Aramid paper honeycomb for wave transmission and preparation method thereof

Abstract

The invention relates to the technical field of composite materials, and in particular to a method for preparing a wave-transmitting aramid paper honeycomb. The method comprises the following steps: immersing the aramid paper honeycomb in a cleaning solution for cleaning, then irradiating the aramid paper honeycomb with rays for surface chlorination, and then immersing the aramid paper honeycomb in a NaOH solution for hydroxylation treatment; immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, and performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb; immersing the surface epoxy aramid paper honeycomb in an interface enhancement solution; drawing the honeycomb into a dipping device filled with glue, and performing dipping, curing and weighing in sequence at least once; weighing the preformed aramid paper honeycomb after dipping and curing treatment each time, and increasing the weight to 350-550% of the weight of the aramid paper honeycomb; and also comprising a wave-transmitting aramid paper honeycomb, wherein the raw materials and process for producing the wave-transmitting aramid paper honeycomb are optimized to solve the problem of high dielectric loss of the obtained aramid paper honeycomb.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to an aramid paper honeycomb for wave transmission and a preparation method thereof. Background Art

[0002] Generally, the dielectric loss tangent tgδ of the core layer of the wave-transmitting interlayer material is required to be close to zero, and the dielectric constant ε is as low as possible. Cyanate ester resin has the advantages of low dielectric constant and extremely small dielectric loss tangent value, high glass transition temperature, low shrinkage and moisture absorption rate, low outgassing, excellent mechanical properties and bonding properties, but its disadvantage is that it is expensive.

[0003] At present, the method for preparing wave-transmitting aramid paper honeycomb sandwich materials is mostly to immerse the honeycomb directly in cyanate ester glue. In order to penetrate into the interior of the base material, a long time of immersion is required, which reduces production efficiency and increases cost. In addition, due to the effect of gravity during the dipping and subsequent airing process, the uniformity of the dipping is difficult to control, which can easily cause uneven density of the honeycomb block, seriously affecting the quality of the honeycomb product.

[0004] Therefore, in view of the above problems, the present invention urgently needs to provide a wave-transmitting aramid paper honeycomb and a preparation method thereof. Summary of the invention

[0005] The object of the present invention is to provide a wave-transmitting aramid paper honeycomb and a preparation method thereof. By designing the preparation method, the raw materials and process for producing the wave-transmitting aramid paper honeycomb are optimized to solve the problem of high dielectric loss of the obtained aramid paper honeycomb.

[0006] The present invention provides a method for preparing a wave-transmitting aramid paper honeycomb, which is characterized in that:

[0007] The steps include:

[0008] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb;

[0009] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0010] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0011] S4. Stretch the low dielectric constant aramid paper honeycomb into a dipping device filled with glue, and perform dipping, curing and weighing at least once in sequence to obtain a preformed aramid paper honeycomb; wherein the dipping device comprises a collecting pool for recovering the glue, and at least one group of corresponding rotatable dipping rollers are sequentially installed in the collecting pool; a channel for filling the glue is opened in the dipping roller, and N columns of glue holes and M columns of glue collection holes are sequentially opened along the circumference of the outer wall of the dipping roller, 2≤N≤3, 2≤M≤3; a glue discharge brush is bonded to the inner wall of each glue discharge hole, and a glue collection brush is bonded to the inner wall of each glue collection hole;

[0012] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 350-550% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0013] Preferably, in step S4, the glue discharging brush and the glue dipping roller are arranged at an acute angle of 35° to 75°; the glue collecting brush and the glue dipping roller are arranged at an obtuse angle of 125° to 165°;

[0014] The low dielectric constant aramid paper honeycomb is stretched between corresponding rotatable dipping rollers. When the low dielectric constant aramid paper honeycomb passes through a glue discharging brush, the low dielectric constant aramid paper honeycomb is dipped in glue. When the low dielectric constant aramid paper honeycomb passes through a glue collecting brush, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller through a glue collecting hole.

[0015] Preferably, in step S4, a heating tube is provided in the collecting pool, and the heating tube is electrically connected to a temperature sensor; a rotating shaft is installed in the dipping roller, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush and the glue collection brush are both 5 to 7 mm, and the materials of the glue discharge brush and the glue collection brush are both wool or pig bristles.

