Equipment for monitoring thermal expansion of epoxy resin adhesive in real time

Abstract

The utility model discloses equipment for monitoring thermal expansion of epoxy resin adhesive in real time, which comprises a closed container and a heating device, the heating device is used for heating a sample in the container, the container is filled with colored liquid, and the container can be used for monitoring liquid level change and temperature change; the liquid temperature monitoring device can monitor the temperature of liquid in real time, distilled water harmless to human bodies can be adopted as the liquid, the environment is not affected, and the liquid temperature monitoring device has the outstanding advantages of being simple, practical and easy to popularize.

Description

Technical Field

[0001] This utility model relates to the field of expansion monitoring equipment, and in particular to a device for real-time monitoring of the thermal expansion of epoxy resin adhesives. Background Technology

[0002] Epoxy resins possess excellent mechanical properties, dielectric properties, adhesive properties, and good process adaptability, making them widely used in various fields. However, the cured epoxy resin products are easily affected by temperature increases, causing thermal expansion changes. Therefore, it is essential to develop a convenient and simple instrument that can monitor the thermal expansion of epoxy resin adhesives in real time.

[0003] Since the 1970s, people abroad have been using capillary dilatometers to study the volume change of resin under the influence of temperature. The method to improve the accuracy of the dilatometer is to use mercury as the filling liquid. The resin is surrounded by liquid mercury, and the chemical changes of the resin cause changes in the mercury column in the capillary. The amount of change reflects the degree of resin volume change.

[0004] However, mercury is a highly toxic heavy metal pollutant, which limits the use of the device.

[0005] In the past decade, foreign countries have begun to use the buoyancy method to measure volume change. Specifically, the resin is placed in a soft, sealed bag (usually a PE bag or silicone rubber bag) and then suspended in the liquid. During the volume change, the density of the resin changes, but the density of the external liquid remains unchanged. The volume change will cause a change in buoyancy, and the volume change can be measured using Archimedes' principle. However, the buoyancy method is significantly affected by fluctuations in liquid density and environmental vibrations, resulting in a measurement error of more than ±5%, which cannot meet the requirements of high-precision monitoring. Utility Model Content

[0006] The purpose of this utility model is to provide a device for real-time monitoring of the thermal expansion of epoxy resin adhesives, which solves the safety and accuracy problems of existing monitoring devices for the thermal expansion of epoxy resin adhesives.

[0007] This invention is implemented as follows: a device for real-time monitoring of the thermal expansion of epoxy resin adhesives includes a sealed container and a heating device. The heating device is used to heat the sample inside the container. The container is filled with a harmless and environmentally friendly colored liquid. The liquid is used to reflect the thermal expansion of the sample through changes in its liquid level and to test the airtightness of the container. The container can be used to monitor changes in liquid level and temperature.

[0008] When the sample is placed in a container and heated, the expansion will cause the liquid level in the container to rise. Observe the degree of the rise in liquid level, according to the formula: [Liquid level rise volume (mm²)] 3 - Coefficient of liquid expansion (°C) -1 ) × original sample volume (mm3 ) × Temperature difference (°C) / (Original sample volume (mm³) 3 () × temperature difference (°C) = coefficient of thermal expansion (°C) -1 The thermal expansion parameters of the sample can be obtained by means of the liquid level rise; the volume of the liquid rise can be visually estimated, the original sample volume can be measured by the water displacement method, and the temperature difference can be measured by a thermometer. The liquid used is a harmless and environmentally friendly colored liquid. The liquid not only reflects the thermal expansion of the sample through changes in its liquid level, making it easy to observe, but also allows for verification of the container's airtightness. This invention can monitor liquid temperature in real time and has the outstanding advantages of being simple, practical, and easy to promote. Testing has shown that the measurement error of this device is less than ±1.5%, with good repeatability.

[0009] A further technical solution of this utility model is: the liquid includes distilled water, and red ink is added dropwise to the distilled water to enhance the visibility of liquid level changes and the airtightness of the testing device. Both distilled water and red ink are harmless to the human body, do not affect the environment, do not affect sample expansion, and are readily available.

[0010] A further technical solution of this utility model is: the container includes a wide-mouth bottle, a sealing plug, a pipette, and a thermometer. The sealing plug is placed on the top of the wide-mouth bottle to seal the wide-mouth bottle. One end of the thermometer and the graduated pipette passes through the sealing plug and can extend into the wide-mouth bottle.

[0011] Graduated pipettes can monitor changes in the liquid level in the container in real time, and thermometer readings can monitor the temperature of the liquid in the container in real time, making it convenient and easy to monitor the thermal expansion of epoxy resin adhesives in real time.

