Manufacturing method of shielding unit and shielding unit

Abstract

The invention provides a manufacturing method of a shielding unit and the shielding unit, and relates to the technical field of electronic product processing. The manufacturing method of the shielding unit comprises the steps that according to foam material parameters of foam and nano material parameters of a nano conductive wire, the soaking frequency of the foam when the conductive condition is met is determined; preparing a nano conductive solution according to the nano conductive wire; soaking the foam in the nano conductive solution; taking out and drying the foam meeting the conductive condition, and skipping to the step of soaking the foam in the nano conductive solution until the conductivity of the foam meets the conductive condition; and under the condition that the soaking times of the foam reach the soaking times, obtaining a shielding unit according to the foam and a preset conductive cloth layer. Through multiple times of soaking and in each soaking process, it is ensured that the conductive condition can be met, and then it can be further ensured that the conductive performance of the foam meets the conductive condition. And the conductive cloth layer is combined to ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirement.

Description

Technical Field

[0001] The embodiments of the present application relate to but are not limited to the field of electronic product processing technology, and in particular, to a manufacturing method of a shielding unit and the shielding unit. Background Art

[0002] Shielding units are often used in electronic products for electromagnetic shielding and heat dissipation to ensure the performance of electronic products. However, with the miniaturization, high integration and high frequency of electronic products, the heat accumulation and electromagnetic interference problems inside electronic products are becoming increasingly serious. Therefore, how to ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirements is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of the claims. The embodiments of the present application provide a method for manufacturing a shielding unit and a shielding unit, which can ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirements.

[0004] In a first aspect, a method for manufacturing a shielding unit according to an embodiment of the present application includes:

[0005] Determining foam material parameters of the foam and nano material parameters of the nano conductive wire;

[0006] Determining the number of times the foam is immersed when the conductive condition is met according to the foam material parameters and the nano material parameters;

[0007] According to the nano-conductive wires, preparing a nano-conductive solution;

[0008] Soaking the foam in the nano-conductive solution until the conductive property of the foam meets the conductive condition;

[0009] The foam that meets the conductive condition is taken out and dried, and the process proceeds to the step of soaking the foam in the nano conductive solution until the conductive property of the foam meets the conductive condition;

[0010] When the number of times the foam is soaked reaches the number of times, a shielding unit is obtained according to the foam and the preset conductive cloth layer.

[0011] In a second aspect, according to the shielding unit proposed in the embodiment of the present application, the shielding unit is manufactured by the method described in the first aspect.

[0012] The above-mentioned embodiments of the present application have at least the following beneficial effects: by determining the number of immersions based on the foam material parameters and the nanomaterial parameters of the nano-conductive wire, and ensuring that the conductive conditions are met during each immersion process, at this time, after the immersion times, it can be further ensured that the conductive performance of the foam meets the conductive conditions. At the same time, the conductivity can be further increased by adding a conductive cloth layer. Therefore, compared with the related art, the embodiments of the present application can ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0014] Figure 1 It is a schematic diagram of a process of manufacturing a shielding unit provided by the present application;

[0015] Figure 2 It is a structural schematic diagram of the shielding unit provided by the present application;

[0016] Figure 3 This is a process of manufacturing a shielding unit according to an embodiment of the method for manufacturing a shielding unit provided in the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art belonging to the technical field of the present application. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application. The terms "first", "second", "third", "fourth", etc. (if present) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order.

[0019] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0020] In electronic products, shielding units are often used for electromagnetic shielding and heat dissipation to ensure the performance of electronic products. However, with the miniaturization, high integration and high frequency of electronic products, the heat accumulation and electromagnetic interference problems inside electronic products are becoming increasingly serious. Among them, for the shielding unit, the main electromagnetic shielding effect is produced by foam, and in the production process, the conductivity of the foam is obtained by soaking in a conductive solution. If the soaking time is not long enough, the conductivity of the foam will not meet the conductive conditions, and in the process of drying the foam, some of the conductivity will be lost. Therefore, in the related art, the accuracy of the conductive performance of the foam is difficult to ensure during the processing and production process, which leads to the electromagnetic shielding performance of the shielding unit failing to meet the requirements. In summary, how to ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirements is a technical problem that needs to be solved urgently. Based on this, the embodiment of the present application provides a method for manufacturing a shielding unit and a shielding unit, which can ensure that the electromagnetic shielding performance of the shielding unit meets the shielding requirements.

