CN102320179B - Electro-magnetic shielding sheet with long carbon fiber tows inlaid and arranged into strip grid and preparation method - Google Patents
Electro-magnetic shielding sheet with long carbon fiber tows inlaid and arranged into strip grid and preparation method Download PDFInfo
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Abstract
The invention relates to an electro-magnetic shielding sheet with long carbon fiber tows inlaid and arranged into a strip grid and a preparation method. The electro-magnetic shielding sheet comprises at least a layer of electro-magnetic shielding piece and is characterized in that each electro-magnetic shielding piece comprises a substrate, long carbon fiber tows existing in the form of flexural waves and extended long carbon fiber tows, wherein at least the long carbon fiber tows existing in the form of flexural waves or the extended long carbon fiber tows are distributed in a stripped manner to form at least long carbon fiber tow strips existing in the form of flexural waves or extended long carbon fiber tow strips. The electro-magnetic shielding sheet and the preparation method have the following beneficial effects: when the long carbon fiber tows combine extended arrangement and flexural arrangement, the electro-magnetic shielding sheet can combine the advantages of the electro-magnetic shielding effects of flexural arrangement and extended arrangement and the shielding efficiency of the electro-magnetic shielding sheet toward the electro-magnetic waves is improved as a whole.
Description
Technical field
The present invention relates to a kind of carbon fiber filament bundle grid and inlay electromagnetic shielding sheet and the preparation method of arrangement, belong to electromagnetic shielding material technical field.
Background technology
Being widely used of the computer equipment that scientific and technological progress brings, radio telephone, communication equipment, network and high-frequency device etc., causes electromagnetic radiation pollution, and the environmental security causing is thus urgently to be resolved hurrily.
The existence of electromagnetic pollution meeting serious harm human health and other biology, and the normal operation of communication and electric/electronic device is caused to error, this all needs protection.Protection to human body, mainly adopts fabric, the improvement of the electromagnetic wave shielding of fabric is had been reported, but mainly with the conductive fibers such as metal are wired, inweave or blending is weaved greatly.Though carbon fiber has conduction property, because of its fragility, be mixed into net or directly mix high polymer mainly with staple in bulk, with the composition of material and the change of proportioning thereof, obtain the effect of electromagnetic shielding.
The carbon fibre composite of EP1912487A1 2006 inventions of patent ENDO Morinobu, adopt ultrafine carbon fiber as resistance magnetic material, in 0.01 ~ 20% ratio application matrices of composite material, experimental results show that, ultrafine carbon fiber, as magnetic loss material, is just given the wave absorbtion that composite is very high when content is low.Patent Shi Chunsheng CN 1730555A 2005 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.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 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.Utilize the different complex method 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 form to change or to increase the absorbing property that improves material, adopt the arrangement of carbon fiber filament bundle and the compound mode of grid with the present invention, the principle, the preparation method that improve the electromagnetic shielding effectiveness of material are all different.
Summary of the invention
The object of the present invention is to provide and a kind ofly can arrange and to arrange the advantage of effectiveness separately with stretching in conjunction with carbon fiber filament bundle flexing, and the electromagnetic shielding sheet and the preparation method that make on the whole it to shielding electromagnetic waves efficiency value, increase.
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, wherein, at least one of the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching is ribbon and distributes, and forms at least one of the carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching.
The described carbon fiber filament bundle existing with flexural wave form interts in base material, and the described carbon fiber filament bundle stretching row is layered at least one side of base material.
Preferably, the described carbon fiber filament bundle band 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 carbon fiber filament bundle band existing with flexural wave form, described orthogonal arrangement is that the carbon fiber filament bundle band existing with flexural wave form is divided into two groups, the carbon fiber filament bundle band existing with flexural wave form in every group is parallel to each other, the carbon fiber filament bundle band existing with flexural wave form in two groups is mutually vertical, form square grid, described oblique is arranged as the carbon fiber filament bundle band existing with flexural wave form and is divided into two groups, the carbon fiber filament bundle band existing with flexural wave form in every group is parallel to each other, the angle of the carbon fiber filament bundle band that flexural wave form exists of take in two groups is acute angle, form rhombus grid.
Preferably, the described carbon fiber filament bundle band stretching is at least arranged in parallel in one side base material, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the carbon fiber filament bundle band stretching, described orthogonal arrangement is that the carbon fiber filament bundle band stretching is divided into two groups, the carbon fiber filament bundle band stretching in every group is parallel to each other, the carbon fiber filament bundle band stretching in two groups is mutually vertical, form square grid, described oblique is arranged as the carbon fiber filament bundle band stretching and is divided into two groups, the carbon fiber filament bundle band stretching in every group is parallel to each other, the angle of the carbon fiber filament bundle band stretching in two groups is acute angle, form rhombus grid.
Preferably, the described carbon fiber filament bundle band stretching interval base material on base material two-sided is arranged in parallel, interval base material orthogonal arrangement or interval base material oblique are arranged, described interval base material is arranged in parallel and is parallel to each other for the carbon fiber filament bundle band stretching on base material two-sided, described interval base material orthogonal arrangement is that the carbon fiber filament bundle band stretching on each face of base material is parallel to each other, the carbon fiber filament bundle band stretching on face of base material is mutually vertical with the carbon fiber filament bundle band stretching on another face at base material, form square grid, the carbon fiber filament bundle band stretching that described oblique is arranged as on each face of base material is parallel to each other, the angle of the carbon fiber filament bundle band stretching on the carbon fiber filament bundle band stretching on face of base material and another face at base material is acute angle, form rhombus grid.
