CN105199565A - Thermoset electromagnetic shielding powder coating containing carbon fiber - Google Patents
Thermoset electromagnetic shielding powder coating containing carbon fiber Download PDFInfo
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- CN105199565A CN105199565A CN201510743102.7A CN201510743102A CN105199565A CN 105199565 A CN105199565 A CN 105199565A CN 201510743102 A CN201510743102 A CN 201510743102A CN 105199565 A CN105199565 A CN 105199565A
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Abstract
The invention discloses a thermoset electromagnetic shielding powder coating containing carbon fiber. The thermoset electromagnetic shielding powder coating comprises raw materials in parts by mass as follows: 3-5 parts of carbon fiber, 0.05-2 parts of a cationic surfactant, 0.1-1 part of an anti-sedimentation dispersion agent, 0.15-1.6 parts of a curing agent, 20-60 parts of mixed resin, 1-10 parts of silver covered copper powder, 5-25 parts of nickel powder, 1-5.5 parts of a leveling agent, 1-2.5 parts of a titanate coupling agent, 20-45 parts of a mixed solvent and 0.001-0.005 parts of an antioxidant. The carbon fiber is creatively applied to the thermoset electromagnetic shielding powder coating, the use quantity of precious metal silver and other shielding metals is reduced, the condition of poor shielding effect in a low-frequency area is reduced, and the specific gravity of the coating is greatly reduced.
Description
Technical field
The invention belongs to electromagnetic screen coating technical field, be specifically related to a kind of carbon fiber thermal solidity powder electromagnetic shielding coating.
Background technology
The mankind enter the informationalized epoch, and along with the progress of science, along with the high speed development of electronics, electrical equipment industry, various commercialization and domestic electronic appliances quantity sharply increase, and radiation is all-pervasive, and electromagnetic interference is more and more serious.Electromagnetic interference has become one of etiology of current harm humans health; Between electronic apparatus, signal disturbs the key issue also becoming Product Safety reliability mutually simultaneously.
As far back as 1969, United Nations Conference on the Human Environment was just listed electromagnetic radiation among " principal pollutant causing public hazards that must control " in.With other pollutent unlike, electromagnetic radiation is noiseless, colourless, tasteless, invisible, is that a kind of energy flow pollutes, more hidden to the damage ratio of environment, and easily by people are ignored, therefore, we more will pay much attention to various interference that electromagnetic radiation causes and harm.Common hazards of electromagnetic radiation has: electromagnetic interference (ElectromagneticInterference is called for short EMI), harm, electromagnetic information leakage etc.
The microminiaturization of electronic circuit and element, integrated, lightweight and digitizing, most electric current producing electromagnetic radiation is made to be weak current, it controls the power of signal and the power of external electromagnetic wave noise is close, and therefore easily causes mechanical action to judge action, image and sound by accident and produces the problems such as smudgy; On the other hand, these electronic products itself also outwards launch the hertzian wave of different frequency, and the robot calculator that can run to neighbour and other communication, electrical equipment etc. cause interference; More seriously the communication information day by day increased the weight of, individual privacy information reveal problem.
Case material due to the electronic product used at present has used a large amount of plastics or similar macromolecular material to substitute original metal or other effective shielding material, and common high molecular materials is isolator, hertzian wave almost can not be absorbed and reflect, have no screening ability.In order to address this problem, the electromagnetic screen coating that research and development have a conductivity is coated on electronics device casing tool corresponding site, or component surface to be used for shield electromagnetic interference be a kind of effective method.
At present existing a small amount of scientific research and Lab Products are reported, can practical application to have the lower-cost industrialization product of good electrical Magnetic Shielding Effectiveness steady quality rare.
