CN117511045A - Carbon fiber electromagnetic shielding composite material applicable to optical cable - Google Patents

Carbon fiber electromagnetic shielding composite material applicable to optical cable Download PDF

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CN117511045A
CN117511045A CN202410010532.7A CN202410010532A CN117511045A CN 117511045 A CN117511045 A CN 117511045A CN 202410010532 A CN202410010532 A CN 202410010532A CN 117511045 A CN117511045 A CN 117511045A
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electromagnetic shielding
carbon fiber
parts
composite material
shielding composite
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CN117511045B (en
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孟强
杜敬亮
申亚慧
尹会凯
李兴旺
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Hebei Shanghua New Materials Co ltd
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Hebei Shanghua New Materials Co ltd
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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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/085—Copper
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/322—Ammonium phosphate
    • C08K2003/323—Ammonium polyphosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/387—Borates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating

Abstract

The invention relates to the technical field of composite materials, and provides a carbon fiber electromagnetic shielding composite material applicable to an optical cable, which comprises a flame retardant layer and an electromagnetic shielding layer which are sequentially arranged from outside to inside; the raw materials of the flame-retardant layer comprise the following components: polyethylene, hydrogenated styrene-butadiene-styrene copolymer, hydrogenated petroleum resin, acrylonitrile-butadiene-styrene copolymer, polyacrylamide, flame retardant, and processing aid; the electromagnetic shielding layer comprises the following raw materials: polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, carbon fiber and copper powder. By the technical scheme, the problem that the electromagnetic shielding composite material in the prior art is poor in mechanical property, flame retardant property and electromagnetic shielding property is solved.

Description

Carbon fiber electromagnetic shielding composite material applicable to optical cable
Technical Field
The invention relates to the technical field of composite materials, in particular to a carbon fiber electromagnetic shielding composite material applicable to an optical cable.
Background
Optical cable is a carrier for realizing modern communication and data transmission, and plays a significant role in the field of information technology. With the rapid development of information technology, the production and life of the optical cable have put higher requirements on electromagnetic shielding performance. Currently, the provision of a metal braid is a common method for enhancing the electromagnetic shielding performance of an optical cable. But the metal woven net has the defects of easy corrosion, difficult control of shielding effect, complex processing procedures, low overall roundness of wires and the like. The carbon fiber has good conductivity and can be used for preparing electromagnetic shielding composite materials. The preparation of the carbon fiber electromagnetic shielding composite material becomes a novel development strategy for replacing the metal woven mesh shielding layer.
The carbon fiber electromagnetic shielding composite material has excellent electromagnetic shielding performance and good flame retardance and mechanical property. However, in general, the proportion of the filler in the carbon fiber electromagnetic shielding composite is large, which leads to the carbon fiber electromagnetic shielding composite to often generate cracks of a carbon layer when being burnt, and the flame retardant property is greatly reduced. In addition, more fillers can reduce the melt flow property of the carbon fiber electromagnetic shielding composite material, and cause great impact on the mechanical property of the carbon fiber electromagnetic shielding composite material. Therefore, the development of the carbon fiber electromagnetic shielding composite material with excellent mechanical property, excellent flame retardant property and good electromagnetic shielding property has important significance.
Disclosure of Invention
The invention provides a carbon fiber electromagnetic shielding composite material applicable to an optical cable, which comprises a flame retardant layer and an electromagnetic shielding layer which are sequentially arranged from outside to inside;
the flame-retardant layer comprises the following raw materials in parts by weight: 40-60 parts of polyethylene, 20-30 parts of hydrogenated styrene-butadiene-styrene copolymer, 20-30 parts of hydrogenated petroleum resin, 10-20 parts of acrylonitrile-butadiene-styrene copolymer, 10-20 parts of polyacrylamide, 120-140 parts of flame retardant and 2-4 parts of processing aid;
the electromagnetic shielding layer comprises the following raw materials in parts by weight: 30-60 parts of polyethylene, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of ethylene-vinyl alcohol copolymer, 20-30 parts of carbon fiber and 10-20 parts of copper powder.
