CN111270529A - Light high-elasticity wave-absorbing material and preparation method thereof - Google Patents
Light high-elasticity wave-absorbing material and preparation method thereof Download PDFInfo
- Publication number
- CN111270529A CN111270529A CN201811482149.2A CN201811482149A CN111270529A CN 111270529 A CN111270529 A CN 111270529A CN 201811482149 A CN201811482149 A CN 201811482149A CN 111270529 A CN111270529 A CN 111270529A
- Authority
- CN
- China
- Prior art keywords
- wave
- flexible
- absorbing
- weight
- layer
- 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
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/83—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with metals; with metal-generating compounds, e.g. metal carbonyls; Reduction of metal compounds on textiles
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
- F41H3/02—Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structure
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/04—Properties of the materials having electrical or magnetic properties
- D06N2209/048—Electromagnetic interference shielding
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1635—Elasticity
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a light high-elasticity wave-absorbing material and a preparation method thereof. The light high-elasticity wave-absorbing material comprises a substrate layer and a flexible wave-absorbing layer which are sequentially arranged, wherein the flexible wave-absorbing layer comprises water resin, wave-absorbing filler, organic wetting dispersant and deionized water. By applying the technical scheme of the invention, the water-based resin, the flexible fabric and the like are adopted, the environment-friendly wave-absorbing material with low surface density, high elasticity and zero pollution is developed, the elasticity of the wave-absorbing material is greatly improved, and the application range of the wave-absorbing material is expanded; the wave-absorbing material can be applied to radar stealth of equipment, can obviously improve the stealth performance of target equipment under a high-frequency radar, can be directly coated on the surface of the equipment, and can be made into stealth tarpaulin, car clothing, tent and the like for ground target stealth camouflage as the wave-absorbing material can be used for a flexible base material.
Description
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to a light high-elasticity wave-absorbing material and a preparation method thereof.
Background
The wave-absorbing material is a functional material which can effectively absorb incident electromagnetic waves, convert electromagnetic energy into heat energy and consume or enable the interference of the electromagnetic waves to be cancelled, and therefore the echo intensity of a target is obviously weakened. The absorbing material has very important application value in both military and civil fields. According to the wave-absorbing mechanism, wave-absorbing materials are classified into magnetic loss, dielectric loss and conductive loss types. The weapon equipment is covered with the wave-absorbing material, so that the radar wave can be absorbed, the reflected signal can be attenuated, the method is an effective means for anti-radar detection, and the method is a method for reducing the possibility that the weapon equipment is hit by missiles and laser weapons.
The existing wave-absorbing material generally adopts an oily system, a large amount of organic solvent is generated in the production and construction process to pollute the environment, the oily system coating is generally higher in hardness, small in elasticity and large in surface density, and high-elasticity resin is fewer in variety and high in price; the material of the scheme can only be applied to hard substrates, and the use is greatly limited.
Disclosure of Invention
The invention aims to provide a light high-elasticity wave-absorbing material and a preparation method thereof, and aims to solve the technical problem that the use of the wave-absorbing material with higher hardness is greatly limited in the prior art.
In order to achieve the above object, according to one aspect of the present invention, a light-weight high-elasticity wave-absorbing material is provided. The light high-elasticity wave-absorbing material comprises a substrate layer and a flexible wave-absorbing layer which are sequentially arranged, wherein the flexible wave-absorbing layer comprises water resin, wave-absorbing filler, organic wetting dispersant and deionized water.
Further, the flexible wave absorbing layer comprises 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water.
Further, the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, the flexible wave-absorbing layer is also provided with a flexible metal coating; preferably, the flexible metal coating comprises an aqueous resin, a sheet metal paste and deionized water.
Further, the flexible metal coating comprises 60-85 parts by weight of water-based resin, 10-20 parts by weight of sheet metal paste and 5-10 parts by weight of deionized water; preferably, the thickness of the flexible metal coating is 40 μm to 80 μm.
Further, the aqueous resin is one or more selected from the group consisting of an aqueous polyurethane dispersion, an aqueous polyurethane emulsion, and an aqueous epoxy resin.
Further, the wave-absorbing filler is selected from one or more of the group consisting of highly conductive carbon black, highly conductive graphite, chopped carbon fiber and chopped stainless steel fiber.
Further, the organic wetting dispersant is one or more of dispersant WS4000, dispersant Tego 760W and dispersant BYK-190.
Furthermore, the thickness of the flexible wave-absorbing layer is 0.5-0.6 mm.