Worldwide, silver system shielding coating product is comparatively ripe, and it is expensive, and general use is difficult to bear the deficiency that great number cost brings, and there is the defect of essence in silver system product body: product easily produces precipitation after joining glue, occurring with transport phenomena, though Recent study gets along with, having no real industrialization matured product in a large number for the production of putting into practice (Zhao Bin etc., the application of super fine silver powder in electrically conducting coating, coating technology, 2000, (1): 40); Nickel system shielding coating existing market has a certain amount of sale, but not good at the low frequency range shield effectiveness lower than 30MHz, then owing to playing poor electric conductivity, its shielding efficiency is lower, but is be shielding coating leading product at present; Copper system shielding coating shielding efficiency is high, and has price advantage, and also there is not silver migration affects coating performance problem, and therefore copper system product is developed gradually and increased, but owing to becoming subject matter with the very easily oxidized unstable properties that makes.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of carbon fiber thermal solidity powder electromagnetic shielding coating.
For achieving the above object, the present invention adopts following technical scheme:
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are: carbon fiber 3-5 part, cats product 0.05-2 part, anti-settling dispersion agent 0.1-1 part, solidifying agent 0.15-1.6 part, hybrid resin 20-60 part, silver-coated copper powder 1-10 part, nickel powder 5-25 part, flow agent 1-5.5 part, titanate coupling agent 1-2.5 part, mixed solvent 20-45 part, antioxidant 0.001-0.005 part;
Described carbon fiber is PAN-based carbon fiber, length 0.01 ~ 1mm;
Described cats product is cationic polyacrylamide;
Described anti-settling dispersion agent is Xylo-Mucine;
Described solidifying agent be selected from glyoxal ethyline, 2-benzylimidazoline one or both;
Described hybrid resin is the mixture of vibrin and epoxy resin, and the mass ratio of vibrin 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;
In described silver-coated copper powder, the volumn concentration of silver is 5-30%, particle diameter 38-53 μm;
Described nickel powder particle diameter is 38-53 μm;
Described mixed solvent is the mixture of water, polyethoxye octylphenol ether, ethyl carbitol, and the mass ratio of water, polyethoxye octylphenol ether, ethyl carbitol is 1:1:1;
Described antioxidant be selected from three (2,4-di-t-butyl) phenyl-phosphite, two (2,4-di-tert-butyl-phenyl) pentaerythritol diphosphites one or both;
A preparation method for carbon fiber thermal solidity powder electromagnetic shielding coating, step comprises:
A, carbon fiber to be cut into 0.01 ~ 1mm long, then carries out discongesting, cleans, oxide treatment;
B, the silver-coated copper powder cleaned up and nickel powder are mixed after, add 1/2nd amount titanate coupling agents and the Virahol with titanate coupling agent equivalent, be uniformly mixed;
C, half amount mixed solvent, 1/4th amount flow agents to be added in the obtained compound of step B, be uniformly mixed, then add the carbon fiber and cats product that processed, mix;
D, the flow agent of the hybrid resin powder of 1/2nd amounts, 1/4th amounts, 1/2nd amount titanate coupling agents and remaining mixed solvent to be added in the obtained compound of step C, be uniformly mixed;
E, compound obtained for step D is carried out drying treatment after, carry out fine grinding and arrive more than 300 orders, sieve;
F, compound step e obtained add remaining hybrid resin powder and flow agent, then add anti-settling dispersion agent and antioxidant, put into high-speed stirring mixer stirring and make mixing of materials even, then add solidifying agent, continue to be uniformly mixed;
G, compound obtained for step F is carried out melt extruding combination treatment, extruded stock is cooled, broken, then extruded stock is carried out pulverization process to 300 orders.
