TWI678143B - Temperature-dependent color-changed multilayer and thermal module including the same - Google Patents

Abstract

The invention relates to a temperature-sensitive color-changing laminate and a heat dissipation module including the same. The thermochromic laminate includes a color layer and a shielding layer. The color layer is disposed on the surface of the heat sink. The shielding layer is disposed on the color layer, and the color layer is located between the shielding layer and the heat sink. When the temperature of the shielding layer is above a specified temperature interval, the color of the color layer is exposed by the shielding layer. The heat-dissipating module that has both color changing and heat-dissipating functions includes a heat-dissipating member and a temperature-sensitive color-changing stack. When the temperature rises, the color of the heat sink changes and can be directly observed visually.

Description

Temperature-sensitive color-changing laminate and heat dissipation module containing same

The invention relates to a laminate and a heat dissipation module including the same. In particular, it relates to a thermochromic laminate and a heat dissipation module including the same.

With the advancement of science and technology, many electronic mechanical products have been developed. During the operation of these electronic products, a large amount of heat is generated or accumulated. Failure to dissipate heat in a timely manner may affect the normal operation of electronic products, reduce their lifespan and even cause damage. Therefore, in order to maintain the normal operation of electronic products, a heat sink module needs to be installed. The heat dissipation module usually includes a heat pipe, a heat sink and a fan. The material of the heat sink is generally metal, and its appearance is mostly metallic. Nowadays, with the emphasis on aesthetics, many products with various appearances have been developed, such as transparent cases or cases with heat dissipation functions. Therefore, in order to make the heat sink have various colors, different colors of paint are sprayed on the surface.

Generally, the heat sink is a metallic material, so its appearance is mostly metallic. There are also some heat sinks that are painted in other colors for aesthetic considerations when used with transparent shells. However, the color of these heat sinks is a single color that cannot be changed with temperature and is slightly monotonous. In addition, these heat sinks cannot provide temperature information to the user by observing its appearance in a non-direct contact manner, and need to provide temperature information to the user through direct contact methods, such as thermocouple contact methods.

The invention provides a temperature-sensitive color-changing stack and can be applied to a heat-dissipating member in a heat-dissipating module, so that it becomes a temperature-sensitive color-changing heat-dissipating module. This solves the problem that the general heat sink module is slightly monotonous in appearance and requires a thermocouple contact to know its temperature.

A thermochromic laminate according to an embodiment of the present invention is disposed on a surface of a heat-generating component or a heat-radiating component. The thermochromic laminate includes a color layer and a shielding layer. The color layer is disposed on the surface of the heating element or the heat dissipation element. The shielding layer is disposed on the color layer, and the color layer is located between the shielding layer and the heating element or the heat dissipating element. When the temperature of the shielding layer is above a specified temperature interval, the shielding layer reveals the color of the color layer.

A heat sink module according to an embodiment of the present invention includes a heat sink and the temperature-sensitive color-changing stack of the foregoing embodiment. The thermochromic laminate is disposed on the surface of the heat sink.

An embodiment of the present invention provides a temperature-sensitive color-changing laminate and a heat dissipation module including the same. When the temperature of the shielding layer rises above a specified temperature interval, the shielding layer reveals the color of the color layer. Therefore, the temperature-sensitive color-changing stack on the surface of the heat sink of the present invention will produce a color change. Compared with common single-color heat sinks, the heat sink module of the embodiment of the present invention can have more abundant changes in appearance, which is more in line with modern aesthetic requirements. In addition, the user can also know the temperature of the heating element (such as CPU or chip) through the color change of the thermochromic stack, so that the user can more quickly understand the temperature range of the heat dissipation element and the heating element without going through The direct contact method of the thermocouple contact only knows the temperature range of the heat sink and the heating element, and can remind the user to avoid touching the high temperature heat sink module and the heating element.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand and implement the technical content of the present invention, and according to the content disclosed in this specification, the scope of patent applications and the drawings. Anyone skilled in the related art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any way.

