CN114535030A - Temperature indicating film and preparation method thereof - Google Patents

Temperature indicating film and preparation method thereof Download PDF

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Publication number
CN114535030A
CN114535030A CN202210180913.0A CN202210180913A CN114535030A CN 114535030 A CN114535030 A CN 114535030A CN 202210180913 A CN202210180913 A CN 202210180913A CN 114535030 A CN114535030 A CN 114535030A
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temperature
film
layer
temperature indicating
indicating film
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Inventor
黄华焕
苏乐同
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Guangdong Guangyi Technology Industrial Co ltd
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Guangdong Guangyi Technology Industrial Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention relates to the technical field of packaging films, in particular to a temperature indicating film and a preparation method thereof. The temperature indicating film includes: a base layer; a temperature indicator layer compounded on the base layer; a heat sealing layer compounded on the temperature indicator layer; the temperature indicator layer is prepared from the following raw materials: 0.1 to 0.8 weight percent of temperature sensing agent; 0.1 wt% -1 wt% of inert color developing agent; 0.3 to 2 weight percent of thickening agent; 0.2 wt% -2 wt% of adhesive; 94.2 to 99.3 weight percent of solvent; the sum of the using amount of each component is 100 percent; the solvent comprises ethanol. The temperature indicating film provided by the invention displays different colors at different temperatures, has uniform color and no pigment flocculation or agglomeration, does not need instrument detection, and can visually judge the corresponding temperature range by observing the color change of the temperature indicating film.

