CN113390521A - Temperature indicating device - Google Patents
Temperature indicating device Download PDFInfo
- Publication number
- CN113390521A CN113390521A CN202110775485.1A CN202110775485A CN113390521A CN 113390521 A CN113390521 A CN 113390521A CN 202110775485 A CN202110775485 A CN 202110775485A CN 113390521 A CN113390521 A CN 113390521A
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- China
- Prior art keywords
- temperature
- porous hollow
- hydrogel
- reactant
- indicating device
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
- G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
Abstract
The invention relates to a temperature indicating device, which utilizes porous hollow microspheres with surfaces grafted with hydrogel, wherein the hydrogel grafted on the porous hollow microspheres blocks a phase change solvent containing a reactant A into the porous hollow microspheres when the temperature of the hydrogel is lower than the response temperature, and isolates a reactant B to the outside of the porous hollow microspheres; when the indicating device is above the critical temperature, the hydrogel shrinks in volume, the pore channels of the porous hollow microspheres are shown, and the phase-change solvent melts and permeates to the outside of the porous hollow microspheres to react and develop the color of the reactant A and the reactant B. The structural design can prepare the reactant A and the reactant B into the same layer of the temperature indicating device, and compared with the traditional multilayer structural design, the structural design is simple, and the reactant A and the reactant B are easy to react and develop color, so that the temperature of a product is indicated, and the temperature indicating sensitivity is high.
Description
Technical Field
The invention relates to the technical field of temperature monitoring and application, in particular to a temperature indicating device.
Background
In the handling of certain products, particularly in the medical industry, it is important to track temperature, for example, to monitor cumulative thermal exposure and threshold thermal events of certain medical products, which can be rendered ineffective by the cumulative heat of many medical products exposed to certain heat levels for extended periods of time, and which can also cause damage to the product when exposed to temperatures above certain threshold limits. In addition to medical products, other materials (e.g., perishable foods) must also be stored at temperatures or otherwise deteriorate at temperatures or amounts of cumulative thermal exposure. To solve these problems, there are currently many people who attach temperature indicators to containers for such products, in order to determine whether the product has reached a particularly harmful temperature, and thus take effective measures to avoid product damage.
The means of temperature monitoring in the current market can be divided into electronic and non-electronic technologies. The electronic technical instrument generally has larger volume, is suitable for large products or whole boxes of products, and has higher cost. In a non-electronic temperature monitor, the technical scheme of chinese patent application No. CN200420078916.0 mentions that the capillary action principle of a simple thermometer is used to make a color-changeable device when the ambient temperature exceeds a set temperature, the device has a relatively large volume, is relatively small in product volume and is not suitable for use, and key parts of the device are fragile and not easy to use. The british timeslip company provides a color-changing label device in a patent with the patent publication number of CN1533518A applied in china, and the color-changing label device gradually permeates a solution to an observation area after a capsule filled with a solvent is crushed, so as to perform monitoring, but once the monitoring product designed in the scheme is used, the monitoring product can lose efficacy in a few minutes for a short person and hours for a later person, and can only measure cold chain transportation time but cannot measure whether a cold chain environment exceeds a set dangerous temperature, and meanwhile, the product has the problems of complex structure, high cost and large volume, and the popularization and application of the monitoring product are limited.
Therefore, the invention of the cheap and convenient temperature detector has important significance for the safety of medical products, food and the like.
Disclosure of Invention
The temperature indicating device mainly solves the monitoring problems of the accumulated heat exposure and the specific threshold temperature of products in certain special industries and provides the temperature indicating device.
In order to achieve the above object, the present application provides a temperature indicating device, including a base layer and a functional layer disposed on the base layer and used for indicating temperature, wherein the functional layer includes a plurality of porous hollow microspheres grafted with hydrogel, a phase change solvent containing a reactant a, a reactant B, and a sol for fixing the reactant B; when the temperature indicating device is placed in an environment below the volume phase transition temperature of the hydrogel, the hydrogel blocks the phase change solvent into the interior of the porous hollow microspheres and isolates the reactant B from the exterior of the porous hollow microspheres, when the temperature indicating device is placed in an environment above the volume phase transition temperature of the hydrogel, the hydrogel shrinks in volume, the pore channels of the porous hollow microspheres are shown, and the phase change solvent melts and permeates into the exterior of the porous hollow microspheres to react and develop the reactant A and the reactant B, so that the temperature of a product is indicated.
