CN112284564A

CN112284564A - Temperature sensing warning indicator and preparation method thereof

Info

Publication number: CN112284564A
Application number: CN202011378253.4A
Authority: CN
Inventors: 单浩然; 俞晓红; 李强; 郑杨明; 郑伟真
Original assignee: Junlei Environmental Protection Technology Shenzhen Co ltd; CCL Label Hefei Co Ltd
Current assignee: Junlei Environmental Protection Technology Shenzhen Co ltd; CCL Label Hefei Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-01-29

Abstract

The invention discloses a temperature sensing warning indicator and a preparation method thereof, wherein the temperature sensing warning indicator comprises a color changing part and an excitation part; the color changing part comprises a substrate layer, a color ink layer and an opaque layer which are arranged in sequence; the excitation part comprises a solvent layer and a covering layer which are arranged in sequence; the solvent layer is attached to one side of the opaque layer, which is far away from the color ink layer; when the temperature-sensing warning indicator is above the set indicating temperature range, the phase-change solvent of the solvent layer is changed from solid to liquid and enters the color ink layer through the opaque layer, so that at least part of the color ink layer is transferred to the side, away from the color ink layer, of the opaque layer. When the temperature is higher than the phase change point, the color of the color ink layer is transferred to one side of the opaque layer, which is far away from the color ink layer, under the action of the liquid phase change material, so that the color/pattern on the two sides of the opaque layer is changed, and whether the indicator is exposed to the temperature higher than the phase change point or not is detected and recorded, and the temperature-sensing warning indicator has the advantages of obvious color change, rich color pattern selection and low cost.

Description

Temperature sensing warning indicator and preparation method thereof

Technical Field

The invention relates to the technical field of temperature monitoring, in particular to a temperature sensing warning indicator and a preparation method thereof.

Background

At present, temperature-sensitive products such as food and drug products, vaccines and the like need to be controlled within a certain temperature range in the production, transportation and storage processes, and how to monitor the products to meet the product design requirements (especially the low-temperature requirements) in the transportation and storage processes is a problem to be solved urgently by the technical staff in the field in consideration of the complexity of the transportation and storage processes.

In the prior art, as mentioned in the chinese patent application No. CN200420078916.0, the capillary action principle of a simple thermometer is used to make a color-changeable device when the ambient temperature exceeds the set temperature, the device has a relatively large volume and the cold chain product has a relatively small volume, and key components of the device are fragile and difficult to use. In addition, the british timeslip company provides a color-changing label device in a patent with the patent publication number of CN1533518A applied in china, a solution gradually permeates into an observation area after a capsule filled with a solvent is crushed, and the color-changing label device can lose efficacy within a few minutes for a short person and a few hours for a later person after being used, only can measure cold chain transportation time and cannot measure whether a cold chain environment exceeds a set dangerous temperature, and meanwhile, the color-changing label device has the problems of complex structure, high cost and large volume and limits the popularization and application of the color-changing label device.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides the temperature sensing warning indicator and the preparation method thereof, which utilize the solubility of a phase-change material to specific paint/ink to carry out color migration so as to realize temperature indication.

In order to achieve the purpose, the invention adopts the technical scheme that:

a temperature sensing warning indicator comprises a color changing part and an excitation part; the color changing part comprises a substrate layer, a color ink layer and an opaque layer which are arranged in sequence; the excitation part comprises a solvent layer and a covering layer which are arranged in sequence; the solvent layer is attached to one side of the opaque layer, which is far away from the color ink layer; when the temperature-sensing warning indicator is above the set indicating temperature range, the phase-change solvent of the solvent layer is changed from solid to liquid and enters the color ink layer through the opaque layer, so that at least part of the color ink layer is transferred to the side, away from the color ink layer, of the opaque layer.

