CN117637237B - Double-color metal framework composite conductive rubber - Google Patents
Double-color metal framework composite conductive rubber Download PDFInfo
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- CN117637237B CN117637237B CN202410096608.2A CN202410096608A CN117637237B CN 117637237 B CN117637237 B CN 117637237B CN 202410096608 A CN202410096608 A CN 202410096608A CN 117637237 B CN117637237 B CN 117637237B
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- 239000005060 rubber Substances 0.000 title claims abstract description 81
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- 239000002184 metal Substances 0.000 title claims abstract description 32
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 239000011231 conductive filler Substances 0.000 claims abstract description 20
- 229920002050 silicone resin Polymers 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 10
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000004945 silicone rubber Substances 0.000 claims description 40
- 238000000576 coating method Methods 0.000 claims description 34
- 239000011248 coating agent Substances 0.000 claims description 31
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 19
- 239000003973 paint Substances 0.000 claims description 15
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 6
- 229920002554 vinyl polymer Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 229920013822 aminosilicone Polymers 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical group CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- NCWQJOGVLLNWEO-UHFFFAOYSA-N methylsilicon Chemical compound [Si]C NCWQJOGVLLNWEO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The application discloses a double-color metal framework composite conductive rubber, which relates to the field of electromagnetic shielding materials and comprises a supporting framework, a silicon rubber body and an electromagnetic shielding layer which are sequentially arranged from inside to outside, wherein the electromagnetic shielding layer is prepared from the following raw materials in parts by weight: 30-45 parts of silicone resin, 55-70 parts of conductive filler, 0.1-1 part of catalyst and 1-2 parts of cross-linking agent. The application has the effect of improving the sealing performance of the conductive rubber and the electromagnetic shielding effect and the extremely stability.
Description
Technical Field
The application relates to the field of electromagnetic shielding materials, in particular to a double-color metal framework composite conductive rubber.
Background
Conductive rubber is used as a common shielding material and is widely applied to the field of electromagnetic compatibility. The novel polymer material is prepared by filling fine conductive particles (glass silver plating, aluminum silver plating, copper silver plating, carbon black, pure silver, graphite nickel plating and the like) into silicon rubber according to a certain proportion, and can well combine the water vapor sealing performance with high conductivity, and simultaneously complete environmental sealing and electromagnetic sealing. The method is widely applied to electronic equipment such as military, aerospace, aviation and the like. Such as medium and small military electronics chassis, cabinets, shelter and microwave waveguide systems, liners for waveguides and connectors, and the like.
At present, a circular conductive rubber strip or a rectangular conductive rubber strip with back glue is often selected as a shielding window in the electromagnetic shielding shelter. The circular conductive rubber strip is required to be grooved when being installed, and is placed in the groove to give certain pressure so as to achieve the electromagnetic shielding sealing effect. The rectangular conductive rubber strip is required to be grooved or coated with a layer of conductive back glue on the back surface of the rectangular conductive rubber strip when being installed, and the rectangular conductive rubber strip is installed in the groove or the back glue surface is adhered to the component when being installed, and then certain pressure is given, so that the electromagnetic shielding sealing effect is achieved.
But the hardness of the conductive rubber strip made of the doped conductive particles in the non-conductive silicon rubber is 65+/-7 ℃, the product is harder, the elasticity is poor, the conductive rubber strip is round or rectangular, the window is repeatedly opened and closed for a long time, the window is repeatedly extruded, the defect is easily generated due to stress concentration in the window, the conductivity and the sealing effect of the conductive rubber are reduced, and the electromagnetic shielding effect is reduced.
Disclosure of Invention
The application provides a double-color metal skeleton composite conductive rubber, which aims to solve the problems that the electromagnetic shielding effect and the sealing effect of the conductive rubber are reduced due to the fact that the conductive rubber made of doped conductive particles is easy to generate defects caused by stress concentration in repeated extrusion.
