotechnology Co., Ltd.

[0068] The aforementioned timing label, with indicator area 21, is printed and dried using timing ink. After the timing ink dries, biodegradable polymer particles are embedded within the ink film, giving the ink a first color of yellowish-brown. At this point, water molecules can enter the ink film through the micropores formed by the evaporation of organic solvents and come into contact with the biodegradable polymer particles, causing the biodegradable polymer to undergo slow hydrolysis, degrading it from a polymer into an oligomer. As the biodegradable polymer particles degrade, their physical form changes from granular with the first color of yellowish-brown to a powder with the second color of white. The timing period is 7 days.

[0069] The beneficial effects of the above timing labels include: (1) the degradation products of the biodegradable polymer material are oligomers that constitute the polymer material, which are pollution-free; (2) the hydrolysis rate of the polymer material is less affected by temperature, and the timing ink has high accuracy. Example

[0070] Please see Figure 2 The timing tag provided in this embodiment is similar to the timing tag provided in embodiment 1, except that: (1) the timing tag also includes 30 layers of isolation layer; (2) the biodegradable polymer material is polyglycolic acid with a molecular weight of 15,000, which is obtained by grinding polyglycolic acid with model PGA-05 provided by Shandong Zengyi Biotechnology Co., Ltd.

[0071] Once activated, the aforementioned timing tag has a timing period of 20 days. Example

[0072] The timing tag provided in this embodiment is similar to the timing tag provided in Embodiment 2, except that the biodegradable polymer material is polyglycolic acid with a molecular weight of 20,000, which is obtained by grinding polyglycolic acid of model PGA-08 provided by Shandong Zengyi Biotechnology Co., Ltd.

[0073] Once activated, the aforementioned timing tag has a timing period of 60 days. Example

[0074] Please see Figure 3 and Figure 4 This embodiment provides a timing tag, which includes a base layer 10, an indicator layer 20 and an isolation layer 30. The indicator layer 20 includes an indicator area 21, which is printed and dried by timing ink. In this embodiment, the raw materials for preparing the timing ink by weight include: (1) 37.5 parts of the binder polyester acrylic resin, provided by Guangzhou Changhao Trading Co., Ltd., model SGR-2600; (2) 45 parts of the organic solvent anhydrous ethanol, provided by Guangzhou Dongzhen Chemical Technology Co., Ltd., model A-106; (3) 15 parts of the biodegradable polymer material, which is polylactic acid-glycolic acid copolymer, and the ratio of lactide to glycolide is 50:50, which is obtained by grinding polylactic acid-glycolic acid copolymer model PLG50-07 provided by Wuhan Kemike Biomedical Technology Co., Ltd.; (4) 0.5 parts of the hydrophilic material glycerol, provided by Guangzhou Kaixin New Material Technology Co., Ltd.

[0075] Once activated, the aforementioned timing tag has a timing period of 130 days. Example

[0076] The timing tag provided in this embodiment is similar to the timing tag provided in Example 1, except that: (1) the biodegradable polymer material is polylactic acid-glycolic acid copolymer, and the ratio of lactide to glycolide is 75:25. It is obtained by grinding polylactic acid-glycolic acid copolymer of model PLG75-04 provided by Wuhan Kemike Biomedical Technology Co., Ltd.; (2) the hydrophilic material is potassium sorbate, with a mass fraction of 1.5 parts, provided by Henan Basil Food Additives Co., Ltd.

[0077] The aforementioned timing tag, once activated, has a timing period of 280 days. Potassium sorbate, a hydrophilic material, not only possesses hydrophilic properties but also acts as an antiseptic and inhibits microbial growth. This prevents the growth of microorganisms within the ink layer. Since microorganisms can biodegrade biodegrade polymers under the action of enzymes, and the rate of biodegradation is highly unstable due to significant influences from environmental factors such as temperature, light, and humidity, inhibiting biodegradation ensures that the biodegradable polymers undergo hydrolysis only under the influence of water molecules, significantly improving the timing accuracy of the timing ink. Example

[0078] Please see Figure 3 and Figure 4This embodiment provides a timing label, which includes a base layer 10, an indicator layer 20 and an isolation layer 30. The indicator layer 20 includes an indicator area 21, which is printed and dried by timing ink. In this embodiment, the raw materials for preparing the timing ink by weight include: (1) 50 parts of the binder polyamide resin, provided by Shandong Changyao New Material Co., Ltd., model CY-F1; (2) 60 parts of the organic solvent cyclohexanol, provided by Xi'an Tianmao Chemical Co., Ltd.; (3) 25 parts of the biodegradable polymer polylactic acid, provided by Suzhou Lvbo Degradable Materials Co., Ltd., model LB-NR210; (4) 3 parts of the hydrophilic material xylitol, provided by Guangzhou Huiding Food Co., Ltd.; (5) 0.5 parts of water were added to the timing ink 1 hour before printing.

[0079] The aforementioned timing label, once activated, has a timing period of 720 days. Furthermore, by adding 0.5 parts water to the timing ink before printing, the molecular chains of the biodegradable polymer material are in a slightly relaxed state before printing. This water can completely dry during the printing process. During drying, the biodegradable polymer particles shrink in volume, creating narrow pores between the particles and the film formed by the binder. These pores facilitate sufficient contact between water molecules and the biodegradable polymer particles, resulting in more even degradation of the particles and thus improving the timing accuracy of the timing ink.

[0080] The formulations of the timing inks and the corresponding timing cycles in the timing labels of Examples 1-6 are shown in Table 1 below.

[0081] Table 1. Timing ink formulations and timing cycles for each embodiment.

[0082]

[0083] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A time label, characterized in that The time indicator comprises a base layer and an indicating layer arranged in a stack, the indicating layer is provided with an indicating area, the indicating area is obtained by printing and drying a time ink, the time ink comprises 25-50 parts of a binder, 30-60 parts of an organic solvent, and 5-25 parts of a degradable polymer material, the degradable polymer material has terminal carboxyl groups which play a self-catalytic role in the hydrolysis of the degradable polymer material, wherein the particle size of the degradable polymer material is 0.1-10 microns.

2. The time label of claim 1, wherein, The time indicator further comprises a removable isolation layer arranged on the side of the indicating layer away from the base layer, the edge of the isolation layer is sealingly connected with the base layer.

3. The time label of claim 1 wherein, The time ink further comprises 0.1-1 parts of water.

4. The time label of claim 3, wherein, The degradable polymer material is selected from at least one of polylactic acid, polylactic acid-glycolic acid copolymer, polyglycolic acid, polycaprolactone, and polyethylene glycol.

5. The time label of claim 4 wherein, The binder is selected from at least one of polyvinyl butyral, polyester acrylic resin, acrylate resin, and polyamide resin.

6. The time label of claim 5, wherein, The binder is selected from at least one of polyvinyl butyral, polyester acrylic resin, acrylate resin, and polyamide resin.

7. The time label of claim 6 wherein, The time indicator further comprises 0.5-3 parts of a hydrophilic material.

8. The time label of claim 7, wherein, The hydrophilic material is selected from at least one of glycerol, calcium sulfate, magnesium chloride, calcium chloride, lithium chloride, lithium bromide, potassium sorbate, and xylitol.

9. The time-tagging label of claim 1, wherein, The indicating layer is further provided with a reference area, the reference area is arranged around the indicating area.

10. The time label of claim 9, wherein, The reference area comprises three colors of a start color, an intermediate color, and an end color.

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