A temperature sensing warning indicator is prepared by adopting a secondary forming method or a primary forming method;

the secondary forming method is to form the color-changing part and the exciting part respectively, and has no special requirement on the environmental temperature during forming, and specifically comprises the following steps:

s1: manufacturing a color changing part: printing a color ink layer and an opaque layer on the substrate layer in sequence;

s2: manufacturing an excitation part:

forming a solvent layer with an open accommodating cavity on the easy-to-uncover layer through die cutting and laminating, printing ink printing and glue coating, then filling a phase change solvent, a phase change solvent microcapsule or a porous material/microfiber material which absorbs the phase change solvent in the open accommodating cavity, and finally covering a covering layer on one side of the solvent layer, which is far away from the easy-to-uncover layer, so as to seal the open accommodating cavity;

or forming an open accommodating cavity on the covering layer through die cutting, laminating, stamping and laser ablation, then filling the open accommodating cavity with a phase change solvent, a phase change solvent microcapsule or a porous material/microfiber material which absorbs the phase change solvent, and finally covering an easy-to-uncover layer on one side of the solvent layer, which is far away from the covering layer, so as to seal the open accommodating cavity;

s3: when in use, the excitation part and the color-changing part are arranged below the temperature of the phase change point, and the easy-to-uncover layer of the excitation part is removed and is attached to the color-changing part;

the one-step forming method is to integrally form the color changing part and the exciting part, and specifically comprises the following steps:

in the environment lower than the phase change point, a printing, gluing or laminating mode is adopted, a color ink layer, an opaque layer, a solvent layer and a covering layer are sequentially arranged on a substrate layer, and the substrate layer is required to be arranged in the environment lower than the phase change point before and during use;

or in the environment higher than the phase change point, the color ink layer, the opaque layer, the microcapsule solvent layer and the covering layer are sequentially arranged on the substrate layer in a printing, gluing or laminating mode, and when the microcapsule activating device is used, the microcapsules are activated at the temperature lower than the phase change point.

Compared with the prior art, the invention has the advantages that: the solvent material is solid when being lower than a phase change point, has no fluidity, is liquid when being higher than the phase change point, and has solubility to specific paint/ink; the structure is in a layer structure or a non-contact interval structure at the temperature lower than the phase change point, and no obvious change occurs; when the temperature is higher than the phase change point, the liquid ink has fluidity and solubility, micropores and capillary channels are formed, the solvent permeates from the surface layer of the opaque layer, most or even all of the small molecular color ink of the color ink layer migrates from the original bottom layer to the opaque surface layer under the action of the solvent, the excellent migration-color bleeding effect is shown, namely, the color/form different from the original color/form can be shown, and whether the indicator is exposed to the temperature higher than the phase change point or not can be detected and recorded by utilizing the characteristic. And the color ink and the opaque layer have wide selection range, and the selection range of colors and figures can be enriched.

Drawings

Fig. 1 is a first structural schematic diagram of the temperature sensing warning indicator of the present invention.

Fig. 2 is a second structural schematic diagram of the temperature sensing warning indicator of the present invention.

Fig. 3 is a third schematic structural view of the temperature sensing warning indicator of the present invention.

FIG. 4 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 1 of the present invention before and after use.

FIG. 5 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 2 of the present invention before and after use.

FIG. 6 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 3 of the present invention before and after use.

FIG. 7 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 4 of the present invention before and after use.

FIG. 8 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 5 of the present invention before and after use.

FIG. 9 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method according to example 6 of the present invention before and after use.

FIG. 10 is a schematic view of a temperature sensitive warning indicator prepared by a two-shot forming method in example 7 of the present invention before and after use.

FIG. 11 is a schematic view of a temperature sensitive warning indicator prepared by a one-shot forming method in example 8 of the present invention before and after use.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of embodiments of the present invention, and not all embodiments.

In describing the present invention, it is to be understood that the terms "first," "second," and the like are not intended to denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1 to 3, a temperature sensitive warning indicator includes a color changing part a and an exciting part B, which are partially or wholly overlapped and laminated.

The color changing section a includes a base layer 1, a color ink layer 2, and an opaque layer 3, which are sequentially disposed, and in order to adjust the color developing sensitivity, a buffer layer 6 may be disposed on a side of the opaque layer 3 away from the color ink layer 2, as shown in fig. 1 and 3, or the buffer layer 6 may be disposed between the color ink layer 2 and the opaque layer 3, as shown in fig. 2. The excitation part B comprises a solvent layer 4 and a covering layer 5 which are sequentially arranged, and the solvent layer 4 of the excitation part B is attached to the buffer layer 6 or the opaque layer 3 of the color changing part A.

