CN111916259B - Preparation method of super-soft conductive rubber and super-soft conductive rubber - Google Patents
Preparation method of super-soft conductive rubber and super-soft conductive rubber Download PDFInfo
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Abstract
The invention relates to the technical field of conductive rubber, in particular to a preparation method of super-soft conductive rubber and the super-soft conductive rubber. The preparation method comprises the following steps: s1: wire distribution: horizontally arranging a plurality of metal wires above the surface of the silicon rubber sheet, wherein the axial direction of the metal wires is consistent with the length direction of the silicon rubber sheet, and all the metal wires are parallel; s2: wire pressing: and (3) parallelly pressing the arranged metal wires along the surface of the silicon rubber sheet, heating and rolling the silicon rubber sheet to enable the metal wires to be positioned in the silicon rubber sheet, curing and cooling the silicon rubber sheet after rolling to obtain the conductive rubber embedded with the metal wires, wherein two end parts of the metal wires protrude out of the end surface of the silicon rubber sheet. The invention has the following beneficial effects: the conductive rubber prepared by the method replaces conductive metal particles with metal wires, can conduct signals when the conductive rubber is not extruded, has good conduction stability, and solves the defect of poor conduction stability in the prior art.
Description
Technical Field
The invention relates to the technical field of conductive rubber, in particular to a preparation method of super-soft conductive rubber and the super-soft conductive rubber.
Background
In surface mount technology for circuit boards, in order to reduce electromagnetic interference (EMI) noise caused by EMI, a conductive foam is generally used to reduce the EMI. The cotton middle part of electrically conductive bubble is fire-retardant sponge, and outside hoop parcel has electrically conductive cloth, and the both sides that deviate from mutually on the cotton width direction of electrically conductive bubble all do not have electrically conductive cloth to cover, so the signal of telecommunication can't be followed the width direction transmission, and electrically conductive bubble cotton has better surface conductivity, fixed connection can be very easy on needing shielding device, and it not only has electromagnetic shield's effect moreover, can also cushion it when the circuit board receives external impact, prevents that the circuit board from damaging.
With the development of chips, the size of the chip is smaller and smaller, but the conductive foam cannot be prepared to meet the size of the chip and is inconvenient to ensure the effect of reducing electromagnetic interference, so that conductive rubber is used for replacing the conductive foam at present. The conductive rubber is a special rubber for sealing and electromagnetic shielding, and is usually filled in silicon rubber by using noble metal plating particles. Although the silicone rubber is not conductive, when the conductive rubber is pressed by pressure, the conductive particles in the conductive rubber are contacted to achieve good conductive performance. The directional conduction is realized only in the pressing direction, and the electromagnetic interference is effectively reduced.
However, the noble metal plating particles in the conductive rubber are randomly arranged in the rubber, so that incomplete connection of the plating particles occurs during pressing, a circuit which should be conducted is broken, and the conduction stability is problematic.
Therefore, there is a need for a method for preparing conductive rubber, which has the advantage of good conduction stability.
Disclosure of Invention
The invention aims to provide a preparation method of ultra-soft conductive rubber, which mainly aims to solve the problem that the conductive rubber in the prior art is poor in conduction stability.
The invention also aims to provide the ultra-soft conductive rubber which is prepared by the method and has the advantage of good conduction stability.
The first object of the present invention is achieved by the following method: the preparation method of the ultra-soft conductive rubber comprises the following steps:
s1: wire distribution: horizontally arranging a plurality of metal wires above the surface of the silicon rubber sheet, wherein the axial direction of the metal wires is consistent with the length direction of the silicon rubber sheet, and the metal wires are parallel to each other;
s2: wire pressing: and (3) parallelly pressing the arranged metal wires along the surface of the silicon rubber sheet, heating and rolling the silicon rubber sheet to enable the metal wires to be positioned in the silicon rubber sheet, curing and cooling the silicon rubber sheet after rolling to obtain the conductive rubber embedded with the metal wires, wherein two end parts of the metal wires protrude out of the end surface of the silicon rubber sheet.