[0016] Preferably, in step S1, the cleaning solution includes acetone or ethanol; the radiation irradiation includes plasma treatment or gamma ray irradiation, and the treatment time is 0.5h to 1h.

[0017] Preferably, in step S2, the coupling agent solution includes 10 to 25 parts of water, 70 to 100 parts of alcohol, and 4 to 10 parts of γ-glycidyloxypropyltrimethoxysilane, by mass fraction, and the soaking time is 13 to 15 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 120 to 150°C, and the drying time is 3 to 5 hours.

[0018] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 40 to 60 parts of cyanate resin, 35 to 50 parts of butyl acetate and 1 to 5 parts of acrylic acid.

[0019] Preferably, in step S4, the adhesive solution includes 580 to 620 parts of cyanate ester, 520 to 550 parts of solvent and 55 to 65 parts of toughening agent by mass fraction; the viscosity of the adhesive solution ranges from 0.35 mPa·s to 0.75 mPa·s; wherein the cyanate ester includes at least one of tetramethyl bisphenol F cyanate ester, bisphenol E cyanate ester or dicyclopentadiene cyanate ester; the solvent includes butyl acetate or ethyl acetate; and the toughening agent includes at least one of nitrile rubber or acrylic resin.

[0020] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 0.5~2°C / min.

[0021] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0022] Also included is a wave-transmitting aramid paper honeycomb obtained based on any of the preparation methods described above.

[0023] The wave-transmitting aramid paper honeycomb and the preparation method thereof provided by the present invention have the following improvements compared with the prior art:

[0024] 1. The present invention provides a method for preparing a wave-transmitting aramid paper honeycomb, comprising the steps of: immersing the aramid paper honeycomb in a cleaning solution for cleaning, then irradiating the aramid paper honeycomb with radiation for surface chlorination, and then immersing the aramid paper honeycomb in a NaOH solution for hydroxylation treatment; exposing hydroxyl groups on the surface of the aramid paper honeycomb fibers, immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, and reacting the hydroxyl groups on the surface of the aramid paper honeycomb fibers with the coupling agent to cause the aramid paper honeycomb to have an oxirane functional group, and the oxirane group can react with the triazine ring in the cyanate ester, thereby improving the interface bonding strength between the aramid paper honeycomb and the cyanate ester resin, and when the interface bonding strength is enhanced, the charge migration of the aramid paper honeycomb decreases, the dielectric constant decreases, and a low dielectric constant aramid paper honeycomb is obtained.

[0025] 2. The toughening agent in the adhesive does not react with the cyanate ester but forms a phase-separated toughening structure, thereby improving the bonding between the fiber and the resin adhesive in the aramid paper honeycomb and improving the mechanical properties of the wave-transmitting aramid paper honeycomb. The low dielectric constant aramid paper honeycomb is repeatedly dipped in adhesive to ensure the stability of the interface bonding strength between the aramid paper honeycomb and the cyanate ester resin, thereby ensuring the service life of the wave-transmitting aramid paper honeycomb during use.

[0026] 3. The glue dipping device comprises a collection pool for recovering glue liquid, wherein rotatable glue dipping rollers corresponding to each other are installed in the collection pool, wherein a channel for filling glue liquid is opened in the glue dipping roller, wherein N rows of glue holes and M rows of glue collecting holes are sequentially opened along the circumference of the outer wall of the glue dipping roller (3), wherein 2≤N≤3, 2≤M≤3; wherein a glue discharging brush (2) is bonded to the inner wall of each glue discharging hole, wherein a glue collecting brush (6) is bonded to the inner wall of each glue collecting hole, wherein the rotation speed of the glue dipping roller is controlled by electromechanical equipment, thereby controlling the glue discharging amount of the glue discharging hole; wherein glue discharging holes connected to the channel are opened at intervals along the side wall of the glue dipping roller, wherein a brush is bonded to each glue discharging hole, wherein the glue liquid impregnates the brush under the centrifugal force of the rotation of the glue dipping roller, thereby repeatedly brushing glue on the low dielectric constant aramid paper honeycomb; wherein a heating pipe in the collection pool heats the recovered glue liquid, and controls the heating by a sensor. Heat temperature; N rows of glue holes connected to the channel are opened at circumferential intervals along the left half of the dipping roller, and a glue discharge brush is bonded to the inner wall of each glue discharge hole; M rows of glue collection holes connected to the channel are opened at circumferential intervals along the right half of the dipping roller, and a glue collection brush is bonded to the inner wall of each glue collection hole; the low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers, and when the low dielectric constant aramid paper honeycomb passes through the glue discharge brush, the low dielectric constant aramid paper honeycomb is glued and dipped in glue; when the low dielectric constant aramid paper honeycomb passes through the glue collection brush, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller through the glue collection holes, completing the dipping and recovery of the surface of the low dielectric constant aramid paper honeycomb, and controlling the weight stability and dielectric constant stability of the finished product of the wave-transmitting aramid paper honeycomb.

