Color-changing indication label and preparation method and application thereof

Abstract

The invention discloses a color-changing indication label and a preparation method and application thereof, and the preparation method comprises the following steps: coating a substrate with a solution containing a composite dye, and removing a solvent in the solution to obtain the color-changing indication label, at least one dye in the composite dye in the indication area in the color change indication label is decolored or discolored after being treated, and after the dye is overlapped with other dyes in the composite dye, the composite dye presents different color systems before and after being treated. The color management is carried out on the dye by utilizing the phenomenon that the dye is decolored or discolored after being treated, and a composite dye system is used as a discoloring material of the indication label, so that the color difference of the indication label before and after being treated is enhanced. Therefore, the label can be used as a color-changing indicator, is applied to various operation processes, and is particularly used as an important tool for fool-proof treatment, so that operation errors are effectively avoided, and the working efficiency and accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of color-changing indicator labels, and in particular to a color-changing indicator label and a preparation method and application thereof. Background Art

[0002] Dyes will fade or change color after being treated with plasma, gamma rays or ultraviolet radiation. This color change characteristic has been widely recognized by scientists and engineers. However, these dyes cannot be directly used as color-changing materials for color-changing indicator labels. This is because the colors of the dyes before and after the color change or fading are relatively close. In actual working conditions, due to differences in light and other factors, it is difficult for the human eye to effectively identify this subtle difference.

[0003] In order to solve the above problems, the prior art adds unstable polymers under the irradiation of high-energy particles such as plasma treatment or Gamma rays (γ rays), ultraviolet radiation, etc. as fillers or coverings in dyes, or changes the physical and chemical properties of dyes by doping nanoparticles, and introduces photosensitizers to enhance the sensitivity of dyes to plasma treatment or Gamma rays (γ rays), ultraviolet radiation, etc. These methods can induce significant changes in energy band structure, chemical composition, crystal structure or surface roughness of modified dyes before and after plasma treatment or Gamma rays (γ rays), ultraviolet radiation treatment, thereby obtaining color-changing materials with obvious color differences, meeting the production requirements of color-changing indicator labels.

[0004] Sakura Corporation of Japan has developed a color-changing indicator label with an ink formula containing colorants, nanofillers and polymers. This technology uses plasma and ultraviolet light irradiation to eliminate the surface material of the color-changing area, or change its surface roughness, thereby causing the color of the label to change. However, the formulation and preparation process of this technology are relatively demanding, the temperature and light resistance of the color-changing material are poor, and polymer fragments may be generated during the plasma and ultraviolet light elimination process, which may pollute the monitored cavity environment.

[0005] Moreover, the color-changing labels of the prior art need to be stored under low temperature conditions, which not only increases the storage cost, but also severely limits its flexibility of use under various environmental conditions. In addition, the cumbersome operation and potential risk of color change during transportation further increase the inconvenience of its wide application. In addition, these color-changing indicator labels also have the problem of easy color change when exposed to light, that is, the color of the label is easy to change under light conditions. This uncontrolled color change phenomenon may lead to deviation or misjudgment of the monitoring results, thereby affecting the accuracy and reliability of the detection. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a color-changing indicator label and its preparation method and application, which utilizes the discoloration or discoloration phenomenon of the dye after treatment to manage its color, uses a composite dye system as the color-changing material of the indicator label, and significantly enhances the color difference of the indicator label before and after treatment by superimposing the colors of different dyes. This enables the label to be used as a color-changing indicator in various operation processes, especially as an important tool for fool-proofing, effectively avoiding operation errors and improving work efficiency and accuracy.

[0007] The present invention is achieved through the following technical solutions:

[0008] The present invention provides a method for preparing a color-changing indicator label, comprising the following steps:

[0009] A method for preparing a color-changing indicator label comprises the following steps: coating a solution containing a composite dye on a substrate, and removing the solvent in the solution to obtain the color-changing indicator label;

[0010] At least one dye in the composite dye in the indication area of ​​the color-changing indication label is decolorized or changed color after treatment, and after being superimposed with other dyes in the composite dye, the composite dye presents different colors before and after treatment.

[0011] This color change exceeds the human eye's perception threshold for a single color change, making it feel like a significant color change. Therefore, it can be used as an indicator label for foolproof processing.

