CN117604807A - High-strength wave-absorbing paper and preparation method and application thereof - Google Patents
High-strength wave-absorbing paper and preparation method and application thereof Download PDFInfo
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- CN117604807A CN117604807A CN202311829670.XA CN202311829670A CN117604807A CN 117604807 A CN117604807 A CN 117604807A CN 202311829670 A CN202311829670 A CN 202311829670A CN 117604807 A CN117604807 A CN 117604807A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000003365 glass fiber Substances 0.000 claims abstract description 113
- 239000006096 absorbing agent Substances 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000011259 mixed solution Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000004513 sizing Methods 0.000 claims abstract description 17
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000000967 suction filtration Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000000123 paper Substances 0.000 claims description 147
- 239000000835 fiber Substances 0.000 claims description 40
- 239000002250 absorbent Substances 0.000 claims description 28
- 230000002745 absorbent Effects 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 230000009172 bursting Effects 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 239000011086 glassine Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 20
- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical compound O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 description 10
- 239000011358 absorbing material Substances 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- LBFUKZWYPLNNJC-UHFFFAOYSA-N cobalt(ii,iii) oxide Chemical compound [Co]=O.O=[Co]O[Co]=O LBFUKZWYPLNNJC-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/005—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using woven or wound filaments; impregnated nets or clothes
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Paper (AREA)
Abstract
The invention relates to high-strength wave-absorbing paper, and a preparation method and application thereof. The method comprises the following steps: uniformly dispersing glass fibers and water to obtain slurry; forming the glass fiber paper from the obtained slurry to obtain formed glass fiber paper; mixing the wave absorber powder with water, and uniformly stirring to obtain a mixed solution; pouring the obtained mixed solution on the obtained formed glass fiber paper for suction filtration, so that the wave absorber powder is distributed in the glass fiber paper to obtain wave absorber composite glass fiber paper; and (3) sizing the obtained wave absorber composite glass fiber paper, compositing the wave absorber composite glass fiber paper with PET non-woven fabrics, and drying to obtain the high-strength wave absorber paper. In the preparation process, the distribution of the wave absorber powder is regulated according to the pore distribution condition of the glass fiber paper, so that the wave absorbing performance such as impedance matching and reflection loss is regulated. The preparation method is simple and low in cost, and the prepared wave-absorbing paper has the properties of resisting harsh environments and absorbing electromagnetic waves.
Description
Technical Field
The invention relates to the technical field of glass fiber materials, in particular to high-strength wave-absorbing paper and a preparation method and application thereof.
Background
The wave absorbing material is one of key materials in national defense and civil fields such as military stealth, microwave communication, electromagnetic radiation protection and the like. According to different molding processes, the method can be divided into a coating type wave-absorbing material and a structural wave-absorbing material. The coated wave absorbing material is formed by mixing wave absorbing agents such as metal powder, alloy powder, carbon powder, ceramic powder, ferrite, conductive polymer or modified powder, composite powder and the like with a binder and then coating the mixture on the target surface. However, the coated wave-absorbing material has a series of problems of single function, poor thermal stability, easy falling and the like, can not meet the design requirement of the wave-absorbing performance for both appearance and appearance, and limits the wide use of the wave-absorbing material in weaponry and civil production. The film covered wave-absorbing material can be suitable for various shaped objects in various scenes, but the film wave-absorbing material at the present stage has complex preparation, low mechanical strength, and the wave-absorbing agent powder is not easy to disperse in the preparation process, and the preparation of the film is limited to research in a laboratory at present and cannot be applied to production.
Disclosure of Invention
In view of the above, the main purpose of the invention is to provide a high-strength wave-absorbing paper, and a preparation method and application thereof, and the technical problem to be solved is to skillfully and uniformly distribute wave-absorbing agents in a gradient manner by utilizing a filtering interception principle, so that the wave-absorbing paper has the advantages of controllable impedance matching, adjustable wave-absorbing performance and high strength.
