CN102427711B - Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof - Google Patents
Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof Download PDFInfo
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- CN102427711B CN102427711B CN201110288286.4A CN201110288286A CN102427711B CN 102427711 B CN102427711 B CN 102427711B CN 201110288286 A CN201110288286 A CN 201110288286A CN 102427711 B CN102427711 B CN 102427711B
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Abstract
The invention relates to an electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tows and preparation thereof. The electromagnetic shielding sheet comprises at least one layer of electromagnetic shielding sheet and is characterized by further comprising a high-polymer foamed sheet, wherein a plurality of carbon fiber endless tows of a flexural wave state penetrate in the high-polymer foamed sheet, and a plurality of unbent carbon fiber endless tows are embedded in the single side or double sides of the high-polymer foamed sheet. According to the invention, a special arrangement manner of the carbon fiber endless tows is adopted and can make up for the defect of poor effect on shielding certain frequency bands by the carbon fiber endless tows of the flexural wave state and the unbent carbon fiber endless tows, so that a broadband electromagnetic shielding effect is achieved, and besides, the integral electromagnetic shielding effectiveness can be increased.
Description
Technical field
The present invention relates to carbon fiber filament bundle flexing electromagnetic shielding sheet and the preparation thereof compound with stretching arrangement, belong to electromagnetic shielding material technical field.
Background technology
Along with appearance and the application of high-tech product, its electromagnetic radiation pollution producing is the fourth-largest environmental pollution after water pollution, air pollution and noise pollution.Electromagnetic radiation meeting affects people's physiological habit and health, and long term exposure, in electromagnetic radiation environment, also can cause nervous system, cardiovascular system, internal system, reproductive system, immune damage.For reducing the harm of electromagnetic radiation to human body, people should take the protection to electromagenetic wave radiation.
Dress protection is the most effectively protection.As the fabric of electromagnetic shielding, be generally to inweave or blending is weaved so that the conductive fibers such as metal are wired.Though carbon fiber has conductivity, because of its fragility, be mixed into net or directly mix high polymer and make mainly with staple in bulk.As the one that the CN 1544723A 2003 of patent Gao Jianzhong invents is inhaled ripple composite nano-fiber material textile composition, polyacrylonitrile-based carbon with 80%～96% and 4%～20% nanometer silicon carbide, adding assistant is made polyacrylonitrile-based carbon fibre through certain operation, manufacture blend fabric with it, and effects on surface Nickel Plating Treatment, make it have the fabric of the electromagnetic shielding of high wave-absorbing effect.The multilayer materials of the US 014,862,6A1 2002 of patent Kazuhlto Matsumura, 0.3%～3% diameter that is mixed with that its unique distinction is to comprise in composite material a laminar structure is that 8 μ m length are that the carbon fiber non-woven (similar carbon felt) of 40mm metallic fiber adopts iron, aluminium, copper or their alloy as inhaling ripple layer and bottom metal layers, material at 9.5GHz place to be up to-46dB of electromagnetic decay.The CN 1730555A 2005 of patent Shi Chunsheng by the short activated carbon fiber filled composite materials of 5～50mm of 0.5%～3%, its at 8GHz place to be up to-14dB of electromagnetic decay.Utilize the different laminated mode of material also to reach specific wave-absorbing effect, as 2,009 one kinds of frequency selection surface wave-absorbing materials of CN 101444979A of patent bright red etc. and preparation method thereof, utilize Multilayer Absorbing Material Coating complex technique, adopt the preparation that realizes wide-band and wave-absorbing coating at middle lay " ten " font of layer glass fiber aluminium foil, the effective suction wave number in 2～8GHz reaches 16 dB.But in these patents, all improve its absorbing property with composition variation or content increase, and be the random mixing lapping method shaping of carbon short fiber.The principle, the preparation method that improve the electromagnet shield effect of material with the arrangement of carbon fiber filament bundle and composite construction from the present invention are all different.
Summary of the invention
The object of this invention is to provide a kind of electromagnetic shielding sheet and preparation method thereof, described electromagnetic shielding sheet can in conjunction with carbon fiber filament bundle flexing arrange and stretch arrangement advantage, and make up the two not good enough shortcoming of shield effectiveness in some frequency range, obtain the effectiveness of wideband, and electromagnet shield effect on the whole increases.
In order to achieve the above object, the invention provides a kind of electromagnetic shielding sheet, comprise at least one deck electromagnetic shielding sheet, it is characterized in that, described electromagnetic shielding sheet comprises base material, the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching.