As a further improvement of the present application, the phase change solvent has a solid-liquid phase transition temperature not higher than the volume phase transition temperature of the hydrogel, and the response temperature of the temperature indicating device is the volume phase transition temperature of the hydrogel.
As a further improvement of the application, the wall material of the porous hollow microsphere is selected from at least one of polystyrene, polyaryletherketone, polyetheretherketone, polyarmide, polyimide, polyethylene, polystyrene-polyvinylaniline hydrochloride copolymer, polystyrene-divinylbenzene copolymer, polylactic acid-glycolic acid copolymer, polymethyl methacrylate, glycidyl methacrylate-ethylene dimethacrylate copolymer and PVA.
As a further improvement of the present application, the hydrogel is at least one of poly (N-isopropylacrylamide), chitosan, polyacrylamide, cellulose derivatives, polyoxyethylene, polyoxypropylene, polylactic acid, polyethylene glycol, poly (epsilon-caprolactone-glycolide), poly (epsilon-caprolactone-p-dioxanone), polyester, poly (2-methyl-2-propenoic acid-2- (2-methoxyethoxy) ethyl ester-co-OEGMA), polyhydroxyethylmethacrylate.
As a further improvement of the application, the mass percentage of the hydrogel is not more than 20% of the mass percentage of the porous hollow microspheres.
As a further improvement of the application, the mass percentage of the hydrogel is not more than 10% of the mass percentage of the porous hollow microspheres.
As a further improvement of the application, the mass percentage of the hydrogel is not more than 5% of the mass percentage of the porous hollow microspheres.
As a further improvement of the present application, the phase change solvent is at least one of tetradecane, pentadecane, hexadecane, heptadecane, octadecane, eicosane, docosane, tetracosane, triacontane, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, icosanediol, pentaerythritol, neopentyl glycol, butanetetraol, mannitol, paraffin wax, erythritol, hydroquinone, methyl stearate, methyl palmitate, and benzophenone.
As a further improvement of the application, the reactant A is at least one of bisphenol A, bisphenol C, bisphenol S, bisphenol F, bisphenol AF, DBSP, D-8, acidic phosphate ester and acidic metal salt.
As a further development of the present application, the reactant B is bromothymol blue, bromocresol green, methyl yellow, methyl orange, bromocresol green, Red 500, 7- [4- (diethylamino) -2-ethoxyphenyl ] -7- (2-methyl-1-octyl-1H-indol-3-yl) furo [3,4-B ] pyridin-5 (7H) -one, 4'- [ (9-butyl-9H-carbazol-3-yl) methylene ] bis [ N-methyl-N-phenylaniline ], 2' - (dibenzylamino) -6'- (diethylamino) fluoran, 3-bis (N-octyl-2-methylindole) phthalide, methyl orange, bromocresol green, Red 500, 7- [4- (diethylamino) -2-ethoxyphenyl ] -7- (2-methyl-1H-indol-3-yl) furo [3,4-B ] pyridin-5 (7H) -one, 4' - [ (9-butyl-9H-carbazol-3-yl) methylene ] bis [ N-methyl-N-phenyl ] -aniline ], 2'- (dibenzylamino) -6' - (diethylamino) fluoran, 3-bis (N-octyl-methylindole) phthalide, B, methyl-phenyl-lactone, and a mixture of the corresponding, 2-phenylamino-3-methyl-6-diethylfluoran, 2-phenylamino-3-methyl-6-dibutylfluoran, 6-dimethylamino-3, 3-bis (4-dimethylaminophenyl) phthalide, 10-benzoyl-3, 7-bis (dimethylamino) phenothiazine, 3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide, 1, 3-dimethyl-6-diethylaminofluoran, 2 '-chloro-6' - (diethylamino) fluoran, 6- (N-ethyl-4-methylanilino) -2-methylfluoran, 3- (N-ethyl-4-methylanilino) -6-methyl-7-anilinofluoran, 3',6' -dimethoxyfluorane, 1, 2-benzo-6-diethylaminofluorane, 3- (1, 2-dimethyl-3-indolyl) -3- [ 4-diethylamino-2-methylphenyl ] phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-aza-2-benzo [ C ] furanone, 6' - (diethylamino) -1',2' -benzofluorane, 2- (2',4' -dimethylphenylamino-3-methyl-6-diethylaminofluorane), N-dimethyl-4- (2- (2- (octyloxy) phenyl) -6 -phenylpyridin-4-yl) aniline, 3- (4-dimethylaminophenyl) -3- (1-butyl-2-methyl-indol-3-yl) -6-dimethylaminophthalide, 3-N-isopentyl-N-ethylamino-6-methyl-7-phenylaminofluoran.
