CN104774346A - Light porous wave absorbing film and preparing method thereof - Google Patents
Light porous wave absorbing film and preparing method thereof Download PDFInfo
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Abstract
The invention discloses a light porous wave absorbing film and a preparing method thereof. The light porous wave absorbing film comprises a fiber material with a fibrillation structure and a wave absorbing material, wherein the fiber material is of a three-dimensional cross-linked structure, the wave absorbing material is dispersed in the three-dimensional cross-linked structure, and the mass ratio of the wave absorbing material in the light porous wave absorbing film is 50-90%. The preparing method comprises the steps of dispersion, homogenization, filtration, baking and rolling. The wet papermaking technology is adopted, and the wave absorbing material is evenly distributed in a film-like wave absorbing body. According to the preparing method, the number of procedures is small, and cost is low. According to the prepared wave absorbing film, on the premise that wave absorbing capacity is maintained, the surface density of the wave absorbing body is lower than 2 kg/m<2>, and porosity is not lower than 30%.
Description
Technical field
The present invention relates to the absorption of electromagnetic radiation and shielding processing technology and associated materials, refer more particularly to a kind of preparation method and goods thereof of light porous suction ripple film.
Background technology
Along with the develop rapidly of electronic technology, the electromagnetic radiation be subject in people's daily life is on the increase; Simultaneously for adapting to the needs of modern war, stealth material is widely used in weapon, and therefore, the research of absorbing material has important practical value.China from the eighties in 20th century research to absorbing material and electromagnetic wave absorb, the middle and later periods nineties enters more comprehensive conceptual phase.Although the domestic research to absorbing material achieves good progress in some aspects, and defines the characteristic of oneself, its research emphasis is the research of certain absorbing material mostly, and the method for design research for cartridge is relatively less.Absorbing material can be divided into magneticmedium type, resistor-type and Electrolyte type material according to wear out mechanism.Wherein, resistor-type absorption agent mainly contains carbon fiber, silicon carbide, graphite etc.; Dielectric type absorption agent mainly contains SiC ceramic, barium titanate ceramics etc.; Magneticmedium type absorption agent mainly contains ferrite, super-fine metal powder, iron carbonyl etc.From current present Research, often kind of absorbing material has the absorbing property of its uniqueness, is applicable to the hertzian wave of different frequency range.But existing absorbing material also exists inhales the shortcomings such as ripple frequency range is narrower, and single-frequency absorbs, and quality is heavy, density is large.And stealthy technique to the composite request of absorbing material is: " thin, wide, light, strong ", therefore in order to meet the composite request of stealthy technique to absorbing material, development absorbs the development trend that strong, that bandwidth, density are little, thickness is thin, double frequency absorbs the even multifrequency absorption compatible good structural absorbing mater ials of frequency band will be following absorbing material.
Current suction ripple film is mainly broadly divided into two large classes: coating class and structure inhale ripple.It is adopt tackiness agent the powder body material with absorbing property to be coated in base material surface to inhale ripple layer to be formed that coating class inhales ripple film.Wave-absorbing powder mainly comprises graphite, ferrite, metal or alloy particulate, barium titanate, silicon carbide etc.It is base material with non-woven fabrics that Chinese patent CN1664960 discloses a kind of, coating aluminum-magnesium compositing powder and carbon black and the suction wave angle cone cell cube made.Chinese patent CN101139722 discloses a kind of absorbing membrane material of flexible winding, makes at flexible insulator plated surface last layer alloy film.Because Coating Durability is poor, the effectiveness that this method obtains can not be lasting, needs often to keep in repair again coating and just can obtain desirable wave-absorbing effect, consume a large amount of manpower and materials, cost is higher.
