CN112553942A - Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method - Google Patents
Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method Download PDFInfo
- Publication number
- CN112553942A CN112553942A CN202011400692.0A CN202011400692A CN112553942A CN 112553942 A CN112553942 A CN 112553942A CN 202011400692 A CN202011400692 A CN 202011400692A CN 112553942 A CN112553942 A CN 112553942A
- Authority
- CN
- China
- Prior art keywords
- dielectric loss
- wave
- paper
- aramid paper
- aramid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004760 aramid Substances 0.000 title claims abstract description 98
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 98
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 68
- 239000004917 carbon fiber Substances 0.000 claims abstract description 68
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 40
- 239000000835 fiber Substances 0.000 claims description 15
- 229920001131 Pulp (paper) Polymers 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000008204 material by function Substances 0.000 abstract description 2
- 241000264877 Hippospongia communis Species 0.000 description 78
- 238000012360 testing method Methods 0.000 description 34
- 229920006231 aramid fiber Polymers 0.000 description 28
- 238000007731 hot pressing Methods 0.000 description 13
- 238000001723 curing Methods 0.000 description 11
- 238000007598 dipping method Methods 0.000 description 10
- 238000001035 drying Methods 0.000 description 10
- 238000004026 adhesive bonding Methods 0.000 description 9
- 238000010030 laminating Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000002745 absorbent Effects 0.000 description 5
- 239000002250 absorbent Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
- D21H13/46—Non-siliceous fibres, e.g. from metal oxides
- D21H13/50—Carbon fibres
Abstract
The invention provides dielectric loss aramid paper, a wave-absorbing honeycomb and a preparation method, and belongs to the technical field of functional materials, wherein the dielectric loss aramid paper comprises aramid paper and carbon fibers mixed in the aramid paper, the length of the carbon fibers is 2-16 mm and is less than one fourth of the wavelength of electromagnetic waves to be absorbed, and the mass of the carbon fibers accounts for 1% -12% of the total mass of the dielectric loss aramid paper. The wave-absorbing honeycomb prepared from the dielectric loss aramid paper has the advantages of stable dielectric constant, large regulation and control range, high dielectric loss, high mechanical property, low density and the like.
Description
Technical Field
The invention relates to dielectric loss aramid paper, a wave-absorbing honeycomb and a preparation method, and belongs to the technical field of functional materials.
Background
The aramid paper honeycomb is a novel light-weight structure sandwich material, has the advantages of low density, high mechanical property, good heat resistance and the like, and is mainly used in a light-weight sandwich structure. The aramid paper honeycomb has excellent electromagnetic wave transmission performance and no electromagnetic wave absorption performance, and cannot be directly used in the wave absorption field. The aramid fiber paper honeycomb is modified through a physical or chemical method to obtain the aramid fiber wave-absorbing honeycomb, and the aramid fiber wave-absorbing honeycomb can meet the requirement of structure/wave-absorbing integration when being applied to a light sandwich structure.
Based on the background, if an aramid fiber paper wave-absorbing honeycomb with an electromagnetic loss function is to be developed, a conventional thought is realized by introducing an electromagnetic wave absorbent on the wall of the aramid fiber paper wave-transmitting honeycomb. At present, most of the existing aramid fiber paper wave-absorbing honeycombs are realized by the technological processes of firstly preparing common aramid fiber paper without an electromagnetic loss function into aramid fiber paper wave-transmitting honeycombs, then impregnating electromagnetic wave absorbent glue solution on the honeycomb walls of the aramid fiber paper wave-transmitting honeycombs, and finally curing and forming. The impregnation process cannot use a conductive fiber absorbent with a large length-diameter ratio, so that the dielectric loss performance of the aramid fiber paper wave-absorbing honeycomb is low, and the controllability of the impregnation process is poor, so that the electromagnetic performance stability of the aramid fiber paper wave-absorbing honeycomb is not high. In another thought, in the aramid fiber paper making process, conductive fiber absorbents such as carbon fibers and the like are mixed into paper pulp to prepare dielectric loss aramid fiber paper, and then the dielectric loss aramid fiber paper is prepared into the aramid fiber paper wave-absorbing honeycomb. The conductive fiber mixing process can realize the application of the conductive fiber absorbent with large length-diameter ratio in the aramid fiber paper wave-absorbing honeycomb, so that the aramid fiber paper wave-absorbing honeycomb has high dielectric loss performance, and in addition, the controllability of the consistency of the conductive fiber mixing process is good, so that the electromagnetic loss performance of the aramid fiber paper wave-absorbing honeycomb has high stability. At present, the aramid fiber paper wave-absorbing honeycomb is not reported.