[0012] The present invention proposes to perform color management on dyes that have been decolorized or changed after treatment, that is, to superimpose or mix dyes that have been decolorized or changed after treatment with other dyes with non-similar colors, thereby obtaining a composite dye. Using this technology, the composite dye is coated on a specific substrate, and when the colorants are superimposed, it can absorb several monochromatic wavelengths in the incident light. In addition, it further cooperates with the roughness of the substrate surface, and each component of the dye and the substrate surface selectively absorb (subtract) a specific wavelength in the incident light, thereby reflecting the remaining color light, and finally achieving a color presentation effect that is significantly different from the original dye. After treatment with plasma, ultraviolet light irradiation, gamma ray irradiation, etc., the color of a single dye changes slightly. In the color obtained by superposition, the above-mentioned synergistic factors cause the spectral components after superposition to change, and then the slight color change in the single dye before and after treatment can be reflected as a larger color change in the composite dye. In addition, since the transparency or concentration of the single dye is reduced after treatment, it also contributes to the larger change in the final color after superposition. Therefore, using the composite dye system as the color-changing material of the indicator label, the composite dye presents an obvious color change before and after treatment.

[0013] In summary, after the color-changing indicator label prepared by the present invention is treated, each component in the composite dye will show different color change characteristics. The superposition combination of these color changes, as well as the synergistic effect with the roughness of the substrate, can significantly improve the color difference before and after treatment. Specifically, a single dye only undergoes slight color change or fading after treatment, showing a similar color to the original dye, and the present invention can enhance it to a non-similar color, thereby achieving the purpose of convenient identification by the human eye and achieving the goal of plasma indication.

[0014] Further, the dye that decolorizes or changes color after treatment is selected from one or more of methyl violet, direct violet, acid blue 9, solvent blue 5, m-cresol violet, thymol blue (thymol blue), alizarin yellow R, bromophenol blue, Congo red, turmeric, neutral red, bromocresol green, phenol red, p-nitrophenol, alizarin red, methyl red, phenol red, methyl blue, methylene blue, rhodamine-6G, rhodamine-B, brilliant blue-R, brilliant blue-G, peacock blue, acridine orange, bromocresol green and direct red 80.

[0015] Furthermore, the color of the dye that is decolorized or changed after treatment in the composite dye is not similar to the color of other dyes before treatment.

[0016] Furthermore, the composite dye is easily soluble or soluble in a solvent to obtain the solution containing the composite dye.

[0017] Furthermore, the solvent is selected from one or more of water, methanol, ethanol, acetone and chloroform.

[0018] Furthermore, the roughness of the substrate is 0-2.5 μm.

[0019] Furthermore, the coating method is selected from one or more of spray coating, dip coating, drip coating, brush coating, slit coating and spin coating.

[0020] In a specific embodiment, the solution containing the composite dye can be coated on the substrate at one time, or solutions of different dyes can be coated on the substrate in sequence.

[0021] In a specific embodiment, the concentration of the single dye in the solution containing the single dye is 0.1-2 wt %.

[0022] In a specific embodiment, two different single dye solutions are mixed to obtain a solution containing a composite dye, wherein the volume ratio of the two different single dye solutions is (5-20):1.

[0023] Furthermore, after removing the solvent from the solution, the method further includes performing aging treatment steps such as heating and humidification.

[0024] Furthermore, the treatment method is plasma treatment, Gamma ray (γ ray) irradiation treatment or ultraviolet irradiation treatment.

[0025] Furthermore, the conditions of the plasma treatment are: power of 100-1000W, and treatment time of 0.5-1000s.

[0026] The present invention protects the color-changing indicator label prepared by the above method.

[0027] The present invention also protects the use of the above-mentioned color change indicator label in the detection of plasma treatment, Gamma ray (γ ray) irradiation treatment and ultraviolet irradiation treatment.

[0028] Beneficial effects of the present invention:

[0029] 1. The present invention is extremely flexible in selecting the formula of the composite dye. By combining the fine adjustment of the surface roughness of the substrate, the color change effect of the color-changing indicator label can be conveniently adjusted, thereby enriching the color selection of the label and meeting more diverse visual needs.