The aim and the technical problems of the invention are realized by adopting the following technical proposal. The invention provides a preparation method of high-strength wave-absorbing paper, which comprises the following steps:
s1, uniformly dispersing glass fibers and water to obtain slurry;
s2, forming glass fiber paper from the slurry obtained in the step S1 to obtain formed glass fiber paper;
s3, mixing the wave absorber powder with water, and uniformly stirring to obtain a mixed solution;
s4, pouring the mixed solution obtained in the step S3 into the formed glass fiber paper obtained in the step 2) for suction filtration, so that the wave-absorbing agent powder is distributed in the glass fiber paper to obtain wave-absorbing agent composite glass fiber paper;
and S5, sizing the wave-absorbing agent composite glass fiber paper obtained in the step S4, compositing the wave-absorbing agent composite glass fiber paper with PET non-woven fabrics, and drying the composite glass fiber paper to obtain the high-strength wave-absorbing paper.
Preferably, in the method for preparing high-strength absorbent paper, in step S1, the mass ratio of the glass fiber to water is (1-80): 10000; the fiber is at least one selected from glass fiber, quartz fiber, ceramic fiber and organic fiber, and the wire diameter is less than or equal to 20 μm.
Preferably, in the method for producing high-strength absorbent paper, in the step S1, the fibers are at least two fibers selected from glass fibers, quartz fibers, ceramic fibers and organic fibers, and the filament diameter thereof is less than or equal to 20 μm.
Preferably, in the method for producing high-strength absorbent paper, in step S1, the filament diameters of at least two fibers are the same or different.
Preferably, in the method for preparing high-strength absorbent paper, in step S2, a step of drying is further included after the step of forming the glass fiber paper, and the drying temperature is 80-120 ℃.
Preferably, in the method for preparing high-strength wave-absorbing paper, in the step S2, the method further includes steps of compounding, squeezing and drying at least two kinds of molded glass fiber paper after the glass fiber paper molding step; the load of the pressing is 5-80N; the drying temperature is 80-120 ℃.
Preferably, in the method for preparing high-strength wave-absorbing paper, in step S3, the wave-absorbing agent powder is conductive, magnetically permeable powder or fiber selected from graphite powder, graphene, moS 2 At least one of MXene, ferrite, iron powder, cobalt powder and nickel powder.
Preferably, in the method for preparing high-strength absorbent paper, in step S3, the concentration of the absorbent in the mixed solution is 0.001-30g/L; the mass ratio of the glass fiber to the wave absorber is 1:50-200:1.
Preferably, in the method for preparing high-strength absorbent paper, in step S5, the glue solution used for sizing is a thermosetting or thermoplastic high-molecular polymer, and the temperature resistance is higher than 150 ℃; the non-woven fabric is 15-40g/m 2 Is a PET nonwoven fabric of (C).
Preferably, in the method for preparing high-strength absorbent paper, in step S5, the sizing method includes one of spraying, suction filtration, soaking and suction filtration.
Preferably, in the method for preparing high-strength absorbent paper, in step S5, the sizing amount is 2wt% to 15wt%.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures. The invention provides a preparation method of high-strength wave-absorbing paper, which is single-layer or multi-layer gradient, wherein the thickness of the high-strength wave-absorbing paper is 0.20-0.70 mm, the bursting strength is more than or equal to 300kPa, and the average reflection loss value between 2 GHz and 18GHz is lower than-10 dB.
Preferably, in the foregoing high-strength wave-absorbing paper, the high-strength wave-absorbing paper is produced by the above method.
The aim and the technical problems of the invention can be further realized by adopting the following technical measures. The invention provides an isolation stealth material, which adopts the high-strength wave-absorbing paper.
By means of the technical scheme, the high-strength wave-absorbing paper provided by the invention and the preparation method and application thereof have at least the following advantages:
according to the high-strength wave-absorbing paper, the wave-absorbing paper with the pore sizes distributed in a gradient mode is constructed by adjusting the fiber diameters, wave-absorbing agent powder with different shapes and different particle sizes can be naturally distributed in a gradient mode by utilizing a filtering interception mechanism, and the wave-absorbing paper is prepared through processes such as adhesive curing, so that the wave-absorbing paper is resistant to severe environments, adjustable and excellent in wave-absorbing performance.
The high-strength wave-absorbing paper disclosed by the invention skillfully distributes wave-absorbing agents uniformly and in a gradient manner by utilizing a filtering interception principle, and realizes the controllability of impedance matching, reflection loss and the like of a film material.
The preparation method of the high-strength wave-absorbing paper is simple and low in cost, and the prepared wave-absorbing paper has the properties of resisting severe environments and absorbing electromagnetic waves.
