CN113896982A - Electromagnetic shielding material and preparation method thereof - Google Patents

Electromagnetic shielding material and preparation method thereof Download PDF

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Publication number
CN113896982A
CN113896982A CN202110913800.2A CN202110913800A CN113896982A CN 113896982 A CN113896982 A CN 113896982A CN 202110913800 A CN202110913800 A CN 202110913800A CN 113896982 A CN113896982 A CN 113896982A
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China
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parts
fixedly connected
gear
electromagnetic shielding
shielding material
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CN202110913800.2A
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Chinese (zh)
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聂文艳
王仲根
张文海
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Huainan Normal University
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Huainan Normal University
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Priority to CN202110913800.2A priority Critical patent/CN113896982A/en
Publication of CN113896982A publication Critical patent/CN113896982A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/425—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders using three or more screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention is applicable to the technical field of electromagnetic shielding materials, and provides an electromagnetic shielding material and a preparation method thereof. The electromagnetic shielding material comprises the following components in parts by weight: 30-50 parts of polyethylene, 15-20 parts of polyaniline, 20-30 parts of conductive filler, 15-25 parts of magnetic field shielding filler, 1-3 parts of coupling agent, 3-5 parts of adhesive, 2-3 parts of antioxidant, 1-2 parts of toughening agent and 1-3 parts of flame retardant. The electromagnetic shielding material and the preparation method thereof provided by the invention have the advantages of easily available raw materials, simple steps and convenience in operation, solve the problems of complicated preparation process, long manufacturing process and high production cost of the traditional electromagnetic shielding material, have good mechanical strength, strong corrosion resistance and oxidation resistance, strong fire resistance and capability of reducing potential safety hazards caused by fire.

Description

Electromagnetic shielding material and preparation method thereof
Technical Field
The invention belongs to the technical field of electromagnetic shielding materials, and particularly relates to an electromagnetic shielding material and a preparation method thereof.
Background
With the development of modern science and technology and electronic industry, more and more electronic products enter our lives, bring great convenience to our lives and bring invisible and inaudible pollution, namely electromagnetic pollution. The electromagnetic interference generated by the electromagnetic radiation not only easily affects the performance of electronic products, but also affects communication, causes instrument failure and the like; electromagnetic pollution from electromagnetic radiation can also cause diseases in humans and other organisms. Electromagnetic protection is performed on communication equipment in many national defense fields, and proper electromagnetic protection is also required for some important monitoring equipment and research laboratories.
At present, the traditional electromagnetic shielding method relies on the use of metal materials, and the purpose of the method is to play a certain role in absorbing, reflecting and consuming low energy for external interfering electromagnetic waves and internal electromagnetic waves in order to attenuate electromagnetic radiation, but the metal materials inevitably generate weight burden.
In the related art, most of the existing electromagnetic shielding materials have the defects of complicated preparation process, long manufacturing process and high production cost, and the manufactured electromagnetic shielding materials have the defects of poor oxidation resistance and poor fire resistance, are easy to corrode and are unstable in use.
Disclosure of Invention
The invention provides an electromagnetic shielding material and a preparation method thereof, and aims to solve the problems of complicated preparation process, long manufacturing process and high production cost.
The invention is realized in such a way that the electromagnetic shielding material comprises the following components in parts by weight:
30-50 parts of polyethylene, 15-20 parts of polyaniline, 20-30 parts of conductive filler, 15-25 parts of magnetic field shielding filler, 1-3 parts of coupling agent, 3-5 parts of adhesive, 2-3 parts of antioxidant, 1-2 parts of toughening agent and 1-3 parts of flame retardant.
Preferably, the composition comprises the following components by weight: 40 parts of polyethylene, 20 parts of polyaniline, 23 parts of conductive filler, 18 parts of magnetic field shielding filler, 2 parts of coupling agent, 3 parts of adhesive, 2 parts of antioxidant, 2 parts of toughening agent and 2 parts of flame retardant.
Preferably, the adhesive is one or a mixture of more of pure acrylic emulsion, styrene-acrylic emulsion and waterborne polyurethane.
Preferably, the antioxidant is a hindered phenol antioxidant or a phosphite antioxidant.
