CN111218076A - Resistive film and preparation method and application thereof - Google Patents
Resistive film and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a resistive film, which comprises the following steps: blending 100 parts of resin, 150-350 parts of solvent, 20-100 parts of dispersant and 100-500 parts of filler to prepare raw pulp, wherein the viscosity of the raw pulp is 30000-100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 mu m; the filler at least comprises a metal magnetic filler and a carbon-based filler; and performing metamaterial simulation design according to the electromagnetic parameters of the raw stock to obtain the optimal design pattern and size of the raw stock, and then performing printing, printing or spraying to obtain the resistive film. The invention provides a composite resistive film with a magnetic wave-absorbing material and an impedance matching adjustment material, which is used for a stealth structural member and can realize adjustable wave-absorbing performance from a low frequency band to a high frequency band. Meanwhile, the wave-absorbing material and the impedance matching material are compounded into a single resistive film structure, so that the thickness of the wave-absorbing material is reduced. The low-weight and wide-band absorption of the wave-absorbing material is integrally realized.
Description
Technical Field
The invention relates to a resistive film, in particular to a resistive film and a preparation method and application thereof.
Background
The metamaterial wave-absorbing structure is a composite wave-absorbing material formed by combining a metamaterial microstructure and a medium substrate, and the wave-absorbing function of the metamaterial is mainly realized by electromagnetic resonance, loading lumped elements or resistive films and the like at present.
At present, the resistive film is made by printing a metamaterial microstructure on a substrate, the design function of the resistive film is single at present, and a plurality of layers of resistive films need to be superposed to realize impedance matching in the assembly of the wave absorber, so that the wave absorber has a broadband wave absorbing effect. The wave-absorbing structure is formed by alternately laminating five layers of PET medium substrates, four layers of resistive films, four layers of light PMI foams, one layer of magnetic wave-absorbing material and one layer of metal. However, different layers need to be prepared in the wave-absorbing structure, and the different layers may be peeled and deformed during storage and use, so that the performance of the wave-absorbing structure is reduced, the preparation process of the wave-absorbing structure is complicated, the time consumption is high, the cost is high, the overall thickness of the wave-absorbing structure is large, and the later maintenance cost is also high.
When the whole thickness of the wave-absorbing material is limited, the wave-absorbing effect is difficult to break through in a wide frequency band by simply adopting a metamaterial wave-absorbing structure with a plurality of layers of resistive films.
Therefore, it is necessary to provide a resistive film having a low thickness and a broad-band wave absorption property.
Disclosure of Invention
The invention aims to provide a resistive film with low thickness and broadband wave absorption performance, and a preparation method and application thereof.
According to a first aspect of the present invention, there is provided a method of preparing a resistive film, comprising: blending 100 parts of resin, 150-350 parts of solvent, 20-100 parts of dispersing agent and 100-500 parts of filler to prepare raw pulp, wherein the viscosity of the raw pulp is 30000-100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 mu m; the filler at least comprises a metal magnetic filler and a carbon-based filler; and performing metamaterial simulation design according to the electromagnetic parameters of the raw stock to obtain the optimal design pattern and size of the raw stock, and then performing printing, printing or spraying to obtain the resistive film.
In the above production method, the resin is selected from one or a combination of more of acrylic resin, epoxy resin, silicone rubber, silicone resin, butyral resin, urethane resin, hexene-vinyl acetate resin, vinyl chloride-vinyl acetate resin, or phenol resin; the dispersing agent is one or a combination of more of N, N-dimethylformamide, BYK-9076, sodium dodecyl benzene sulfonate, a silane coupling agent, methyl cellulose and BYK-180.
The raw stock also comprises a curing agent matched with the resin, and it is noted that in the technical scheme of the invention, the curing agent is mixed in the resin. Of course, in other embodiments, the curing agent may be added separately during the step of preparing the virgin stock.