Preferably, the described carbon fiber filament bundle existing with flexural wave form is interspersed in base material, and the described carbon fiber filament bundle stretching is embedded in the single or double of base material.
More preferably, the described carbon fiber filament bundle existing with flexural wave form is arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the bearing of trend of multiple carbon fiber filament bundles that exist with flexural wave form, spacing equates, described orthogonal arrangement is that multiple carbon fiber filament bundles that exist with flexural wave form are divided into two groups, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in every group is parallel to each other, spacing equates, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in two groups is mutually vertical, described oblique is arranged as multiple carbon fiber filament bundles that exist with flexural wave form and is divided into two groups, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in every group is parallel to each other, spacing equates, the angle of the bearing of trend of the carbon fiber filament bundle existing taking flexural wave form in two groups is acute angle.
More preferably, the described carbon fiber filament bundle stretching is arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for multiple carbon fiber filament bundles that stretch, spacing equates, described orthogonal arrangement is that multiple carbon fiber filament bundles that stretch are divided into two groups, the carbon fiber filament bundle stretching in every group is parallel to each other, spacing equates, the carbon fiber filament bundle stretching in two groups is mutually vertical, described oblique is arranged as multiple carbon fiber filament bundles that stretch and is divided into two groups, the carbon fiber filament bundle stretching in every group is parallel to each other, spacing equates, the angle of the carbon fiber filament bundle stretching in two groups is acute angle.
More preferably, the bearing of trend of the described carbon fiber filament bundle existing taking flexural wave form is identical with the bearing of trend of the carbon fiber filament bundle stretching, vertical or angle is acute angle mutually.
Preferably, between described electromagnetic shielding sheet, adopt in the face of back to together laminated, align laminated face-to-face or rotate laminated mode and be combined with each other.
Preferably, described base material is high polymer foamed sheet, is preferably polystyrene (PS) foamed sheet, polypropylene (PP) foamed sheet or polyvinyl chloride (PVC) foamed sheet.
Preferably, described at least one deck electromagnetic shielding sheet is done as a whole, and its upside and downside are provided with sealing film, and described sealing film is high-polymer membrane, fabric or high polymer foamed sheet, pastes sealing by binding agent.Sealing film shields.
The present invention also provides the preparation method of above-mentioned electromagnetic shielding sheet, it is characterized in that, comprise: on base material, arrange the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching, obtain single or multiple electromagnetic shielding sheets, multiple electromagnetic shielding sheets are combined with each other, obtain electromagnetic shielding sheet.
Compared with prior art, the invention has the beneficial effects as follows:
1, adopted special carbon fiber filament bundle arrangement mode, it can make up the two not good enough shortcoming of shield effectiveness in some frequency range, obtains the effectiveness of wideband, and electromagnet shield effect on the whole increases.
2, materials are few, and method for making is easy, can be directly used in the preparation of large area sheet material;
3, of many uses, can be used as the lining material of protective garment and the interior trim barrier material of light structure building materials and the vehicles of electromagnetic shielding.
Brief description of the drawings
Fig. 1 a is that the parallel flexing in the same way of one side is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 1 b is that one side parallel orthogonal flexing is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 1 c is that the parallel flexing of one side square net is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 1 d is that the orthogonal flexing of one side network is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 a is that two-sided parallel orthogonal in the same way flexing is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 b is that the parallel flexing of two-sided square net is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 c is that the parallel flexing of two-sided network is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 d is that the parallel flexing of two-sided parallel orthogonal is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 e is that the orthogonal flexing of 90 ° of networks of Double-side rotary is arranged electromagnetic shielding chip architecture schematic diagram;
Fig. 2 f is that 45 ° of square nets of two-sided different rotations are arranged electromagnetic shielding chip architecture schematic diagram with parallel parallel flexing;
Fig. 3 a is that 4 aspects are arranged composite electromagnetic screen chip architecture schematic diagram to the parallel flexing of back of the body square net;
Fig. 3 b is that parallel flexing arrangement composite electromagnetic screen chip architecture schematic diagram is stretched on 4 aspect opposites.
Fig. 3 c is that arrange with in the face of the parallel flexing of the compound one side square net of the back of the body on 3 aspect opposites and 45 ° of orthogonal flexings of two-sided square net of rotation are arranged laminated electromagnetic shielding chip architecture schematic diagram;
Fig. 3 d is that stage construction stretches parallel oblique flexing arrangement composite electromagnetic screen chip architecture schematic diagram to the back of the body;
Fig. 4 is electromagnet shield effect-frequency test curve of the electromagnetic shielding sheet shown in Fig. 1 c;
Fig. 5 is electromagnet shield effect-frequency test curve that the different rhombuses of single-layer double-side and square net and orthogonal flexing are arranged compound electromagnetic shielding sheet;
Fig. 6 is electromagnet shield effect-frequency test curve of the electromagnetic shielding sheet shown in Fig. 3 b.