Preferably, the toughening agent is one or a mixture of polyvinyl butyral, polyether sulfone, polyphenylene ether ketone and polyvinyl alcohol.
Preferably, the flame retardant is one or a mixture of more of magnesium hydroxide, aluminum hydroxide ammonium polyphosphate, octabromoether, triphenyl phosphate and hexabromocyclododecane.
A preparation method of an electromagnetic shielding material comprises the electromagnetic shielding material, and the preparation method of the electromagnetic shielding material is needed when the electromagnetic shielding material is prepared, and comprises the following steps:
s1, weighing the raw materials according to the weight ratio, firstly putting polyethylene, polyaniline, conductive filler, magnetic field shielding filler and coupling agent into an organic solvent, and mixing and stirring by adopting stirring equipment;
s2, adding the adhesive, the antioxidant, the toughening agent and the flame retardant, and continuously mixing and stirring;
and S3, after stirring, extruding the mixture through a double-screw extruder to obtain the electromagnetic shielding material.
Preferably, the double-screw extruder in the S3 comprises a base, a support frame is fixedly connected to the top of the base, a housing is fixedly connected to the top of the support frame, a first screw and a second screw are sequentially connected between two sides of the inner wall of the housing from top to bottom in a rotating manner, a discharge nozzle is arranged on the right side of the housing, a fixed frame is fixedly connected to the left side of the top of the base, one ends of the first screw and the second screw sequentially penetrate through the housing and the fixed frame and extend into the fixed frame, first belt pulleys are fixedly connected to the outer surfaces of the first screw and the second screw, a belt is arranged between the outer surfaces of the two first belt pulleys, a first gear and a second gear are sequentially and fixedly connected to the outer surface of the second screw and positioned on the left side of the first belt pulley from left to right, and a L template is fixedly connected to the left side of the fixed frame, the left side of the inner wall of the L-shaped plate is fixedly connected with a driving motor which is connected with an external power supply through a control switch, the output shaft of the driving motor is fixedly connected with a first rotating rod, one end of the first rotating rod penetrates through the fixed frame and extends into the fixed frame, the outer surface of one end of the first rotating rod extending to the inside of the fixing frame is connected with a sliding sleeve in a sliding way, a third gear and a fourth gear are fixedly connected on the outer surface of the sliding sleeve from left to right in sequence, a sliding plate is rotatably connected on the outer surface of the sliding sleeve and on the side opposite to the third gear and the fourth gear, the bottom of the sliding plate is connected to the bottom of the inner wall of the fixed frame in a sliding mode, an electric telescopic rod is fixedly connected to the right side of the inner wall of the fixed frame and connected with an external power source through a control switch, and the other end of the electric telescopic rod is fixed to the right side of the sliding plate.
Preferably, the diameter of the first gear is larger than that of the third gear, and the diameter of the second gear is smaller than that of the fourth gear.
Preferably, the top of the housing is fixedly connected with a support plate, the left side of the support plate is fixedly connected with a material hopper, the bottom of the material hopper is rotatably connected with a sleeve, the bottom of the sleeve penetrates through the housing and extends into the housing, the sleeve is rotatably connected with the housing, the outer surface of the sleeve is fixedly connected with a second belt pulley, an auxiliary plate is fixedly connected between two sides of the inner wall of the sleeve, the tops of the two auxiliary plates are fixedly connected with a third screw rod, the top end of the third screw rod extends into the material hopper, the outer surface of the first screw rod is fixedly connected with a worm gear on the left side of the first belt pulley, the top of the fixed frame is rotatably connected with a second rotating rod, the outer surface of the second rotating rod is fixedly connected with a third belt pulley, the bottom end of the second rotating rod penetrates through the fixed frame and extends into the fixed frame, the bottom end of the second rotating rod is fixedly connected with a worm, and the outer surface of the worm is meshed with the outer surface of the worm wheel.
