CN102329560A - Novel electromagnetic shielding paint for surface of silicone rubber - Google Patents
Novel electromagnetic shielding paint for surface of silicone rubber Download PDFInfo
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- CN102329560A CN102329560A CN201010225939XA CN201010225939A CN102329560A CN 102329560 A CN102329560 A CN 102329560A CN 201010225939X A CN201010225939X A CN 201010225939XA CN 201010225939 A CN201010225939 A CN 201010225939A CN 102329560 A CN102329560 A CN 102329560A
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- electromagnetic shielding
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- shielding coating
- silastic surface
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Abstract
The invention relates to an electromagnetic shielding paint for the surface of a silicone rubber and a preparation method thereof. The electromagnetic shielding paint for the surface of the silicone rubber comprises a solute part and a solvent part, and the solute part comprises the following components: 15-27% of a film forming resin, 1-6% of a curing agent, 40-65% of a conductive filler, 0.2-0.6% of a coupling agent, 0.2-0.6% of an anti-settling agent, and 0.5-6% of a catalyst. The electromagnetic shielding paint of the invention has a very excellent adhesion effect on the surface of the silicone rubber, so the preparative conductive silicone rubber has a good electromagnetic shielding performance.
Description
Technical field:
The present invention relates to the electromagnetic screen coating field, and being specifically related to a kind of is that sticker is fit to the novel electromagnetic shielding coating that silastic surface is used through adding the conductive filler material preparation with the modified organic silicone resin.
Background technology:
In recent years; High speed development along with science and technology and electronic industry; The electronic and electrical equipment of various digitizings, high frequencyization when work to space radiation the hertzian wave of a large amount of different wave lengths and frequency; Thereby cause new environmental pollution-Electromagnetic Interference (Electromagnetic Interference, EMI) with the radiation frequency interferences (Radio-Frequency Interference, RFI); Have serious consequences to family, commercial affairs especially military affairs, become one of social effects of pollution of paying close attention to countries in the world.
One of effective measure that EMI is shielded are to be prone to reveal electromagnetic place at the casing seam portion of electron device and hole place with the conductive shield material it is closed, and present stage adopts conductive rubber material to carry out electromagnetic shielding mostly.At present, the conductive rubber material great majority are to be prepared from through conductive doped filler, and this method shortcoming one is that material cost is higher, in order to obtain conductivity preferably, need to add a large amount of conductive filler materials usually; Secondly, adding a large amount of conductive filler materials often causes the hardness of material to raise flexibility decrease, thereby the sealing effectiveness variation of material.Therefore; Study a kind of novel electromagnetic screen coating; Method through at silastic surface spraying electromagnetic screen coating prepares conductive rubber, compares with the conventional conductive elastomeric material, and this material not only can reduce cost significantly; Do not influence simultaneously the sealing property of conductive rubber, have very wide application prospect.
Summary of the invention
The object of the present invention is to provide a kind of novel electromagnetic shielding coating that is applicable to silastic surface and preparation method thereof; Mostly the technical problem underlying that it will solve is hard to existing electromagnetic shielding gasket; Be applied to cabinet and cause problems such as edge warping and distortion easily, thereby a kind of electromagnetic screen coating that silastic surface uses that is suitable for is provided; The electromagnetic screen coating for preparing is coated on silastic surface obtains a kind of electromagnetic shielding sealing material, the cost of this material is lower, and conductive effect is better, and the thickness of coating is 50 μ m usually, promptly can reach advantages of favorable electromagnetic shielding effect; On the other hand, do not influence the elasticity and the compression set tolerance of Zylox behind the coating electromagnetic screen coating.The preparation method of coating is that to adopt a kind of modified organic silicone resin be sticker, through adding proper curing agents, catalyzer and conductive filler material, thereby obtains a kind of elastic sealing gasket of surface-coated conductive coating.
