Z-axis insulating nickel-carbon conductive rubber sheet taking PI as base material and preparation method of Z-axis insulating nickel-carbon conductive rubber sheet

Abstract

The invention belongs to the technical field of rubber sheets, and particularly relates to a Z-axis insulating nickel-carbon conductive rubber sheet with PI as a base material and a preparation method of the Z-axis insulating nickel-carbon conductive rubber sheet. The Z-axis insulating nickel-carbon conductive rubber sheet taking PI as the base material comprises the following components in parts by weight: 120 parts of silicone rubber, 40-60 parts of vinyl resin, 20-40 parts of hydrogen-containing silicone oil, 5-15 parts of a coupling agent, 1-10 parts of a catalyst, 1-10 parts of an inhibitor and 550-750 parts of nickel-carbon powder. The nickel-carbon conductive rubber sheet disclosed by the invention is good in adhesive force with a PI base material, Z-axis insulation, low in volume resistivity and high in shielding effectiveness, meets the use effect of electronic components with high electromagnetic shielding requirements, and realizes the insulation effect between two cavities.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber sheets, and in particular relates to a Z-axis insulating nickel-carbon conductive rubber sheet with PI as a substrate and a preparation method thereof. Background Art

[0002] Electromagnetic microwave absorbing materials have a large application market in the fields of stealth technology and electromagnetic compatibility. They are generally used in the form of sheets and have the advantages of easy processing, strong absorption, and insulation. However, the absorbing material itself also has the disadvantages of a narrow absorption band and a low absorption peak. With the rise of 5G communication frequency technology and the high integration, miniaturization, and intelligent development of electronic components, the performance deterioration caused by the serious electromagnetic interference between components inside electronic products is becoming more and more serious. The use of absorbing sheets can no longer meet the application scenarios with higher requirements for electromagnetic shielding.

[0003] Nickel-carbon conductive rubber sheets can meet higher requirements for electromagnetic shielding effects, but nickel-carbon conductive rubber sheets are conductors and cannot meet the insulation requirements for electronic components. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a Z-axis insulating nickel-carbon conductive rubber sheet with PI as a substrate and a preparation method thereof. The specific technical scheme is as follows:

[0005] The first object of the present invention is to provide a Z-axis insulating nickel-carbon conductive rubber sheet with PI as a substrate, comprising the following components in parts by weight:

[0006] 120 parts of silicone rubber, 40-60 parts of vinyl resin, 20-40 parts of hydrogen-containing silicone oil, 5-15 parts of coupling agent, 1-10 parts of catalyst, 1-10 parts of inhibitor, 550-750 parts of nickel carbon powder.

[0007] Furthermore, the hardness of the silicone rubber is 5-10A.

[0008] Furthermore, the viscosity of the vinyl resin is 300-700 cP.

[0009] Furthermore, the viscosity of the hydrogen-containing silicone oil is 300-700 cP.

[0010] Furthermore, the coupling agent is a dodecylsilane coupling agent.

[0011] Furthermore, the catalyst is a platinum catalyst.

[0012] Furthermore, the inhibitor is an alkynol inhibitor.

[0013] Furthermore, the particle size of the nickel carbon powder is 70-110 um.

[0014] A second object of the present invention is to provide a method for preparing the above-mentioned PIZ-axis insulated nickel-carbon conductive rubber sheet, comprising the following steps:

[0015] (1) Add 120 parts of silicone rubber, 40-60 parts of vinyl resin, 20-40 parts of hydrogenated silicone oil, 5-15 parts of coupling agent, 1-10 parts of catalyst and 1-10 parts of inhibitor into a stirred kettle, stir for 0.5h at a speed of 35-40rpm; continue to add 550-750 parts of nickel carbon powder, stir for 0.5h at a speed of 25-30rpm; then evacuate, stir for 0.3h at a speed of 15-20rpm to obtain a pre-material;

