CN105199565B - A kind of carbon fiber thermal solidity powder electromagnetic shielding coating - Google Patents
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating Download PDFInfo
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Abstract
The present invention discloses a kind of carbon fiber thermal solidity powder electromagnetic shielding coating, and its raw material and mass parts are：35 parts of carbon fiber, 0.05 2 parts of cationic surfactant, anti-settling 0.1 1 parts of dispersant, 0.15 1.6 parts of curing agent, 20 60 parts of hybrid resin, 1 10 parts of silver-coated copper powder, 5 25 parts of nickel powder, 1 5.5 parts of levelling agent, 1 2.5 parts of titanate coupling agent, 20 45 parts of mixed solvent, 0.001 0.005 parts of antioxidant.Of the invention initiative is used for carbon fiber in powder thermosetting electromagnetic screen coating, reduces the dosage of noble silver and other shielding metals, improves the bad situation of low frequency range shield effectiveness, and the proportion of coating is substantially reduced.
Description
Technical field
The invention belongs to electromagnetic screen coating technical field, and in particular to a kind of carbon fiber thermal solidity powder electromagnetic shielding applies
Material.
Background technology
The mankind enter the information-based epoch, various with electronics, the high speed development of electrical equipment industry with the progress of science
Commercial and domestic electronic appliances quantity sharply increases, and radiation is all-pervasive, and electromagnetic interference is increasingly severe.Electromagnetic interference is
As one of etiology for endangering human health now；Signal mutual interference is also reliable as Product Safety between electronic apparatus simultaneously
The key issue of property.
Early in 1969, electromagnetic radiation was just included in the " master for causing public hazards that must be controlled by UNCHE
Want pollutant " among.Unlike other pollutants, electromagnetic radiation is noiseless, colourless, tasteless, invisible, is that a kind of energy stream is dirty
Dye, it is more hidden to the damage ratio of environment, easily ignored by people, therefore, caused by we will more pay much attention to electromagnetic radiation
Various interference and harm.Common hazards of electromagnetic radiation has：Electromagnetic interference (Electromagnetic Interference, letter
Claim EMI), human body harm, electromagnetic information leakage etc..
Being miniaturized, be integrated of electronic circuit and element, lightweight and digitlization so that majority produces the electricity of electromagnetic radiation
Flow and be close for weak current, the power of the power and external electromagnetic wave noise of its control signal, therefore easily cause machinery and move
Make erroneous judgement action, image and sound and produce the problems such as smudgy；On the other hand, these electronic products are also outwards launched not in itself
The electromagnetic wave of same frequency, the electronic computer and other communications, electric equipment that can be run to neighbour etc. interferes；It is more tight
The problem of weight is that the communication information that increasingly aggravates, individual privacy information reveal problem.
Because the case material of the electronic product used at present has used substantial amounts of plastic products or similar macromolecule material
Material substitutes original metal or other effective shielding materials, and common high molecular materials are insulator, can hardly to electromagnetic wave
Absorb and reflect, have no screening ability.In order to solve this problem, the electromagnetic screen coating for researching and developing conductive energy applies
Electronics device casing tool corresponding site is spread on, or it is a kind of effective method that component surface, which is used for shielding electromagnetic interference,.
Existing a small amount of scientific research at present reports with Lab Products, can practical application there is good effectiveness
The lower-cost industrialization product of steady quality is rare.