First, a thermochromic laminate according to an embodiment of the present invention will be described. Please refer to FIG. 1, which is a schematic diagram of a thermochromic laminated on a heat sink. The temperature-sensitive color-changing laminate 100 is used for being disposed on a heat-generating element or a heat-radiating element 201. In this embodiment, the heat sink 201 is taken as an example for description, but the application scope of the present invention is not limited thereto. The thermochromic laminate of the present invention can also be applied to any heat-dissipating element or object whose temperature changes, such as a motherboard cooling fin, a CPU heat sink, a VGA heat sink, an IPC FANLESS heat sink, or an aluminum extrusion case.

The thermochromic laminate 100 includes a color layer 103 and a shielding layer 105. The color layer 103 is disposed on a surface of the heat sink 201. The material of the color layer 103 may include a first adhesive and a colorant. The composition of the first adhesive may include 10% to 30% (10% to 30% by weight) of silicon rubber and 5% to 25% by weight of polysilane (relative to the total weight of the thermochromic laminate), but not This is limited. The coloring material may be blue ore, but is not limited thereto, and other coloring materials may also be used. The color layer 103 may also include a heat-dissipating material to help transfer heat from the heat-generating element to the shielding layer 105, thereby enhancing the heat-radiating function of the thermochromic stack 100. The heat dissipating material is, for example, ceramic, graphene, carbon nanotube, or metal powder, but is not limited thereto.

The shielding layer 105 is disposed on the color layer 103 so that the color layer 103 is located between the shielding layer 105 and the heat sink 201. The material of the shielding layer 105 includes a transparency changing material and a second adhesive. The material for changing the transparency may include tungsten oxide, but is not limited thereto, and other materials whose transparency changes with temperature may also be used. The second adhesive may include a styrene polymer for better adhesion, but is not limited thereto. The weight percentage of the tungsten oxide used in the embodiment of the present invention with respect to the shielding layer 105 may be 4% or more, preferably 4% to 6%, and more preferably 5%. In one embodiment, when the weight percentage of tungsten oxide is less than 4%, the transparency change effect of the shielding layer 105 is not good. In other embodiments, when the weight percentage of tungsten oxide is greater than 6%, the excessive tungsten oxide has a limited effect on the transparency change of the shielding layer 105, and the manufacturing cost of the shielding layer 105 increases. In another embodiment, when the weight percentage of tungsten oxide is 5%, the effect of changing the transparency of the shielding layer 105 meets the requirements.

When the temperature of the shielding layer 105 is above a specified temperature interval, the transparency of the transparency changing material in the shielding layer 105 will increase, thereby revealing the color of the color layer 103 covered by the shielding layer 105. Wherein, the specified temperature range where the transparency of the shielding layer 105 changes is related to the total thickness of the thermochromic laminate 100. When the total thickness of the thermochromic laminate 100 is thicker, the specified temperature interval where the transparency of the shielding layer 105 changes is higher. Furthermore, the thickness ratio of the color layer 103 and the shielding layer 105 also affects a specified temperature interval where the transparency of the shielding layer 105 changes. Therefore, by adjusting the total thickness of the thermochromic stack 100, or adjusting the thickness ratio of the color layer 103 and the shielding layer 105, the specified temperature interval where the transparency of the shielding layer 105 changes can be changed.