The wave-absorbing structural member is manufactured by requiring that the resistive film has stealth and strength requirements, the compatibility of a resin system to metal magnetic fillers and carbon fillers is fully considered in the process of preparing the primary pulp, otherwise, the mechanical property of the wave-absorbing structural member is poor in strength test. When the resin type is selected, the matching between the metal magnetic filler, the carbon-based filler and the resin, the dispersing agent and the solvent needs to be considered, so that the raw stock with high filler content can be obtained, and the increase of the filler content is an important precondition for realizing the broadband wave-absorbing resistive film. In the invention, the resin is selected, so that the compatibility of the filler can be ensured, and the high cohesive force is realized. The metal magnetic filler in the primary pulp has high specific gravity, weak liquid absorption capacity and large particle size; the carbon series filler has small specific gravity, strong liquid absorption capacity and easy agglomeration, and the solvent and the dispersant selected in the invention have strong dispersion effect on the metal magnetic filler and the carbon series filler.
In the preparation method, the primary pulp also comprises a curing agent matched with the resin.
In the above preparation method, the solvent is selected from one or more of ethyl acetate, butyl acetate, methyl nylon acid, diisobutyl nylon acid, cyclohexanone, methanol, ethanol, methyl ethyl ketone, acetone, isophorone, butanol, and isobutanol.
In the above preparation method, the metal magnetic filler is selected from one or more of carbonyl iron, carbonyl iron nickel alloy and carbonyl iron nickel chromium alloy, the carbon-based filler is selected from one or more of carbon nanotube, graphene, graphite and carbon black, and the ratio of the mass parts of the metal magnetic filler to the carbon-based filler is 100:1-75, such as 100:70, 100:60, 100:50, 100:40, 100:30, 100:20, 100:10, 100:4, 100:3 and 100: 2.
In the preparation method, the particle size of the metal magnetic filler is 1-10 microns, and the particle size of the carbon-based filler is 20 nanometers-10 microns.
In the above preparation method, the ratio of the mass parts of the filler to the dispersant is 100:20 to 100, such as 100:90, 100:80, 100:75, 100:70, 100:60, 100:40, 100:30, 100: 20.
In the preparation method, the obtaining of the primary pulp comprises the following steps: firstly, adding a solvent at least comprising methyl nylon carboxylate into resin, and stirring until the solvent is completely dissolved to obtain a resin mixture; adding a dispersing agent into the resin mixture and uniformly stirring to obtain a resin solution; adding the filler to the resin solution; adding the mixture of the filler and the resin solution into a stirrer, setting the stirring speed between 400 and 600rpm, and stirring for 5 to 15 minutes; and then increasing the speed to 800-1200rpm, stirring for 10-20 minutes, then transferring to a three-roller machine, grinding for 2-3 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 20-40 minutes after grinding, and repeating the operation for 2-5 times until the particle size of the primary pulp is less than 10 microns. The methyl nylon carboxylate and isophorone are selected in the solvent, so that the interfacial property of the resin and the filler can be improved, and the good solubility of the resin in the solvent is ensured, so that the raw pulp with high filler content can be obtained. Wherein when methyl nylon ate and isophorone are selected as solvents, the mass portion ratio of the resin, the methyl nylon ate and the isophorone is 20-70:20-100: 1-20.
Of course, the process sequence for preparing the raw syrup specifically described herein is not limited thereto, and additional operations may be added before, after, or otherwise, the steps of the method may be rearranged or performed in a different order. For example, the solvent may be first mixed with the dispersant, then the filler and resin added thereto and blended by a blender, milled to the desired particle size of the virgin pulp by a three roll mill and a sand mill. Alternatively, the filler is first added to the solvent, then the resin, and finally the dispersant, and then blended by a blender, ground by a three roll mill, and a sand mill to the desired particle size of the virgin pulp. Or adding part or all of the metal magnetic filler into the resin, adding part or all of the carbon-based filler into the solvent, adding the dispersant and the rest of the metal magnetic filler and the carbon-based filler, blending by a stirrer, and grinding to the required particle size of the virgin stock by a three-roll mill and a sand mill.
According to another aspect of the invention, the resistive film prepared by the preparation method is also provided.
According to the invention, the application of the resistance film in the wave-absorbing material or the wave-absorbing structural member of weaponry including airplanes, missiles, tanks, naval vessels and warehouses and military facilities is also provided.
In the invention, the metal magnetic filler and the carbon filler are simultaneously used as the raw materials of the resistive film, and the metal magnetic filler and the carbon filler have relatively long differences in density, electromagnetic property, surface property and the like, so that the compatibility and matching of the metal magnetic filler and the carbon filler are considered in the process of preparing the virgin stock for the resistive film, and the printability and the flowability of the virgin stock at the later stage are considered.