By adopting the technical scheme, when the conductive silicone rubber is prepared, the metal wires are arranged in parallel along the surface of the silicone rubber sheet to be distributed, at least one end of each metal wire protrudes out of the silicone rubber sheet, then the metal wires are pressed down in parallel to the surface of the silicone rubber sheet and are cured at the same time, the silicone rubber is softened at the moment, the metal wires are pressed into the silicone rubber sheet, and the metal wires are also arranged in parallel in the silicone rubber sheet because the pressing direction is the pressing down along the surface of the silicone rubber sheet. When the conductive silicone rubber is used, the silicone rubber is non-conductive and has good elasticity, so the conductive silicone rubber has a buffering effect and can play a role in electrostatic shielding, the metal wires are arranged in parallel, so the metal wires are conducted along the axial direction of the metal wires when being conducted, the conductive rubber is not conducted along any radial direction of the metal wires, and the metal wires in the conductive silicone rubber are continuous and are not like metal particles which are irregularly arranged in the prior art, so the conductive silicone rubber has good conduction stability.
The invention is further configured to: in step S1, the wires are equidistantly arranged.
Through adopting above-mentioned technical scheme, the wire equidistance sets up, and it can have better stability, compares in random distance parallel arrangement moreover, and the conducting effect of electrically conductive silicon rubber is better behind equidistance parallel arrangement, and electrically conductive silicon rubber is comparatively even moreover, and its elastic influence is less.
The invention is further configured to: in the step S1, in the step S1, at least one layer of metal wires is arranged on each of two opposite surfaces of the silicone rubber sheet.
By adopting the technical scheme, when the silicon rubber sheet is prepared, the metal wires can be arranged on two surfaces of the silicon rubber sheet which are deviated from each other, so that the number of the metal wires in one silicon rubber sheet can be increased, and the conduction efficiency of the conductive silicon rubber is improved.
The invention is further configured to: the wire diameter of the metal wire is 10-100 mu m.
By adopting the technical scheme, the wire diameter of the metal wire is 10-100 mu m, and the signal reception of the conductive metal wire is sensitive in the wire diameter range, so that the sensitivity of the conductive silicon rubber can be effectively improved.
The invention is further configured to: in the second step, the curing temperature is 200-230 ℃, and the curing time is 2-3 min.
By adopting the technical scheme, when curing, high-temperature rapid curing is used, so that the metal wires are hot-pressed into the silicon rubber sheet.
The invention is further configured to: further comprising steps S3 and S4;
s3: arranging the conductive rubbers respectively prepared in the step S2 in parallel at intervals, wherein metal wires in each conductive rubber are parallel, injecting liquid silica gel into gaps between every two adjacent conductive rubbers, and preparing conductive rubber blocks after the liquid silica gel is molded;
s4: and cutting, namely cutting the metal wire along the axial direction perpendicular to the conductive rubber block to form a plurality of conductive rubber sheets.
By adopting the above technical solution, the number of the wire layers of the conductive rubber prepared in steps S1 and S2 is small, but steps S3 and S4 may be added to increase the number of the wire layers to improve the conduction efficiency and the conduction sensitivity. In step S3, a plurality of conductive rubbers prepared in step S2 are combined into one unit, i.e., a conductive rubber block. But it is not easy to use because it is thick, so it is possible to perform cutting. In addition, in the mode, the metal wires can be arranged in the step S1, longer metal wires can be arranged, and the difficulty of arranging the metal wires is reduced. And the conductive rubber sheet is manufactured and can conduct directionally along the axial direction of the metal wire.