According to another aspect of the invention, a preparation method of the light high-elasticity wave-absorbing material is provided. The preparation method comprises the following steps: s1, respectively weighing water-based resin, wave-absorbing filler, organic wetting dispersant and deionized water, and grinding and wetting by using a dispersion machine to prepare flexible wave-absorbing layer slurry; and S2, spraying the treatment liquid on the substrate layer, and then arranging the flexible wave absorbing layer on the substrate layer.
Further, the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, the preparation method further comprises the step of arranging a flexible metal coating on the flexible wave-absorbing layer; preferably, the flexible metal coating is prepared by using a flexible metal coating slurry, and the preparation of the flexible metal coating slurry comprises the following steps: respectively weighing the water-based resin, the flaky metal slurry and the deionized water, stirring and dispersing to obtain the flexible metal coating slurry.
Further, S1 specifically includes: respectively weighing 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave-absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water; adding zirconium beads with the particle size of 1.0-2.0 mm serving as a grinding medium into a high-speed dispersion machine, stirring at 500-800 rpm for 0.5h to preliminarily wet each component, stirring at 2000-2500 rpm for 3h, testing the fineness of slurry by using a scraper fineness meter to be less than or equal to 10 microns, and introducing cooling water into a dispersion tank during stirring; sealing the dispersed materials, and standing for 12h at room temperature for later use.
Further, the preparation of the flexible metal coating slurry specifically comprises: 60-85 parts by weight of water-based resin, 10-20 parts by weight of flaky metal paste and 5-10 parts by weight of deionized water are respectively weighed, stirred and dispersed to prepare the flexible metal coating paste.
Further, the treatment liquid is one or more selected from the group consisting of ethanol, a silane coupling agent KH550/560, polyvinyl alcohol, or polyacrylamide.
Further, when the substrate layer is a flexible fabric layer, the preparation method specifically comprises the following steps: spraying a treatment liquid on the flexible fabric layer; and then spraying the flexible wave-absorbing layer slurry on a flexible fabric layer, controlling the thickness to be 0.5-0.6 mm, after the surface of the coating is dried, spraying a layer of flexible metal coating slurry, controlling the thickness to be 40-80 microns, and baking for 0.5-1 h at 45-50 ℃ to obtain the light high-elasticity wave-absorbing material.
According to another aspect of the invention, the application of the light high-elasticity wave-absorbing material in stealth camouflage of radar stealths, stealth tarpaulins, stealth car covers and stealth tents is provided.
By applying the technical scheme of the invention, the water-based resin, the flexible fabric and the like are adopted, the environment-friendly wave-absorbing material with low surface density, high elasticity and zero pollution is developed, the elasticity of the wave-absorbing material is greatly improved, and the application range of the wave-absorbing material is expanded; the wave-absorbing material can be applied to radar stealth of equipment, can obviously improve the stealth performance of target equipment under a high-frequency radar, can be directly coated on the surface of the equipment, and can be made into stealth tarpaulin, car clothing, tent and the like for ground target stealth camouflage as the wave-absorbing material can be used for a flexible base material.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
figure 1 shows a schematic structural diagram of a light-weight high-elasticity wave-absorbing material of example 1;
FIG. 2 is a high-frequency wave-absorbing performance test result chart of the light high-elasticity wave-absorbing material prepared in example 1; and
fig. 3 shows a high-frequency wave-absorbing performance test result diagram of the light high-elasticity wave-absorbing material prepared in example 2.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
According to an exemplary embodiment of the present invention, a light-weight high-elasticity wave-absorbing material is provided. The light high-elasticity wave-absorbing material comprises a substrate layer and a flexible wave-absorbing layer which are sequentially arranged, wherein the flexible wave-absorbing layer comprises water resin, wave-absorbing filler, organic wetting dispersant and deionized water.
By applying the technical scheme of the invention, the water-based resin, the flexible fabric and the like are adopted, the environment-friendly wave-absorbing material with low surface density, high elasticity and zero pollution is developed, the elasticity of the wave-absorbing material is greatly improved, and the application range of the wave-absorbing material is expanded; the wave-absorbing material can be applied to radar stealth of equipment, can obviously improve the stealth performance of target equipment under a high-frequency radar, can be directly coated on the surface of the equipment, and can be made into stealth tarpaulin, car clothing, tent and the like for ground target stealth camouflage as the wave-absorbing material can be used for a flexible base material.
Preferably, the flexible wave absorbing layer comprises 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water. Within the proportion range, the comprehensive performance of the wave-absorbing material can be greatly improved.
According to a typical embodiment of the invention, the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, the flexible wave-absorbing layer is also provided with a flexible metal coating; preferably, the flexible metal coating comprises an aqueous resin, a sheet metal paste and deionized water. Preferably, the flexible metal coating comprises 60-85 parts by weight of water-based resin, 10-20 parts by weight of sheet metal paste and 5-10 parts by weight of deionized water.