As a further technical scheme, the copper powder is polyvinyl butyral modified copper powder, and the preparation method of the polyvinyl butyral modified copper powder comprises the following steps: and dissolving polyvinyl butyral in acetone, uniformly mixing, adding copper powder, uniformly dispersing, concentrating, solidifying, crushing and grinding to obtain the polyvinyl butyral modified copper powder.
As a further technical scheme, the mass ratio of the polyvinyl butyral to the copper powder is 1:4-2:3.
When the mass ratio of the polyvinyl butyral to the copper powder is 1:4-2:3, the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material can be further enhanced.
As a further technical scheme, the specific surface area of the polyvinyl butyral modified copper powder is 200-300 m 2 /kg。
When the specific surface area of the polyvinyl butyral modified copper powder is 200-300 m 2 At/kg, the polyvinyl butyral modified copper powder is better attached to carbonThe surface of the fiber is more beneficial to the dispersion of copper powder and carbon fiber in the electromagnetic shielding layer, so that the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material is further enhanced.
As a further technical scheme, the flame retardant is formed by mixing aluminum hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate and melamine cyanurate in a mass ratio of 80:10:5:3:2.
The flame retardant formed by mixing inorganic and organic materials can better enhance the flame retardant property of the carbon fiber electromagnetic shielding composite material.
As a further technical scheme, the processing aid is formed by mixing polyethylene wax, silicone master batch, antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1:1:1.
The addition of the processing aid is beneficial to improving the stability of the flame-retardant layer and prolonging the service life of the carbon fiber electromagnetic shielding composite material.
As a further technical scheme, the thickness of the electromagnetic shielding layer is 0.42-1 mm.
The invention also provides a preparation method of the carbon fiber electromagnetic shielding composite material applicable to the optical cable, which comprises the following steps:
s1, granulating: uniformly mixing the raw materials of the flame-retardant layer, carrying out banburying, first extrusion and first granulation to obtain flame-retardant layer particles, uniformly mixing the raw materials of the electromagnetic shielding layer, and carrying out second extrusion and second granulation to obtain the electromagnetic shielding layer particles;
s2, preparing a carbon fiber electromagnetic shielding composite material: and taking the flame-retardant layer particles as an outer layer material and the electromagnetic shielding layer particles as an inner layer material, and performing double-layer co-extrusion to obtain the carbon fiber electromagnetic shielding composite material.
As a further technical scheme, in the step S1, the temperature is 150-165 ℃ during banburying.
As a further technical scheme, in the step S1, during the first extrusion, the extrusion temperature is 100-150 ℃;
and in the second extrusion, the extrusion temperature is 130-190 ℃.
As a further technical scheme, in the step S2, when the double layers are co-extruded, the extrusion temperature of the flame-retardant layer is 120-170 ℃;
the extrusion temperature of the electromagnetic shielding layer is 140-180 ℃.
The invention also provides application of the carbon fiber electromagnetic shielding composite material applicable to the optical cable in the optical cable.
The working principle and the beneficial effects of the invention are as follows:
1. in the invention, the carbon fiber electromagnetic shielding composite material comprises a flame retardant layer and an electromagnetic shielding layer which are sequentially arranged from outside to inside, wherein:
(1) The ethylene-vinyl alcohol copolymer in the electromagnetic shielding layer can form cross-linking with the polyacrylamide and the acrylonitrile-butadiene-styrene copolymer in the flame retardant layer, so that the bonding capability of the electromagnetic shielding layer and the flame retardant layer is improved, and the tensile strength and the elongation at break of the carbon fiber electromagnetic shielding composite material are enhanced integrally;
(2) The polyacrylamide in the flame-retardant layer can improve the dispersion of the flame retardant in the flame-retardant layer, and the flame-retardant effect is enhanced;
(3) Copper powder and carbon fiber in the electromagnetic shielding layer can enhance the conductivity of the electromagnetic shielding layer, so that the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material is enhanced.