Fibrous texture absorbing material belongs to structural wave-absorbing material, refers in body material, form overall absorbent structure by having the fiber dispersion of inhaling wave energy.The fiber adopted mainly contains carbon fiber, steel fiber, silicon carbide fiber, alumina fiber etc., is wherein most widely used with carbon fiber and steel fiber.Carbon fiber belongs to semiconductor material, is easy to form resistance losses and dielectric loss, so have the performance of electromagnetic wave absorption at high-frequency alternating elect magnetic field.Chinese patent 1544723A discloses a kind of suction ripple composite nano fiber adopting the preparations such as polyacrylonitrile-based carbon, nanometer silicon carbide and nickel powder, and this fiber can be used for making inhales ripple woven combination.Steel fiber absorbing material normally adds steel fiber and obtains in fabric, as US Patent No. 6,521, the non-weaving suction wave material of metal fiber disclosed in 829, be containing a kind of laminating material containing wave-absorption fibre layer, but it is inhaled ripple and is limited in scope, and being only limitted to the frequency in daily life is that about 1GHz hertzian wave absorbs.
At present, the suction ripple film that prepared by above two kinds of methods is still faced with the too high (>2kg/m of area density
2), bendability is inadequate, thickness is too high problems such as (>1mm).How to prepare that a kind of voidage is adjustable with thickness, density is little, quality is light, suitable shape can be cut randomly into, frequency band compatibility is good and designability is strong structurizing inhales ripple film, meeting stealthy technique to the composite request inhaling ripple film, will be the focus of following absorbing material research.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of light porous suction ripple film, and have wave absorbing agent ratio high, physical strength is high, the feature that film thickness is controlled.
For solving the problems of the technologies described above, the present invention proposes a kind of light porous suction ripple film, comprise the fiber-like material and absorbing material with filtration structures, described fiber-like material is three-dimensional crosslinking structure, described absorbing material is dispersed in described three-dimensional crosslinking structure, and described in light porous suction ripple film, the quality accounting of absorbing material is 50-90%.Nano-fiber material plays the effect of mechanical support and bonding to membrane structure, and absorbing material plays the effect of suction ripple.
Described fiber-like material has relatively high original fiber degree and more dendritic structures, is preferably any one fiber or several of nano-cellulose, fibrillation polyethylene fibre, polypropylene fibre, polyacrylonitrile fibre, aramid fiber.
Preferably, described absorbing material is any one or a few particulate material in Fe-SiAl, ferrite, iron carbonyl, silicon carbide.The particle size range of described absorbing material is 0.01um-100um.Described absorbing material particle is Powdered or crystal whisker-shaped.
Light porous suction ripple film of the present invention, its porosity ranges is 20-80%, and area density rate scope is 0.5-2kg/m
2, thickness is 0.5-2mm.
More optimal, inhale ripple film to protect, the both sides of described light porous suction ripple film are respectively with not containing the fibrous protective layer of absorbing material.
The present invention proposes the preparation method of above-mentioned light porous suction ripple film simultaneously, different from using traditional binding agent, and the nanofiber that the present invention chooses height fibrillation is binding agent, under the help of solvent, reaches homodisperse state.The racemosus crystal structure that nanofiber shows to absorbing material particle formed tangles and is formed stablize, uniform slurry, eventually through vacuum filtration or high pressure filter pressing for film-like wave-absorber.Comprise the following steps:
Dispersion: a certain amount of fiber-like material with filtration structures is placed in solvent and carries out high-speed stirring, it is disperseed in the solution fully, the quality of described fiber-like material and the volume range of the solution required for dispersion are at 0.1mg/ml-5mg/ml;
Homogenizing: a certain amount of absorbing material is placed in scattered fiber solution, makes absorbing material disperse fully in the solution through stirring; Fiber-like material plays the effect of supporting structure, and the dispersed three-dimensional crosslinking structure formed afterwards in a solvent makes whole slurry evenly not precipitate simultaneously, thus ensure that the even of finished product entirety, and forms high porosity.
Filter: the solution prepared is proceeded in strainer, by the mode of vacuum filtration or high pressure press filtration by solid-liquid separation;
Baking: solvent composition remaining in mould material is removed by vacuum bakeout or Air drying by the diaphragm filtered;
Compressing tablet: by the diaphragm roll-in after baking, obtains the light porous suction ripple film of even curface and desired thickness.
Described solvent is selected from one or more in Virahol, dehydrated alcohol, propyl carbinol, n-propyl alcohol, deionized water.