According to a typical embodiment of the present invention, the aqueous resin is one or more selected from the group consisting of an aqueous polyurethane dispersion, an aqueous polyurethane emulsion and an aqueous epoxy resin, and these aqueous resins have good elasticity and little contamination.
According to a typical embodiment of the present invention, the wave-absorbing filler is one or more selected from the group consisting of highly conductive carbon black, highly conductive graphite, chopped carbon fiber, and chopped stainless steel fiber, and these wave-absorbing fillers have good wave-absorbing properties and do not affect the overall properties of the flexible wave-absorbing layer, such as flexibility.
Preferably, the organic wetting dispersant is one or more of dispersant WS4000, dispersant Tego 760W and dispersant BYK-190. The thicknesses of the flexible wave-absorbing layer and the flexible metal coating can be set according to actual requirements, preferably, the thickness of the flexible wave-absorbing layer is 0.5-0.6 mm, and the thickness of the flexible metal coating is 40-80 mu m, so that the flexibility and the wave-absorbing performance of the flexible wave-absorbing layer are ensured.
According to a typical embodiment of the invention, a preparation method of a light high-elasticity wave-absorbing material is provided. The preparation method comprises the following steps: s1, respectively weighing water-based resin, wave-absorbing filler, organic wetting dispersant and deionized water, and grinding and wetting by using a dispersion machine to prepare flexible wave-absorbing layer slurry; and S2, spraying the treatment liquid on the substrate layer, and then arranging the flexible wave absorbing layer on the substrate layer. The treatment liquid can adopt the conventional treatment liquid in the field to treat the burrs on the surface of the fabric and enhance the adhesion between the fabric and the coating.
According to a typical embodiment of the invention, the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, the preparation method further comprises the steps of arranging a flexible metal coating on the flexible wave-absorbing layer; preferably, the flexible metal coating is prepared by using a flexible metal coating slurry, and the preparation of the flexible metal coating slurry comprises the following steps: respectively weighing the water-based resin, the flaky metal slurry and the deionized water, stirring and dispersing to obtain the flexible metal coating slurry.
Preferably, S1 specifically includes: respectively weighing 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave-absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water; adding zirconium beads with the particle size of 1.0-2.0 mm serving as a grinding medium into a high-speed dispersion machine, stirring at 500-800 rpm for 0.5h to preliminarily wet each component, stirring at 2000-2500 rpm for 3h, testing the fineness of slurry by using a scraper fineness meter to be less than or equal to 10 microns, and introducing cooling water into a dispersion tank during stirring; sealing the dispersed materials, and standing for 12h at room temperature for later use.
Preferably, the preparation of the flexible metal coating slurry specifically comprises: 60-85 parts by weight of water-based resin, 10-20 parts by weight of flaky metal paste and 5-10 parts by weight of deionized water are respectively weighed, stirred and dispersed to prepare the flexible metal coating paste.
Preferably, the treatment liquid is one or more selected from the group consisting of ethanol, a silane coupling agent KH550/560, polyvinyl alcohol, or polyacrylamide.
Preferably, when the substrate layer is a flexible fabric layer, the preparation method specifically comprises: spraying a treatment liquid on the flexible fabric layer; and then spraying the flexible wave-absorbing layer slurry on a flexible fabric layer, controlling the thickness to be 0.5-0.6 mm, after the surface of the coating is dried, spraying a layer of flexible metal coating slurry, controlling the thickness to be 40-80 microns, and baking for 0.5-1 h at 45-50 ℃ to obtain the light high-elasticity wave-absorbing material.
According to a typical embodiment of the invention, the application of the light high-elasticity wave-absorbing material in stealth camouflage of radar stealth, stealth tarpaulin, stealth car clothing and stealth tent is provided.
In addition, the construction mode of the material is not limited to spraying, rolling or brushing, and the material can also be used as slurry for dipping or coating on the fabric to prepare the flexible wave-absorbing fabric
The following examples are provided to further illustrate the advantageous effects of the present invention. Technical means not described in detail in the following examples may be implemented by technical means described in the detailed description of the invention or conventional in the art.
Example 1
In the embodiment, the light and high-elasticity wave-absorbing material is prepared by taking a flexible fabric as a base material, and the basic process structure is shown in fig. 1, wherein the bottommost layer is a flexible metal coating 30, the middle layer is a flexible wave-absorbing coating 20, and the uppermost layer is a flexible fabric layer 10 (which can be camouflage fabric and the like).