[0021] According to a method for manufacturing a shielding unit provided in an embodiment of the present application, the manufacturing method includes:

[0022] Step S100, determining the foam material parameters of the foam and the nano material parameters of the nano conductive wire;

[0023] Step S200, determining the number of times the foam is immersed when the conductive condition is met according to the foam material parameters and the nano material parameters;

[0024] Step S300, preparing a nano conductive solution according to the nano conductive wires;

[0025] Step S400, soaking the foam in a nano-conductive solution until the conductive property of the foam meets the conductive condition;

[0026] Step S500, taking out the foam that meets the conductive condition and drying it, and then jumping to the step of soaking the foam in a nano conductive solution until the conductive property of the foam meets the conductive condition;

[0027] Step S600: When the number of times the foam is soaked reaches the soaking number, a shielding unit is obtained according to the foam and the preset conductive cloth layer.

[0028] Therefore, by determining the number of immersions based on the foam material parameters and the nanomaterial parameters of the nano-conductive wire, and ensuring that the conductive conditions are met during each immersion process, at this time, after the immersion times, it can be further ensured that the conductive performance of the foam meets the conductive conditions. At the same time, the conductivity can be further increased by adding a conductive fabric layer. Therefore, the method of the embodiment of the present application can ensure that the electromagnetic shielding performance of the manufactured shielding unit meets the shielding requirements.

[0029] It is understandable that the embodiment of the present application does not limit the type of foam, and ultra-soft foam can be selected so that the shielding sheet will not be damaged when deformation occurs.

[0030] It is understandable that the foam material parameters reflect the ability of the foam to absorb nano-conductive molecules. In some embodiments, step S100 can manually select the models of foam and nano-conductive wire to determine the foam material parameters and nano-material parameters. In other embodiments, it is also possible to select one from a plurality of types of foam and nano-conductive materials based on the shielding performance requirements of the electronic products used by the shielding unit and the historical shielding performance data collected, and obtain the foam material parameters of the selected foam and the nano-material parameters of the nano-conductive material. In this regard, the embodiment of the present application does not limit how step S100 is determined.

[0031] It is understandable that the nano-conductive solution is used to fully fuse the nano-conductive molecules and the foam in the nano-conductive wires, and those skilled in the art can selectively set the capacity, concentration and volume of the nano-conductive solution according to actual needs.

[0032] The conductive condition is the conductive performance of the foam when the shielding performance of the electronic product is met. The conductive performance can be evaluated by resistance, and accordingly, the conductive condition is that the resistance is less than a preset threshold.

[0033] It is understandable that the electrical conductivity of the foam meets the electrical conductivity condition by taking out the foam for measurement, or directly measuring the foam in the nano-conductive solution. In other embodiments, a fixed time period may also be set to ensure that the electrical conductivity of the foam meets the electrical conductivity condition.

[0034] It is understandable that the nano-conductive wires may be replenished after each soaking, or may be replenished all at once, and this is not limited in the embodiments of the present application.

[0035] It is understandable that the conductive cloth layer is conductive and can protect the foam. By adding the conductive cloth layer, the service life of the shielding unit can be increased.

[0036] Therefore, by soaking for multiple times and satisfying the conductive condition each time, the conductive properties of the foam after drying can be controlled more accurately.

[0037] It is understandable that the embodiments of the present application do not impose any restrictions on the drying temperature or the drying time, and those skilled in the art can determine the drying time and temperature based on production efficiency.

[0038] It is understandable that the conductive property is set as a resistance value, and the conductive condition is that the resistance value is less than a preset resistance threshold value; according to the foam material parameters and the nanomaterial parameters, the number of times the foam is immersed when the conductive condition is met is determined, including:

[0039] Obtaining a times resistance mapping table that matches both the foam material parameters and the nano material parameters, wherein different times resistance mapping tables are used to record the relationship between each immersion times, each nano material parameter and the resistance value of the foam under different foam material parameters;

[0040] Determine the physical parameters of nano-conductive wires;

[0041] According to the resistance threshold and the physical parameters, the number of immersion times is obtained by searching in a matching resistance mapping table.

[0042] Therefore, by providing multiple times resistance mapping tables, the processing efficiency of the foam can be improved during the actual production process.

[0043] It can be understood that the physical parameters reflect the physical characteristics of the nano conductive wires, such as wire diameter, field, and the like.