[0027] 4. The wave-transmitting aramid paper honeycomb obtained by the present invention has higher flat compression strength, lower dielectric constant and dielectric loss, and better discreteness of mechanical properties, which meets the requirements of lightweight, high strength and lower dielectric loss of honeycomb core materials for radar antenna covers, and is beneficial to weight reduction of radar antenna covers and further improvement of broadband wave transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] FIG1 is a flow chart of a method for preparing a wave-transmitting aramid paper honeycomb according to the present invention;

[0030] FIG2 is a front view of the dipping device of the present invention;

[0031] FIG3 is a cross-sectional view of the dipping roller of the present invention;

[0032] FIG. 4 is a chemical equation diagram of the method for preparing the wave-transmitting aramid paper honeycomb of the present invention.

[0033] The reference numerals are as follows:

[0034] 1. Collection tank; 4. Heating tube; 5. Temperature sensor; 3. Glue dipping roller; 2. Glue discharging brush; 6. Glue collecting brush. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] A method for preparing a wave-transmitting aramid paper honeycomb.

[0039] The steps include:

[0040] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; Figure 4 As shown;

[0041] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0042] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0043] S4. Stretch the low dielectric constant aramid paper honeycomb into a dipping device filled with glue, perform dipping, curing and weighing at least once in sequence, and obtain a preformed aramid paper honeycomb; wherein the dipping device comprises a collecting pool 1 for recovering the glue, and at least one group of corresponding rotatable dipping rollers 3 are sequentially installed in the collecting pool 1; a channel for filling the glue is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collection holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collection brush 6 is bonded to the inner wall of each glue collection hole;

[0044] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 350-550% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0045] Preferably, in step S4, the glue discharging brush 2 and the glue dipping roller 3 are arranged at an acute angle of 35° to 75°; the glue collecting brush 6 and the glue dipping roller 3 are arranged at an obtuse angle of 125° to 165°;

[0046] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0047] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 5 to 7 mm, and the materials of the glue discharge brush 2 and the glue collection brush 6 are both wool or pig bristles.

[0048] Preferably, in step S2, the coupling agent solution includes 10 to 25 parts of water, 70 to 100 parts of alcohol, and 4 to 10 parts of γ-glycidyloxypropyltrimethoxysilane, by mass fraction, and the soaking time is 13 to 15 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 120 to 150°C, and the drying time is 3 to 5 hours.

[0049] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 40 to 60 parts of cyanate resin, 35 to 50 parts of butyl acetate and 1 to 5 parts of acrylic acid.

[0050] Preferably, in step S4, the adhesive solution includes 580 to 620 parts of cyanate ester, 520 to 550 parts of solvent and 55 to 65 parts of toughening agent by mass fraction; the viscosity of the adhesive solution ranges from 0.35 mPa·s to 0.75 mPa·s; wherein the cyanate ester includes at least one of tetramethyl bisphenol F cyanate ester, bisphenol E cyanate ester or dicyclopentadiene cyanate ester; the solvent includes butyl acetate or ethyl acetate; and the toughening agent includes at least one of nitrile rubber or acrylic resin.

[0051] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 0.5~2°C / min.

[0052] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0053] A wave-transmitting aramid paper honeycomb obtained based on any one of the preparation methods described above.