Worldwide, silver system shielding coating product is more ripe, and its is expensive, and general service is difficult to bear great number
The deficiency that cost is brought, and the defects of essence be present in silver system product body：Product easily produces precipitation after matching somebody with somebody glue, with migration
What phenomenon occurred, though Recent study gets along with, have no that really industrialization matured product is largely used to production practices (Zhao Bin
Deng, application of the super fine silver powder in electrically-conducting paint, coating technology, 2000, (1)：40)；Nickel system shielding coating existing market has one
Quantitative sale, but it is bad in the low frequency range shield effectiveness less than 30MHz then poor due to playing electric conductivity, and its shield effectiveness is relatively low,
But it is at present shielding coating leading products to be；Copper system shielding coating shield effectiveness is high, and has price advantage, and silver migration is also not present
Influence coating performance problem, therefore copper system product gradually exploitation increase, but due to easily be oxidized cause performance it is unstable into
For subject matter.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of shielding of carbon fiber thermal solidity powder electromagnetic to apply
Material.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Carbon fiber 3-5 parts, cation
Surfactant 0.05-2 parts, anti-settling dispersant 0.1-1 parts, curing agent 0.15-1.6 parts, hybrid resin 20-60 parts, silver-colored copper-clad
Powder 1-10 parts, nickel powder 5-25 parts, levelling agent 1-5.5 parts, titanate coupling agent 1-2.5 parts, mixed solvent 20-45 parts are anti-oxidant
Agent 0.001-0.005 parts；
The carbon fiber is polyacrylonitrile-based carbon fibre, 0.01~1mm of length；
The cationic surfactant is PAMC；
The anti-settling dispersant is sodium carboxymethylcellulose；
The curing agent is selected from one or both of 2-methylimidazole, 2- benzylimidazolines；
The hybrid resin is the mixture of polyester resin and epoxy resin, and the mass ratio of polyester resin and epoxy resin is
1:1-4:1, preferred polyester resin:The mass ratio of epoxy resin is 1:1,7:3,3:2,4:1；
Silver-colored volumn concentration is 5-30% in the silver-coated copper powder, 38-53 μm of particle diameter；
The nickel powder particle diameter is 38-53 μm；
The mixed solvent is water, polyethoxy octylphenol ether, the mixture of ethyl carbitol, water, polyethoxy octyl group
Phenolic ether, the mass ratio of ethyl carbitol are 1：1：1；
The antioxidant is selected from three (2,4- di-t-butyls) phenyl-phosphites, double (2,4- di-tert-butyl-phenyls) Ji Wusi
One or both of alcohol diphosphites；
A kind of preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating, step include：
A, carbon fiber is cut into 0.01~1mm length, is then discongested, cleaned, oxidation processes；
B, by the silver-coated copper powder cleaned up and nickel powder it is well mixed after, add half amount titanate coupling agent and
With the isopropanol of titanate coupling agent equivalent, it is uniformly mixed；
C, half amount mixed solvent, a quarter amount levelling agent are added in compound made from step B, are stirred mixed
Close, add treated carbon fiber and cationic surfactant, be well mixed；
D, the hybrid resin powder of half amount, the levelling agent of a quarter amount, half amount titanate esters are coupled
Agent and remaining mixed solvent are added in compound made from step C, are stirred mixing；
E, after compound made from step D being dried into processing, carry out fine gtinding and reach more than 300 mesh, sieving；
F, compound made from step E is added into remaining hybrid resin powder and levelling agent, adds anti-settling dispersant
And antioxidant, it is put into high-speed stirring mixer stirring and make it that material is well mixed, and then adds curing agent, continues stirring and mix
Close uniform；
G, compound made from step F is subjected to melting extrusion mixed processing, extruded stock is cooled down, crushed, then will squeezed
Discharging carries out pulverization process to 300 mesh.
The specific processing method of carbon fiber is in the step A：Carbon fiber is discongested in standing paste sample fluffer 1500 turns/
Min, 20min is stood, is put into Soxhlet extractor with 1:1 ethanol/acetone solution flows back 24 hours, and progress surface degreasing, which removes, lives together
Reason；It is standby that taking-up carbon fiber is dried to constant weight at 80 DEG C；Reflux oxidation is carried out at 100 DEG C with 67% concentrated nitric acid, every
10min was stirred once, after 3 hours；Take out, it is standby to be dried to constant weight at 6~7,80 DEG C to be washed with distilled water to pH value；
Silver-coated copper powder overcomes the defects of copper powder is oxidizable, have it is conductive it is good, chemical stability is high, it is not oxidizable,
The good characteristics such as price is low.Of the invention initiative is used for carbon fiber in powder thermosetting electromagnetic screen coating, reduces expensive
The dosage of argent and other shielding metals, improves the bad situation of low frequency range shield effectiveness, and cause the proportion of coating significantly
Reduce.
Due to replacing copper-clad silver powder, and the micron order copper-clad silver powder used to replace existing electromagnetic screen coating using nickel powder
In commonly use nanoscale silver-coated copper powder, be greatly reduced cost of material.