As a further development of the application, the temperature indicating device further comprises a protective layer arranged outside the functional layer.
As a further improvement of the present application, the protective layer is a transparent protective film.
In order to achieve the above object, the present application further provides a method for manufacturing the temperature indicating device, including the following steps: s1, grafting reaction: grafting hydrogel on the porous hollow microspheres to obtain hydrogel grafted porous hollow microspheres; s2, soaking the hydrogel grafted porous hollow microsphere in the step S1 in a phase change solvent containing a reactant A, reducing the temperature after sufficient soaking to solidify the phase change solvent filled in the hydrogel grafted porous hollow microsphere, taking out and removing the phase change solvent remaining on the surface, and then placing the hydrogel grafted porous hollow microsphere in water to enable the hydrogel grafted on the porous hollow microsphere to absorb water to expand and block the holes of the porous hollow microsphere, so that the porous hollow microsphere filled with the phase change solvent containing the reactant A is obtained; s3, preparation of a functional layer: and fully mixing the reactant B and the sol to obtain a first sol mixture, fully and uniformly mixing the porous hollow microspheres filled with the phase change solvent containing the reactant A in the holes in the step S2 with the first sol mixture to obtain a second sol mixture, and coating the second sol mixture on the substrate to form the functional layer.
As a further development of the application, a protective layer is provided to the outside of the functional layer.
The temperature indicating device has the advantages that the structural design of the grafted porous hollow microspheres is utilized, the hydrogel grafted onto the porous hollow microspheres blocks the phase change solvent containing the reactant A into the porous hollow microspheres, and the reactant B is isolated to the outside of the porous hollow microspheres. When the indicating device is at the temperature above the volume phase transition temperature of the hydrogel, the hydrogel shrinks in volume, the pore channels of the porous hollow microspheres are shown, and the phase-change solvent melts and permeates to the outside of the porous hollow microspheres to enable the reactant A and the reactant B to react and develop color. Thereby indicating the product temperature. The structural design can simultaneously prepare the reactant A and the reactant B which play a role in temperature indication color development into the same layer of the temperature indication device, compared with the traditional multilayer structural design, the temperature indication device is simple, the indicating device is thinner and small in size, the reactant A and the reactant B are more easily subjected to combined reaction to develop color, and the temperature indication sensitivity is high.
Drawings
FIG. 1 is a schematic view of the overall structure of a temperature indicating device;
in the figure: 1. a base layer; 2. a functional layer; 3. and a protective layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the following description of the present application will be made in detail and completely with reference to the specific embodiments and the accompanying drawings. It should be understood that the described embodiments are only a few embodiments of the present application, not all embodiments, and are not intended to limit the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to solve the problem of monitoring cumulative heat exposure and specific threshold temperature of products in some special industries, the application provides a temperature indicating device, as shown in fig. 1, comprising a base layer 1 and a functional layer 2 arranged on the base layer 1 and used for indicating temperature, wherein the functional layer 2 comprises a plurality of porous hollow microspheres grafted with hydrogel, a phase change solvent containing a reactant A, a reactant B and a sol for fixing the reactant B, when the temperature indicating device is placed in a temperature environment lower than the volume phase transition temperature of the hydrogel, the hydrogel blocks the phase change solvent into the interiors of the porous hollow microspheres, the hydrogel isolates the reactant B from the exteriors of the porous hollow microspheres, when the temperature indicating device is placed in a temperature environment above the volume phase transition temperature of the hydrogel, the hydrogel shrinks in volume, and (3) displaying the pore channel of the porous hollow microsphere, wherein the phase-change solvent is melted and permeates to the outside of the porous hollow microsphere so as to react and develop the color of the reactant A and the reactant B. Thereby indicating the product temperature. When the temperature indicating device develops color, the response temperature of the temperature indicating device can be judged, the temperature of the product is further indicated, and when the response temperature of the general temperature indicating device appears, the ambient temperature of the product is not lower than the response temperature.