Description

Temperature indicating film and preparation method thereof
Technical Field
The invention relates to the technical field of packaging films, in particular to a temperature indicating film and a preparation method thereof.
Background
At present, a plurality of foods, living goods and industrial goods are packaged into products by packaging films, and the packaging films have no temperature indicating function, so that the environment or scene needing temperature limitation is inconvenient to produce and use, and the production efficiency and the product quality are limited.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a temperature indicating membrane and a preparation method thereof, wherein the temperature indicating membrane provided by the present invention shows different colors at different temperatures, has uniform color and no pigment flocculation or agglomeration, and can visually determine the corresponding temperature range without instrument detection.
The present invention provides a temperature indicating film comprising:
a base layer;
a temperature indicator layer compounded on the base layer;
a heat-sealing layer compounded on the temperature indicator layer;
the temperature indicator layer is prepared from the following raw materials:
Figure BDA0003520811380000011
the sum of the using amount of the components is 100 percent;
the solvent comprises ethanol.
Preferably, the solvent includes ethanol and at least one of water and ethyl acetate.
Preferably, the solvent comprises ethanol and water;
the mass ratio of the ethanol to the water is 10-30: 70-85.
Preferably, the thickener comprises at least one of modified starch, pectin, sodium polyacrylate, polyacrylate and chitosan;
the binder includes at least one of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl cellulose, and methyl cellulose.
Preferably, the base layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper or non-woven fabric;
the heat-sealing layer comprises a PE film or a CPP film.
Preferably, the thickness of the temperature indicator layer is 1-10 μm.
Preferably, the temperature indicating film further comprises an intermediate layer;
the intermediate layer is compounded on the temperature indicator layer;
the heat sealing layer is compounded on the middle layer.
Preferably, the intermediate layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper or a nonwoven fabric.
The invention also provides a preparation method of the temperature indicating film, which comprises the following steps:
A) printing or coating a temperature indicator on the base layer;
B) compounding a heat sealing layer on the temperature indicator by adopting a hot pressing method, and cooling after air drying;
C) and cutting to obtain the temperature indicating film.
Preferably, said air-drying comprises: and drying by adopting hot air at the temperature of 80-90 ℃.
The present invention provides a temperature indicating film comprising: a base layer; a temperature indicator layer compounded on the base layer; a heat-sealing layer compounded on the temperature indicator layer; the temperature indicator layer is prepared from the following raw materials: 0.1 to 0.8 weight percent of temperature sensing agent; 0.1 wt% -1 wt% of inert color developing agent; 0.3 to 2 weight percent of thickening agent; 0.2 wt% -2 wt% of adhesive; 94.2 wt% -99.3 wt%; the sum of the using amount of the components is 100 percent; the solvent comprises ethanol. The temperature indicating film provided by the invention displays different colors at different temperatures, has uniform color and no pigment flocculation or agglomeration, does not need instrument detection, and can visually judge the corresponding temperature range by observing the color change of the temperature indicating film. Great convenience is provided for production operation and product use in a specific scene.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
The present invention provides a temperature indicating film comprising:
a base layer;
a temperature indicator layer compounded on the base layer;
and the heat sealing layer is compounded on the temperature indicator layer.
In certain embodiments of the present invention, the base layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper, or a nonwoven fabric. The thickness of the base layer is 12-70 mu m. In certain embodiments of the present invention, the thickness of the OPP film, the BOPP film, the PET film or the BOPA film is 12-20 μm. In some embodiments of the present invention, the thickness of the paper or the nonwoven fabric is 30 to 70 μm. In certain embodiments of the present invention, the base layer has a thickness of 12 μm. In certain embodiments of the present invention, the substrate is provided with air-permeable micropores, and the air permeability is 8mL/cm at 0.045MPa2.s。
In the invention, the temperature indicator layer is prepared from the following raw materials:
Figure BDA0003520811380000031
the sum of the using amount of the components is 100 percent;
the solvent comprises ethanol.
The present invention is not particularly limited in kind and source of the thickener, and a commonly available thickener can be used.
In certain embodiments of the invention, the temperature sensing agent is present in an amount of 0.6 wt%, 0.5 wt%, or 0.7 wt%. In certain embodiments of the present invention, the warming agent is selected from a red warming agent or a cyan warming agent, available from Jinhuajin technologies, Inc.
In certain embodiments of the invention, the inert developer is present in an amount of 0.4 wt%, 0.2 wt%, or 0.3 wt%. In certain embodiments of the present invention, the inert color developer is selected from a blue inert color developer or a yellow inert color developer. The blue inert color-developing agent can be an indigo inert color-developing agent or a brilliant blue inert color-developing agent, the yellow inert color-developing agent can be a lemon yellow inert color-developing agent or a sunset yellow inert color-developing agent, and the manufacturer is Tianjin synthetic dye research institute Co.
In certain embodiments of the present invention, the temperature sensitive agent is a red temperature sensitive agent and the inert color developer is a blue inert color developer or a yellow inert color developer.
In certain embodiments of the present invention, the temperature sensitive agent is a cyan temperature sensitive agent and the inert color developer is a yellow inert color developer.
In certain embodiments of the invention, the thickener is present in an amount of 1 wt%, 1.2 wt%, or 0.9 wt%.
In certain embodiments of the present invention, the thickening agent comprises at least one of modified starch, pectin, sodium polyacrylate, and chitosan.
In certain embodiments of the invention, the binder is present in an amount of 1.5 wt%, 1.6 wt%, or 1.3 wt%.