Preferably, the described carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching are arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the carbon fiber filament bundle band existing with flexural wave form and at least carbon fiber filament bundle band stretching of one side that is distributed in base material, described orthogonal arrangement is that the carbon fiber filament bundle band existing with flexural wave form is parallel to each other, the at least carbon fiber filament bundle band stretching of one side that is distributed in base material is parallel to each other, the carbon fiber filament bundle band existing with flexural wave form is mutually vertical with the carbon fiber filament bundle band stretching at least simultaneously that is distributed in base material, form square grid, described oblique is arranged as straight carbon fiber filament bundle band and is parallel to each other, the carbon fiber filament bundle band that the flexural wave form of take exists is acute angle with at least angle of the carbon fiber filament bundle band stretching of one side that is distributed in base material, form rhombus grid.
More preferably, the described carbon fiber filament bundle band stretching is stacked arrangement, and the two sides that described being stacked is arranged as at least one ribbon region of base material is all distributed with the carbon fiber filament bundle band stretching.
More preferably, the described carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching are inlayed arrangement, described inlaying be arranged as that at least a portion is not distributed with the carbon fiber filament bundle band existing with flexural wave form or the base material of the carbon fiber filament bundle band that stretches on the carbon fiber filament bundle band that is distributed with the carbon fiber filament bundle band stretching or exists with flexural wave form.
Preferably, described electromagnetic shielding sheet adopt alignment face-to-face laminated, in the face of back to neat laminated 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, the described carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching be all through through pre-twisting, or through impregnation or scrape the rounded and constitutionally stable carbon fiber filament bundle in the cross section of slurry baking and curing.
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 described high polymer foamed sheet itself, by binding agent, pastes sealing.
The present invention also provides the preparation method of above-mentioned electromagnetic shielding sheet, it is characterized in that, comprise: on base material, make the carbon fiber filament bundle existing with flexural wave form and arrange the carbon fiber filament bundle stretching, at least one that makes the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching is ribbon and distributes, obtain single or multiple electromagnetic shielding sheets, a plurality of electromagnetic shielding sheets are combined with each other, obtain electromagnetic shielding sheet.
Compared with prior art, the present invention has following beneficial effect:
1, when adopting carbon fiber filament Shu Shenzhi of the present invention to arrange and flexing arranges compound arrangement, can arrange and stretch in conjunction with flexing and arrange the advantage of effectiveness separately, on the whole shielding electromagnetic waves efficiency value is increased.
2, materials of the present invention are few, effectiveness good;
3, the product of gained of the present invention can be for the lining material of protective garment and the interior trim barrier material of light structure building materials and the vehicles of electromagnetic shielding.
Accompanying drawing explanation
Fig. 1 a be the whole flexings of one side parallel+ribbon stretches the band that is arranged in parallel and inlays electromagnetic shielding chip architecture schematic diagram;
Fig. 1 b be one side band flexing parallel+all stretch oblique rhombus band and inlay electromagnetic shielding chip architecture schematic diagram;
Fig. 1 c is that one side band flexing quadrature+ribbon stretches the square grid of quadrature and inlays electromagnetic shielding chip architecture schematic diagram;
Fig. 1 d be one side band flexing parallel+ribbon stretches the square grid of quadrature and inlays electromagnetic shielding chip architecture schematic diagram;
Fig. 2 a is that flexing horizontal stripe+two-sided identical grid that stretches vertical bar and horizontal stripe (the rotating 90 °) quadrature of being separated by is inlayed electromagnetic shielding chip architecture schematic diagram;
Fig. 2 b is that flexing oblique rhombus grid+two-sided difference is stretched oblique parallel slanted bar and the oblique grid rhombus being stacked of being separated by and inlayed electromagnetic shielding chip architecture schematic diagram;
Fig. 2 c is that the square grid of flexing quadrature+two-sided difference is stretched the square electromagnetic shielding chip architecture schematic diagram of inlaying that the square grid of quadrature is separated by and is stacked with parallel horizontal stripe;
Fig. 2 d is that band flexing oblique (rotating 45 °) rhombus grid+two-sided difference is stretched oblique (rotating 45 °) rhombus grid and all stretches the parallel electromagnetic shielding chip architecture schematic diagram of inlaying;
Fig. 2 e is that the two-sided identical square grid of quadrature that stretches of whole flexings oblique (60 °)+band is inlayed electromagnetic shielding chip architecture schematic diagram;
Fig. 2 f is that the parallel vertical bar of flexing+two-sided difference is stretched parallel vertical bar and the square grid of quadrature and is separated by be stacked and inlays electromagnetic shielding chip architecture schematic diagram;
Fig. 3 a is that n layer flexing oblique rhombus grid+two-sided difference is stretched the laminated electromagnetic shielding chip architecture schematic diagram that oblique rhombus grid and the square grid of quadrature are inlayed electromagnetic shielding sheet;
Fig. 3 b is that the square grid of one side flexing quadrature+the stretch square grid of quadrature 4 aspects of inlaying electromagnetic shielding sheet of being separated by are each other closed electromagnetic shielding chip architecture schematic diagram to backing layer;
To be one side flexing vertical bar stretch parallel inlaying+all stretch 4 aspect opposite laminated electromagnetic shielding chip architecture schematic diagrames of diamond array grid electromagnetic shielding sheet with ribbon to Fig. 3 c.