The preparation steps are as follows:
the water-based polyurethane dispersion liquid is 60 parts, the high-conductivity carbon black wave-absorbing filler is 20 parts, the WS4000 is added with 5 parts, and the deionized water is 15 parts.
Adding 1.2Kg of zirconium beads with the particle size of 2mm as grinding media into a laboratory high-speed dispersion machine, stirring at 500rpm for 0.5h to preliminarily wet each component, stirring at 2100rpm for 3h, testing the fineness of the slurry by a scraper blade fineness gauge to be less than or equal to 10um, and introducing cooling water into a dispersion tank during stirring to prevent the temperature of the slurry from being too high; sealing the dispersed materials, and standing for 12h at room temperature for later use.
Cutting the flexible fabric by 320mm x 320mm, fixing the fabric on a flat plate with the reverse side facing upwards, purging the fabric by using a spray gun, and spraying a layer of polyvinyl alcohol;
and (2) spraying a proper amount of prepared wave-absorbing slurry on a fabric, controlling the thickness to be 0.6mm, spraying a flexible metal layer (preparing slurry for preparing a flexible metal coating, namely weighing 75 parts of water-based resin, 20 parts of sheet metal slurry and 5 parts of deionized water, stirring and dispersing uniformly for later use) after the surface of the coating is dried, controlling the thickness to be 40-80 mu m, and baking the coating at 50 ℃ for 0.5h to obtain the flexible composite wave-absorbing material.
The prepared composite wave-absorbing material is cut into samples of 300mm by 300mm, and the surface density, the high-frequency wave-absorbing performance, the salt water resistance and the like of the samples are tested.
By testing that the surface density of a sample is 0.8 Kg/square meter and the sample is soaked in a sodium chloride solution with the concentration of 5 percent by weight at the temperature of 65 ℃ for 96 hours, the composite material does not have the phenomena of stripping, falling off, powdering, cracking, foaming and the like. The test result of the high-frequency wave-absorbing performance is shown in figure 2.
Example 2
The preparation steps are as follows:
weighing 78 parts of aqueous polyurethane emulsion, 10 parts of chopped carbon fiber, 760W3 parts of Tego and 9 parts of deionized water.
Adding 1.2Kg of zirconium beads with the particle size of 2mm as grinding media into a laboratory high-speed dispersion machine, stirring at 800rpm for 0.5h to preliminarily wet each component, stirring at 2100rpm for 3h, testing the fineness of the slurry by a scraper blade fineness gauge to be less than or equal to 10um, and introducing cooling water into a dispersion tank during stirring to prevent the temperature of the slurry from being too high; sealing the dispersed materials, and standing for 12h at room temperature for later use.
The carbon steel plate with the size of 300 x 300mm is polished by 300-mesh abrasive paper and then cleaned, and a high-toughness epoxy resin coating with the thickness of 0.4mm is sprayed on the surface of the carbon steel plate by an air spray gun.
The ground wave-absorbing slurry is sprayed on the epoxy coating, the thickness of the coating is controlled to be 0.2mm, the coating can be sprayed for multiple times, and the sample is placed in an environment with the temperature not higher than 50 ℃ at intervals for surface drying.
Drying the sprayed sample at room temperature for 30-80min, and drying at 50 deg.C for 30min to obtain the required sample;
and testing the surface density, the high-frequency wave-absorbing performance, the salt water resistance and the like of the prepared sample.
By testing that the surface density of a sample is 0.43 Kg/square meter and the sample is soaked in a 5 percent by weight sodium chloride solution at the temperature of 65 ℃ for 96 hours, the composite material does not have the phenomena of stripping, falling off, powdering, cracking, foaming and the like. The test result of the high-frequency wave-absorbing performance is shown in figure 3.
Example 3
In the embodiment, the light and high-elasticity wave-absorbing material is prepared by taking a flexible fabric as a base material, and the basic process structure is shown in fig. 1, wherein the bottommost layer is a flexible metal coating 30, the middle layer is a flexible wave-absorbing coating 20, and the uppermost layer is a flexible fabric layer 10 (which can be camouflage fabric and the like).
The preparation steps are as follows:
70 parts of aqueous polyurethane dispersion, 20 parts of high-conductivity carbon black, 40005 parts of organic wetting dispersant and 5 parts of deionized water.
Adding 1.2Kg of zirconium beads with the particle size of 2mm as grinding media into a laboratory high-speed dispersion machine, stirring at 600rpm for 0.5h to preliminarily wet each component, stirring at 2400rpm for 3h, testing the fineness of the slurry by a scraper fineness meter to be less than or equal to 10um, and introducing cooling water into a dispersion tank during stirring to prevent the temperature of the slurry from being too high; sealing the dispersed materials, and standing for 12h at room temperature for later use.
