A composite high-efficiency vacuum defoaming device for production of conductive silver paste

Abstract

The utility model provides a kind of composite high-efficiency vacuum defoaming device for conductive silver paste production, belong to electronic material preparation equipment technical field.Defoaming device includes defoaming container, defoaming assembly and first driving part.Defoaming container has defoaming cavity.Defoaming assembly is set in defoaming cavity, defoaming assembly includes rotating shaft, first defoaming part, second defoaming part and third defoaming part, first defoaming part can be attached with the inside wall of defoaming container bottom, second defoaming part includes stirring frame, third defoaming part includes broken disc and broken needle, rotating shaft is worn in broken disc, multiple broken needles are distributed on broken disc, broken needle and broken disc cross arrangement.First driving part is set in defoaming container, first driving part is configured as driving rotating shaft rotation, to drive first defoaming part, second defoaming part and third defoaming part rotation, in turn, disturb conductive silver paste.The defoaming device of the utility model can improve the defoaming effect of conductive silver paste.

Description

Technical Field

[0001] This utility model relates to the field of electronic material preparation equipment technology, and in particular to a composite high-efficiency vacuum degassing device for the production of conductive silver paste. Background Technology

[0002] Conductive silver paste is a key functional material in electronic components, photovoltaic cells, and other fields, and its performance greatly affects the conductivity and reliability of the products. Air bubbles are one of the key defects affecting the quality of silver paste, leading to problems such as broken printed circuit lines, increased resistivity, and poor product consistency.

[0003] In related technologies, the degassing process in the production of conductive silver paste mainly adopts the following methods:

[0004] 1. Planetary agitation degassing: This method uses a double planetary agitator to degas the paste under vacuum through a combination of revolution and rotation. It is effective for medium-viscosity pastes, but for ultra-high viscosity silver pastes, the path for bubbles to reach the surface is long, resulting in poor efficiency and high energy consumption.

[0005] 2. Simple vacuum degassing: The silver paste is placed in a vacuum chamber and a vacuum is created, relying on the pressure difference to cause the bubbles to expand and burst. This method has simple equipment, but its effect on microbubbles that are firmly encapsulated and have high surface tension is limited, and it is time-consuming.

[0006] 3. Chemical defoamers: These reduce surface tension and cause bubbles to burst. However, the introduction of chemical defoamers may introduce impurities, affecting the purity and long-term conductivity stability of the silver paste, and is not suitable for all high-end applications.

[0007] 4. Other mechanical methods: scraping and vibration mixing are used, but the former has a complex structure and the latter may cause silver powder to settle due to vibration, resulting in uniformity problems.

[0008] In summary, existing technologies all have certain limitations. An ideal, highly efficient degassing device should be able to quickly and thoroughly eliminate bubbles of various sizes while avoiding the introduction of foreign substances, and should also be energy efficient, easy to operate, and adaptable to the characteristics of high-viscosity silver paste. Therefore, the development of a specialized device that combines multiple degassing mechanisms and intelligent control is urgently needed. Utility Model Content

[0009] This invention provides a composite high-efficiency vacuum degassing device for the production of conductive silver paste, the purpose of which is to improve the degassing effect of conductive silver paste.

[0010] To achieve the above objectives, this utility model provides a composite high-efficiency vacuum degassing device for the production of conductive silver paste, comprising:

[0011] A degassing container having a degassing chamber containing conductive silver paste to be degassed;

[0012] A degassing assembly is disposed within the degassing chamber. The degassing assembly includes a rotating shaft, a first degassing component, a second degassing component, and a third degassing component. The axial direction of the rotating shaft is parallel to the vertical direction. The first, second, and third degassing components are sequentially connected to the rotating shaft along its axial direction. The first degassing component can fit against the inner wall of the bottom of the degassing container. The second degassing component includes a stirring frame, through which the rotating shaft passes. The third degassing component includes a crushing disc and crushing needles. The rotating shaft passes through the crushing disc. There are multiple crushing needles distributed on the crushing disc, and the crushing needles are arranged intersectingly with the crushing disc.

[0013] A first driving member is disposed in the degassing container. The first driving member is configured to drive the rotating shaft to rotate, thereby causing the first degassing member, the second degassing member and the third degassing member to rotate, thereby agitating the conductive silver paste.

[0014] In one embodiment, the degassing device includes a second driving member disposed on the side of the first driving member away from the degassing component. The second driving member is configured to drive the first driving member to move along the vertical direction, thereby causing the degassing component to move along the vertical direction.

[0015] In one embodiment, the degassing device includes a heating assembly and a jacket. The heating assembly includes a heater and a circulation pump. The jacket covers the degassing container and has a variable temperature channel surrounding the degassing container. The circulation pump is connected to the variable temperature channel to drive a heating liquid to circulate within the variable temperature channel. The heater is configured to heat the heating liquid.