The invention is further configured to: the specific steps of step S3 are:
s31: sheet arranging: fixing the conductive rubber prepared in the step S2 in parallel at intervals through a die, wherein metal wires in the conductive rubber are parallel;
s32: gluing: injecting liquid silica gel into the mold filled with the conductive rubber to fill the accommodating cavity with the liquid silica gel;
s33: sequentially exhausting, pressurizing, heating and curing, cooling and demoulding after curing to form a conductive rubber block;
by adopting the technical scheme, when the conductive rubber block is prepared, the conductive rubbers are connected by using the liquid silica gel. In order to facilitate directional conduction, the conductive rubbers are arranged in parallel, and the axial directions of the metal wires are the same. The method is convenient, and the prepared conductive rubber block is not easy to separate and has high integration degree.
The second invention object is realized by the following technical scheme: the super-soft conductive rubber is prepared by the preparation method of the super-soft conductive rubber, and comprises a silicon rubber sheet layer and a liquid silicon rubber layer which are sequentially arranged; the silicon rubber sheet layer comprises a silicon rubber sheet and a plurality of metal wires which are arranged in the silicon rubber sheet layer in a penetrating mode, and the metal wires are arranged in parallel at intervals.
By adopting the technical scheme, the ultra-soft conductive rubber prepared by the method has the advantages that the arrangement of the metal wires is tidy and uniform, the conduction effect of directional conduction is good, the ultra-soft conductive rubber can be applied to contact filling of narrow gaps, and the shielding conduction in narrow spaces has good performance.
The invention is further configured to: the silicone rubber sheet is made of silicone rubber, and the silicone rubber comprises the following components in parts by weight:
100 parts of vinyl polymethyl silicone rubber;
1-5 parts of a bis 25 vulcanizing agent;
10-30 parts of silicon dioxide.
By adopting the technical scheme, the silicone rubber sheet prepared by the proportion has lower hardness and better compressibility.
The invention is further configured to: the silicone rubber comprises the following components in parts by weight:
100 parts of vinyl polymethyl silicone rubber;
5 parts of a bis-25 vulcanizing agent;
15 parts of silica.
By adopting the technical scheme, when the silicon rubber is prepared by using the proportion, the obtained silicon rubber has softer hardness and can have better protection effect on components.
The invention is further configured to: the liquid silica gel layer is made of foaming type liquid silica gel or non-foaming type liquid silica gel;
the foaming liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 1-3% of platinum catalyst, 67-86% of methyl vinyl polysiloxane, 3-10% of foaming agent and 10-20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1-10% of hydrogen-containing silicone oil, 75-94% of methyl vinyl polysiloxane and 5-15% of silicon dioxide in percentage by mass;
step three: uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1: 1;
the non-foaming liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 0-10% of platinum catalyst, 70-89.5% of methyl vinyl polysiloxane and 10-20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1-10% of hydrogen-containing silicone oil, 75-85% of methyl vinyl polysiloxane and 5-24% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the non-foaming liquid rubber.
By adopting the technical scheme, the foaming type or non-foaming type liquid silicone rubber can be selected to manufacture the liquid silicone rubber layer according to different conditions. The foamed liquid rubber prepared by the method has the hardness of 10-30Shore A, and the non-foamed liquid rubber has the hardness of 10-30Shore A. When foamed or unfoamed rubber is adopted, the prepared conductive rubber is softer and has a wider application range.
Further, the foaming type liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 1% of platinum catalyst, 82% of methyl vinyl polysiloxane, 5% of foaming agent and 12% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 3 mass percent of hydrogen-containing silicone oil, 87 mass percent of methyl vinyl polysiloxane and 10 mass percent of silicon dioxide;
step three: uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the foaming liquid rubber;
by adopting the technical scheme, the prepared foaming type liquid silica gel has better flexibility and larger compressible amount.
Further, the non-foaming liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 0.5 mass percent of platinum catalyst, 89.5 mass percent of methyl vinyl polysiloxane and 10 mass percent of silicon dioxide;
step two: preparing a component B, and uniformly mixing 3% of hydrogen-containing silicone oil, 82% of methyl vinyl polysiloxane and 10% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1, and pressing at normal temperature and normal pressure for 24 hours to obtain the non-foaming liquid rubber.