The change in the transparency of the shielding layer 105 is a change in continuity. The appearance of the heat sink 201 provided with the thermochromic laminate 100 is originally black. When the temperature of the shielding layer 105 rises above a specified temperature range, the transparency of the shielding layer 105 gradually increases, and the color of the color layer 103 below is exposed. . As the temperature of the shielding layer 105 falls below a specified temperature interval, the transparency of the shielding layer 105 gradually decreases, and the heat sink 201 provided with the thermochromic laminate 100 returns to the original black color. When the total thickness of the color layer 103 and the shielding layer 105 is 70-80 μm, and the thickness ratio of the color layer 103 and the shielding layer 105 is 1.3: 1 to 1.2: 1, the specified temperature range of the color change is 35-46 ° C. When the total thickness of the color layer 103 and the shielding layer 105 is 75 μm, and the thickness ratio of the color layer 103 and the shielding layer 105 is 1.25: 1, the temperature at which the color starts to change is 35 ° C. When the total thickness of the color layer 103 and the shielding layer 105 is 95-105 μm, and the thickness ratio of the color layer 103 and the shielding layer 105 is 1.1: 1 to 0.9: 1, the specified temperature range of the color change is 65-68 ° C. When the total thickness of the color layer 103 and the shielding layer 105 is 100 μm, and the thickness ratio of the color layer 103 and the shielding layer 105 is 1: 1, the temperature at which the color starts to change is 65 ° C.

In this embodiment, the color layer 103 and the shielding layer 105 can be spray-coated on the heat sink 201 in the manner of general automobile paint. First, the color layer 103 is sprayed on the surface of the heat sink 201, and then baked in an oven at 40 to 60 ° C for 15 to 30 minutes, and then baked at 90 to 110 ° C for 50 to 70 minutes. Then, the shielding layer 105 is sprayed on the heat sink 201 having the color layer 103 and then dried at room temperature. Although the embodiment of the present invention is sprayed in the manner of automobile paint, it is not limited thereto. In other embodiments, general painting methods such as electrostatic adsorption, manual painting, and immersion coating can also be used.

In addition, in the embodiment, the spray area is the entire surface of the heat sink 201, but it is not limited thereto, and it may also be partially sprayed on the surface of the heat pipe. The discoloration time of the spray area depends on the distance between the spray area and the heat source. The spraying area near the heat source starts to change color earlier.

Next, a heat dissipation module 200 according to an embodiment of the present invention will be described. Please refer to FIG. 2, which is a schematic perspective view of a heat dissipation module. It includes a heat sink 201, a thermochromic stack, a fan 203, and an image detector 205.

The thermochromic laminate is the thermochromic laminate 100 of the previous embodiment, and includes a color layer 103 and a shielding layer 105 sprayed on the heat sink 201. For detailed descriptions, please refer to the above content, and will not be repeated here.

The air outlet of the fan 203 faces the heat-dissipating member 201 coated with a thermosensitive color-changing laminate to help dissipate heat. The fan 203 will affect the heat dissipation efficiency and temperature of the heat dissipation module, and then affect the time at which the color of the thermochromic stack starts to change and the time required to completely change.

A fan is provided in this embodiment to further assist the heat dissipation member to dissipate heat, thereby improving heat dissipation efficiency, but other embodiments may not include a fan. The cooling module without a fan mainly dissipates heat by natural convection or radiation.

The detector used in this embodiment may be an image detector 205, including a body 205a and a lens 205b. The lens 205b is located on one side of the body 205a, and the lens 205b faces the heat-dissipating member 201 coated with a thermochromic layer to detect a change in color. Thereby, the temperature change on the surface of the heat sink 201 can be known in a non-direct contact manner. In addition, the image detector 205 in this embodiment may be an infrared detector, which detects a color change on the surface of the heat sink 201 and can be read by a computer system by a USB device. In other embodiments, a mobile phone with an infrared detection function can also be used to detect the color change on the surface of the heat sink 201, and the temperature of the heat sink 201 can be displayed by the APP, but it is not limited to this.

This embodiment is provided with an image detector to detect the temperature of the surface of the heat sink 201, but other embodiments may not be provided with an image detector. In other embodiments, the temperature of the heat sink can also be obtained through a thermocouple or a commonly used method.