The high-strength wave-absorbing paper has the thickness of 0.20-0.70 mm, the bursting strength of 300kPa or more and the average reflection loss value between 2 GHz and 18GHz of less than-10 dB.
The foregoing description is only an overview of the present invention, and is intended to provide a more thorough understanding of the present invention, and is to be accorded the full scope of the present invention.
Drawings
FIG. 1 is a flow chart of the preparation of the high strength absorbent paper of the present invention;
FIG. 2 is a photograph of a high strength absorbent paper prepared in example 1 of the present invention;
fig. 3 is a cross-sectional SEM image of the high-strength absorbent paper prepared in example 3 of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following is a detailed description of a specific implementation, structure, characteristics and effects of the high-strength wave-absorbing paper, a preparation method and application thereof according to the invention in combination with the preferred embodiment. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless otherwise indicated, materials, reagents, and the like referred to below are commercially available products well known to those skilled in the art; unless otherwise indicated, the methods are all methods well known in the art. Unless otherwise defined, technical or scientific terms used should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The following operations or conditions of conventional experimental procedures described in the literature in this field may be performed without reference to specific experimental procedures or conditions.
As shown in fig. 1, some embodiments of the present invention provide a method for preparing high-strength wave absorbing paper, which includes the following steps:
1) Putting glass fiber and water into a dissociation stirrer to be uniformly dispersed to obtain slurry; the glass fibers can be of the same wire diameter, or of the same fiber or different fiber with different wire diameters; the fiber diameter of the glass fiber is 0.05-30 mu m, and if the fiber diameter is larger than 30 mu m, the fiber is too thick and can not intercept the wave absorber. When the particle size is less than 0.05 mu m, the glass fiber paper has poor air permeability, so that the wave absorber powder is not easy to disperse and aggregate. The fibers are selected from at least one of glass fibers, quartz fibers, ceramic fibers, organic fibers, etc., and the fibers can be of various types. Further, the fibers may be selected from at least two of glass fibers, quartz fibers, ceramic fibers, and organic fibers. The mass ratio of the glass fiber to the water is (1-80): 10000; if the mass ratio of the two is less than 1:10000, the concentration is too low to form continuous glass fiber paper; if the mass ratio of the two is more than 8:1000, the concentration is too high, so that glass fibers are accumulated.
2) Forming glass fiber paper from the slurry obtained in the step S1 to obtain formed glass fiber paper; the glassine forming may be performed on a straight wire, inclined wire, or laboratory sheet machine, such as a wet forming machine. The method also comprises a drying step after the glass fiber paper forming step or a step of compounding, squeezing and drying at least two formed glass fiber papers after the glass fiber paper forming step, wherein the drying temperature is set to be 80-120 ℃. If the temperature is lower than 80 ℃, the drying time is increased due to the fact that the temperature is too low; if the temperature is higher than 120 ℃, the energy is wasted due to the fact that the temperature is too high. The load of the press can be set to be 5-80N, and when the load is greater than 80N, the pressure is too high, so that glass fibers are easy to damage; when the load is less than 5N, the pressure is too small to effectively extrude the moisture.
3) Mixing the wave absorber powder with water, and stirring uniformly to obtain a mixed solution for later use; the wave absorber powder is conductive, magnetic conductive powder or fiber, including but not limited to graphite powder, graphene, moS 2 MXene, ferrite, iron powder, cobalt powder, nickel powder, etc., or a mixed powder thereof. The concentration of the wave absorbing agent in the mixed solution is 0.001-30g/L, the concentration of the mixed solution is regulated according to the densities of different wave absorbing agents, and when the concentration is less than 0.001g/L, the filtration interception time can be increased due to the fact that the concentration is too small; when the concentration is more than 30g/L, the excessive concentration is unfavorable for uniform dispersion of the wave absorbing agent. Considering that the wave absorber not only comprises metal powder with higher density, but also comprises single-layer graphene with lower density and the like, the mass ratio of the glass fiber to the wave absorber can be set to be 1:50-200:1; if the mass ratio of the two is lower than 1:50, the impedance of the material is not matched, and electromagnetic waves cannot enter the material; if the ratio of the two is higher than 200:1, the electromagnetic wave can not be absorbed by the electromagnetic wave transmitting material. Therefore, the mass ratio of the glass fiber to the wave absorber is preferably 1:10-100:1, so that the material can be subjected to impedance matching after the glass fiber is preferably selected, electromagnetic waves can enter the material, and electromagnetic wave loss is carried out through the wave absorber distributed in the material, so that a better wave absorbing effect is achieved.