By adopting the technical scheme, the prepared non-foaming liquid silica gel has better mechanical strength.
In summary, the invention includes at least one of the following beneficial technical effects:
1. after the metal wire is used for replacing the conductive metal particles, in the actual use process, the signal can be conducted without extruding the conductive rubber, and the signal can not change along with the change of the pressing strength, so that the conductive metal particle has better conduction stability.
2. The metal wire used in the method can adopt a metal wire with magnetism or a metal wire without magnetism, and the application range is wider.
3. The conductive rubber produced by the invention can be used in narrow gaps and has better electromagnetic shielding effect.
Drawings
Fig. 1 is a schematic view of a wire arrangement according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pressed conductive rubber according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of another conductive rubber after wire pressing according to an embodiment of the present invention.
Fig. 4 is a schematic overall structure diagram of a mold according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of another conductive rubber block and conductive rubber according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an ultra-soft conductive rubber according to an embodiment of the present invention.
Reference numerals: 1. a silicone rubber sheet; 2. a metal wire; 3. liquid silica gel; 4. a mold; 41. an accommodating chamber; 42. and (6) accommodating the tank.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Preparation example 1
A foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 3% of platinum catalyst, 67% of methyl vinyl polysiloxane, 10% of foaming agent and 20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 10% of hydrogen-containing silicone oil, 75% of methyl vinyl polysiloxane and 15% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1, and foaming the liquid rubber.
Preparation example 2
A foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 1% of platinum catalyst, 86% of methyl vinyl polysiloxane, 3% of foaming agent and 10% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1 mass percent of hydrogen-containing silicone oil, 94 mass percent of methyl vinyl polysiloxane and 5 mass percent of silicon dioxide;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the foaming liquid rubber.
Preparation example 3
A foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 1% of platinum catalyst, 82% of methyl vinyl polysiloxane, 5% of foaming agent and 12% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 3 mass percent of hydrogen-containing silicone oil, 87 mass percent of methyl vinyl polysiloxane and 10 mass percent of silicon dioxide;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the foaming liquid rubber.
Preparation example 4
A non-foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 90% of methylvinyl polysiloxane and 10% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1% of hydrogen-containing silicone oil, 75% of methyl vinyl polysiloxane and 24% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the non-foaming liquid rubber.
Preparation example 5
A non-foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 10% of platinum catalyst, 70% of methyl vinyl polysiloxane and 20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 10% of hydrogen-containing silicone oil, 85% of methyl vinyl polysiloxane and 5% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the non-foaming liquid rubber.
Preparation example 6
A non-foaming liquid silica gel is prepared by the following steps:
the method comprises the following steps: preparing a component A, and uniformly mixing 0.5 mass percent of platinum catalyst, 89.5 mass percent of methyl vinyl polysiloxane and 10 mass percent of silicon dioxide;
step two: preparing a component B, and uniformly mixing 3% of hydrogen-containing silicone oil, 82% of methyl vinyl polysiloxane and 10% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the non-foaming liquid rubber.
Preparation example 7
A silicone rubber sheet 1 is prepared by the following steps:
100 parts of vinyl polymethyl silicone rubber, 5 parts of bis 25 vulcanizing agent and 15 parts of silicon dioxide are mixed, the mixture is vulcanized through a drying tunnel after mixing, the vulcanization temperature is 250 ℃, the vulcanization time is 15min, and the molded silicone rubber sheet 1 is obtained after vulcanization.
Preparation example 8
A silicone rubber sheet 1 is prepared by the following steps:
100 parts of vinyl polymethyl silicone rubber, 5 parts of bis 25 vulcanizing agent and 15 parts of silicon dioxide are mixed, the mixture is vulcanized through a drying tunnel after mixing, the vulcanization temperature is 250 ℃, the vulcanization time is 15min, and the molded silicone rubber sheet 1 is obtained after vulcanization.