Next, the results of the heat dissipation test of the embodiment of the present invention are described in detail. Please refer to Table 1 and FIGS. 3 to 8. Table 1 separately records whether the fan is installed in Examples 1 to 3, the fan air volume (CFM, cubic feet per minute, ft ³ / min), the time when the CPU and the heat sink start to change color in the thermochromic stack, and Temperature, the time and temperature from when the temperature of the heat sink rises until the thermochromic laminate completely changes color, the time (Δt) required for the thermochromic laminate to change from color to complete, and the time required for a unit temperature s / ° C). As shown in Table 1 below, in the heat dissipation modules of Examples 1 to 3, the total thickness of the thermochromic laminate is 75 μm, the length of the heat sink is 70 mm, the width is 70 mm, and the height is 30 mm. The power of the CPU provided with the heat dissipation modules of Examples 1 to 3 was 14 W.

Table 1
Laminated thickness: 75 μm Radiator size: 70 × 70 × 30 mm CPU: 14 W Examples Example 1 Example 2 Example 3 Ambient temperature 23 ℃ 30 ℃ 23 ℃ fan 1.8 CFM 3.1 CFM no Discoloration begins (Figure 3) Fully discolored (Figure 4) Discoloration begins (Figure 5) Fully discolored (Figure 6) Discoloration begins (Figure 7) Fully discolored (Figure 8) Time (s) 135 540 Δt (s) 405 twenty two 420 Δt (s) 398 120 320 Δt (s) 200 Temperature of heat sink ℃ 35.7 43 Δt / ΔT (s / ℃) 55.5 35.3 43.8 Δt / ΔT (s / ℃) 46.8 36.4 46 Δt / ΔT (s / ℃) 20.8 CPU temperature ℃ 43 50 Δt / ΔT (s / ℃) 57.9 41 49 Δt / ΔT (s / ℃) 49.8 42 52 Δt / ΔT (s / ℃) 20

The influence of ambient temperature was compared between Example 1 and Example 2. In Example 1, when the ambient temperature is 23 ° C., it takes 135 seconds for the heat sink to reach a temperature at which the temperature-sensitive color-changing stack starts to change color. In Example 2, when the ambient temperature is 30 ° C., the heat sink only needs 22 seconds to reach the temperature at which the temperature-sensitive color-changing laminate starts to change color. In addition, in Example 1, when the ambient temperature was 23 ° C., the time required from the start of the temperature rise of the heat sink to the complete discoloration of the thermochromic laminate was 540 seconds. The time (Δt) required for the color of the thermochromic laminate to start to change completely to 405 seconds. The final equilibrium temperature of the heat sink is 48.2 ° C, and the final equilibrium temperature of the CPU is 55 ° C. Within the discoloration range, the time required for a unit temperature change of the heat sink is 55.5 s / ° C, and the time required for a unit temperature change of the CPU is 57.9 s / ° C. In Example 2, when the ambient temperature is 30 ° C, the time required for the temperature rise of the heat sink to completely change the color of the thermochromic laminate is 420 seconds, and the time required for the color of the thermochromic laminate to change to a complete change ( Δt) is 398 seconds. The final equilibrium temperature of the heat sink is 47.8 ° C, and the final equilibrium temperature of the CPU is 52 ° C. Within the discoloration range, the time required for a unit temperature change of the heat sink is 46.8 s / ° C, and the time required for a unit temperature change of the CPU is 49.8 s / ° C. It can be known that when the ambient temperature is high, the heat sink quickly reaches the temperature at which the thermochromic stack starts to change color, and the time required for the thermochromic stack to start to change color to full color is also shorter. The time required for temperature changes is also shorter. In addition, the ambient temperature has a considerable effect on the temperature of the heat sink. Even if a larger air volume fan is installed at an ambient temperature of 30 ° C, the time for the temperature-sensitive discoloration stack to start discoloring and the time required to start discoloring to complete discoloration are less than the environment. The temperature was 23 ° C.