The present invention has following characteristics:
One, selection range is wide: with absorbing material, no matter be ferrite, the wave absorbing agent of iron carbonyl, Fe-Si-Al or other types can be applied in the invention, and the size range of particle is larger: 0.01um-100um; For filamentary material, except nano-cellulose, fibrillation polyethylene fibre, any one fibers such as polypropylene fibre, polyacrylonitrile fibre, aramid fiber can also be used; Solvent can use Virahol, may also be and uses dehydrated alcohol, propyl carbinol, propyl carbinol or more cheap deionized water etc.
Two, wave absorbing agent is uniformly dispersed: the supporting role of the dispersed main dependence nanofiber of wave absorbing agent particle.Nanofiber realizes sufficient dispersion in a solvent by high-speed stirring shearing action, ensure that absorbing material does not produce sedimentation in a solvent before film forming, there will not be agglomeration after film forming.
Three, prepare quick proper scale: absorbing material passes through high-speed stirring in a solvent can reach dispersion effect.Vacuum filtration and high pressure press filtration are all can the technique of industrialization on a large scale.
Four, filter membrane can carry out secondary processing and use different application target to reach, as the thickness of product, snappiness and mechanical strength etc.
Five, the present invention adopts wet papermaking process, and absorbing material is evenly distributed in membranaceous wave-absorber.This preparation method's operation is few, cost is low, and the suction ripple film of preparation is under the prerequisite reaching identical suction ripple usefulness, and wave-absorber area density is lower than 2kg/m
2, porosity is not less than 30%.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is further described in detail.
Fig. 1 is area density is 0.5kg/m
2, wave absorbing agent account for total mass ratio be 75% lightweight inhale the suction ripple test curve figure of ripple film.
Fig. 2 is prepared use Mierocrystalline cellulose interlayer protection middle suction ripple film, is area density 0.36kg/m in the middle of it
2suction ripple film, the ratio of wave absorbing agent is 70%, and two sides respectively has area density to be 0.02kg/m
2the suction ripple test pattern of nano-cellulose interlayer.
Fig. 3 be containing the iron carbonyl of 75%, the nano-cellulose of 15% and 10% the cross section Electronic Speculum figure of suction ripple film of fibrillation polyethylene fibre.
Embodiment
The principle of this invention is: the nanofiber with height fibrillation is dispersed in a certain amount of solvent, and forms tridimensional network.Original fiber degree is higher, and three-dimensional netted entanglement capability is stronger.Nanofiber forms well stable entanglement to Powdered absorbing material, thus after removal solvent composition, forms the same porous of similar paper and inhale ripple film.Inhaling ripple film can roll-in further, reduces the thickness inhaling ripple film, and improves the mechanical strength of suction ripple film.
Its general operation comprises: dispersion, homogenizing, filtration, baking, roll-in, and embodiment is:
Dispersion: nano-cellulose fiber, polyethylene fibre, polyvinyl alcohol fiber, polyacrylonitrile fibre, aramid fiber or said mixture are carried out high-speed stirring dispersion in a certain amount of solvent, and the volume ratio scope of the quality of the filamentary material used and the solvent of use is 0.1mg/ml-5mg/ml.Nanofiber original fiber degree is higher, has many dendrite morphologies.Dendrite, in nanometer range, is formed wave absorbing agent particle and tangles, and simultaneously between dendrite, crosslinked action widely provides mechanical support effect for film body.Nanofiber is proportion 10%-50% in wave-absorber mould material.Solvent can be water, Virahol, dehydrated alcohol, propyl carbinol, n-propyl alcohol and other lower molecular weight organic solvents, or above-mentioned mixed solvent, requires solvent good fluidity.The solvent that viscosity is large can affect dispersed homogeneous degree and filtration velocity.
Twice dispersing: wave absorbing agent powder body material is put into scattered fiber solution, uses the mode of high-speed stirring to carry out homogenizing dispersion, wave absorbing agent is contacted fully with filamentary material in the solution.In this process, the dendrite of filamentary material will form entanglement to powder granule.Wave absorbing agent can be any one or a few absorbing materials such as Fe-Si-Al powder, ferrite, iron carbonyl, silicon carbide, and particle size can be selected in a big way: 0.01um-100um.Absorbing material consumption accounts for the interior adjustment of 50%-90% scope of inhaling ripple film quality.Along with the increase of absorbing material usage ratio, the mechanical property of inhaling ripple film has the trend of reduction.