2. According to the invention, the polyvinyl butyral is used for carrying out surface modification on the copper powder, so that the adhesion capability of the copper powder on the surface of the carbon fiber is enhanced, and the dispersion of the copper powder and the carbon fiber in the electromagnetic shielding layer is promoted, thereby further enhancing the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples and comparative examples, the polyethylene brand is DFDA-7042 unless otherwise specified; hydrogenated styrene-butadiene-styrene copolymer was purchased from dews new materials limited, guangzhou under the trade designation FG1924X; hydrogenated petroleum resin was purchased from Shandong Starfish chemical Co., ltd, trade name XH-02; the acrylonitrile-butadiene-styrene copolymer was purchased from Ningbo sharing plasticization Co., ltd, trade name TR-530F; polyacrylamide is purchased from Zibo Wanzun environmental protection materials Co., ltd, and the brand is WZ001; the particle size of the aluminum hydroxide is 10 mu m; the particle size of the magnesium hydroxide is 10 mu m; the purity of the zinc borate is 99%; ammonium polyphosphate is purchased from Shandong Shijia technology Co., ltd, and has the brand number HT-208; melamine cyanurate is purchased from Guangzhou tiger New Material Co., ltd, under the trademark FR-MCA10; the brand of the polyethylene wax is NV-202P; the brand of the silicone master batch is MB50-002; antioxidant 1010 with purity not less than 98%; the purity of the antioxidant 168 is more than or equal to 99 percent; the ethylene-vinyl acetate copolymer is named EVA-7A50H; the ethylene-vinyl alcohol copolymer is marked as F101A; the length of the carbon fiber is 0.5mm; the particle size of the copper powder is 50 mu m; polyvinyl butyral is available from neutralization chemistry (Shandong) under the trade designation ZH63148.
Example 1
The preparation method of the carbon fiber electromagnetic shielding composite material applicable to the optical cable comprises the following steps of:
s1, granulating: uniformly mixing 40 parts of polyethylene, 20 parts of hydrogenated styrene-butadiene-styrene copolymer, 20 parts of hydrogenated petroleum resin, 10 parts of acrylonitrile-butadiene-styrene copolymer, 10 parts of polyacrylamide, 120 parts of flame retardant and 2 parts of processing aid, carrying out banburying, first extrusion and first granulation to obtain flame-retardant layer particles, uniformly mixing 30 parts of polyethylene, 20 parts of ethylene-vinyl acetate copolymer, 10 parts of ethylene-vinyl alcohol copolymer, 20 parts of carbon fiber and 10 parts of copper powder, and carrying out second extrusion and second granulation to obtain electromagnetic shielding layer particles;
wherein the flame retardant is formed by mixing aluminum hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate and melamine cyanurate in a mass ratio of 80:10:5:3:2;
the processing aid is formed by mixing polyethylene wax, silicone master batch, antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1:1:1;
the temperature during banburying is 150 ℃, and the temperatures of all areas of the extruder during first extrusion are as follows: the temperature of the first area is 100 ℃, the temperature of the second area is 120 ℃, the temperature of the third area is 150 ℃, the temperature of the machine head is 140 ℃, and the temperatures of all areas of the extruder during the second extrusion are as follows: the first temperature is 130 ℃, the second temperature is 150 ℃, the third temperature is 190 ℃ and the head temperature is 170 ℃;
s2, preparing a carbon fiber electromagnetic shielding composite material: taking the flame-retardant layer particles as an outer layer material and the electromagnetic shielding layer particles as an inner layer material, and performing double-layer co-extrusion to obtain a carbon fiber electromagnetic shielding composite material;
wherein, when double-deck coextrusion, the temperature of each district of extruder when fire-retardant layer extrudes is in proper order: the temperature of the first area is 120 ℃, the temperature of the second area is 140 ℃, the temperature of the third area is 170 ℃, the temperature of the machine head is 160 ℃, and the thickness of the flame-retardant layer is 0.58mm; the temperature of each region of the extruder during extrusion of the electromagnetic shielding layer is as follows in sequence: the temperature of the first area is 140 ℃, the temperature of the second area is 160 ℃, the temperature of the third area is 180 ℃, the temperature of the machine head is 170 ℃, and the thickness of the electromagnetic shielding layer is 0.42mm.