[0016] In one embodiment, the degassing device includes a vacuum assembly, which includes a vacuum pump and a vacuum pipeline. The degassing container has an exhaust port communicating with the degassing chamber. The exhaust port is at a height higher than the level of the conductive silver paste in the vertical direction. A first end of the vacuum pipeline is connected to the exhaust port, and a second end of the vacuum pipeline is connected to the vacuum pump to maintain the vacuum state of the degassing chamber.

[0017] In one embodiment, the inner wall of the degassing container is configured as a smooth surface.

[0018] In one embodiment, the defoaming device includes a defoaming component connected to the defoaming container. When the defoaming rate of the conductive silver paste is lower than a threshold, the defoaming component can spray a defoaming agent for defoaming into the defoaming chamber.

[0019] In one embodiment, the material of the breaking needle is configured as Teflon or stainless steel.

[0020] The above-mentioned solution of this utility model has the following beneficial effects:

[0021] In this embodiment, when the first driving member drives the rotating shaft to rotate, it in turn drives the degassing component to rotate to degas the conductive silver paste. The first degassing component, located at the bottom, adheres closely to the bottom of the inner wall of the degassing container and the arc-shaped areas on both sides of the bottom, forcibly scraping away bubbles attached to the wall surface and reducing the possibility of conductive silver paste remaining at the bottom of the degassing chamber. The second degassing component, located in the middle, includes a stirring frame that can gently agitate the conductive silver paste and create an upward path for bubbles in the conductive silver paste. The third degassing component, located at the top, has a breaking needle that can accurately puncture bubbles that have risen to the surface of the conductive silver paste or are suspended in the conductive silver paste. The degassing component of this application can simultaneously act on bubbles of different positions and sizes, allowing the degassing component to agitate the conductive silver paste in multiple dimensions, significantly shortening the degassing time, and effectively handling high-viscosity silver paste and difficult-to-eliminate microbubbles, thus improving the degassing effect of the degassing device. Furthermore, this application reduces the reliance on chemical defoamers by improving the structure of the defoaming component, which helps to meet the stringent purity requirements of high-end conductive silver paste.

[0022] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the degassing device in one embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the degassing component in one embodiment of the present invention.

[0025] [Explanation of Labels in the Attached Image]

[0026] 1. Degassing container; 11. Degassing chamber; 2. Degassing assembly; 21. Rotating shaft; 22. First degassing component; 23. Second degassing component; 231. Stirring frame; 24. Third degassing component; 241. Crushing disc; 242. Crushing needle; 3. First driving component; 4. Second driving component; 5. Heating assembly; 51. Heater; 52. Circulating pump; 6. Jacket; 7. Vacuum assembly; 71. Vacuum pump; 72. Vacuum pipeline; 8. Defoaming assembly. Detailed Implementation

[0027] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figure 1 and Figure 2 This application provides a composite high-efficiency vacuum degassing device for the production of conductive silver paste, including a degassing container 1, a degassing component 2 and a first driving component 3.

[0031] The degassing container 1 can be a closed pressure vessel. The degassing container 1 has a degassing chamber 11, which contains conductive silver paste to be degassed.

[0032] A degassing assembly 2 is disposed within the degassing chamber 11 and is used to agitate the conductive silver paste to promote degassing. The degassing assembly 2 includes a rotating shaft 21, a first degassing element 22, a second degassing element 23, and a third degassing element 24. The axial direction of the rotating shaft 21 is parallel to the vertical direction. The first degassing element 22, the second degassing element 23, and the third degassing element 24 are sequentially connected to the rotating shaft 21 along its axial direction. For example, please refer to... Figure 1 and Figure 2The first degassing component 22, the second degassing component 23, and the third degassing component 24 are arranged sequentially from bottom to top.

[0033] The first driving element 3 is disposed in the degassing container 1. The first driving element 3 is configured to drive the rotating shaft 21 to rotate, thereby causing the first degassing element 22, the second degassing element 23, and the third degassing element 24 to rotate, thereby enabling the degassing assembly 2 to agitate the conductive silver paste. For example, the first driving element 3 can be a motor, and the output shaft of the motor is fixedly connected to the rotating shaft 21.