[0016] (2) The prepared material of step (1) is calendered and compounded with a PI film using a calendering machine. The PI film has a thickness of 45-50 um. Two rollers are used to fine-press the film to 0.6-0.7 mm. The film is vulcanized at 85-125° C. to obtain a Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.6-0.7 mm, a volume resistivity of less than 0.03 ohm.cm, and a hardness of 40-50 Shore A based on PI.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: in order to reduce the viscosity of the rubber, the present invention uses silicone oil compounding; in order to achieve better electromagnetic shielding effect and low volume resistivity, large-particle nickel carbon powder is used as conductive particles, which can meet product requirements at a relatively low filling amount; high-speed stirring and mixing, and finally calendering and compounding with PI film, thereby obtaining a nickel-carbon conductive rubber sheet material with Z-axis insulation based on PI as the substrate. The nickel-carbon conductive rubber sheet has good adhesion to the PI substrate, Z-axis insulation, low volume resistivity and high shielding effectiveness, which can meet the use of electronic components with high electromagnetic shielding requirements and achieve the insulation effect between two different working cavities in the optical module. DETAILED DESCRIPTION

[0018] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0019] Unless otherwise specified, the raw materials used in the following examples and comparative examples are specifically:

[0020] The hardness of silicone rubber is 10A;

[0021] The viscosity of the vinyl resin is 300 cP;

[0022] The viscosity of hydrogen silicone oil is 300cP;

[0023] The coupling agent is dodecylsilane coupling agent;

[0024] The catalyst is a platinum catalyst;

[0025] The inhibitor is methylbutynol;

[0026] The particle size of the nickel carbon powder is 70-110 um.

[0027] Example 1

[0028] A Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate comprises the following components by weight: 120 parts of silicone rubber, 40 parts of vinyl resin, 40 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor and 600 parts of nickel-carbon powder.

[0029] The preparation method of the Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate comprises the following steps:

[0030] (1) 120 parts of silicone rubber, 40 parts of vinyl resin, 40 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor were added into a stirred kettle and stirred for 0.5 h at a speed of 35 rpm; 600 parts of nickel carbon powder were added and stirred for 0.5 h at a speed of 25 rpm; then vacuum was turned on and stirred for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0031] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.6 mm, and vulcanized at 120° C. to obtain a Z-axis insulating nickel-carbon conductive rubber sheet with a PI substrate having a thickness of 0.6 mm, a volume resistivity of 0.025 ohm.cm, a hardness of 40A, and a shielding effectiveness greater than 100 dB.

[0032] Example 2

[0033] A Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate comprises the following components by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor and 700 parts of nickel-carbon powder.

[0034] The preparation method of the Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate comprises the following steps:

[0035] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0036] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.7 mm, and vulcanized at 120° C. to obtain a Z-axis insulating nickel-carbon conductive rubber sheet with a PI substrate having a thickness of 0.7 mm, a volume resistivity of 0.015 ohm.cm, a hardness of 46A, and a shielding effectiveness greater than 100 dB.

[0037] Example 3

[0038] A Z-axis insulating nickel-carbon conductive rubber sheet with PI as a substrate comprises the following components by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor and 750 parts of nickel-carbon powder.

[0039] The preparation method of the Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate comprises the following steps:

[0040] (1) 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor were added into a stirred kettle and stirred for 0.5 h at a speed of 35 rpm; 750 parts of nickel carbon powder were added and stirred for 0.5 h at a speed of 25 rpm; then vacuum was turned on and stirred for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0041] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.7 mm, and vulcanized at 120° C. to obtain a Z-axis insulating nickel-carbon conductive rubber sheet with a PI substrate having a thickness of 0.7 mm, a volume resistivity of 0.010 ohm.cm, a hardness of 50A, and a shielding effectiveness greater than 100 dB.

[0042] Comparative Example 1

[0043] Except for the absence of PI, the other components are consistent with Example 2, and the components include, by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor, and 700 parts of nickel carbon powder.

[0044] The preparation method steps are as follows:

[0045] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0046] (2) The prepared material of step (1) is rolled to 0.7 mm by a calender and vulcanized at 120° C. to obtain a nickel-carbon conductive rubber sheet with a thickness of 0.7 mm, a volume resistivity of 0.015 ohm.cm, a hardness of 46A, and a shielding effectiveness greater than 100 dB. The Z-axis is conductive and cannot meet the product insulation requirements.

[0047] Comparative Example 2

[0048] Except that the particle size of nickel carbon powder is 25-30um, the other components are consistent with Example 2, and the components include, by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor, and 700 parts of nickel carbon powder.

[0049] The preparation method steps are as follows:

[0050] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0051] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.7 mm, and vulcanized at 120° C. to obtain a PI-based Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.7 mm, a volume resistivity of 0.07 ohm.cm, a hardness of 36A, and a shielding effectiveness of less than 100 dB. The volume resistivity and shielding effectiveness cannot meet the requirements.