Example 2
The preparation method of the carbon fiber electromagnetic shielding composite material applicable to the optical cable comprises the following steps of:
s1, granulating: uniformly mixing 60 parts of polyethylene, 30 parts of hydrogenated styrene-butadiene-styrene copolymer, 30 parts of hydrogenated petroleum resin, 20 parts of acrylonitrile-butadiene-styrene copolymer, 20 parts of polyacrylamide, 140 parts of flame retardant and 4 parts of processing aid, carrying out banburying, first extrusion and first granulation to obtain flame-retardant layer particles, uniformly mixing 60 parts of polyethylene, 30 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene-vinyl alcohol copolymer, 30 parts of carbon fiber and 20 parts of copper powder, and carrying out second extrusion and second granulation to obtain electromagnetic shielding layer particles;
wherein the flame retardant is formed by mixing aluminum hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate and melamine cyanurate in a mass ratio of 80:10:5:3:2;
the processing aid is formed by mixing polyethylene wax, silicone master batch, antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1:1:1;
the temperature during banburying is 165 ℃, and the temperatures of all areas of the extruder during first extrusion are as follows: the temperature of the first area is 100 ℃, the temperature of the second area is 120 ℃, the temperature of the third area is 150 ℃, the temperature of the machine head is 140 ℃, and the temperatures of all areas of the extruder during the second extrusion are as follows: the first temperature is 130 ℃, the second temperature is 150 ℃, the third temperature is 190 ℃ and the head temperature is 170 ℃;
s2, preparing a carbon fiber electromagnetic shielding composite material: taking the flame-retardant layer particles as an outer layer material and the electromagnetic shielding layer particles as an inner layer material, and performing double-layer co-extrusion to obtain a carbon fiber electromagnetic shielding composite material;
wherein, when double-deck coextrusion, the temperature of each district of extruder when fire-retardant layer extrudes is in proper order: the temperature of the first area is 120 ℃, the temperature of the second area is 140 ℃, the temperature of the third area is 170 ℃, the temperature of the machine head is 160 ℃, and the thickness of the flame-retardant layer is 1mm; the temperature of each region of the extruder during extrusion of the electromagnetic shielding layer is as follows in sequence: the temperature of the first area is 140 ℃, the temperature of the second area is 160 ℃, the temperature of the third area is 180 ℃, the temperature of the machine head is 170 ℃, and the thickness of the electromagnetic shielding layer is 1mm.
Example 3
The difference between this example and example 2 is only that in step S1 of this example, the copper powder is polyvinyl butyral modified copper powder;
the preparation method of the polyvinyl butyral modified copper powder comprises the following steps: according to the weight parts, 2 parts of polyvinyl butyral is dissolved in 10 parts of acetone, evenly mixed, added with 18 parts of copper powder, evenly dispersed by ultrasonic, concentrated and solidified, and crushed and ground to 150m of surface area 2 And (3) per kg, obtaining polyvinyl butyral modified copper powder.
Example 4
The difference between this example and example 2 is only that in step S1 of this example, the copper powder is polyvinyl butyral modified copper powder;
the preparation method of the polyvinyl butyral modified copper powder comprises the following steps: according to the weight parts, 10 parts of polyvinyl butyral is dissolved in 50 parts of acetone, evenly mixed, evenly dispersed by adding 10 parts of copper powder, concentrated and solidified, and crushed and ground until the surface area is 150m 2 And (3) per kg, obtaining polyvinyl butyral modified copper powder.