The color ink layer 2 can be characters, patterns or color blocks, and adopts organic micromolecules: dye, pigment, nanometer color paste or small particle pigment. Including but not limited to: natural dyes, synthetic dyes: such as azo dyes, anthraquinone dyes, arylmethane dyes, indigoid dyes, sulfur dyes, phthalocyanine dyes, quinonimine dyes, quinoline dyes, cyanine dyes, nitroso dyes, nitro dyes, copper oxine dyes, yellow actinide dyes, methine and polymethine dyes, stilbene dyes, and various heterocyclic dyes, and the like. Various pigments of animal and plant origin: cochineal red, lac red, phycocyanin, ichthyol foil, hematoxylon-phycochrome, shrimp shell pigment, lobster red pigment, crab shell pigment, algae blue pigment, nostoc blue pigment, and laver pigment. Carotenoids, flavonoids, polyphenols, chlorophyll, alkaloids, diketones, indoles, carotene, microbial fermentation pigments, and microbial fermentation pigments. Nanometer color paste with particle size less than 125nm, etc. The small organic molecules have a molecular weight of less than 1500, preferably less than 800.

The opaque layer 3 is a porous layer structure made of metal pigment, metal-medium composite pigment, pearl, opaque porous material, opaque microporous film, mica and opaque pigment, and preferably has a transparency of 0-50%. The buffer layer 6 is made of porous material, including alumina, silica, aerogel, corncob, activated carbon, nanotube, chromatography silicon, microfiber, microsponge, microemulsion, etc.

The solvent layer 4 has at least one open-type accommodating cavity, and the phase-change solvent is filled in the open-type accommodating cavity in a liquid core, microcapsule, porous medium adsorption state or microfiber adsorption state to form a phase-change solvent area. The open receiving cavity may be formed by die cutting, hole forming lamination, ink printing, glue coating or mechanical (or high temperature assisted) stamping, laser ablation, etc.

The phase change solvent may be selected from esters, alkanes, alcohols, acids, ketones, including but not limited to: amyl formate, ethyl formate, butyl acetate, ethyl acetate, vinyl acetate, banana oil, propyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, ethyl cinnamate, cyclohexyl acetate, hexyl acetate, benzyl benzoate, methyl laurate, ethyl laurate, propyl laurate, isopropyl myristate, methyl cinnamate, triphenyl phosphite, dimethyl adipate, dimethyl carbonate, diethyl sebacate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diallyl phthalate, isopropyl palmitate, ethyl palmitate, methyl palmitate, isobornyl acetate, diethyl fumarate, glyceryl triacetate; isopropanol, butanol, pentanol, 2 hexanol, nonanol, n-decanol, 2-methyl-2-butanol, 1, 4-butanediol, glycerol, n-dodecanol; 2-decanone, acetophenone, 2-undecanone, butanedione, ambroxone, coumarin, p-tert-butylbenzone, 1, 3-dimethyl-2-imidazolidinone, 3-acetylpyridine, 2-acetylpyridine, m-nitrotoluene, methylnonyl ketone, 2, 3-heptanedione, 1-acetonaphthalene, 2-isopropylnaphthalene, 1-tetralone, 4-acetylpyridine; diphenylmethane, cyclohexane, phenylcyclohexane, p-xylene, diphenylmethane, dodecane, tridecane, tetradecane, pentadecane, hexadecane hexadecene, n-heptadecene, liquid paraffin; one or more of docosahexaenoic acid, arachidonic acid, acetic acid, propionic acid, butyric acid, valeric acid, alpha-linolenic acid, oleic acid, linoleic acid, ricinoleic acid, n-octanoic acid, n-heptanoic acid and nonanoic acid. The phase change solvent preferably has a phase change point temperature in the range of-90 ℃ to 20 ℃.