[0054] Embodiment 1

[0055] In this embodiment, a method for preparing a wave-transmitting aramid paper honeycomb is provided.

[0056] The steps include:

[0057] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; Figure 4 As shown;

[0058] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0059] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0060] S4. The low dielectric constant aramid paper honeycomb is drawn into a dipping device containing a glue solution, and dipping, curing and weighing are performed twice in sequence to obtain a preformed aramid paper honeycomb; wherein, Figure 2 , Figure 3 As shown, the dipping device comprises a collecting pool 1 for recovering glue liquid, in which at least one group of corresponding rotatable dipping rollers 3 are sequentially installed; a channel for filling glue liquid is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole;

[0061] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 400% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0062] Preferably, in step S4, the glue discharging brush 2 and the glue dipping roller 3 are arranged at an acute angle of 45°; the glue collecting brush 6 and the glue dipping roller 3 are arranged at an obtuse angle of 125°;

[0063] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0064] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 5 mm, and the material of the glue discharge brush 2 and the glue collection brush 6 are both wool.

[0065] Preferably, in step S1, the cleaning liquid is acetone; the radiation includes gamma ray irradiation, and the treatment time is 0.5 h.

[0066] Preferably, in step S2, the coupling agent solution includes 10 parts of water, 700 parts of alcohol, and 5 parts of γ-glycidyloxypropyltrimethoxysilane by mass fraction, and the immersion time is 13 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 120°C and the drying time is 3 hours.

[0067] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 40 parts of cyanate resin, 35 parts of butyl acetate and 1 part of acrylic acid.

[0068] Preferably, in step S4, the adhesive solution includes 580 parts of cyanate ester, 520 parts of solvent and 55 parts of toughening agent by mass fraction; the viscosity of the adhesive solution is in the range of 0.35 mPa·s; wherein the cyanate ester includes tetramethyl bisphenol F type cyanate ester and bisphenol E type cyanate ester; the solvent includes butyl acetate; and the toughening agent includes nitrile rubber.

[0069] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 0.5°C / min.

[0070] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0071] A wave-transmitting aramid paper honeycomb obtained based on the preparation method described above.

[0072] Embodiment 2

[0073] A method for preparing a wave-transmitting aramid paper honeycomb.

[0074] The steps include:

[0075] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; Figure 4 As shown;

[0076] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0077] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0078] S4. The low dielectric constant aramid paper honeycomb is drawn into a dipping device containing a glue solution, and dipping, curing and weighing are performed three times in sequence to obtain a preformed aramid paper honeycomb; wherein, Figure 2 , Figure 3As shown, the dipping device comprises a collecting pool 1 for recovering glue liquid, in which at least one group of corresponding rotatable dipping rollers 3 are sequentially installed; a channel for filling glue liquid is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole;

[0079] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 450% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0080] Preferably, in step S4, the glue discharging brush 2 and the glue dipping roller 3 are arranged at an acute angle of 65°; the glue collecting brush 6 and the glue dipping roller 3 are arranged at an obtuse angle of 145°;

[0081] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0082] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 6 mm, and the material of the glue discharge brush 2 and the glue collection brush 6 are both wool.

[0083] Preferably, in step S1, the cleaning solution includes ethanol; the radiation includes gamma ray irradiation, and the treatment time is 1 hour.

[0084] Preferably, in step S2, the coupling agent solution includes 15 parts of water, 800 parts of alcohol, and 8 parts of γ-glycidyloxypropyltrimethoxysilane, by mass fraction, and the immersion time is 14 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 140°C and the drying time is 4 hours.

[0085] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 50 parts of cyanate resin, 40 parts of butyl acetate and 3 parts of acrylic acid.

[0086] Preferably, in step S4, the adhesive solution includes 600 parts of cyanate ester, 540 parts of solvent and 60 parts of toughening agent by mass fraction; the viscosity of the adhesive solution is in the range of 0.55 mPa·s; wherein the cyanate ester includes bisphenol E type cyanate ester and dicyclopentadiene type cyanate ester; the solvent includes ethyl acetate; and the toughening agent includes acrylic resin.

[0087] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 1°C / min.

[0088] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0089] A wave-transmitting aramid paper honeycomb obtained based on the preparation method described above.