Embodiment
A kind of electromagnetic shielding sheet, comprises at least one deck electromagnetic shielding sheet, and described electromagnetic shielding sheet comprises base material, the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching.Described high polymer foamed sheet plays a supportive role.Its preparation method is specially:
(1) prepare preparatory stage of electromagnetic shielding sheet: one, carbon filament bundle will be twisted through pre-, or carries out impregnation or scrape slurry baking and curing, or after the processing of both carrying out, obtaining cross section is circular, constitutionally stable carbon filament bundle, uses to make and arrange paving; Its two, high polymer foamed sheet can be selected foamed polystyrene sheet, polypropylene expanded or foam polyvinyl chloride sheet.
(2) what carbon filament bundle flexing was arranged makes step: be by carbon filament bundle with flexural wave form along the in-plane of foamed sheet by bundle, sew up in high polymer foamed sheet equally spacedly, or rotating behind 90o or q angle and a wrong position, in mode similarly by carbon filament bundle with flexural wave form along the in-plane of this foamed sheet by bundle, sew up in this foamed sheet equally spacedly, making flexing waveform is not that synchronous peak-to-peak overlaps mutually, but peak valley is relative, obtain parallel, orthogonal or oblique flexing arrangement composite sheet.Preferentially that parallel or orthogonal flexing is arranged composite sheet; Preferentially, on different directions, the spacing of flexing arrangement carbon filament interfascicular is consistent.Described flexing waveform is similar to sine wave, and wavelength is needle gage; Interfascicular is apart from the distance that is the carbon filament interfascicular that adopts.Needle gage: interfascicular distance is (1 ~ 20): (10 ~ 1), needle gage: interfascicular is apart from being preferentially 2:1 or 4:1, and half-wavelength (λ/2) is that a grid square or quarter-wave (λ/4) are a grid square.Flexural wave form will keep uniformity on high polymer foamed sheet, therefore tension force when carbon fiber bundle is back and forth interted with form one on the other will remain unchanged as far as possible, penetrates angle and will meet sinusoidal wave inclination angle.
(3) the parallel preparation of stretching arrangement of composite carbon endless tow: be to arrange in composite sheet in described flexing, by carbon filament Shu Yiyi determining deviation, relatively flexing orientation in the same way or orthogonally parallel be laid on the one side of this composite sheet, be pressed into again the top layer of high polymer foamed sheet with pressure cylinder, obtain the composite sheet that one side is parallel to or is orthogonal to flexing arrangement.If do not do the row paving of orthogonal square formula or oblique diamond type, or do not do laminatedly, what in the mode of gluing or pad pasting, parallel paving is pressed into stretches carbon filament Shu Jinhang sealing, obtains the in the same way parallel or parallel orthogonal flexing of mono-layer single-face and arranges electromagnetic shielding sheet.
(4) the orthogonal or rhombus of composite carbon endless tow stretches the preparation of arrangement: be carbon filament Shu Yiyi determining deviation, parallel orthogonal or the overlapping row of parallel oblique are layered on the one side of the composite sheet of process (3) gained, first repeat (3) process but do not do sealing, this sheet is horizontally rotated behind 90o or q angle, tile described carbon filament bundle on this face with a determining deviation, be pressed into again the top layer of high polymer foamed sheet with pressure cylinder, square net or the network of arrangement stretched in formation, obtains the composite sheet that one side square net or network flexing are arranged.If do not do laminated, in the mode of gluing or pad pasting to forming the carbon filament Shu Jinhang sealing of grid, obtain mono-layer single-face square net or network flexing and arrange electromagnetic shielding sheet.Fig. 1 a is that the parallel flexing in the same way of one side is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 1 b is that one side parallel orthogonal flexing is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 1 c is that the parallel flexing of one side square net is arranged electromagnetic shielding chip architecture schematic diagram, and Fig. 1 d is that the orthogonal flexing of one side network is arranged electromagnetic shielding chip architecture schematic diagram.
