CN110802781A - Invisible mine shell and preparation method thereof - Google Patents
Invisible mine shell and preparation method thereof Download PDFInfo
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- CN110802781A CN110802781A CN201910925611.XA CN201910925611A CN110802781A CN 110802781 A CN110802781 A CN 110802781A CN 201910925611 A CN201910925611 A CN 201910925611A CN 110802781 A CN110802781 A CN 110802781A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/22—Making multilayered or multicoloured articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B22/00—Marine mines, e.g. launched by surface vessels or submarines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92619—Diameter or circumference
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of combat weapons and discloses a stealth mine shell and a preparation method thereof, wherein the stealth mine shell comprises a hollow shell body formed by three functional layers, the three functional layers are a wave-transmitting layer, a wave-absorbing layer and a reflecting layer from outside to inside in sequence, the wave-transmitting layer is made of polyethylene powder with the total content of metal ions being less than or equal to 3000ppm, the wave-absorbing layer is made of a wave-absorbing foaming body material, the reflecting layer is made of low-melting-point metal alloy powder with the melting point of 110-170 ℃, and a one-time rotational molding forming method is adopted in the preparation method. According to the invention, the three functional layers are subjected to one-step rotational molding by utilizing the great difference of the particle sizes and the surface tensions of the polyethylene powder, the wave-absorbing foaming body material and the low-melting-point alloy powder, and the wave-absorbing effect of the stealth mine shell is greatly improved through the effective matching of the three functional layers, so that the stealth mine has the dual stealth functions of sonar stealth and electromagnetic wave stealth.
Description
Technical Field
The invention relates to the technical field of combat weapons, in particular to a invisible mine shell and a preparation method thereof.
Background
The mine is a weapon arranged in water, can destroy ships in a standby mode, limits the movement of the ships, and can also destroy bridges, hydraulic structures and the like, and the unique advantages of the mine weapon enable the mine weapon to play a prominent role in the past sea battles. Today, the important status of the mine warfare is not changed at all, and the good mine weapon can play a good role in the modern sea warfare.
The traditional mine is generally made of metal, but the mine works underwater for a long time, and the metal material is easy to corrode to cause failure, so that the problems of short service period, need of regular maintenance and the like are caused. With the improvement and development of the mine technology, the requirements on the mine concealment technology are higher and higher, and the mine made of metal materials cannot absorb electromagnetic waves, so that the mine concealment function is realized.
In order to realize the stealth function of the mine, the main modes comprise appearance stealth, self-burying stealth and material stealth, and the material stealth is the most effective mode for realizing the stealth function of the mine, so that the mine is widely concerned and researched. For example, the literature: mareforms, Tokuei, Wangyi, Tokuei stealth technology application research [ J ] ship electronic engineering, 2010,30(10): 173-; or the ferromagnetic metal thunder body is coated with a sound absorption material to reduce the reflectivity of the mine target; or the novel material with high sound transmission performance is adopted to manufacture the mine shell, so that most of incident sound waves of the sonar can penetrate through the mine, and the mine can achieve the sound transmission effect under the sonar.
However, the wave-absorbing material is used for manufacturing the mine shell, or the sound-absorbing coating is coated on the metal shell, so that the wave-absorbing effect is limited, and the requirement on the stealth function of the mine cannot be met, so that new materials and shell structures need to be continuously searched, the wave-absorbing effect of the mine shell is further improved, and the better stealth function is realized.
Disclosure of Invention
The invention provides a hidden mine shell and a preparation method thereof, aiming at overcoming the problems that in the prior art, a single wave-absorbing material is used for manufacturing a mine shell, or a sound-absorbing coating is coated on a metal shell, the wave-absorbing effect is limited, and the requirement on the hidden function of the mine cannot be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a stealthy mine shell comprises a hollow shell body formed by three functional layers, wherein the three functional layers are a wave-transmitting layer, a wave-absorbing layer and a reflecting layer from outside to inside in sequence, the wave-transmitting layer is made of polyethylene powder with the total content of metal ions being less than or equal to 3000ppm, the wave-absorbing layer is made of a wave-absorbing foaming body material, and the reflecting layer is made of low-melting-point metal alloy powder with the melting point of 110-170 ℃.