Patent 200410037774.8 discloses a carbon fiber aramid fiber synthetic paper and a wet papermaking method, wherein the synthetic paper is composed of aramid fiber, carbon fiber and bonding fiber, and is subjected to surface sizing treatment, the synthetic paper is not suitable for making wave-absorbing honeycombs because the synthetic paper is added with polyester fiber or polyphenylene sulfide fiber with lower melting point as the bonding fiber, and the synthetic paper is easy to shrink and deform after hot pressing, so that the honeycombs made based on the synthetic paper have poor high-temperature dimensional stability, and in addition, the surface of the synthetic paper is subjected to sizing treatment, so that the permeability of the synthetic paper to resin is reduced, and the mechanical property of the honeycombs made based on the synthetic paper is poor. Patent 201910603007.5 discloses a high-performance carbon fiber/meta-aramid fibrid paper-based composite material and a preparation method thereof, the paper-based composite material is composed of aramid fibrid and carbon fiber, and the paper-based composite material is not suitable for making wave-absorbing honeycombs because the paper-based composite material does not contain aramid chopped fiber and has low mechanical properties, resulting in poor mechanical properties of honeycombs made based on the paper-based composite material. Neither the synthetic paper disclosed in patent 200410037774.8 nor the paper-based composite material disclosed in patent 201910603007.5 is oriented to wave-absorbing application, so that how to select the length and the addition amount of carbon fibers according to the wavelength of electromagnetic waves to be absorbed is not disclosed, and the synthetic paper and the paper-based composite material cannot be directly used for manufacturing aramid fiber paper wave-absorbing honeycombs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides dielectric loss aramid paper, a wave-absorbing honeycomb and a preparation method thereof, wherein the dielectric loss aramid paper has high dielectric loss, stable dielectric constant and large dielectric constant regulation range, and also has high-temperature dimensional stability and high mechanical property.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the dielectric loss aramid paper comprises aramid paper and carbon fibers mixed in the aramid paper, wherein the length of the carbon fibers is 2-16 mm and is less than one fourth of the wavelength of electromagnetic waves required to be absorbed, and the mass of the carbon fibers accounts for 1% -12% of the total mass of the dielectric loss aramid paper.
Preferably, the length of the carbon fiber and the percentage of the mass of the carbon fiber to the total mass of the dielectric loss aramid paper are selected according to the wavelength of the absorbed electromagnetic wave.
Preferably, when the wavelength of the electromagnetic wave to be absorbed is more than 60mm and less than or equal to 300mm, the length of the carbon fiber is 8-16 mm and less than one fourth of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1-6% of the total mass of the dielectric loss aramid paper.
Preferably, when the wavelength of the electromagnetic wave to be absorbed is greater than 30mm and less than or equal to 60mm, the length of the carbon fiber is 4-8 mm and less than one fourth of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1.5-9% of the total mass of the dielectric loss aramid paper.
Preferably, when the wavelength of the electromagnetic wave to be absorbed is more than 15mm and less than or equal to 30mm, the length of the carbon fiber is 2-4 mm and less than one fourth of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 2% -12% of the total mass of the dielectric loss aramid paper.
The wave-absorbing honeycomb is prepared from the dielectric loss aramid fiber paper by a honeycomb preparation method, the steps of the wave-absorbing honeycomb preparation method comprise core strip glue sticking, lamination, hot pressing, stretching, glue dipping, drying and curing, and the wave-absorbing honeycomb belongs to the known technology in the field.