[0090] Comparative Example 1

[0091] A method for preparing aramid paper honeycomb,

[0092] The steps include:

[0093] The aramid paper honeycomb is drawn into a dipping device filled with glue, and is dipped, cured and weighed three times in sequence. After each dipping and curing treatment, the honeycomb is weighed until the weight increases to 450% of the weight of the aramid paper honeycomb, thereby obtaining a composite aramid paper honeycomb.

[0094] like Figure 2 , Figure 3 As shown, the dipping device comprises a collecting pool 1 for recovering glue liquid, in which at least one group of corresponding rotatable dipping rollers 3 are sequentially installed; a channel for filling glue liquid is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole;

[0095] Preferably, the glue discharging brush 2 and the dipping roller 3 are arranged at an acute angle of 65°; the glue collecting brush 6 and the dipping roller 3 are arranged at an obtuse angle of 145°;

[0096] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0097] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 6 mm, and the material of the glue discharge brush 2 and the glue collection brush 6 are both wool.

[0098] Preferably, the adhesive comprises 600 parts of cyanate ester, 540 parts of solvent and 60 parts of toughening agent by mass fraction; the viscosity of the adhesive is in the range of 0.55 mPa·s; wherein the cyanate ester comprises bisphenol E type cyanate ester and dicyclopentadiene type cyanate ester; the solvent comprises ethyl acetate; and the toughening agent comprises acrylic resin.

[0099] Preferably, if Figure 2 As shown, the glue dipping device includes a collecting pool 1 for recovering glue liquid, a heating tube 4 is arranged in the collecting pool 1, the heating tube 4 is electrically connected to the temperature sensor 5, at least one group of corresponding rotatable glue dipping rollers 3 are sequentially installed in the collecting pool 1, a rotating shaft is installed in the glue dipping roller 3, and a rotating motor is installed at the other end of the rotating shaft; a channel for canned glue liquid is opened in the glue dipping roller 3, N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the glue dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole.

[0100] Preferably, the length of the brush 2 is 6 mm, and the material of the brush 2 is wool.

[0101] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 1°C / min.

[0102] Preferably, five cycles of dipping, curing and weighing are performed in sequence.

[0103] A composite aramid paper honeycomb obtained based on the above-mentioned preparation method.

[0104] The difference between Comparative Example 1 and Example 2 is that the aramid paper honeycomb is not subjected to surface hydroxylation treatment and the subsequent condensation-grafting treatment of the hydroxylated aramid paper honeycomb is not performed.

[0105] Embodiment 3

[0106] A method for preparing a wave-transmitting aramid paper honeycomb.

[0107] The steps include:

[0108] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; Figure 4 As shown;

[0109] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0110] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0111] S4. Stretch the low dielectric constant aramid paper honeycomb into a dipping device containing glue, and perform dipping, curing and weighing at least once in sequence to obtain a preformed aramid paper honeycomb; wherein, Figure 2 , Figure 3 As shown, the dipping device comprises a collecting pool 1 for recovering glue liquid, in which at least one group of corresponding rotatable dipping rollers 3 are sequentially installed; a channel for filling glue liquid is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole;

[0112] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 500% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0113] Preferably, in step S4, the glue discharging brush 2 and the glue dipping roller 3 are arranged at an acute angle of 75°; the glue collecting brush 6 and the glue dipping roller 3 are arranged at an obtuse angle of 165°;

[0114] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0115] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 7 mm, and the material of the glue discharge brush 2 and the glue collection brush 6 are both pig bristles.

[0116] Preferably, in step S1, the cleaning solution includes acetone; the radiation includes plasma treatment, and the treatment time is 1 hour.

[0117] Preferably, in step S2, the coupling agent solution includes 20 parts of water, 90 parts of alcohol, and 9 parts of γ-glycidyloxypropyltrimethoxysilane, by mass fraction, and the immersion time is 14 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 140°C and the drying time is 5 hours.

[0118] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 55 parts of cyanate resin, 40 parts of butyl acetate and 4 parts of acrylic acid.