Filter: the mode using vacuum filtration or high pressure press filtration, solvent composition is detached recovery, and recovered solvent directly can carry out secondary use.Wave-absorbing powder in solution and fiber will be left on filter paper.The mode film forming speed of vacuum filtration or high pressure press filtration is fast.
Dry: the suction ripple film after filtration is transferred in baking box, and the mode of baking can select common oven dry and flash baking.By leaving standstill, the solvent composition remained fully is volatilized under common oven dry and normal temperature and pressure; Flash baking comprises: constant-pressure and high-temperature baking 45-150 DEG C, or low pressure quick baking ,-0.085MPa, 40-150 DEG C.After drying, inhaling ripple film can easily from substrate transfer, and the wave-absorber film integrality after transfer is unaffected.
Roll-in: the wave-absorber film after general oven dry has relatively little density and larger thickness.Diaphragm inside can be made to compact by roll-in, smooth surface, obtain higher mechanical strength, and reduce thickness, and adjustment apertures rate.
Example 1
Fe-Si-Al powder and nano-cellulose mass ratio are 75:25, and the suction ripple face density of preparation is 0.4kg/m
2.Nano-cellulose carries out sufficient dispersed with stirring in Virahol, nano-cellulose quality with use the volume ratio of Virahol for 1mg/ml; Absorbing material adds in scattered nanofiber cellulose solution, carries out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration; Under being positioned over normal temperature and pressure conditions after filtration completes, the Virahol of film body internal residual is volatilized naturally.Inhale ripple film can shift from filtering membrane easily after the drying.The lightweight obtained inhales the suction ripple test curve of ripple film as shown in Figure 1.After tested, can to being that 8--12GHz hertzian wave effectively absorbs to frequency, its porosity is 50%.Tensile strength reaches 5MPa.
Example 2
Fe-Si-Al powder and fibrillation polyethylene fibre mass ratio are 90:10, and being prepared into suction ripple face density is 0.8kg/m
2, fibrillation polyethylene fibre carries out sufficient dispersed with stirring in dehydrated alcohol, fibrillation polyethylene fibre quality with use the volume ratio of Virahol for 1mg/ml; Absorbing material adds in scattered fibrillation polyethylene fibre solution, carries out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out high pressure press filtration; Press filtration completes and is placed on 120 DEG C of vacuum drying ovens oven dry.Inhale ripple film can shift from filtering membrane easily after the drying.After tested, can to being that 6--14GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 7MPa.
Example 3
Fe-Si-Al powder and nano-cellulose and fibrillation polyethylene fibre mass ratio are 75:15:10, are prepared into that to inhale ripple face density be 1.6kg/m
2, nano-cellulose and fibrillation polyethylene fibre carry out sufficient dispersed with stirring in water, nano-cellulose and fibrillation polyethylene quality with use the volume ratio of Virahol to be respectively 0.25mg/ml; Wave absorbing agent adds in scattered nano-cellulose and fibrillation polyethylene fibre solution, carries out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration; Under the first finished product of filtration is positioned over normal temperature and pressure conditions, the Virahol of film body internal residual is volatilized naturally.Wave-absorber film can shift from filtering membrane after the drying easily.The cross section Electronic Speculum figure of the suction ripple film obtained as shown in Figure 3.After tested, can to being that 2--8GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 10MPa.
Example 4
Carbonyl iron dust and fibrillation aramid fiber mass ratio are 90:10, and the suction ripple face density of plan preparation is 2kg/m
2, nano-cellulose carries out sufficient dispersed with stirring in Virahol and ethanol (1:1), fibrillation aramid fiber quality with use the volume ratio of Virahol and ethanol for 0.5mg/ml; Carbonyl iron dust adds in scattered nanofiber cellulose solution, carries out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration; Under the first finished product of filtration is positioned over 80 degree of vacuum conditions, the Virahol of film body internal residual is volatilized.Wave-absorber film can shift from filtering membrane after the drying easily.After tested, can to being that 6--15GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 2MPa.