4) Placing the formed glass fiber paper obtained in the step 2) into a suction filter funnel, taking the mixed liquid obtained in the step 4) according to the size of a suction filter device, and performing suction filtration to ensure that the wave absorber powder is distributed in the glass fiber paper to obtain wave absorber composite glass fiber paper; the cobalt oxide and the like are intercepted in the glass fiber paper by a filtering method, so that the control of the size of the holes can be realized by utilizing the different coarse and fine fiber proportions of the glass fiber paper, and the uniform or gradient distribution of the wave absorber powder can be realized by intercepting different wave absorbers.
5) And (3) compositing the wave-absorbing agent composite glass fiber paper obtained in the step (4) with non-woven fabrics, sizing, and drying at 100-180 ℃ to obtain the high-strength wave-absorbing paper. The drying temperature of 100℃to 180℃is chosen mainly in view of the nature of the adhesive. Considering the curing temperature, the glue solution used for sizing is a thermosetting or thermoplastic high molecular polymer, and the temperature resistance requirement is higher than 150 ℃; for example, the glue may be a water-soluble resin adhesive or the like. The non-woven fabric is 20-40g/m 2 Is a PET nonwoven fabric of (C). If the gram weight is less than 20g/m 2 If the non-woven fabric is too thin, the non-woven fabric is easy to deform in the preparation process, so that the paper is uneven in folds; if the gram weight is greater than 40g/m 2 The non-woven fabric is too thick and has poor air permeability, so that the paper forming is not facilitated. The sizing method comprises one of spraying, suction filtration or soaking and suction filtration, and the sizing amount is controlled between 2wt% and 15wt% by controlling the concentration of the adhesive and the sizing time; if the sizing amount is less than 2wt%, the adhesive is too small, so that the strength of the absorbent paper is low; if the sizing amount is more than 15wt%, too high a sizing amount results in a material having a high hardness and poor workability.
The high-strength absorbent paper refers to absorbent paper having a bursting strength of 300kPa or more.
Some embodiments of the present invention also provide a high-strength wave-absorbing paper having a thickness of 0.20mm to 0.70mm, a burst of 300kPa or more, and an average reflection loss value between 2 and 18GHz of less than-10 dB; the high-strength wave-absorbing paper is prepared by the method.
Some embodiments of the present invention also provide an insulating stealth material that employs the aforementioned high strength wave absorbing paper. The isolated stealth material can be used for building and war chariot stealth coverage in the military field; building or electronic equipment device for preventing electromagnetic wave interference in civil field. In order to improve the service life and the tooling requirement, the thickness of the high-strength wave-absorbing paper is 0.20-0.70 mm, the bursting strength is more than or equal to 300kPa, and the average reflection loss value between 2 GHz and 18GHz is lower than-10 dB.
The invention is further illustrated below with reference to specific examples.
Example 1
The embodiment provides a preparation method of high-strength wave-absorbing paper, which comprises the following steps:
1) 3g of alkali-free glass fiber with the wire diameter of 2 mu m is mixed with 6L of water and uniformly dispersed to obtain slurry;
2) Molding the slurry obtained in the step 1) on a papermaking machine to obtain molded glass fiber paper; squeezing the obtained molded glass fiber paper by 20N, and then drying the molded glass fiber paper in a drying box at 100 ℃ for 2min to obtain glass fiber paper;
3) Mixing 0.1g graphite powder (particle size of 0.5 μm) and 1g cobalt oxide powder (particle size of 0.3 μm) with 1.1L water, and stirring to obtain mixed solution;
4) Placing the glass fiber paper obtained in the step 2) into a suction filter funnel; taking out 200ml of the mixed solution obtained in the step 3), pouring the mixed solution into a 500ml suction filter funnel, and performing suction filtration to uniformly distribute the wave-absorbing agent powder in the glass fiber paper to obtain wave-absorbing agent composite glass fiber paper;
5) Mixing the wave absorbing agent composite glass fiber paper obtained in the step 4) with 20g/m 2 The PET non-woven fabric of the (C) is compounded and impregnated with a water-soluble resin adhesive, and then is dried at 150 ℃ for 30min, so that the high-strength wave-absorbing paper is obtained.