Embodiment
Embodiment 1
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Polyacrylonitrile-based carbon fibre
0.309 part, 0.54 part of PAMC, 0.2 part of sodium carboxymethylcellulose, hybrid resin (polyester resin：Epoxy resin
Ratio 1:1, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide polyester resin, SJ3A) 52.4 parts, silver-colored copper-clad
9.6 parts of powder (Li Hongjin Science and Technology Ltd.s of Shenzhen, Li-0103), nickel powder (Beijing Xin Rongyuan Science and Technology Ltd.s, 300 heights of eye
Pure nickel powder) 8.3 parts, levelling agent (Modaflow Powder III, U.S. SOLUTIA, N- (1,3-DIMETHYLBUTYL)-N'-
PHENYL-P-PHENYLENEDIAMINE) 2.4 parts, titanate coupling agent (Nanjing You Pu Chemical Co., Ltd.s, three iso stearates
Isopropyl titanate, UP-130) 1.57 parts, by water, polyethoxy octylphenol ether, ethyl carbitol with mass ratio 1：1：1 composition
37.8 parts of mixed solvent, three 0.003 part of (2,4- di-t-butyl) phenyl-phosphites.
The polyacrylonitrile-based carbon fibre, 0.5~1mm of length；
Silver-colored volumn concentration is 25% in the silver-coated copper powder, 38-53 μm of particle diameter；
The nickel powder particle diameter is 38-53 μm；
The preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating is as follows：
Carbon fiber processing：Polyacrylonitrile-based carbon fibre is taken, 0.01~1mm length is cut into, can actually control length<1mm
Hereinafter, 1500 turns/min is discongested in standing paste sample fluffer, 20min is stood, is put into Soxhlet extractor and uses volume ratio 1:1 second
Alcohol/acetone soln flows back 24 hours, carries out surface degreasing removal of impurities processing；It is standby that taking-up carbon fiber is dried to constant weight at 80 DEG C；
(100 DEG C of temperature) is aoxidized with 67% concentrated nitric acid in the fume hood equipped with reflux, every 10min stirrings once,
After 3 hours；Take out, it is standby to be dried to constant weight at 6~7,80 DEG C to be washed with distilled water to pH value；
Metal pulvis pre-processes and physical mixed：(1) the spherical silver-coated copper powder of the mesh of 300 mesh -400 is selected, with organic solvent third
Ketone does surface cleaning processing in glass jar body, it is ensured that surface in kind handles 300 mesh nickel powders without oil pollution；Then
The two is evaporated acetone solvent totally at 60 DEG C in low temperature baking oven；Using V-arrangement metal dust batch mixer, mixed, first
(100 turns/min) mixing 5min of low speed, (1000 turns/min) of rear high speed mix 10 minutes, (100 turns/min) of low speed mixes 5 points again
Clock, make it well mixed；
Half amount mixed solvent is added in above-mentioned metal mixed powder, a quarter amount levelling agent is added, in solid-liquid
Mixing and blending machine is stirred mixing 20 minutes, adds treated carbon fiber, and adds PAMC, solid
Liquid mixing and blending machine carries out (500 turns/min) of middling speed and mixed 7 minutes；
Processing 3 hours is dried in above-mentioned material in drying box, and then carrying out fine gtinding 20 in super fine machine divides
Clock, reach more than 300 mesh, sieving.
Material after drying and grinding is added into remaining polyester resin powder and levelling agent, scattered anti-heavy agent is added, resists
After oxidant, high-speed stirred mixer is put into, 2800 turns/min of rotating speed, is handled 4 minutes.
Coating melting extrusion mixing manufacture is carried out using thermosetting powder coating production line, wherein master operation is：Become spiral shell
Line reverse double screw extruder obtained material in previous step is carried out melting extrusion mixed processing (90 DEG C of area's temperature, two
110 DEG C of area's temperature, three area's temperature：100℃；Double-screw extruder screw rotating speed is controlled by main motor, main motor rotating speed 3000r/
Min), the material of extrusion through cooling down, it is broken after, handled into ball mill and micronizer twice technique so that terminal
Product granularity reaches 300 mesh, standby.
