CN112143117A - Conductive fiber reinforced shielding material and preparation method thereof - Google Patents

Conductive fiber reinforced shielding material and preparation method thereof Download PDF

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Publication number
CN112143117A
CN112143117A CN202011105946.6A CN202011105946A CN112143117A CN 112143117 A CN112143117 A CN 112143117A CN 202011105946 A CN202011105946 A CN 202011105946A CN 112143117 A CN112143117 A CN 112143117A
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parts
powder
conductive
compound
shielding material
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刘广萍
阙巧珍
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Shenzhen Frd Science & Technology Co ltd
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Shenzhen Frd Science & Technology Co ltd
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    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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Abstract

The invention relates to the technical field of shielding, in particular to a conductive fiber reinforced shielding material and a preparation method corresponding to the conductive fiber reinforced shielding material, wherein the conductive fiber reinforced shielding material comprises the following substances in parts by mass: 100 parts of raw rubber; 2-10 parts of zinc oxide; 2-10 parts of stearic acid; 10-300 parts of reinforcing carbon black; 0.2-5 parts of a crosslinking assistant; 0.2-10 parts of a crosslinking agent; 50-200 parts of conductive powder; 0.5-20 parts of conductive fiber; 10-150 parts of a softener. The shielding material has good mechanical property and process property, good impact elasticity, high tensile strength and low price, thereby being widely applied to the fields of automobile electric control and steering parts, electronic devices, communication for medical equipment and the like.

Description

Conductive fiber reinforced shielding material and preparation method thereof
Technical Field
The invention relates to the technical field of gap shielding, in particular to a conductive fiber reinforced shielding material and a preparation method corresponding to the conductive fiber reinforced shielding material.
Background
The rapid development of electronic and electrical equipment in the information era brings convenience to people, and simultaneously generates a large number of negative effects, such as electromagnetic information leakage, electromagnetic environmental pollution, electromagnetic interference and other new environmental pollution problems. High-performance electromagnetic wave shielding materials have become a key technology for solving the problem of electromagnetic wave pollution. With the advent of the high-frequency and high-speed 5G era and the development of wearable equipment, higher requirements are put on electromagnetic shielding materials. Although the metal material has good electromagnetic shielding performance, the further application of the metal material is limited by the characteristics of high density, easy corrosion and the like. Therefore, the development of efficient, lightweight, flexible, corrosion-resistant metal-based electromagnetic wave shielding materials is a significant challenge.
The development and application of advanced composite materials will be in the rapid development period, so the development of reinforcements for composite materials is very important. All components that have the functions of improving strength and improving performance in the polymer matrix composite material can be called reinforcing materials.
With the rapid development of modern electronic industry, the number of various wireless communication systems and high-frequency electronic devices is rapidly increased, the demand of electromagnetic shielding devices is increasing day by day, at present, the electromagnetic shielding polymer composite material in the market mainly adopts a silicon rubber material as a base material, the tensile strength and fatigue resistance are poor, the price is high, the application field has certain limitations, and the problem that the tensile strength of the current conductive silicon rubber is poor, especially the problem that the high strength and high conductivity of the current conductive silicon rubber are difficult to be simultaneously possessed is solved.
Disclosure of Invention
In view of the above problems, embodiments of the present invention have been made to provide a conductive fiber reinforced shielding material and a corresponding conductive fiber reinforced shielding material manufacturing method that overcome or at least partially solve the above problems.
In order to solve the above problems, an embodiment of the present invention discloses a conductive fiber reinforced shielding material, which comprises the following components by mass:
100 parts of raw rubber;
2-10 parts of zinc oxide;
2-10 parts of stearic acid;
10-300 parts of reinforcing carbon black;
0.2-5 parts of a crosslinking assistant;
0.2-10 parts of a crosslinking agent;
50-200 parts of conductive powder;
0.5-20 parts of conductive fiber;
10-150 parts of a softener.
Further, the crude rubber is ethylene propylene diene monomer rubber.