[0119] Preferably, in step S4, the adhesive solution comprises, by mass fraction, 600 parts of cyanate ester, 540 parts of solvent and 60 parts of toughening agent; the viscosity of the adhesive solution is in the range of 0.65 mPa·s; wherein the cyanate ester comprises tetramethyl bisphenol F type cyanate; the solvent comprises ethyl acetate; and the toughening agent comprises nitrile rubber.

[0120] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 1.5°C / min.

[0121] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0122] A wave-transmitting aramid paper honeycomb obtained based on the preparation method described above.

[0123] Embodiment 4

[0124] A method for preparing a wave-transmitting aramid paper honeycomb.

[0125] The steps include:

[0126] S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; Figure 4 As shown;

[0127] S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb;

[0128] S3. The surface epoxy aramid paper honeycomb is immersed in an interface enhancement solution, and the surface epoxy aramid paper honeycomb is subjected to dielectric constant weakening treatment to obtain a low dielectric constant aramid paper honeycomb;

[0129] S4. The low dielectric constant aramid paper honeycomb is drawn into a dipping device containing a glue solution, and dipping, curing and weighing are performed three times in sequence to obtain a preformed aramid paper honeycomb; wherein, Figure 2 , Figure 3 As shown, the dipping device comprises a collecting pool 1 for recovering glue liquid, in which at least one group of corresponding rotatable dipping rollers 3 are sequentially installed; a channel for filling glue liquid is opened in the dipping roller 3, and N columns of glue holes and M columns of glue collecting holes are sequentially opened along the circumference of the outer wall of the dipping roller 3, 2≤N≤3, 2≤M≤3; a glue discharge brush 2 is bonded to the inner wall of each glue discharge hole, and a glue collecting brush 6 is bonded to the inner wall of each glue collecting hole;

[0130] S5. Weigh the preformed aramid paper honeycomb after each dipping and curing treatment, and increase the weight to 550% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb.

[0131] Preferably, in step S4, the glue discharging brush 2 and the glue dipping roller 3 are arranged at an acute angle of 75°; the glue collecting brush 6 and the glue dipping roller 3 are arranged at an obtuse angle of 165°;

[0132] The low dielectric constant aramid paper honeycomb is stretched between the corresponding rotatable dipping rollers 3. When the low dielectric constant aramid paper honeycomb passes through the glue discharging brush 2, the low dielectric constant aramid paper honeycomb is glued and dipped. When the low dielectric constant aramid paper honeycomb passes through the glue collecting brush 6, the residual glue on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller 3 through the glue collecting hole.

[0133] Preferably, in step S4, a heating tube 4 is provided in the collecting pool 1, and the heating tube 4 is electrically connected to a temperature sensor 5; a rotating shaft is installed in the dipping roller 3, and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush 2 and the glue collection brush 6 are both 6 mm, and the material of the glue discharge brush 2 and the glue collection brush 6 are both pig bristles.

[0134] Preferably, in step S1, the cleaning solution includes acetone or ethanol; the radiation includes gamma ray irradiation, and the treatment time is 1 hour.

[0135] Preferably, in step S2, the coupling agent solution includes 25 parts of water, 100 parts of alcohol, and 10 parts of γ-glycidyloxypropyltrimethoxysilane, by mass fraction, and the immersion time is 15 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 150°C and the drying time is 5 hours.

[0136] Preferably, in step S3, the interface enhancement solution comprises, by mass fraction, 60 parts of cyanate resin, 50 parts of butyl acetate and 5 parts of acrylic acid.

[0137] Preferably, in step S4, the adhesive solution includes 620 parts of cyanate ester, 550 parts of solvent and 65 parts of toughening agent by mass fraction; the viscosity of the adhesive solution is in the range of 0.75 mPa·s; wherein the cyanate ester includes dicyclopentadiene cyanate ester; the solvent includes butyl acetate; and the toughening agent includes acrylic resin.

[0138] Preferably, in step S4, the curing process includes: heating to 120°C in stage one, and keeping warm for 1 hour in stage one; heating to 180°C in stage two, and keeping warm for 2 hours in stage two; heating to 200°C in stage three, and keeping warm for 1 hour in stage three; heating to 220°C in stage four, and keeping warm for 1 hour in stage four; the heating rate is 2°C / min.

[0139] Preferably, in step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

[0140] A wave-transmitting aramid paper honeycomb obtained based on the preparation method described above.