(5) two-sided carbon filament bundle flexing is arranged the preparation compound with stretching arrangement: by the one side composite sheet upset back side of gained in process (3) or process (4) upwards, with in the same way or horizontally rotate arbitrarily angled after, repetitive process (3) or process (4) repeat to be arranged in parallel, in orthogonal arrangement or oblique arrangement, any one row spreads process of press in, obtain two-sided in the same way parallel, parallel orthogonal, square net or network flexing are arranged the two-sided same compound sheet of (being that two sides is identical), or two-sided for described four kinds stretch arrange combination of two (being two sides difference) two-sided different composite sheet.Wherein, be preferentially two-sided same compound sheet; Preferentially horizontally rotate is to rotate 90o or 45o.If do not do laminated, in the mode of gluing or pad pasting to forming the carbon filament Shu Jinhang sealing of second, obtain the identical or two-sided different flexing of single-layer double-side and arrange electromagnetic shielding sheet.Fig. 2 a is that two-sided parallel orthogonal in the same way flexing is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 2 b is that the parallel flexing of two-sided square net is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 2 c is that the parallel flexing of two-sided network is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 2 d is that the parallel flexing of two-sided parallel orthogonal is arranged electromagnetic shielding chip architecture schematic diagram, Fig. 2 e is that the orthogonal flexing of 90 ° of networks of Double-side rotary is arranged electromagnetic shielding chip architecture schematic diagram, and Fig. 2 f is that 45 ° of square nets of two-sided different rotations are arranged electromagnetic shielding chip architecture schematic diagram with parallel parallel flexing.
(6) preparation of MULTILAYER COMPOSITE electromagnetic shielding sheet: at least get the one in the composite sheet being made by process (3), process (4), process (5), or the composite sheet of process (2) adds the one in the composite sheet that process (3), process (4), process (5) make, carry out two classes laminated: a class is close or align face-to-face laminated in the face of backing layer; One class is that rotation is laminated.
A. close or face-to-face laminated mode in the face of backing layer: described refer to that in the face of backing layer closes got individual layer composite sheet is in the bonding mode in the front of a slice and the back side of another sheet.Described face-to-face laminatedly refer to that got individual layer composite sheet is with vis-a-vis between two, or the relative bonding mode in the back side between two, Fig. 3 a is that 4 aspects are arranged composite electromagnetic screen chip architecture schematic diagram to the parallel flexing of back of the body square net, and Fig. 3 b is that parallel flexing arrangement composite electromagnetic screen chip architecture schematic diagram is stretched on 4 aspect opposites; Fig. 3 d is that stage construction stretches parallel oblique flexing arrangement composite electromagnetic screen chip architecture schematic diagram to the back of the body.
B. rotate laminated mode: described rotation is laminated refers to bonding in the same way or after rotating of every individual layer composite sheet relative to adjacent layer.Described rotation can be arbitrarily angled, but composite sheet to parallel and orthogonal class is preferentially to rotate 90 ° or 45 °; To the composite sheet of rhombus class, self is laminated, is preferentially to rotate 90 ° or 45 °; Laminated with the composite sheet of parallel and orthogonal class, be preferentially the 1/2(b/2 that rotates the acute angle b of this rhombus) or rotate b/2+90 °.Fig. 3 c is that arrange with in the face of the parallel flexing of the compound one side square net of the back of the body on 3 aspect opposites and 45 ° of orthogonal flexings of two-sided square net of rotation are arranged laminated electromagnetic shielding chip architecture schematic diagram.
Illustrate the present invention below in conjunction with embodiment.
embodiment 1-4: mono-layer single-face electromagnetic shielding sheet and preparation thereof and capability of electromagnetic shielding thereof:
Raw materials used is commercially available polyacrylonitrile (PAN) base carbon fibre endless tow, 200tex/3000F; PVC foamed sheet, silicon rubber.
Carbon fiber filament bundle flexing is arranged composite sheet preparation: the PVC foamed sheet of purchase is cut into and is of a size of 30cm ' 30cm specification, get certain needle gage and be
λ; Interfascicular distance; For half-wavelength or 1/4 wavelength,
d=
λ/ 2 or
λ/ 4mm.Adopt special steel wire pin, to shuttle back and forth to and fro one on the other, form flexural wave form with carbon fiber filament bundle in PVC foamed sheet, until all carbon fiber filament bundles have been worn, make the composite sheet that parallel flexing is arranged.Or again this sheet is rotated after 90o, and a wrong ground in the same way by carbon fiber filament bundle with flexural wave form along the in-plane of this foamed sheet by bundle, sew up in this foamed sheet or in localized area equally spacedly the composite sheet that orthogonal flexing is arranged.