Further, the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel-carbon powder and/or silver-copper powder and/or silver-aluminum powder and/or silver-nickel powder and/or silver powder and/or nickel-aluminum powder.
Further, the conductive fibers comprise carbon fibers and/or metallized carbon fibers and/or stainless steel fibers, or carbon fibers and/or metallized glass fibers.
Further, the conductive fibers are used for better forming a continuous lapping conductive network in the shielding material and improving the mechanical property of the shielding material.
Further, the softening agent comprises paraffin oil and/or pine tar oil and/or naphthenic oil and/or engine oil.
The embodiment of the invention discloses a preparation method of a conductive fiber reinforced shielding material, which comprises the following steps of:
s1, plasticating 100 parts of ethylene propylene diene raw rubber to obtain a plasticated product;
s2, adding 2-10 parts of activating agent and 2-10 parts of stearic acid into the plasticated product, and uniformly mixing to generate a primary compound;
s3, adding 10-300 parts of reinforcing carbon black into the primary compound, and uniformly mixing to generate a secondary compound;
s4, taking 10-150 parts of softener, and adding one third of the softener to the secondary compound to generate a tertiary compound;
s5, sequentially taking 50-200 parts of conductive powder and the rest of softener, and sequentially and slowly adding the conductive powder and the rest of softener into the tertiary compound to generate a quaternary compound;
s6, slowly adding 0.5-20 parts of conductive fiber into the compound for the fourth time to generate a compound for the fifth time;
s7, adding 0.2-5 parts of cross-linking assistant and 0.2-10 parts of cross-linking agent into the five-time compound to generate a six-time compound;
s8, discharging the six-time compound to obtain a sheet;
s9, cooling the sheet to obtain the conductive fiber reinforced shielding material.
Further, the activator is zinc oxide;
the softening agent is paraffin oil;
the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel carbon powder and/or silver copper powder and/or silver aluminum powder and/or silver nickel powder and/or silver powder and/or nickel aluminum powder;
the conductive fiber is nickel-plated carbon fiber;
the crosslinking assistant is TAIC;
the cross-linking agent is DCP.
Further, after the materials are added in the steps S2-S7, the mixture is fully reacted through uniform mixing.
Further, the method comprises the following steps of sequentially taking 50-200 parts of conductive powder and the rest of softening agent, and sequentially and slowly adding the conductive powder and the rest of softening agent into the third compound to generate a fourth compound, wherein the fourth compound comprises:
and sequentially taking 50-200 parts of conductive powder and the rest of softener, dividing into two times, sequentially and slowly adding the three compounds, and uniformly mixing the three compounds, the conductive powder and the softener to generate a fourth compound.
The embodiment of the invention has the following advantages:
the invention takes Ethylene Propylene Diene Monomer (EPDM) with more excellent mechanical property as a base material, and adopts conductive fiber and conductive powder as conductive filler, and utilizes the characteristics of high length-diameter ratio and easy lap joint of the conductive fiber and the conductive powder to achieve better electromagnetic shielding effect, and a small amount of conductive fiber can play a certain role in enhancing the mechanical property of the material, thereby preparing the shielding material with excellent shielding property and high tensile strength. The product has better mechanical property and processing property, good impact elasticity, high tensile strength and low price.
Drawings
FIG. 1 is a flow chart of the steps of an embodiment of a method of making a conductive fiber reinforced shielding material of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
One of the core ideas of the embodiment of the invention is that the raw ethylene propylene diene monomer is used as a base material, the conductive fiber and the conductive powder are used as fillers to prepare the shielding material with high tensile strength. The finished product has better mechanical property and process property, good impact elasticity, high tensile strength, excellent thermal aging resistance and low price, thus being widely applied to the fields of automobile electric control and steering parts, electronic devices, communication for medical equipment and the like.
The embodiment of the invention discloses a conductive fiber reinforced shielding material, which comprises the following substances in parts by mass:
100 parts of raw rubber;
2-10 parts of zinc oxide;
2-10 parts of stearic acid;
10-300 parts of reinforcing carbon black;
0.2-5 parts of a crosslinking assistant TAIC (Triallyl isocyanurate);
0.2-10 parts of DCP (dicumyl peroxide ) as a crosslinking agent;
50-200 parts of conductive powder;
0.5-20 parts of conductive fiber;
10-150 parts of a softener.