In described steps A, the concrete treatment process of carbon fiber is: carbon fiber is discongested 1500 turns/min in standing paste sample fluffer, leaves standstill 20min, puts into Soxhlet extractor 1:1 ethanol/acetone solution return 24 hours, carry out surface degreasing removal of impurities process; Take out carbon fiber dries to constant weight for subsequent use at 80 DEG C; Concentrated nitric acid with 67% carries out reflux oxidation at 100 DEG C, stirs once, go through 3 hours every 10min; Take out, be washed with distilled water to pH value be dry to constant weight at 6 ~ 7,80 DEG C for subsequent use;
Silver-coated copper powder overcomes the oxidizable defect of copper powder, has conductive good, the good characteristics such as chemical stability is high, not oxidizable, price is low.Initiative of the present invention carbon fiber is used in powder thermosetting electromagnetic screen coating, decrease the consumption of noble silver and other shielded metal, improve the situation that low frequency range shield effectiveness is not good, and the proportion of coating is reduced greatly.
Owing to adopting nickel powder to replace copper-clad silver powder, and the micron order copper-clad silver powder adopted replaces nano level silver-coated copper powder conventional in existing electromagnetic screen coating, also greatly reduces raw materials cost.
Embodiment
Embodiment 1
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are: PAN-based carbon fiber 0.309 part, cationic polyacrylamide 0.54 part, Xylo-Mucine 0.2 part, hybrid resin (vibrin: epoxy resin ratio 1:1, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide vibrin, SJ3A) 52.4 parts, silver-coated copper powder (Li Hongjin Science and Technology Ltd. of Shenzhen, Li-0103) 9.6 parts, nickel powder (Beijing Xin Rongyuan Science and Technology Ltd., 300 height of eye pure nickel powders) 8.3 parts, flow agent (ModaflowPowderIII, U.S. SOLUTIA, N-(1, 3-DIMETHYLBUTYL)-N'-PHENYL-P-PHENYLENEDIAMINE) 2.4 parts, titanate coupling agent (Nanjing You Pu Chemical Co., Ltd., three iso stearate isopropyl titanates, UP-130) 1.57 parts, by water, polyethoxye octylphenol ether, the mixed solvent 37.8 parts that ethyl carbitol forms with mass ratio 1:1:1, three (2, 4-di-t-butyl) phenyl-phosphite 0.003 part.
Described PAN-based carbon fiber, length 0.5 ~ 1mm;
In described silver-coated copper powder, the volumn concentration of silver is 25%, particle diameter 38-53 μm;
Described 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 process: get PAN-based carbon fiber, cut into 0.01 ~ 1mm long, actually below length <1mm can be controlled, 1500 turns/min is discongested in standing paste sample fluffer, leave standstill 20min, put into Soxhlet extractor volume ratio 1:1 ethanol/acetone solution return 24 hours, carry out surface degreasing removal of impurities process; Take out carbon fiber dries to constant weight for subsequent use at 80 DEG C; In the stink cupboard that reflux is housed, (temperature 100 DEG C) concentrated nitric acid with 67% is oxidized, and stirs once, go through 3 hours every 10min; Take out, be washed with distilled water to pH value be dry to constant weight at 6 ~ 7,80 DEG C for subsequent use;
The pre-treatment of metal pulvis and physical mixed: (1) selectes the spherical silver-coated copper powder of 300 order-400 order, does surface cleaning processing with organic solvent-acetone in glass cylinder body, guarantee that surface is without oil pollution, in kind processes 300 order nickel powders; Then acetone solvent is evaporated clean by the two in low-temperature bake oven at 60 DEG C; Adopt V-arrangement metal-powder mixer, mix, first low speed (100 turns/min) mixes 5min, rear high speed (1000 turns/min) mixes 10 minutes, again low speed (100 turns/min) mix 5 minutes, make it mix;
Half amount mixed solvent is joined in above-mentioned metal mixed powder, add 1/4th amount flow agents, carry out being uniformly mixed 20 minutes at solid-liquid mixing and blending machine, add the carbon fiber processed again, and add cationic polyacrylamide, carry out middling speed (500 turns/min) at solid-liquid mixing and blending machine and mix 7 minutes;
Above-mentioned material carries out drying treatment 3 hours in loft drier, then carries out fine grinding 20 minutes at ultra-fine micropowder machine, arrives more than 300 orders, sieve.