In the invention, the metal magnetic filler and the carbon filler are simultaneously used in the raw material of the resistive film, wherein the metal magnetic filler can realize the adjustment of the broadband wave absorption performance, and the carbon filler realizes different impedance matching in the wave absorption performance, thereby integrally achieving the matching of the broadband wave absorption performance; because the wave-absorbing performance and the impedance matching performance are integrated into the resistive film structure, the thickness of the wave-absorbing structural member is greatly reduced, and the weight of the wave-absorbing structural member is reduced.
The invention provides a composite resistive film with a magnetic wave-absorbing material and an impedance matching adjusting material, which is used for a stealth structural member and can realize the adjustment of low-frequency to high-frequency broadband wave-absorbing performance. The low weight and wide frequency band absorption of the wave-absorbing material are integrally realized.
The invention can be applied to wave-absorbing structural members in various weaponry such as airplanes, missiles, tanks, naval vessels, warehouses and the like and military facilities, can realize good wave-absorbing effect of the wave-absorbing structural members in a wide frequency band of 0.1GHz-18GHz on one hand, and integrates the magnetic wave-absorbing performance and the impedance matching performance into a resistive film on the other hand, thereby realizing the low weight and the thickness reduction of the wave-absorbing structural members.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The invention provides a preparation method of a resistive film with low thickness and broadband wave absorption performance, which comprises the following steps:
blending 100 parts of resin, 150-350 parts of solvent, 20-100 parts of dispersant and 100-500 parts of filler to prepare raw pulp, wherein the viscosity of the raw pulp is 30000-100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 μm. Wherein, the resin is selected from one or more of acrylic resin, epoxy resin, silicon rubber, silicon resin, butyral resin, polyurethane resin, vinyl acetate-vinyl acetate resin, vinyl chloride-vinyl acetate resin or phenolic resin; the dispersing agent is one or a combination of more of N, N-dimethylformamide, BYK-9076, sodium dodecyl benzene sulfonate, a silane coupling agent, methylcellulose and BYK-180. The solvent is selected from one or more of ethyl acetate, butyl acetate, methyl nylon acid ester, diisobutyl nylon acid ester, cyclohexanone, methanol, ethanol, methyl ethyl ketone, acetone, isophorone, butanol and isobutanol. The mass portion ratio of the filler to the dispersant is 100: 20-100. The filler includes at least a metal magnetic filler and a carbon-based filler. The metal magnetic filler is selected from one or more of carbonyl iron, carbonyl iron-nickel alloy and carbonyl iron-nickel-chromium alloy, the carbon filler is selected from one or more of carbon nano tube, graphene, graphite and carbon black, and the mass part ratio of the metal magnetic filler to the carbon filler is 100: 1-75. The grain diameter of the metal magnetic filler is 1-10 microns, and the grain diameter of the carbon filler is 20 nanometers-10 microns.
Preferably, the obtaining of the puree comprises: firstly, adding a solvent at least comprising methyl nylon carboxylate into the resin, and stirring until the solvent is completely dissolved to obtain a resin mixture; adding a cosolvent and a dispersant into the resin mixture in sequence, and uniformly stirring to obtain a resin solution; adding the filler to the resin solution; adding the mixture of the filler and the resin solution into a stirrer, setting the stirring speed between 400 and 600rpm, and stirring for 5 to 15 minutes; and then increasing the speed to 800-1200rpm, stirring for 10-20 minutes, then transferring to a three-roller machine, grinding for 2-3 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 20-40 minutes after grinding, and repeating for 3-5 times until the particle size of the primary pulp is less than 10 microns.
And then carrying out metamaterial simulation design according to the electromagnetic parameters of the raw stock to obtain the optimal design pattern and size of the raw stock, and then carrying out printing, printing or spraying to obtain the resistive film.