Fig. 3 d be 3 whole flexings of one side parallel+stretch parallel strip band grid and inlay on electromagnetic shielding sheet two-layer face-to-face, lower two-layer in the face of carry on the back and do 45 ° of 3 layers of electromagnetic shielding chip architecture schematic diagrames that rotation is laminated in the same way.
Fig. 4 be the whole flexings of one side parallel+ribbon stretches rhombus band and inlays electromagnet shield effect-frequency test curve of arranging electromagnetic shielding sheet;
Fig. 5 is the two-sided identical electromagnet shield effect-frequency test curves that oblique rhombus band is inlayed electromagnetic shielding sheet that stretch of whole oblique rhombus flexing arrangement+bands;
Fig. 6 be 4 aspects to back of the body band flexing parallel+all stretch electromagnet shield effect-frequency test curve that oblique diamond array band is inlayed electromagnetic shielding sheet.
The specific embodiment
Electromagnetic shielding sheet of the present invention, comprise at least one deck electromagnetic shielding sheet, described electromagnetic shielding sheet comprises base material, the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching, wherein, at least one of the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching is ribbon and distributes, and forms at least one of the carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching.Preparation process is specific as follows:
(1) preparatory stage: one, carbon fiber 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, obtains cross section for circular, constitutionally stable carbon fiber filament bundle, to make and arrange to spread, uses; Its two, high polymer foamed sheet can be selected PS foamed sheet, PP foamed sheet or PVC foamed sheet.
(2) the carbon fiber filament bundle existing with flexural wave form make step: be on foamed sheet or the banded zone that limits of foamed sheet in by carbon fiber filament bundle with flexural wave form along the in-plane of foamed sheet by bundle, penetrate equally spacedly in foamed sheet, or after rotating 90o or other angles q angle, in-plane in the banded zone in the same way carbon fiber filament bundle being limited along this foamed sheet or foamed sheet with flexural wave form is by bundle, sew up equally spacedly in this foamed sheet or in the banded zone limiting, obtain all or ribbon parallel, quadrature or oblique flexing are arranged electromagnetic shielding sheet, be called for short flexing evenly or flexing grid electromagnetic shielding sheet.Be preferably all or ribbon is parallel and quadrature flexing is arranged.Described flexing waveform is similar to sine wave, and wavelength is needle gage; Interfascicular is apart from the distance that is the carbon fiber filament interfascicular that adopts.Taking the interfascicular of carbon fiber filament bundle is (1 ~ 10) apart from the ratio with needle gage: (1 ~ 20), preferentially adopting interfascicular distance is 1:2 with the ratio of needle gage.Flexural wave form will keep uniformity at 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) row of the carbon fiber filament bundle stretching spreads step: be on foamed sheet or the banded zone that limits of foamed sheet in by carbon fiber filament Shu Yiyi determining deviation arrange be abreast laid on foamed sheet or banded zone that foamed sheet limits in, with pressure cylinder, be pressed into again the top layer of high polymer foamed sheet, obtain carbon fiber filament ribbon and stretch and be arranged in parallel; Stretching on the basis being arranged in parallel, this sheet is horizontally rotated behind 90o or other angles q angle, with a determining deviation, tile described carbon fiber filament bundle on this foamed sheet or in the banded zone of foamed sheet restriction, with pressure cylinder, be pressed into again the top layer of high polymer foamed sheet, carbon fiber filament bundle all or ribbon stretch the electromagnetic shielding sheet of parallel, quadrature or diamond array, be called for short and stretch evenly or stretch grid electromagnetic shielding sheet.
(4) mono-layer single-face carbon fiber filament bundle grid is inlayed the preparation of arranging electromagnetic shielding sheet: the electromagnetic shielding sheet of getting process (2) or process (3) gained, the method that spreads or make by the row of process (3) or process (2) is carried out the row's of stretching paving or the flexural wave of described carbon fiber filament bundle and is made on got process (2) or process (3) electromagnetic shielding sheet, obtain flexing and arrange and stretch the one side electromagnetic shielding sheet that collating strip is inlayed or grid is inlayed, this sheet has at least a direction to have banded arrangement.Get flexing arrange in all or ribbon is parallel, quadrature or oblique flexing in arranging any one with stretch arrangement in corresponding ribbon or all any one combinations in parallel, quadrature or the arrangement of oblique flexing; Or flexing arranges and respectively to get a kind of ribbon in arrangement and arrange and combine with stretching, to form, carbon fiber filament bundle band is inlayed or grid is inlayed arrangement.Can obtain thus the one side electromagnetic shielding sheet of three types: the whole flexings of one side (parallel, quadrature or oblique) arrangement+ribbon stretches (parallel, quadrature or rhombus) electromagnetic shielding sheet that collating strip is inlayed or grid is inlayed; Or one side all stretches (parallel, quadrature or rhombus) arrangement+ribbon flexing (parallel, quadrature or oblique) electromagnetic shielding sheet that collating strip is inlayed or grid is inlayed; Or banded flexing (parallel, quadrature or the oblique) arrangement+ribbon of single-face strip stretches (parallel, quadrature or rhombus) one side electromagnetic shielding sheet that collating strip is inlayed or grid is inlayed.As shown in Figure 1a, for the whole flexings of one side parallel+ribbon stretches the band that is arranged in parallel and inlays electromagnetic shielding chip architecture schematic diagram, as shown in Figure 1 b, for one side band flexing parallel+all stretch oblique rhombus band and inlay electromagnetic shielding chip architecture schematic diagram, as shown in Fig. 1 c, for stretching the square grid of quadrature, one side band flexing quadrature+ribbon inlays electromagnetic shielding chip architecture schematic diagram, as shown in Figure 1 d, for one side band flexing parallel+ribbon stretches the square grid of quadrature and inlays electromagnetic shielding chip architecture schematic diagram; If it is laminated that this electromagnetic shielding sheet is not done, in the mode of gluing or pad pasting to forming the carbon fiber filament Shu Jinhang sealing of grid, can obtain the one side electromagnetic shielding sheet of institute's three types.