Preparation example 9
A silicone rubber sheet 1 is prepared by the following steps:
100 parts of vinyl polymethyl silicone rubber, 5 parts of bis 25 vulcanizing agent and 15 parts of silicon dioxide are mixed, the mixture is vulcanized through a drying tunnel after mixing, the vulcanization temperature is 250 ℃, the vulcanization time is 15min, and the molded silicone rubber sheet 1 is obtained after vulcanization.
Example 1
An ultra-soft conductive rubber is prepared by the following steps:
s1: wire distribution: as shown in fig. 1, a plurality of metal wires 2 were horizontally arranged along the upper side of the surface of the silicone rubber sheet 1 prepared in preparation example 7, the axial direction of the metal wires 2 was coincident with the longitudinal direction of the silicone rubber sheet 1, and the metal wires 2 were parallel to each other. Wherein, the metal wire 2 is drawn by a roller and the tension of the metal wire 2 is kept to be 10-100N. 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100N can be selected, the metal wires 2 are arranged in parallel at equal intervals, and a layer of metal wires 2 is arranged on two opposite surfaces of the silicon rubber sheet 1.
It should be noted here that the metal wire 2 may be a magnetic metal wire 2, a non-magnetic metal wire 2, or a metal wire 2 with a plating layer, such as a copper wire, a stainless steel wire, a silver wire, a gold wire, a nickel wire, an aluminum wire, a gold-plated copper wire, a gold-plated silver wire, a nickel-plated copper wire, etc. The wire diameter of the wire 2 is in the range of 10-100 μm, for example, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm may be selected. The distance between adjacent wires 2 may be 0.1-1.0mm, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 mm.
In the present embodiment, the metal wires 2 are selected from gold wires, and the wire diameter thereof is 50 μm, and the distance between adjacent metal wires 2 may be 0.4 mm.
S2: wire pressing: and (3) parallelly pressing the arranged metal wires 2 along the corresponding surface of the silicon rubber sheet 1, heating and rolling to enable the metal wires 2 to be positioned in the silicon rubber sheet 1, curing and cooling after hot pressing to obtain the conductive rubber embedded with the metal wires 2, wherein two end parts of the metal wires 2 protrude out of the end surface of the silicon rubber sheet 1, and the cross section is as shown in fig. 3. Wherein the curing temperature is 220 ℃, the curing time is 3min, the cooling mode is natural cooling, and the cooling time is 2 h. It should be noted here that if two or more layers of metal wires 2 are arranged on two opposite surfaces of the silicone rubber sheet 1, the metal wires 2 closest to the surface of the silicone rubber sheet 1 need to be hot-pressed first, then the second layer of metal wires 2 is arranged and hot-pressed, and so on.
S3: and (2) arranging more than two pieces of conductive rubber prepared in S2 in parallel at intervals, enabling the metal wires 2 in each composite sheet to be parallel, injecting the liquid silica gel 3 prepared in the preparation example 1 into gaps among the conductive rubber, and preparing a conductive rubber block after the silicone rubber is molded. Specifically, the method comprises the following steps:
s31: sheet arranging: the conductive rubbers prepared by the step of S2 are fixed in parallel at intervals by the mold 4, and the wires 2 are parallel in each conductive rubber.
Wherein, the mold 4 can be as shown in fig. 4, which is a rectangular box body, the mold 4 has a containing cavity 41, and the containing cavity 41 is used for containing the conductive rubber prepared in S2. Specifically, on the lateral wall that holds chamber 41, set up a plurality of parallel arrangement's strip holding tank 42 along the direction of height of box body, it is preferred, each strip holding tank 42 is the equidistance setting. The strip-shaped receiving groove 42 is for receiving one of the aforementioned conductive rubbers. The distance between adjacent strip-shaped accommodating grooves 42 is 0.3-1mm, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 mm.