[0034] The first degassing component 22 can conform to the inner wall of the bottom of the degassing container 1. For example, the first degassing component 22 can be a scraper, shaped like an anchor. The scraper can closely adhere to the bottom of the inner wall of the degassing container 1 and the arc-shaped areas on both sides of the bottom. When the scraper rotates, it can forcibly scrape off the air bubbles attached to the wall surface and reduce the possibility of conductive silver paste remaining at the bottom of the degassing chamber 11. The second degassing component 23 includes a stirring frame 231, through which a rotating shaft 21 passes. For example, the second degassing component 23 also includes a connector for connecting the stirring frame 231 to the rotating shaft 21. When the stirring frame 231 rotates, it can gently agitate the conductive silver paste and create an upward path for the air bubbles in the conductive silver paste. The third degassing component 24 includes a breaking disc 241 and a breaking needle 242. The rotating shaft 21 passes through and is fixedly connected to the crushing disc 241. Multiple crushing needles 242 are distributed on the crushing disc 241, arranged crisscrossingly with the disc, for example, they can be arranged perpendicularly. When the third degassing element 24 rotates, the crushing needles 242 can accurately puncture bubbles that rise to the surface of the conductive silver paste or are suspended in the conductive silver paste.

[0035] In this embodiment, when the first driving member 3 drives the rotating shaft 21 to rotate, it in turn drives the degassing component 2 to rotate to degas the conductive silver paste. The first degassing member 22, located at the bottom, adheres closely to the bottom of the inner wall of the degassing container 1 and the arc-shaped areas on both sides of the bottom, forcibly scraping away bubbles attached to the wall surface and reducing the possibility of conductive silver paste remaining at the bottom of the degassing chamber 11. The second degassing member 23, located in the middle, includes a stirring frame 231, which can gently agitate the conductive silver paste and create an upward path for bubbles in the conductive silver paste. The third degassing member 24, located at the top, has a breaking needle 242 that can accurately puncture bubbles that have risen to the surface of the conductive silver paste or are suspended in the conductive silver paste. The degassing component 2 of this application can simultaneously act on bubbles of different positions and sizes, allowing the degassing component 2 to agitate the conductive silver paste in multiple dimensions, significantly shortening the degassing time, and effectively handling high-viscosity silver paste and difficult-to-eliminate microbubbles, thus improving the degassing effect of the degassing device. Furthermore, this application reduces the reliance on chemical defoamers by improving the structure of the defoaming component 2, which helps to meet the stringent purity requirements of high-end conductive silver paste.

[0036] In one embodiment, please refer to Figure 1 The degassing device includes a second driving member 4, which is located on the side of the first driving member 3 away from the degassing component 2. The second driving member 4 is configured to drive the first driving member 3 to move vertically, thereby causing the degassing component 2 to move vertically. For example, the second driving member 4 can be a linear motor or a lead screw-slider mechanism driven by a servo motor, to drive the first driving member 3 to move vertically up and down, thereby causing the degassing component 2 to move up and down. This allows the degassing component 2 to agitate a larger area of ​​conductive silver paste in the vertical direction, which is beneficial for improving the degassing effect of the degassing device.

[0037] In one embodiment, please refer to Figure 1 The degassing device includes a heating assembly 5 and a jacket 6. The heating assembly 5 includes a heater 51 and a circulation pump 52. The jacket 6 surrounds the degassing container 1 and has a variable temperature channel that surrounds the degassing container 1. The circulation pump 52 is connected to the variable temperature channel to drive the heating liquid to circulate within the variable temperature channel. The heater 51 is configured to heat the heating liquid. For example, the heating liquid can be heated oil, which can be heated by the heater 51. When the heated oil circulates within the variable temperature channel driven by the circulation pump 52, it transfers its heat through the degassing container 1 to the conductive silver paste, providing gentle and uniform heating to the conductive silver paste. This reduces the viscosity of the conductive silver paste, decreases the surface tension of the bubbles in the conductive silver paste, and promotes the expansion and floating of the bubbles, thereby improving the degassing effect of the conductive silver paste.

[0038] In one embodiment, please refer to Figure 1The degassing device includes a vacuum assembly 7. The vacuum assembly 7 includes a vacuum pump 71 and a vacuum line 72. The degassing container 1 has an extraction port communicating with the degassing chamber 11. The extraction port is vertically higher than the surface of the conductive silver paste to reduce the possibility of leakage of the conductive silver paste through the extraction port. A first end of the vacuum line 72 is connected to the extraction port, and a second end of the vacuum line 72 is connected to the vacuum pump 71 to maintain the vacuum state of the degassing chamber 11. For example, the vacuum assembly 7 may also include a vacuum valve and a vacuum gauge to stabilize and test the vacuum state within the degassing chamber 11. The degassing chamber 11 can maintain a high vacuum of -0.098 MPa or higher. When the degassing chamber 11 is under vacuum, bubbles in the conductive silver paste are more likely to detach from the conductive silver paste under the influence of the pressure difference, which is beneficial for improving the degassing effect of the conductive silver paste.