The applicant of the present invention finds, through a lot of researches, that a material with high wave transmittance can be prepared by controlling the metal ion content of the polyethylene material, so as to greatly reduce the reflection of external electromagnetic waves and guide the electromagnetic waves into the product. Therefore, the outermost functional layer in the invention adopts the wave-transmitting layer made of polyethylene powder with the metal ion content less than or equal to 3000ppm, so that electromagnetic waves can be effectively guided into the interior, and the reflection of the electromagnetic waves is reduced.
And then the wave absorbing layer made of the foam material with broadband wave absorption is arranged in the wave transmitting layer, the wave absorbing agent in the wave absorbing foam material can greatly absorb electromagnetic waves in a broadband range, and the foam material is provided with a plurality of micropores which contain air and can also consume a large amount of energy in the transmission process of the electromagnetic waves, so that the wave absorbing layer can effectively absorb the electromagnetic waves, and the torpedo has a stealth function.
However, even the wave-absorbing material with the best performance cannot completely consume electromagnetic waves and acoustic waves, so that the wave-absorbing material can reflect unabsorbed electromagnetic waves back to the absorbing layer for reabsorption by adhering a reflecting layer made of low-melting-point alloy to the inside of the wave-absorbing layer again, and further improves the wave-absorbing effect. Therefore, the mine shell can greatly improve the absorption effect on electromagnetic waves, effectively realizes the stealth function of the mine, and has excellent seawater corrosion resistance due to the fact that the outermost wave-transmitting layer takes polyethylene as a base material, so that the service life is ultra-long.
Preferably, the polyethylene powder has a particle size D95 of 0.6mm or less and a particle size D10 of 0.1mm or more. The polyethylene powder with the particle size can be effectively layered with the wave absorbing layer and the reflecting layer during rotational molding, and the prepared wave transmitting layer has good performance and high wave transmitting rate.
Preferably, the wave-absorbing foam material comprises, by mass, 38.65-92.45% of polyethylene resin, 5-50% of carbon nanotubes, 2-10% of an AC foaming agent, 0.2-1% of nano zinc oxide, 0.1% of an antioxidant 1010, 0.2% of an antioxidant 168 and 0.05% of peroxide DCP.
The wave-absorbing foam material is prepared by taking the polyethylene resin as a base material and the carbon nano tube as a wave-absorbing agent and adding the foaming agent, the antioxidant, the cross-linking agent, the peroxide DCP and other auxiliaries, wherein the wave-absorbing agent carbon nano tube has the advantages of wide frequency band, light weight and good compatibility, and the mechanical property and the thermal property of the carbon nano tube are good, so that the service life of the mine is prolonged.
Preferably, the particle size D95 of the wave-absorbing foaming material is less than or equal to 10mm, D5 is more than or equal to 0.5mm, and the sphericity is more than or equal to 80%. The wave-absorbing foam material with the shape and the size can ensure that the wave-absorbing foam material is layered with the wave-transmitting layer and the reflecting layer during rotational molding, and the wave-absorbing layer with the best wave-absorbing performance is manufactured.
Preferably, the low melting point metal alloy powder includes a binary or multicomponent alloy of bismuth, cadmium, tin, lead, dysprosium, indium, gallium, zinc, and antimony. The alloy with the components has a melting point meeting the requirements of rotational molding, and the prepared reflecting layer has excellent electromagnetic wave reflecting performance.
Preferably, the particle size D95 of the low melting point metal alloy powder is not more than 0.18 mm. The alloy powder with the grain diameter is beneficial to effectively realizing layering with the wave-transmitting layer and the wave-absorbing layer during rotational molding.