For solving the problems of the technologies described above, the present invention adopts following technical proposals, and a kind of silastic surface is used novel electromagnetic shielding coating, it is characterized in that the weight percentage of each component is:
Film-forming resin 15%-27%
Solidifying agent 1%-6%
Conductive filler material 30%-65%
Coupling agent 0.2%-0.6%
Anti-settling agent 0.2%-0.6%
Catalyzer 0.5%-6%
Other auxiliary agents 0.2%-5%
Described film-forming resin is at least a in silicone resin and the polyurethane-modified silicone resin.
At least a for in isocyanate curing agent, acyloxy silane, ketoximinosilanes, organoalkoxysilane and the hydrogen-containing siloxane of said solidifying agent.
Said conductive filler material is at least a in silver powder, silver-coated copper powder, nickel powder, electrically conductive graphite, graphitized carbon black, the conductive carbon fibres peacekeeping carbon nanotube.
Described coupling agent is at least a in titanate coupling agent or the silane coupling agent.
Described anti-settling agent is at least a in aerosil, organobentonite, the polyamide wax.
Described catalyzer is at least a in tin compound, titanium compound and the platinic compound.
A kind of method for preparing above-mentioned silastic surface with electromagnetic screen coating, said method flow may further comprise the steps:
(1) prepares burden according to each composition weight percentage composition of above-mentioned solute part;
(2) preparation of coupling agent solution
The proportioning of coupling agent and solvent is 6.3%～18%: 82%～93.7%, and coupling agent is selected a kind of in titanic acid ester or the silane coupling agent for use; Solvent is selected at least a in YLENE, Virahol, propyl carbinol, ETHYLE ACETATE, the butylacetate for use.
(3) preparation of anti-settling agent solution
The proportioning of anti-settling agent and solvent is 4.2%～16%: 84%～95.8%; Anti-settling agent is selected at least a in gaseous oxidation silicon and the polyamide wax for use; Solvent is selected at least a in YLENE, Virahol, propyl carbinol, ETHYLE ACETATE, the butylacetate for use.
(4) the surperficial coupling processing of conductive filler material
At normal temperatures conductive filler material is added in the solution that contains coupling agent, is uniformly dispersed, conductive filler material is mixed with coupling agent fully.
(5) preparation curing agent solution
Preparation is carried out at normal temperatures, stirs, and the proportioning of solidifying agent and solvent is 45.2%～56%, and solvent is selected at least a in YLENE, Virahol, propyl carbinol, ETHYLE ACETATE, the butylacetate for use.
(6) coating major portion preparation
Film-forming resin, conductive filler material, coupling agent, anti-settling agent solution, catalyzer and other auxiliary agents are mixed; Fully disperse; Add solvent adjustment viscosity at last between 40～60s; Promptly process the coating major portion, solvent is selected at least a in YLENE, Virahol, propyl carbinol, ETHYLE ACETATE, the butylacetate for use.
(7) preparation of coating
In use, the coating major portion is mixed with curing agent solution, promptly make electromagnetic screen coating, can construct after leaving standstill for some time according to the ratio of prescription.Can spray or blade coating, before the construction, guarantee that silastic surface is clean, no-sundries, coating at high temperature solidifies, and solidification value is 100 ℃～200 ℃, and set time is adjustable.
Embodiment:
Below in conjunction with examples of implementation the present invention is made further detailed description.
Embodiment 1
The technical process and the processing parameter of present embodiment are following:
Batching
Film-forming resin 23.7%
Solidifying agent 2.4%
Conductive filler material 39.4%
Coupling agent 0.4%
Anti-settling agent 0.4%
Catalyzer 0.2%
Solvent 33.5%
1. described film-forming resin is polyurethane-modified silicone resin, and solidifying agent is isocyanic ester, silane containing hydrogen and acyloxy silane.
2. the preparation of anti-settling agent solution
Anti-settling agent is selected polyamide wax for use, and solvent is a YLENE, and the proportioning of polyamide wax and YLENE is 5%: 95%, at normal temperatures both is mixed, and fully stirs to get final product.
3. the preparation of coupling agent solution
Coupling agent is selected titanate coupling agent for use, and solvent is selected the mixed solvent of propyl carbinol and YLENE for use, and the proportioning of coupling agent and solvent is 6.5%: 93.5%.At normal temperatures both are mixed, fully stirring gets final product.