In the invention, metal magnetic fillers such as carbonyl iron, carbonyl iron-nickel alloy, carbonyl carbon and iron-nickel-chromium alloy and carbon fillers such as carbon nano tubes, graphene, graphite and carbon black are simultaneously used in the raw materials of the resistive film, wherein the metal magnetic fillers can realize the adjustment of the broadband wave absorption performance, and the carbon fillers realize different impedance matching in the wave absorption performance, so that the matching of the broadband wave absorption performance is integrally realized; because the wave-absorbing performance and the impedance matching performance are integrated into the resistive film structure, the thickness of the wave-absorbing structural member is greatly reduced, and the weight of the wave-absorbing structural member is reduced.
Example 1
Accurately weighing 50g of nylon acid methyl ester (DBE) and 6g of ethyl acetate, mixing in a straight bottle, adding 20g of acrylic resin, and stirring for 5min until the mixture is completely dissolved and no block exists; then, mixing the resin DBE, the isophorone and the ethyl acetate according to the proportion of 10:25:4: 3; adding isophorone and N, N-dimethylformamide into a dispersing agent N, N-dimethylformamide and a filler in a ratio of 1:5 in sequence, and stirring for 5min until the solution is clear and transparent and has no white lumps, so as to obtain a uniform resin solution.
100g of filler (containing 96g of carbonyl iron-nickel alloy and 4g of carbon nanotubes) was added to the resin solution, and mixed with stirring until the liquid was able to flow by tilting the straight bottle. Starting the stirrer, setting the stirring speed at 500rpm, stirring for 10min, and observing that the primary pulp in the dispersion tank flows along with the rotation of the dispersion plate and no solid is adhered to the wall of the dispersion tank; and then increasing the speed to 1000rpm, stirring for 15min, then transferring to a three-roller machine, grinding for 2 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 20min after grinding, and repeating the operation for 5 times until the particle size of the raw stock is less than 10 microns to obtain the raw stock.
Use rotational viscometer to measure magma viscosity, test the magma fineness with the scraper blade fineness appearance, the magma needs to satisfy: the viscosity ranges from 30000 to 100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 μm.
And performing primary pulp printing according to the pattern of the metamaterial simulation design by adopting a screen printing process to obtain the resistive film. And testing the thickness and the resistance value of the resistance film after printing. And the resistance film is spread in a structural member as a sandwich structure, and the performance of the resistance film is evaluated according to the wave-absorbing performance of the final structural member.
Example 2
Accurately weighing 100g of nylon acid methyl ester (DBE) and 20g of ethyl acetate, mixing in a straight bottle, adding 70g of butyral resin, and stirring for 5min until complete dissolution and no block; then, mixing the resin DBE, the isophorone and the ethyl acetate in a ratio of 7:10:2: 2; adding isofluranone and BYK-9076 into a dispersant BYK-9076 in sequence, wherein the filler is 1:3, and stirring for 80min until the solution is clear and transparent and has no white lumps, so as to obtain a resin solution.
210g of filler (containing 200 carbonyl iron and 10g of three-dimensional graphene) was added to the resin solution, and mixed with stirring until the liquid was able to flow by tilting the straight bottle. Starting the stirrer, setting the stirring speed at 400rpm, stirring for 15min, and observing that the primary pulp in the dispersion tank flows along with the rotation of the dispersion plate and no solid is adhered to the wall of the dispersion tank; and then increasing the speed to 1000rpm, stirring for 20min, then transferring to a three-roller machine, grinding for 3 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 40 min after grinding, and repeating the operation for 3 times until the particle size of the raw stock is less than 10 microns to obtain the raw stock.
The viscosity of the raw stock is measured by a rotational viscometer, and the fineness of the raw stock is measured by a scraper fineness meter. The primary pulp for silk screen printing needs to meet the following requirements: the viscosity ranges from 30000 to 100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 μm. And printing the resistive film according to the pattern designed by the metamaterial simulation by adopting a screen printing process. And testing the thickness and the resistance value of the resistance film after printing. And the resistance film is spread in a structural member as a sandwich structure, and the performance of the resistance film is evaluated according to the wave-absorbing performance of the final structural member.
Example 3
Accurately weighing 50g of nylon acid methyl ester (DBE) and 6g of ethyl acetate, mixing in a straight bottle, adding 20g of vinyl chloride-vinyl acetate resin, and stirring for 5min until the mixture is completely dissolved and has no block; then, mixing the resin DBE, the isophorone and the ethyl acetate according to the proportion of 10:25:4: 3; adding isoflurane and sodium dodecyl benzene sulfonate into dispersant sodium dodecyl benzene sulfonate and filler 2:5 in sequence, and stirring for 10min until the solution is clear and transparent and has no white lumps to obtain the resin solution.