Preferably, the thickness of the wave-transmitting layer is 2-4mm, the thickness of the wave-absorbing layer is 2-8mm, and the thickness of the reflecting layer is 1-3 mm. The thickness of each functional layer in the invention can be matched with each other to achieve the best wave absorbing effect, thereby enabling the mine to be invisible better.
The invention also discloses a preparation method of the stealth mine, which comprises the following steps:
(1) extruding and granulating polyethylene containing metal ions by using a double-screw extruder, and crushing by using a plastic pulverizer to obtain polyethylene powder containing metal ions;
(2) mixing the raw materials of the wave-absorbing foam material according to a formula ratio, and extruding by using a water-cooling ground surface cutting extruder to obtain the wave-absorbing foam material;
(3) and uniformly mixing polyethylene powder, a wave-absorbing foaming body material and low-melting-point metal alloy powder, and then putting into a rotational molding die, and obtaining the stealth mine shell after rotational molding.
According to the invention, a great deal of research discovers that the three-layer obviously-layered torpedo shell can be prepared by one-time feeding during rotational molding by utilizing the great difference of the particle diameters and the surface tensions of the polyethylene powder, the wave-absorbing foaming body material and the low-melting-point alloy powder, the production process is simple, the production efficiency is high, and the shell processed by rotational molding is integrally closed, free of welding and excellent in wave-absorbing performance; rotational moulding is convenient for process into various bionical shapes with the naval mine appearance to deceive the sonar, realize the sonar stealthy, strengthened stealthy effect.
Preferably, the extrusion temperature in step (1) and step (2) is 130-. The polyethylene powder and the wave-absorbing foaming material can be smoothly extruded and molded at the temperature, and the particle size and the sphericity meet the requirements, so that the subsequent rotational molding is facilitated.
Preferably, the rotational molding process in the step (3) comprises the following steps: the furnace temperature is 240-300 ℃, the rotation speed is 10-20rpm, the speed ratio is 1:4, nitrogen is introduced for protection, when the temperature of the air in the mold reaches 180-220 ℃, the rotational molding mold is pulled out from the rotational molding machine, when the temperature of the air in the mold is less than 100 ℃, the processing is stopped, and the mold is opened to take out the product. By adopting the process, three functional layers can be effectively layered in the rotational molding process, the performance of each layer is good, and the prepared mine has a good stealth effect.
Therefore, the invention has the following beneficial effects:
(1) the wave-absorbing effect of the stealth mine shell is greatly improved through the effective matching of the three functional layers of the wave-transmitting layer, the wave-absorbing layer and the reflecting layer, so that the stealth mine has the dual stealth functions of sonar stealth and electromagnetic wave stealth, is light and corrosion resistant, and has long service time;
(2) the three functional layers can be formed by one-step rotational molding by utilizing the great difference of the particle sizes and the surface tensions of the polyethylene powder, the wave-absorbing foaming body material and the low-melting-point alloy powder, the preparation method is simple, complex equipment is not needed, and the industrial operation is easy to realize.
Detailed Description
The invention is further described with reference to specific embodiments.