Compared with the prior art, the invention has the beneficial effects that:
(1) the electromagnetic shielding material and the preparation method thereof have the advantages of easily available raw materials, simple steps and convenient operation, solve the problems of complicated preparation process, long manufacturing process and high production cost of the traditional electromagnetic shielding material, have good mechanical strength, strong corrosion resistance and oxidation resistance and strong fire resistance, and reduce the potential safety hazard caused by fire;
(2) the invention relates to an electromagnetic shielding material and a preparation method thereof, wherein when a double-screw extruder is used: the material feeding device comprises a material hopper, a first rotating rod, a second rotating rod, a sleeve, a first belt pulley, a second belt pulley, a first gear, a second gear, a third gear, a worm, a sleeve and a first rotating rod, wherein a mixed material is guided into the material hopper, then the first rotating rod is driven to rotate by the rotation of a driving motor, so that a sliding sleeve is rotated, the sliding sleeve drives the third gear to rotate, the third gear drives the first gear to rotate, the second gear drives the second belt pulley to rotate, the sleeve rotates, the third screw rotates, the mixed material is conveyed downwards, the mixed material can be conveyed by the rotation of the third screw, and the blocking condition in the blanking process can be prevented;
through electric telescopic handle's extension, make the sliding plate move left, thereby make the sliding sleeve move left, thereby make third gear and fourth gear move left simultaneously, third gear and first gear no longer mesh, fourth gear and second gear meshing, thereby make the rotational speed of second screw rod and first screw rod improve, and then indirectly make the rotational speed of third screw rod improve, thereby make the extrusion rate of mixture increase, made things convenient for the regulation of extruding speed, and can link the third screw rod and carry out transport rate's regulation.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic view of the structure of a twin-screw extruder in the present invention;
FIG. 3 is a schematic view of the internal structure of the sleeve shown in FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
fig. 5 is a schematic view of the internal structure of the hopper shown in fig. 2.
In the figure: 1-base, 2-support frame, 3-shell, 4-first screw, 5-second screw, 6-discharge nozzle, 7-fixed frame, 8-first belt pulley, 9-first gear, 10-second gear, 11-L template, 12-driving motor, 13-first rotating rod, 14-sliding sleeve, 15-third gear, 16-fourth gear, 17-sliding plate, 18-electric telescopic rod, 19-support plate, 20-material hopper, 21-sleeve, 22-second belt pulley, 23-connecting rod, 24-third screw, 25-worm wheel, 26-second rotating rod, 27-third belt pulley and 28-worm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-4, the present invention provides a technical solution of an electromagnetic shielding material: comprises the following components by weight:
30-50 parts of polyethylene, 15-20 parts of polyaniline, 20-30 parts of conductive filler, 15-25 parts of magnetic field shielding filler, 1-3 parts of coupling agent, 3-5 parts of adhesive, 2-3 parts of antioxidant, 1-2 parts of toughening agent and 1-3 parts of flame retardant.
Comprises the following components by weight: 40 parts of polyethylene, 20 parts of polyaniline, 23 parts of conductive filler, 18 parts of magnetic field shielding filler, 2 parts of coupling agent, 3 parts of adhesive, 2 parts of antioxidant, 2 parts of toughening agent and 2 parts of flame retardant.
The adhesive is one or a mixture of more of pure acrylic emulsion, styrene-acrylic emulsion and waterborne polyurethane.
The antioxidant is hindered phenol antioxidant or phosphite antioxidant.
The toughening agent is one or a mixture of polyvinyl butyral, polyether sulfone, polyphenylene ether ketone and polyvinyl alcohol.
The flame retardant is one or a mixture of magnesium hydroxide, aluminum hydroxide ammonium polyphosphate, octabromoether, triphenyl phosphate and hexabromocyclododecane.
A preparation method of an electromagnetic shielding material comprises the electromagnetic shielding material, and the preparation method of the electromagnetic shielding material is needed when the electromagnetic shielding material is prepared, and comprises the following steps:
s1, weighing the raw materials according to the weight ratio, firstly putting polyethylene, polyaniline, conductive filler, magnetic field shielding filler and coupling agent into an organic solvent, and mixing and stirring by adopting stirring equipment;
s2, adding the adhesive, the antioxidant, the toughening agent and the flame retardant, and continuously mixing and stirring;
and S3, after stirring, extruding the mixture through a double-screw extruder to obtain the electromagnetic shielding material.