The high-strength wave-absorbing paper described above was photographed as shown in fig. 2. As can be seen from fig. 2, the glass fibers with different thicknesses are built with different pore diameters, the pore diameters are distributed in a gradient from top to bottom, and the glass fiber paper with different pore diameters intercepts the wave absorber powder inside and the wave absorber powder is distributed in a gradient from top to bottom along with the pore diameter distribution of the glass fiber paper.
Example 2
The embodiment provides a preparation method of high-strength wave-absorbing paper, which comprises the following steps:
1) 3g of alkali-free glass fiber with a wire diameter of 3 mu m and 1g of alkali-free glass fiber with a wire diameter of 1 mu m are mixed with 8L of water, and the mixture is uniformly dispersed to obtain slurry;
2) Molding the slurry obtained in the step 1) on a papermaking machine to obtain molded glass fiber paper; squeezing the obtained molded glass fiber paper by 20N, and then drying the molded glass fiber paper in a drying box at 100 ℃ for 2min to obtain glass fiber paper;
3) Mixing 0.05g MXene (particle size of 0.5 μm) and 1g cobalt oxide powder (particle size of 0.3 μm) with 2.1L water, and stirring to obtain mixed solution;
4) Placing the glass fiber paper obtained in the step 2) into a suction filter funnel; taking out 200ml of the mixed solution obtained in the step 3), pouring the mixed solution into a 500ml suction filter funnel, and performing suction filtration to ensure that the wave-absorbing agent powder is distributed in the glass fiber paper to obtain wave-absorbing agent composite glass fiber paper;
5) Mixing the wave absorbing agent composite glass fiber paper obtained in the step 4) with 20g/m 2 The PET non-woven fabric of the (C) is compounded and impregnated with a water-soluble resin adhesive, and then is dried at 150 ℃ for 30min, so that the high-strength wave-absorbing paper is obtained.
Example 3
The embodiment provides a preparation method of high-strength wave-absorbing paper, which comprises the following steps:
1) Mixing 2g of alkali-free glass fiber with a wire diameter of 5 mu m with 4L of water, uniformly dispersing to obtain first slurry, and then forming the obtained first slurry on a sheet-making paper machine to obtain first formed glass fiber paper;
2) Mixing 2g of alkali-free glass fiber with a wire diameter of 2 mu m with 4L of water, uniformly dispersing to obtain second slurry, and then forming the obtained second slurry on a sheet-making paper machine to obtain second formed glass fiber paper;
3) Compounding the first molded glass fiber paper obtained in the step 1) with the second molded glass fiber paper obtained in the step 2), squeezing for 20N, and drying in a drying box at 100 ℃ for 2min to obtain double-layer gradient molded glass fiber paper;
4) Mixing 0.1g of MXene (particle size of 0.5 μm) and 1g of cobalt oxide powder (particle size of 0.3 μm) with 1.1L of water, and stirring to obtain a mixed solution for later use;
5) Placing the double-layer gradient formed glass fiber paper obtained in the step 3) into a suction filter funnel; taking 200mL of the mixed solution obtained in the step 4), pouring the mixed solution into a 500mL suction filter funnel, and performing suction filtration to ensure that wave-absorbing agent powder is distributed in the double-layer gradient molding glass fiber paper to obtain wave-absorbing agent composite glass fiber paper;
6) Mixing the wave absorbing agent composite glass fiber paper obtained in the step 5) with 20g/m 2 The PET non-woven fabric of (2) is compounded and impregnated with a water-soluble resin adhesive, and then is dried at 150 ℃ for 30min to obtain the high-strength wave-absorbing paper, which is shown in figure 3. As can be seen from the microscopic morphology diagram of the section of the layered gradient glass fiber paper in FIG. 3, the upper layer glass fiber is built into a sparse structure, the aperture is larger, the lower layer glass fiber is built into a dense structure, the aperture is smaller, the whole of the glass fiber paper shows the gradient change of the aperture from top to bottom, and thus after the wave absorbing agent is intercepted, the wave absorbing agent shows gradient distribution in the glass fiber paper, and the wave absorbing agent is beneficial to the entry and loss of electromagnetic waves.