Further, the crude rubber is ethylene propylene diene monomer rubber.
Further, the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel-carbon powder and/or silver-copper powder and/or silver-aluminum powder and/or silver-nickel powder and/or silver powder and/or nickel-aluminum powder.
Further, the conductive fibers comprise carbon fibers and/or metallized carbon fibers and/or stainless steel fibers, or carbon fibers and/or metallized glass fibers.
Further, the conductive fibers are used for better forming a continuous lapped conductive network in the shielding material and improving the mechanical property of the shielding material; the conductive fibers and the conductive powder are conductive fillers, the characteristics of high length-diameter ratio and easiness in lap joint of the conductive fibers are utilized, the conductive fibers and the conductive powder are combined to achieve a good electromagnetic shielding effect, and a small amount of conductive fibers can play a certain role in enhancing the mechanical property of the material.
Further, the softening agent comprises paraffin oil and/or pine tar oil and/or naphthenic oil and/or engine oil.
In another embodiment, a conductive fiber reinforced shielding material is disclosed, comprising the following mass components:
the raw rubber is 100 parts of ethylene propylene diene monomer raw rubber; 2-10 parts of zinc oxide is selected as an active agent; 2-10 parts of stearic acid; 10-300 parts of reinforcing carbon black; the crosslinking assistant is 0.2-5 parts of triethanolamine or 0.2-5 parts of crosslinking agent TAIC; 0.2-10 parts of DCP is selected as a crosslinking agent; 0-200 parts of conductive powder; 0.5-20 parts of conductive fiber; 10-150 parts of a softener. For example: as a preferred example, 100 parts of three-well 4045 is selected as raw rubber, and 5 parts of zinc oxide is selected as an active agent; 2 parts of stearic acid; 25 parts of N770 carbon black is selected as reinforcing carbon black; 2 parts of TAIC cross-linking agent is selected as the cross-linking auxiliary agent; 5 parts of a crosslinking agent DCP; 50 parts of 80# paraffin oil is selected as the softener; 250 parts of graphite nickel-plated conductive powder (D50-110) is selected as the conductive powder; the conductive fiber is 20 parts of nickel-plated carbon fiber.
In another embodiment, referring to fig. 1, a flow chart of steps of an embodiment of a method for preparing a shielding material reinforced by conductive fibers according to the present invention is shown, which may specifically include the following steps:
s1, plasticating 100 parts of ethylene propylene diene raw rubber to obtain a plasticated product;
s2, adding 2-10 parts of activating agent and 2-10 parts of stearic acid into the plasticated product, and uniformly mixing to generate a primary compound;
s3, adding 10-300 parts of reinforcing carbon black into the primary compound, and uniformly mixing to generate a secondary compound;
s4, taking 10-150 parts of softener, and adding one third of the softener to the secondary compound to generate a tertiary compound;
s5, sequentially taking 50-200 parts of conductive powder and the rest of softener, and sequentially and slowly adding the conductive powder and the rest of softener into the tertiary compound to generate a quaternary compound;
s6, slowly adding 0.5-20 parts of conductive fiber into the compound for the fourth time to generate a compound for the fifth time;
s7, adding 0.2-5 parts of cross-linking assistant and 0.2-10 parts of cross-linking agent into the five-time compound to generate a six-time compound;
s8, discharging the six-time compound to obtain a sheet;
s9, cooling the sheet to obtain the conductive fiber reinforced shielding material.
Further, the activator is zinc oxide;
the softening agent is paraffin oil;
the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel carbon powder and/or silver copper powder and/or silver aluminum powder and/or silver nickel powder and/or silver powder and/or nickel aluminum powder;
the conductive fiber is nickel-plated carbon fiber;
the crosslinking assistant is TAIC;
the cross-linking agent is DCP.