A preparation method of dielectric loss aramid paper comprises the following steps:
1) preparing wave-absorbing paper pulp, wherein the wave-absorbing paper pulp comprises carbon fibers, aramid chopped fibers, aramid pulp, water and a dispersing agent; the length of the carbon fiber is 2-16 mm and is less than one fourth of the wavelength of the electromagnetic wave to be absorbed; the adding amount of the carbon fiber is 1-12% of the total mass of the dielectric loss aramid paper; the preparation process of the pulp is a known technology in the field, and comprises the steps of defibering and dispersing carbon fibers into suspension, defibering and dispersing aramid chopped fibers into suspension, defibering and dispersing aramid pulp into suspension, and blending the carbon fiber/aramid chopped fiber/aramid pulp suspension to prepare the wave-absorbing pulp, wherein specific process parameters are determined according to actual production needs;
2) preparing dielectric loss aramid paper by using the wave-absorbing paper pulp prepared in the step 1); the aramid fiber paper preparation process is a known technology in the field, and comprises the steps of preparing dielectric loss aramid fiber paper base paper by using wave-absorbing paper pulp, hot-pressing the base paper into final dielectric loss aramid fiber paper and the like, wherein specific process parameters are determined according to actual production needs.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the invention, carbon fibers are mixed into aramid fiber paper in the papermaking link, and the carbon fibers with specific length range and specific content range are selected according to the wavelength of electromagnetic waves to be absorbed, so that the dielectric loss aramid fiber paper has high dielectric loss;
(2) the dielectric property of the dielectric loss aramid paper can be regulated and controlled within a large range by changing the addition amount of the carbon fiber, so that the dielectric constant of the prepared aramid paper wave-absorbing honeycomb can be regulated and controlled within a large range, and a large design space is provided for the application of the aramid paper wave-absorbing honeycomb in a multi-layer wave-absorbing material;
(3) compared with the common aramid paper, the dielectric loss aramid paper of the invention is only added with a small amount of carbon fibers, so that the dielectric properties of the dielectric loss aramid paper are equivalent to those of the common aramid paper, and the prepared aramid paper wave-absorbing honeycomb keeps excellent mechanical properties equivalent to those of the common aramid paper honeycomb.
Drawings
FIG. 1 is a schematic side view of a dielectric loss aramid paper of the present invention;
FIG. 2 is a schematic front view of a dielectric loss aramid paper of the present invention;
FIG. 3 is a schematic view of a preparation process of the wave-absorbing honeycomb of the present invention;
FIGS. 4A and 4B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 1;
FIGS. 5A and 5B are a dielectric constant test curve and a dielectric loss tangent test curve of the wave-absorbing honeycomb in example 2;
FIGS. 6A and 6B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 3;
FIGS. 7A and 7B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 4;
FIGS. 8A and 8B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 5;
FIGS. 9A and 9B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 6.
FIGS. 10A and 10B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 7;
FIGS. 11A and 11B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb of example 8;
FIGS. 12A and 12B are dielectric constant test curves and dielectric loss tangent test curves of the wave-absorbing honeycomb in example 9.
In the figures 1-2, 1 is aramid paper, and 2 is carbon fiber; in fig. 4A to 12B, the abscissa Frequency is Frequency, the unit GHz, the ordinate Permittivity is dielectric constant, and the ordinate Losstangent is dielectric tangent value.
Detailed Description
In order to make the technical solution of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
The dielectric loss aramid paper provided by the embodiment is composed of aramid paper 1 and carbon fibers 2 mixed in the aramid paper as shown in fig. 1, the length of the carbon fibers is 6mm, the mass of the carbon fibers accounts for 1.5% of the total mass of the dielectric loss aramid paper, and the quantitative amount of the dielectric loss aramid paper is 42g/m2The thickness was 61 μm.
The preparation method comprises the following steps:
(1) respectively adding carbon fiber, aramid chopped fiber and aramid pulp into water containing a dispersing agent, defibering and dispersing, and mixing to prepare wave-absorbing paper pulp;
(2) and (3) preparing the dielectric loss aramid paper from the wave-absorbing paper pulp obtained in the first step through papermaking and hot pressing processes.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 54kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat-pressing strength test on the wave-absorbing honeycomb to obtain a result of 2.79MPa, and carrying out a dielectric constant and dielectric loss tangent value test on the wave-absorbing honeycomb in a 5.85 GHz-8.2 GHz frequency band (the wavelength is 36.6-51.3 mm), wherein the result is shown in fig. 4a and 4b, the dielectric constant of the obtained aramid paper wave-absorbing honeycomb is reduced from 1.6 to 1.4 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.19 to 0.26.