4. the surperficial coupling processing of conductive filler material
Conductive filler material is selected silver powder for use, silver powder is added to contains in the titanate coupling agent solution at normal temperatures, is uniformly dispersed, and conductive filler material is fully combined with coupling agent.
5. preparation curing agent solution
With isocyanic ester and the dilution of silane containing hydrogen solidifying agent, the proportioning of solidifying agent and solvent is 45.2%～56% at normal temperatures, and solvent is selected the mixing solutions of YLENE and propyl carbinol for use, and YLENE and propyl carbinol ratio are 5: 1
6. coating major portion preparation
The preparation of coating major portion is carried out at normal temperatures; With polyurethane-modified silicone resin, silver powder, polyamide wax solution, titanate coupling agent solution and catalyst mix; Fully disperse, the mixed solvent that adds propyl carbinol and YLENE is at last regulated viscosity, promptly processes the coating major portion.
7. the preparation of electromagnetic screen coating
Ratio according to prescription is mixed the coating major portion with curing agent solution; Promptly make electromagnetic screen coating; Leave standstill the back and adopt blade coating or spraying coating process; Above-mentioned electromagnetic screen coating evenly is coated in silastic surface, places 5min at the indoor 30min of leaving standstill or in 50 ℃～100 ℃ baking oven; The Zylox that will be coated with conductive coating is again put into 100 ℃～200 ℃ baking ovens, solidifies 2～10min, promptly obtains conductive silicon rubber, then it is carried out performance test.Sticking power test :≤1 grade; The capability of electromagnetic shielding test: in 1MHz～1000MHz scope, when coat-thickness was 50 μ m, electromagnet shield effect can reach 70～110dB; Conducting performance test: 1.4 * 10
-2Ω .cm.
Embodiment 2
The technical process and the processing parameter of present embodiment are following:
Batching
Film-forming resin 21.5%
Solidifying agent 2.4%
Conductive filler material 39.4%
Coupling agent 0.4%
Anti-settling agent 0.4%
Catalyzer 2.4%
Solvent 33.5%
1. described film-forming resin is a silicone resin, and solidifying agent is organoalkoxysilane and silane containing hydrogen.
2. the preparation of anti-settling agent solution
Anti-settling agent is selected polyamide wax for use, and solvent is a YLENE, and the proportioning of polyamide wax and YLENE is 5%: 95%, at normal temperatures both is mixed, and fully stirs to get final product.
3. the preparation of coupling agent solution
Coupling agent is selected titanate coupling agent for use, and solvent is selected the mixed solvent of propyl carbinol and YLENE for use, and the proportioning of coupling agent and solvent is 6.5%: 93.5%.At normal temperatures both are mixed, fully stirring gets final product.
4. the surperficial coupling processing of conductive filler material
Conductive filler material is selected silver powder for use, silver powder is added to contains in the titanate coupling agent solution at normal temperatures, is uniformly dispersed, and conductive filler material is fully combined with coupling agent.
5. preparation curing agent solution
With organoalkoxysilane and the dilution of silane containing hydrogen solidifying agent, the proportioning of solidifying agent and solvent is 45.2%～56% at normal temperatures, and solvent is selected the mixing solutions of YLENE and propyl carbinol for use, and YLENE and propyl carbinol ratio are 5: 1
6. coating major portion preparation
The preparation of coating major portion is carried out at normal temperatures; With silicone resin, silver powder, polyamide wax solution, titanate coupling agent solution and catalyst mix; Fully disperse, the mixed solvent that adds propyl carbinol and YLENE is at last regulated viscosity, promptly processes the coating major portion.
7. the preparation of electromagnetic screen coating
Ratio according to prescription is mixed the coating major portion with curing agent solution; Promptly make electromagnetic screen coating; Leave standstill the back and adopt blade coating or spraying coating process; Above-mentioned electromagnetic screen coating evenly is coated in silastic surface, places 5min at the indoor 30min of leaving standstill or in 50 ℃～100 ℃ baking oven; The Zylox that will be coated with conductive coating is again put into 100 ℃～200 ℃ baking ovens, solidifies 2～10min, promptly obtains conductive silicon rubber, then it is carried out performance test.The sticking power test is for≤2 grades; In 1MHz～1000MHz scope, electromagnet shield effect can reach 70～110dB when coat-thickness is 50 μ m; Conducting performance test is 0.8 * 10
-2Ω .cm.