Further, after the materials are added in the steps S2-S7, the mixture is fully reacted through uniform mixing.
Further, the method comprises the following steps of sequentially taking 50-200 parts of conductive powder and the rest of softening agent, and sequentially and slowly adding the conductive powder and the rest of softening agent into the third compound to generate a fourth compound, wherein the fourth compound comprises:
and sequentially taking 50-200 parts of conductive powder and the rest of softener, dividing into two times, sequentially and slowly adding the three compounds, and uniformly mixing the three compounds, the conductive powder and the softener to generate a fourth compound.
In another embodiment, the method specifically includes the following steps:
s1, plasticating 100 parts of ethylene propylene diene monomer crude rubber to obtain a plasticated product, wherein the ethylene propylene diene monomer crude rubber preferably adopts a three-well 4045;
s2, adding 2-10 parts of an activating agent and 2-10 parts of stearic acid into the plasticated product, and uniformly mixing to generate a primary compound, wherein the activating agent is preferably zinc oxide;
s3, adding 10-300 parts of reinforcing carbon black into the primary compound, and uniformly mixing to generate a secondary compound, wherein N770 carbon black is preferably used;
s4, taking 10-150 parts of a softening agent, and adding one third of the softening agent to the secondary compound to generate a tertiary compound, wherein the softening agent is preferably 80# paraffin oil;
s5, sequentially taking 50-200 parts of conductive powder and the rest of softening agent, and sequentially and slowly adding the conductive powder into the tertiary compound, wherein the conductive powder is preferably graphite nickel-plated conductive powder (D50 is 110), half of the graphite nickel-plated conductive powder is slowly added, after uniform mixing, one third of the rest 80# paraffin oil in the previous step is added and uniformly mixed, after full reaction, the rest half of the graphite nickel-plated conductive powder is slowly added and uniformly mixed, and the rest 80# paraffin oil is added and uniformly mixed, so that the conductive powder can fully react to generate the compound for four times;
s6, slowly adding 0.5-20 parts of conductive fiber, preferably nickel-plated carbon fiber, into the quaternary compound, and uniformly mixing to generate the quaternary compound;
s7, adding 0.2-5 parts of cross-linking assistant and 0.2-10 parts of cross-linking agent into the quintic compound to generate a sextic compound, wherein the cross-linking assistant preferably uses TAIC, and the cross-linking agent preferably uses DCP;
s8, discharging the six-time compound to obtain a sheet;
and S9, cooling the sheet to obtain the conductive fiber reinforced shielding material, taking the shielding material off the open mill in a sheet mode, and cooling to avoid that the rubber material is crosslinked in advance because the mixed heat is not dispersed in time.
The network crosslinking structure is formed by the addition reaction of non-conjugated diene added into ethylene propylene diene and DCP (peroxide). The peroxide DCP is decomposed into free radical oxygen, and double bonds of ethylene propylene diene added with non-conjugated diene are attacked, so that the double bonds are opened, and crosslinking is carried out to form a net. The net shape locks the oil, powder and the like. Finally, the conductive fiber reinforced shielding material is generated.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The conductive fiber reinforced shielding material and the corresponding method for preparing the conductive fiber reinforced shielding material provided by the present invention are described in detail above, and specific examples are applied herein to illustrate the principle and the embodiment of the present invention, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A conductive fiber reinforced shielding material is characterized by comprising the following substances in parts by mass:
100 parts of raw rubber;
2-10 parts of zinc oxide;
2-10 parts of stearic acid;
10-300 parts of reinforcing carbon black;
0.2-5 parts of a crosslinking assistant;
0.2-10 parts of a crosslinking agent;
50-200 parts of conductive powder;
0.5-20 parts of conductive fiber;
10-150 parts of a softener.
2. The conductive fiber reinforced shielding material of claim 1, wherein the green rubber is ethylene propylene diene monomer rubber.
3. The conductive fiber reinforced shielding material of claim 1, wherein the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel-carbon powder and/or silver-copper powder and/or silver-aluminum powder and/or silver-nickel powder and/or silver powder and/or nickel-aluminum powder.