Example 2
The preparation method comprises the following steps:
the difference from the example 1 is that the length of the carbon fiber is 4mm, the mass of the carbon fiber accounts for 4.5 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 1.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat compression strength test on the wave-absorbing honeycomb to obtain a result of 5.63MPa, and carrying out a dielectric constant and dielectric loss tangent value test on the wave-absorbing honeycomb in a 5.85 GHz-8.2 GHz frequency band (with the wavelength of 36.6-51.3 mm), wherein the result is shown in fig. 5a and 5b, the dielectric constant of the obtained aramid paper wave-absorbing honeycomb is reduced from 3.5 to 3.0 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.29 to 0.41.
Example 3
The preparation method comprises the following steps:
the difference from the example 1 is that the length of the carbon fiber is 8mm, the mass of the carbon fiber accounts for 9.0 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 1.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat-pressing strength test on the wave-absorbing honeycomb to obtain a result of 5.44MPa, and carrying out a frequency band of 5.85 GHz-8.2 GHz (the wavelength is 36.6 mm-51).3mm) and the dielectric loss tangent value, and the results are shown in fig. 6a and 6b, the obtained aramid paper wave-absorbing honeycomb has the dielectric constant reduced from 6.5 to 5.2 and the dielectric loss tangent value increased from 0.48 to 0.69 along with the increase of the frequency.
Example 4
The preparation method comprises the following steps:
the difference from the example 1 is that the length of the carbon fiber is 12mm, the mass of the carbon fiber accounts for 1 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 1.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 54kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat compression strength test on the wave-absorbing honeycomb to obtain a result of 2.82MPa, and carrying out a dielectric constant and dielectric loss tangent value test on the wave-absorbing honeycomb at a frequency band of 2.6 GHz-3.95 GHz (the wavelength is 75.9 mm-115.4 mm), wherein the result is shown in fig. 7a and 7b, the dielectric constant of the obtained aramid paper wave-absorbing honeycomb is reduced from 1.76 to 1.65 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.11 to 0.16.
Example 5
The preparation method comprises the following steps:
the difference from the example 4 is that the length of the carbon fiber is 8mm, the mass of the carbon fiber accounts for 3 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 4.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat compression strength test on the wave-absorbing honeycomb to obtain a result of 5.68MPa, and carrying out a dielectric constant and dielectric loss tangent value test on the wave-absorbing honeycomb in a 2.6 GHz-3.95 GHz frequency band (with the wavelength of 75.9-115.4 mm), wherein the result is shown in fig. 8a and 8b, the dielectric constant of the obtained aramid paper wave-absorbing honeycomb is reduced from 3.4 to 3.2 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.23 to 0.32.
Example 6
The preparation method comprises the following steps:
the difference from the example 4 is that the length of the carbon fiber is 16mm, the mass of the carbon fiber accounts for 6 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 4.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, carrying out a flat compression strength test on the wave-absorbing honeycomb to obtain a result of 5.46MPa, and carrying out a dielectric constant and dielectric loss tangent value test on the wave-absorbing honeycomb in a 2.6 GHz-3.95 GHz frequency band (with the wavelength of 75.9-115.4 mm), wherein the result is shown in a graph 9a and a graph 9b, the obtained aramid paper wave-absorbing honeycomb has the dielectric constant reduced from 6.7 to 6.1 and the dielectric loss tangent value increased from 0.29 to 0.41 along with the increase of the frequency.
Example 7
The preparation method comprises the following steps:
the difference from the example 1 is that the length of the carbon fiber is 3mm, the mass of the carbon fiber accounts for 2 percent of the total mass of the dielectric loss aramid paper, and the rest process is the same as the example 1.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 54kg/m3Controlling the process to prepare the wave-absorbing honeycomb, testing the flat compression strength of the wave-absorbing honeycomb to obtain a result of 2.67MPa, and testing the dielectric constant and the dielectric loss tangent value of the wave-absorbing honeycomb in a frequency band of 12.4 GHz-18 GHz (the wavelength is 16.7 mm-24.2 mm), wherein the result is shown in figure 10a and figure 10b, the dielectric constant of the obtained wave-absorbing honeycomb is reduced from 2.1 to 1.8 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.26 to 0.33.