[0141] Test Case

[0142] The wave-transmitting aramid paper honeycombs obtained in Examples 1 to 4 and the composite aramid paper honeycombs obtained in Comparative Example 1 were tested to detect parameters such as the weight of the aramid paper honeycombs, the wave-transmitting aramid paper honeycombs, the weight of the composite aramid paper honeycombs, the flat compression strength, the longitudinal shear strength, the transverse shear strength, the dielectric constant, and the dielectric loss tangent. The test results are as follows:

[0143] Table 1 Performance test results of wave-transmitting aramid paper honeycomb / composite aramid paper honeycomb

[0144] Test items Aramid paper honeycomb weight (g) Aramid paper honeycomb for wave transmission (g) Composite aramid paper honeycomb (g) Flat compressive strength (MPa) Longitudinal shear strength (MPa) Transverse shear strength (MPa) Dielectric constant (GHz) Dielectric loss tangent tgδ Embodiment 1 0.5 2.01 4.87 67.8 0.89 1.10～1.30 0.07～0.009 Embodiment 2 0.5 2.21 5.58 93.62 1.892 1.02～1.10 0.003～0.007 Comparative Example 1 0.5 2.2 5.1 67.1 0.66 10～11.2 0.5～0.6 Embodiment 3 0.5 2.5 5.578 80.5 0.99 1.06～1.10 0.005～0.007 Embodiment 4 0.5 2.75 5.02 73.9 1.25 1.09～1.14 0.006～0.008