Example 5
Carbonyl iron dust and Fe-Si-Al powder and nano-cellulose mass ratio are 50:40:10, are prepared into that to inhale ripple face density be 1kg/m
2, nano-cellulose carries out sufficient dispersed with stirring in propyl carbinol, nano-cellulose quality with use the volume ratio of Virahol for 5mg/ml; Carbonyl iron dust and Fe-Si-Al powder add in scattered nanofiber cellulose solution, carry out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out high pressure press filtration; Under the first finished product of filtration is positioned over normal temperature and pressure conditions, the propyl carbinol of film body internal residual is volatilized naturally.Wave-absorber film can shift from filtering membrane after the drying easily.Dry complete suction ripple film, 150 DEG C of roll-ins, makes film body material inside finer and close, and thickness is reduced to 1.3 millimeters from 1.7 millimeters.After tested, can to being that 2--18GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 1MPa.
Example 6
Carbonyl iron dust and silicon carbide fiber and nano-cellulose, polyethylene fibre, aramid fiber, polyacrylonitrile fibre mass ratio are 60:30:2:3:2:3, and the suction ripple face density of plan preparation is 2kg/m
2, above-mentioned blend fiber carries out sufficient dispersed with stirring in Virahol, blend fiber quality with use the volume ratio of Virahol for 3mg/ml; Carbonyl iron dust and silicon carbide fiber add in scattered blend fiber solution, carry out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration; Under the first finished product of filtration is positioned over normal temperature and pressure conditions, the Virahol of film body internal residual is volatilized naturally.Wave-absorber film can shift from filtering membrane after the drying easily.Dry complete suction ripple film, in room temperature roll-in, makes film body material inside finer and close, and thickness is reduced to 0.5 millimeter from 1.7 millimeters.After tested, can to being that 2--18GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 9MPa.
Example 7
Carbonyl iron dust, silicon carbide fiber, carbon nano-tube fibre, fibrillation polyethylene fibre, nano-cellulose mass ratio are 30:30:10:20:10, and the suction ripple face density of plan preparation is 1.6kg/m
2, polyethylene fiber peacekeeping nano-cellulose carries out sufficient dispersed with stirring in deionized water, nano-cellulose and fibrillation polyethylene fibre quality with use the volume ratio of Virahol for 5mg/ml; Carbonyl iron dust, silicon carbide fiber, carbon nano-tube fibre add in scattered nano-cellulose and fibrillation polyethylene fibre solution, carry out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out high pressure press filtration; Under the first finished product of filtration is positioned over normal temperature and vacuum conditions, make the solvent evaporates of film body internal residual.Wave-absorber film can shift from filtering membrane after the drying easily.Dry complete suction ripple film, 120 DEG C of roll-ins, makes film body material inside finer and close, and thickness is reduced to 1 millimeter from 1.7 millimeters.After tested, can to being that 2--18GHz hertzian wave effectively absorbs to frequency, its porosity is 50%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 13MPa.
Example 8
Carbonyl iron dust, silicon carbide fiber, carbon nano-tube fibre, fibrillation polyethylene fibre, nano-cellulose mass ratio are 30:30:10:20:10, and the suction ripple face density of plan preparation is 2kg/m
2polyethylene fiber peacekeeping nano-cellulose (polyethylene fiber peacekeeping nano-cellulose mass ratio 2:1) carries out sufficient dispersed with stirring in deionized water, nano-cellulose and fibrillation polyethylene fibre quality with use the volume ratio of deionized water for 5mg/ml; Carbonyl iron dust, silicon carbide fiber, carbon nano-tube fibre add in scattered nano-cellulose and fibrillation polyethylene fibre solution, carry out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration; Under the first finished product of filtration is positioned over normal temperature and vacuum conditions, make the solvent evaporates of film body internal residual.Wave-absorber film can shift from filtering membrane after the drying easily.Dry complete suction ripple film, 90 DEG C of roll-ins, makes film body material inside finer and close, and thickness is reduced to 1.3 millimeters from 1.7 millimeters.After tested, can to being that 2--18GHz hertzian wave effectively absorbs to frequency, its porosity is 60%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 10MPa.