Example 4
This example differs from example 1 in that in step 4) of this example, 0.3g of graphite powder (particle size 0.5 μm) and 0.8g of cobalt sesquioxide powder (particle size 0.3 μm) were mixed with 1.1L of water and stirred to prepare a mixed solution. The remaining steps and parameters were the same as in example 1.
Example 5
This example differs from example 1 in that in step 4) of this example, 1g of graphite powder (particle size 0.5 μm) and 1g of cobalt sesquioxide powder (particle size 0.3 μm) were mixed with 2.2L of water and stirred to prepare a mixed solution. The remaining steps and parameters were the same as in example 1.
Example 6
The difference between this example and example 5 is that in step 4) of this example, 0.05g of MXene (particle size of 0.5 μm) and 1g of cobalt sesquioxide powder (particle size of 0.3 μm) were mixed with 2.1L of water and stirred to prepare a mixed solution for use. The remaining steps and parameters were the same as in example 5.
Example 7
The difference between this example and example 3 is that in step 5), 0.1g of graphite powder (particle size of 0.5 μm) and 1g of cobalt sesquioxide powder (particle size of 0.3 μm) were mixed with 1.1L of water and stirred to prepare a mixed solution for use. The remaining steps and parameters were the same as in example 3.
Example 8
The difference between this example and example 3 is that in step 5), 0.1g of graphite powder (particle size of 0.5 μm) and 1g of cobalt sesquioxide powder (particle size of 0.3 μm) were mixed with 2.2L of water and stirred to prepare a mixed solution for use. The remaining steps and parameters were the same as in example 3.
Example 9
This example differs from example 1 in that in step 1) of this example 3g of alumina fiber having a filament diameter of 2 μm was mixed with 6L of water and dispersed uniformly to obtain a slurry. The remaining steps and parameters were the same as in example 1.
Comparative example 1
1) Mixing 5g of alkali-free glass fiber with a wire diameter of 32 mu m with 8L of water, and uniformly dispersing to obtain slurry;
2) Molding the slurry obtained in the step 1) on a sheet-making paper machine, squeezing the obtained molded paper by 20N, and then drying the molded paper in a drying box at 100 ℃ for 2min to obtain glass fiber paper;
3) Mixing 0.05g MXene (particle size of 0.5 μm) and 1g cobalt oxide powder (particle size of 0.3 μm) with 2.1L water, and stirring to obtain mixed solution;
4) Placing the glass fiber paper obtained in the step 2) into a suction filter funnel; taking out 200ml of the mixed solution obtained in the step 3), pouring the mixed solution into a 500ml suction filter funnel, and performing suction filtration to ensure that the wave-absorbing agent powder is distributed in the glass fiber paper to obtain wave-absorbing agent composite glass fiber paper; it is obvious that the obtained wave absorber composite glass fiber paper can not intercept MXene, so that the wave absorber and the glass fiber paper can not form a composite material.
The high strength absorbent papers prepared in examples 1 to 9 were subjected to thickness, burst strength and average reflection loss performance tests, and the test results are shown in table 1. Wherein the thickness is according to GB/T451 test; the burst is according to the GB/T454 test; the average reflection loss is measured by a vector network analyzer.
TABLE 1 summary of the properties of the high strength absorbent papers of examples 1-9
As can be seen from the data in Table 1, the high-strength absorbent papers of examples 1 to 9 of the present invention have a thickness of 0.50mm to 0.63mm, a bursting strength of 347kPa to 383kPa, and an average reflection loss value of-23 dB to-11 dB between 2 and 18 GHz.
As can be seen from comparative examples 1 and 4, changing the ratio of the wave-absorbing agent affects the average reflection loss between 2 and 18GHz because the ratio of the wave-absorbing agent controls the impedance matching, and the better the impedance matching, the more easily the electromagnetic wave enters the inside of the glass fiber paper and is lost.
As can be seen from comparative examples 1 and 5, the reduction of the concentration of the wave-absorbing agent mixture slightly reduced the wave-absorbing performance because the concentration of the wave-absorbing agent was reduced and the content of the intercepted wave-absorbing agent was reduced while passing through the inside of the glass fiber paper.
As can be seen from comparative examples 6 and 5 and comparative examples 3 and 7, the average reflection loss varies between 2 and 18GHz by changing the kind of the wave-absorbing agent, because the dielectric properties and magnetic properties of the wave-absorbing agents themselves are different, and thus the electric losses and magnetic losses are different, and the wave-absorbing properties are also different.