Next, when the ambient temperature is 23 ° C., the presence or absence of the influence of a fan is compared between Example 1 and Example 3. In Example 1, the time taken for the heat dissipating element equipped with a 1.8 CFM fan to make the temperature-sensitive discoloration stack start to change color is 135 seconds, and the time required from the temperature of the heat-dissipating element to rise until the temperature-sensitive discoloration stack completely changes color is 540. The time (Δt) required for the second, temperature-sensitive discoloration stack color to start discoloring to complete discoloration was 405 seconds. The final equilibrium temperature of the heat sink is 48.2 ° C, and the final equilibrium temperature of the CPU is 55 ° C. Within the discoloration range, the time required for a unit temperature change of the heat sink is 55.5 s / ° C, and the time required for a unit temperature change of the CPU is 57.9 s / ° C. In Example 3, the time taken for the heat sink without a fan to reach the temperature-sensitive discoloration stack to start discoloring was 120 seconds, and the time from the temperature rise of the heat-dissipating member to the temperature-sensitive discoloration stack to completely change color was 320 seconds. The time ([Delta] t) required for the color of the thermosensitive discoloration laminated layer to start discoloring to be completely discolored was 200 seconds. The final equilibrium temperature of the heat sink is 59.8 ° C, and the final equilibrium temperature of the CPU is 66 ° C. Within the discoloration range, the time required for a unit temperature change of the heat sink is 20.8 s / ° C, and the time required for a unit temperature change of the CPU is 20 s / ° C. It can be seen that the time for the heat dissipating member without a fan to reach the temperature of the thermochromic stack changes color, and the time required for the thermochromic stack color to start to change to full color is also shorter, and the unit temperature changes The time required is also shorter. From the experimental results, it can be known that in addition to installing the fan, the cooling effect of the heat dissipating member can be definitely improved, and the time required for the temperature-sensitive color-changing stack to start to change color to full color can be affected. In addition, it has been proved that the thermochromic stack of the embodiment of the present invention can faithfully reflect the temperature of the heat sink.

Table 2 records the presence or absence of a fan and the fan air volume (CFM, cubic feet per minute, ft ³ / min), the CPU and the heat sink in the temperature-sensitive color-changing stack of the first and fourth embodiments of the present invention. Time and temperature, the time and temperature from when the temperature of the heat sink rises until the thermochromic laminate completely changes color, the time required for the thermochromic laminate to change from color to complete change (Δt), and the unit temperature change Time (s / ° C). As shown in Table 2 below, in the heat dissipation modules of Examples 4 to 5, the total thickness of the thermochromic laminate is 100 μm, and the size of the heat sink is 84 mm in length, 84 mm in width, and 70 mm in height. The power of the CPU provided with the heat dissipation modules of Examples 4 to 5 was 130 W, and the ambient temperature was 23 ° C.

Table 2
Laminated thickness: 100 μm Heat sink size: 84 × 84 × 70 mm CPU: 130 W Ambient temperature: 23 ℃ Examples Example 4 Example 5 fan 14.87 CFM no Start to change color Completely discolored Start to change color Completely discolored Time (s) 335 506 Δt (s) 171 210 230 Δt (s) 20 Temperature of heat sink ℃ 65 68 Δt / ΔT (s / ℃) 57 65 68 Δt / ΔT (s / ℃) 6.7 CPU temperature ℃ 72 75 Δt / ΔT (s / ℃) 57 71 74 Δt / ΔT (s / ℃) 6.7