Example 1:
a stealthy mine shell comprises a hollow shell body formed by three functional layers, wherein the three functional layers are a wave-transmitting layer with the thickness of 3mm, a wave-absorbing layer with the thickness of 6mm and a reflecting layer with the thickness of 1.5mm from outside to inside in sequence. The preparation method comprises the following steps:
(1) preparing a rotational molding die, wherein the shape is spherical, and the diameter is 0.6 m;
(2) extruding polyethylene with the total metal ion content of 900ppm by using a double-screw extruder for granulation, wherein the extrusion temperature is 150 ℃, and distilled water is used for cooling in the extrusion process; then crushing the mixture by a plastic pulverizer to obtain a powder with the particle size D95 being 0.45mm and D10 being 0.15 mm;
(3) mixing 66.95kg of polyethylene resin, 25kg of carbon nano tube, 7kg of AC foaming agent, 0.7kg of nano zinc oxide, 0.1kg of antioxidant 1010, 0.2kg of antioxidant 168 and 0.05kg of peroxide DCP, extruding by using a water-cooled grinding surface cutting extruder to obtain a wave-absorbing foam material, wherein the diameter of a die hole of the extruder is 2.8mm, the extrusion temperature is 150 ℃, and the particle diameter D95 of the prepared foam material is 3.2mm, D5 of the prepared foam material is 2.2mm and the sphericity of the foam material is 97%;
(4) mixing 3.2kg polyethylene powder, 1.5kg wave-absorbing foam material, and 13.8kg bismuth-tin alloy with melting point of 138 deg.C and particle diameter D95 of 0.1mm in a medium-speed mixer for 5 min;
(5) and putting the mixed raw materials into a rotational molding die, pushing the rotational molding die into a rotational molding machine for production, introducing nitrogen for protection at the furnace temperature of 270 ℃, the rotation speed of 12rpm and the speed ratio of 1:4, pulling the die out of the rotational molding machine when the temperature of air in the die reaches 210 ℃, stopping processing when the temperature of the air in the die reaches 90 ℃, opening the die and taking out the product.
Example 2:
a stealthy mine casing comprises a hollow casing body formed by three functional layers, wherein the three functional layers are a wave-transmitting layer with the thickness of 2mm, a wave-absorbing layer with the thickness of 2mm and a reflecting layer with the thickness of 1mm from outside to inside in sequence. The preparation method comprises the following steps:
(1) preparing a rotational molding die, wherein the shape is spherical, and the diameter is 0.6 m;
(2) extruding polyethylene with the total metal ion content of 900ppm by using a double-screw extruder for granulation, wherein the extrusion temperature is 130 ℃, and distilled water is used for cooling in the extrusion process; then crushing the mixture by a plastic pulverizer to obtain a powder with the particle size D95 being 0.45mm and D10 being 0.15 mm;
(3) mixing 38.65kg of polyethylene resin, 50kg of carbon nano tube, 10kg of AC foaming agent, 1kg of nano zinc oxide, 0.1kg of antioxidant 1010, 0.2kg of antioxidant 168 and 0.05kg of peroxide DCP, and extruding by using a water-cooled grinding surface cutting extruder to obtain a wave-absorbing foam material, wherein the diameter of a die hole of the extruder is 2.8mm, the extrusion temperature is 130 ℃, and the particle diameter D95 of the prepared wave-absorbing foam material is 3.2mm, the particle diameter D5 of the prepared wave-absorbing foam material is 2.2mm, and the sphericity of the prepared wave-absorbing foam material is 97%;
(4) mixing 2.1kg polyethylene powder, 0.5kg wave-absorbing foam material, and 9.2kg gallium bismuth alloy with melting point of 120 deg.C and particle diameter D95 of 0.1mm in a medium speed mixer for 5 min;
(5) and putting the mixed raw materials into a rotational molding die, pushing the rotational molding die into a rotational molding machine for production, introducing nitrogen for protection when the furnace temperature is 240 ℃, the rotation speed is 10rpm, the speed ratio is 1:4, pulling the die out of the rotational molding machine when the air temperature in the die reaches 180 ℃, stopping processing when the air temperature in the die reaches 90 ℃, opening the die and taking out the product.