Example 9
With 0.02kg/m
2area density prepare the nano-cellulose dispersion liquid of respective quality, filter in advance and form one deck cellulose membrane.Press carbonyl iron dust and nano-cellulose mass ratio 70:30 afterwards, the suction ripple face density of preparation is 0.36kg/m
2, nano-cellulose carries out sufficient dispersed with stirring in Virahol, nano-cellulose quality with use the volume ratio of Virahol for 0.5mg/ml; Carbonyl iron dust adds in scattered nanofiber cellulose solution, carries out secondary stirring to reach overall homogenizing; Proceed to afterwards in strainer and carry out vacuum filtration.On the suction ripple film filtered, one deck cellulose layer of same area density is filtered afterwards by the condition that pre-suction filtration nano-cellulose layer is the same.Filter under just finished product is positioned over 100 ° of vacuum conditions and carry out rapid drying.Wave-absorber film can shift from filtering membrane after the drying easily.Dry complete suction ripple film, 90 DEG C of roll-ins, makes film body material inside finer and close, and thickness is reduced to 1 millimeter from 1.7 millimeters.The suction ripple test pattern of the suction ripple film of the band protective layer of gained as shown in Figure 2.After tested, can to being that 8--12GHz hertzian wave effectively absorbs to frequency, its porosity is 55%, and wave-absorber area density is lower than 2kg/m
2.Tensile strength reaches 25MPa.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a light porous suction ripple film, it is characterized in that, comprise the fiber-like material and absorbing material with filtration structures, described fiber-like material is three-dimensional crosslinking structure, described absorbing material is dispersed in described three-dimensional crosslinking structure, and described in light porous suction ripple film, the quality accounting of absorbing material is 50-90%.
2. light porous suction ripple film according to claim 1, is characterized in that, described fiber-like material is any one fiber or several of nano-cellulose, fibrillation polyethylene fibre, polypropylene fibre, polyacrylonitrile fibre, aramid fiber.
3. light porous suction ripple film according to claim 1, is characterized in that, described absorbing material is any one or a few particulate material in Fe-SiAl, ferrite, iron carbonyl, silicon carbide.
4. light porous suction ripple film according to claim 3, is characterized in that, the particle size range of described absorbing material is 0.01um-100um.
5. light porous suction ripple film according to claim 3, it is characterized in that, described absorbing material particle is Powdered or crystal whisker-shaped.
6. light porous suction ripple film according to claim 1 and 2, it is characterized in that, its porosity ranges is 20-80%, and area density rate scope is 0.5-2kg/m
2, thickness is 0.5-2mm.
7. light porous suction ripple film according to claim 3, is characterized in that, the both sides of described light porous suction ripple film are attached to respectively not containing the fibrous protective layer of absorbing material.
8. a preparation method for light porous suction ripple film described in claim 1, is characterized in that, comprise the following steps:
Dispersion: a certain amount of fiber-like material with filtration structures is placed in solvent and carries out high-speed stirring, it is disperseed in the solution fully, the quality of described fiber-like material and the volume range of the solution required for dispersion are at 0.1mg/ml-5mg/ml;
Homogenizing: a certain amount of absorbing material is placed in scattered fiber solution, makes absorbing material disperse fully in the solution through stirring;
Filter: the solution prepared is proceeded in strainer, by the mode of vacuum filtration or high pressure press filtration by solid-liquid separation;
Baking: solvent composition remaining in mould material is removed by vacuum bakeout or Air drying by the diaphragm filtered;
Compressing tablet: by the diaphragm roll-in after baking, obtains the light porous suction ripple film of even curface and desired thickness.
9. according to Claim 8 described in the preparation method of light porous suction ripple film, it is characterized in that, described solvent is selected from one or more in Virahol, dehydrated alcohol, propyl carbinol, n-propyl alcohol, deionized water.
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