Shield effectiveness experiment is carried out using the powder thermosetting electromagnetic screen coating of preparation, the shield effectiveness for detecting coating is
88dB。
Specific detection method is according to GB/T 30142-2013《Plane electromagnetic shielding material shield effectiveness measuring method》It is real
Apply.
Embodiment 2
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Polyacrylonitrile-based carbon fibre
0.505 part, 1.65 parts of PAMC, 1.0 parts of sodium carboxymethylcellulose, hybrid resin (polyester resin：Epoxy resin
Ratio 7:3, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide polyester resin, SJ6A) 44.4 parts, silver-colored copper-clad
5.7 parts of powder, 11.5 parts of nickel powder, 2.1 parts of levelling agent, 1.15 parts of titanate coupling agent, by water, polyethoxy octylphenol ether, ethyl
Carbitol is with mass ratio 1：1：19.8 parts of the mixed solvent of 1 composition, double (2,4- di-tert-butyl-phenyl) pentaerythrite diphosphorous acids
0.004 part of ester.
The polyacrylonitrile-based carbon fibre, 0.5~1mm of length；
Silver-colored volumn concentration is 15% in the silver-coated copper powder, 38-53 μm of particle diameter；
The nickel powder particle diameter is 38-53 μm；
The preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating is as follows：
Carbon fiber processing：Polyacrylonitrile-based carbon fibre is taken, 0.01~1mm length is cut into, can actually control length<1mm
Hereinafter, 1500 turns/min is discongested in standing paste sample fluffer, 20min is stood, is put into Soxhlet extractor and uses volume ratio 1:1 second
Alcohol/acetone soln flows back 24 hours, carries out surface degreasing removal of impurities processing；It is standby that taking-up carbon fiber is dried to constant weight at 80 DEG C；
(100 DEG C of temperature) is aoxidized with 67% concentrated nitric acid in the fume hood equipped with reflux, every 10min stirrings once,
After 3 hours；Take out, it is standby to be dried to constant weight at 6~7,80 DEG C to be washed with distilled water to pH value；
Metal pulvis pre-processes and physical mixed：(1) the spherical silver-coated copper powder of the mesh of 300 mesh -400 is selected, with organic solvent third
Ketone does surface cleaning processing in glass jar body, it is ensured that surface in kind handles 300 mesh nickel powders without oil pollution；Then
The two is evaporated acetone solvent totally at 60 DEG C in low temperature baking oven；Using V-arrangement metal dust batch mixer, mixed, first
(100 turns/min) mixing 5min of low speed, (1000 turns/min) of rear high speed mix 10 minutes, (100 turns/min) of low speed mixes 5 points again
Clock, make it well mixed；
Half amount mixed solvent is added in above-mentioned metal mixed powder, a quarter amount levelling agent is added, in solid-liquid
Mixing and blending machine is stirred mixing 20 minutes, adds treated carbon fiber, and adds PAMC, solid
Liquid mixing and blending machine carries out (500 turns/min) of middling speed and mixed 8 minutes；
Processing 4 hours is dried in above-mentioned material in drying box, and then carrying out fine gtinding 20 in super fine machine divides
Clock, reach more than 300 mesh, sieving.
Material after drying and grinding is added into remaining polyester resin powder and levelling agent, scattered anti-heavy agent is added, resists
After oxidant, high-speed stirred mixer is put into, 2800 turns/min of rotating speed, is handled 5 minutes.
Coating melting extrusion mixing manufacture, master operation are carried out using thermosetting powder coating production line：It is reverse to become screw thread
Double screw extruder carries out melting extrusion mixed processing (95 DEG C of area's temperature, two area's temperature to obtained material in previous step
115 DEG C, three area's temperature：110℃；Double-screw extruder screw rotating speed is controlled by main motor, main motor rotating speed 2500r/min), squeeze
The material gone out through cooling down, it is broken after, handled into ball mill and micronizer twice technique so that end product granularity
Reach 300 mesh, it is standby.
The shield effectiveness for detecting coating is 91.8dB.