The temperature indicating device of this application has utilized the hole structural design of porous hollow microsphere and has the characteristics that volume phase transition was had to grafting aquogel when specific temperature, will play the reactant A and the reactant B of chromogenic reaction and prepare simultaneously to indicating device's the same layer, and the indicating device simple structure of more traditional multilayer structural design, and reactant A and reactant B take place more easily to combine the reaction and the colour development, and temperature indication sensitivity is high.
In the present application, as a preferred embodiment, the wall material of the porous hollow microspheres is not limited to at least one selected from the group consisting of polystyrene, polyaryletherketone, polyetheretherketone, polyaramid, polyimide, polyethylene, polystyrene-polyvinylaniline hydrochloride copolymer, polystyrene-divinylbenzene copolymer, polylactic acid-glycolic acid copolymer, polymethyl methacrylate, glycidyl methacrylate-ethylene dimethacrylate copolymer, and PVA.
In the present application, the grafted hydrogel has a volume phase transition characteristic at a specific temperature, namely: when the grafted hydrogel is lower than the volume phase transition temperature, the volume of the grafted hydrogel is in an expanded state, and the hydrogel in the expanded state can completely cover the holes of the porous hollow microspheres; when the grafted hydrogel is higher than the volume phase transition temperature, the volume of the grafted hydrogel is in a shrinkage state, and the hydrogel after the volume shrinkage can expose part or all of the holes of the porous hollow microspheres. As a preferred embodiment, the hydrogel may be, but is not limited to, at least one of poly (N-isopropylacrylamide), chitosan, polyacrylamide, cellulose derivatives, polyoxyethylene, polyoxypropylene, polylactic acid, polyethylene glycol, poly (e-caprolactone-glycolide), poly (e-caprolactone-p-dioxanone), polyester, poly (2-methyl-2-propenoic acid-2- (2-methoxyethoxy) ethyl ester-co-OEGMA), polyhydroxyethylmethacrylate. In the present application, as a preferred embodiment, the content of the hydrogel by mass is not more than 20% of the porous hollow microspheres. Further preferably, the mass percentage of the hydrogel is not more than 10% of the mass percentage of the porous hollow microspheres. Further preferably, the mass percentage of the hydrogel is not more than 5% of the mass percentage of the porous hollow microspheres.
In the present application, as a preferred embodiment, the phase change solvent may be, but is not limited to, at least one of tetradecane, pentadecane, hexadecane, heptadecane, octadecane, eicosane, docosane, tetracosane, triacontane, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, behenyl alcohol, pentaerythritol, neopentyl glycol, erythritol, mannitol, paraffin wax, erythritol, hydroquinone, methyl stearate, methyl palmitate, and benzophenone.
In the present application, as a preferred embodiment, the reactant a may be, but is not limited to, at least one of bisphenol a, bisphenol C, bisphenol S, bisphenol F, bisphenol AF, DBSP, D-8, acidic phosphate ester, and acidic metal salt.
As a preferred embodiment herein, the reactant B may be, but is not limited to, bromothymol blue, bromocresol green, methyl yellow, methyl orange, bromocresol green, Red 500, 7- [4- (diethylamino) -2-ethoxyphenyl ] -7- (2-methyl-1-octyl-1H-indol-3-yl) furo [3,4-B ] pyridin-5 (7H) -one, 4' - [ (9-butyl-9H-carbazol-3-yl) methylene ] bis [ N-methyl-N-phenylaniline ], 2' - (dibenzylamino) -6' - (diethylamino) fluoran, 3-bis (N-octyl-2-methylindole) phthalide, 2-phenylamino-3-methyl-6-diethylfluoran, 2-phenylamino-3-methyl-6-dibutylfluoran, 6-dimethylamino-3, 3-bis (4-dimethylaminophenyl) phthalide, 10-benzoyl-3, 7-bis (dimethylamino) phenothiazine, 3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide, 1, 3-dimethyl-6-diethylaminofluoran, 2 '-chloro-6' - (diethylamino) fluoran, 6- (N-ethyl-4-methylanilino) -2-methylfluoran, 3- (N-ethyl-4-methylanilino) -6-methyl-7-anilinofluoran, 3',6' -dimethoxyfluorane, 1, 2-benzo-6-diethylaminofluorane, 3- (1, 2-dimethyl-3-indolyl) -3- [ 4-diethylamino-2-methylphenyl ] phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-aza-2-benzo [ C ] furanone, 6' - (diethylamino) -1',2' -benzofluorane, 2- (2',4' -dimethylphenylamino-3-methyl-6-diethylaminofluorane), N-dimethyl-4- (2- (2- (octyloxy) phenyl) -6 -phenylpyridin-4-yl) aniline, 3- (4-dimethylaminophenyl) -3- (1-butyl-2-methyl-indol-3-yl) -6-dimethylaminophthalide, 3-N-isopentyl-N-ethylamino-6-methyl-7-phenylaminofluoran.