The application provides a double-color metal framework composite conductive rubber which adopts the following technical scheme:
The utility model provides a double-colored metal skeleton composite conductive rubber, includes supporting framework, silicon rubber body and electromagnetic shield layer that from interior to exterior set gradually, electromagnetic shield layer is made by the raw materials including the following parts by weight: 30-45 parts of silicone resin, 55-70 parts of conductive filler, 0.1-1 part of catalyst and 1-2 parts of cross-linking agent.
Through adopting above-mentioned technical scheme, through using the hardness to be 50 + -5 degrees relative conductive rubber lower nonconductive silicone rubber, then adopt braced skeleton to support the silicone rubber body and improved double-colored metal skeleton composite conductive rubber extensibility and environmental suitability, and use conductive filler and silicone to form electromagnetic shielding layer at the silicone rubber body surface, it makes electromagnetic shielding performance decline to have avoided using conductive silicone rubber long-time repeated extrusion to lead to its internal stress concentration to produce as far as possible, the electromagnetic shielding performance of double-colored metal skeleton composite conductive rubber and stability have been improved.
Optionally, the electromagnetic shielding layer is prepared by the following method: mixing and stirring silicone resin, conductive filler, catalyst and cross-linking agent, adding solvent, regulating to proper viscosity to obtain conductive paint, coating the surface of silicone rubber with conductive paint, curing at 155-165 deg.C for 8-16min, and forming the surface of silicone rubber to obtain the electromagnetic shielding layer.
Preferably, the silicone rubber body is dried after being immersed in toluene for 3-5 minutes before the conductive paint is applied.
Preferably, the silicone resin includes one or more of vinyl silicone resin, methyl silicone resin, and amino silicone resin.
By adopting the technical scheme, the conductive coating is prepared by using the silicone resin and the conductive filler as main bodies, so that on one hand, the combination with the silicone rubber body is facilitated, and the adhesiveness is improved, and on the other hand, toluene is used for treating the surface of the silicone rubber body, so that the surface of the silicone rubber body is swelled, the conductive coating is easy to be absorbed into the surface of the silicone rubber body when the conductive coating is coated, and the combination stability of the prepared electromagnetic shielding coating and the surface of the silicone rubber body is further improved.
Optionally, the cross section of supporting framework is the U-shaped, the silicone rubber body is including being used for cladding supporting framework's installation department and respectively with the first sealing part and the second sealing part that the installation department both sides are connected.
Through adopting above-mentioned technical scheme, support the silicone rubber body through the braced skeleton of U-shaped, on the one hand is to the silicone rubber body design, on the other hand is convenient for with the silicone rubber body card on the section bar of shielding window in electromagnetic shield shelter, when improving sealing performance through first sealing portion and second sealing portion, electromagnetic shield is carried out to the electromagnetic shield layer of first sealing portion and second sealing portion surface intercommunication, not only the installation of being convenient for has still improved double-colored metal skeleton composite conductive rubber's electromagnetic shield performance and stability.
Optionally, a gap is left between one end of the first sealing part far away from the mounting part and the side surface of the mounting part.
Through adopting above-mentioned technical scheme, leave the clearance between first sealing portion and installation department side, when electromagnetic shield window extrudees first sealing portion, pressure size difference produces the deformation of different degree to first sealing portion to improve the suitability of first sealing portion to the gap of equidimension not, and reduced the extruded intensity of electromagnetic shield coating to first sealing portion surface.
Optionally, both ends of the second sealing portion are connected with the side surface of the mounting portion, and the second sealing portion and the side surface of the mounting portion enclose to form a channel.
Preferably, the second sealing part and the mounting part are arranged in a concave structure on the same side in the opening direction.
Through adopting above-mentioned technical scheme, when electromagnetic shield window extrudees second sealing portion, the passageway compression of formation is enclosed with the installation department side to second sealing portion is concave structure setting with installation department opening direction syntropy one side, and the electromagnetic shield layer of second sealing portion surface department has been avoided because excessive compression leads to the damage as far as possible to the concave structure department extension when second sealing portion receives the extrusion, has improved double-colored metal skeleton composite conductive rubber's electromagnetic shield performance and stability.
Optionally, the silicon rubber body further comprises mounting protrusions arranged on two opposite side surfaces of the mounting portion, which are located in the supporting framework.