Example 8
The preparation method comprises the following steps:
the difference from example 7 is that the length of the carbon fiber is 2mm, the mass of the carbon fiber accounts for 6% of the total mass of the dielectric loss aramid paper, and the rest of the process is the same as example 7.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, and carrying out flat-pressing strength measurement on the wave-absorbing honeycombThe result of the test is 5.32MPa, and the dielectric constant and the dielectric loss tangent value of the frequency band of 12.4 GHz-18 GHz (the wavelength is 16.7 mm-24.2 mm) are tested, and the result is shown in figure 11a and figure 11b, the dielectric constant of the obtained wave-absorbing honeycomb is reduced from 3.5 to 3.0, and the dielectric loss tangent value is increased from 0.42 to 0.56 along with the increase of the frequency.
Example 9
The preparation method comprises the following steps:
the difference from example 7 is that the length of the carbon fiber is 4mm, the mass of the carbon fiber accounts for 12% of the total mass of the dielectric loss aramid paper, and the rest of the process is the same as example 7.
The prepared dielectric loss aramid paper is subjected to core strip gluing, laminating, hot pressing, stretching, gum dipping, drying and curing processes according to the length of the side of a cell of 1.83mm and the density of 72kg/m3Controlling the process to prepare the wave-absorbing honeycomb, testing the flat compression strength of the wave-absorbing honeycomb to obtain a result of 5.18MPa, and testing the dielectric constant and the dielectric loss tangent value of the wave-absorbing honeycomb in a frequency band of 12.4 GHz-18 GHz (the wavelength is 16.7 mm-24.2 mm), wherein the result is shown in a graph 12a and a graph 12b, the dielectric constant of the obtained wave-absorbing honeycomb is reduced from 6.2 to 4.8 along with the increase of the frequency, and the dielectric loss tangent value is increased from 0.53 to 0.66.
The invention has not been described in detail and is in part known to those of skill in the art.
The above embodiments are only intended to illustrate the technical solution of the present invention, but not to limit it, and a person skilled in the art can modify the technical solution of the present invention or substitute it with an equivalent, and the protection scope of the present invention is subject to the claims.
Claims (9)
1. The dielectric loss aramid paper is characterized by comprising aramid paper and carbon fibers mixed in the aramid paper, wherein the length of the carbon fibers is 2-16 mm and is less than one fourth of the wavelength of electromagnetic waves required to be absorbed, and the mass of the carbon fibers accounts for 1% -12% of the total mass of the dielectric loss aramid paper.
2. The dielectric loss aramid paper as claimed in claim 1, wherein when the wavelength of the electromagnetic wave to be absorbed is greater than 60mm and less than or equal to 300mm, the length of the carbon fiber is 8-16 mm and less than a quarter of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1-6% of the total mass of the dielectric loss aramid paper.
3. The dielectric loss aramid paper as claimed in claim 1, wherein when the wavelength of the electromagnetic wave to be absorbed is greater than 30mm and less than or equal to 60mm, the length of the carbon fiber is 4-8 mm and less than a quarter of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1.5-9% of the total mass of the dielectric loss aramid paper.
4. The dielectric loss aramid paper as claimed in claim 1, wherein when the wavelength of the electromagnetic wave to be absorbed is greater than 15mm and less than or equal to 30mm, the length of the carbon fiber is 2-4 mm and less than one fourth of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 2-12% of the total mass of the dielectric loss aramid paper.
5. A wave-absorbing honeycomb, characterized in that the dielectric loss aramid paper of any one of claims 1-4 is prepared by a honeycomb preparation method.