[0039] In one embodiment, the inner wall of the degassing container 1 is configured with a smooth surface. For example, the inner wall of the degassing container 1 can be mirror-polished to reduce the likelihood of bubbles adhering to the inner wall of the degassing container 1, thereby increasing the likelihood of bubbles detaching from the conductive silver paste.

[0040] In one embodiment, please refer to Figure 1 The defoaming device includes a defoaming component 8, which is connected to the defoaming container 1. When the defoaming rate of the conductive silver paste is lower than a threshold, the defoaming component 8 can spray a defoaming agent for defoaming into the defoaming chamber 11. For example, a small amount of chemical defoamer can be sprayed in to assist defoaming, accelerating the defoaming speed with almost no impact on the purity of the conductive silver paste.

[0041] In one embodiment, the material of the breaker needle 242 is configured as Teflon or stainless steel. Breaker needles 242 made of Teflon or stainless steel have strong stability and corrosion resistance, which is beneficial to improving the service life of the breaker needle 242.

[0042] For example, before the degassing device is in operation, a predetermined amount of conductive silver paste can be added through the feeding port at the top of the degassing container 1. When the degassing device is started, the heating component 5 can be activated first to preheat the conductive silver paste to a preset temperature (e.g., 50-60°C) to reduce the viscosity of the conductive silver paste. Subsequently, the vacuum component 7 is activated to evacuate the vacuum in the degassing chamber 11 to a preset value (e.g., -0.095MPa) so that the conductive silver paste tends to escape outward under the action of pressure difference.

[0043] Then, the degassing component 2 is activated, and the first driving component 3 drives the rotating shaft 21 to rotate at a preset speed. The first degassing component 22, which acts as a scraper, removes air bubbles from the wall surface, the stirring frame 231 of the second degassing component 23 gently agitates the conductive silver paste, and the breaking needle 242 of the third degassing component 24 rotates at high speed to puncture the surface air bubbles of the conductive silver paste.

[0044] If the defoaming rate of the conductive silver paste is detected to be lower than expected (e.g., by judging from the vacuum degree change curve), the defoaming component 8 can be activated to spray in a small amount of defoamer to assist in defoaming.

[0045] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A composite high-efficiency vacuum degassing device for the production of conductive silver paste, characterized in that, include: A degassing container having a degassing chamber containing conductive silver paste to be degassed; A degassing assembly is disposed within the degassing chamber. The degassing assembly includes a rotating shaft, a first degassing component, a second degassing component, and a third degassing component. The axial direction of the rotating shaft is parallel to the vertical direction. The first, second, and third degassing components are sequentially connected to the rotating shaft along its axial direction. The first degassing component can fit against the inner wall of the bottom of the degassing container. The second degassing component includes a stirring frame, through which the rotating shaft passes. The third degassing component includes a crushing disc and crushing needles. The rotating shaft passes through the crushing disc. There are multiple crushing needles distributed on the crushing disc, and the crushing needles are arranged intersectingly with the crushing disc. A first driving member is disposed in the degassing container. The first driving member is configured to drive the rotating shaft to rotate, thereby causing the first degassing member, the second degassing member and the third degassing member to rotate, thereby agitating the conductive silver paste.

2. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, characterized in that, The degassing device includes a second driving member, which is disposed on the side of the first driving member away from the degassing component. The second driving member is configured to drive the first driving member to move along the vertical direction, thereby causing the degassing component to move along the vertical direction.

3. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, characterized in that, The degassing device includes a heating assembly and a jacket. The heating assembly includes a heater and a circulation pump. The jacket covers the degassing container and has a variable temperature channel surrounding the degassing container. The circulation pump is connected to the variable temperature channel to drive the heating liquid to circulate within the variable temperature channel. The heater is configured to heat the heating liquid.

4. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, characterized in that, The degassing device includes a vacuum assembly, which includes a vacuum pump and a vacuum pipeline. The degassing container has an air extraction port that communicates with the degassing chamber. The air extraction port is at a height higher than the height of the conductive silver paste liquid surface in the vertical direction. The first end of the vacuum pipeline is connected to the air extraction port, and the second end of the vacuum pipeline is connected to the vacuum pump to maintain the vacuum state of the degassing chamber.

5. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, characterized in that, The inner wall of the degassing container is configured as a smooth surface.

6. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, characterized in that, The defoaming device includes a defoaming component connected to the defoaming container. When the defoaming rate of the conductive silver paste is lower than a threshold, the defoaming component can spray a defoaming agent for defoaming into the defoaming chamber.

7. The composite high-efficiency vacuum degassing device for producing conductive silver paste according to claim 1, wherein the material of the crushing needle is configured as Teflon or stainless steel.

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