When the ambient temperature is 23 ° C., the presence or absence of a fan is compared in Examples 4 and 5. In Example 4, the time taken for the heat sink of the fan equipped with a 14.87 CFM to reach the temperature-sensitive discoloration layer to start discoloring was 335 seconds, and the time from the start of the heat-dissipating member temperature to the temperature-sensitive discoloration layer to be completely discolored was 506. The time ([Delta] t) required for the second, temperature-sensitive discoloration stack color to start discoloring to complete discoloration was 171 seconds. Within the discoloration range, the time required for a unit temperature change is 57 s / ° C. In Example 5, the time taken for the heat sink without a fan to reach the temperature-sensitive color-changing stack to start to change color is 210 seconds, and the time from the temperature of the heat-dissipating member to the temperature-sensitive color-changing stack to completely change color is 230 seconds. The time (Δt) required for the color change of the thermosensitive discoloration laminated layer to start to change completely was 20 seconds. Within the discoloration range, the time required for a unit temperature change is 6.7 s / ° C. It can be seen that the time taken for the heat sink without a fan to reach the temperature at which the temperature-change color-change stack changes color, and the time required for the temperature-change color-change stack color to start to change to complete color change is relatively short, and the unit temperature changes The time required is also shorter. From the experimental results, it can be known that in addition to installing the fan, the cooling effect of the heat dissipating member can be definitely improved, and the time required for the temperature-sensitive color-changing stack to start to change color to full color can be affected. In addition, it has been proved that the thermochromic stack of the embodiment of the present invention can faithfully reflect the temperature of the heat sink.

Finally, referring to Table 1 (Examples 1 to 3) and Table 2 (Examples 4 and 5), it can be seen that when the thickness of the thermochromic laminate is 75 μm (Examples 1 to 3), the thermochromic laminate The temperature at which discoloration started was 35 ° C. When the thickness of the thermochromic laminate is 100 m (Examples 4 and 5), the temperature at which the thermochromic laminate starts to change color is 65 ° C. By installing an additional fan, the heat dissipation efficiency of the heat dissipation module can be changed, and the temperature of the heat sink can be faithfully reflected by the color of the thermochromic stack 100. In addition, you can adjust the rate of color change by using different stack thicknesses and fans with different air volumes, or consider the combination of heat dissipation effect and color change rate in consideration of the ambient temperature to design different color change temperatures and color change rates. Thermal module.

In addition, in the thermochromic laminate according to the embodiment of the present invention, the color layer 103 includes a heat-dissipating material to help transfer heat to the shielding layer 105, thereby enhancing the heat dissipation function of the thermochromic laminate 100. The heat dissipating material is, for example, ceramic, graphene, carbon nanotube, or metal powder, but is not limited thereto. In another embodiment, the difference between the presence or absence of the thermochromic laminate using the foregoing embodiment was compared. In Embodiment 6, a CPU with a power of 181W is provided with a heat dissipation module (the size of the heat sink is 140 × 155 × 55 mm, the fan air volume is 45.53 CFM, and the thickness of the thermochromic stack is 100 μm, as shown in FIG. 9 ), Its maximum CPU temperature is 79 ° C. A CPU with a power of 181W is provided with a heat-dissipating module (a heat sink having a size of 140 × 155 × 55 mm and a fan air volume of 45.53 CFM) that does not use the thermochromic stack of the embodiment of the present invention. Therefore, Example 6 proves that the heat-dissipating module with the thermochromic stack of the embodiment of the present invention has a better effect on the heat dissipation of the CPU, and also illustrates that the thermochromic stack has a function of helping to dissipate heat.

In the embodiment, the object of setting the thermochromic stack is a CPU heat sink as an example, but it is not limited to this. The thermochromic stack can also be applied to any heat-dissipating components or objects whose temperature will change, such as the motherboard heat sink , CPU cooler, VGA cooler, IPC FANLESS heat sink or aluminum extruded casing coating.

An embodiment of the present invention provides a temperature-sensitive color-changing laminate and a heat dissipation module including the same. When the temperature of the shielding layer rises above a specified temperature interval, the shielding layer reveals the color of the color layer. Therefore, the temperature-sensitive color-changing stack on the surface of the heat sink of the embodiment of the present invention may cause a color change. Compared with common single-color heat sinks, the heat sink module of the embodiment of the present invention can have more abundant changes in appearance, which is more in line with modern aesthetic requirements. In addition, the user can also know the temperature of the heating element (such as CPU or chip) through the color change of the thermochromic stack, so that the user can more quickly understand the temperature range of the heat dissipation element and the heating element without going through The direct contact method of the thermocouple contact only knows the temperature range of the heat sink and the heating element, and can remind the user to avoid touching the high temperature heat sink module and the heating element.