The conductive rubber is inserted in parallel into the accommodation groove 42 at intervals, and ensures that the axial direction of the wires 2 in each composite sheet is the same.
It will be noted here that: the distance between adjacent strip-shaped receiving grooves 42 may be different from the distance between the inner wall of the receiving groove 42 and the end strip-shaped receiving groove 42 closest thereto. That is, the distance between the adjacent conductive rubbers to be manufactured may be different from the distance between the end conductive rubber and the inner wall of the corresponding mold 4. The distance between the end conductive rubber and the corresponding inner wall of the mold 4 may be 0.5-1.5 mm. For example, it may be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 mm. In the present embodiment, the distance between the edge conductive rubber and the closest end face is 1.0mm, and the distance between the adjacent conductive silicone rubbers is 0.3 mm.
S32: and (3) gluing, namely injecting the liquid silica gel 3 prepared in the preparation example 1 into a mold 4 filled with the conductive rubber to enable the liquid silica gel 3 to fill the accommodating cavity 41, so as to ensure that all gaps are filled with the silicone rubber.
S33: and sequentially exhausting and curing, cooling and demoulding after curing to form the conductive rubber block.
Wherein, the vacuum exhaust is carried out in a vacuum exhaust mode for 10-15min, the vacuum is pumped to 0.08MPa and then placed for 48H, then heating is carried out, the heating temperature is 180-200 ℃, the pressing time is 10-30min, and the conductive rubber block is obtained after molding and demoulding.
The conductive rubber block is shown in fig. 5, and is a sandwich structure, i.e. a composite block of a layer of liquid silicone rubber and a layer of conductive silicone rubber, and it should be noted here that: the end surfaces of the conductive rubber blocks are all non-conductive liquid silicone rubber layers.
S4: and cutting, namely cutting the conductive rubber block perpendicularly to the axial direction of the metal wire 2 (namely the arrow direction in fig. 5) to form a plurality of conductive rubber sheets, so as to form the ultra-soft conductive rubber. The cutting thickness is 0.3-10 mm. For example, the conductive rubber sheet may have a thickness of 0.3, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 mm. In the present embodiment, the conductive rubber sheet has a thickness of 1.0mm, and is shown in fig. 6.
Example 2
An ultra-soft conductive rubber, this example was different from example 1 in that, in step S1, the silicone rubber sheet 1 obtained in preparation example 8 was used, and in step S3, the foaming-type liquid silicone rubber obtained in preparation example 2 was used.
Example 3
An ultra-soft conductive rubber, this example was different from example 1 in that, in step S1, the silicone rubber sheet 1 obtained in production example 9 was used, and in step S3, the foaming-type liquid silicone rubber obtained in production example 3 was used.
Example 4
An ultra-soft conductive rubber, this example was different from example 1 in that the silicone rubber sheet 1 obtained in production example 7 was used in step S1, and the non-foaming liquid silicone rubber obtained in production example 4 was used in step S3.
And S33 specifically is: and sequentially exhausting and curing, cooling and demoulding after curing to form the conductive rubber block.
Wherein, the vacuum exhaust is carried out in a vacuum exhaust mode, the vacuum exhaust time is 10-15min, the vacuum is pumped to 0.08MPa and then the mixture is placed for 48H, then the mixture is pressed for 24-48H at normal temperature and normal pressure, and the conductive rubber block is formed after demoulding.
Example 5
An ultra-soft conductive rubber, this example was different from example 4 in that, in step S1, the silicone rubber sheet 1 obtained in production example 8 was used, and in step S3, the non-foaming liquid silicone rubber obtained in production example 5 was used.
Example 6
An ultra-soft conductive rubber, this example was different from example 4 in that, in step S1, the silicone rubber sheet 1 obtained in production example 9 was used, and in step S3, the non-foaming liquid silicone rubber obtained in production example 6 was used.