Material after drying and grinding is added remaining polyester resin powder and flow agent, then after adding the anti-heavy agent of dispersion, antioxidant, puts into high-speed stirring mixing machine, rotating speed 2800 turns/min, process 4 minutes.
Adopt thermosetting powder coating(s) production line to carry out coating and melt extrude mixing manufacture, wherein master operation is: become the reverse twin screw extruder of screw thread and melt extrude combination treatment (district's temperature 90 DEG C to material obtained in previous step, two district's temperature 110 DEG C, three district's temperature: 100 DEG C; Double-screw extruder screw rotating speed is controlled by mair motor, mair motor rotating speed 3000r/min), the material extruded, through cooling, after fragmentation, enters ball mill and supper micron mill twice technique processes, and makes end product granularity reach 300 orders, for subsequent use.
Use the powder thermosetting electromagnetic screen coating of preparation to carry out shielding efficiency test, the shielding efficiency detecting coating is 88dB.
Concrete detection method is implemented according to GB/T30142-2013 " plane electromagnetic shielding material effectiveness of shielding measuring method ".
Embodiment 2
A kind of carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are: PAN-based carbon fiber 0.505 part, cationic polyacrylamide 1.65 parts, Xylo-Mucine 1.0 parts, hybrid resin (vibrin: epoxy resin ratio 7:3, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide vibrin, SJ6A) 44.4 parts, silver-coated copper powder 5.7 parts, nickel powder 11.5 parts, flow agent 2.1 parts, titanate coupling agent 1.15 parts, by water, polyethoxye octylphenol ether, the mixed solvent 19.8 parts that ethyl carbitol forms with mass ratio 1:1:1, two (2, 4-di-tert-butyl-phenyl) pentaerythritol diphosphites 0.004 part.
Described PAN-based carbon fiber, length 0.5 ~ 1mm;
In described silver-coated copper powder, the volumn concentration of silver is 15%, particle diameter 38-53 μm;
Described 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 process: get PAN-based carbon fiber, cut into 0.01 ~ 1mm long, actually below length <1mm can be controlled, 1500 turns/min is discongested in standing paste sample fluffer, leave standstill 20min, put into Soxhlet extractor volume ratio 1:1 ethanol/acetone solution return 24 hours, carry out surface degreasing removal of impurities process; Take out carbon fiber dries to constant weight for subsequent use at 80 DEG C; In the stink cupboard that reflux is housed, (temperature 100 DEG C) concentrated nitric acid with 67% is oxidized, and stirs once, go through 3 hours every 10min; Take out, be washed with distilled water to pH value be dry to constant weight at 6 ~ 7,80 DEG C for subsequent use;
The pre-treatment of metal pulvis and physical mixed: (1) selectes the spherical silver-coated copper powder of 300 order-400 order, does surface cleaning processing with organic solvent-acetone in glass cylinder body, guarantee that surface is without oil pollution, in kind processes 300 order nickel powders; Then acetone solvent is evaporated clean by the two in low-temperature bake oven at 60 DEG C; Adopt V-arrangement metal-powder mixer, mix, first low speed (100 turns/min) mixes 5min, rear high speed (1000 turns/min) mixes 10 minutes, again low speed (100 turns/min) mix 5 minutes, make it mix;
Half amount mixed solvent is joined in above-mentioned metal mixed powder, add 1/4th amount flow agents, carry out being uniformly mixed 20 minutes at solid-liquid mixing and blending machine, add the carbon fiber processed again, and add cationic polyacrylamide, carry out middling speed (500 turns/min) at solid-liquid mixing and blending machine and mix 8 minutes;
Above-mentioned material carries out drying treatment 4 hours in loft drier, then carries out fine grinding 20 minutes at ultra-fine micropowder machine, arrives more than 300 orders, sieve.