In the present application, as a preferred embodiment, the temperature indicating device further comprises a protective layer 3 disposed outside the functional layer 2, as shown in fig. 1. Preferably, the protective layer 3 is a transparent protective film, which facilitates observation of color change of the temperature indicating device.
In order to achieve the above object, the present application further provides a method for manufacturing a temperature indicating device, which is applied to the temperature indicating device, and includes the following steps: s1, grafting reaction: grafting hydrogel on the porous hollow microspheres to obtain hydrogel grafted porous hollow microspheres; s2, soaking the hydrogel grafted porous hollow microsphere in the step S1 in a phase change solvent containing a reactant A, reducing the temperature after sufficient soaking to solidify the phase change solvent filled in the hydrogel grafted porous hollow microsphere, taking out and removing the phase change solvent remaining on the surface, and then placing the hydrogel grafted porous hollow microsphere in water to enable the hydrogel grafted on the porous hollow microsphere to absorb water to expand and block the holes of the porous hollow microsphere, so that the porous hollow microsphere filled with the phase change solvent containing the reactant A is obtained; s3, preparation of the functional layer 2: and fully mixing the reactant B and the sol to obtain a first sol mixture, fully and uniformly mixing the porous hollow microspheres filled with the phase change solvent containing the reactant A in the holes in the step S2 with the first sol mixture to obtain a second sol mixture, and coating the second sol mixture on the base layer 1 to form the functional layer.
In the present application, as a preferred embodiment, a protective layer 3 is provided outside the functional layer 2 for protecting the functional layer 2. Preferably, the protective layer 3 is a transparent protective film for facilitating observation of the color change of the temperature indicating device.
In order to verify that the technical scheme of the application has excellent technical effect, the application also provides 2 groups of embodiments for evidence.
Example 1
In the temperature indicating device prepared in this example, the wall material of the porous hollow microsphere is polystyrene; the hydrogel grafted to the porous hollow microspheres is poly (N-isopropylacrylamide), and the volume phase transition temperature of the hydrogel is 32 ℃; the phase change solvent is a mixed solvent of tetradecanol and decanol, and the mass percentage of the tetradecanol to the decanol is 20: 1; the reactant A dissolved in the phase-change solvent is gallic acid, the mass percentage of the gallic acid to the phase-change solvent is 1%, and the melting point of the phase-change solvent containing the reactant A is about 32 ℃; the reactant B is haematochrome-16.
When the temperature indicating device of the embodiment is in an environment lower than 32 ℃, the phase-change solvent is solid, and the hydrogel expands to block the hole; when the temperature indicating device of the embodiment is located in an environment higher than 32 ℃, the phase-change solvent is melted while the hydrogel is shrunk, the pores are revealed, the phase-change solvent is diffused to the outside of the microspheres, and the gallic acid and the haematochrome-16 are red after reaction, obviously, 32 ℃ is the corresponding temperature of the embodiment, and the critical point of the environment temperature higher than 32 ℃ can be simply and conveniently monitored by the temperature indicating device of the embodiment.
Example 2
In the temperature indicating device prepared in this example, the wall material of the porous hollow microspheres is polystyrene-divinylbenzene copolymer; the hydrogel grafted to the porous hollow microspheres is 2-methyl-2-acrylic acid-2- (2-methoxyethoxy) ethyl ester and OEGMA copolymer, the mass percentage contents are 61.3 percent and 38.7 percent respectively, and the volume phase transition temperature of the hydrogel is 38 ℃; the phase-change solvent is tetradecanol, the reactant A dissolved in the phase-change solvent is bisphenol F, the mass percent of the bisphenol F to the phase-change solvent is 0.5%, and the melting point of the phase-change solvent containing the reactant A is about 38 ℃; reactant B was selected to be dark blue BL-63.