Comparative example 1
An electrically conductive rubber made by the method of:
uniformly mixing conductive metal particles and liquid silica gel 3, wherein the conductive metal particles are gold particles, the size of the conductive metal particles is 40 micrometers, the liquid silica gel 3 is commercially available liquid silica gel 3, and the weight ratio of the conductive metal particles to the liquid silica gel 3 is 1: 0.3.
rolling the mixed substance into sheets by a roller, then vulcanizing and forming the sheets by an oven at high temperature to obtain the sheets, heating the sheets at the temperature of 180 ℃ and 200 ℃ to obtain the sheets with the thickness of 0.5-5mm, and then cutting the sheets into the required length and width.
Performance testing
The following are the performance tests performed on the conductive rubbers prepared in the above examples and comparative examples:
1. and (3) testing the density: density testing was performed according to ASTM D792 test standard, with test results as shown in Table 1.
2. And (3) volume resistivity test: the volume resistivity test was performed according to MIL-DTL-83528C test standard, and the test results are shown in Table 1.
3. And (3) contact resistance testing: the contact resistance test was performed according to the MIL-DTL-83528C test standard, and the test results are shown in Table 1.
4. And (3) hardness testing: hardness testing was performed according to ASTM D2240 test standards, and the test results are shown in Table 1.
5. And (3) testing shielding effectiveness: the shielding effectiveness test was performed according to MIL-DTL-83528C test standard, and the test results are shown in Table 1.
6. And (3) testing the working temperature: the operating temperature test was performed according to ASTM D1329 test standard, and the test results are shown in Table 1.
From table 1, it can be seen that, when examples 1 to 6 are compared with comparative example 1, the density of the ultra-soft conductive rubber provided in examples 1 to 6 is low, so that the conductive rubber with the same volume is low, and the ultra-soft conductive rubber sheet provided by the technical scheme has low mass and meets the current requirements on electronic components. In addition, the ultra-soft conductive rubber provided by the embodiments 1 to 6 has a small hardness of 10 to 20shore A, has good flexibility, and can better protect components in a circuit board when in use. In terms of working temperature, the ultra-soft conductive rubber provided by the embodiments 1 to 6 has a wide temperature application range, can keep working at-55 ℃ to +170 ℃, can meet the application requirements of special temperature, and has a wide application range.
In addition, the ultra-soft conductive rubbers provided in examples 1 to 6 have a low volume resistivity, which is much smaller than 0.008 specified by the standard, so that they have a low resistance, can effectively reduce consumption in a circuit and heat generation, and have a low contact resistance, so that they have a good performance in operation.
In addition, for the shielding function, the ultra-soft conductive rubbers provided in examples 1 to 6 all meet the standard requirements of 500M, 2G and 10G and are greater than or equal to 100dB, and the average is 120dB, so that the ultra-soft conductive rubbers have better shielding performance.