(5) single-layer double-side carbon fiber filament bundle grid is inlayed the preparation of arranging electromagnetic shielding sheet: by any one upset back side of the one side electromagnetic shielding sheet of the three types of gained in process (4) (object is for avoiding being arranged in the loosening slippage of the carbon fiber filament bundle of the row's of the stretching paving on foamed sheet) upwards, with in the same way or horizontally rotate arbitrarily angled after, the row that the carbon fiber filament Shu Shenzhi of repetitive process (3) arranges spreads step, obtains two-sided electromagnetic shielding sheet.Be preferably and horizontally rotate 90 ° or 45 °, and band alignment.Adopting the whole or ribbon same with one side to stretch (parallel, quadrature or rhombus), to arrange the two-sided electromagnetic shielding sheet of row's paving be identical two-sided electromagnetic shielding sheet; Adopting the whole or ribbon different from one side to stretch (parallel, quadrature or rhombus), to arrange the two-sided electromagnetic shielding sheet of row's paving be different two-sided electromagnetic shielding sheets.Fig. 2 a is that flexing horizontal stripe+two-sided identical grid that stretches vertical bar and horizontal stripe (the rotating 90 °) quadrature of being separated by is inlayed electromagnetic shielding chip architecture schematic diagram, Fig. 2 b is that flexing oblique rhombus grid+two-sided difference is stretched oblique parallel slanted bar and the oblique grid rhombus being stacked of being separated by and inlayed electromagnetic shielding chip architecture schematic diagram, Fig. 2 c is that the square grid of flexing quadrature+two-sided difference is stretched the square electromagnetic shielding chip architecture schematic diagram of inlaying that the square grid of quadrature is separated by and is stacked with parallel horizontal stripe, Fig. 2 d is that band flexing oblique (rotating 45 °) rhombus grid+two-sided difference is stretched oblique (rotating 45 °) rhombus grid and all stretches the parallel electromagnetic shielding chip architecture schematic diagram of inlaying, Fig. 2 e is that the two-sided identical square grid of quadrature that stretches of whole flexings oblique (60 °)+band is inlayed electromagnetic shielding chip architecture schematic diagram, Fig. 2 f is that the parallel vertical bar of flexing+two-sided difference is stretched parallel vertical bar and the square grid of quadrature and is separated by be stacked and inlays electromagnetic shielding chip architecture schematic diagram.If do not do laminated, in the mode of gluing or pad pasting to forming the carbon fiber filament Shu Jinhang sealing of second, obtain flexing and arrange and stretch permutation and combination grid phase electromagnetic shielding sheet embedding, that single-layer double-side is identical or single-layer double-side is different.
(6) preparation of MULTILAYER COMPOSITE electromagnetic shielding sheet: at least get the electromagnetic shielding sheet being made by process (4) and (5) a kind of, carry out two classes laminated a: class is in the face of back to neat laminated or align face-to-face laminated; One class is that rotation is laminated.
A. close or face-to-face laminated mode in the face of backing layer: described refers to got individual layer electromagnetic shielding sheet in the face of backing layer closes, in the bonding mode in the front of a slice and the back side of another sheet.Described face-to-face laminated referring to got individual layer electromagnetic shielding sheet with vis-a-vis between two, or the relative bonding mode in the back side between two.
B. rotate laminated mode: described rotation is laminated refer to every individual layer electromagnetic shielding sheet relative to the rotating in same direction of adjacent layer or a positive and a negative bonding after rotating.Described rotation can be arbitrarily angled, but to parallel and electromagnetic shielding sheet quadrature class, is preferentially to rotate 90 ° or 45 °; Electromagnetic shielding sheet to rhombus class, laminated with self, is preferentially to rotate 90 ° or 45 °; With parallel laminated with electromagnetic shielding sheet quadrature class, be preferentially that the 1/2(of the acute angle b of this rhombus of rotation is b/2) or rotate b/2+90 °.
Fig. 3 a is that n layer flexing oblique rhombus grid+two-sided difference is stretched the laminated electromagnetic shielding chip architecture schematic diagram that oblique rhombus grid and the square grid of quadrature are inlayed electromagnetic shielding sheet, Fig. 3 b is that the square grid of one side flexing quadrature+the stretch square grid of quadrature 4 aspects of inlaying electromagnetic shielding sheet of being separated by are each other closed electromagnetic shielding chip architecture schematic diagram to backing layer, and to be one side flexing vertical bar stretch parallel inlaying+all stretch 4 aspect opposite laminated electromagnetic shielding chip architecture schematic diagrames of diamond array grid electromagnetic shielding sheet with ribbon to Fig. 3 c.Fig. 3 d be 3 whole flexings of one side parallel+stretch parallel strip band grid and inlay on electromagnetic shielding sheet two-layer face-to-face, lower two-layer in the face of carry on the back and do 45 ° of 3 layers of electromagnetic shielding chip architecture schematic diagrames that rotation is laminated in the same way.