Preparing a sizing agent for a metal coating: weighing 85 parts of water-based resin, 10 parts of sheet metal slurry and 5 parts of deionized water, and uniformly stirring and dispersing for later use.
Cutting the flexible fabric by 320mm x 320mm, fixing the fabric on a flat plate with the reverse side facing upwards, purging the fabric by using a spray gun, and spraying a layer of treatment liquid (ethanol);
and (2) spraying a proper amount of prepared wave-absorbing slurry on a fabric, controlling the thickness to be 0.5mm, spraying a flexible metal coating after the surface of the coating is dried, controlling the thickness to be 60-80um, and baking the coating at 50 ℃ for 0.5h to obtain the flexible composite wave-absorbing material.
The prepared composite wave-absorbing material is cut into samples of 300mm by 300mm, and the surface density, the high-frequency wave-absorbing performance, the salt water resistance and the like of the samples are tested.
By testing that the surface density of a sample is 0.65 Kg/square meter and the sample is soaked in a sodium chloride solution with the temperature of 65 ℃ and the weight of 5 percent for 96 hours, the composite material has no phenomena of stripping, falling, powdering, cracking, foaming and the like.
Example 4
In the embodiment, the light and high-elasticity wave-absorbing material is prepared by taking a flexible fabric as a base material, and the basic process structure is shown in fig. 1, wherein the bottommost layer is a flexible metal coating 30, the middle layer is a flexible wave-absorbing coating 20, and the uppermost layer is a flexible fabric layer 10 (which can be camouflage fabric and the like).
The preparation steps are as follows:
the water-based polyurethane emulsion is weighed to be 68 parts, the wave-absorbing filler is weighed to be 18 parts, the WS4000 is added to be 5 parts, and the deionized water is weighed to be 9 parts.
Adding 1.2Kg of zirconium beads with the particle size of 2mm as grinding media into a laboratory high-speed dispersion machine, stirring at 600rpm for 0.5h to preliminarily wet each component, stirring at 2200rpm for 3h, testing the fineness of the slurry by a scraper fineness meter to be less than or equal to 10um, and introducing cooling water into a dispersion tank during stirring to prevent the temperature of the slurry from being too high; sealing the dispersed materials, and standing for 12h at room temperature for later use.
Preparing slurry for the metal layer: weighing 75 parts of water-based resin, 20 parts of sheet metal slurry and 5 parts of deionized water, and uniformly stirring and dispersing for later use.
Cutting the flexible fabric by 320mm and 320mm, fixing the fabric on a plane plate with the reverse side facing upwards, purging the fabric by using a spray gun, and spraying a layer of treatment liquid;
and (2) spraying a proper amount of prepared wave-absorbing slurry on a fabric, controlling the thickness to be 0.6mm, spraying a flexible metal coating after the surface of the coating is dried, controlling the thickness to be 40-80um, and baking the coating at 50 ℃ for 0.5h to obtain the flexible composite wave-absorbing material.
The prepared composite wave-absorbing material is cut into samples of 300mm by 300mm, and the surface density, the high-frequency wave-absorbing performance, the salt water resistance and the like of the samples are tested.
By testing that the surface density of a sample is 0.75 Kg/square meter and the sample is soaked in a 5 percent by weight sodium chloride solution at the temperature of 65 ℃ for 96 hours, the composite material does not have the phenomena of stripping, falling off, powdering, cracking, foaming and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. The light high-elasticity wave-absorbing material is characterized by comprising a substrate layer and a flexible wave-absorbing layer which are sequentially arranged, wherein the flexible wave-absorbing layer comprises aqueous resin, wave-absorbing filler, organic wetting dispersant and deionized water.
2. The light-weight high-elasticity wave-absorbing material as claimed in claim 1, wherein the flexible wave-absorbing layer comprises 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave-absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water.
3. The light-weight high-elasticity wave-absorbing material as claimed in claim 1, wherein the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, a flexible metal coating is further disposed on the flexible wave-absorbing layer;
preferably, the flexible metal coating comprises an aqueous resin, a sheet metal paste and deionized water.
4. The light-weight high-elasticity wave-absorbing material as claimed in claim 3, wherein the flexible metal coating comprises 60-85 parts by weight of water-based resin, 10-20 parts by weight of sheet metal slurry and 5-10 parts by weight of deionized water;
preferably, the thickness of the flexible metal coating is 40-80 μm.