[0012] A further technical solution of this utility model is that both the pipette and the thermometer are sealed and connected to a sealing plug, ensuring the accuracy of the monitoring results.

[0013] A further technical solution of this utility model is: the container is a transparent cup with graduations, the top of the transparent cup is provided with a sealing plug, and a thermometer that can be inserted into the transparent cup is provided on the sealing plug.

[0014] The container is a graduated transparent cup, which makes it easier to read the expansion volume. The thermometer can monitor the temperature change of the liquid inside the container, making it easy to calculate the thermal expansion coefficient of the sample.

[0015] A further technical solution of this utility model is: the heating device includes a water bath, and the container is placed inside the water bath. By using a water bath, the container is placed inside, ensuring that the bottom and outer periphery of the container are at a uniform temperature, thus enabling thorough heating of the sample and avoiding uneven heating.

[0016] A further technical solution of this utility model is that the device also includes a mounting frame, which can be used to suspend the container on the heating device. Suspending the container on the mounting frame facilitates uniform heating of the sample inside the container, ensuring the expansion effect of the sample.

[0017] A further technical solution of this utility model is: the mounting frame includes a placement platform, a vertical frame and a horizontal frame connected in sequence, the heating device is placed on the placement platform, one end of the horizontal frame is adjustable from the vertical frame, and the other end of the horizontal frame is used to fix the container.

[0018] The crossbar is used to fix the container and place it in the heating device for heating. It has high stability and provides more uniform heating of the sample inside the container.

[0019] The beneficial effects of this invention are as follows: When a sample is placed in a container and heated, the expansion causes the liquid level in the container to rise. The degree of the rise is observed, and the result is calculated using the formula: [Liquid level rise volume (mm²)] 3 - Coefficient of liquid expansion (°C) -1 ) × original sample volume (mm 3 ) × Temperature difference (°C) / (Original sample volume (mm³) 3 () × temperature difference (°C) = coefficient of thermal expansion (°C) -1 The thermal expansion parameters of the sample can be obtained by means of this method. The volume of liquid rising can be visually estimated, the original sample volume can be measured by the water displacement method, and the temperature difference can be measured with a thermometer. The liquid used is a harmless and environmentally friendly colored liquid. The liquid not only reflects the thermal expansion of the sample through changes in its liquid level, making it easy to observe, but also allows for verification of the container's airtightness. This invention can monitor liquid temperature in real time and has the outstanding advantages of being simple, practical, and easy to promote. Testing has shown that the measurement error of this device is less than ±1.5%, with good repeatability.

[0020] This invention uses distilled water, which is harmless to the human body and does not affect the environment; sealing glue is wrapped around the connection between the pipette, thermometer and rubber stopper to ensure the airtightness of the device; adding red ink to the distilled water makes it easy to read the pipette reading and can also check the airtightness of the device; there is no need to measure the volume change through the change of buoyancy, the rise of the liquid level in the pipette can characterize the thermal expansion of epoxy resin adhesives; this invention has the outstanding advantages of being simple, practical and easy to promote. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a device for real-time monitoring of the thermal expansion of epoxy resin adhesives provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a device for real-time monitoring of the thermal expansion of epoxy resin adhesives provided in Embodiment 2 of this utility model.

[0023] Reference numerals: 1. Container, 11. Wide-mouth bottle, 12. Sealing plug, 13. Pipette, 14. Thermometer, 2. Heating device, 3. Sample, 4. Mounting rack, 41. Placement platform, 42. Vertical rack, 43. Horizontal rack. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0025] Example 1:

[0026] Figure 1 A device for real-time monitoring of the thermal expansion of epoxy resin adhesives is shown, comprising a sealed container 1 and a heating device 2. The heating device 2 is used to heat a sample 3 inside the container 1. The container 1 is filled with a harmless and environmentally friendly colored liquid. The liquid is used to reflect the thermal expansion of the sample through changes in its liquid level and to test the airtightness of the container. The container 1 can be used to monitor changes in liquid level and temperature.

[0027] When the sample is placed in a container and heated, the expansion will cause the liquid level in the container to rise. Observe the degree of the rise in liquid level, according to the formula: [Liquid level rise volume (mm²)] 3 - Coefficient of liquid expansion (°C) -1 ) × original sample volume (mm 3 ) × Temperature difference (°C) / (Original sample volume (mm³) 3 () × temperature difference (°C) = coefficient of thermal expansion (°C) -1 The thermal expansion parameters of the sample can be obtained by measuring the liquid level rise, which can be visually estimated, the original sample volume can be measured by the water displacement method, and the temperature difference can be measured with a thermometer. The liquid used is a harmless and environmentally friendly colored liquid. The liquid not only reflects the thermal expansion of the sample through changes in its liquid level, making it easy to observe, but also allows for verification of the container's airtightness. This invention can monitor liquid temperature in real time and has the outstanding advantages of being simple, practical, and easy to promote. Testing has shown that the measurement error of this device is less than ±1.5%, with good repeatability.