The substrate layer 1 and the cover layer 5 may be made of transparent or translucent ink layers or PET, BOPP, PP, OPP, PE, PVC, PVA, EVA, PA, PS, PU, films, paper, etc.

The temperature sensing warning indicator of the application, the color changing part A and the exciting part B can adopt a split structure, and the structure is preferably provided with an easy-to-uncover layer 9 (refer to fig. 4) on one side of the solvent layer 4 departing from the covering layer 5 so as to seal the open accommodating cavity, and of course, if the temperature sensing warning indicator is manufactured and transported below a phase change temperature point, the easy-to-uncover layer 9 can not be arranged. When the phase change solvent is used, the color change part A and the excitation part B are placed below the temperature of a phase change point, the easy-to-uncover layer 9 of the excitation part B is removed and is attached to the color change part A to complete activation, and if the phase change solvent is in a microcapsule form, an external force is applied to crush the microcapsule to activate.

The color changing part A and the exciting part B can also adopt an integrated structure, and the open accommodating cavity of the solvent layer 4 can be closed by the buffer layer 6 or the opaque layer 3, so that the color changing part A and the exciting part B can be directly used. The integrated structure needs to be manufactured and used under the phase change point of the solvent, if the phase change solvent adopts a microcapsule structure, the manufacturing process does not have special temperature requirements, but external force is applied to crush the microcapsule to activate the microcapsule when the integrated structure is used.

The utility model provides a temperature sensing warning indicator,

color ink layer

2 and 4 layering settings on solvent layer, and the centre sets up opaque layer 3, be the solid when ambient temperature is less than phase change material's melting point, obvious migration can not take place for the colour of color ink layer 2, be liquid when ambient temperature is higher than phase change material's melting point, the solvent permeates from the top layer of opaque layer 3, under the effect of solvent, the colour most part of color ink layer 2 even all migrates to opaque top layer from original bottom, obvious migration and bleeding effect take place, the colour or the pattern that show as opaque layer both sides all change, and through setting up buffer layer 6, temperature stress sensitivity is controllable, the colour changes obviously, the color figure is selected abundantly, and the principle of discolouing is showing differently, it is with low costs. Specific variations may include the following 3 display scenarios:

in case 1, as shown in fig. 1, an adhesive layer 7 and a release film 8 are disposed on a substrate layer 1 of a color changing portion a, when the release film 8 is torn off to attach the temperature-sensitive warning indicator to a product at a temperature to be monitored, an opaque layer 3 faces outward, when the temperature is lower than a phase change point, the color ink layer 2 is invisible due to a shielding effect of the opaque layer 3, when the temperature is higher than the phase change point, a phase change solvent in the solvent layer 4 melts and flows to the color ink layer 2 through the buffer layer 6 and micropores of the opaque layer 3, a dye or a small molecule pigment of the color ink layer 2 passes through the opaque layer 3 under the effect of the liquid phase change solvent and migrates to an outward surface of the opaque layer 3, which is macroscopically represented as that the color of the color ink layer 2 migrates to the surface of the opaque layer 3, that is, a significant color or pattern change appears on the surface of the opaque layer 3 is visible. In this case, the color or pattern of the color ink layer 2 may be displayed on the surface of the opaque layer 3, or the color of the surface of the opaque layer 3 may be superimposed to form a new color or pattern, or the original color or pattern of the surface of the opaque layer 3 may disappear.

In case 2, as shown in fig. 2, an adhesive layer 7 and a release film 8 are disposed on the cover layer 5 of the excitation portion B, when the release film 8 is torn off to attach the temperature-sensitive warning indicator to a product at a temperature to be monitored, the color ink layer 2 faces outward, when the temperature is lower than the phase change point, the color or the pattern on the color ink layer 2 is clearly visible, when the temperature is higher than the phase change point, the phase change solvent in the solvent layer 4 is melted, the dye or the small molecule pigment of the color ink layer 2 migrates to the inward surface of the opaque layer 3 under the action of the liquid phase change solvent, macroscopically, the color of the color ink layer 2 migrates into the opaque layer 3, and the visible color or the pattern disappears due to the shielding effect of the opaque layer 3.