Below in conjunction with embodiment, further describe the present invention, but do not limit content of the present invention.
embodiment 1 ~ 4 mono-layer single-face electromagnetic shielding sheet and preparation and capability of electromagnetic shielding:
Raw materials used is commercially available polyacrylonitrile (PAN) base carbon fibre endless tow, 200tex/3000F; PVC foamed sheet, silicon rubber.
Carbon fiber filament bundle all or bar trellis flexing arrange the preparation of electromagnetic shielding sheet: 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 is apart from being half-wavelength,
d=
λ/ 2.Adopt special steel wire pin, with carbon fiber filament bundle to shuttle back and forth in PVC foamed sheet or in foamed sheet localized area to and fro one on the other, form flexural wave form, until all carbon fiber filament bundles have been worn, or after rotating 90o or q angle, 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, make the electromagnetic shielding sheet that whole or banded parallel, quadrature or oblique flexing are arranged.Preferentially, flexing is arranged when stretching the preparation of arranging the alternate phase embedding of grid electromagnetic shielding sheet in this way, the flexing arrangement that can hocket incessantly make and stretch arranging of arrangement.
embodiment 1
Get interfascicular apart from being 5mm, needle gage is
λ=2
delectromagnetic shielding sheet a slice that the whole parallel flexing of=10mm is arranged.This sheet is divided into three parts along warp-wise, be divided into the San Ge region, left, center, right that area is 10cm * 30cm, carbon fiber filament bundle is blocked to some, every is 30cm, the 5mm of take in region, left and right vertically arranges and stretches parallel carbon fiber filament bundle as spacing, then this sheet is rotated to 60 °, at this sheet, along each 10cm of broadwise two ends, be with same spacing parallel laid arranged carbon fiber endless tow in the scope of 30cm * 10cm, must stretch rhombus grid, the PVC film that is greater than 30cm with width seals this face.Obtain the whole flexings of one side parallel+ribbon stretches rhombus band and inlays and arrange electromagnetic shielding sheet.
As shown in Figure 4, the whole flexings of one side are parallel+and ribbon stretches rhombus band and inlays electromagnet shield effect-frequency test curve of arranging electromagnetic shielding sheet, i.e. EMSE (electro-magnetic shielding efficiency)-frequency curve.It is arranged electromagnetic shielding sheet with the single flexing of same structure parameter and compares with the single network arrangement electromagnetic shielding sheet that stretches, having gathered single flexing is arranged in 0.2GHz ~ 0.6 GHz and 1.6GHz ~ 2.0GHz and singlely stretches the advantage that network is arranged in the shield effectiveness of 0.8GHz ~ 17GHz, at the frequency measurement Duan Shangjun of institute, be better than single flexing and arrange electromagnetic shielding sheet and the single orthogonal grid arrangement electromagnetic shielding sheet that stretches, especially maximum at the peak value at 0.4 GHz place, reach 16.89dB.
embodiment 2
Get interfascicular apart from being 10mm, needle gage is
λ=2
d=20mm, foamed sheet is from left to right divided into three parts, be that area is the San Ge region, left, center, right of 10cm * 30cm, in region, left and right, carry out making of flexing arrangement, obtain bar trellis flexing vertical bar and arrange electromagnetic shielding sheet a slice, then in its one side, carry out the laying of whole carbon fiber filament Shu Shenzhi rhombuses.Carbon fiber filament bundle is blocked to some, every is 30cm, on PVC foamed board, take 10mm as the parallel laying carbon fiber filament bundle of spacing, then after this sheet being rotated to 60 ° with the carbon fiber filament bundle described in uniform distances parallel laid in this face, the PVC film that is finally greater than 30cm with width seals this face.Obtain one side band flexing parallel+all stretch oblique diamond array band and inlay electromagnetic shielding sheet, as shown in Figure 1 b.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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
Flexing is arranged and is got interfascicular apart from being 2mm, and needle gage is
λ=2
d=4mm, foamed sheet is from left to right divided into four parts, area be respectively 5cm * 30cm, 10cm * 30cm, 5cm * 30cm and 10cm * 30cm with four regions, in the 1st and 3 regions, carry out making of positive flexing arrangement, obtain vertical bar shape flexing horizontal stripe and arrange electromagnetic shielding sheet a slice.On foamed sheet, carry out again the laying of band quadrature square arrangement, carbon fiber filament bundle is blocked to some, every is 30cm, in 2,4 regions, take 2mm as spacing vertical setting of types parallel laid carbon fiber filament bundle, then this sheet is rotated to 90 °, with uniform distances parallel laid carbon fiber filament bundle in middle 10cm region, obtain quadrature grid.The PVC film that is finally greater than 30cm with width seals this face.Obtain one side band flexing quadrature+ribbon and stretch the square grid of quadrature and inlay electromagnetic shielding sheet, as shown in Figure 1 d.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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
Flexing is arranged and is got interfascicular apart from being 5mm, and needle gage is
λ=2
d=10mm, is divided into three parts foamed sheet, longitudinally carries out continuously successively parallel flexing and makes+stretch parallel carbon fiber row paving+parallel flexing and make, until terminate in the San Ge region, upper, middle and lower that area is 30cm * 10cm.Form upper, middle and lower and be respectively the combination that parallel flexing, vertically parallel and parallel flexing are arranged horizontal stripe, the PVC film that is finally greater than 30cm with width seals this face.Obtain one side band flexing parallel+ribbon stretches parallel orthogonal grid and inlays electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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
embodiment 5 ~ 8 single-layer double-side electromagnetic shielding sheets and preparation and capability of electromagnetic shielding
Raw materials used is commercially available polyacrylonitrile (PAN) base carbon fibre endless tow, 200tex/2000F; PS foamed sheet, TPU pad pasting.The mode of making same mono-layer single-face that carbon fiber filament bundle flexing is arranged.