Example 3:
a stealthy mine shell comprises a hollow shell body formed by three functional layers, wherein the three functional layers are a wave-transmitting layer with the thickness of 4mm, a wave-absorbing layer with the thickness of 8mm and a reflecting layer with the thickness of 3mm from outside to inside in sequence. The preparation method comprises the following steps:
(1) preparing a rotational molding die, wherein the shape is spherical, and the diameter is 0.6 m;
(2) extruding polyethylene with the total metal ion content of 900ppm by using a double-screw extruder for granulation, wherein the extrusion temperature is 180 ℃, and distilled water is used for cooling in the extrusion process; then crushing the mixture by a plastic pulverizer to obtain a powder with the particle size D95 being 0.45mm and D10 being 0.15 mm;
(3) mixing 92.45kg of polyethylene resin, 5kg of carbon nano tubes, 2kg of AC foaming agent, 0.2kg of nano zinc oxide, 0.1kg of antioxidant 1010, 0.2kg of antioxidant 168 and 0.05kg of peroxide DCP, and extruding by using a water-cooled surface cutting extruder to obtain a wave-absorbing foam material, wherein the diameter of a die hole of the extruder is 2.8mm, the extrusion temperature is 180 ℃, and the particle diameter D95 of the prepared wave-absorbing foam material is 3.2mm, the particle diameter D5 of the prepared wave-absorbing foam material is 2.2mm, and the sphericity of the prepared wave-absorbing foam material is 97%;
(4) mixing 4.2kg polyethylene powder, 2kg wave-absorbing foam material, 27.6kg bismuth-tin alloy with melting point of 138 deg.C and particle diameter D95 of 0.1mm in a medium speed mixer for 5 min;
(5) and putting the mixed raw materials into a rotational molding die, pushing the rotational molding die into a rotational molding machine for production, introducing nitrogen for protection at the furnace temperature of 300 ℃, the rotation speed of 20rpm and the speed ratio of 1:4, pulling the die out of the rotational molding machine when the temperature of air in the die reaches 220 ℃, stopping processing when the temperature of air in the die reaches 90 ℃, opening the die and taking out the product.
Comparative example 1:
comparative example 1 is different from example 1 in that polyethylene having a total metal ion content of 5000ppm is used for extrusion granulation in step (2) to obtain polyethylene powder, and the rest is the same as in example 1.
Comparative example 2:
comparative example 2 differs from example 1 in that the polyethylene powder of comparative example 2 has a particle size D95 of 0.45mm and D10 of 0.15 mm; the particle diameter D95 of the wave-absorbing foaming material is 0.64mm, and the particle diameter D5 is 0.44 mm; the particle size D95 of the bismuth-tin alloy powder was 0.4mm, and the procedure was repeated as in example 1.
The stealth mine shells prepared in the above examples and comparative examples are subjected to wave-absorbing performance tests according to the method of GB/T37766-2019, and the results are shown in Table 1.
Table 1: and (5) testing the wave absorbing performance.
| Numbering | -10dB bandwidth |
| Example 1 | 114％ |
| Example 2 | 116％ |
| Example 3 | 113％ |
| Comparative example 1 | 97％ |
| Comparative example 2 | 65％ |
As can be seen from table 1, the mine shells prepared by the method and the materials of the invention in examples 1 to 3 have wide frequency band and good wave absorbing performance, and three functional layers can be effectively layered after one-time rotational molding. In contrast, when the metal ions in the wave-transmitting layer in the comparative example 1 exceed 3000ppm, the wave-absorbing performance of the shell is obviously reduced, probably because the wave-transmitting effect of the wave-transmitting layer is affected after the metal ions exceed a certain content range. Comparative example 2 after changing the particle size of polyethylene powder, absorbing foam material and low melting point alloy powder, three functional layers can not effectively be layered after one-time rotational molding, therefore three functional layers can not synergistic effect, absorbing effect greatly reduced.
Claims (10)
1. A stealthy mine shell is characterized by comprising a hollow shell body formed by three functional layers, wherein the three functional layers are a wave-transmitting layer, a wave-absorbing layer and a reflecting layer from outside to inside in sequence, the wave-transmitting layer is made of polyethylene powder with the total content of metal ions being less than or equal to 3000ppm, the wave-absorbing layer is made of a wave-absorbing foaming body material, and the reflecting layer is made of low-melting-point metal alloy powder with the melting point of 110-170 ℃.