[0030] 2. When the color-changing indicator label of the present invention is used for plasma treatment detection, the color-changing indicator label can change color under different plasma atmospheres (such as air, ozone, oxygen, nitrogen, argon, etc.), showing excellent indication function.

[0031] 3. The color-changing indicator label provided by the present invention can be stored for a long time at room temperature and has good thermal stability.

[0032] 4. The color-changing indicator label provided by the present invention does not require adhesives, micro-nano fillers, photopolymerization initiators, various photosensitive reagents, surfactants and other additives. When used for plasma treatment detection, it avoids the generation of decomposition residues and does not cause solid pollution to the operating cavity.

[0033] 5. The method for preparing the color-changing indicator label provided by the present invention has the advantages of simple operation and can realize automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The color comparison diagram of the color change indicator label of the single dye and the composite dye in Example 1 before and after plasma treatment.

[0035] Figure 2 This is a color comparison diagram of the color change indicator labels of a single dye and a composite dye in Example 2 before and after plasma treatment.

[0036] Figure 3 The following is a color comparison diagram of the color change indicator labels of a single dye and a composite dye in Example 3 before and after plasma treatment.

[0037] Figure 4 This is a color comparison diagram of the color change indicator labels of a single dye and a composite dye in Example 4 before and after plasma treatment.

[0038] Figure 5 This is a color comparison diagram of the color change indicator labels of a single dye and a composite dye in Example 5 before and after plasma treatment.

[0039] Figure 6 This is a color comparison chart of the color-changing indicator label prepared in Example 6 before and after ultraviolet light irradiation, plasma treatment, and Gamma ray treatment.

[0040] Figure 7 This is a color comparison chart of the color-changing indicator labels prepared in Example 7 and Example 8 before and after plasma treatment.

[0041] Figure 8 This is a color comparison chart of the fresh label and the stored label prepared in Example 9 before and after plasma treatment.

[0042] Fig. 9 This is a color comparison chart of the color-changing indicator label prepared in Comparative Example 1 before and after plasma treatment. DETAILED DESCRIPTION

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0045] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods, and the materials, reagents, etc. used are all available from commercial sources unless otherwise specified.

[0046] Example 1

[0047] A method for preparing a color-changing indicator label comprises the following steps:

[0048] Congo red was dissolved in ethanol to prepare a 1.5 wt% Congo red solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 1 μm) with a spray gun, and after the ethanol was evaporated, a pink color change indicator label was obtained, such as Figure 1 shown.

[0049] Phenol red was dissolved in ethanol to prepare a phenol red solution with a concentration of 1.5 wt %. The solution was sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate was 1 μm) with a spray gun. After the ethanol was evaporated, a yellow color change indicator label was obtained. Figure 1 shown.

[0050] The Congo red solution and the phenol red solution are mixed at a mass ratio of 10:1 to obtain a mixed solution of a composite dye. The mixed solution is sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate is 1 μm) with a spray gun. After the ethanol is evaporated, a rose-red color change indicator label is obtained. Figure 1 shown.

[0051] The above color change indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 1 L / min, a treatment time of 60 s, and a power of 300 W. The color change of the label is as follows: Figure 1 As shown, the first label shows a fading effect, and the second label has no visual color change. Since the colors of these two labels before and after plasma treatment are similar in the color wheel, the human eye cannot accurately identify the change. Therefore, this color-changing indicator label is not suitable for plasma treatment indicator labels. Only the third label after color management shows non-similar colors before and after plasma treatment, from rose red to light green, which is a color difference that can be easily identified by the human eye. Therefore, this color-changing indicator label is suitable for plasma treatment detection.

[0052] Example 2

[0053] A method for preparing a color-changing indicator label comprises the following steps:

[0054] Dissolve p-nitrophenol in ethanol to prepare a p-nitrophenol solution with a concentration of 0.5wt%; spray the solution onto a sub-surface substrate containing an aqueous coating (substrate surface roughness is 0.5μm) with a spray gun, and after evaporating the ethanol, a light green color-changing indicator label is obtained, such as Figure 2 shown.