embodiment 5
Adopt the structural parameters in embodiment 1 to prepare electromagnetic shielding sheet a slice that whole parallel flexings are arranged, its flexing is arranged interfascicular apart from being 5mm, and needle gage is 10mm, by 45 ° of this sheet rotations, with the parallel flexing of making of identical structural parameters, arrange, obtain whole oblique rhombus flexings and arrange electromagnetic shielding sheet a slice.Foamed sheet is gone back to after original position, this sheet is divided into three parts, it is the left side that area is 10cm * 30cm, in, right three regions, carbon fiber filament bundle is blocked to some, every is 30cm, the 5mm of take in region, left and right vertically arranges and stretches parallel carbon fiber filament bundle as spacing, then this sheet is rotated to 60 °, in the scope of these sheet two ends 10cm with same spacing parallel laid arranged carbon fiber endless tow, must stretch rhombus grid, again this sheet is turned to the back side, repeat said process, the TPU that finally adopts fabric width to be greater than 30cm pastes mould and is closely attached on foamed sheet, suitably pressurization is carried out sealing to it, make the two-sided identical oblique rhombus band that stretches of the whole oblique rhombus of individual layer flexing arrangement+band and inlay electromagnetic shielding sheet.
As shown in Figure 5, whole two-sided identical electromagnet shield effect-frequency test curves that oblique rhombus band is inlayed electromagnetic shielding sheet that stretch of oblique rhombus flexing arrangement+band.The diamond array of more single flexing oblique is compared with the single network that stretches, and this structure electromagnetic shielding sheet not only combines the two in the advantage of frequency range separately, and shield effectiveness value increases on the whole.At 1.4 GHz places, its peak value reaches 22.13dB.
embodiment 6
Adopting the one side band flexing of preparation in embodiment 4 parallel+ribbon stretches parallel orthogonal grid and inlays electromagnetic shielding sheet a slice, first do not do sealing.Its flexing is arranged interfascicular apart from being 2mm, and needle gage is
λ=2
d=4mm, the spacing that is arranged in parallel is 2mm.After this sheet is rotated to 90 °, stretch parallel in parallel zone and spread described carbon fiber filament bundle being equipped with.By this sheet upset back side upwards, on this sheet, carry out the arrangement of whole carbon fiber filament Shu Shenzhi quadrature square nets, the TPU that finally adopts fabric width to be greater than 30cm pastes mould and is closely attached on foamed sheet, suitably pressurization is carried out sealing to it, makes parallel+two-sided different ribbons of band flexing and stretches the square grid of quadrature and inlay and all stretch square net and inlay electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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.
embodiment 7
Adopt method in embodiment 3 to prepare one side band flexing quadrature+ribbon and stretch the square grid of quadrature and inlay electromagnetic shielding sheet a slice, first do not do sealing, but adopt pressure cylinder that quadrature grid is pressed into foamed sheet.Its flexing is arranged interfascicular apart from being 5mm, and needle gage is
λ=2
d=10mm, orthogonal arrangement spacing is 5mm.By this sheet upset back side upward, do in the same way the laying of carbon fiber filament Shu Shenzhi quadrature grid with parameter, the TPU that finally adopts fabric width to be greater than 30cm pastes mould and is closely attached on foamed sheet, suitably pressurization is carried out sealing to it, makes the two-sided identical square grid of quadrature that stretches of individual layer band flexing quadrature+band and inlays electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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.
embodiment 8
Get interfascicular apart from being 10mm, needle gage is
λ=2
d=20mm, horizontally rotates 60 ° by foamed sheet and carries out making of flexing arrangement, obtains whole flexing arranged askew electromagnetic shielding sheet a slices.Foamed sheet is gone back to after original position, this sheet is divided into three parts, be that area is the San Ge region, left, center, right of 10cm * 30cm, this sheet is horizontally rotated to 45 °, in region, left and right, with spacing 10mm parallel, spread carbon fiber filament bundle, must stretch quadrature grid (rotating 45 °), with pressure cylinder, this quadrature grid is pressed in foamed sheet.Again this sheet is turned over to row's paving of stretching in the same way quadrature grid with parameter, the TPU that finally adopts fabric width to be greater than 30cm pastes mould and is closely attached on foamed sheet, suitably pressurization is carried out sealing to it, makes the two-sided identical square grid of quadrature (rotating 45 °) that stretches of the whole flexings of individual layer oblique (60 °)+band and inlays electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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
embodiment 9 ~ 12 multilayer electromagnetic shielding sheets 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.The mode of making same mono-layer single-face that carbon fiber filament bundle flexing is arranged.