In addition, the surface radiation wavelength is different due to the color change of the thermochromic stack. The color change of the thermochromic stack can be detected by an image detector (such as an infrared detector), which is different from the traditional one. The detector needs direct contact to detect temperature changes. The image detector can be read by a computer system through a USB device, or it can even be detected directly by a mobile phone with infrared detection function and displayed by its APP.

In addition, the material of the temperature-sensitive color-changing laminate of the embodiment of the present invention includes a transparency-changing material and a heat-dissipating material (such as ceramics), which are uniformly coated on the entire surface of the heat-dissipating member after being proportioned. Effect.

The thermochromic laminate of the embodiment of the present invention has both color change and heat dissipation, so it is used in heat sinks such as motherboard cooling fins, CPU heat sinks, VGA heat sinks, IPC FANLESS heat sinks, or aluminum extrusion cases, which can provide a variety of Appearance and the effect of improving heat dissipation.

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. Changes and modifications made without departing from the spirit and scope of the present invention belong to the patent protection scope of the present invention. For the protection scope defined by the present invention, please refer to the attached patent application scope.

100‧‧‧Temperature-change color stack

103‧‧‧ Color Layer

105‧‧‧ Masking layer

200‧‧‧ Thermal Module

201‧‧‧ heat sink

203‧‧‧fan

205‧‧‧Image Detector

205a‧‧‧Ontology

205b‧‧‧ lens

FIG. 1 is a schematic view showing that a thermochromic layer is laminated on a heat sink.
FIG. 2 is a schematic perspective view of a heat dissipation module.
FIG. 3 is a photograph of the discoloration of the thermochromic laminate in Example 1. FIG.
FIG. 4 is a photograph of the thermochromic laminate of Example 1 being completely discolored.
FIG. 5 is a photograph of the discoloration of the thermochromic laminate in Example 2. FIG.
FIG. 6 is a photograph of the thermochromic laminate of Example 2 being completely discolored.
FIG. 7 is a photograph of the discoloration of the thermochromic laminate of Example 3. FIG.
FIG. 8 is a photo of the thermochromic laminate of Example 3 being completely discolored.
FIG. 9 is a photograph of a heat-dissipating module with a thermochromic stack in Example 6. FIG.

Claims (9)

A temperature-sensitive color-changing laminate for being disposed on a heat-generating element or a heat-radiating element, comprising: a color layer disposed on the surface of the heat-generating element or the heat-radiating element; and a shielding layer disposed on the color layer, and The color layer is located between the shielding layer and the heating element or the heat dissipating element. When the temperature of the shielding layer is above a specified temperature interval, the shielding layer reveals the color of the color layer; wherein the shielding layer includes a change in transparency Material, the transparency changing material contains tungsten oxide. The thermochromic laminate according to claim 1, wherein the color layer includes a heat dissipating material and a color material. For example, the thermochromic laminate of claim 1, wherein the weight percentage of tungsten oxide to the shielding layer is 4% or more. For example, the thermochromic laminate of claim 1, wherein the total thickness of the color layer and the shielding layer is 70-80 μm, and the specified temperature range is 35-46 ° C. For example, the thermochromic laminate of claim 4, wherein the thickness ratio of the color layer and the shielding layer is 1.3: 1 to 1.2: 1. For example, the thermochromic laminate of claim 1, wherein the total thickness of the color layer and the shielding layer is 95-105 μm, and the specified temperature range is 65 ° C-68 ° C. The thermochromic laminate according to claim 6, wherein the thickness ratio of the color layer and the shielding layer is 1.1: 1 to 0.9: 1. A heat-dissipating module includes: a heat-dissipating member; and a temperature-sensitive color-changing stack according to any one of claim 1 to claim 7. For example, the heat dissipation module of claim 8 further includes an image detector, and a lens of the image detector faces the thermochromic stack.