6. The preparation method of the dielectric loss aramid paper is characterized by comprising the following steps of:
preparing wave-absorbing paper pulp, wherein the wave-absorbing paper pulp comprises carbon fibers, aramid chopped fibers, aramid pulp, water and a dispersing agent; the length of the carbon fiber is 2-16 mm and is less than one fourth of the wavelength of the electromagnetic wave to be absorbed; the adding amount of the carbon fiber is 1-12% of the total mass of the dielectric loss aramid paper;
and preparing the dielectric loss aramid paper by using the prepared wave-absorbing paper pulp.
7. The method for preparing the dielectric loss aramid paper as claimed in claim 6, wherein when the wavelength of the electromagnetic wave to be absorbed is more than 60mm and less than or equal to 300mm, the length of the carbon fiber is 8-16 mm and less than one fourth of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1-6% of the total mass of the dielectric loss aramid paper.
8. The method for preparing the dielectric loss aramid paper as claimed in claim 6, wherein when the wavelength of the electromagnetic wave to be absorbed is greater than 30mm and less than or equal to 60mm, the length of the carbon fiber is 4-8 mm and less than one quarter of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 1.5-9% of the total mass of the dielectric loss aramid paper.
9. The method for preparing the dielectric loss aramid paper as claimed in claim 6, wherein when the wavelength of the electromagnetic wave to be absorbed is more than 15mm and less than or equal to 30mm, the length of the carbon fiber is 2-4 mm and less than one quarter of the wavelength of the electromagnetic wave to be absorbed, and the mass of the carbon fiber accounts for 2-12% of the total mass of the dielectric loss aramid paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011400692.0A CN112553942A (en) | 2020-12-02 | 2020-12-02 | Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011400692.0A CN112553942A (en) | 2020-12-02 | 2020-12-02 | Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112553942A true CN112553942A (en) | 2021-03-26 |
Family
ID=75047921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011400692.0A Pending CN112553942A (en) | 2020-12-02 | 2020-12-02 | Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112553942A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113584940A (en) * | 2021-06-24 | 2021-11-02 | 浙江超探碳纤维科技有限公司 | Preparation method of carbon fiber paper |
| CN114561831A (en) * | 2022-02-24 | 2022-05-31 | 陕西科技大学 | Carbon fiber paper with electromagnetic loss capability enhanced by silicon carbide and preparation method thereof |
| CN115821643A (en) * | 2022-12-15 | 2023-03-21 | 航天特种材料及工艺技术研究所 | Wave-absorbing honeycomb with absorbent distributed in gradient manner and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005260214A (en) * | 2004-02-12 | 2005-09-22 | Toray Ind Inc | Electromagnetic wave shield material, stereo structure, electromagnetic wave shield property interior material, and image display device |
| US20060266486A1 (en) * | 2005-05-26 | 2006-11-30 | Levit Mikhail R | Electroconductive aramid paper |
| CN103952947A (en) * | 2014-04-23 | 2014-07-30 | 华南理工大学 | Aramid fiber paper and preparation method thereof |
| CN104404814A (en) * | 2014-09-10 | 2015-03-11 | 华南理工大学 | Wave-absorbing paper and preparation method and application thereof |
| CN105556032A (en) * | 2013-09-04 | 2016-05-04 | 杜邦帝人先进纸（日本）有限公司 | Conductive aramid paper and method for producing same |
| CN110024503A (en) * | 2016-12-08 | 2019-07-16 | 杜邦帝人先进纸（日本）有限公司 | Electromagnetic wave inhibiting sheet material |
| CN111869341A (en) * | 2018-03-30 | 2020-10-30 | 杜邦帝人先进纸（日本）有限公司 | Electromagnetic wave absorbing sheet and method for producing same |
-
2020
- 2020-12-02 CN CN202011400692.0A patent/CN112553942A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005260214A (en) * | 2004-02-12 | 2005-09-22 | Toray Ind Inc | Electromagnetic wave shield material, stereo structure, electromagnetic wave shield property interior material, and image display device |