[0044] The resistance mapping table provides a more accurate soaking number, which can further improve the efficiency of production and processing.

[0045] For example, taking the nano-conductive wire as a silver wire as an example, the secondary resistance mapping table is shown in Table 1 below:

[0046]

[0047] Table 1

[0048] Among them, as shown in Table 1 above, for the foam material parameters in Table 1, when the physical parameters of the selected silver wire have a wire diameter of 50 to 100 nm and a field value of 20 to 70 um, when the resistance threshold is set to 1.3 Ω, the number of times corresponding to the minimum resistance when the resistance threshold is greater than the resistance threshold, that is, 5 times corresponding to <1.3 Ω, can be selected as the number of immersion times. At this time, only 5 immersions are required, and each immersion is completed and the foam is taken out and dried when the resistance value reaches 1.3 Ω, and a foam that meets the conductive properties can be obtained.

[0049] It is understandable that the secondary resistance mapping table is determined by the following steps:

[0050] Obtaining nanomaterial parameters of nanoconductive materials that can be used to prepare nanoconductive solutions, wherein the nanomaterial parameters include conductive material types and physical parameters;

[0051] The resistance of foam with the same foam material parameters and nano-conductive solutions of nano-conductive materials with different physical parameters and different conductive material types were verified for different soaking times;

[0052] Based on the foam material parameters and the conductive material type, the resistance verification results are classified to obtain a plurality of order resistance mapping tables, so that each order resistance mapping table corresponds to a combination of a foam material parameter and a conductive material type.

[0053] By constructing nanomaterial parameters based on the combination of foam material parameters and a conductive material type, the efficiency of obtaining the number of immersion times can be improved.

[0054] For example, if the conductive material types are A, B, C, and D, and the material parameters of the foam are P1, P2, and P3, then the relationship between the number of immersion times under various physical parameters that satisfy A and P1 and the resistance of the foam after drying can be obtained, and the relationship between the number of immersion times under various physical parameters that satisfy B and P1 and the resistance of the foam after drying can also be obtained. The relationship between the number of immersion times under various physical parameters that satisfy C and P1 and the resistance of the foam after drying can also be obtained. The relationship between the number of immersion times under various physical parameters that satisfy D and P1 and the resistance of the foam after drying can also be obtained, and so on, so that multiple relationships such as Figure 1 The secondary resistance mapping table is shown.

[0055] It is understood that, according to the nano-conductive wires, the nano-conductive solution is formulated, including:

[0056] Obtaining the total mass of the nano-conductive solution to be prepared;

[0057] According to a preset mass ratio, determining a first mass of anhydrous ethanol and a second mass of the nano conductive wire;

[0058] A first mass of anhydrous ethanol and a second mass of nano-conductive wires are mixed to obtain a nano-conductive solution.

[0059] It is understandable that anhydrous ethanol has good reducibility. For example, if the nano-conductive wire is a silver wire, the AgNO3 of the nano-conductive wire can be reduced to nano-silver particles. Secondly, anhydrous ethanol can also prevent the molecular particles reduced by the nano-conductive wire from agglomerating (such as agglomerating silver nano-molecular particles), thereby maintaining its dispersibility. And anhydrous ethanol can also adjust the reaction temperature and the reaction rate during the reaction. Therefore, by mixing anhydrous ethanol and nano-conductive wire, the duration of each soaking of the foam can be shortened, thereby improving the efficiency of production and processing.

[0060] It is understandable that, according to the foam and the preset conductive cloth layer, a shielding unit is obtained, including:

[0061] A heat conducting layer is provided on opposite sides of the two conductive cloth layers;

[0062] The shielding unit is obtained by bonding the foam between two conductive cloth layers printed with the heat conductive layer.

[0063] It is understandable that the embodiments of the present application do not limit the material of the thermal conductive layer. In some embodiments, the thermal conductive layer can be set to graphene, so as to utilize the good thermal conductivity of graphene so that the shielding unit meets both thermal conductivity and electrical conductivity conditions.

[0064] For example, refer to Figure 2 As shown, from top to bottom, the shielding sheet is composed of a conductive cloth layer, a thermal conductive layer, a foam, a thermal conductive layer and a conductive cloth layer.

[0065] It is understandable that the embodiment of the present application does not limit the structure formed by the shielding unit, which can be set to a sheet or a cavity, etc., and can be used in combination of multiple shielding units or a single shielding unit.