[0028] In this embodiment, the liquid includes distilled water, to which red ink is added dropwise to enhance the visibility of liquid level changes and the airtightness of the testing device. Both distilled water and red ink are harmless to humans, do not affect the environment, do not affect sample expansion, and are readily available.

[0029] In this embodiment, the container 1 includes a wide-mouth bottle 11, a sealing plug 12, a pipette 13, and a thermometer 14. The sealing plug 12 is placed on top of the wide-mouth bottle 11 to seal the wide-mouth bottle 11. The thermometer 14 and one end of the graduated pipette 13 pass through the sealing plug 12 and can extend into the wide-mouth bottle 11.

[0030] Graduated pipettes can monitor changes in the liquid level in the container in real time, and thermometer readings can monitor the temperature of the liquid in the container in real time, making it convenient and easy to monitor the thermal expansion of epoxy resin adhesives in real time.

[0031] In this embodiment, both the pipette 13 and the thermometer 14 are sealed to the sealing plug 12 to ensure the accuracy of the monitoring results.

[0032] In this embodiment, the heating device 2 includes a water bath, and the container 1 is placed inside the water bath. The use of a water bath ensures that the bottom and outer periphery of the container are at a uniform temperature, allowing for thorough heating of the sample and preventing uneven heating.

[0033] In this embodiment, the device further includes a mounting frame 4, which can be used to suspend the container 1 on the heating device 2. Suspending the container on the mounting frame facilitates uniform heating of the sample inside the container, ensuring the expansion effect of the sample.

[0034] In this embodiment, the mounting frame 4 includes a placement platform 41, a vertical frame 42, and a horizontal frame 43 connected in sequence. The heating device 2 is placed on the placement platform 41. One end of the horizontal frame 43 is adjustable from the vertical frame 42, and the other end of the horizontal frame 43 is used to fix the container 1.

[0035] The crossbar is used to fix the container and place it in the heating device for heating. It has high stability and provides more uniform heating of the sample inside the container.

[0036] In use, the sample is placed in a wide-mouthed bottle filled with distilled water. The bottle is placed on an iron stand with a water bath underneath. The bottle is sealed with a rubber stopper, which has two holes. One hole is for inserting a graduated pipette to record changes in the water level, and the other is for inserting a thermometer to monitor the temperature inside the bottle. To ensure the apparatus is airtight, sealant can be wrapped around the connections between the pipette, thermometer, and rubber stopper. To facilitate reading the pipette graduations, red ink can be added to the distilled water; the addition of red ink also serves to check the airtightness of the apparatus. The rise in the liquid level in the pipette characterizes the thermal expansion of the epoxy resin adhesive, i.e., [the volume of liquid level rise (mm²)]. 3 - Coefficient of liquid expansion (°C) -1 ) × original sample volume (mm 3) × Temperature difference (°C) / (Original sample volume (mm³) 3 () × temperature difference (°C) = coefficient of thermal expansion (°C) -1 The thermal expansion parameters of the sample can be obtained by means of the liquid level rise; the volume of the liquid rise can be visually estimated, the original sample volume can be measured by the water displacement method, and the temperature difference can be measured by a thermometer. The liquid used is a harmless and environmentally friendly colored liquid. The liquid not only reflects the thermal expansion of the sample through its level changes, making it easy to observe, but also allows for testing the airtightness of the container. This invention can monitor the liquid temperature in real time and has the outstanding advantages of being simple, practical, and easy to promote.

[0037] The three sets of parallel tests are shown in Table 1.

[0038] Table 1. Data on temperature and liquid level changes during the experiment.

[0039]

[0040] Tests have shown that the measurement error of this device is less than ±1.5%, and its repeatability is good.

[0041] Example 2:

[0042] Figure 2 A device for real-time monitoring of the thermal expansion of epoxy resin adhesives is shown, comprising a sealed container 1 and a heating device 2, wherein the heating device 2 is used to heat a sample 3 inside the container 1, the container 1 being filled with a colored liquid, and the container 1 being used to monitor changes in liquid level and temperature.