Get interfascicular apart from being 5mm, needle gage is
λ=4
dcomposite sheet a slice that the parallel flexing of=20mm is arranged is carried out the orthogonal laying of stretching of carbon fiber filament bundle in its one side, and carbon fiber filament bundle is blocked to some, and every is 35cm.Stretch abreast row's paving taking 10mm as interval and be pressed into pressure roller at the warp-wise of this composite sheet; Spread carbon fiber filament bundle in broadwise with same spacing row again, form the composite sheet of orthogonal square net.Cut unnecessary carbon fiber filament bundle part, the PVC film that is greater than 30cm with width seals this face.Obtain the parallel flexing of one side square net and arrange electromagnetic shielding sheet, as shown in Fig. 1 c.
As shown in Figure 4, be electromagnetic shielding effectiveness EMSE (Electro-Magnetic Shielding Efficiency) curve, i.e. the EMSE-frequency curve of the electromagnetic shielding sheet shown in Fig. 1 c.It is arranged composite sheet with the single flexing of same structure parameter and compares with the single orthogonal grid arrangement composite sheet of stretching, gather single flexing and be arranged in 0.02GHz～1.2GHz and the single advantage of orthogonal arrangement at the screening effectiveness of 0.6GHz～1.2GHz of stretching, be better than single flexing at the frequency measurement Duan Shangjun of institute and arrange composite sheet and the single orthogonal grid arrangement composite sheet of stretching, especially in the peak value maximum at 0.4 GHz place, reach 14.89dB.
Get interfascicular apart from being 5mm, needle gage is
λ=4
dcomposite sheet a slice that the orthogonal flexing of=20mm is arranged is carried out the orthogonal laying of stretching of carbon fiber filament bundle in its one side, and carbon fiber filament bundle is blocked to some, and every is 35cm.Stretch abreast row's paving taking 2mm as interval and be pressed into pressure roller at the warp-wise of this composite sheet; Spread carbon fiber filament bundle in broadwise with same spacing row again, form the composite sheet of orthogonal square net.Cut unnecessary carbon fiber filament bundle part, the PVC film that is greater than 30cm with width seals this face.Obtain the orthogonal flexing of one side square net and arrange electromagnetic shielding sheet.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 1.
embodiment 3
Get interfascicular apart from being 2mm, needle gage is
λ=2
dcomposite sheet a slice that the parallel flexing of=4mm is arranged is carried out the parallel laying of stretching of carbon fiber filament bundle in its one side, and carbon fiber filament bundle is blocked to some, and every is 35cm.Stretch abreast row's paving taking 2mm as interval and be pressed into pressure roller at the warp-wise of this composite sheet, cutting unnecessary carbon fiber filament bundle part, the PVC film that is greater than 30cm with width seals this face.Obtain the parallel flexing in the same way of one side and arrange electromagnetic shielding sheet, as shown in Figure 1a.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 1..
embodiment 4
Get interfascicular apart from being 5mm, needle gage is
λ=2
dcomposite sheet a slice that the orthogonal flexing of=10mm is arranged is carried out the orthogonal laying of stretching of carbon fiber filament bundle in its one side, and carbon fiber filament bundle is blocked to some, and every is 35cm.Stretch abreast row's paving taking 5mm as interval and be pressed into pressure roller at the warp-wise of this composite sheet; Then foamed sheet is horizontally rotated to 60 ° of angles, on this face, cut unnecessary carbon fiber filament bundle part with uniform distances tiling carbon fiber filament bundle, the PVC film that is greater than 30cm with width seals this face.Obtain the orthogonal flexing of one side network and arrange electromagnetic shielding sheet, as shown in Figure 1 d.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 1..
Table 1 embodiment 1～4 mono-layer single-face flexing and the electromagnetic shielding property contrast frequently of stretching arrangement composite electromagnetic screen sheet
Raw materials used is commercially available polyacrylonitrile (PAN) base carbon fibre endless tow, 200tex/2000F; PS foamed sheet, TPU pad pasting.
Carbon fiber filament bundle flexing is arranged the mode of composite sheet preparation with mono-layer single-face.
Adopt the orthogonal flexing of mono-layer single-face network of the structural parameters system in embodiment 4 to arrange one of electromagnetic shielding sheet, it is 5mm that its flexing is arranged interfascicular distance; Needle gage is 10mm; The spacing of stretching oblique arrangement is 5mm.Again this sheet is turned to the back side, to stretch the mode of orthogonal arrangement, same spacing 5mm row paving carbon fiber filament bundle and to be pressed in this electromagnetic shielding sheet, then with fabric width be greater than 30cm TPU paste mould be closely attached on grid, suitably pressurization is carried out sealing to it, makes the different rhombuses of single-layer double-side and square net and orthogonal flexing and arranges compound electromagnetic shielding sheet.