[0066] It is understood that the thickness of the thermal conductive layer is determined by the following steps:

[0067] Obtain a thickness thermal conductivity mapping table, which records the thermal conductivity of foams with different thicknesses of thermal conductive layers;

[0068] Determine the thickness of the thermal conductive layer according to the thickness thermal conductivity mapping table and the installation dimensions of the shielding unit.

[0069] It is understandable that, in some embodiments, the thermal conductivity of the heat-conducting layer with different thicknesses may be measured to obtain a thickness thermal conductivity mapping table, as shown in Table 2 below:

[0070]

[0071] Table 2

[0072] At this time, referring to Table 2, within a certain thickness range, the thickness of the thermal conductive layer is independent of the thermal conductivity. Therefore, according to Table 2, when the thermal conductivity is independent of the thickness, the thickness of the thermal conductive layer can be determined according to the installation size of the shielding unit.

[0073] In other embodiments, due to the different materials of the thermal conductive layer, the thickness is strongly correlated with the thermal conductivity. In this case, the thickness range that meets the thermal conductivity conditions can be screened out through a thickness thermal conductivity mapping table, and then the thickness of the thermal conductive layer can be determined from the thickness range based on the installation size.

[0074] It is understood that the method further comprises:

[0075] For the first processed foam under the same foam material parameters, after the foam is immersed in the nano conductive solution, the immersion time of the foam is counted and the conductive performance of the foam is measured multiple times. When the conductive performance reaches the conductive condition, the counted time is used as the immersion time of the current immersion, and the immersion time of each immersion is obtained;

[0076] The duration of each soaking is used to determine whether the conductive properties of the foam processed after the first one under the same foam material parameters meet the conductive conditions.

[0077] By using the same nano-conductive solution and the same number of immersions to count the immersion time of each immersion of the first processed foam, when the same type of foam is subsequently immersed, it is possible to directly determine whether the conductive performance meets the conductive conditions based on the immersion time.

[0078] For example, assuming that foams 1 to n with the same foam material parameters are to be processed separately, and assuming that the foams with the same foam material parameters have never been processed, then for the first foam 1 to be processed, when executing step S400, the soaking time of the foam can be counted and the conductive properties of the foam can be measured multiple times. When the conductive properties meet the conductive conditions, the counted time can be used as the soaking time of the current soaking to obtain the soaking time of each soaking. At this time, for foams 2 to n, in subsequent processing, the soaking time of each soaking of foam 1 can be referred to to determine whether its conductive properties meet the conductive conditions, so that the conductive properties do not need to be measured frequently in the subsequent foam production process, or only need to be measured after the soaking time is reached, and the operation is more convenient.

[0079] It is understood that the foam material parameters include at least one of density, soaking swelling ratio and thickness.

[0080] It is understandable that the nanomaterial parameters include conductive material types and physical parameters; the conductive material types include nano-gold wires, nano-silver wires and nano-copper wires, and the physical parameters include at least one of wire diameter and wire length.

[0081] Exemplarily, the following describes a method for manufacturing a shielding unit according to an embodiment of the present application, and reference is made to Figure 3 As shown, taking the nano conductive wire as a silver wire as an example, the specific steps are as follows:

[0082] Step S1: Prepare nano-conductive solution. For details, please refer to Figure 1 In step S100, the nanomaterial parameters are determined, and nano conductive wires and anhydrous ethanol are mixed in a mass ratio of 50% to prepare a nano conductive solution.

[0083] Step S2: soaking the foam in the nano-conductive solution.

[0084] Step S3: Take out the foam that meets the conductive conditions and put it into an oven, and bake it at 60° C. for one hour.

[0085] Repeat steps S2 to S3 until the preset soaking times are reached.

[0086] Step S4: Graphene ink is printed on both conductive cloth layers to form a heat conducting layer.

[0087] Step S5: placing the foam between the two heat-conducting cloth layers and bonding and fixing them to form a shielding unit.

[0088] It is understandable that the embodiment of the present application further provides a shielding unit, and the shielding unit is manufactured by the above method.

[0089] Therefore, by determining the number of immersions based on the foam material parameters and the nanomaterial parameters of the nano-conductive wire, and ensuring that the conductive conditions are met during each immersion process, at this time, after the immersion times, it can be further ensured that the conductive performance of the foam meets the conductive conditions. At the same time, the conductivity can be further increased by adding a conductive fabric layer. Therefore, the electromagnetic shielding performance of the shielding unit of the embodiment of the present application meets the shielding requirements.