Embodiment 3
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Polyacrylonitrile-based carbon fibre
0.489 part, 2.06 parts of PAMC, 1.0 parts of sodium carboxymethylcellulose, hybrid resin (polyester resin：Epoxy resin
Ratio 3:2, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide polyester resin, SJ5A) 60.3 parts, silver-colored copper-clad
10.2 parts of powder, 26.5 parts of nickel powder, 5.1 parts of levelling agent, 1.97 parts of titanate coupling agent, by water, polyethoxy octylphenol ether, ethyl
Carbitol is with mass ratio 1：1：40.1 parts of the mixed solvent of 1 composition, double (2,4- di-tert-butyl-phenyl) pentaerythrite diphosphorous acids
0.004 part of ester.
The polyacrylonitrile-based carbon fibre, 0.5~1mm of length；
Silver-colored volumn concentration is 30% in the silver-coated copper powder, 38-53 μm of particle diameter；
The nickel powder particle diameter is 38-53 μm；
The preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating is as follows：
Carbon fiber processing：Polyacrylonitrile-based carbon fibre is taken, 0.01~1mm length is cut into, can actually control length<1mm
Hereinafter, 1500 turns/min is discongested in standing paste sample fluffer, 20min is stood, is put into Soxhlet extractor and uses volume ratio 1:1 second
Alcohol/acetone soln flows back 24 hours, carries out surface degreasing removal of impurities processing；It is standby that taking-up carbon fiber is dried to constant weight at 80 DEG C；
(100 DEG C of temperature) is aoxidized with 67% concentrated nitric acid in the fume hood equipped with reflux, every 10min stirrings once,
After 3 hours；Take out, it is standby to be dried to constant weight at 6~7,80 DEG C to be washed with distilled water to pH value；
Metal pulvis pre-processes and physical mixed：(1) the spherical silver-coated copper powder of the mesh of 300 mesh -400 is selected, with organic solvent third
Ketone does surface cleaning processing in glass jar body, it is ensured that surface in kind handles 300 mesh nickel powders without oil pollution；Then
The two is evaporated acetone solvent totally at 60 DEG C in low temperature baking oven；Using V-arrangement metal dust batch mixer, mixed, first
(100 turns/min) mixing 5min of low speed, (1000 turns/min) of rear high speed mix 10 minutes, (100 turns/min) of low speed mixes 5 points again
Clock, make it well mixed；
Half amount mixed solvent is added in above-mentioned metal mixed powder, a quarter amount levelling agent is added, in solid-liquid
Mixing and blending machine is stirred mixing 20 minutes, adds treated carbon fiber, and adds PAMC, solid
Liquid mixing and blending machine carries out (500 turns/min) of middling speed and mixed 9 minutes；
Processing 5 hours is dried in above-mentioned material in drying box, and then carrying out fine gtinding 20 in super fine machine divides
Clock, reach more than 300 mesh, sieving.
Material after drying and grinding is added into remaining polyester resin powder and levelling agent, scattered anti-heavy agent is added, resists
After oxidant, high-speed stirred mixer is put into, 2800 turns/min of rotating speed, is handled 3 minutes.
Coating melting extrusion mixing manufacture, master operation are carried out using thermosetting powder coating production line：It is reverse to become screw thread
Double screw extruder carries out melting extrusion mixed processing (100 DEG C of area's temperature, two area's temperature to obtained material in previous step
120 DEG C, three area's temperature：115℃；Double-screw extruder screw rotating speed is controlled by main motor, main motor rotating speed 3500r/min), squeeze
The material gone out through cooling down, it is broken after, handled into ball mill and micronizer twice technique so that end product granularity
Reach 300 mesh, it is standby.
The shield effectiveness for detecting coating is 90.0dB.
Embodiment 4
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Polyacrylonitrile-based carbon fibre
0.441 part, 1.02 parts of PAMC, 0.9 part of sodium carboxymethylcellulose, hybrid resin (polyester resin：Epoxy resin
Ratio 4:1, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide polyester resin, SJ6BDT) 53.0 parts, silver bag
6.1 parts of copper powder, 6.5 parts of nickel powder, 4.8 parts of levelling agent, 1.73 parts of titanate coupling agent, by water, polyethoxy octylphenol ether, ethyl
Carbitol is with mass ratio 1：1：23.3 parts of the mixed solvent of 1 composition, double (2,4- di-tert-butyl-phenyl) pentaerythrite diphosphorous acids
0.004 part of ester.