embodiment 9
Adopt in embodiment 2 method prepare one side band flexing parallel+all stretch oblique diamond array band and inlay four of electromagnetic shielding sheets, its flexing is arranged interfascicular apart from being 2mm, needle gage is
λ=2
d=4mm, diamond array spacing is 2mm.In the mode of closing back to surface layer, these four electromagnetic shielding sheets are bonding with polyacrylate, evenly pressurization, until bonding agent is curing, and carries out sealing with TPU pad pasting to the superiors and orlop surface.Obtain 4 aspects to back of the body band flexing parallel+all stretch oblique diamond array band and inlay electromagnetic shielding sheet.
As shown in Figure 6, be 4 aspects to back of the body band flexing parallel+all stretch electromagnet shield effect-frequency test curve that oblique diamond array band is inlayed electromagnetic shielding sheet.It stretches oblique diamond array and compares with the electromagnetic shielding sheet effectiveness of arranging with 4 layers of single flexing with single 4 layers of same structure parameter, not only combine the advantage of the two, and made up the two deficiency at the shield effectiveness of 0.5GHz ~ 0.9GHz and 1.4GHz ~ 1.7GHz, whole effectiveness is improved, and its peak value at 1.4GHz place reaches 22.98 dB.
embodiment 10
Adopt the whole flexings of one side that in embodiment 1 prepared by method parallel+ribbon stretches rhombus band and inlays and arrange four of electromagnetic shielding sheets, its flexing is arranged interfascicular apart from being 10mm, needle gage is
λ=2
d=20mm, diamond array spacing is 10mm.In face-to-face laminated mode, these four electromagnetic shielding sheets are bonding with polyacrylate, evenly pressurization, until bonding agent is curing, and carries out sealing with TPU pad pasting to the superiors and orlop surface.Obtain 4 aspects to carry on the back whole flexings parallel+ribbon stretches rhombus band and inlays and arrange electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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
One side band flexing quadrature+ribbon that in employing embodiment 3 prepared by method stretches the square grid of quadrature and inlays four of electromagnetic shielding sheets, and its flexing is arranged interfascicular apart from being 5mm, and needle gage is
λ=2
d=10mm, orthogonal arrangement spacing is 5mm.In face-to-face laminated mode, these four electromagnetic shielding sheets are bonding with polyacrylate, evenly pressurization, until bonding agent is curing, and carries out sealing with TPU pad pasting to the superiors and orlop surface.Obtaining 4 aspect opposite one side band flexing quadrature+ribbons stretches the square grid of quadrature and inlays electromagnetic shielding sheet.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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 12
Adopt method in embodiment 1 prepare the whole flexings of one side parallel+ribbon stretches rhombus band and inlays and arrange electromagnetic shielding sheet (A) a slice, adopt the two-sided identical square grid of quadrature that stretches of individual layer band flexing quadrature+band that in enforcement 7 prepared by method to inlay two of electromagnetic shielding sheets (B), its flexing is arranged interfascicular apart from being 5mm, and needle gage is
λ=2
d=10mm, orthogonal arrangement spacing is 5mm.Get 45 ° of a slice A rotations and B in aspectant mode, bonding with polyacrylate, again this compound AB sheet is rotated-45 ° with the A sheet back side and another sheet B in the mode back to face, with bonding with polyacrylate, evenly pressurization, until bonding agent is curing, and with TPU pad pasting, the superiors and orlop surface are carried out to sealing.Obtain 3 layers of whole flexing of one side one side parallel+ribbon stretches rhombus band and inlays and arrange electromagnetic shielding sheet and inlay electromagnetic shielding sheet rotation (45 °) laminated electromagnetic shielding sheet with the two-sided identical square grid of quadrature that stretches of individual layer band flexing quadrature+band.The electromagnetic shielding effectiveness EMSE of this electromagnetic shielding sheet (electro-magnetic shielding efficiency) curve, 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 ~ 12 multilayer flexings and the electromagnetic shielding property contrast frequently of stretching arrangement composite electromagnetic screen sheet
Claims (9)
1. an 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, wherein, at least one of the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching is ribbon and distributes, and forms at least one of the carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching; The described carbon fiber filament bundle existing with flexural wave form interts in base material, and the described carbon fiber filament bundle stretching row is layered at least one side of base material; The described carbon fiber filament bundle existing with flexural wave form interts in base material, and the described carbon fiber filament bundle stretching row is layered at least one side of base material; Described base material is for being foamed polystyrene sheet, polypropylene expanded or foam polyvinyl chloride sheet; The described carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching be all through pre-twisting, or through impregnation or scrape the rounded and constitutionally stable carbon fiber filament bundle in the cross section of slurry baking and curing; 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 itself, by binding agent, pastes sealing.
2. electromagnetic shielding sheet as claimed in claim 1, it is characterized in that, the described carbon fiber filament bundle band 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 carbon fiber filament bundle band existing with flexural wave form, described orthogonal arrangement is that the carbon fiber filament bundle band existing with flexural wave form is divided into two groups, the carbon fiber filament bundle band existing with flexural wave form in every group is parallel to each other, the carbon fiber filament bundle band existing with flexural wave form in two groups is mutually vertical, form square grid, described oblique is arranged as the carbon fiber filament bundle band existing with flexural wave form and is divided into two groups, the carbon fiber filament bundle band existing with flexural wave form in every group is parallel to each other, the angle of the carbon fiber filament bundle band that flexural wave form exists of take in two groups is acute angle, form rhombus grid.