[0145] It can be seen from Table 1 of the above test examples that the flat compression strength, longitudinal shear strength and transverse shear strength of the wave-transmitting aramid paper honeycombs obtained in Examples 1 to 4 are higher than those of the composite aramid paper honeycombs obtained in Comparative Example 1, while the dielectric constant and dielectric loss tangent of the wave-transmitting aramid paper honeycombs obtained in Examples 1 to 4 are lower than those of the composite aramid paper honeycombs obtained in Comparative Example 1. It can be seen that the mechanical strength of the wave-transmitting aramid paper honeycombs obtained by the preparation method will not decrease. The larger the dielectric loss tangent, the more energy the electromagnetic wave energy is converted into heat and lost in the process of passing through the cover body. On the contrary, the smaller the dielectric loss tangent, the less energy the electromagnetic wave energy is converted into heat and lost in the process of passing through the cover body. The larger the dielectric constant, the greater the reflection of the electromagnetic wave at the interface between the air and the dielectric cover wall, which will increase the mirror lobe level and reduce the transmission efficiency. In order to achieve the purpose of maximum transmission and minimum reflection, the dielectric loss tangent tgδ of the wave-transmitting material is required to be as small as possible, especially close to zero, so the dielectric constant of the wave-transmitting aramid paper honeycomb is as low as possible. Compared with the performance tests of the wave-transmitting aramid paper honeycombs obtained in Examples 1 to 4, the wave-transmitting aramid paper honeycombs obtained by the preparation method of Example 2 have the best performance.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a wave-transmitting aramid paper honeycomb, characterized in that: The steps include: S1. The aramid paper honeycomb is immersed in a cleaning solution for cleaning, the cleaned aramid paper honeycomb is immersed in a 1,4-dichlorobutane solution, and irradiated with radiation, and then the irradiated aramid paper honeycomb is placed in a sodium hydroxide solution for surface hydroxylation to obtain a hydroxylated aramid paper honeycomb; The cleaning solution includes acetone or ethanol; the radiation irradiation includes plasma treatment or gamma ray irradiation, and the treatment time is 0.5h to 1h; S2. Immersing the hydroxylated aramid paper honeycomb in a coupling agent solution, performing condensation-grafting treatment on the hydroxylated aramid paper honeycomb to obtain a surface epoxy aramid paper honeycomb; The coupling agent solution includes 10 to 25 parts of water, 70 to 100 parts of alcohol, and 4 to 10 parts of γ-glycidyloxypropyltrimethoxysilane by mass fraction, and the soaking time is 13 to 15 hours; during the condensation-grafting treatment of the hydroxylated aramid paper bee, the drying temperature is 120 to 150°C, and the drying time is 3 to 5 hours; S3. Immersing the surface epoxy aramid paper honeycomb in an interface enhancement solution, and performing dielectric constant weakening treatment on the surface epoxy aramid paper honeycomb to obtain a low dielectric constant aramid paper honeycomb; S4. The low dielectric constant aramid paper honeycomb is stretched into a dipping device filled with glue, and dipping, curing and weighing are performed at least once in sequence to obtain a preformed aramid paper honeycomb; wherein the dipping device comprises a collecting pool (1) for recovering the glue, and at least one group of corresponding rotatable dipping rollers (3) are sequentially installed in the collecting pool (1); a channel for filling the glue is opened in the dipping roller (3), and N columns of glue holes and M columns of glue collection holes are sequentially opened along the circumference of the outer wall of the dipping roller (3), 2≤N≤3, 2≤M≤3; a glue discharge brush (2) is bonded to the inner wall of each glue discharge hole, and a glue collection brush (6) is bonded to the inner wall of each glue collection hole, and N columns of glue holes and M columns of glue collection holes are sequentially opened along the circumference of the outer wall of the dipping roller (3), 2≤N≤3, 2≤M≤3; a glue discharge brush (2) is bonded to the inner wall of each glue discharge hole, and a glue collection brush (6) is bonded to the inner wall of each glue collection hole; S5. The preformed aramid paper honeycomb is weighed after each dipping and curing treatment, and the weight is increased to 350 to 550% of the weight of the aramid paper honeycomb to obtain a wave-transmitting aramid paper honeycomb; Wherein, in step S4, the glue discharging brush (2) and the glue dipping roller (3) are arranged at an acute angle, the acute angle being 35° to 75°; the glue collecting brush (6) and the glue dipping roller (3) are arranged at an obtuse angle, the obtuse angle being 125° to 165°; The low dielectric constant aramid paper honeycomb is stretched between corresponding rotatable dipping rollers (3); when the low dielectric constant aramid paper honeycomb passes through the glue discharging brush (2), the low dielectric constant aramid paper honeycomb is dipped in glue; when the low dielectric constant aramid paper honeycomb passes through the glue collecting brush (6), the glue liquid remaining on the surface of the low dielectric constant aramid paper honeycomb is recovered and recovered into the channel of the dipping roller (3) through the glue collecting hole; A heating tube (4) is provided in the collecting pool (1), and the heating tube (4) is electrically connected to a temperature sensor (5); a rotating shaft is installed in the dipping roller (3), and a rotating motor is installed at one end of the rotating shaft; the length of the glue discharge brush (2) and the glue collection brush (6) are both 5 to 7 mm, and the material of the glue discharge brush (2) and the glue collection brush (6) are both wool or pig bristles; In step S3, the interface enhancement solution includes, by mass fraction, 40 to 60 parts of cyanate resin, 35 to 50 parts of butyl acetate and 1 to 5 parts of acrylic acid; In step S4, the adhesive solution includes 580 to 620 parts of cyanate ester, 520 to 550 parts of solvent and 55 to 65 parts of toughening agent by mass fraction; the viscosity of the adhesive solution ranges from 0.35 mPa·s to 0.75 mPa·s; wherein the cyanate ester includes at least one of tetramethyl bisphenol F cyanate ester, bisphenol E cyanate ester or dicyclopentadiene cyanate ester; the solvent includes butyl acetate or ethyl acetate; and the toughening agent includes at least one of nitrile rubber or acrylic resin.

2. The preparation method according to claim 1, characterized in that: In step S4, the curing process includes: stage one, heating to 120°C, and the insulation time of stage one is 1 hour; stage two, heating to 180°C, and the insulation time of stage two is 2 hours; stage three, heating to 200°C, and the insulation time of stage three is 1 hour; stage four, heating to 220°C, and the insulation time of stage four is 1 hour; the heating rate is 0.5~2°C / min.

3. The preparation method according to claim 2, characterized in that: In step S4, the low dielectric constant aramid paper honeycomb is immersed in glue solution, and five cycles of dipping, curing and weighing are performed in sequence.

4. A wave-transmitting aramid paper honeycomb obtained by the preparation method according to any one of claims 1 to 3.

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