Material after drying and grinding is added remaining polyester resin powder and flow agent, then after adding the anti-heavy agent of dispersion, antioxidant, puts into high-speed stirring mixing machine, rotating speed 2800 turns/min, process 5 minutes.
Adopt thermosetting powder coating(s) production line to carry out coating and melt extrude mixing manufacture, master operation: become screw thread reverse twin screw extruder and combination treatment (district's temperature 95 DEG C is melt extruded to material obtained in previous step, two district's temperature 115 DEG C, three district's temperature: 110 DEG C; Double-screw extruder screw rotating speed is controlled by mair motor, mair motor rotating speed 2500r/min), the material extruded, through cooling, after fragmentation, enters ball mill and supper micron mill twice technique processes, and makes end product granularity reach 300 orders, for subsequent use.
The shielding efficiency 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: PAN-based carbon fiber 0.489 part, cationic polyacrylamide 2.06 parts, Xylo-Mucine 1.0 parts, hybrid resin (vibrin: epoxy resin ratio 3:2, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide vibrin, SJ5A) 60.3 parts, silver-coated copper powder 10.2 parts, nickel powder 26.5 parts, flow agent 5.1 parts, titanate coupling agent 1.97 parts, by water, polyethoxye octylphenol ether, the mixed solvent 40.1 parts that ethyl carbitol forms with mass ratio 1:1:1, two (2, 4-di-tert-butyl-phenyl) pentaerythritol diphosphites 0.004 part.
Described PAN-based carbon fiber, length 0.5 ~ 1mm;
In described silver-coated copper powder, the volumn concentration of silver is 30%, particle diameter 38-53 μm;
Described 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 process: get PAN-based carbon fiber, cut into 0.01 ~ 1mm long, actually below length <1mm can be controlled, 1500 turns/min is discongested in standing paste sample fluffer, leave standstill 20min, put into Soxhlet extractor volume ratio 1:1 ethanol/acetone solution return 24 hours, carry out surface degreasing removal of impurities process; Take out carbon fiber dries to constant weight for subsequent use at 80 DEG C; In the stink cupboard that reflux is housed, (temperature 100 DEG C) concentrated nitric acid with 67% is oxidized, and stirs once, go through 3 hours every 10min; Take out, be washed with distilled water to pH value be dry to constant weight at 6 ~ 7,80 DEG C for subsequent use;
The pre-treatment of metal pulvis and physical mixed: (1) selectes the spherical silver-coated copper powder of 300 order-400 order, does surface cleaning processing with organic solvent-acetone in glass cylinder body, guarantee that surface is without oil pollution, in kind processes 300 order nickel powders; Then acetone solvent is evaporated clean by the two in low-temperature bake oven at 60 DEG C; Adopt V-arrangement metal-powder mixer, mix, first low speed (100 turns/min) mixes 5min, rear high speed (1000 turns/min) mixes 10 minutes, again low speed (100 turns/min) mix 5 minutes, make it mix;
Half amount mixed solvent is joined in above-mentioned metal mixed powder, add 1/4th amount flow agents, carry out being uniformly mixed 20 minutes at solid-liquid mixing and blending machine, add the carbon fiber processed again, and add cationic polyacrylamide, carry out middling speed (500 turns/min) at solid-liquid mixing and blending machine and mix 9 minutes;
Above-mentioned material carries out drying treatment 5 hours in loft drier, then carries out fine grinding 20 minutes at ultra-fine micropowder machine, arrives more than 300 orders, sieve.
Material after drying and grinding is added remaining polyester resin powder and flow agent, then after adding the anti-heavy agent of dispersion, antioxidant, puts into high-speed stirring mixing machine, rotating speed 2800 turns/min, process 3 minutes.