As can be seen from the comparison of example 5 and example 8, the glass fiber papers with different structures intercept the same mixture of the wave absorbing agent, and the performance of the double-layer structure wave absorbing paper is better than that of the single-layer wave absorbing paper.
As can be seen from comparing example 9 with example 1, the fiber type can affect the overall properties of the absorbent paper.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The numerical ranges recited herein include all numbers within the range and include any two of the range values within the range. The different values of the same index appearing in all embodiments of the invention can be combined arbitrarily to form a range value.
The technical features of the claims and/or the description of the present invention may be combined in a manner not limited to the combination of the claims by the relation of reference. The technical scheme obtained by combining the technical features in the claims and/or the specification is also the protection scope of the invention.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention in any way, but any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (11)
1. The preparation method of the high-strength wave-absorbing paper is characterized by comprising the following steps of:
s1, uniformly dispersing glass fibers and water to obtain slurry;
s2, forming glass fiber paper from the slurry obtained in the step S1 to obtain formed glass fiber paper;
s3, mixing the wave absorber powder with water, and uniformly stirring to obtain a mixed solution;
s4, pouring the mixed solution obtained in the step S3 into the formed glass fiber paper obtained in the step 2) for suction filtration, so that the wave-absorbing agent powder is distributed in the glass fiber paper to obtain wave-absorbing agent composite glass fiber paper;
and S5, sizing the wave-absorbing agent composite glass fiber paper obtained in the step S4, compositing the wave-absorbing agent composite glass fiber paper with PET non-woven fabrics, and drying the composite glass fiber paper to obtain the high-strength wave-absorbing paper.
2. The method for producing high-strength absorbent paper according to claim 1, wherein in step S1, the mass ratio of the glass fiber to water is (1-80): 10000; the fiber is at least one selected from glass fiber, quartz fiber, ceramic fiber and organic fiber with different diameters, and the diameter is less than or equal to 20 μm.
3. The method for producing a high-strength absorbent paper according to claim 1, wherein in the step S1, the fibers are at least two selected from the group consisting of glass fibers, quartz fibers, ceramic fibers and organic fibers, and the filament diameter thereof is not more than 20. Mu.m.
4. The method of producing high-strength absorbent paper according to claim 1, wherein in step S1, the filament diameters of at least two fibers are the same or different.
5. The method for producing high-strength absorbent paper according to claim 1, further comprising a step of drying the formed glassine paper after the glassine paper forming step in step S2, wherein the drying temperature is 80-120 ℃.
6. The method for producing high-strength wave-absorbing paper according to claim 1, wherein in the step S2, the steps of compounding, pressing and drying at least two kinds of molded glass fiber paper are further included after the glass fiber paper molding step; the load of the pressing is 5-80N; the drying temperature is 80-120 ℃.
7. The method for producing high-strength absorbent paper according to claim 1, wherein in step S3, the absorbent powder is conductive, magnetically permeable powder or fiber selected from the group consisting of graphite powder, graphene, moS 2 At least one of MXene, ferrite, iron powder, cobalt powder and nickel powder; the concentration of the wave absorber in the mixed solution is 0.001-30g/L; the mass ratio of the glass fiber to the wave absorber is 1:50-200:1.
8. The method for producing high-strength absorbent paper according to claim 1, wherein in step S5, the glue solution used for sizing is a thermosetting or thermoplastic polymer, and the temperature resistance is higher than 150 ℃; the non-woven fabric is 15-40g/m 2 PET nonwoven fabric of (C); the sizing method comprises one of spraying, suction filtration, soaking and suction filtration; the sizing amount is 2wt% to 15wt%.
9. The high-strength wave-absorbing paper is characterized in that the high-strength wave-absorbing paper is in a single-layer or multi-layer gradient, the thickness of the high-strength wave-absorbing paper is 0.20-mm-0.70-mm, the bursting strength is more than or equal to 300kPa, and the average reflection loss value between 2 GHz and 18GHz is lower than-10 dB.
10. The high-strength absorbent paper according to claim 9, wherein the high-strength absorbent paper is produced by the method according to any one of claims 1 to 8.
11. An isolated stealth material, characterized in that the isolated stealth material adopts the high-strength wave-absorbing paper according to claim 9 or 10.
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