50g of filler (containing 30g of carbonyl iron nickel chromium alloy and 20g of carbon black) was added to the resin solution and mixed with stirring until the liquid was able to flow by tilting the straight bottle. Starting the stirrer, setting the stirring speed at 600rpm, stirring for 5min, and observing that the primary pulp in the dispersion tank flows along with the rotation of the dispersion plate and no solid is adhered to the wall of the dispersion tank; and then increasing the speed to 1200rpm, stirring for 15min, then transferring to a three-roller machine, grinding for 2 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 30min after grinding, and repeating the operation for 4 times until the particle size of the raw stock is less than 10 microns to obtain the raw stock.
The viscosity of the raw stock is measured by a rotational viscometer, and the fineness of the raw stock is measured by a scraper fineness meter. The primary pulp for silk screen printing needs to meet the following requirements: the viscosity ranges from 30000 to 100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 μm. And printing the resistive film according to the pattern designed by the metamaterial simulation by adopting a screen printing process. And testing the thickness and the resistance value of the resistance film after printing. And the resistance film is spread in a structural member as a sandwich structure, and the performance of the resistance film is evaluated according to the wave-absorbing performance of the final structural member.
Example 4
Accurately weighing 56g of ethyl acetate, mixing in a straight bottle, adding 20g of acrylic resin, and stirring for 5min until the mixture is completely dissolved and no block exists; then the resin is isophorone and ethyl acetate which are mixed according to the proportion of 10:4: 28; adding isophorone and N, N-dimethylformamide into a dispersing agent N, N-dimethylformamide and a filler in a ratio of 1:5 in sequence, and stirring for 5min until the solution is clear and transparent and has no white lumps to obtain a resin solution.
20g of filler (containing 18g of carbonyl iron-nickel alloy and 2g of carbon nanotubes) was added to the resin solution and mixed with stirring until the liquid was able to flow by tilting the straight bottle. Starting the stirrer, setting the stirring speed at 500rpm, stirring for 10min, and observing that the primary pulp in the dispersion tank flows along with the rotation of the dispersion plate and no solid is adhered to the wall of the dispersion tank; and then increasing the speed to 1000rpm, stirring for 15min, then transferring to a three-roller machine, grinding for 2 times by the three-roller machine, then transferring to a sand mill for grinding, cooling for 20min after grinding, and repeating the operation for 5 times until the particle size of the raw stock is less than 10 microns to obtain the raw stock.
Use rotational viscometer to measure magma viscosity, test the magma fineness with the scraper blade fineness appearance, the magma needs to satisfy: the viscosity ranges from 30000 to 100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 μm.
And performing primary pulp printing according to the pattern of the metamaterial simulation design by adopting a screen printing process to obtain the resistive film. And testing the thickness and the resistance value of the resistance film after printing. And the resistance film is spread in a structural member as a sandwich structure, and the performance of the resistance film is evaluated according to the wave-absorbing performance of the final structural member.
And (3) performance testing:
the dielectric constant, magnetic permeability and wave-absorbing property of the raw stock prepared in examples 1-4 were measured by the coaxial ring method, and the test results are shown in table 1.
The coaxial ring method comprises the following specific operation steps: heating and curing the raw stock in an oven at 100 deg.C, drying for 30min, removing solvent from the raw stock, grinding the cured coating, and sieving to obtain powder. After the powder and the paraffin are uniformly mixed according to the mass ratio of 7:3, putting the mixture into a die to be pressed into a circular ring with the inner diameter of 3mm and the outer diameter of 7 mm. And placing the circular ring into the waveguide cavity to test the electromagnetic parameters of the filler.
The wave-absorbing bandwidth, wave-absorbing peak value and structure thickness of the structure in examples 1-4 were measured by the arch field, and the test results are shown in table 2.