5. The light-weight high-elasticity wave-absorbing material according to claim 1 or 4, wherein the aqueous resin is one or more selected from the group consisting of aqueous polyurethane dispersion, aqueous polyurethane emulsion and aqueous epoxy resin.
6. The light weight high elasticity wave absorbing material of claim 1, wherein the wave absorbing filler is selected from one or more of the group consisting of highly conductive carbon black, highly conductive graphite, chopped carbon fiber, and chopped stainless steel fiber.
7. The light-weight high-elasticity wave-absorbing material as claimed in claim 1, wherein the organic wetting dispersant is one or more of dispersant WS4000, dispersant Tego 760W and dispersant BYK-190.
8. The light-weight high-elasticity wave-absorbing material as claimed in claim 1, wherein the thickness of the flexible wave-absorbing layer is 0.5-0.6 mm.
9. A method for preparing a light weight high elasticity wave absorbing material according to any one of claims 1 to 8, comprising the following steps:
s1, respectively weighing water-based resin, wave-absorbing filler, organic wetting dispersant and deionized water, and grinding and wetting by using a dispersion machine to prepare flexible wave-absorbing layer slurry;
and S2, spraying treatment liquid on the substrate layer, and then arranging a flexible wave absorbing layer on the substrate layer.
10. The method according to claim 9, wherein the substrate layer is a metal layer or a flexible fabric layer, and when the substrate layer is the flexible fabric layer, the method further comprises disposing a flexible metal coating on the flexible wave-absorbing layer;
preferably, the flexible metal coating is prepared by using a flexible metal coating slurry, and the preparation of the flexible metal coating slurry comprises the following steps: respectively weighing the water-based resin, the flaky metal slurry and the deionized water, stirring and dispersing to obtain the flexible metal coating slurry.
11. The preparation method according to claim 9, wherein the S1 specifically comprises:
respectively weighing 60-78 parts by weight of water-based resin, 10-20 parts by weight of wave-absorbing filler, 2-5 parts by weight of organic wetting dispersant and 10-16 parts by weight of deionized water;
adding zirconium beads with the particle size of 1.0-2.0 mm serving as a grinding medium into a high-speed dispersion machine, stirring at 500-800 rpm for 0.5h to preliminarily wet each component, stirring at 2000-2500 rpm for 3h, testing the fineness of slurry by using a scraper fineness meter to be less than or equal to 10 microns, and introducing cooling water into a dispersion tank during stirring; sealing the dispersed materials, and standing for 12h at room temperature for later use.
12. The method for preparing the flexible metal coating paste according to claim 10, wherein the preparing of the flexible metal coating paste specifically comprises: and respectively weighing 60-80 parts by weight of water-based resin, 15-20 parts by weight of flaky metal paste and 5-10 parts by weight of deionized water, stirring and dispersing to obtain the flexible metal coating paste.
13. The method according to claim 9, wherein the treatment liquid is one or more selected from the group consisting of ethanol, a silane coupling agent KH550/560, polyvinyl alcohol, and polyacrylamide.
14. The method according to claim 10, wherein when the substrate layer is a flexible fabric layer, the method specifically comprises:
spraying a treatment liquid on the flexible fabric layer;
and then spraying the flexible wave-absorbing layer slurry on the flexible fabric layer, controlling the thickness to be 0.5-0.6 mm, after the surface of the coating is dried, spraying a layer of flexible metal coating slurry, controlling the thickness to be 40-80 microns, and baking for 0.5-1 h at 45-50 ℃ to obtain the light high-elasticity wave-absorbing material.