The double-screw extruder in the S3 comprises a base 1, a support frame 2 is fixedly connected to the top of the base 1, a shell 3 is fixedly connected to the top of the support frame 2, a first screw rod 4 and a second screw rod 5 are sequentially and rotatably connected between two sides of the inner wall of the shell 3 from top to bottom, a discharge nozzle 6 is arranged on the right side of the shell 3, a fixed frame 7 is fixedly connected to the left side of the top of the base 1, one end of each of the first screw rod 4 and the second screw rod 5 sequentially penetrates through the shell 3 and the fixed frame 7 and extends into the fixed frame 7, a first belt pulley 8 is fixedly connected to the outer surface of each of the first screw rod 4 and the second screw rod 5, a first gear 9 and a second gear 10 are sequentially and fixedly connected to the left side of the first belt pulley 8 and the right side of the outer surface of the second screw rod 5, a template L11 is fixedly connected to the left side of the fixed frame 7, the left side of the inner wall of the L-shaped plate 11 is fixedly connected with a driving motor 12, the output shaft of the driving motor 12 is fixedly connected with a first rotating rod 13, one end of the first rotation rod 13 penetrates the fixing frame 7 and extends to the inside of the fixing frame 7, the outer surface of the first rotating rod 13 extending to one end inside the fixing frame 7 is connected with a sliding sleeve 14 in a sliding way, a third gear 15 and a fourth gear 16 are fixedly connected to the outer surface of the sliding sleeve 14 from left to right in sequence, a sliding plate 17 is rotatably connected to the outer surface of the sliding sleeve 14 on the side opposite to the third gear 15 and the fourth gear 16, the bottom of the sliding plate 17 is slidably connected to the bottom of the inner wall of the fixed frame 7, an electric telescopic rod 18 is fixedly connected to the right side of the inner wall of the fixed frame 7, and the other end of the electric telescopic rod 18 is fixed to the right side of the sliding plate 17.
The sliding plate 17 can be driven to move leftwards by the extension of the electric telescopic rod 18, so that the sliding sleeve 14 moves leftwards, the third gear 15 is separated from the first gear 9, the fourth gear 16 is meshed with the second gear 10, when the electric telescopic rod 18 contracts, the sliding plate 17 can be driven to move rightwards, so that the sliding sleeve 14 moves rightwards, the third gear 15 is reset and meshed with the first gear 9, and the fourth gear 16 is separated from the second gear 10, so that the rotating speed is adjusted.
The diameter of the first gear 9 is larger than the diameter of the third gear 15, and the diameter of the second gear 10 is smaller than the diameter of the fourth gear 16.
The first gear 9 is matched with the third gear 15, the second gear 10 is matched with the fourth gear 16, when the first gear 9 is meshed with the third gear 15, the third gear 15 rotates to drive the first gear 9 to rotate, and when the second gear 10 is meshed with the fourth gear 16, the fourth gear 16 rotates to drive the second gear 10 to rotate.
The top of the housing 3 is fixedly connected with a supporting plate 19, the left side of the supporting plate 19 is fixedly connected with a material hopper 20, the bottom of the material hopper 20 is rotatably connected with a sleeve 21, the bottom of the sleeve 21 penetrates through the housing 3 and extends into the housing 3, the sleeve 21 is rotatably connected with the housing 3, the outer surface of the sleeve 21 is fixedly connected with a second belt pulley 22, an auxiliary plate 23 is fixedly connected between two sides of the inner wall of the sleeve 21, the tops of the two auxiliary plates 23 are fixedly connected with third screw rods 24, the top ends of the third screw rods 24 extend into the material hopper 20, the outer surface of the first screw rod 4 is fixedly connected with a worm wheel 25 on the left side of the first belt pulley 8, the top of the fixing frame 7 is rotatably connected with a second rotating rod 26, and the outer surface of the second rotating rod 26 is fixedly connected with a third belt pulley 27, the bottom end of the second rotating rod 26 penetrates through the fixed frame 7 and extends to the inside of the fixed frame 7, and the bottom end of the second rotating rod 26 is fixedly connected with a worm 28.