Example 5
The difference between this example and example 2 is only that in step S1 of this example, the copper powder is polyvinyl butyral modified copper powder;
the preparation method of the polyvinyl butyral modified copper powder comprises the following steps: according to the weight parts, 4 parts of polyvinyl butyral is dissolved in 20 parts of acetone, evenly mixed, added with 16 parts of copper powder, evenly dispersed by ultrasonic, concentrated and solidified, and crushed and ground to 150m of surface area 2 And (3) per kg, obtaining polyvinyl butyral modified copper powder.
Example 6
The difference between this example and example 2 is only that in step S1 of this example, the copper powder is polyvinyl butyral modified copper powder;
the preparation method of the polyvinyl butyral modified copper powder comprises the following steps: according to the weight parts, 8 parts of polyvinyl butyral is dissolved in 40 parts of acetone, evenly mixed, added with 12 parts of copper powder, evenly dispersed by ultrasonic, concentrated and solidified, and crushed and ground to 150m of surface area 2 And (3) per kg, obtaining polyvinyl butyral modified copper powder.
Example 7
The difference between this example and example 5 is that in this example, the specific surface area of the polyvinyl butyral-modified copper powder is 400m 2 /kg。
Example 8
The difference between this example and example 5 is that in this example, the specific surface area of the polyvinyl butyral-modified copper powder is 300m 2 /kg。
Example 9
The difference between this example and example 5 is that in this example, the specific surface area of the polyvinyl butyral-modified copper powder is 200m 2 /kg。
Comparative example 1
The preparation method of the carbon fiber electromagnetic shielding composite material applicable to the optical cable comprises the following steps of: uniformly mixing 20 parts of carbon fiber and 10 parts of copper powder, adding 100 parts of polyethylene, 20 parts of hydrogenated styrene-butadiene-styrene copolymer, 20 parts of hydrogenated petroleum resin, 10 parts of acrylonitrile-butadiene-styrene copolymer, 10 parts of polyacrylamide, 120 parts of flame retardant, 2 parts of processing aid, 30 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene-vinyl alcohol copolymer, 30 parts of carbon fiber and 20 parts of copper powder, uniformly mixing, blending and extruding to obtain the carbon fiber electromagnetic shielding composite material;
wherein, during blending extrusion, the temperature of each zone of the extruder is as follows: the temperature of the first area is 130 ℃, the temperature of the second area is 150 ℃, the temperature of the third area is 190 ℃, and the temperature of the machine head is 170 ℃.
Comparative example 2
The present comparative example differs from example 1 only in that in step S1 of the present comparative example, polyacrylamide was not added.
Comparative example 3
The present comparative example differs from example 1 only in that in step S1 of the present comparative example, an acrylonitrile-butadiene-styrene copolymer was not added.
Comparative example 4
The comparative example differs from example 1 only in that in step S1 of the comparative example, no polyacrylic acid and acrylonitrile-butadiene-styrene copolymer were added.
Comparative example 5
The present comparative example differs from example 1 only in that no ethylene-vinyl alcohol copolymer was added in step S1 of the present comparative example.
Experimental example 1 mechanical Property test
Determination of tensile Properties of plastics according to GB/T1040.1-2018 section 1: the carbon fiber electromagnetic shielding composite materials prepared in examples 1-2 and comparative examples 1-5 were tested in general rules for tensile strength and elongation at break, wherein the experimental speed was 20mm/min. The test results are shown in table 1 below.
TABLE 1 mechanical test results
Comparison of example 1 and comparative example 1 shows that carbon fiber electromagnetic shielding composite material having a layered structure contributes to improvement of tensile strength and elongation at break thereof. Comparison of example 1 and comparative examples 2-5 shows that the addition of polyacrylamide and acrylonitrile-butadiene-styrene copolymer in the flame retardant layer and the addition of ethylene-vinyl alcohol copolymer in the electromagnetic shielding layer can improve the tensile strength and elongation at break of the carbon fiber electromagnetic shielding composite material.
