Light weight high electromagnetic interference (emi) shielding material based on carbon nanotubes reinforced polymer composites 机翻标题: 暂无翻译,请尝试点击翻译按钮。

公开号/公开日
IN1793/DEL/2011 A 2012-12-28 [IN2011DE01793] / 2012-12-28
申请号/申请日
2011IN-DE01793 / 2011-06-24
发明人
PRATAP SINGH BHANU;PARVEEN GARG;SHAILAJA PANDE;BEHARI MATHUR RAKESH;PARVEEN SAINI;KUMAR DHAWAN SUNDEEP;
申请人
COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH;
主分类号
IPC分类号
A01N
摘要
(IN2011DE01793) The present invention relates to the development of light weight carbon nanotubes (CNT) reinforced polymer composites in the form of composite for electromagnetic interference (EMI) shielding applications.  The invention also provides a method for the development of such EMI shielding materials using a novel dispersion technique for higher loading of CNTs.  This technique enables up to 50 wt% of CNTs to be uniformly dispersed in the polymer.  Such high loadings result in achieving high EMI shielding effectiveness of up to 80 to 105 dB in X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz).  These composite primarily behave as EMI shielding material making them available as shielding materials for a variety of applications such as radar absorption material and for shielding of electronic equipments, medical instruments etc.  In addition to having high EMI shielding properties, these composites are strong, light weight (density in the range 1.2-1.3 g/cc), flexible and corrosion resistant.  This makes these CNT-polymer composites more advantageous than metals and other carbon-based polymer composite materials as EMI shielding materials in range 8.2-18 GHz covering X and Ku band of the electromagnetic spectra.
机翻摘要
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地址
代理人
代理机构
;
优先权号
2011IN-DE01793 2011-06-24
主权利要求
(IN2011DE01793)  1. Electromagnetic interference (EMI) shielding material comprising Carbon Nanotubes (CNT) and polymer in the ratio ranging between 5:95 to 50:50 having density in the range of 1.2 to 1.3 g/cc, flexural strength is in the range of 58-97 MPa, flexural modulus is in the range of 3224-9886 MPa and EMI shielding effectiveness (SE) value in the range of 13 to 105 dB. 2. A process for the preparation of electromagnetic interference (EMI) shielding material as claimed in claim 1, wherein said process comprising the steps of: i. dissolving 10 to 20% (w/v) polymer in solvent to obtain a solution;  ii. dispersing 0.2 to 0.3 %(w/v) CNT in solvent or in the solution as obtained in step (i) by ultrasonication followed by magnetic stirring for period in the range of 22 to 26 h followed by filtering to obtain a film of dispersed CNTs or resin-impregnated dispersed CNTs respectively;  iii. impregnating film of dispersed CNTs as obtained in step (ii) with solution as obtained in step (i) to obtain resin-impregnated dispersed CNTs;  iv. drying the resin-impregnated dispersed CNTs as obtained in step (ii) and (iii) at temperature in the range of 40 to 70.deg.C followed by cutting to obtain resin impregnated strips;  v. stacking resin impregnated strips as obtained in step (iv) at temperature in the range of 70 to 100.deg.C and a pressure in the range of 10 to 100 kg/cm2;  vi. curing the stacked layers as obtained in step (v) at temperature in the range of 140 to 160.deg.C for period in the range of 2 to 4hr to obtain light weight CNT-reinforced polymer composite as electromagnetic interference (EMI) shielding material. 3. A process as claimed in step (i) of claim 2, wherein the polymer are selected from thermoplastic resin or thermosetting resin. 4. A process as claimed in claim 3, wherein the thermoplastic resin are selected from the group consisting of polystyrene, polycarbonate, polyurethane, acrylics, polymethyl methacrylate, polyvinylchloride. 5. A process as claimed in claim 3, wherein the thermosetting resin are selected from the group consisting of epoxy resins, phenol-formaldehyde resins or polyesters. 6. A process as claimed in step (i) and step (ii) of claim 2, wherein the solvent are selected from the group consisting of toluene, acetone, chloroform, N-methyl pyrrolidone or ethanol or combination thereof. 7. A process as claimed in step (ii) of claim 2, wherein the CNTs are selected from multi-walled carbon nanotubes (MWCNT), single-walled carbon nanotubes (SWCNTs) or combination thereof. 8. A process as claimed in step (ii) of claim 2, wherein CNTs are selected from CVD (Chemical Vapor Deposition) based, arc discharged based or HiPCo (High Pressure Carbon Monoxide) based CNTs. preferably CVD based. 9. A process as claimed in claim 2, wherein CNTs obtained in step (ii) and step (iii) is in the form of a bucky paper. 10. A process as claimed in step (ii) of claim 3, wherein filtration is carried out using filtration unit comprises top coupler, filter paper, metallic sieve, bottom coupler, rubber cork, vacuum port and conical vacuum flask.
法律状态
(IN2011DE01793) LEGAL DETAILS FOR IN1793/DEL/2011  Actual or expected expiration date=2031-06-24    Legal state=ALIVE    Status=PENDING     Event publication date=2011-06-24  Event code=IN/APP  Event indicator=Pos  Event type=Examination events  Application details  Application country=IN IN1793/DEL/2011  Application date=2011-06-24  Standardized application number=2011IN-DE01793     Event publication date=2012-12-28  Event code=IN/A  Event indicator=Pos  Event type=Examination events  Application laid open  Publication country=IN  Publication number=IN1793/DEL/2011  Publication stage Code=A  Publication date=2012-12-28  Standardized publication number=IN2011DE01793
专利类型码
A
国别省市代码
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