[0055] Direct violet was dissolved in ethanol to prepare a 1 wt% direct violet solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 0.5 μm) with a spray gun, and after the ethanol was evaporated, a purple color change indicator label was obtained, such as Figure 2 shown.

[0056] The p-nitrophenol solution and the direct violet solution are mixed at a mass ratio of 20:1 to obtain a mixed solution of a composite dye. The mixed solution is sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate is 0.5 μm) with a spray gun. After the ethanol is evaporated, a gray-blue color change indicator label is obtained. Figure 2 shown.

[0057] The above color change indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 2L / min, a treatment time of 60s, and a power of 400W. The color change of the label is as follows: Figure 2 As shown, the first and second labels show a fading effect. Since the colors before and after the color change are similar in the color wheel, the human eye cannot accurately identify the change. Therefore, the label is not suitable for plasma treatment detection. The third color-changing indicator label changes from gray-blue to purple. Only the third color-managed label shows non-similar colors before and after plasma treatment, which is a color difference that can be easily identified by the human eye. Therefore, the color-changing indicator label is suitable for plasma treatment detection.

[0058] Example 3

[0059] A method for preparing a color-changing indicator label comprises the following steps:

[0060] Alizarin Yellow R was dissolved in ethanol to prepare a 2 wt% Alizarin Yellow R solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 2.5 μm) with a spray gun, and after the ethanol was evaporated, a brownish yellow color change indicator label was obtained, such as Figure 3 shown.

[0061] Methylene blue was dissolved in ethanol to prepare a methylene blue solution with a concentration of 0.1 wt %; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 2.5 μm) with a spray gun, and after the ethanol was evaporated, a blue color-changing indicator label was obtained, such as Figure 3 shown.

[0062] The above-mentioned Alizarin Yellow R solution and methylene blue solution were mixed at a mass ratio of 20:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 2.5 μm) with a spray gun. After ethanol was evaporated, a black-gray color change indicator label was obtained, such as Figure 3 shown.

[0063] The above color change indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 2L / min, a treatment time of 20s, and a power of 200W. The color change of the label is as follows: Figure 3As shown, the first and second labels show a fading effect. Since the colors before and after the color change are similar in the color wheel, the human eye cannot accurately identify the change. Therefore, the color change indicator label is not suitable for plasma treatment detection. The third color change indicator label changes from dark gray to light green. Only the third color-managed label shows non-similar colors before and after plasma treatment, which is a color difference that can be easily identified by the human eye. Therefore, the color change indicator label is suitable for plasma treatment detection.

[0064] Example 4

[0065] A method for preparing a color-changing indicator label comprises the following steps:

[0066] Methyl violet was dissolved in water to prepare a 0.5 wt% methyl violet solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 0.1 μm) with a spray gun, and after the water evaporated, a purple color-changing indicator label was obtained, such as Figure 4 shown.

[0067] Peacock blue was dissolved in water to prepare a 0.1 wt% peacock blue solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate was 0.1 μm) with a spray gun, and after the water evaporated, a cyan color change indicator label was obtained, such as Figure 4 shown.

[0068] The methyl violet solution and the peacock blue solution are mixed at a mass ratio of 15:1 to obtain a mixed solution of a composite dye. The mixed solution is sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate is 0.1 μm) with a spray gun. After the water evaporates, a purple color change indicator label is obtained. Figure 4 shown.

[0069] The above color change indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 2L / min, a treatment time of 20s, and a power of 200W. The color change of the label is as follows: Figure 4 As shown, the first dye shows a fading effect, and the second dye has no visually visible color change. Since the colors before and after the color change are similar colors in the color wheel, the human eye cannot accurately identify the change. Therefore, the color change indicator label is not suitable for plasma treatment detection. The third color change indicator label changes from dark gray to light green. Only the third color-managed label shows non-similar colors before and after plasma treatment, which is a color difference that can be easily identified by the human eye. Therefore, the color change indicator label is suitable for plasma treatment detection.

[0070] Example 5

[0071] A method for preparing a color-changing indicator label comprises the following steps:

[0072] Methyl violet was dissolved in water to prepare a 0.5 wt% methyl violet solution; the solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness was 0.1 μm) with a spray gun, and after the water evaporated, a purple color-changing indicator label was obtained, such as Figure 5 shown.