Experimental example 2 flame retardant Property test
Combustion behaviour measured according to GB/T2406.2-2009 "oxygen index for plastics", part 2: the room temperature test shows that the oxygen index of the carbon fiber electromagnetic shielding composite material prepared in the examples 1-2 and the comparative examples 1-2 is tested, wherein the type of the sample is I, and the ignition method is A. The test results are shown in table 2 below.
TABLE 2 flame retardant Property test results
Comparison of example 1 and comparative example 1 shows that carbon fiber electromagnetic shielding composite material having a layered structure contributes to an improvement in oxygen index thereof. Comparison of example 1 and comparative example 2 shows that the addition of polyacrylamide in the flame retardant layer is beneficial to improving the oxygen index of the carbon fiber electromagnetic shielding composite material and enhancing the flame retardant property.
Experimental example 3 electromagnetic Shielding Performance test
The shielding effectiveness of the carbon fiber electromagnetic shielding composite materials prepared in examples 1-9 and comparative example 1 was tested according to GB/T30142-2013 method for measuring shielding effectiveness of planar electromagnetic shielding materials, wherein the frequency was 1000MHz. The test results are shown in table 3 below.
TABLE 3 electromagnetic shielding property test results
Comparison of example 1 and comparative example 1 shows that carbon fiber electromagnetic shielding composite material having a layered structure contributes to improvement of electromagnetic shielding performance thereof.
Comparison of example 2 and examples 3-9 shows that the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material can be further enhanced by carrying out surface modification on copper powder by polyvinyl butyral. Comparison of examples 5 to 6 and examples 3 to 4The method shows that when the mass ratio of the polyvinyl butyral to the copper powder is 1:4-2:3, the electromagnetic shielding capability of the carbon fiber electromagnetic shielding composite material is further enhanced. Comparison of examples 8-9 with examples 5 and 7 shows that when the specific surface area of the polyvinyl butyral modified copper powder is 200-300 m 2 And when the carbon fiber electromagnetic shielding composite material is used for carrying out the preparation, the shielding effectiveness of the carbon fiber electromagnetic shielding composite material is further improved, and the electromagnetic shielding capacity of the carbon fiber electromagnetic shielding composite material is enhanced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. The carbon fiber electromagnetic shielding composite material is characterized by comprising a flame retardant layer and an electromagnetic shielding layer which are sequentially arranged from outside to inside;
the flame-retardant layer comprises the following raw materials in parts by weight: 40-60 parts of polyethylene, 20-30 parts of hydrogenated styrene-butadiene-styrene copolymer, 20-30 parts of hydrogenated petroleum resin, 10-20 parts of acrylonitrile-butadiene-styrene copolymer, 10-20 parts of polyacrylamide, 120-140 parts of flame retardant and 2-4 parts of processing aid;
the electromagnetic shielding layer comprises the following raw materials in parts by weight: 30-60 parts of polyethylene, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of ethylene-vinyl alcohol copolymer, 20-30 parts of carbon fiber and 10-20 parts of copper powder.
2. The carbon fiber electromagnetic shielding composite material applicable to the optical cable according to claim 1, wherein the copper powder is polyvinyl butyral modified copper powder, and the preparation method of the polyvinyl butyral modified copper powder is as follows: and dissolving polyvinyl butyral in acetone, uniformly mixing, adding copper powder, uniformly dispersing, concentrating, solidifying, crushing and grinding to obtain the polyvinyl butyral modified copper powder.
3. The carbon fiber electromagnetic shielding composite material applicable to the optical cable according to claim 2, wherein the mass ratio of the polyvinyl butyral to the copper powder is 1:4-2:3.