When the temperature indicating device of the embodiment is in an environment of lower than 38 ℃, the phase-change solvent is solid, and the hydrogel expands to block the hole; when the temperature indicating device of the embodiment is located in an environment higher than 38 ℃, the phase-change solvent is melted while the hydrogel shrinks, the holes appear, the phase-change solvent diffuses to the exterior of the microspheres, and the bisphenol F and the dark blue BL-63 are blue after reaction, obviously, 38 ℃ is the corresponding temperature of the embodiment, and the temperature indicating device of the embodiment can simply and conveniently monitor the critical point that the environmental temperature is higher than 38 ℃.
To sum up, the present application provides a temperature indicating device, this temperature indicating device has utilized the structural design of the porous hollow microsphere of grafting aquogel, works as temperature indicating device arranges in and is less than when the volume phase transition temperature environment of aquogel, aquogel will contain reactant A the phase change solvent blocks to the inside of porous hollow microsphere, aquogel will reactant B keeps apart to the outside of porous hollow microsphere, works as temperature indicating device arranges in when the temperature environment more than the volume phase transition temperature of aquogel, aquogel volume shrink, the pore of porous hollow microsphere shows, the phase change solvent melts and permeates to porous hollow microsphere outside makes reactant A with reactant B reacts and the color development.
This kind of structural design can prepare reactant A and reactant B who plays the temperature indication chromogenic reaction simultaneously to temperature indicating device's the same layer, and the indicating device of more traditional multilayer structural design simple structure, small, portable, and reactant A and reactant B take place to combine the reaction more easily and the colour development, and temperature indication sensitivity is high. The method can be applied to various temperature monitoring scenes.
Although the description is given in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art will recognize that the embodiments described herein may be combined as a whole to form other embodiments as would be understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (14)
1. The temperature indicating device is characterized by comprising a base layer and a functional layer arranged on the base layer and used for indicating temperature, wherein the functional layer comprises a plurality of porous hollow microspheres grafted with hydrogel, a phase-change solvent containing a reactant A, a reactant B and sol for fixing the reactant B; when the temperature indicating device is placed in an environment below the volume phase transition temperature of the hydrogel, the hydrogel blocks the phase change solvent into the interior of the porous hollow microspheres and isolates the reactant B from the exterior of the porous hollow microspheres, when the temperature indicating device is placed in an environment above the volume phase transition temperature of the hydrogel, the hydrogel shrinks in volume, the pore channels of the porous hollow microspheres are shown, and the phase change solvent melts and permeates into the exterior of the porous hollow microspheres to react and develop the reactant A and the reactant B, so that the temperature of a product is indicated.
2. The temperature-indicating apparatus of claim 1, wherein the phase change solvent has a solid-to-liquid phase transition temperature not greater than a volume phase transition temperature of the hydrogel, and wherein the temperature-indicating apparatus has a response temperature that is the volume phase transition temperature of the hydrogel.
3. The temperature indicating device of claim 1, wherein the wall material of the porous hollow microspheres is selected from at least one of polystyrene, polyaryletherketone, polyetheretherketone, polyaramid, polyimide, polyethylene, polystyrene-polyvinylaniline hydrochloride copolymer, polystyrene-divinylbenzene copolymer, polylactic acid-glycolic acid copolymer, polymethyl methacrylate, glycidyl methacrylate-ethylene dimethacrylate copolymer, and PVA.
4. The temperature-indicating device of claim 1, wherein the hydrogel is at least one of poly (N-isopropylacrylamide), chitosan, polyacrylamide, a cellulose derivative, polyethylene oxide, polypropylene oxide, polylactic acid, polyethylene glycol, poly (e-caprolactone-glycolide), poly (e-caprolactone-p-dioxanone), polyester, poly (2-methyl-2-propenoic acid-2- (2-methoxyethoxy) ethyl ester-co-OEGMA), polyhydroxyethylmethacrylate.
5. The temperature indicating device of claim 1, wherein the hydrogel comprises no more than 20% by weight of the porous hollow microspheres.
6. The temperature indicating device of claim 5, wherein the hydrogel comprises no more than 10% by weight of the porous hollow microspheres.
7. The temperature indicating device of claim 6, wherein the hydrogel comprises no more than 5% by weight of the porous hollow microspheres.