As shown in Figure 5, arrange electromagnet shield effect-frequency test curve of compound electromagnetic shielding sheet for the different rhombuses of single-layer double-side and square net and orthogonal flexing.Its with the single two-sided identical square net of same structure parameter with compared with the electromagnetic shielding sheet effectiveness of single two-sided same diamond-type grid arrangement, in the frequency measurement section 0.02～2.0GHz of institute, all there is obvious advantage, especially the low ebb district having two kinds of single arrangement forms, have significantly and make up, and at the peak value of 1.4GHz up to 22.13dB.
embodiment 6
Method in employing embodiment 4 is prepared of the orthogonal flexing arrangement of mono-layer single-face network electromagnetic shielding sheet, and it is 2mm that its flexing is arranged interfascicular distance; Needle gage is 4mm; The spacing of stretching oblique arrangement is 2mm.Again this sheet is turned to the back side, arrange paving carbon fiber filament bundle and be pressed in this electromagnetic shielding sheet with same spacing 2mm, the mode of stretching orthogonal arrangement, then with fabric width be greater than 30cm TPU paste mould be closely attached on grid, suitably pressurization is carried out sealing to it, makes the different rhombuses of single-layer double-side and square net and orthogonal flexing and arranges compound electromagnetic shielding sheet.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 2.
Adopt the method in embodiment 3 to prepare one of the parallel arrangement of flexing in the same way of one side electromagnetic shielding sheet, it is 5mm that its flexing is arranged interfascicular distance; Needle gage is 10mm; The spacing being arranged in parallel is 5mm.Again this sheet is turned to the back side, with same spacing 5mm, stretching parallel mode arranges paving carbon fiber filament bundle and is pressed in this electromagnetic shielding sheet, then with fabric width be greater than 30cm TPU paste mould be closely attached on grid, suitably pressurization is carried out sealing to it, make single-layer double-side and stretch parallel flexing arrangement composite electromagnetic screen sheet, electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, it is the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 2.
embodiment 8
Adopt the method in embodiment 1 to prepare one of the parallel flexing arrangement of one side square net composite electromagnetic screen sheet, it is 10mm that its flexing is arranged interfascicular distance; Needle gage is 20mm; The spacing that square net is arranged is 10mm.Again this sheet is turned to the back side, to stretch the mode of orthogonal arrangement, same spacing 10mm row paving carbon fiber filament bundle and to be pressed in this electromagnetic shielding sheet, then with fabric width be greater than 30cm TPU paste mould be closely attached on grid, suitably pressurization is carried out sealing to it, make the parallel flexing of single-layer double-side square net and arrange electromagnetic shielding sheet, as shown in Figure 2 b.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 2.
Table 2 embodiment 5～8 single-layer double-side flexings and the electromagnetic shielding property contrast frequently of stretching arrangement composite electromagnetic screen sheet
the multiple-layer laminated electromagnetic shielding sheet of embodiment 9～12 and preparation and capability of electromagnetic shielding
Raw materials used is commercially available polyacrylonitrile (PAN) base carbon fibre endless tow, 200tex/3000F; PP foamed sheet; TPU pad pasting; Polyacrylate.Carbon fiber filament Shu Shenzhi and flexing are arranged the preparation of compound composite sheet preparation with aforementioned individual layer composite sheet.
embodiment 9
Adopt the method in embodiment 3 to prepare 4 of the parallel arrangement of flexing in the same way of one side electromagnetic shielding sheets, it is 2mm that its flexing is arranged interfascicular distance; Needle gage is 4mm; The spacing being arranged in parallel is 2mm.In the mode of closing in the face of backing layer, by bonding these four composite sheets, evenly pressurization, until bonding agent solidifies, carry out sealing without effects on surface again with polyacrylate.4 aspects that obtain are stretched parallel flexing to the back of the body and are arranged composite electromagnetic screen sheet, as shown in Figure 3 b.