Through adopting above-mentioned technical scheme, the area of contact with the section bar when having improved the silicon rubber body and installed on the section bar of shielding window in electromagnetic shielding shelter through the installation arch, improved the stability of installation.
Optionally, the silicon rubber body is still including setting up the installation department is located the joint portion of one side of supporting the skeleton opening, the joint portion is kept away from the one end of installation department is towards keeping away from supporting the direction slope of skeleton opening sets up.
Through adopting above-mentioned technical scheme, be convenient for restrict the section bar joint in the U-shaped opening of silicon rubber body through joint portion, further improved the stability that double-colored metal skeleton complex conductive rubber was installed.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The non-conductive silicone rubber with the hardness of 50+/-5 degrees and lower than that of the conductive rubber is used, then the supporting framework is adopted to support the silicone rubber body, so that the extensibility and the environmental applicability of the double-color metal framework composite conductive rubber are improved, and the electromagnetic shielding layer is formed on the surface of the silicone rubber body by using the conductive filler and the silicone resin, so that the electromagnetic shielding performance is reduced due to the fact that stress concentration is generated in the conductive silicone rubber due to long-time repeated extrusion of the conductive silicone rubber is avoided as much as possible, and the electromagnetic shielding performance and the stability of the double-color metal framework composite conductive rubber are improved;
2. Gaps are reserved between the first sealing part and the side surface of the mounting part, when the electromagnetic shielding window extrudes the first sealing part, the first sealing part is deformed to different degrees by different pressure values, so that the applicability of the first sealing part to gaps with different sizes is improved, and the extrusion strength of an electromagnetic shielding coating on the surface of the first sealing part is reduced;
3. When the electromagnetic shielding window extrudes the second sealing part, the channel formed by the second sealing part and the side surface of the mounting part in a surrounding way is compressed, and the second sealing part and one side of the opening direction of the mounting part are arranged in a concave structure, so that the second sealing part can extend to the concave structure when being extruded, and the damage of the electromagnetic shielding layer on the outer surface of the second sealing part due to excessive compression is avoided as far as possible;
4. The contact area between the silicon rubber body and the section bar of the shielding window in the electromagnetic shielding shelter is increased through the mounting bulge, so that the mounting stability is improved;
5. The silicon rubber body is supported through the supporting framework, so that the stability of the structure of the silicon rubber body is improved.
Drawings
Fig. 1 is a schematic overall structure of embodiment 1 of the present application.
Reference numerals: 1. a support skeleton; 2. an electromagnetic shielding layer; 3. a silicon rubber body; 31. a mounting part; 32. a first sealing part; 33. a second sealing part; 34. mounting the bulge; 35. a clamping part; 4. a concave structure.
Description of the embodiments
The present application will be described in further detail with reference to examples. The following examples are only illustrative of the present application and should not be construed as limiting the scope of the application. The following examples are conducted under conventional conditions or conditions recommended by the manufacturer, and the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available unless otherwise specified. Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present application.
The starting materials used in the examples are all commercially available.
Example 1
The embodiment 1 of the application provides a double-color metal skeleton composite conductive rubber, referring to fig. 1, comprising a supporting skeleton 1, a silicon rubber body 3 and an electromagnetic shielding layer 2 which are sequentially arranged from inside to outside, wherein the supporting skeleton 1 is made of a steel belt with the specification of 08F, the cross section of the supporting skeleton is U-shaped, the silicon rubber body 3 is methyl silicon rubber, the electromagnetic shielding layer 2 is prepared by coating conductive paint on the surface of the silicon rubber body 3 and curing and forming, and the thickness of the electromagnetic shielding layer can be 0.03-0.13mm, and in the embodiment of the application, the thickness of the electromagnetic shielding layer is preferably 0.08mm.