3. electromagnetic shielding sheet as claimed in claim 1, it is characterized in that, the described carbon fiber filament bundle band stretching is at least arranged in parallel in one side base material, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the carbon fiber filament bundle band stretching, described orthogonal arrangement is that the carbon fiber filament bundle band stretching is divided into two groups, the carbon fiber filament bundle band stretching in every group is parallel to each other, the carbon fiber filament bundle band stretching in two groups is mutually vertical, form square grid, described oblique is arranged as the carbon fiber filament bundle band stretching and is divided into two groups, the carbon fiber filament bundle band stretching in every group is parallel to each other, the angle of the carbon fiber filament bundle band stretching in two groups is acute angle, form rhombus grid.
4. electromagnetic shielding sheet as claimed in claim 1, it is characterized in that, the described carbon fiber filament bundle band stretching interval base material on base material two-sided is arranged in parallel, interval base material orthogonal arrangement or interval base material oblique are arranged, described interval base material is arranged in parallel and is parallel to each other for the carbon fiber filament bundle band stretching on base material two-sided, described interval base material orthogonal arrangement is that the carbon fiber filament bundle band stretching on each face of base material is parallel to each other, the carbon fiber filament bundle band stretching on face of base material is mutually vertical with the carbon fiber filament bundle band stretching on another face at base material, form square grid, the carbon fiber filament bundle band stretching that described oblique is arranged as on each face of base material is parallel to each other, the angle of the carbon fiber filament bundle band stretching on the carbon fiber filament bundle band stretching on face of base material and another face at base material is acute angle, form rhombus grid.
5. electromagnetic shielding sheet as claimed in claim 1, it is characterized in that, the described carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching are arranged in parallel, orthogonal arrangement or oblique are arranged, described being arranged in parallel is parallel to each other for the carbon fiber filament bundle band existing with flexural wave form and at least carbon fiber filament bundle band stretching of one side that is distributed in base material, described orthogonal arrangement is that the carbon fiber filament bundle band existing with flexural wave form is parallel to each other, the at least carbon fiber filament bundle band stretching of one side that is distributed in base material is parallel to each other, the carbon fiber filament bundle band existing with flexural wave form is mutually vertical with the carbon fiber filament bundle band stretching at least simultaneously that is distributed in base material, form square grid, described oblique is arranged as straight carbon fiber filament bundle band and is parallel to each other, the carbon fiber filament bundle band that the flexural wave form of take exists is acute angle with at least angle of the carbon fiber filament bundle band stretching of one side that is distributed in base material, form rhombus grid.
6. the electromagnetic shielding sheet as described in any one in claim 2-5, it is characterized in that, the described carbon fiber filament bundle band stretching is stacked arrangement, and the two sides that described being stacked is arranged as at least one ribbon region of base material is all distributed with the carbon fiber filament bundle band stretching.
7. the electromagnetic shielding sheet as described in any one in claim 2-5, it is characterized in that, the described carbon fiber filament bundle band existing with flexural wave form and the carbon fiber filament bundle band stretching are inlayed arrangement, described inlaying be arranged as that at least a portion is not distributed with the carbon fiber filament bundle band existing with flexural wave form or the base material of the carbon fiber filament bundle band that stretches on the carbon fiber filament bundle band that is distributed with the carbon fiber filament bundle band stretching or exists with flexural wave form.
8. the electromagnetic shielding sheet as described in any one in claim 2-5, is characterized in that, described electromagnetic shielding sheet adopt alignment face-to-face laminated, in the face of back to neat laminated or rotate laminated mode and be combined with each other.
9. the preparation method of electromagnetic shielding sheet claimed in claim 1, it is characterized in that, comprise: on base material, make the carbon fiber filament bundle existing with flexural wave form and arrange the carbon fiber filament bundle stretching, at least one that makes the carbon fiber filament bundle existing with flexural wave form and the carbon fiber filament bundle stretching is ribbon and distributes, obtain single or multiple electromagnetic shielding sheets, a plurality of electromagnetic shielding sheets are combined with each other, obtain electromagnetic shielding sheet.
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| CN103465526A (en) * | 2013-09-18 | 2013-12-25 | 江南大学 | Flexible electromagnetic screen composite material |
| CN114206089A (en) * | 2021-10-25 | 2022-03-18 | 南京航天波平电子科技有限公司 | Preparation method of anti-infrared wave-absorbing grass wall |
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| CN101531804A (en) * | 2009-04-13 | 2009-09-16 | 天津大学 | Electromagnetic shielding compound material made from three-dimensional braided nickel-plated carbon fiber and epoxy resin and method for preparing same |
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| DE20221735U1 (en) * | 2002-10-22 | 2007-04-19 | Schumacher, Rolf | Warp knitted fabric with inserted weft yarn, e.g. for curtains, includes a conducting yarn in the main fabric or as inserted weft |
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| Title |
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| 《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2001-358497A 2001.12.26 |
| JP特开2002-111279A 2002.04.12 |
| 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), |
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