As shown in Figure 6, for 4 aspects of embodiment 5 gained, the back of the body is stretched electromagnetic shielding effectiveness EMSE (Electro-Magnetic Shielding Efficiency) curve, i.e. the EMSE-frequency curve of parallel flexing arrangement composite electromagnetic screen sheet.It is arranged in parallel compared with the electromagnetic shielding sheet effectiveness of arranging with 4 layers of single flexing with single 4 layers of same structure parameter, combine the advantage of the two, screening effectiveness at low-frequency range (0.2～0.8GHz) and high band (1.4～2GHz) is significantly improved, and reaches 26.89 dB at the peak value at 1.1GHz place.
embodiment 10
Adopt method in embodiment 2 to prepare 4 of the electromagnetic shielding sheets that the orthogonal flexing of one side square net arranges, its flexing is arranged interfascicular apart from being 2mm; Needle gage is 4mm; The spacing of grid arrangement is 2mm.In face-to-face laminated mode, by bonding these four composite sheets, evenly pressurization, until bonding agent solidifies, carry out sealing without effects on surface again with polyacrylate.Obtain the orthogonal flexing of 4 aspect opposite square net and arrange composite electromagnetic screen sheet.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 3.
embodiment 11
Adopt the method in embodiment 1 to prepare 4 of the parallel flexing electromagnetic shielding of one side square net sheets, it is 5mm that its flexing is arranged interfascicular distance; Needle gage is 10mm; The spacing of square net is 5mm.In the mode of closing in the face of backing layer, by bonding these four composite sheets, evenly pressurization, until bonding agent solidifies, carry out sealing without effects on surface again with polyacrylate.4 aspects that obtain are arranged composite electromagnetic screen sheet to the parallel flexing of back of the body square net, as shown in Figure 3 a.Electromagnetic shielding effectiveness EMSE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 3.
Adopt the method in embodiment 4 to prepare 4 of the orthogonal flexing arrangement of one side network electromagnetic shielding sheets, it is 5mm that its flexing is arranged interfascicular distance; Needle gage is 10mm; The spacing of network is 5mm.In face-to-face laminated mode with polypropylene by bonding these four composite sheets, evenly pressurization, until bonding agent solidifies, carry out sealing without effects on surface again, obtain the orthogonal flexing of 4 aspect opposite network and arrange composite electromagnetic screen sheet.Electromagnetic shielding effectiveness EM SE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 3.
embodiment 13
Adopt the method for the carbon fiber filament bundle flexing arrangement composite sheet of preparation in embodiment 1～4 to prepare the composite sheet that parallel flexing is arranged, then this sheet is rotated after 90o, in mode similarly by carbon fiber filament bundle with flexural wave form along the in-plane of this foamed sheet by bundle, sew up in this foamed sheet equally spacedly, obtain orthogonal flexing and arrange composite sheet.Again this sheet is rotated to 45 °, lay described carbon fiber is laid to square net arrangement according to the method in embodiment 1, and with fabric width be greater than 30cm TPU paste mould be closely attached on grid, suitably pressurization is carried out sealing to it, obtains rotating 45 ° of orthogonal flexings of two-sided square net and arranges electromagnetic shielding sheet; Adopt the preparation method in embodiment 1 to prepare 2 of mono-layer single-face square net flexing arrangement electromagnetic shielding sheets, in aspectant mode laminated with the orthogonal flexing arrangement of 45 ° of two-sided square nets of above-mentioned prepared rotation electromagnetic shielding sheet, method is by bonding these three composite sheets, evenly pressurization with polyacrylate, until bonding agent solidifies, carry out sealing without effects on surface again, obtain 3 aspect opposites and arrange and rotate 45 ° of orthogonal flexings of two-sided square net and arrange laminated electromagnetic shielding sheet in the face of the parallel flexing of the compound one side square net of the back of the body.Electromagnetic shielding effectiveness EM SE (the electro-magnetic shielding efficiency) curve of this electromagnetic shielding sheet, i.e. the Measurement and analysis of EMSE-frequency curve, its relatively high electromagnetic shielding frequency band and EMSE peak value refer to table 3.
Table 3 embodiment 9～13 multilayer flexings and the electromagnetic shielding property contrast frequently of stretching arrangement composite electromagnetic screen sheet
Claims (8)
1. an electromagnetic shielding sheet, comprises at least one deck electromagnetic shielding sheet, and described electromagnetic shielding sheet comprises base material, the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching, the described carbon fiber filament bundle existing with flexural wave form is interspersed in base material, the described carbon fiber filament bundle stretching is embedded in the single or double of base material, it is characterized in that, the described carbon fiber filament bundle existing with flexural wave form is arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the bearing of trend of multiple carbon fiber filament bundles that exist with flexural wave form, spacing equates, described orthogonal arrangement is that multiple carbon fiber filament bundles that exist with flexural wave form are divided into two groups, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in every group is parallel to each other, spacing equates, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in two groups is mutually vertical, described oblique is arranged as multiple carbon fiber filament bundles that exist with flexural wave form and is divided into two groups, the bearing of trend of the carbon fiber filament bundle existing with flexural wave form in every group is parallel to each other, spacing equates, the angle of the bearing of trend of the carbon fiber filament bundle existing taking flexural wave form in two groups is acute angle.