As can be seen from table 1, in examples 1 to 6, when the liquid silicone rubber 3 is an expanded liquid silicone rubber, the ultra-soft conductive rubber prepared in example 3 has better flexibility, lower resistance and better shielding performance. When the liquid silicone rubber 3 is a non-foamed liquid silicone rubber, the super-soft conductive rubber prepared in example 6 has better flexibility, lower resistance and better shielding property. In addition, in examples 1 to 3, compared with examples 4 to 6, when non-foamed liquid silicone rubber is used, the hardness of the obtained conductive rubber is low, and the conductive rubber can be applied to special applications, and when electronic components require high buffering capacity, the conductive rubber prepared from foamed liquid silicone rubber can be used.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A preparation method of ultra-soft conductive rubber is characterized by comprising the following steps: the method comprises the following steps:
s1: wire distribution: horizontally arranging a plurality of metal wires (2) along the upper part of the surface of the silicon rubber sheet (1), wherein the axial direction of the metal wires (2) is consistent with the length direction of the silicon rubber sheet (1), the metal wires (2) are parallel, the wire diameter of each metal wire (2) is 10-100 mu m, and the distance between every two adjacent metal wires (2) is 0.1-1.0 mm;
s2: wire pressing: pressing the arranged metal wires (2) in parallel along the surface of the silicon rubber sheet (1) and simultaneously heating and rolling to enable the metal wires (2) to be positioned in the silicon rubber sheet (1), curing and cooling after rolling to obtain the conductive rubber embedded with the metal wires (2), wherein two end parts of the metal wires (2) protrude out of the end surface of the silicon rubber sheet (1);
s3: the conductive rubber prepared by the step S2 is arranged in parallel at intervals, metal wires (2) in each conductive rubber are parallel, liquid silica gel (3) is injected into a gap between adjacent conductive rubbers, and after the conductive rubbers are molded, a conductive rubber block is prepared, and the method specifically comprises the following steps:
s31: sheet arranging: fixing the conductive rubber prepared by the step S2 in parallel at intervals through a die (4), wherein the metal wires (2) in each conductive rubber are parallel;
s32: gluing: injecting liquid silica gel (3) into the mold (4) filled with the conductive rubber to enable the liquid silica gel (3) to fill the accommodating cavity (41);
s33: sequentially exhausting and curing, cooling and demoulding after curing to form a conductive rubber block;
s4: and cutting, namely cutting the conductive rubber block along the axial direction of the metal wire (2) along the direction vertical to the conductive rubber block to form a plurality of conductive rubber sheets.
2. The method for preparing the ultra-soft conductive rubber according to claim 1, wherein the method comprises the following steps: in the step S1, the wires (2) are equidistantly arranged.
3. The method for preparing an ultra-soft conductive rubber according to claim 1 or 2, wherein: in the step S1, at least one layer of metal wires (2) is arranged on each of two opposite surfaces of the silicone rubber sheet (1).
4. The method for preparing an ultra-soft conductive rubber according to claim 1 or 2, wherein: in the step S2, the curing temperature is 200-230 ℃, and the curing time is 2-3 min.
5. An ultra-soft conductive rubber, which is prepared by the method for preparing an ultra-soft conductive rubber according to any one of claims 1 to 4; and comprises a silicon rubber sheet layer and a liquid silica gel layer which are arranged in sequence;
the silicon rubber sheet layer comprises a silicon rubber sheet (1) and a plurality of metal wires (2) which are arranged inside the silicon rubber sheet layer in a penetrating mode, and the metal wires (2) are arranged in parallel at intervals.
6. The ultra-soft conductive rubber according to claim 5, wherein the silicone rubber sheet (1) is made of silicone rubber, and the silicone rubber comprises the following components in parts by weight:
100 parts of vinyl polymethyl silicone rubber;
1-5 parts of a bis 25 vulcanizing agent;
10-30 parts of silicon dioxide.
7. The ultra-soft conductive rubber as claimed in claim 5, wherein the liquid silicone layer is made of foamed liquid silicone rubber or non-foamed liquid silicone rubber;
the foaming liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 1-3% of platinum catalyst, 67-86% of methyl vinyl polysiloxane, 3-10% of foaming agent and 10-20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1-10% of hydrogen-containing silicone oil, 75-94% of methyl vinyl polysiloxane and 5-15% of silicon dioxide in percentage by mass;
step three: uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1: 1;
the non-foaming liquid silica gel is prepared by the following method:
the method comprises the following steps: preparing a component A, and uniformly mixing 0-10% of platinum catalyst, 70-89.5% of methyl vinyl polysiloxane and 10-20% of silicon dioxide in percentage by mass;
step two: preparing a component B, and uniformly mixing 1-10% of hydrogen-containing silicone oil, 75-85% of methyl vinyl polysiloxane and 5-24% of silicon dioxide in percentage by mass;
step three: and (3) uniformly mixing the component A prepared in the step one with the component B prepared in the step two in a ratio of 1:1 to obtain the non-foaming liquid silica gel.
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