[0043] When the sample is placed in a container and heated, the expansion will cause the liquid level in the container to rise. Observe the degree of the rise in liquid level, according to the formula: [Liquid level rise volume (mm²)] 3 - Coefficient of liquid expansion (°C) -1 ) × original sample volume (mm 3 ) × Temperature difference (°C) / (Original sample volume (mm³) 3 () × temperature difference (°C) = coefficient of thermal expansion (°C) -1 The thermal expansion parameters of the sample can be obtained by measuring the liquid level rise, which can be visually estimated, the original sample volume can be measured by the water displacement method, and the temperature difference can be measured with a thermometer. The liquid used is a harmless and environmentally friendly colored liquid. The liquid not only reflects the thermal expansion of the sample through changes in its liquid level, making it easy to observe, but also allows for verification of the container's airtightness. This invention can monitor liquid temperature in real time and has the outstanding advantages of being simple, practical, and easy to promote. Testing has shown that the measurement error of this device is less than ±1.5%, with good repeatability.

[0044] In this embodiment, the liquid includes distilled water, to which red ink is added dropwise to enhance the visibility of liquid level changes and the airtightness of the testing device. Both distilled water and red ink are harmless to humans, do not affect the environment, do not affect sample expansion, and are readily available.

[0045] In this embodiment, the container 1 is a transparent cup with graduations, and the top of the transparent cup is provided with a sealing plug 12. The sealing plug 12 is provided with a thermometer 14 that can be inserted into the transparent cup.

[0046] The container is a graduated transparent cup, which makes it easier to read the expansion volume. The thermometer can monitor the temperature change of the liquid inside the container, making it easy to calculate the thermal expansion coefficient of the sample.

[0047] In this embodiment, the heating device 2 includes a water bath, and the container 1 is placed inside the water bath. The use of a water bath ensures that the bottom and outer periphery of the container are at a uniform temperature, allowing for thorough heating of the sample and preventing uneven heating.

[0048] In this embodiment, the device further includes a mounting frame 4, which can be used to suspend the container 1 on the heating device 2. Suspending the container on the mounting frame facilitates uniform heating of the sample inside the container, ensuring the expansion effect of the sample.

[0049] In this embodiment, the mounting frame 4 includes a placement platform 41, a vertical frame 42, and a horizontal frame 43 connected in sequence. The heating device 2 is placed on the placement platform 41. One end of the horizontal frame 43 is adjustable from the vertical frame 42, and the other end of the horizontal frame 43 is used to fix the container 1.

[0050] The crossbar is used to fix the container and place it in the heating device for heating. It has high stability and provides more uniform heating of the sample inside the container.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for monitoring in real time the thermal expansion of epoxy-based adhesives, comprising a closed container (1) and heating means (2) for heating a sample (3) inside the container (1), characterised in that: The container (1) is filled with a harmless and environmentally friendly colored liquid. The liquid is used to reflect the thermal expansion of the sample through changes in its liquid level and to test the airtightness of the container. The container (1) can be used to monitor changes in liquid level and temperature.

2. The device for monitoring thermal expansion of epoxy adhesive in real time according to claim 1, characterized in that: The liquid includes distilled water, to which red ink is added to enhance the visibility of liquid level changes and the airtightness of the testing device.

3. The device for monitoring thermal expansion of epoxy adhesive in real time according to claim 1, characterized in that: The container (1) includes a wide-mouth bottle (11), a sealing plug (12), a pipette (13), and a thermometer (14). The sealing plug (12) is placed on top of the wide-mouth bottle (11) to seal the wide-mouth bottle (11). One end of the thermometer (14) and the graduated pipette (13) passes through the sealing plug (12) and can extend into the wide-mouth bottle (11).

4. The device for monitoring thermal expansion of epoxy adhesive in real time according to claim 3, characterized in that: The pipette (13) and thermometer (14) are both sealed to the sealing plug (12).

5. The apparatus for monitoring thermal expansion of epoxy adhesive in real time according to claim 1, wherein: The container (1) is a graduated transparent cup with a sealing plug (12) on the top of the transparent cup, and a thermometer (14) that can be inserted into the transparent cup is provided on the sealing plug (12).

6. The apparatus for monitoring thermal expansion of epoxy-based adhesives in real time according to claim 1, wherein: The heating device (2) includes a water bath, and the container (1) is placed inside the water bath.

7. The apparatus for monitoring thermal expansion of epoxy-based adhesives in real time according to claim 1, wherein: The device also includes a mounting frame (4), which can be used to suspend the container (1) on the heating device (2); the mounting frame (4) includes a placement platform (41), a vertical frame (42) and a horizontal frame (43) connected in sequence, the heating device (2) is placed on the placement platform (41), one end of the horizontal frame (43) is adjustable from the vertical frame (42), and the other end of the horizontal frame (43) is used to fix the container (1).

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