8. The temperature indicating device of claim 1, wherein the phase change solvent is at least one of tetradecane, pentadecane, hexadecane, heptadecane, octadecane, eicosane, docosane, tetracosane, triacontane, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, decanol, dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, behenyl alcohol, pentaerythritol, neopentyl glycol, erythritol, mannitol, paraffin wax, erythritol, hydroquinone, methyl stearate, methyl palmitate, and benzophenone.
9. The temperature indicating device of claim 1, wherein the reactant a is at least one of bisphenol a, bisphenol C, bisphenol S, bisphenol F, bisphenol AF, DBSP color developer, D-8 color developer, TGSH color developer, acidic phosphate ester and modified resin thereof, acidic metal salt.
10. The temperature indicating device of claim 1, wherein reactant B is bromothymol blue, bromocresol green, methyl yellow, methyl orange, bromocresol green, Red 500, 7- [4- (diethylamino) -2-ethoxyphenyl ] -7- (2-methyl-1-octyl-1H-indol-3-yl) furo [3,4-B ] pyridin-5 (7H) -one, 4' - [ (9-butyl-9H-carbazol-3-yl) methylene ] bis [ N-methyl-N-phenylaniline ], 2' - (dibenzylamino) -6' - (diethylamino) fluoran, 3-bis (N-octyl-2-methylindole) phthalide, 2-phenylamino-3-methyl-6-diethylfluoran, 2-phenylamino-3-methyl-6-dibutylfluoran, 6-dimethylamino-3, 3-bis (4-dimethylaminophenyl) phthalide, 10-benzoyl-3, 7-bis (dimethylamino) phenothiazine, 3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide, 1, 3-dimethyl-6-diethylaminofluoran, 2 '-chloro-6' - (diethylamino) fluoran, 6- (N-ethyl-4-methylanilino) -2-methylfluoran, 3- (N-ethyl-4-methylanilino) -6-methyl-7-anilinofluoran, 3',6' -dimethoxyfluorane, 1, 2-benzo-6-diethylaminofluorane, 3- (1, 2-dimethyl-3-indolyl) -3- [ 4-diethylamino-2-methylphenyl ] phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-aza-2-benzo [ C ] furanone, 6' - (diethylamino) -1',2' -benzofluorane, 2- (2',4' -dimethylphenylamino-3-methyl-6-diethylaminofluorane), N-dimethyl-4- (2- (2- (octyloxy) phenyl) -6 -phenylpyridin-4-yl) aniline, 3- (4-dimethylaminophenyl) -3- (1-butyl-2-methyl-indol-3-yl) -6-dimethylaminophthalide, 3-N-isopentyl-N-ethylamino-6-methyl-7-phenylaminofluoran.
11. The temperature indicating device of claim 1, further comprising a protective layer disposed outside the functional layer.
12. The temperature indicating device of claim 11, wherein the protective layer is a transparent protective film.
13. A method of manufacturing a temperature indicating device according to any one of claims 1 to 12, comprising the steps of:
s1, grafting reaction: grafting hydrogel on the porous hollow microspheres to obtain hydrogel grafted porous hollow microspheres;
s2, soaking the hydrogel grafted porous hollow microsphere in the step S1 in a phase change solvent containing a reactant A, reducing the temperature after sufficient soaking to solidify the phase change solvent filled in the hydrogel grafted porous hollow microsphere, taking out and removing the phase change solvent remaining on the surface, and then placing the hydrogel grafted porous hollow microsphere in water to enable the hydrogel grafted on the porous hollow microsphere to absorb water to expand and block the holes of the porous hollow microsphere, so that the porous hollow microsphere filled with the phase change solvent containing the reactant A is obtained;
s3, preparation of a functional layer: and fully mixing the reactant B and the sol to obtain a first sol mixture, fully and uniformly mixing the porous hollow microspheres filled with the phase change solvent containing the reactant A in the holes in the step S2 with the first sol mixture to obtain a second sol mixture, and coating the second sol mixture on the substrate to form the functional layer.
14. The method of manufacturing a temperature indicating device according to claim 13, wherein a protective layer is provided to the outside of the functional layer.
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| WO2023116088A1 (en) * | 2021-12-23 | 2023-06-29 | 江苏集萃智能液晶科技有限公司 | Thermochromism indicator |
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| WO2023116088A1 (en) * | 2021-12-23 | 2023-06-29 | 江苏集萃智能液晶科技有限公司 | Thermochromism indicator |
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