In case 3, as shown in fig. 3, the temperature-sensitive warning indicator is suspended to monitor the ambient temperature, and therefore, it is not necessary to provide the adhesive layer 7 and the release film 8, the color ink layer 2 contains the migrating pigment and the non-migrating pigment, the color thereof is the superposition of the two pigments, or the overlay of the two pigments, when the temperature is higher than the phase change point, the migrating pigment of the color ink layer 2 migrates to the other side (i.e. the phase change material side) of the opaque layer 3, so that the two sides of the opaque layer 3 can see significant color or pattern changes.

The preparation and use of the temperature sensitive warning indicator of the present application are further illustrated by the following specific examples.

Example 1

As shown in fig. 4, the basic structure is as follows: film material/red dye layer/aluminum pigment layer/silica buffer layer/adhesive sticker-film cutting cavity and solvent core layer/adhesive sticker film face material.

The manufacturing steps are as follows:

preparation of color-changing part A:

the first step is as follows: a film material (base layer 1) such as 50um clear PA is chosen.

The second step is that: sequentially coating a red dye layer (a color ink layer 2), an aluminum pigment layer (an opaque layer 3) and a silicon dioxide buffer layer (a buffer layer 6); wherein the red dye layer is the text "spent".

The third step: and die cutting for later use.

Preparation of excitation part B:

firstly, coating or printing a release layer on a thin film substrate (an easy-to-uncover layer 9), or partially hollowing the release layer (the hollow area is similar to the solvent containing cavity in size and corresponds to the solvent containing cavity in position). Optionally, the release layer near the solvent accommodating cavity is cut and half-penetrated, so that the non-setting adhesive in the later process flows into the release layer, and the solvent in the cavity can be better locked in the later process.

Secondly, cutting holes on the film surface material with the adhesive, discharging waste, and then laminating the film surface material with the release layer prepared in the first step with the film substrate to form a solvent containing cavity;

thirdly, dimethyl adipate (DMA) with the melting point of 8 ℃ is selected as a solvent material, and the DMA solvent material is filled into the cavity in a coating or positioning printing mode to form a solvent layer 4;

and fourthly, laminating a film surface material (covering layer 5) with self-adhesive on the solvent layer 4 with the cavity in the third step to lock the DMA.

When the device is used, in a low-temperature environment (at the temperature of a phase change point), the film substrate of the excitation part B is torn off and is attached to the surface of the color change part A, so that activation is completed, and the device is placed near a product needing temperature monitoring. In this embodiment, the excitation portion B and the color-changing portion a start to be activated after being pasted together, and can be pasted on a product at a desired monitoring temperature by tearing off the release film 8 at the bottom of the color-changing portion a, and when the temperature is higher than the phase change point, the red "failure" at the back is transferred to the silver at the front, so that the red "failure" occurs at the silver at the front.

Example 2

As shown in fig. 5, the basic structure is as follows: film material/red-green-blue dye layer/aluminium pigment layer/aluminium oxide buffer layer/non-drying adhesive-heat-sealing film cutting cavity and solvent core layer/heat-sealing covering layer.

The manufacturing steps are as follows:

preparation of color-changing part A: the procedure is as in example 1, wherein the color ink layer 2 is a black layer composed of a red-green-blue dye layer, and the opaque layer 3 is printed with a symbol of "√" by a blue dye after printing the aluminum pigment layer.

Preparation of excitation part B:

firstly, coating or printing a release layer on a thin film substrate (an easy-to-uncover layer 9), or partially hollowing the release layer (the hollow area is similar to the solvent containing cavity in size and corresponds to the solvent containing cavity in position). Furthermore, the release layer near the solvent containing cavity can be cut and half-penetrated, so that the non-setting adhesive in the later process flows into the release layer, and the solvent in the cavity can be better locked in the later process.

Secondly, cutting holes on the heat-sealing film surface material with the adhesive, discharging waste, and laminating the film surface material with the release layer and the film substrate with the release layer to form a solvent containing cavity;

thirdly, diallyl phthalate with the melting point of-70 ℃ is selected as a solvent material, and the diallyl phthalate solvent material is filled into the cavity in a coating or positioning printing mode to form a solvent layer 4;

and fourthly, heat-sealing and covering a heat-sealing film surface material (covering layer 5) on the solvent layer 4 with the cavity in the third step to lock the diallyl phthalate.