The silicone rubber body 3 includes a mounting portion 31 for covering the supporting frame 1, and a first sealing portion 32 and a second sealing portion 33 connected to both sides of the mounting portion 31, respectively. Specifically, the cross section of the mounting portion 31 is in a U shape, the connection position of the first sealing portion 32 and the mounting portion 31 is located at one side of the mounting portion 31, which is not open, a gap is reserved between one end of the first sealing portion 32, which is far away from the mounting portion 31, and the side surface of the mounting portion 31, namely, the cross section formed by surrounding the first sealing portion 32 and one side surface of the mounting portion 31 is in an irregular n shape, so that gaps with different sizes can be filled according to the size of pressure, and the sealing effect on the gaps which are not in a straight line can be improved; both ends of the second sealing part 33 are connected with the side surface of the mounting part 31, and the second sealing part 33 and the other side surface of the mounting part 31 are surrounded to form a channel, namely the cross section formed by surrounding the second sealing part 33 and the other side surface of the mounting part 31 is p-shaped, and the second sealing part 33 and one side of the opening direction of the mounting part 31, which is in the same direction, are arranged in a concave structure 4, so that the second sealing part 33 is convenient to deform when being extruded, the internal channel forms a special extension space, and the electromagnetic shielding layer 2 on the surface of the second sealing part 33 is prevented from being damaged along with the deformation of the second sealing part 33.
Further, in order to facilitate the installation of the conductive rubber on the profile of the shielding window, the silicone rubber body 3 further includes mounting protrusions 34 disposed on two opposite sides of the mounting portion 31 in the supporting frame 1, in the present application, two mounting protrusions 34 are disposed on each side and extend obliquely in a direction away from the mounting portion 31, and in other embodiments, one, three, etc. of the mounting protrusions 34 on each side may be adapted according to the size of the profile. And for the installation department 31 and the section bar joint of being convenient for, the silicone rubber body 3 still includes the joint portion 35 that sets up in the installation department 31 and is located support skeleton 1 open-ended one side, and the one end that joint portion 35 kept away from installation department 31 is towards keeping away from support skeleton 1 open-ended direction slope setting, and specifically, joint portion 35 is the form of buckling, when pegging graft conductive rubber on the section bar, installation arch 34 and section bar surface butt improve the frictional force between installation department 31 and the section bar, and the one end that installation department 31 was kept away from to joint portion 35 and installation department 31 limit the section bar joint between the one end that installation department 31 was kept away from to joint portion 35 and installation department 31.
Examples 2 to 6
The embodiments 2-6 of the present application disclose a conductive coating and a method for forming an electromagnetic shielding layer, wherein the components and the proportions of the conductive coating are shown in table 1, and the electromagnetic shielding layer is formed by the following steps: mixing and stirring silicone resin, conductive filler, catalyst and cross-linking agent uniformly, adding solvent, stirring uniformly to obtain conductive paint, coating the conductive paint on the surface of silicone rubber, curing at 160 ℃ for 12min, and forming the surface of silicone rubber to obtain an electromagnetic shielding layer with the thickness of 0.08mm.
In the embodiment of the application, the silicon resin adopts vinyl MQ silicon resin, wherein the vinyl content is 2.0%, the M/Q is 0.75%, the conductive filler adopts silver powder, the catalyst is dibutyl tin dilaurate, the cross-linking agent is hydrogen-containing silicone oil, and the solvent is toluene.
Table 1: components and proportions of the conductive paint
| Examples | Silicone resin | Conductive filler | Catalyst | Crosslinking agent | Solvent(s) |
| Example 2 | 30 | 70 | 0.1 | 1 | 200 |
| Example 3 | 30 | 70 | 0.5 | 1.5 | 300 |
| Example 4 | 30 | 70 | 1 | 2 | 400 |
| Example 5 | 35 | 65 | 0.5 | 1.5 | 300 |
| Example 6 | 45 | 55 | 0.5 | 1.5 | 300 |
Example 7
Example 7 of the present application discloses a conductive paint, the composition and the proportion of the conductive paint adopted in example 7 are identical to those of the conductive paint adopted in example 5, and the difference between example 7 and example 5 is that: the thickness of the electromagnetic shielding layer in example 7 was 0.03mm.
Example 8
Example 8 of the present application discloses a conductive paint, the composition and the proportion of the conductive paint adopted in example 8 are identical to those of the conductive paint adopted in example 5, and the difference between example 8 and example 5 is that: the thickness of the electromagnetic shielding layer in example 8 was 0.13mm.