[0052] Comparative Example 3

[0053] Except that the vulcanization temperature is 80°C, the other components are consistent with Example 2, and the components include, by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor, and 700 parts of nickel carbon powder.

[0054] The preparation method steps are as follows:

[0055] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0056] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.7 mm, and vulcanized at 80° C. to obtain a PI-based Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.7 mm, a volume resistivity of 0.03 ohm.cm, a hardness of 32A, and a shielding effectiveness greater than 100 dB. The colloid is not completely cured and cannot meet the use requirements.

[0057] Comparative Example 4

[0058] Except that the hardness of the silicone rubber is 20A, the other components are consistent with Example 2, and the components include, by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor, and 700 parts of nickel carbon powder.

[0059] The preparation method steps are as follows:

[0060] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 20 rpm to obtain a pre-material;

[0061] (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, rolled to 0.7 mm, and vulcanized at 120° C. to obtain a PI-based Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.7 mm, a volume resistivity of 0.015 ohm.cm, a hardness of 65A, and a shielding effectiveness greater than 100 dB. The colloid hardness is too high to meet the use requirements.

[0062] Comparative Example 5

[0063] Except for using PET film, the other components are consistent with Example 2, and the components include, by weight: 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogen-containing silicone oil, 10 parts of coupling agent, 5 parts of catalyst, 5 parts of inhibitor, and 700 parts of nickel carbon powder.

[0064] The preparation method steps are as follows:

[0065] (1) Add 120 parts of silicone rubber, 50 parts of vinyl resin, 30 parts of hydrogenated silicone oil, 10 parts of coupling agent, 5 parts of catalyst and 5 parts of inhibitor into a stirred kettle, stir for 0.5 h at a speed of 35 rpm; continue to add 700 parts of nickel carbon powder, stir for 0.5 h at a speed of 25 rpm; then open the vacuum, stir for 0.3 h at a speed of 15-20 rpm to obtain a pre-material;

[0066] (2) The prepared material of step (1) is calendered and compounded with a PET film using a calender, rolled to 0.7 mm, and vulcanized at 120° C. to obtain a PI-based Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.7 mm, a volume resistivity of 0.015 ohm.cm, a hardness of 46A, and a shielding effectiveness greater than 100 dB. The colloid has poor bonding with the PET film, is easy to fall off, and cannot meet the use requirements.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A Z-axis insulating nickel-carbon conductive rubber sheet with PI as the substrate, characterized in that: The invention comprises the following components in parts by weight: 120 parts of silicone rubber, 40-60 parts of vinyl resin, 20-40 parts of hydrogen-containing silicone oil, 5-15 parts of coupling agent, 1-10 parts of catalyst, 1-10 parts of inhibitor and 550-750 parts of nickel carbon powder.

2. The Z-axis insulated nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The hardness of the silicone rubber is 5-10A.

3. The Z-axis insulating nickel-carbon conductive rubber sheet with PI as the base material according to claim 2, characterized in that: The viscosity of the vinyl resin is 300-700 cP.

4. The Z-axis insulating nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The viscosity of the hydrogen-containing silicone oil is 300-700 cP.

5. The Z-axis insulated nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The coupling agent is dodecylsilane coupling agent.

6. The Z-axis insulating nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The catalyst is a platinum catalyst.

7. The Z-axis insulating nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The inhibitor is an alkynol inhibitor.

8. The Z-axis insulated nickel-carbon conductive rubber sheet with PI as the base material according to claim 1, characterized in that: The particle size of the nickel carbon powder is 70-110 um.

9. A method for preparing a Z-axis insulating nickel-carbon conductive rubber sheet with PI as a substrate as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Add 120 parts of silicone rubber, 40-60 parts of vinyl resin, 20-40 parts of hydrogenated silicone oil, 5-15 parts of coupling agent, 1-10 parts of catalyst and 1-10 parts of inhibitor into a stirred tank, stir for 0.5h at a speed of 35-40rpm; continue to add 550-750 parts of nickel carbon powder, stir for 0.5h at a speed of 25-30rpm; then evacuate, stir for 0.3h at a speed of 15-20rpm to obtain a pre-material; (2) The prepared material of step (1) is calendered and compounded with the PI film by a calendering machine, and two rollers are finely pressed to 0.6-0.7 mm, and vulcanized at 85-125° C. to obtain a Z-axis insulating nickel-carbon conductive rubber sheet with a thickness of 0.6-0.7 mm based on PI.