15. Use of a lightweight highly elastic wave absorbing material according to any of claims 1 to 8 in stealth camouflage of radar stealths, stealth tarpaulins, stealth car covers, stealth tents.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811482149.2A CN111270529A (en) | 2018-12-05 | 2018-12-05 | Light high-elasticity wave-absorbing material and preparation method thereof |
| PCT/CN2019/111265 WO2020114090A1 (en) | 2018-12-05 | 2019-10-15 | Lightweight and highly elastic wave-absorbing material and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811482149.2A CN111270529A (en) | 2018-12-05 | 2018-12-05 | Light high-elasticity wave-absorbing material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111270529A true CN111270529A (en) | 2020-06-12 |
Family
ID=70974898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811482149.2A Pending CN111270529A (en) | 2018-12-05 | 2018-12-05 | Light high-elasticity wave-absorbing material and preparation method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111270529A (en) |
| WO (1) | WO2020114090A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111572109A (en) * | 2020-07-01 | 2020-08-25 | 宁波曙翔新材料股份有限公司 | Stealth material system and preparation method thereof |
| CN114411411A (en) * | 2021-12-24 | 2022-04-29 | 湖北华强科技股份有限公司 | Preparation method of sprayed electromagnetic wave-absorbing protective fabric |
| CN114798361A (en) * | 2022-05-11 | 2022-07-29 | 航天材料及工艺研究所 | Reusable flame-retardant ablation-resistant stealth compatible composite coating and preparation method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6346491B1 (en) * | 1999-05-28 | 2002-02-12 | Milliken & Company | Felt having conductivity gradient |
| CN102002294A (en) * | 2010-12-03 | 2011-04-06 | 北京工业大学 | Electromagnetic shielding waterborne paint and preparation method thereof |
| CN102154832A (en) * | 2010-12-31 | 2011-08-17 | 泉州红瑞兴纺织有限公司 | Fabric coating finishing agent with electromagnetic shielding function and preparation method thereof |
| CN103073961A (en) * | 2013-01-24 | 2013-05-01 | 南京洛普电子工程研究所 | Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method |
| CN103710991A (en) * | 2013-12-30 | 2014-04-09 | 东华大学 | Compatible radar and infrared stealthy fabric and preparation and application thereof |
| CN105113217A (en) * | 2015-09-09 | 2015-12-02 | 卜庆革 | Composite fiber capable of simultaneously absorbing low-frequency and high-frequency electromagnetic waves and preparation method thereof |
| CN105348967A (en) * | 2015-12-04 | 2016-02-24 | 中国中化股份有限公司 | Carbon-serial water-based highly-conductive coating and application thereof |
| CN106087388A (en) * | 2016-06-08 | 2016-11-09 | 山东天磁新材料科技有限公司 | A kind of flexible electromagnetic wave shielding absorbs cloth and preparation method thereof |
| US20180094112A1 (en) * | 2016-10-03 | 2018-04-05 | Eastman Kodak Company | Method and system for making light-blocking articles |
| CN108359368A (en) * | 2018-03-20 | 2018-08-03 | 四川大学 | Water-soluble electromagnetic screen coating and preparation method and water-soluble coating for EMI shielding preparation method |
| CN108699378A (en) * | 2018-04-25 | 2018-10-23 | 深圳鹏汇功能材料有限公司 | Aqueous wave absorbing coating and its preparation method and application |
| CN108727965A (en) * | 2018-05-17 | 2018-11-02 | 合肥科天水性科技有限责任公司 | A kind of preparation method of electromagnetic masking aqueous polyurethane leather |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100107509A1 (en) * | 2008-11-04 | 2010-05-06 | Guiselin Olivier L | Coated abrasive article for polishing or lapping applications and system and method for producing the same. |
| CN105778673B (en) * | 2014-12-22 | 2019-02-15 | 中国中化股份有限公司 | A kind of waterborne conductive coating and its preparation method and application |
| CN204939979U (en) * | 2015-09-09 | 2016-01-06 | 卜庆革 | Can simultaneously stability low frequency and frequency electromagnetic waves composite fibre and comprise fabric or the clothes of composite fibre |
| CN206212567U (en) * | 2016-08-29 | 2017-05-31 | 肖宇恒 | A kind of radiation-proof flexible sheet material for being applied to smart home |
| CN106453750B (en) * | 2016-10-12 | 2019-04-12 | 南京冠基电子有限公司 | A kind of radiation protection Anti-seismic Mobile phone film |
| CN106810284A (en) * | 2016-12-30 | 2017-06-09 | 闫博文 | A kind of preparation method of double-deck high temperature resistant heat insulation Wave suction composite material |
-
2018
- 2018-12-05 CN CN201811482149.2A patent/CN111270529A/en active Pending
-
2019
- 2019-10-15 WO PCT/CN2019/111265 patent/WO2020114090A1/en active Application Filing
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6346491B1 (en) * | 1999-05-28 | 2002-02-12 | Milliken & Company | Felt having conductivity gradient |
| CN102002294A (en) * | 2010-12-03 | 2011-04-06 | 北京工业大学 | Electromagnetic shielding waterborne paint and preparation method thereof |
| CN102154832A (en) * | 2010-12-31 | 2011-08-17 | 泉州红瑞兴纺织有限公司 | Fabric coating finishing agent with electromagnetic shielding function and preparation method thereof |