Example 9
The embodiment 9 of the application discloses a conductive coating and a method for forming an electromagnetic shielding layer, wherein the components and the proportion of the conductive coating adopted in the embodiment 9 are consistent with those of the conductive coating adopted in the embodiment 5, and the electromagnetic shielding layer is formed by adopting the following steps: mixing and stirring silicone resin, conductive filler, catalyst and cross-linking agent uniformly, adding solvent, stirring uniformly to obtain conductive coating, soaking the silicone rubber body in toluene for 4min, taking out and drying, coating the conductive coating, curing for 12min at 160 ℃, and forming the surface of the silicone rubber body to obtain the electromagnetic shielding layer, wherein the thickness of the electromagnetic shielding layer is 0.08mm.
In the embodiment of the application, the silicon resin adopts vinyl MQ silicon resin, wherein the vinyl content is 2.0%, the M/Q is 0.75%, the conductive filler adopts silver powder, the catalyst is dibutyl tin dilaurate, the cross-linking agent is hydrogen-containing silicone oil, and the solvent is toluene.
Comparative example 1
Comparative example 1 provides a conductive rubber comprising a circular conductive rubber strip and an electromagnetic shielding layer coated on the surface of the circular conductive rubber strip, and the forming method of the electromagnetic shielding layer and the composition and proportion of the conductive coating adopted are the same as those of example 5.
Comparative example 2
Comparative example 2 provides a conductive rubber, which is different from example 1 in that: the conductive rubber of comparative example 2 did not include an electromagnetic shielding layer, and a silicon rubber body was produced using a conductive silicon rubber having a density of 3.1g/cm 3, a hardness of 67, and a conductive filler of silver powder.
Test detection
(1) The adhesion of the conductive coatings prepared in examples 2-6 was determined according to GB/T9286 and is shown in Table 2.
Table 2:
| Data source | Adhesion rating |
| Example 2 | 1 |
| Example 3 | 1 |
| Example 4 | 1 |
| Example 5 | 0 |
| Example 6 | 0 |
(2) The conductive rubbers of examples 2 to 9 and comparative examples 1 to 2 were subjected to electromagnetic shielding effectiveness test according to the specification of GB/T12190-2006 to obtain initial electromagnetic shielding effectiveness, and then were mounted on a shielding window in an electromagnetic shielding shelter and circularly extruded 2000 times, and subjected to electromagnetic shielding effectiveness test according to the specification of GB/T12190-2006 to obtain test electromagnetic shielding effectiveness. As shown in table 3.
Table 3:
| Data source | Initial electromagnetic shielding effectiveness (dB) | Test electromagnetic shielding effectiveness (dB) |
| Example 2 | 42.6 | 38.3 |
| Example 3 | 42.8 | 38.9 |
| Example 4 | 42.5 | 38.5 |
| Example 5 | 43.3 | 40.1 |
| Example 6 | 42.9 | 39.2 |
| Example 7 | 41.2 | 37.9 |
| Example 8 | 44.5 | 39.8 |
| Example 9 | 43.5 | 40.9 |
| Comparative example 1 | 38.2 | 29.8 |
| Comparative example 2 | 35.6 | 28.3 |
The present application will be described in detail below in conjunction with the experimental data provided in tables 1-3. Referring to table 2, the conductive coatings of examples 2 to 6 all have an adhesion rating of 1 or more, and have good adhesion, and particularly the conductive coatings of examples 5 and 6 have an adhesion rating of 0, and referring to table 3, the initial electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber prepared in examples 2 to 4 is 42dB or more, and after the conductive rubber is circularly extruded 2000 times on the shielding window of the electromagnetic shielding shelter, the test electromagnetic shielding effectiveness is 38dB or more, and the electromagnetic shielding effectiveness is reduced by no more than 4dB. The electromagnetic shielding layer in the bicolor metal skeleton composite conductive rubber prepared in the examples 2-4 has good adhesion stability on the silicon rubber body.