The polyacrylonitrile-based carbon fibre, 0.5~1mm of length；
Silver-colored volumn concentration is 9% in the silver-coated copper powder, 38-53 μm of particle diameter；
The nickel powder particle diameter is 38-53 μm；
The preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating is as follows：
Carbon fiber processing：Polyacrylonitrile-based carbon fibre is taken, 0.01~1mm length is cut into, can actually control length<1mm
Hereinafter, 1500 turns/min is discongested in standing paste sample fluffer, 20min is stood, is put into Soxhlet extractor and uses volume ratio 1:1 second
Alcohol/acetone soln flows back 24 hours, carries out surface degreasing removal of impurities processing；It is standby that taking-up carbon fiber is dried to constant weight at 80 DEG C；
(100 DEG C of temperature) is aoxidized with 67% concentrated nitric acid in the fume hood equipped with reflux, every 10min stirrings once,
After 3 hours；Take out, it is standby to be dried to constant weight at 6~7,80 DEG C to be washed with distilled water to pH value；
Metal pulvis pre-processes and physical mixed：(1) the spherical silver-coated copper powder of the mesh of 300 mesh -400 is selected, with organic solvent third
Ketone does surface cleaning processing in glass jar body, it is ensured that surface in kind handles 300 mesh nickel powders without oil pollution；Then
The two is evaporated acetone solvent totally at 60 DEG C in low temperature baking oven；Using V-arrangement metal dust batch mixer, mixed, first
(100 turns/min) mixing 5min of low speed, (1000 turns/min) of rear high speed mix 10 minutes, (100 turns/min) of low speed mixes 5 points again
Clock, make it well mixed；
Half amount mixed solvent is added in above-mentioned metal mixed powder, a quarter amount levelling agent is added, in solid-liquid
Mixing and blending machine is stirred mixing 20 minutes, adds treated carbon fiber, and adds PAMC, solid
Liquid mixing and blending machine carries out (500 turns/min) of middling speed and mixed 7 minutes；
Processing 4 hours is dried in above-mentioned material in drying box, and then carrying out fine gtinding 20 in super fine machine divides
Clock, reach more than 300 mesh, sieving.
Material after drying and grinding is added into remaining polyester resin powder and levelling agent, scattered anti-heavy agent is added, resists
After oxidant, high-speed stirred mixer is put into, 2800 turns/min of rotating speed, is handled 4 minutes.
Coating melting extrusion mixing manufacture, master operation are carried out using thermosetting powder coating production line：It is reverse to become screw thread
Double screw extruder carries out melting extrusion mixed processing (90 DEG C of area's temperature, two area's temperature to obtained material in previous step
110 DEG C, three area's temperature：100℃；Double-screw extruder screw rotating speed is controlled by main motor, main motor rotating speed 4000r/min), squeeze
The material gone out through cooling down, it is broken after, handled into ball mill and micronizer twice technique so that end product granularity
Reach 300 mesh, it is standby.
The shield effectiveness for detecting coating is 89dB.
Claims (8)
1. a kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are：Carbon fiber 3-5 parts, cation form
Face activating agent 0.05-2 parts, anti-settling dispersant 0.1-1 parts, curing agent 0.15-1.6 parts, hybrid resin 20-60 parts, silver-coated copper powder
1-10 parts, nickel powder 5-25 parts, levelling agent 1-5.5 parts, titanate coupling agent 1-2.5 parts, mixed solvent 20-45 parts, antioxidant
0.001-0.005 parts；
The carbon fiber is polyacrylonitrile-based carbon fibre, 0.01~1mm of length；
The cationic surfactant is PAMC.
2. electromagnetic screen coating as claimed in claim 1, it is characterised in that：The anti-settling dispersant is carboxymethyl cellulose
Sodium.
3. electromagnetic screen coating as claimed in claim 1, it is characterised in that：The curing agent is selected from 2-methylimidazole, 2- benzene
One or both of base imidazoline.
4. electromagnetic screen coating as claimed in claim 1, it is characterised in that：The hybrid resin is polyester resin and asphalt mixtures modified by epoxy resin
The mass ratio of the mixture of fat, polyester resin and epoxy resin is 1:1-4:1.