[0090] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A method for manufacturing a shielding unit, characterized in that: The preparation method comprises: Determining foam material parameters of the foam and nano material parameters of the nano conductive wire; Determining the number of times the foam is immersed when the conductive condition is met according to the foam material parameters and the nano material parameters; According to the nano-conductive wires, preparing a nano-conductive solution; Soaking the foam in the nano-conductive solution until the conductive property of the foam meets the conductive condition; The foam that meets the conductive condition is taken out and dried, and the process proceeds to the step of soaking the foam in the nano conductive solution until the conductive property of the foam meets the conductive condition; When the number of times the foam is soaked reaches the number of times, a shielding unit is obtained according to the foam and the preset conductive cloth layer.

2. The method for manufacturing the shielding unit according to claim 1, characterized in that: The conductive property is set as a resistance value, and the conductive condition is that the resistance value is less than a preset resistance threshold; and determining the number of times the foam is immersed when the conductive condition is met according to the foam material parameters and the nano material parameters, comprises: Obtaining a times resistance mapping table that matches both the foam material parameters and the nano material parameters, wherein different times resistance mapping tables are used to record the relationship between each immersion times, each nano material parameter and the resistance value of the foam under different foam material parameters; Determine the physical parameters of nano-conductive wires; The number of immersion times is obtained by searching in the matching number resistance mapping table according to the resistance threshold and the physical parameter.

3. The method for manufacturing the shielding unit according to claim 2, characterized in that: The secondary resistance mapping table is determined by the following steps: Acquire nanomaterial parameters of nanoconductive materials that can be used to prepare nanoconductive solutions, wherein the nanomaterial parameters include conductive material types and physical parameters; The resistance of foam with the same foam material parameters and nano-conductive solutions of nano-conductive materials with different physical parameters and different conductive material types were verified for different soaking times; Based on the foam material parameters and the conductive material type, the resistance verification results are classified to obtain a plurality of order resistance mapping tables, so that each of the order resistance mapping tables corresponds to a combination of the foam material parameters and the conductive material type.

4. The method for manufacturing the shielding unit according to claim 1, characterized in that: The step of preparing a nano conductive solution according to the nano conductive wires comprises: Obtaining the total mass of the nano-conductive solution to be prepared; Determining a first mass of anhydrous ethanol and a second mass of the nano-conductive wire according to a preset mass ratio; A first mass of the anhydrous ethanol and a second mass of the nano-conductive wires are mixed to obtain the nano-conductive solution.

5. The method for manufacturing a shielding unit according to claim 1, characterized in that: The shielding unit is obtained according to the foam and the preset conductive cloth layer, including: A heat conducting layer is provided on opposite sides of the two conductive cloth layers; The foam is bonded between the two conductive cloth layers printed with the heat conductive layer to obtain the shielding unit.

6. The method for manufacturing the shielding unit according to claim 5, characterized in that: The thickness of the thermal conductive layer is determined by the following steps: Obtaining a thickness thermal conductivity mapping table, wherein the thickness thermal conductivity mapping table records the thermal conductivity properties of the foam of the thermal conductive layer with different thicknesses; The thickness of the heat-conducting layer is determined according to the thickness-heat-conducting mapping table and the installation size of the shielding unit.

7. The method for manufacturing a shielding unit according to claim 1, characterized in that: The method further comprises: For the first processed foam under the same foam material parameters, after the foam is immersed in the nano conductive solution, the immersion time of the foam is counted and the conductive performance of the foam is measured multiple times, and when the conductive performance reaches the conductive condition, the counted time is used as the immersion time of the current immersion, so as to obtain the immersion time of each immersion; The duration of each soaking is used to determine whether the conductivity of the foam processed after the first one under the same foam material parameters meets the conductivity condition.

8. The method for manufacturing a shielding unit according to claim 1, characterized in that: The foam material parameters include at least one of density, soaking swelling rate and thickness.

9. The method for manufacturing a shielding unit according to claim 1, characterized in that: The nanomaterial parameters include conductive material type and physical parameters; the conductive material type includes nano-gold wire, nano-silver wire and nano-copper wire, and the physical parameters include at least one of wire diameter and wire length.

10. A shielding unit, characterized in that: The shielding unit is manufactured by the method according to claim 1.

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