2. an electromagnetic shielding sheet, comprises at least one deck electromagnetic shielding sheet, and described electromagnetic shielding sheet comprises base material, the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching, the described carbon fiber filament bundle existing with flexural wave form is interspersed in base material, the described carbon fiber filament bundle stretching is embedded in the single or double of base material, it is characterized in that, the described carbon fiber filament bundle stretching is arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for multiple carbon fiber filament bundles that stretch, spacing equates, described orthogonal arrangement is that multiple carbon fiber filament bundles that stretch are divided into two groups, the carbon fiber filament bundle stretching in every group is parallel to each other, spacing equates, the carbon fiber filament bundle stretching in two groups is mutually vertical, described oblique is arranged as multiple carbon fiber filament bundles that stretch and is divided into two groups, the carbon fiber filament bundle stretching in every group is parallel to each other, spacing equates, the angle of the carbon fiber filament bundle stretching in two groups is acute angle.
3. electromagnetic shielding sheet as claimed in claim 1 or 2, is characterized in that, the bearing of trend of the described carbon fiber filament bundle existing taking flexural wave form is identical with the bearing of trend of the carbon fiber filament bundle stretching, vertical or angle is acute angle mutually.
4. electromagnetic shielding sheet as claimed in claim 1 or 2, is characterized in that, between described electromagnetic shielding sheet, adopt in the face of back to together laminated, align laminated face-to-face or rotate laminated mode and be combined with each other.
5. electromagnetic shielding sheet as claimed in claim 1 or 2, is characterized in that, described base material is high polymer foamed sheet.
6. electromagnetic shielding sheet as claimed in claim 5, is characterized in that, described high polymer foamed sheet is foamed polystyrene sheet, polypropylene expanded or foam polyvinyl chloride sheet.
7. electromagnetic shielding sheet as claimed in claim 1 or 2, it is characterized in that, described at least one deck electromagnetic shielding sheet is done as a whole, and its upside and downside are provided with sealing film, described sealing film is high-polymer membrane, fabric or high polymer foamed sheet, pastes sealing by binding agent.
8. the preparation method of the electromagnetic shielding sheet described in claim 1 or 2, it is characterized in that, comprise: on base material, arrange the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching, obtain single or multiple electromagnetic shielding sheets, multiple electromagnetic shielding sheets are combined with each other, obtain electromagnetic shielding sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110288286.4A CN102427711B (en) | 2011-09-27 | 2011-09-27 | Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110288286.4A CN102427711B (en) | 2011-09-27 | 2011-09-27 | Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof |
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| CN102427711A CN102427711A (en) | 2012-04-25 |
| CN102427711B true CN102427711B (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110288286.4A Expired - Fee Related CN102427711B (en) | 2011-09-27 | 2011-09-27 | Electromagnetic shielding sheet with flexural and unbent composite arrangement of carbon fiber endless tow and preparation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102975420B (en) * | 2012-11-28 | 2016-08-10 | 宁波和谐信息科技有限公司 | Composite elastic material screen cloth for building |
| CN108097560B (en) * | 2017-11-13 | 2021-04-02 | 上海无线电设备研究所 | Wave absorber preparation method based on three-dimensional forming and corresponding wave absorber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163828A (en) * | 2005-04-19 | 2008-04-16 | 帝人株式会社 | Carbon fiber composite sheet, use of the same as heat transferring article, and sheet for pitch-based carbon fiber mat for use therein |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005011878A (en) * | 2003-06-17 | 2005-01-13 | Inoac Corp | Electromagnetic wave absorber |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101163828A (en) * | 2005-04-19 | 2008-04-16 | 帝人株式会社 | Carbon fiber composite sheet, use of the same as heat transferring article, and sheet for pitch-based carbon fiber mat for use therein |
Non-Patent Citations (3)
| Title |
|---|
| 《碳纤维集合体材料吸波性能研究进展》;吴瑜等;《扬州职业大学学报》;20101231;第14卷(第4期);第37-41页 * |
| JP特开2005-11878A 2005.01.13 |
| 吴瑜等.《碳纤维集合体材料吸波性能研究进展》.《扬州职业大学学报》.2010,第14卷(第4期),第37-41页. |
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| CN102427711A (en) | 2012-04-25 |
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