5. electromagnetic screen coating as claimed in claim 1, it is characterised in that：Silver-colored volumn concentration in the silver-coated copper powder
For 5-30%, 38-53 μm of particle diameter, the nickel powder particle diameter is 38-53 μm.
6. electromagnetic screen coating as claimed in claim 1, it is characterised in that：The mixed solvent is water, polyethoxy octyl group
The mixture of phenolic ether, ethyl carbitol, water, polyethoxy octylphenol ether, the mass ratio of ethyl carbitol are 1：1：1.
7. electromagnetic screen coating as claimed in claim 1, it is characterised in that：The antioxidant is selected from three (bis- tertiary fourths of 2,4-
Base) phenyl-phosphite, one or both of double (2,4- di-tert-butyl-phenyls) pentaerythritol diphosphites.
8. the electromagnetic screen coating as described in claim any one of 1-7, it is characterised in that：The electromagnetic screen coating by with
It is prepared by lower method and step：
A, carbon fiber is cut into 0.01~1mm length, is then discongested, cleaned, oxidation processes；
B, after being well mixed the silver-coated copper powder cleaned up and nickel powder, half amount titanate coupling agent and and titanium are added
The isopropanol of acid esters coupling agent equivalent, is uniformly mixed；
C, half amount mixed solvent, a quarter amount levelling agent are added in compound made from step B, are stirred mixing,
Treated carbon fiber and cationic surfactant are added, is well mixed；
D, by the hybrid resin of half amount, the levelling agent of a quarter amount, half amount titanate coupling agent and surplus
Under mixed solvent add in compound made from step C, be stirred mixing；
E, after compound made from step D being dried into processing, carry out fine gtinding and reach more than 300 mesh, sieving；
F, compound made from step E is added into remaining hybrid resin and levelling agent, adds anti-settling dispersant and anti-oxidant
Agent, stirring is put into high-speed stirring mixer so that material is well mixed, curing agent is then added, continues to be uniformly mixed；
G, compound made from step F is subjected to melting extrusion mixed processing, extruded stock is cooled down, crushed, then by extruded stock
Pulverization process is carried out to 300 mesh.
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| CN106543809A (en) * | 2016-10-08 | 2017-03-29 | 江苏大使同丰涂料有限公司 | A kind of special fibre coating and preparation method thereof |
| CN106936031A (en) * | 2017-04-13 | 2017-07-07 | 东莞讯滔电子有限公司 | Electromagnetic shielding material, shielding shell for connector and cable |
| CN107426957B (en) * | 2017-08-16 | 2020-08-28 | 苏州城邦达益材料科技有限公司 | Conductive adhesive film layer, preparation method and electromagnetic shielding film |
| CN111138956A (en) * | 2019-12-23 | 2020-05-12 | 江阴市玲珑高分子材料有限公司 | Thermosetting powder electromagnetic shielding coating |
| CN111417295A (en) * | 2020-03-06 | 2020-07-14 | 南昌欧菲生物识别技术有限公司 | Conductive foam, ultrasonic fingerprint module, display screen assembly and electronic equipment |
| CN111690305B (en) * | 2020-06-24 | 2022-02-22 | 京准化工技术(上海)有限公司 | Electromagnetic shielding flame-retardant material for carbon fiber substrate and preparation method and application thereof |
| CN115449218B (en) * | 2022-07-25 | 2023-07-21 | 成都飞机工业（集团）有限责任公司 | Wave-absorbing film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1099446C (en) * | 1997-05-26 | 2003-01-22 | 四川联合大学 | Electromagnetic wave shielding coating, and method for preparing same |
| JP4002638B2 (en) * | 1997-09-03 | 2007-11-07 | インターメタリックス株式会社 | Film forming method using powder coating material |
| CN102329560A (en) * | 2010-07-14 | 2012-01-25 | 中化化工科学技术研究总院 | Novel electromagnetic shielding paint for surface of silicone rubber |
| CN102408813B (en) * | 2011-09-28 | 2013-04-17 | 国润恒科（天津）防腐工程技术有限公司 | High-electric-conductivity heavy-anticorrosion wave-absorbing powder paint |
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