Adopt thermosetting powder coating(s) production line to carry out coating and melt extrude mixing manufacture, master operation: become screw thread reverse twin screw extruder and combination treatment (district's temperature 100 DEG C is melt extruded to material obtained in previous step, two district's temperature 120 DEG C, three district's temperature: 115 DEG C; Double-screw extruder screw rotating speed is controlled by mair motor, mair motor rotating speed 3500r/min), the material extruded, through cooling, after fragmentation, enters ball mill and supper micron mill twice technique processes, and makes end product granularity reach 300 orders, for subsequent use.
The shielding efficiency 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: PAN-based carbon fiber 0.441 part, cationic polyacrylamide 1.02 parts, Xylo-Mucine 0.9 part, hybrid resin (vibrin: epoxy resin ratio 4:1, Anhui Shenjian New Material Co., Ltd., mixed type curable epoxide vibrin, SJ6BDT) 53.0 parts, silver-coated copper powder 6.1 parts, nickel powder 6.5 parts, flow agent 4.8 parts, titanate coupling agent 1.73 parts, by water, polyethoxye octylphenol ether, the mixed solvent 23.3 parts that ethyl carbitol forms with mass ratio 1:1:1, two (2, 4-di-tert-butyl-phenyl) pentaerythritol diphosphites 0.004 part.
Described PAN-based carbon fiber, length 0.5 ~ 1mm;
In described silver-coated copper powder, the volumn concentration of silver is 9%, particle diameter 38-53 μm;
Described 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 process: get PAN-based carbon fiber, cut into 0.01 ~ 1mm long, actually below length <1mm can be controlled, 1500 turns/min is discongested in standing paste sample fluffer, leave standstill 20min, put into Soxhlet extractor volume ratio 1:1 ethanol/acetone solution return 24 hours, carry out surface degreasing removal of impurities process; Take out carbon fiber dries to constant weight for subsequent use at 80 DEG C; In the stink cupboard that reflux is housed, (temperature 100 DEG C) concentrated nitric acid with 67% is oxidized, and stirs once, go through 3 hours every 10min; Take out, be washed with distilled water to pH value be dry to constant weight at 6 ~ 7,80 DEG C for subsequent use;
The pre-treatment of metal pulvis and physical mixed: (1) selectes the spherical silver-coated copper powder of 300 order-400 order, does surface cleaning processing with organic solvent-acetone in glass cylinder body, guarantee that surface is without oil pollution, in kind processes 300 order nickel powders; Then acetone solvent is evaporated clean by the two in low-temperature bake oven at 60 DEG C; Adopt V-arrangement metal-powder mixer, mix, first low speed (100 turns/min) mixes 5min, rear high speed (1000 turns/min) mixes 10 minutes, again low speed (100 turns/min) mix 5 minutes, make it mix;
Half amount mixed solvent is joined in above-mentioned metal mixed powder, add 1/4th amount flow agents, carry out being uniformly mixed 20 minutes at solid-liquid mixing and blending machine, add the carbon fiber processed again, and add cationic polyacrylamide, carry out middling speed (500 turns/min) at solid-liquid mixing and blending machine and mix 7 minutes;
Above-mentioned material carries out drying treatment 4 hours in loft drier, then carries out fine grinding 20 minutes at ultra-fine micropowder machine, arrives more than 300 orders, sieve.
Material after drying and grinding is added remaining polyester resin powder and flow agent, then after adding the anti-heavy agent of dispersion, antioxidant, puts into high-speed stirring mixing machine, rotating speed 2800 turns/min, process 4 minutes.
Adopt thermosetting powder coating(s) production line to carry out coating and melt extrude mixing manufacture, master operation: become screw thread reverse twin screw extruder and combination treatment (district's temperature 90 DEG C is melt extruded to material obtained in previous step, two district's temperature 110 DEG C, three district's temperature: 100 DEG C; Double-screw extruder screw rotating speed is controlled by mair motor, mair motor rotating speed 4000r/min), the material extruded, through cooling, after fragmentation, enters ball mill and supper micron mill twice technique processes, and makes end product granularity reach 300 orders, for subsequent use.