4. The carbon fiber electromagnetic shielding composite material applicable to optical cables according to claim 2, wherein the specific surface area of the polyvinyl butyral modified copper powder is 200-300 m 2 /kg。
5. The carbon fiber electromagnetic shielding composite material applicable to the optical cable according to claim 1, wherein the flame retardant is formed by mixing aluminum hydroxide, magnesium hydroxide, zinc borate, ammonium polyphosphate and melamine cyanurate in a mass ratio of 80:10:5:3:2.
6. The carbon fiber electromagnetic shielding composite material applicable to the optical cable according to claim 1, wherein the processing aid is formed by mixing polyethylene wax, silicone master batch, antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1:1:1.
7. A method for preparing the carbon fiber electromagnetic shielding composite material applicable to the optical cable according to any one of claims 1 to 6, which is characterized by comprising the following steps:
s1, granulating: uniformly mixing the raw materials of the flame-retardant layer, carrying out banburying, first extrusion and first granulation to obtain flame-retardant layer particles, uniformly mixing the raw materials of the electromagnetic shielding layer, and carrying out second extrusion and second granulation to obtain the electromagnetic shielding layer particles;
s2, preparing a carbon fiber electromagnetic shielding composite material: and taking the flame-retardant layer particles as an outer layer material and the electromagnetic shielding layer particles as an inner layer material, and performing double-layer co-extrusion to obtain the carbon fiber electromagnetic shielding composite material.
8. The method for preparing a carbon fiber electromagnetic shielding composite material applicable to an optical cable according to claim 7, wherein in the step S1, the extrusion temperature is 100-150 ℃ during the first extrusion;
and in the second extrusion, the extrusion temperature is 130-190 ℃.
9. The method for preparing the carbon fiber electromagnetic shielding composite material applicable to the optical cable according to claim 7, wherein in the step S2, the extrusion temperature of the flame-retardant layer is 120-170 ℃ during double-layer coextrusion;
the extrusion temperature of the electromagnetic shielding layer is 140-180 ℃.
10. The carbon fiber electromagnetic shielding composite material applicable to the optical cable according to any one of claims 1-6 or the application of the carbon fiber electromagnetic shielding composite material obtained by the preparation method according to any one of claims 7-9 in the optical cable.
CN202410010532.7A 2024-01-04 2024-01-04 Carbon fiber electromagnetic shielding composite material applicable to optical cable Active CN117511045B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8918859D0 (en) * 1989-08-18 1989-09-27 Pilkington Plc Electromagnetic shielding panel
CN103333400A (en) * 2013-05-29 2013-10-02 安徽荣玖光纤通信科技有限公司 PTC polymer conductive material adopting linear low-density polyethylene as main material and preparation method thereof
CN106479031A (en) * 2016-11-03 2017-03-08 金福英 A kind of electromagnetic shielding compound package material and preparation method thereof
CN110253996A (en) * 2019-05-22 2019-09-20 东莞华尔泰装饰材料有限公司 A kind of aluminium-plastic panel of fire protection flame retarding and preparation method thereof
CN112248567A (en) * 2020-09-12 2021-01-22 杭州科能新材料科技有限公司 Composite film for cable wrapping layer and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8918859D0 (en) * 1989-08-18 1989-09-27 Pilkington Plc Electromagnetic shielding panel
CN103333400A (en) * 2013-05-29 2013-10-02 安徽荣玖光纤通信科技有限公司 PTC polymer conductive material adopting linear low-density polyethylene as main material and preparation method thereof
CN106479031A (en) * 2016-11-03 2017-03-08 金福英 A kind of electromagnetic shielding compound package material and preparation method thereof
CN110253996A (en) * 2019-05-22 2019-09-20 东莞华尔泰装饰材料有限公司 A kind of aluminium-plastic panel of fire protection flame retarding and preparation method thereof
CN112248567A (en) * 2020-09-12 2021-01-22 杭州科能新材料科技有限公司 Composite film for cable wrapping layer and preparation method thereof

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