Can play the supporting role to material hopper 20 through the setting of backup pad 19 to restriction material hopper 20 is unable rotatory, thereby can not drive material hopper 20 rotatory when sleeve 21 is rotatory, and sleeve 21 can drive the rotation of third screw rod 24 when rotatory, thereby can carry the mixture to shell 3 inside, can also play the effect of preventing blockking up when improving unloading speed.
The working principle and the using process of the invention are as follows: firstly, weighing raw materials according to a weight ratio, firstly putting polyethylene, polyaniline, a conductive filler, a magnetic field shielding filler and a coupling agent into an organic solvent, and mixing and stirring by adopting stirring equipment; then adding the adhesive, the antioxidant, the toughening agent and the flame retardant to continue mixing and stirring; and after stirring, extruding the mixture by a double-screw extruder to obtain the electromagnetic shielding material.
Twin screw extruder when used: the mixture is guided into the material hopper 20, and then the driving motor 12 is started, the driving motor 12 rotates to drive the first rotating rod 13 to rotate, so that the sliding sleeve 14 rotates, the sliding sleeve 14 rotates to drive the third gear 15 to rotate, the third gear 15 drives the first gear 9 to rotate, so that the second screw 5 rotates, the first screw 4 rotates by matching with the use of the two first belt pulleys 8, so that the mixture is extruded out through the discharging nozzle 6, the worm wheel 25 also drives the worm wheel 25 to rotate when the first screw 4 rotates, the worm wheel 25 drives the worm 28 to rotate, so that the second rotating rod 26 rotates, the third belt pulley 27 and the second belt pulley 22 are matched, so that the sleeve 21 rotates, the third screw 24 rotates, and the mixture is conveyed downwards;
by extending the electric telescopic rod 18, the sliding plate 17 moves leftwards, so that the sliding sleeve 14 moves leftwards, the third gear 15 and the fourth gear 16 move leftwards simultaneously, the third gear 15 is not meshed with the first gear 9, the fourth gear 16 is meshed with the second gear 10, the rotating speeds of the second screw rod 5 and the first screw rod 4 are increased, the rotating speed of the third screw rod 24 is indirectly increased, and the extrusion speed of the mixture is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An electromagnetic shielding material, characterized in that: comprises the following components by weight:
30-50 parts of polyethylene, 15-20 parts of polyaniline, 20-30 parts of conductive filler, 15-25 parts of magnetic field shielding filler, 1-3 parts of coupling agent, 3-5 parts of adhesive, 2-3 parts of antioxidant, 1-2 parts of toughening agent and 1-3 parts of flame retardant.
2. An electromagnetic shielding material as set forth in claim 1, wherein: comprises the following components by weight: 40 parts of polyethylene, 20 parts of polyaniline, 23 parts of conductive filler, 18 parts of magnetic field shielding filler, 2 parts of coupling agent, 3 parts of adhesive, 2 parts of antioxidant, 2 parts of toughening agent and 2 parts of flame retardant.
3. An electromagnetic shielding material as set forth in claim 1, wherein: the adhesive is one or a mixture of more of pure acrylic emulsion, styrene-acrylic emulsion and waterborne polyurethane.
4. An electromagnetic shielding material as set forth in claim 1, wherein: the antioxidant is hindered phenol antioxidant or phosphite antioxidant.
5. An electromagnetic shielding material as set forth in claim 1, wherein: the toughening agent is one or a mixture of polyvinyl butyral, polyether sulfone, polyphenylene ether ketone and polyvinyl alcohol.
6. An electromagnetic shielding material as set forth in claim 1, wherein: the flame retardant is one or a mixture of magnesium hydroxide, aluminum hydroxide ammonium polyphosphate, octabromoether, triphenyl phosphate and hexabromocyclododecane.
7. The preparation method of the electromagnetic shielding material is characterized by comprising the following steps: the electromagnetic shielding material according to any one of claims 1 to 6, comprising the following steps:
s1, weighing the raw materials according to the weight ratio, firstly putting polyethylene, polyaniline, conductive filler, magnetic field shielding filler and coupling agent into an organic solvent, and mixing and stirring by adopting stirring equipment;
s2, adding the adhesive, the antioxidant, the toughening agent and the flame retardant, and continuously mixing and stirring;
and S3, after stirring, extruding the mixture through a double-screw extruder to obtain the electromagnetic shielding material.