Examples 5 and 6 examined the effect of the addition ratio of the silicone resin and the conductive filler in the conductive coating on the electromagnetic shielding effectiveness and stability of the bicolor metal-matrix composite conductive rubber, with example 3 as a control. Wherein the initial electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber of example 5 is greater than that of the two-color metal skeleton composite conductive rubber of examples 3 and 6, and wherein the difference between the initial electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber of example 5 and the experimental electromagnetic shielding effectiveness is smaller than that of the two-color metal skeleton composite conductive rubber of examples 3 and 6, the adhesion of the conductive coating in combination with examples 5 and 6 is 0 level, which means that the reduction of the conductive filler is favorable for improving the adhesion of the electromagnetic shielding coating, and the electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber and its stability are both good when the weight ratio of the conductive filler to the silicone resin is 65:35.
With example 5 as a control, examples 7 and 8 examined the effect of the coating thickness of the electromagnetic shielding layer on the electromagnetic shielding effectiveness of the bicolor metal-matrix composite conductive rubber and its stability. Wherein the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber employing example 5 is greater than the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber employing example 7, and wherein the difference between the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber employing example 5 and the experimental electromagnetic shielding effectiveness is less than the difference between the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber employing example 7 and the experimental electromagnetic shielding effectiveness; although the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 5 is smaller than that of the two-color metal-skeleton composite conductive rubber using example 8, the difference between the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 5 and the experimental electromagnetic shielding effectiveness is much larger than that of the two-color metal-skeleton composite conductive rubber using example 8. To sum up, it is explained that a low thickness results in a decrease in electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber, but a too high thickness results in a decrease in stability of the electromagnetic shielding effectiveness of the two-color metal skeleton composite conductive rubber, and it is hypothesized that the adhesion of the electromagnetic shielding layer is affected due to an increase in thickness, which easily causes damage to the electromagnetic shielding layer during cyclic extrusion. Under comprehensive consideration, when the thickness of the electromagnetic shielding layer is 0.08mm, the optimal combination property of the bicolor metal framework composite conductive rubber can be exerted.
With example 5 as a control, example 9 examined whether or not the surface treatment of the silicone rubber body has an effect on the electromagnetic shielding performance and stability of the bicolor metal-matrix composite conductive rubber. Wherein the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 9 is greater than the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 5, and wherein the difference between the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 9 and the experimental electromagnetic shielding effectiveness is less than the difference between the initial electromagnetic shielding effectiveness of the two-color metal-skeleton composite conductive rubber using example 9 and the experimental electromagnetic shielding effectiveness, it is indicated that the surface treatment of the silicone rubber body prior to the formation of the electromagnetic shielding layer is advantageous for improving the electromagnetic shielding effectiveness and stability of the two-color metal-skeleton composite conductive rubber. The surface of the silicone rubber body is surmised to be swelled due to the fact that toluene is used for treating the surface of the silicone rubber body, so that the conductive coating can be conveniently absorbed into the surface of the silicone rubber body when the conductive coating is coated, and the combination stability of the prepared electromagnetic shielding coating and the surface of the silicone rubber body is further improved.
Taking example 5 as a comparison, comparative example 1 examined the influence of the shape structure of the silicone rubber body on the electromagnetic shielding effectiveness and stability of the prepared bicolor metal-skeleton composite conductive rubber, wherein the difference between the initial electromagnetic shielding effectiveness of the bicolor metal-skeleton composite conductive rubber adopting example 5 and the experimental electromagnetic shielding effectiveness is far smaller than the difference between the initial electromagnetic shielding effectiveness of the bicolor metal-skeleton composite conductive rubber adopting comparative example 1 and the experimental electromagnetic shielding effectiveness, which shows that the shape structure of the silicone rubber body of the application is favorable for improving the stability of the electromagnetic shielding effectiveness of the conductive rubber, and the sustained integrity of the electromagnetic shielding coating on the surface of the silicone rubber body is surmised to be improved through the buffer fit of the shape structure.