In certain embodiments of the present invention, the binder comprises at least one of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl cellulose, and methyl cellulose.
In certain embodiments of the invention, the solvent is present in an amount of 96.5 wt% or 96.8 wt%.
In certain embodiments of the present invention, the solvent comprises ethanol and at least one of water and ethyl acetate. In certain embodiments, the solvent comprises water and ethanol; the mass ratio of the ethanol to the water is 10-30: 70-85. In certain embodiments of the invention, the mass ratio of ethanol to water is 20: 76.5, 22: 74.5 or 24: 72.8.
in some embodiments of the present invention, the thickness of the temperature indicator layer is 1 to 10 μm.
In certain embodiments of the present invention, the heat seal layer comprises a PE film or a CPP film. The thickness of the heat sealing layer is 20-30 mu m. In certain embodiments of the present invention, the heat-seal layer has a thickness of 25 μm.
In some embodiments of the present invention, the heat-sealing layer has air-permeable micropores, and the air permeability is 8mL/cm under the condition of 0.045MPa2.s。
In certain embodiments of the present invention, the temperature indicating film further comprises an intermediate layer;
the intermediate layer is compounded on the temperature indicator layer;
the heat sealing layer is compounded on the middle layer.
In certain embodiments of the invention, the intermediate layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper or a nonwoven fabric. The thickness of the middle layer is 12-70 mu m. In certain embodiments of the present invention, the thickness of the OPP film, the BOPP film, the PET film or the BOPA film is 12-20 μm. In some embodiments of the present invention, the thickness of the paper or the nonwoven fabric is 30 to 70 μm. In certain embodiments of the invention, the thickness of the intermediate layer is 60 μm or 70 μm.
The invention also provides a preparation method of the temperature indicating film, which comprises the following steps:
A) printing or coating a temperature indicator on the base layer;
B) compounding a heat sealing layer on the temperature indicator by adopting a hot pressing method, and cooling after air drying;
C) and cutting to obtain the temperature indicating film.
The raw material components and contents adopted in the preparation method of the temperature indicating film are the same as above, and are not described again here.
In some embodiments of the present invention, the temperature indicator is prepared by uniformly mixing the raw materials for preparing the temperature indicator layer.
In certain embodiments of the invention, step B) comprises:
and compounding an intermediate layer on the temperature indicator, compounding a heat sealing layer on the intermediate layer by adopting a hot pressing method, and cooling after air drying.
In certain embodiments of the invention, the intermediate layer is compounded over the temperature indicator using an adhesive comprising an acrylic latex, EVA latex, or a phenolic resin adhesive.
In certain embodiments of the invention, the air drying comprises: and drying by adopting hot air at the temperature of 80-90 ℃.
The method of slitting is not particularly limited in the present invention, and a slitting method known to those skilled in the art may be employed.
In some embodiments of the present invention, after the slitting, the method further comprises: and (6) rolling.
In order to further illustrate the present invention, a temperature indicating film and a method for manufacturing the same according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
A temperature indicating film comprising:
base layer (PET film, 12 μm, with air permeability of 8mL/cm under 0.045MPa2.s；
A temperature indicator layer compounded on the base layer;
an intermediate layer (paper, 60 μm) laminated on the temperature indicator layer;
a heat-sealing layer (PE film, 25 μm, with air-permeable micropores, air permeability of 8mL/cm under 0.045 MPa) compounded on the intermediate layer2.s。
The temperature indicator layer is prepared from the following raw materials:
Figure BDA0003520811380000051
Figure BDA0003520811380000061
the thickening agent is selected from pectin, and the adhesive is selected from carboxymethyl cellulose;
the temperature indicator is obtained by uniformly mixing raw materials of the temperature indicator layer.
The preparation method of the temperature indicating film comprises the following steps:
1) printing a temperature indicator on the base layer;
2) compounding an intermediate layer on the temperature indicator by adopting acrylic latex;
3) compounding a heat sealing layer on the middle layer by adopting a hot pressing method, drying by adopting hot air at the temperature of 80-90 ℃, and cooling;
4) and cutting to obtain the temperature indicating film.
The detection shows that the temperature indicating film shows red at 0-10 ℃, purple at 10-20 ℃, purple at 30-40 ℃, bluish purple at 40-50 ℃, blue at 50-60 ℃, uniform color and no pigment flocculation or agglomeration.
The air permeability of the temperature indicating film under the condition of 0.045MPa is 8mL/cm2.s。
The temperature indicating film prepared in example 1 has temperature indicating and ventilating functions and can be used in the production of deoxidizers for food.
Because there is a time of air-out in the production or use of the deoxidizer, the deoxidizer will react and generate heat when the air-out is empty, the higher the heating temperature is, the more rapid the performance loss of the deoxidizer is, and the heating temperature is controlled within 50 ℃ when the deoxidizer is produced or used. The temperature indicating film is adopted for packaging, the temperature range of a product can be visually known by observing the color change of the temperature indicating film, and a corresponding operation process can be implemented according to the temperature range. If the deoxidizer is produced, the temperature indicating film shows bluish purple, which indicates that the product is sealed as soon as possible, and avoids the product performance from increasing and losing; if the temperature indicating film shows blue color, which indicates that the deoxidizer has large loss, the product needs to be isolated and evaluated whether the performance of the product meets the use requirement.
Example 2
A temperature indicating film comprising:
base layer (PET film, 12 μm);
a temperature indicator layer compounded on the base layer;
a heat-seal layer (PE film, 25 μm) compounded on the temperature indicator layer.
The temperature indicator layer is prepared from the following raw materials:
Figure BDA0003520811380000071
the thickening agent is selected from polyacrylate, and the adhesive is selected from sodium carboxymethyl cellulose;
the temperature indicator is obtained by uniformly mixing raw materials of the temperature indicator layer.