[0073] Dissolve turmeric in water to prepare a 0.1 wt% turmeric solution; spray the solution onto a sub-surface substrate containing an aqueous coating (substrate surface roughness is 0.1 μm) with a spray gun, and after the water evaporates, a yellow color change indicator label is obtained, such as Figure 5 shown.

[0074] The methyl violet solution and the turmeric solution were mixed at a mass ratio of 15:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate was 0.1 μm) with a spray gun. After the water evaporated, a rose-red color change indicator label was obtained. Figure 5 shown.

[0075] The above color change indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 2L / min, a treatment time of 20s, and a power of 200W. The color change of the label is as follows: Figure 5 As shown, the first and second labels above show a fading effect. Since the colors before and after the color change are similar colors in the color wheel, the human eye cannot accurately identify the change. Therefore, the color-changing indicator label is not suitable for plasma treatment detection. The third color-changing indicator label above changes from rose red to yellow-green. Only the third color-managed label shows non-similar colors before and after plasma treatment, which is a color difference that can be easily identified by the human eye. Therefore, the color-changing indicator label is suitable for plasma treatment detection.

[0076] Example 6

[0077] A method for preparing a color-changing indicator label comprises the following steps:

[0078] Methyl red was dissolved in ethanol to prepare a 1.5 wt% methyl red solution; acid blue 9 was dissolved in ethanol to prepare a 1.5 wt% acid blue 9 solution; the methyl red solution and the acid blue 9 solution were mixed at a mass ratio of 8:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness of 2 μm) with a spray gun, and after the ethanol was volatilized, a green color change indicator label was obtained, such as Figure 6 shown.

[0079] The above color-changing indicator label is irradiated with ultraviolet light using an ultraviolet lamp with a wavelength of 800nm ​​for 3 minutes at a power of 30W, and the color-changing indicator label turns gray-red. Figure 6 shown.

[0080] The above color-changing indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 1 L / min, a treatment time of 60 s, and a power of 300 W. The color-changing indicator label turned pink. Figure 6 shown.

[0081] The color-changing indicator label is irradiated with Gamma rays at a dose of 1.0 kGy and an irradiation time of 30 seconds, and the color-changing indicator label turns plum red. Figure 6 shown.

[0082] Example 7

[0083] A method for preparing a color-changing indicator label comprises the following steps:

[0084] Methyl red was dissolved in ethanol to prepare a 1.5 wt% methyl red solution; acid blue 9 was dissolved in ethanol to prepare a 1.5 wt% acid blue 9 solution; the methyl red solution and the acid blue 9 solution were mixed at a mass ratio of 8:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (the surface roughness of the substrate was 1 μm) with a spray gun, and after the ethanol was evaporated, a yellow-green color change indicator label was obtained, such as Figure 7 shown.

[0085] The above color-changing indicator label was treated with plasma (body) using a gas discharge ion cleaning machine under the conditions of a gas flow rate of 1L / min, a treatment time of 60s, and a power of 300W. The color-changing indicator label turned pink. Figure 7 shown.

[0086] Example 8

[0087] A method for preparing a color-changing indicator label comprises the following steps:

[0088] Methyl red was dissolved in ethanol to prepare a 1.5 wt% methyl red solution; acid blue 9 was dissolved in ethanol to prepare a 1.5 wt% acid blue 9 solution; the methyl red solution and the acid blue 9 solution were mixed at a mass ratio of 8:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness of 2 μm) with a spray gun, and after the ethanol was volatilized, a green color change indicator label was obtained, such as Figure 7 shown.

[0089] The above color-changing indicator label was treated with plasma (body) using a gas discharge ion cleaning machine under the conditions of a gas flow rate of 1L / min, a treatment time of 60s, and a power of 300W. The color-changing indicator label turned pink. Figure 7 The color change indicator label prepared in the embodiment changes color more significantly before and after the plasma action, and the color change indicator label is suitable for plasma treatment detection.