Using the method as in example 1, when the temperature is above the phase transition point, the red, green and blue dye on the back migrates to the top of the aluminum pigment and the blue color "√" on the surface of the opaque layer 3 disappears.

Example 3

As shown in fig. 6, the basic structure is as follows: film material/blue nanometer pigment layer/pearl pigment layer/corncob silicon buffer layer/self-adhesive film-cutting cavity and solvent core layer/self-adhesive film surface material.

The manufacturing steps are as follows:

preparation of color-changing part A:

the first step is as follows: selecting a film material (a substrate layer 1), such as 50um PET;

the second step is that: sequentially coating a blue nano pigment layer (a color ink layer 2), a pearl pigment layer (an opaque layer 3) and a corncob buffer layer (a buffer layer 6);

the third step: and die cutting for later use.

Preparation of excitation part B:

firstly, cutting holes on a film surface material with glue, discharging waste, and covering the surface material on a film substrate (an easy-to-uncover layer 9) to form a solvent accommodating cavity;

the second step is that: selecting butanedione with the melting point of-3 to-4 ℃ as a solvent material, and filling the butanedione solvent material into the cavity in a coating or positioning printing mode to form a solvent layer 4;

and thirdly, laminating a self-adhesive film surface material (a covering layer 5) on the solvent layer 4 with the cavity in the second step to lock the butanedione.

The using method is as in embodiment 1, and the adhesive sticker with the repeated sticking function is mostly adopted in the structure.

Example 4

As shown in fig. 7, the basic structure is as follows: film material/red dye layer/optically variable pigment layer/microfibre buffer layer/adhesive sticker-n-heptanoic acid mixed layer/film surface material.

The manufacturing steps are as follows:

manufacturing a color changing part:

the first step is as follows: selecting a film material (a substrate layer 1), such as 50um PP;

the second step is that: sequentially coating a red dye layer (a color ink layer 2), a light variable pigment layer (an opaque layer 3) and a microfiber buffer layer (a buffer layer 6);

the third step: and die cutting for later use.

Preparation of excitation part B:

selecting n-heptanoic acid with a melting point of-7.5 ℃ as a solvent material, coating the n-heptanoic acid on a film substrate (an easy-to-uncover layer 9) and then compounding the n-heptanoic acid with a film surface material (a covering layer 5) with self-adhesive; or directly mixing n-heptanoic acid into the adhesive sticker and then coating the adhesive sticker with a film substrate.

The application method is as in example 1, and the optically variable pigment layer has an anti-counterfeiting function.

Example 5

As shown in fig. 8, the basic structure is as follows: film material/red dye layer/titanium pigment layer/carbon nanotube buffer layer/adhesive sticker-film cutting cavity and solvent core layer/ink covering layer.

The manufacturing steps are as follows:

manufacturing a color changing part: same as example 1

Manufacturing an excitation part:

Secondly, cutting holes on the film surface material with the adhesive, discharging waste, and then laminating the film surface material with the release layer manufactured in the first step with the film substrate to manufacture a solvent containing cavity;

thirdly, filling the phenylcyclohexane solvent material into the cavity in a coating or positioning printing mode to form a solvent layer 4;

fourthly, covering the upper surface of the solvent layer 4 with the cavity in the third step by UV printing ink in a transfer printing mode and the like to lock the phenylcyclohexane and form a covering layer 5

The procedure was as in example 1.

Example 6

As shown in fig. 9, the basic structure is as follows: film material/red dye layer/aluminum pigment layer/micro-emulsion buffer layer/solvent core layer/pressure sensitive adhesive film surface material punched into convex cavity.

The manufacturing steps are as follows:

manufacturing a color changing part: same as example 1

Manufacturing an excitation part:

firstly, stamping a self-adhesive film surface material (covering layer 5) to form a three-dimensional surface (solvent containing cavity), directionally printing and coating dimethyl carbonate in the cavity, and covering the dimethyl carbonate with a film substrate (easy-to-uncover layer 9) to lock the dimethyl carbonate. The film substrate may have a release layer thereon, but is not required.