4. The conductive fiber reinforced shielding material of claim 1, wherein the conductive fibers comprise carbon fibers and/or metallized carbon fibers and/or stainless steel fibers, or carbon fibers and/or metallized glass fibers.
5. The conductive fiber reinforced shielding material of claim 4, wherein the conductive fibers are used to better form a continuous overlapping conductive network inside the shielding material and to improve the mechanical properties of the shielding material.
6. The conductive fiber reinforced shielding material of claim 1, wherein the softening agent comprises a paraffinic oil and/or a pine tar oil and/or a naphthenic oil and/or an engine oil.
7. A method for preparing a conductive fiber reinforced shielding material is characterized in that the following steps are carried out on a two-roll open mill:
s1, plasticating 100 parts of ethylene propylene diene raw rubber to obtain a plasticated product;
s2, adding 2-10 parts of activating agent and 2-10 parts of stearic acid into the plasticated product to generate a primary compound;
s3, adding 10-300 parts of reinforcing carbon black into the primary compound to generate a secondary compound;
s4, taking 10-150 parts of softener, and adding one third of the softener to the secondary compound to generate a tertiary compound;
s5, sequentially taking 50-200 parts of conductive powder and the rest of softener, and sequentially and slowly adding the conductive powder and the rest of softener into the tertiary compound to generate a quaternary compound;
s6, slowly adding 0.5-20 parts of conductive fiber into the compound for the fourth time to generate a compound for the fifth time;
s7, adding 0.2-5 parts of cross-linking assistant and 0.2-10 parts of cross-linking agent into the five-time compound to generate a six-time compound;
s8, discharging the six-time compound to obtain a sheet;
s9, cooling the sheet to obtain the conductive fiber reinforced shielding material.
8. The method of manufacturing a conductive fiber reinforced shielding material according to claim 7, wherein the activator is zinc oxide;
the softening agent is paraffin oil;
the conductive powder comprises nickel powder and/or copper powder and/or aluminum powder and/or iron powder and/or nickel carbon powder and/or silver copper powder and/or silver aluminum powder and/or silver nickel powder and/or silver powder and/or nickel aluminum powder;
the conductive fiber is nickel-plated carbon fiber;
the crosslinking assistant is TAIC;
the cross-linking agent is DCP.
9. The method of claim 7, wherein the materials are added in steps S2-S7 and then mixed uniformly.
10. The method for preparing the conductive fiber reinforced shielding material of claim 7, wherein the steps of sequentially taking 50-200 parts of conductive powder and the rest of the softening agent and slowly adding the conductive powder and the rest of the softening agent into the third-order compound sequentially to generate a fourth-order compound comprise:
and sequentially taking 50-200 parts of conductive powder and the rest of softener, dividing into two times, sequentially and slowly adding the three compounds, and uniformly mixing the three compounds, the conductive powder and the softener to generate a fourth compound.
CN202011105946.6A 2020-10-15 2020-10-15 Conductive fiber reinforced shielding material and preparation method thereof Pending CN112143117A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152207A (en) * 2004-12-01 2006-06-15 Sankei Giken:Kk Electromagnetic wave-shielding rubber material
CN102206371A (en) * 2011-04-08 2011-10-05 青岛科技大学 Reclaimed rubber composite material with electromagnetic shielding performance and preparation method thereof
CN105237890A (en) * 2015-11-02 2016-01-13 深圳德邦界面材料有限公司 EPDM/PP thermoplastic elastomer with electromagnetic shielding property

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152207A (en) * 2004-12-01 2006-06-15 Sankei Giken:Kk Electromagnetic wave-shielding rubber material
CN102206371A (en) * 2011-04-08 2011-10-05 青岛科技大学 Reclaimed rubber composite material with electromagnetic shielding performance and preparation method thereof
CN105237890A (en) * 2015-11-02 2016-01-13 深圳德邦界面材料有限公司 EPDM/PP thermoplastic elastomer with electromagnetic shielding property

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