Claims (8)
1. a novel electromagnetic shielding coating that is used for silastic surface comprises solute part and solvent part, it is characterized in that the weight percentage of said each component of solute part is:
Film-forming resin 15%-27%
Solidifying agent 1%-6%
Conductive filler material 40%-65%
Coupling agent 0.2%-0.6%
Anti-settling agent 0.2%-0.6%
Catalyzer 0.5%-6%
Other auxiliary agents 0.2%-5%
2. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described film-forming resin is at least a in silicone resin and the polyurethane-modified silicone resin.
3. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described solidifying agent is at least a in isocyanate curing agent, acyloxy silane, ketoximinosilanes, organoalkoxysilane and the hydrogen-containing siloxane.
4. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described conductive filler material selects at least a in silver powder, silver-coated copper powder, nickel powder, electrically conductive graphite, graphitized carbon black, the conductive carbon fibres peacekeeping carbon nanotube for use.
5. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described coupling agent is at least a in titanate coupling agent or the silane coupling agent.
6. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described anti-settling agent is at least a in aerosil, organobentonite, the polyamide wax.
7. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described catalyzer is at least a in tin compound, titanium compound and the platinic compound.
8. silastic surface according to claim 1 is used novel electromagnetic shielding coating, it is characterized in that described other auxiliary agents are silicone antifoam agent and organosilicon flow agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010225939XA CN102329560A (en) | 2010-07-14 | 2010-07-14 | Novel electromagnetic shielding paint for surface of silicone rubber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010225939XA CN102329560A (en) | 2010-07-14 | 2010-07-14 | Novel electromagnetic shielding paint for surface of silicone rubber |
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| CN109082124A (en) * | 2018-07-16 | 2018-12-25 | 国网江西省电力有限公司电力科学研究院 | The preparation method of photocuring electromagnetic shielding composite material based on multi-arm carbon nano-tube |
| CN109875551A (en) * | 2019-02-27 | 2019-06-14 | 中山优感科技有限公司 | Small flexible dry-type electrode of a kind of contact impedance and preparation method thereof |
| CN109851827A (en) * | 2019-03-07 | 2019-06-07 | 常州大学 | A kind of preparation method of highly conductive flexible gas sensitive |
| CN109851827B (en) * | 2019-03-07 | 2021-09-28 | 常州大学 | Preparation method of high-conductivity flexible gas-sensitive material |
| CN110551422A (en) * | 2019-10-16 | 2019-12-10 | 苏州高泰电子技术股份有限公司 | Conductive ink, SMT (surface mount technology) conductive elastomer and preparation method thereof |
| CN110551422B (en) * | 2019-10-16 | 2022-04-12 | 苏州高泰电子技术股份有限公司 | Conductive ink, SMT (surface mount technology) conductive elastomer and preparation method thereof |
| CN110713783A (en) * | 2019-11-11 | 2020-01-21 | 成都普瑞斯特新材料有限公司 | Nano low-frequency electromagnetic shielding coating and preparation method thereof |
| CN112961389A (en) * | 2021-02-07 | 2021-06-15 | 中晟嘉特材料科技(西安)有限公司 | Flexible sleeve for electromagnetic shielding and preparation method thereof |
| CN113214719A (en) * | 2021-04-07 | 2021-08-06 | 北京中科纳通电子技术有限公司 | Conductive paste and preparation method thereof, conductive rubber containing conductive paste and preparation method thereof |
| CN115304998A (en) * | 2022-08-09 | 2022-11-08 | 国网江西省电力有限公司电力科学研究院 | Fan blade anti-icing coating with electromagnetic shielding function and preparation method thereof |
| CN116159726A (en) * | 2022-10-11 | 2023-05-26 | 常州市北达机械制造有限公司 | Novel serial welding method for welding strip and battery piece |
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Application publication date: 20120125 |