Taking example 5 as a comparison, comparative example 2 examined the influence of the distribution position of the conductive filler on the electromagnetic shielding effectiveness and stability of the prepared bicolor metal-skeleton composite conductive rubber, wherein the difference between the initial electromagnetic shielding effectiveness of the bicolor metal-skeleton composite conductive rubber of example 5 and the experimental electromagnetic shielding effectiveness is far smaller than the difference between the initial electromagnetic shielding effectiveness of the bicolor metal-skeleton composite conductive rubber of comparative example 2 and the experimental electromagnetic shielding effectiveness, which means that the coating of the conductive filler on the surface of the silicon rubber body by means of the coating is beneficial to improving the stability of the electromagnetic shielding effectiveness of the conductive rubber, and referring to example 5, comparative example 1 and comparative example 2, the conductive filler is cooperated with the shape structure of the silicon rubber body by means of the electromagnetic shielding layer, thereby having a synergistic effect in improving the electromagnetic shielding effectiveness and stability of the bicolor metal-skeleton composite conductive rubber.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. A double-color metal framework composite conductive rubber is characterized in that: the electromagnetic shielding layer (2) is prepared from the following raw materials in parts by weight: 30-45 parts of silicone resin, 55-70 parts of conductive filler, 0.1-1 part of catalyst and 1-2 parts of cross-linking agent;
The cross section of the supporting framework (1) is U-shaped, and the silicon rubber body (3) comprises a mounting part (31) for coating the supporting framework (1), and a first sealing part (32) and a second sealing part (33) which are respectively connected with two sides of the mounting part (31);
A gap is reserved between one end of the first sealing part (32) far away from the mounting part (31) and the side surface of the mounting part (31);
Both ends of the second sealing part (33) are connected with the side surface of the mounting part (31), and a channel is formed by surrounding the second sealing part (33) and the side surface of the mounting part (31).
2. The bicolor metal framework composite conductive rubber according to claim 1, wherein: the electromagnetic shielding layer (2) is prepared by the following method: mixing and stirring silicone resin, conductive filler, catalyst and cross-linking agent, adding solvent to obtain conductive paint, coating the conductive paint on the surface of the silicone rubber body (3), curing for 8-16min at 155-165 ℃, and forming the electromagnetic shielding layer (2) on the surface of the silicone rubber body (3).
3. The bicolor metal framework composite conductive rubber according to claim 2, wherein: before the conductive coating is coated, the silicone rubber body (3) is soaked in toluene for 3-5min and then dried.
4. The bicolor metal framework composite conductive rubber according to claim 2, wherein: the thickness of the electromagnetic shielding layer (2) is 0.03-0.13mm.
5. The bicolor metal framework composite conductive rubber according to claim 1, wherein: the silicon rubber body (3) further comprises mounting protrusions (34) arranged on two opposite side surfaces of the mounting portion (31) located in the supporting framework (1).
6. The bicolor metal framework composite conductive rubber according to claim 1, wherein: the silicon rubber body (3) further comprises a clamping portion (35) arranged on one side of the opening of the supporting framework (1) of the mounting portion (31), and one end, far away from the mounting portion (31), of the clamping portion (35) is obliquely arranged in a direction away from the opening of the supporting framework (1).
7. The bicolor metal framework composite conductive rubber according to claim 1, wherein: the silicone resin includes one or more of vinyl silicone resin, methyl silicone resin, and amino silicone resin.
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| CN1283214A (en) * | 1997-11-03 | 2001-02-07 | 赫尔穆特·卡尔 | Plastic material and conductive plastic object |
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| JP5060647B1 (en) * | 2011-09-14 | 2012-10-31 | 三菱航空機株式会社 | Aircraft windows, opening closures, gasket seals |
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| CN1283214A (en) * | 1997-11-03 | 2001-02-07 | 赫尔穆特·卡尔 | Plastic material and conductive plastic object |
| JP2001168573A (en) * | 1999-12-03 | 2001-06-22 | Polymatech Co Ltd | Thermally conductive sheet for shielding electromagnetic wave |
| CN115197577A (en) * | 2022-08-04 | 2022-10-18 | 镇江高美新材料有限公司 | Antistatic silicone rubber composite material, flexible electrostatic shielding bag and preparation method thereof |
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