Method of use as in example 1

Example 7

As shown in fig. 10, the structure is the same as that of example 6, wherein the micro-emulsion buffer layer is changed to a buffer layer with diffusion: the fiber paper layer, the solvent cavity and the color ink layer are arranged in a staggered mode. The solvent diffuses from the near end to the far end, the time and the amplitude of the overtemperature can be estimated according to the diffusion distance, and the longer the diffusion is, the longer the overtemperature time is or the larger the overtemperature amplitude is, so that the influence degree can be estimated.

Example 8

As shown in fig. 11, the color changing part a and the excitation part B are integrally designed: the substrate layer 1, the color ink layer 2, the opaque aluminum pigment layer 3, the buffer layer 6, the solvent layer 4 and the covering layer 5 are printed or coated in sequence. The solvent material is coated into pressure-sensitive microcapsules to form printable ink, and the central solvent layer 4 is formed by coating or printing.

In use, the integrated material is placed in a low-temperature environment (at the temperature of the phase transformation point) near a product needing to be monitored. In this embodiment, the release film 8 at the bottom of the discoloring part a can be torn off and attached to a product at a desired monitoring temperature, and activation is completed below the temperature of the phase change point by means of pressure and the like. Additionally, a layer of scratch silver was printed on the surface of the cover layer and the scratch silver was scraped off by applying pressure during use to verify that the microcapsules had been activated.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims

1. A temperature sensing warning indicator is characterized in that: comprises a color changing part and an exciting part; the color changing part comprises a substrate layer, a color ink layer and an opaque layer which are arranged in sequence; the excitation part comprises a solvent layer and a covering layer which are arranged in sequence; the solvent layer is attached to one side of the opaque layer, which is far away from the color ink layer; when the temperature-sensing warning indicator is above the set indicating temperature range, the phase-change solvent of the solvent layer is changed from solid to liquid and enters the color ink layer through the opaque layer, so that at least part of the color ink layer is transferred to the side, away from the color ink layer, of the opaque layer.

2. The temperature sensitive warning indicator of claim 1, wherein: the color ink layer is mainly in a character, pattern or color block-shaped layer structure made of dye, pigment, nano color paste or small-particle pigment with the molecular weight less than 1500.

3. The temperature sensitive warning indicator of claim 1, wherein: the opaque layer is mainly of a layer structure made of metal pigment, metal-medium composite pigment, pearly luster, opaque porous material, opaque microporous membrane, mica and opaque pigment, and the transparency is 0-50%.

4. The temperature sensitive warning indicator of claim 1, wherein: the solvent layer is provided with at least one open accommodating cavity, and the phase-change solvent is filled in the open accommodating cavity in a liquid core, microcapsule, porous medium adsorption or microfiber adsorption state.

5. The temperature-sensitive warning indicator of claim 4, wherein: the phase change point temperature range of the phase change solvent is-30 ℃ to 20 ℃.

6. The temperature-sensitive warning indicator of claim 4, wherein: the color changing part and the excitation part are of split structures, and one side of the solvent layer, which is far away from the covering layer, is provided with an easy-to-uncover layer for closing the open accommodating cavity.

7. The temperature-sensitive warning indicator of claim 4, wherein: the open receiving cavity is made by die cutting lamination, ink printing, glue coating, mechanical stamping or laser ablation.

8. The temperature sensitive warning indicator of claim 1, wherein: the color changing part also comprises a buffer layer made of porous materials and arranged between the opaque layer and the color ink layer or arranged on one side of the opaque layer, which is far away from the color ink layer.

9. The temperature sensitive warning indicator of claim 1, wherein: the base layer is away from one side of the color ink layer, or the covering layer is sequentially provided with a bonding layer and a release film.

10. A preparation method of a temperature sensing warning indicator is characterized by comprising the following steps: adopting a secondary forming method or a primary forming method;

s2: manufacturing an excitation part: