TW202031113A - Temperature-dependent color-changed multilayer and thermal module including the same - Google Patents

Abstract

The present disclosure relates to a temperature-dependent color-changed multilayer and a thermal module including the same. The multilayer includes a color layer and a cover layer. The color layer is disposed on the surface of a heat sink. The cover layer is disposed on the color layer, and the color layer is between the cover layer and the heat sink. When the temperature of the cover layer increases up to a specified range, the cover layer exposes the color of the color layer. The thermal module includes a heat sink and a temperature-dependent color-changed multilayer. When the temperature increases, the color of the heat sink can be changed and observed in visual. The present disclosure provides a thermal module with both changed-color and heat dissipation.

Description

Thermochromic laminated layer and heat dissipation module containing the same

The present invention relates to a laminated layer and a heat dissipation module containing it. In particular, it relates to a temperature-sensitive and color-changing laminate and a heat dissipation module containing 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 will be generated or accumulated. Failure to dissipate heat in time may affect the normal operation of electronic products, reduce their lifespan or even cause damage. Therefore, in order to maintain the normal operation of electronic products, a heat dissipation module needs to be installed. The heat dissipation module usually includes heat pipes, heat sinks and fans. The material of the heat sink is generally metal, and its appearance is mostly metallic. However, today, where aesthetics are emphasized, many products with various appearances have been developed, such as transparent casings or casings with inherent heat dissipation functions. Therefore, in order to make the heat sink have a variety of colors, different colors of paint will be sprayed on its surface.

Generally, heat sinks are mostly metal materials, so their appearance is mostly metallic. Some heat sinks 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 change with the temperature state and is slightly monotonous. In addition, these heat sinks cannot provide temperature information to the user by observing the appearance of the heat sink in an indirect contact manner, and require direct contact, such as thermocouple contact, to provide temperature information to the user.

The present invention provides a temperature-sensing color-changing laminated layer, which can be applied to the heat sink in a heat-dissipating module, making it a temperature-sensing color-changing heat dissipation module. This solves the problem that the general heat dissipation module is slightly monotonous in appearance and needs to be contacted by a thermocouple to know its temperature.

The temperature-sensitive and color-changing laminate in an embodiment of the present invention is arranged on the surface of the heating element or the heat dissipation element. The thermochromic laminate includes a color layer and a shielding layer. The color layer is arranged on the surface of the heating element or the heat dissipation element. The shielding layer is arranged on the color layer, and the color layer is located between the shielding layer and the heating element or the heat dissipation element. When the temperature of the shielding layer is above the specified temperature range, the shielding layer reveals the color of the color layer.

The heat dissipation module of an embodiment of the present invention includes a heat dissipation element and the temperature-sensitive and color-changing laminated layer of the foregoing embodiment. The temperature-sensitive and color-changing laminated layer is arranged on the surface of the heat sink.

An embodiment of the present invention provides a temperature-sensitive and color-changing laminate and a heat dissipation module including the same. When the temperature of the shielding layer rises above the specified temperature range, the shielding layer reveals the color of the color layer. Therefore, the temperature-sensitive and color-changing laminated layer on the surface of the heat sink of the present invention will change in color. Compared with common heat sinks with a single color, the heat dissipation module of the embodiment of the present invention can have more abundant changes in appearance, which is more in line with modern aesthetic requirements. Furthermore, the user can also know the temperature of the heating element (such as CPU or chip) by the color change of the thermochromic stack, allowing the user to more quickly understand the temperature range of the heat sink and the heating element without going through The direct contact method of the thermocouple 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 to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and in accordance with the content disclosed in this specification, the scope of patent application and the drawings Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoint of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

First, the thermochromic laminated layer of an embodiment of the present invention will be explained. Please refer to FIG. 1. FIG. 1 is a schematic diagram of the temperature-sensitive and color-changing laminated layer on the heat sink. The temperature-sensitive and color-changing laminate 100 is used to be arranged on a heating element or a heat dissipation 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 to this. The temperature-sensitive and color-changing laminate of the present invention can also be applied to any heat-dissipating components or objects whose temperature changes, such as motherboard heat sinks, CPU heat sinks, VGA heat sinks, IPC FANLESS heat sinks or aluminum extruded chassis.

The thermochromic laminated layer 100 includes a color layer 103 and a shielding layer 105. The color layer 103 is disposed on the 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% (10wt% to 30wt%) of silicone and 5wt% to 25wt% of polysiloxane (the weight percentage relative to the total weight of the thermochromic laminate), but not This is limited. The color material can be blue ore, but it is not limited to this, and other color materials can also be used. The color layer 103 may also include heat dissipation materials to help heat transfer from the heating element to the shielding layer 105, thereby enhancing the heat dissipation function of the thermochromic laminate 100. The heat dissipation material is, for example, ceramics, graphene, carbon nanotubes or metal powder, but is not limited thereto.

The shielding layer 105 is disposed on the color layer 103 such 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 change material and a second adhesive. The transparency change material may include tungsten oxide, but it is not limited to this, and other materials whose transparency changes with temperature can also be used. The second adhesive may include a styrene polymer to achieve a better adhesive effect, but is not limited thereto. Wherein, the weight percentage of the tungsten oxide used in the embodiment of the present invention relative to the shielding layer 105 may be more than 4%, 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%, too much tungsten oxide has a limited effect on the transparency change of the shielding layer 105, and will increase the manufacturing cost of the shielding layer 105. In another embodiment, when the weight percentage of tungsten oxide is 5%, the transparency change effect of the shielding layer 105 best meets the requirements.

When the temperature of the shielding layer 105 is above the specified temperature range, the transparency of the transparency change material in the shielding layer 105 will increase, thereby revealing the color of the color layer 103 covered by the shielding layer 105. Among them, the specified temperature interval at which the transparency of the shielding layer 105 changes is related to the total thickness of the thermochromic laminated layer 100. When the total thickness of the thermochromic laminated layer 100 is thicker, the specified temperature interval for the transparency change of the shielding layer 105 is higher. Furthermore, the thickness ratio of the color layer 103 and the shielding layer 105 will also affect the specified temperature range for the transparency of the shielding layer 105 to change. Therefore, by adjusting the total thickness of the thermochromic laminated layer 100 or adjusting the thickness ratio of the color layer 103 and the shielding layer 105, the specified temperature range for the transparency change of the shielding layer 105 can be changed.

The change in transparency of the shielding layer 105 is a continuous change. The appearance of the heat sink 201 provided with the thermochromic laminated layer 100 is originally black. When the temperature of the shielding layer 105 rises above the specified temperature range, the transparency of the shielding layer 105 gradually increases, and the color of the color layer 103 below is revealed . As the temperature of the shielding layer 105 drops below the specified temperature range, the transparency of the shielding layer 105 gradually decreases, and the heat sink 201 provided with the thermochromic laminate 100 returns to its 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 to 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 sprayed on the heat sink 201 in a general car paint method. First, after spraying the color layer 103 on the surface of the heat sink 201, it is baked in an oven at 40-60°C for 15-30 minutes, and then baked at 90-110°C for 50-70 minutes. Then, the shielding layer 105 is sprayed on the heat sink 201 with the color layer 103 and then dried at room temperature. Although the embodiment of the present invention is sprayed in the form of car paint, it is not limited to this. In other embodiments, general painting methods such as electrostatic adsorption, manual painting, and immersion in paint can also be used.

In addition, in the embodiment, the spraying area is the entire surface of the heat sink 201, but it is not limited to this, and it can also be sprayed locally on the surface of the heat pipe. The discoloration time of the sprayed area depends on the distance between the sprayed area and the heat source. The spray area closer to 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 perspective view of the heat dissipation module. It includes a heat sink 201, a temperature-sensitive and color-changing laminate, a fan 203 and an image detector 205.

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

The air outlet of the fan 203 faces the heat sink 201 coated with a temperature-sensitive and color-changing laminated layer to help heat dissipation. The fan 203 will affect the heat dissipation efficiency and temperature of the heat dissipation module, and further affect the time when the color of the temperature-sensitive and color-changing laminate starts to change and the time required for the complete change.

In this embodiment, a fan is provided to further assist the heat sink to dissipate heat, thereby improving the heat dissipation efficiency, but other embodiments may not be provided with a fan. The heat dissipation 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 main body 205a, and the lens 205b faces the heat sink 201 coated with a temperature-sensitive and color-changing laminated layer to detect color changes. In this way, the temperature change of the surface of the heat sink 201 can be known by the indirect contact method. In addition, the image detector 205 of this embodiment can be an infrared detector, which detects the color change on the surface of the heat sink 201 and can be interpreted by the computer system by the USB device. In other embodiments, a mobile phone with infrared detection function can also be used to detect the color change on the surface of the heat sink 201, and the APP displays its temperature, 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 common method.

Next, the results of the heat dissipation test of the embodiment of the present invention will be described in detail, please refer to Table 1 and FIGS. 3-8. Table 1 respectively records whether there is a fan installed in Examples 1 to 3, the air volume of the fan (CFM, cubic feet per minute, ft ³ /min), the time and the time when the CPU and the heat sink start to change color when the temperature-sensitive color-changing stack Temperature, the time and temperature from the temperature rise of the heat sink to the complete discoloration of the thermochromic laminate, the time (Δt) required for the thermochromic laminate to change from color to complete change, and the time required for unit temperature change ( s/℃). As shown in Table 1 below, in the heat dissipation modules of Examples 1 to 3, the total thickness of the thermochromic laminated layer 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 equipped with the heat dissipation modules of Examples 1 to 3 is 14 W.

Table 1 Layer thickness: 75 μm Heat sink size: 70×70×30 mm CPU: 14 W Example Example 1 Example 2 Example 3 Ambient temperature 23℃ 30℃ 23℃ fan 1.8 CFM 3.1 CFM no Start to change color (Picture 3) Complete discoloration (Picture 4) Start to change color (Picture 5) Complete discoloration (Figure 6) Start to change color (Picture 7) Complete discoloration (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 °C 43 50 Δt/ΔT (s/℃) 57.9 41 49 Δt/ΔT (s/℃) 49.8 42 52 Δt/ΔT (s/℃) 20

Example 1 and Example 2 are used to compare the influence of ambient temperature. In Example 1, when the ambient temperature is 23°C, it takes 135 seconds for the heat sink to reach the temperature at which the temperature-sensitive color-changing laminate starts to change color. However, 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 is 23° C., the time required for the temperature of the heat sink to rise to the complete discoloration of the thermochromic laminate is 540 seconds. The time (Δt) required for the color of the thermochromic stacking layer to change color completely is 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 range of discoloration, the time required for a unit temperature change of the heat sink is 55.5 s/℃, and the time required for a unit temperature change of the CPU is 57.9 s/℃. In Example 2, when the ambient temperature is 30°C, the time required for the temperature of the heat dissipating element to rise to the complete discoloration of the thermochromic laminate is 420 seconds, and the time required for the color of the thermochromic laminate to start to change to 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 range of color change, the time required for a unit temperature change of the heat sink is 46.8 s/℃, and the time required for a unit temperature change of the CPU is 49.8 s/℃. It can be seen that when the ambient temperature is high, the heat sink reaches the temperature that the temperature-sensitive and color-changing laminate starts to change color sooner, and the time required for the color of the temperature-sensitive and color-changing laminate to start to change completely is also shorter. The time required for temperature changes is also shorter. In addition, the ambient temperature has a great influence on the temperature of the heat sink. Even if a fan with a larger air volume is installed at an ambient temperature of 30°C, the time required for the temperature-sensitive color-changing stack to start discoloring and the time required to start discoloring to complete discoloration are less than the environment The temperature is 23°C.

Next, when the ambient temperature is 23° C., compare Example 1 and Example 3 with or without fan influence. In Example 1, the time for the heat dissipating element with a 1.8 CFM fan to make the temperature-sensitive color-changing laminate start to change color is 135 seconds, and the time required from the temperature of the heat-dissipating element to rise to the temperature-sensitive color-changing laminate completely changing color is 540 seconds. Seconds, the time (Δt) required for the color of the thermochromic stacking layer to change color completely is 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 range of discoloration, the time required for a unit temperature change of the heat sink is 55.5 s/℃, and the time required for a unit temperature change of the CPU is 57.9 s/℃. In Example 3, the time for the heat dissipating element without additional fan to start the color change of the thermochromic laminate is 120 seconds, and the time required for the temperature of the heat dissipating element to rise to the complete discoloration of the thermochromic laminate is 320 seconds. The time (Δt) required for the temperature-sensitive color-changing laminated color to change color to complete color change is 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 range of color change, the time required for a unit temperature change of the heat sink is 20.8 s/℃, and the time required for a unit temperature change of the CPU is 20 s/℃. It can be seen that the time for the heat sink without a fan to reach the temperature of the temperature-sensitive and color-changing laminate is faster, and the time required for the color of the temperature-sensitive and color-changing laminate to change to complete color change is also shorter, and the unit temperature changes The time required is also shorter. From the experimental results, it can be seen that installing a fan can not only improve the cooling effect of the heat sink, but also affect the time required for the temperature-sensitive color-changing laminate to change color to complete color change. In addition, it is also proved that the temperature-sensitive and color-changing laminated layer of the embodiment of the present invention can faithfully reflect the temperature of the heat sink.

Table 2 respectively records whether there is a fan installed in the embodiments 4 and 5 of the present invention, the air volume of the fan (CFM, cubic feet per minute, ft ³ /min), the CPU and the heat sink start to change color when the temperature-sensitive color-changing laminate Time and temperature, the time and temperature from the temperature rise of the heat sink to the complete discoloration of the thermochromic laminate, the time (Δt) required for the thermochromic laminate to change from the color to the complete change, and the unit temperature change required Time (s/℃). As shown in Table 2 below, in the heat dissipation modules of Examples 4 to 5, the total thickness of the thermochromic laminated layer is 100 μm, 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 Embodiments 4 to 5 is 130 W, and the ambient temperature is 23°C.

Table 2 Stack thickness: 100 μm Heat sink size: 84×84×70 mm CPU: 130 W Ambient temperature: 23 ℃ Example 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 °C 72 75 Δt/ΔT (s/℃) 57 71 74 Δt/ΔT (s/℃) 6.7

When the ambient temperature is 23°C, the influence of the fan is compared with the examples 4 and 5. In Example 4, the heat sink equipped with a 14.87 CFM fan reached 335 seconds for the temperature-sensitive color-changing laminate to start to change color, and the time required from the temperature of the heat sink to rise to the temperature-sensitive color-changing laminate completely changing color was 506 Seconds, the time (Δt) required for the temperature-sensitive color-changing stack color to change color to complete color change is 171 seconds. Within the range of color change, the time required for unit temperature change is 57 s/℃. In Example 5, the time for the heat sink without a fan to start to change color of the temperature-sensitive and color-changing laminate is 210 seconds, and the time required from the temperature of the heat sink to rise to the complete discoloration of the temperature-sensitive and color-changing laminate is 230 seconds. The time (Δt) required for the color of the thermochromic stacking layer to change color completely is 20 seconds. In the color change range, the time required for a unit temperature change is 6.7 s/℃. It can be seen that the time for the heat sink without a fan to reach the temperature of the temperature-sensitive and color-changing laminated layer is faster, and the time required for the color of the temperature-sensitive and color-changing laminated layer to change to complete color change is also shorter, and the unit temperature changes The time required is also shorter. From the experimental results, it can be seen that installing a fan can not only improve the cooling effect of the heat sink, but also affect the time required for the temperature-sensitive color-changing laminate to change color to complete color change. In addition, it is also proved that the temperature-sensitive and color-changing laminated layer of the embodiment of the present invention can faithfully reflect the temperature of the heat sink.

Finally, referring to Table 1 (Examples 1~3) and Table 2 (Examples 4, 5), it can be known that when the thickness of the thermochromic laminate is 75 μm (Examples 1 to 3), the thermochromic laminate The temperature at which the color began to change was 35°C. When the thickness of the thermochromic laminate is 100 μm (Examples 4 and 5), the temperature at which the thermochromic laminate starts to change color is 65°C. With the addition of a fan, the heat dissipation efficiency of the heat dissipation module can be changed, and the temperature of the heat dissipation element can be faithfully reflected by the color of the temperature-sensitive color-changing laminate 100. In addition, it is also possible to adjust the rate of color change by using different laminate thicknesses and fans with different air volumes, or to select a combination of heat dissipation effect and color change rate in consideration of the ambient temperature, so as to design different color change temperatures and rates Cooling module.

In addition, in the thermochromic laminate of the embodiment of the present invention, the color layer 103 includes a heat dissipation material to help heat transfer to the shielding layer 105, thereby enhancing the heat dissipation function of the thermochromic laminate 100. The heat dissipation material is, for example, ceramics, graphene, carbon nanotubes or metal powder, but is not limited thereto. In another embodiment, the difference between whether or not the thermochromic laminate of the previous embodiment is used is compared. In Example 6, a heat dissipation module is installed on a CPU with a power of 181W (the size of the heat sink is 140×155×55 mm, the air volume of the fan is 45.53 CFM, and the thickness of the temperature-sensitive and color-changing laminate is 100 μm, as shown in Figure 9. ), the highest CPU temperature is 79°C. A heat dissipation module (heat sink size 140×155×55 mm, fan air volume 45.53 CFM) that does not use the thermochromic stack of the embodiment of the present invention is installed on a CPU with a power of 181W, and the maximum CPU temperature is 82°C. Therefore, Example 6 proves that the heat dissipation module with the thermochromic laminated layer of the embodiment of the present invention has a better effect on the heat dissipation of the CPU, and also shows that the thermochromic laminated layer has the function of helping heat dissipation.