8. The method for preparing an electromagnetic shielding material according to claim 7, wherein: double screw extruder includes base (1) in S3, top fixedly connected with support frame (2) of base (1), top fixedly connected with shell (3) of support frame (2), from last to rotating in proper order down between the both sides of shell (3) inner wall and being connected with first screw rod (4) and second screw rod (5), the right side of shell (3) is provided with ejection of compact mouth (6), the fixed frame (7) of left side fixedly connected with at base (1) top, first screw rod (4) with the one end of second screw rod (5) all runs through in proper order shell (3) with fixed frame (7) extend to the inside of fixed frame (7), first screw rod (4) with the equal fixedly connected with first belt pulley (8) of surface of second screw rod (5), the surface of second screw rod (5) just is located the left side of first belt pulley (8) is from a left side fixedly connected with first gear (S) to the right side in proper order (8), (8) 9) And a second gear (10), the left side of the fixed frame (7) is fixedly connected with an L-shaped plate (11), the left side of the inner wall of the L-shaped plate (11) is fixedly connected with a driving motor (12), the output shaft of the driving motor (12) is fixedly connected with a first rotating rod (13), one end of the first rotating rod (13) penetrates through the fixed frame (7) and extends to the inside of the fixed frame (7), the outer surface of the first rotating rod (13) extending to the inside end of the fixed frame (7) is slidably connected with a sliding sleeve (14), the outer surface of the sliding sleeve (14) is fixedly connected with a third gear (15) and a fourth gear (16) from left to right in sequence, the outer surface of the sliding sleeve (14) is positioned on the opposite side of the third gear (15) and the fourth gear (16) and is rotatably connected with a sliding plate (17), the bottom of the sliding plate (17) is slidably connected with the bottom of the inner wall of the fixed frame (7), the right side of the inner wall of the fixed frame (7) is fixedly connected with an electric telescopic rod (18), and the other end of the electric telescopic rod (18) is fixed on the right side of the sliding plate (17).
9. The method for preparing an electromagnetic shielding material according to claim 8, wherein: the diameter of the first gear (9) is greater than the diameter of the third gear (15), and the diameter of the second gear (10) is less than the diameter of the fourth gear (16).
10. The method for preparing an electromagnetic shielding material according to claim 8, wherein: the top of the shell (3) is fixedly connected with a supporting plate (19), the left side of the supporting plate (19) is fixedly connected with a material hopper (20), the bottom of the material hopper (20) is rotatably connected with a sleeve (21), the bottom of the sleeve (21) penetrates through the shell (3) and extends into the shell (3), the sleeve (21) is rotatably connected with the shell (3), the outer surface of the sleeve (21) is fixedly connected with a second belt pulley (22), an auxiliary plate (23) is fixedly connected between two sides of the inner wall of the sleeve (21), the tops of the two auxiliary plates (23) are fixedly connected with third screw rods (24), the top ends of the third screw rods (24) extend into the material hopper (20), the outer surface of the first screw rod (4) is fixedly connected with a worm wheel (25) on the left side of the first belt pulley (8), the top of fixed frame (7) is rotated and is connected with second dwang (26), the external fixed surface of second dwang (26) is connected with third belt pulley (27), the bottom of second dwang (26) is run through fixed frame (7) and is extended to the inside of fixed frame (7), the bottom fixedly connected with worm (28) of second dwang (26).
CN202110913800.2A 2021-08-10 2021-08-10 Electromagnetic shielding material and preparation method thereof Pending CN113896982A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101684188A (en) * 2008-09-25 2010-03-31 深圳市新纶科技股份有限公司 Polyaniline type electromagnetic shielding plastics
CN111844657A (en) * 2020-07-17 2020-10-30 宁波市海达塑料机械有限公司 Double-screw extrusion mechanism of large-injection-amount extrusion and injection integrated injection molding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101684188A (en) * 2008-09-25 2010-03-31 深圳市新纶科技股份有限公司 Polyaniline type electromagnetic shielding plastics
CN111844657A (en) * 2020-07-17 2020-10-30 宁波市海达塑料机械有限公司 Double-screw extrusion mechanism of large-injection-amount extrusion and injection integrated injection molding machine

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