The specific operation steps of the arch field are as follows: the preparation method comprises the steps of taking the resistive film as a middle interlayer, manufacturing a flat plate with a certain thickness of 400mm multiplied by 400mm, placing the flat plate in a microwave dark room, testing the reflectivity of the flat plate in a frequency range of 0.1-18GHz, and obtaining the wave absorbing performance of the filler through calculation.
The test results were as follows:
TABLE 1
TABLE 2
By comparing examples 1-4 above, it can be seen that:
(1) the metal magnetic filler such as carbonyl iron, carbonyl iron-nickel alloy and carbonyl iron-nickel-chromium alloy and the carbon filler such as carbon nano tube, graphene and carbon black are simultaneously used in the raw materials of the resistive film, wherein the metal magnetic filler can realize the adjustment of the broadband wave absorption performance, and the carbon filler realizes different impedance matching in the wave absorption performance, so that the matching of the broadband wave absorption performance is integrally achieved;
(2) because the wave-absorbing performance and the impedance matching performance are integrated into the resistive film structure, the thickness of the wave-absorbing structural member is greatly reduced, and the weight of the wave-absorbing structural member is reduced.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing a resistive film, comprising:
blending 100 parts of resin, 150-350 parts of solvent, 20-100 parts of dispersing agent and 100-500 parts of filler to prepare raw pulp, wherein the viscosity of the raw pulp is 30000-100000 mPa.s; the thixotropy breaking coefficient is below 80000; the fineness is below 10 mu m;
the filler at least comprises a metal magnetic filler and a carbon-based filler;
and performing metamaterial simulation design according to the electromagnetic parameters of the raw stock to obtain the optimal design pattern and size of the raw stock, and then performing printing, printing or spraying to obtain the resistive film.
2. The method according to claim 1, wherein the resin is selected from one or more of acrylic resin, epoxy resin, silicone rubber, silicone resin, butyral resin, urethane resin, vinyl acetate-vinyl acetate resin, vinyl chloride-vinyl acetate resin, and phenol resin; the dispersing agent is one or a combination of more of N, N-dimethylformamide, BYK-9076, sodium dodecyl benzene sulfonate, a silane coupling agent, methyl cellulose and BYK-180.
3. The method of claim 1, wherein the syrup further comprises a curing agent compatible with the resin.
4. The preparation method according to claim 1, wherein the solvent is selected from one or more of ethyl acetate, butyl acetate, methyl nylon acid ester, diisobutyl nylon acid ester, cyclohexanone, methanol, ethanol, methyl ethyl ketone, acetone, isophorone, butanol and isobutanol.
5. The preparation method according to claim 1, wherein the metal magnetic filler is selected from one or more of carbonyl iron, carbonyl iron-nickel alloy and carbonyl iron-nickel-chromium alloy, the carbon-based filler is selected from one or more of carbon nanotubes, graphene, graphite and carbon black, and the ratio of the mass parts of the metal magnetic filler to the mass parts of the carbon-based filler is 100: 1-75.
6. The production method according to claim 1, wherein the metal magnetic filler has a particle size of 1 to 10 μm, and the carbon-based filler has a particle size of 20 nm to 10 μm.
7. The production method according to claim 1, wherein the ratio of the mass parts of the filler to the dispersant is 100:20 to 100.
8. The method of claim 4, wherein obtaining the raw stock comprises:
firstly, adding a solvent at least comprising methyl nylon carboxylate into the resin, and stirring until the solvent is completely dissolved to obtain a resin mixture;
sequentially adding a dispersing agent into the resin mixture and uniformly stirring to obtain a resin solution;
adding the filler to the resin solution;
adding the mixture of the filler and the resin solution into a stirrer, uniformly mixing, and then grinding until the particle size of the primary pulp is less than 10 mu m.
9. An electrically resistive film prepared by the preparation method according to any one of claims 1 to 8.
10. Use of the resistive film according to claim 9 in a wave absorbing material or a wave absorbing structure of weaponry including airplanes, missiles, tanks, naval vessels, warehouses and military installations.
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| CN116200120A (en) * | 2023-03-14 | 2023-06-02 | 东莞市雷兹盾电子材料有限公司 | Composite wave-absorbing sizing material and preparation method thereof |
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| CN101735501A (en) * | 2008-11-20 | 2010-06-16 | 宁波山泉建材有限公司 | Composite material with radar absorbing function and preparation method |
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