In the embodiment, the temperature-sensitive and color-changing laminate is used as an example of a CPU heat sink, but it is not limited to this. The temperature-sensitive and color-changing laminate can also be applied to any heat-dissipating element or an object whose temperature changes, such as a motherboard heat sink , CPU radiator, VGA radiator, IPC FANLESS heat sink or aluminum extruded casing paint.

The embodiment of the present invention provides a temperature-sensitive and color-changing laminate and a heat dissipation module including the same. When the temperature of the shielding layer rises above the specified temperature range, the shielding layer reveals the color of the color layer. Therefore, the temperature-sensitive and color-changing laminated layer on the surface of the heat sink in the embodiment of the present invention will change in color. Compared with common heat sinks with a single color, the heat dissipation module of the embodiment of the present invention can have more abundant changes in appearance, which is more in line with modern aesthetic requirements. Furthermore, the user can also know the temperature of the heating element (such as CPU or chip) by the color change of the thermochromic stack, allowing the user to more quickly understand the temperature range of the heat sink and the heating element without going through The direct contact method of the thermocouple 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, due to the color change of the thermochromic laminate, the surface radiation wavelength is different. An image detector (such as an infrared detector) can be used to detect the color change of the thermochromic laminate to know the temperature change, which is different from the traditional The detector requires direct contact to detect temperature changes. The image detector can be interpreted by the computer system through a USB device, or even a mobile phone with infrared detection function can directly detect and display its temperature by the APP.

In addition, the temperature-sensitive and color-changing laminate material of the embodiment of the present invention includes a transparency change material and a heat dissipation material (such as ceramics), which are uniformly coated on the entire surface of the heat dissipation member after being adjusted in proportion. In addition to the color change effect, it also helps to cool down. Effect.

The temperature-sensitive and color-changing laminate in the embodiment of the present invention has both color change and heat dissipation, so it is applied to heat sinks such as motherboard heat sinks, CPU heat sinks, VGA heat sinks, IPC FANLESS heat sinks or aluminum extruded chassis, and can provide a variety of heat sinks The 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. All changes and modifications made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the attached patent scope.

100: Thermochromic stacking 103: color layer 105: Masking layer 200: cooling module 201: heat sink 203: Fan 205: Image Detector 205a: body 205b: lens

Figure 1 is a schematic diagram of the temperature-sensitive and color-changing laminated layer on the heat sink. Figure 2 is a three-dimensional schematic diagram of the heat dissipation module. Figure 3 is a photograph of the temperature-sensitive and color-changing laminate of Example 1 starting to change color. Fig. 4 is a photograph showing the complete discoloration of the thermochromic laminated layer of Example 1. Fig. 5 is a photograph of the temperature-sensitive and color-changing laminate of Example 2 starting to change color. Fig. 6 is a photograph showing the complete discoloration of the thermochromic laminated layer of Example 2. Fig. 7 is a photograph of the temperature-sensitive and color-changing laminate of Example 3 starting to change color. Fig. 8 is a photograph showing the complete discoloration of the thermochromic laminated layer of Example 3. FIG. 9 is a photograph of a heat dissipation module with a temperature-sensitive and color-changing laminated layer of Example 6. FIG.

200: cooling module

201: heat sink

203: Fan

205: Image Detector

205a: body

205b: lens

Claims (10)

A temperature-sensitive and color-changing laminated layer for setting on a heating element or a heat sink, comprising: a color layer provided on the surface of the heating element or the heat sink; and a shielding layer provided on the color layer, and The color layer is located between the shielding layer and the heating element or the heat dissipation element. When the temperature of the shielding layer is above a specified temperature range, the shielding layer reveals the color of the color layer. Such as claim 1, wherein the color layer includes a heat dissipation material and a color material; and the shielding layer includes a transparency change material. Such as the thermochromic laminate of claim 2, wherein the transparency change material contains tungsten oxide. For example, the thermochromic laminated layer of claim 3, wherein the weight percentage of tungsten oxide relative to the shielding layer is more than 4%. For example, the thermochromic laminated layer 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 5, 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. For example, the thermochromic laminated layer of claim 7, wherein the thickness ratio of the color layer and the shielding layer is 1.1:1 to 0.9:1. A heat dissipation module includes: a heat dissipation element; and a temperature-sensitive and color-changing laminated layer as described in any one of claim 1 to claim 8. For example, the heat dissipation module of claim 9 further includes an image detector, and a lens of the image detector faces the temperature-sensitive and color-changing laminate.

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