CN111816054A

CN111816054A - Solid-state temperature-sensitive color-changing label

Info

Publication number: CN111816054A
Application number: CN202010707055.1A
Authority: CN
Inventors: 何乐; 全跃龙; 邵一帅
Original assignee: Suzhou Shan'en Nanometer Function Material Technology Co ltd
Current assignee: Suzhou Shan'en Nanometer Function Material Technology Co ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2020-10-23

Abstract

The invention discloses a method for manufacturing a solid temperature-sensitive color-changing label. Which comprises the following steps: 1) preparing a Colloidal Crystal Array (CCA); 2) ultrasonically dispersing the colloidal crystal array prepared in the step 1) in a temperature-sensitive dispersion liquid; 3) under the condition of an external special magnetic field, the temperature-sensitive liquid film presents a pattern and gradually volatilizes water and ethanol. The label does not produce pattern change at room temperature and a temperature, and the color pattern is faded and irreversible within the range of 30-120 ℃.

Description

Solid-state temperature-sensitive color-changing label

Technical Field

The invention relates to the field of labels, in particular to a solid temperature-sensitive color-changing label.

Background

Temperature is closely related to our life, and similarly, high temperature is a double-edged sword, which is advantageous when we need high temperature under many conditions; on the contrary, when the temperature sensing is not favorable for our productive life, it is unfavorable. Therefore, it is desirable to control and monitor the temperature. There is a need for inexpensive, convenient means.

The patent can solve the above disadvantages.

The patent relates to a solid temperature-sensitive color-changing label, which can change patterns, and the patterns of the color-changing label are related to the temperature and the time of the environment. Whether the temperature meets the set standard can be distinguished by naked eyes.

Disclosure of Invention

The application aims at the defects of the existing commodity of the solid temperature-sensitive color-changing label, and proposes to design and prepare the solid temperature-sensitive color-changing label by adopting a Colloidal Crystal Array (CCA) as a core material. The structure of a Colloidal Crystal Array (CCA) is formed under special conditions, and the special structural color is presented. In a low-temperature environment, the photonic crystal structure can exist stably, and the pattern is maintained all the time. When the environmental temperature rises, the structure is destructively changed, so that the pattern is lost, the sample is put into the low-temperature environment again, the original photonic crystal structure cannot be formed again, and the pattern of the sample cannot be recovered (as shown in figure 1). Thus, the technique can achieve temperature-sensitive irreversible color indication. In addition, the performance can be adjusted by optimizing parameters of the photonic crystal such as the shape of the nano-particles, the size of the nano-particles, the surface property modification of the nano-particles, the formula of the stabilizing solution and the like, so that the photonic crystal can meet different application requirements: the solid temperature-sensitive color-changing label has the performances of different color-changing ranges (such as blue, green to red), response rates (such as seconds, minutes and hours), response intervals (such as higher than 30 ℃), and the like.

The application has the advantages that:

1. high temperature response when the ambient temperature changes for a certain time, e.g. from below 30 ℃ to above 30 ℃, the indicator material can sensitively change pattern, indicating whether the ambient temperature exceeds the set temperature.

2. High reliability: when the ambient temperature is below the indicated temperature, the pattern of the label does not change. The higher the environmental temperature is, the more the color change of the label is accelerated, and the label can be suitable for different environmental temperature changes. The pattern change of the label has a good correlation with the ambient temperature.

3. High anti-counterfeiting performance: on the one hand, under the environment above the transition point, the label pattern is irreversibly changed, and the label pattern is not recoverable when being placed in the environment below the transition point, so that whether the temperature of the environment exceeds the set standard or not can be effectively judged. On the other hand, the color generation mechanism of the label is based on a novel intelligent nano optical material, belongs to the international research frontier, has high technical threshold and is difficult to be simulated by lawless persons.

Drawings

FIG. 1 is a structural diagram of a solid temperature-sensitive color-changing label

Detailed Description

Examples

1. Preparation of FeOOH:1.623 grams of FeCl₃·6H₂O water was dissolved in 120 ml of deionized water, and the resulting solution was added to a three-necked flask, and HCl was added to adjust the pH of the reaction solution to 1.5, followed by stirring and heating to 90 ℃ for 4 hours. The particles were collected by centrifugation, washed 3 times with water and dispersed in 12 ml of water. FeOOH nano-rod particles with the sizes of 165nm long shaft and 25nm short shaft can be obtained

Modification and coating of FeOOH with silica: typically, 1 ml of PAA (7.2 mg/ml) was added to 20 ml of water and dispersed in ultrasound, and then 3 ml of FeOOH solution was dispersed therein and stirred at room temperature for 12 hours. Then, the nanorods were mobilised by a centrifuge, and the FeOOH nanorods were redispersed in 3 ml of water. Next, PAA-modified FeOOH dispersed in 3 ml of water was added to 20 ml of ethanol, followed by addition of 1 ml of ammonium hydroxide (. about.28% wt) thereto in sonication, after three minutes, 100. mu.L of tetraethyl orthosilicate (TEOS) was injected into the solution, and then 100. mu.L of tetraethyl orthosilicate was added every 30 minutes until the total TEOS amount reached 2.4 ml, resulting in nanorods with a major axis of 245nm and a minor axis of 105 nm. After 30 minutes, FeOOH @ SiO₂The nanorods were centrifuged, washed three times with ethanol and water, and dispersed in ethanol.

3. The samples were collected by centrifugation three days later and placed in a 100 ℃ oven for drying.

4. At H₂Reducing the particles in the atmosphere at 350 ℃, and then ultrasonically dispersing again in water to obtain the high-dispersity magnetic nanorod material. The impurities are removed, the concentrated solution is added with 100 mu L of CAA and PEG solution (the molecular weight of PEG is 4k, the mass ratio of PEG to ETOH to water is 2:1:1) to be mixed, then the mixture is dripped on a film and dried by a magnetic field, a sample on the film has the color of photonic crystals, and then the sample is placed in an oven at 105 ℃ for 5 minutes, and the color gradually disappears.

Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the insubstantial modifications and adaptations made by those skilled in the art according to the above descriptions of the present invention are within the scope of the present invention.

Claims

1. A solid-state temperature-sensitive color-changing label is characterized in that: the tag is made of a Colloidal Crystal Array (CCA).

2. A Colloidal Crystal Array (CCA) according to claim 1, wherein: the composition of the Colloidal Crystal Array (CCA) is as follows:

1) a Colloidal Crystal Array (CCA) accounting for 30-60% by mass,

2) the mass fraction of the polyethylene glycol is 40-70%.

3. The preparation method of the solid temperature-sensitive color-changing label according to claim 1, wherein the preparation method comprises the following steps:

1) preparing a Colloidal Crystal Array (CCA);

2) ultrasonically dispersing the colloidal crystal array prepared in the step 1) in a temperature-sensitive dispersion liquid;

3) under the condition of an external special magnetic field, the temperature-sensitive liquid film presents a pattern and gradually volatilizes water and ethanol.

4. The solid temperature-sensitive color-changing label according to claim 1, wherein: the molecular weight of the polyethylene glycol is 200, 300, 400, 600, 800, 1000, 1500, 2000, 4000, 6000, 8000, 10000 or 20000.