The preparation method of the temperature indicating film comprises the following steps:
1) printing a temperature indicator on the base layer;
2) compounding a heat sealing layer on the temperature indicator by adopting a hot pressing method, drying by adopting hot air at the temperature of 80-90 ℃, and cooling;
3) and cutting to obtain the temperature indicating film.
The detection shows that the temperature indicating film shows cyan at-18-0 ℃, cyan at 0-10 ℃, yellow at 10-20 ℃, uniform color and no pigment flocculation or agglomeration.
The temperature indicating film prepared in example 2 has a temperature indicating function and can be used in food packaging.
In the cold chain snow skin moon cake, the temperature indicating film is adopted to package edible moon cakes, great convenience is brought, the optimal edible temperature range of the cold chain snow skin moon cake is 4-10 ℃, the snow skin moon cake is stored at-18 ℃, unfreezing needs to be taken out when the moon cake is eaten, the unfreezing process is not easy to grasp, too early eating can be hard, too late eating is soft, the taste is influenced, the experience is extremely poor, the optimal eating time can be accurately grasped by observing the color change of the coating, and when the color of the coating is changed into green yellow, the cold chain snow skin moon cake is unfrozen to the most appropriate eating point.
Example 3
A temperature indicating film comprising:
base layer (PET film, 12 μm);
a temperature indicator layer compounded on the base layer;
an intermediate layer (paper, 70 μm) composited on said temperature indicator layer;
a heat-seal layer (PE film, 25 μm) laminated on the intermediate layer.
The temperature indicator layer is prepared from the following raw materials:
Figure BDA0003520811380000072
Figure BDA0003520811380000081
the thickening agent is selected from chitosan, and the adhesive is selected from methyl cellulose;
the temperature indicator is obtained by uniformly mixing raw materials of the temperature indicator layer.
The preparation method of the temperature indicating film comprises the following steps:
1) printing a temperature indicator on the base layer;
2) compounding an intermediate layer on the temperature indicator by adopting acrylic latex;
3) compounding a heat sealing layer on the middle layer by adopting a hot pressing method, drying by adopting hot air at the temperature of 80-90 ℃, and cooling;
4) and cutting to obtain the temperature indicating film.
The detection shows that the temperature indicating film shows red at 20-30 ℃, orange at 30-40 ℃ and yellow at 40-50 ℃, has uniform color and is free of pigment flocculation and agglomeration.
The temperature indicating film prepared in example 3 has a temperature indicating function.
The temperature indicating film is attached to a high-temperature working place, the environmental temperature range can be visually judged according to the color of the film, and when the color of the film is changed into orange, cooling and sunstroke-preventing measures are required.
Comparative example 1
The ethanol in the temperature indicator layer in example 1 was replaced with dichloromethane, acetone, diethyl ether, trichloroethylene, and triethanolamine, respectively, and the remaining steps were performed as in example 1 to obtain a temperature indicating film. The results are shown in Table 1.
Table 1 results of measuring properties of temperature indicating film prepared in comparative example 1
Figure BDA0003520811380000082
Figure BDA0003520811380000091
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A temperature indicating film comprising:
a base layer;
a temperature indicator layer compounded on the base layer;
a heat-sealing layer compounded on the temperature indicator layer;
the temperature indicator layer is prepared from the following raw materials:
Figure FDA0003520811370000011
the sum of the using amount of the components is 100 percent;
the solvent comprises ethanol.
2. The temperature indicating film of claim 1, wherein the solvent comprises ethanol and at least one of water and ethyl acetate.
3. The temperature indicating film of claim 1, wherein the solvent comprises ethanol and water;
the mass ratio of the ethanol to the water is 10-30: 70-85.
4. The temperature indicating film of claim 1, wherein the thickening agent comprises at least one of modified starch, pectin, sodium polyacrylate, and chitosan;
the binder includes at least one of carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl cellulose, and methyl cellulose.
5. The temperature indicating film according to claim 1, wherein the base layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper, or a nonwoven fabric;
the heat-sealing layer comprises a PE film or a CPP film.
6. The temperature-indicating film according to claim 1, wherein the thickness of the temperature-indicating agent layer is 1 to 10 μm.
7. The temperature indicating film of claim 1, further comprising an intermediate layer;
the intermediate layer is compounded on the temperature indicator layer;
the heat sealing layer is compounded on the middle layer.
8. The temperature indicating film according to claim 1, wherein the intermediate layer comprises an OPP film, a BOPP film, a PET film, a BOPA film, paper, or a nonwoven fabric.
9. A method for preparing a temperature indicating film comprises the following steps:
A) printing or coating a temperature indicator on the base layer;
B) compounding a heat sealing layer on the temperature indicator by adopting a hot pressing method, and cooling after air drying;
C) and cutting to obtain the temperature indicating film.
10. The method of claim 9, wherein the air-drying comprises: and drying by adopting hot air at the temperature of 80-90 ℃.
CN202210180913.0A 2022-02-25 2022-02-25 Temperature indicating film and preparation method thereof Pending CN114535030A (en)

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Citations (5)

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CN113234358A (en) * 2021-06-07 2021-08-10 江苏唐彩新材料科技股份有限公司 Water-based flexo printing temperature-variable anti-counterfeiting ink and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1546316A (en) * 2003-12-15 2004-11-17 韩国皇冠电子株式会社 Heat-sealed films with functional properties
JP2006001206A (en) * 2004-06-18 2006-01-05 Dainippon Printing Co Ltd Laminate provided with indicator for heat treatment and its manufacturing method
CN104530821A (en) * 2014-12-17 2015-04-22 浙江理工大学 Quick-drying type low-temperature reversible color change water-based ink and preparation method thereof
CN105911059A (en) * 2016-06-17 2016-08-31 深圳九星印刷包装集团有限公司 Acid-sensitive color change indicating device
CN113234358A (en) * 2021-06-07 2021-08-10 江苏唐彩新材料科技股份有限公司 Water-based flexo printing temperature-variable anti-counterfeiting ink and preparation method thereof

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