| US20060266486A1 (en) * | 2005-05-26 | 2006-11-30 | Levit Mikhail R | Electroconductive aramid paper |
| CN105556032A (en) * | 2013-09-04 | 2016-05-04 | 杜邦帝人先进纸（日本）有限公司 | Conductive aramid paper and method for producing same |
| CN103952947A (en) * | 2014-04-23 | 2014-07-30 | 华南理工大学 | Aramid fiber paper and preparation method thereof |
| CN104404814A (en) * | 2014-09-10 | 2015-03-11 | 华南理工大学 | Wave-absorbing paper and preparation method and application thereof |
| CN110024503A (en) * | 2016-12-08 | 2019-07-16 | 杜邦帝人先进纸（日本）有限公司 | Electromagnetic wave inhibiting sheet material |
| CN111869341A (en) * | 2018-03-30 | 2020-10-30 | 杜邦帝人先进纸（日本）有限公司 | Electromagnetic wave absorbing sheet and method for producing same |
Non-Patent Citations (3)
| Title |
|---|
| 吴雪丹等: "提高芳纶原纸强度的工艺研究", 《浙江科技学院学报》 * |
| 张忠伦等: "《室内电磁辐射污染控制与防护技术》", 30 September 2016, 中国建材工业出版 * |
| 程芳静等: "纸基吸波材料的制备及其电磁性能探究", 《中国造纸》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113584940A (en) * | 2021-06-24 | 2021-11-02 | 浙江超探碳纤维科技有限公司 | Preparation method of carbon fiber paper |
| CN114561831A (en) * | 2022-02-24 | 2022-05-31 | 陕西科技大学 | Carbon fiber paper with electromagnetic loss capability enhanced by silicon carbide and preparation method thereof |
| CN114561831B (en) * | 2022-02-24 | 2023-01-31 | 陕西科技大学 | Carbon fiber paper with electromagnetic loss capability enhanced by silicon carbide and preparation method thereof |
| CN115821643A (en) * | 2022-12-15 | 2023-03-21 | 航天特种材料及工艺技术研究所 | Wave-absorbing honeycomb with absorbent distributed in gradient manner and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112553942A (en) | Dielectric loss aramid paper, wave-absorbing honeycomb and preparation method | |
| CN1942629B (en) | Aramid paper blend | |
| CN105144431B (en) | Three area's battery separators | |
| CN101343845B (en) | Aramid fiber honeycomb core base stock and preparation method thereof | |
| CA2781109A1 (en) | Honeycomb core based on carbon fiber paper and articles made from same | |
| CN114214871A (en) | Coating type wave-absorbing aramid paper, wave-absorbing honeycomb and preparation method | |
| EP1019246A1 (en) | Microsphere-containing circuit board paper | |
| EP2501856B1 (en) | Folded core based on carbon fiber paper and articles made from same | |
| WO2012100653A1 (en) | Aramid honeycomb core board | |
| CN101003959A (en) | Multiple proportional layered composite manufactured amide paper of aramid fiber | |
| CN111472191A (en) | Para-aramid fiber plate and preparation method thereof | |
| CN101728504B (en) | Lithium ion battery diaphragm flexible substrate by wet papermaking and manufacturing method thereof | |
| EP1840263A1 (en) | Polyketone fiber paper, polyketone fiber paper core material for printed wiring board and printed wiring board | |
| CN103952947A (en) | Aramid fiber paper and preparation method thereof | |
| WO2010022311A1 (en) | Folded core having a high compression modulus and articles made from the same | |
| CN114214866A (en) | Magnetic loss aramid paper, wave-absorbing honeycomb and preparation method | |
| CN109648678A (en) | Wood-fibred-coir composite sound-absorbing material and preparation method thereof | |
| EP1963567B1 (en) | Pipd paper and components made therefrom | |
| CN115198567A (en) | High-performance aramid laminated board and preparation method and application thereof | |
| KR101547776B1 (en) | Aramid wet-laid non woven fabrics for honeycomb and process of producing thereof | |
| CN115821643A (en) | Wave-absorbing honeycomb with absorbent distributed in gradient manner and preparation method thereof | |
| CN113005820B (en) | Preparation method of multilayer composite aramid paper | |
| RU2159304C2 (en) | Aerodynamic method for manufacture of sanitary-hygienic paper | |
| CN104120619A (en) | Method for preparing battery diaphragm paper by using glass fiber and glass wool | |
| US20080105395A1 (en) | Polyketone Fiber Paper, Polyketone Fiber Paper Core Material For Printed Wiring Board, And Printed Wiring Board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210326 |