The shielding efficiency detecting coating is 89dB.
Claims (10)
1. a carbon fiber thermal solidity powder electromagnetic shielding coating, its raw material and mass parts are: carbon fiber 3-5 part, cats product 0.05-2 part, anti-settling dispersion agent 0.1-1 part, solidifying agent 0.15-1.6 part, hybrid resin 20-60 part, silver-coated copper powder 1-10 part, nickel powder 5-25 part, flow agent 1-5.5 part, titanate coupling agent 1-2.5 part, mixed solvent 20-45 part, antioxidant 0.001-0.005 part.
2. electromagnetic screen coating as claimed in claim 1, is characterized in that: described carbon fiber is PAN-based carbon fiber, length 0.01 ~ 1mm.
3. electromagnetic screen coating as claimed in claim 1, is characterized in that: described cats product is cationic polyacrylamide.
4. electromagnetic screen coating as claimed in claim 1, is characterized in that: described anti-settling dispersion agent is Xylo-Mucine.
5. electromagnetic screen coating as claimed in claim 1, is characterized in that: described solidifying agent be selected from glyoxal ethyline, 2-benzylimidazoline one or both.
6. electromagnetic screen coating as claimed in claim 1, it is characterized in that: described hybrid resin is the mixture of vibrin and epoxy resin, the mass ratio of vibrin 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.
7. electromagnetic screen coating as claimed in claim 1, is characterized in that: in described silver-coated copper powder, the volumn concentration of silver is 5-30%, and particle diameter 38-53 μm, described nickel powder particle diameter is 38-53 μm.
8. electromagnetic screen coating as claimed in claim 1, it is characterized in that: described mixed solvent is the mixture of water, polyethoxye octylphenol ether, ethyl carbitol, the mass ratio of water, polyethoxye octylphenol ether, ethyl carbitol is 1:1:1.
9. electromagnetic screen coating as claimed in claim 1, it is characterized in that: described antioxidant is selected from three (2,4-di-t-butyl) phenyl-phosphite, one or both in two (2,4-di-tert-butyl-phenyl) pentaerythritol diphosphites.
10. the electromagnetic screen coating as described in any one of claim 1-9, is characterized in that: the step preparation by the following method of described electromagnetic screen coating:
A, carbon fiber to be cut into 0.01 ~ 1mm long, then carries out discongesting, cleans, oxide treatment;
B, the silver-coated copper powder cleaned up and nickel powder are mixed after, add 1/2nd amount titanate coupling agents and the Virahol with titanate coupling agent equivalent, be uniformly mixed;
C, half amount mixed solvent, 1/4th amount flow agents to be added in the obtained compound of step B, be uniformly mixed, then add the carbon fiber and cats product that processed, mix;
D, the flow agent of the hybrid resin powder of 1/2nd amounts, 1/4th amounts, 1/2nd amount titanate coupling agents and remaining mixed solvent to be added in the obtained compound of step C, be uniformly mixed;
E, compound obtained for step D is carried out drying treatment after, carry out fine grinding and arrive more than 300 orders, sieve;
F, compound step e obtained add remaining hybrid resin powder and flow agent, then add anti-settling dispersion agent and antioxidant, put into high-speed stirring mixer stirring and make mixing of materials even, then add solidifying agent, continue to be uniformly mixed;
G, compound obtained for step F is carried out melt extruding combination treatment, extruded stock is cooled, broken, then extruded stock is carried out pulverization process to 300 orders.
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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 |
| CN107426957A (en) * | 2017-08-16 | 2017-12-01 | 苏州城邦达力材料科技有限公司 | Conducting resinl 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 |
| CN111690305A (en) * | 2020-06-24 | 2020-09-22 | 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 |
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| 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 |
| US20180303013A1 (en) * | 2017-04-13 | 2018-10-18 | Luxshare Precision Industry Co., Ltd. | Electromagnetic shielding material, a connector shielding shell and a cable |
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