| CN103073961A (en) * | 2013-01-24 | 2013-05-01 | 南京洛普电子工程研究所 | Multi-element composite microwave absorbent, microwave absorbing coating, microwave absorbing base material and preparation method |
| CN103710991A (en) * | 2013-12-30 | 2014-04-09 | 东华大学 | Compatible radar and infrared stealthy fabric and preparation and application thereof |
| CN105113217A (en) * | 2015-09-09 | 2015-12-02 | 卜庆革 | Composite fiber capable of simultaneously absorbing low-frequency and high-frequency electromagnetic waves and preparation method thereof |
| CN105348967A (en) * | 2015-12-04 | 2016-02-24 | 中国中化股份有限公司 | Carbon-serial water-based highly-conductive coating and application thereof |
| CN106087388A (en) * | 2016-06-08 | 2016-11-09 | 山东天磁新材料科技有限公司 | A kind of flexible electromagnetic wave shielding absorbs cloth and preparation method thereof |
| US20180094112A1 (en) * | 2016-10-03 | 2018-04-05 | Eastman Kodak Company | Method and system for making light-blocking articles |
| CN108359368A (en) * | 2018-03-20 | 2018-08-03 | 四川大学 | Water-soluble electromagnetic screen coating and preparation method and water-soluble coating for EMI shielding preparation method |
| CN108699378A (en) * | 2018-04-25 | 2018-10-23 | 深圳鹏汇功能材料有限公司 | Aqueous wave absorbing coating and its preparation method and application |
| CN108727965A (en) * | 2018-05-17 | 2018-11-02 | 合肥科天水性科技有限责任公司 | A kind of preparation method of electromagnetic masking aqueous polyurethane leather |
Non-Patent Citations (2)
| Title |
|---|
| 孙酣经等: "《化工新材料产品及其应用手册》", 31 January 2002, 中国石化出版社 * |
| 宋慧君等: "《染整概论》", 31 January 2014, 东华大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111572109A (en) * | 2020-07-01 | 2020-08-25 | 宁波曙翔新材料股份有限公司 | Stealth material system and preparation method thereof |
| CN114411411A (en) * | 2021-12-24 | 2022-04-29 | 湖北华强科技股份有限公司 | Preparation method of sprayed electromagnetic wave-absorbing protective fabric |
| CN114798361A (en) * | 2022-05-11 | 2022-07-29 | 航天材料及工艺研究所 | Reusable flame-retardant ablation-resistant stealth compatible composite coating and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020114090A1 (en) | 2020-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111270529A (en) | Light high-elasticity wave-absorbing material and preparation method thereof | |
| CN108610725B (en) | Multi-band and multi-layer electromagnetic matching camouflage paint system and application thereof | |
| CN109423181B (en) | Infrared coating compatible with radar stealth and preparation method thereof | |
| CN104371271A (en) | New corrosion resistant composite wave absorbing material | |
| CN112549665A (en) | Radar-infrared-visible light multi-spectrum camouflage stealth structure and preparation method thereof | |
| CN112029376B (en) | High-performance radar composite wave-absorbing coating material and preparation method thereof | |
| CN110982421A (en) | High-temperature-resistant wave-absorbing coating and preparation method thereof | |
| CN114262567B (en) | Low-temperature-cured high-temperature-resistant wave-absorbing coating and preparation method thereof | |
| CN113438884B (en) | Water-based high-permeability wave-absorbing plate and preparation method thereof | |
| CN113135775B (en) | Stealth material for compatible inhibition of ultrahigh-temperature electromagnetic scattering and infrared radiation and preparation method thereof | |
| CN111690322A (en) | Infrared microwave stealth coating and preparation process thereof | |
| CN111234588A (en) | Wave-absorbing coating and preparation method thereof | |
| EP3055903B1 (en) | Electromagnetic field absorbing composition | |
| CN110845892A (en) | Fast-curing radar wave-absorbing putty and preparation method and application thereof | |
| CN110724405A (en) | Corrosion-resistant wave-absorbing putty and preparation method thereof | |
| CN109437824B (en) | Preparation method of 3D printing multifunctional MPC cement-based composite material | |
| CN115260932A (en) | Shielding adhesive tape with fingerprint prevention function | |
| CN215927659U (en) | Wave-absorbing coating structure for fan tower cylinder | |
| CN108822752A (en) | A kind of flexible patch and its preparation and application of absorbing material | |
| CN113072860A (en) | Nano rare earth oxide modified functional coating and preparation method thereof | |
| CN111286253A (en) | Epoxy rubber wave-absorbing coating and preparation method thereof | |
| CN114713840A (en) | Manufacturing method for manufacturing broadband electromagnetic shielding curved surface optical window based on composite micro-nano additive manufacturing | |
| CN113321963A (en) | Radar-proof stealth material for airplane and preparation method thereof | |
| CN114933864B (en) | Electromagnetic repair patch and preparation method thereof | |
| CN115678368B (en) | 2-14-micrometer-band high-absorption stray light-eliminating coating paint and preparation and application thereof |
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 |