[0090] Example 9

[0091] A method for preparing a color-changing indicator label comprises the following steps:

[0092] Congo red was dissolved in ethanol to prepare a 1.5 wt% Congo red solution; phenol red was dissolved in ethanol to prepare a 1.5 wt% phenol red solution; the Congo red solution and the phenol red solution were mixed at a mass ratio of 10:1 to obtain a mixed solution of a composite dye. The mixed solution was sprayed on a sub-surface substrate containing an aqueous coating (substrate surface roughness of 1 μm) with a spray gun, and after the ethanol was volatilized, a rose-red color-changing indicator label (fresh label) was obtained, such as Figure 8 shown.

[0093] The color change indicator label was stored in an atmospheric environment (20-35°C, 40%-70% RH) for one year, and no visible change was found in the appearance of the label, which still showed a rose red color. Figure 8 shown.

[0094] The two color-changing indicator labels (fresh label and stored label) were treated with plasma (body) using a gas discharge ion cleaning machine at a gas flow rate of 1L / min, a treatment time of 60s, and a power of 300W. Both labels changed from rose red to light green, and the indication effect of the stored label was consistent with that of the fresh label. The results show that this label can be stored in the atmosphere without low-temperature storage, and the shelf life is greater than 1 year.

[0095] Comparative Example 1

[0096] A method for preparing a color-changing indicator label comprises the following steps:

[0097] Alizarin Yellow R was dissolved in ethanol to prepare an Alizarin Yellow R solution with a concentration of 2 wt %; methylene blue was dissolved in ethanol to prepare a methylene blue solution with a concentration of 0.1 wt %; the Alizarin Yellow R solution and the methylene blue solution were sprayed onto a sub-surface substrate containing an aqueous coating (substrate surface roughness was 2.5 μm) in sequence at a mass ratio of 20:1, and after ethanol was evaporated, a red label was obtained, as shown in FIG. Figure 8 shown.

[0098] The above color-changing indicator label was treated with plasma using a gas discharge ion cleaning machine at a gas flow rate of 2 L / min, a treatment time of 20 s, and a power of 200 W. Figure 8 As shown, the label is still red. Since the colors before and after the color change are similar in the color wheel, the human eye cannot accurately identify the change. Therefore, the color-changing indicator label is not suitable for plasma treatment detection.

[0099] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art should understand that other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for preparing a color-changing indicator label, characterized in that: The following steps are involved: coating a solution containing a composite dye on a substrate, and removing the solvent in the solution to obtain the color-changing indicator label; At least one dye in the composite dye in the indication area of ​​the color-changing indication label is decolorized or changed color after treatment, and after being superimposed with other dyes in the composite dye, the composite dye presents different colors before and after treatment.

2. The preparation method according to claim 1, characterized in that: The dye that decolorizes or changes color after treatment is selected from one or more of methyl violet, direct violet, acid blue 9, solvent blue 5, m-cresol violet, thymol blue, alizarin yellow R, bromophenol blue, Congo red, turmeric, neutral red, bromocresol green, phenol red, p-nitrophenol, alizarin red, methyl red, phenol red, methyl blue, methylene blue, rhodamine-6G, rhodamine-B, brilliant blue-R, brilliant blue-G, peacock blue, acridine orange, bromocresol green and direct red 80.

3. The preparation method according to claim 1, characterized in that: The colors of the dye that is decolorized or changed after treatment in the composite dye and other dyes before treatment are non-similar colors.

4. The preparation method according to claim 1, characterized in that: The roughness of the substrate is 0-2.5 μm.

5. The preparation method according to claim 1, characterized in that: The coating method is selected from one or more of spray coating, dip coating, drop coating, brush coating, slit coating and spin coating.

6. The preparation method according to claim 1, characterized in that: The solution containing the composite dye is coated on the substrate at one time, or solutions of different dyes are coated on the substrate in sequence.

7. The preparation method according to claim 1, characterized in that: After removing the solvent from the solution, the method further includes heating and humidifying steps.

8. The preparation method according to claim 1, characterized in that: The treatment method is plasma treatment, Gamma ray irradiation treatment or ultraviolet irradiation treatment.

9. A color-changing indicator label prepared by the method according to any one of claims 1 to 8.

10. Use of the color-changing indicator label according to claim 9 in the detection of plasma treatment, gamma ray irradiation treatment and ultraviolet irradiation treatment.

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