2. The concealed mine shell according to claim 1, wherein the polyethylene powder has a particle size D95 of 0.6mm or less and a particle size D10 of 0.1mm or more.
3. The concealed mine shell according to claim 1, wherein the wave-absorbing foam material comprises, by mass, 38.65% -92.45% of polyethylene resin, 5% -50% of carbon nanotubes, 2% -10% of an AC foaming agent, 0.2% -1% of nano zinc oxide, 0.1% of an antioxidant 1010, 0.2% of an antioxidant 168, and 0.05% of peroxide DCP.
4. The concealed mine shell according to claim 1, 2 or 3, wherein the wave-absorbing foam material has a particle size D95 of 10mm or less, a particle size D5 of 0.5mm or more, and a sphericity of 80% or more.
5. The concealed mine shell according to claim 1, wherein the low melting point metal alloy powder comprises a binary or multi-element alloy of bismuth, cadmium, tin, lead, dysprosium, indium, gallium, zinc, antimony.
6. The concealed mine shell according to claim 1, 2 or 5, wherein the particle size D95 of the low melting point metal alloy powder is not more than 0.18 mm.
7. The concealed mine shell according to claim 1, wherein the thickness of the wave-transmitting layer is 2-4mm, the thickness of the wave-absorbing layer is 2-8mm, and the thickness of the reflecting layer is 1-3 mm.
8. A method of making a concealed mine shell according to any of claims 1 to 6, characterised in that it comprises the steps of:
(1) extruding and granulating polyethylene containing metal ions by using a double-screw extruder, and crushing by using a plastic pulverizer to obtain polyethylene powder containing metal ions;
(2) mixing the raw materials of the wave-absorbing foam material according to a formula ratio, and extruding by using a water-cooling ground surface cutting extruder to obtain the wave-absorbing foam material;
(3) and uniformly mixing polyethylene powder containing metal ions, a wave-absorbing foaming body material and low-melting-point metal alloy powder, and then putting into a rotational molding die, and performing rotational molding to obtain the stealth mine shell.
9. The method for preparing the concealed mine shell according to claim 8, wherein the extrusion temperature in the steps (1) and (2) is 130-180 ℃.
10. The method for preparing the concealed mine shell according to claim 8, wherein the rotational molding process in the step (3) comprises the following steps: the furnace temperature is 240-300 ℃, the rotation speed is 10-20rpm, the speed ratio is 1:4, nitrogen is introduced for protection, when the temperature of the air in the mold reaches 180-220 ℃, the rotational molding mold is pulled out from the rotational molding machine, when the temperature of the air in the mold is less than 100 ℃, the processing is stopped, and the mold is opened to take out the product.
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| CN115230269A (en) * | 2022-07-21 | 2022-10-25 | 江苏中科聚合新材料产业技术研究院有限公司 | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof |
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| CN115230269A (en) * | 2022-07-21 | 2022-10-25 | 江苏中科聚合新材料产业技术研究院有限公司 | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof |
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Denomination of invention: A Stealth Mine Shell and Its Preparation Method Effective date of registration: 20221129 Granted publication date: 20210528 Pledgee: China Construction Bank Corporation Cixi sub branch Pledgor: ZHEJIANG ROTOUN PLASTIC TECHNOLOGY Co.,Ltd. Registration number: Y2022330003313 |
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Address after: 315323 588 Industrial Avenue, Shengshan Town, Cixi City, Ningbo City, Zhejiang Province Patentee after: ZHEJIANG ROTOUN PLASTIC TECHNOLOGY Co.,Ltd. Address before: 315323 588 Industrial Avenue, Shengshan Town, Cixi City, Ningbo City, Zhejiang Province Patentee before: ZHEJIANG ROTOUN PLASTIC TECHNOLOGY Co.,Ltd. |