KR100403795B1 - A shot for light fire arms - Google Patents

Abstract

The present invention relates to a fire extinguisher bullet which is nontoxic, has high accuracy of hitting, and has good power, destructive and emergency characteristics, suitable for the purpose of use, without improving gun barrels, propellants, primers, and the like.

The present invention provides a thermoplastic resin composition (3) in which a plasticizer is added to a thermoplastic polymer resin, a heavy metal (4) having a large powder particle diameter and a heavy metal (5) having a small powder particle diameter for adjusting the specific gravity of a bullet. A carbonaceous material is formed from a biodegradable additive for natural decomposition of the polymer resin and a binder for improving the interfacial adhesion between the thermoplastic resin composition (3) and the heavy metal (4.5), and the carbonaceous material is converted into a bullet having a specific shape. After forming, the surface is subjected to surface treatment of metal plating, resin coating or molybdenum sulfide coating.

Description

Bullet for fire extinguisher {A SHOT FOR LIGHT FIRE ARMS}

The present invention relates to bullets for fire extinguishers such as pistols, rifles, machine guns, shotguns, and the like, and more particularly, to non-toxic firearm bullets that are not made of lead.

Bullet performance is mainly evaluated by accuracy of hit and power characteristics. Until recently, bullets with high accuracy and power have been required. However, recently, bullets are not toxic or harmful to the environment or animals. Power characteristics, destruction characteristics, emergency characteristics (the characteristics of flying bullets) have also been required. Among them, the power characteristics may require strong power depending on the purpose, and particularly, the purpose of the weak power is to prevent damage to the aircraft or the aircraft such as a building plane during terrorism, riots or suppression of hijacks. Or do not apply more damage to the target than is necessary.

In addition, the destruction characteristics of the bullet itself may be required in some cases where difficult fracture resistance is difficult to destroy and easy fracture resistance is easy to destroy. Among them, the purpose of easy destructiveness is to prevent damage to various objects or to be destroyed when hitting a target during terrorism, rioting or hijacking. In addition, the emergency characteristics of the fired bullet may be a case where high emergencyness is required depending on the purpose, and a case where low emergencyness or non-emergency without emergency is required. The purpose of low emergency or non-commercial purpose is to prevent secondary damage caused by non-emergency bullets in the event of terrorism, riots or suppression of hijackings. .

Conventional bullets, except for special shells such as iron armor or mineral bullets, lead is used for the bullet core 1 of the ordinary bullet shown in FIG. 1, and the shells are covered with a bullet shell 2 of a cylindrical metal such as copper or copper alloy. It consists. Shotgun shells are made of lead only, without warheads, and lead is highly toxic and causes adverse effects on the environment and animals, such as deterioration of water quality and lead poisoning when animals eat or drink. have. As an improvement of this drawback, the invention disclosed in Unexamined-Japanese-Patent No. 7-503528 is known, for example.

The invention of Japanese Patent Application Laid-open No. Hei 7-503528 is a compression mixture of thermoplastic resins selected from the group consisting of fine copper powder, nylon 11 and nylon 12 d. The copper powder is at least 92% by mass and the minimum specific gravity of the compressed mixture is 5.7.

Among the bullets described in the prior art, bullets using lead in the bullet core 1 have a high toxicity as described above, and have a problem of adversely affecting the environment and animals, while having an appropriate specific gravity and high accuracy. There is a characteristic. Since the accuracy of this bullet is covered with warhead shells (2) such as copper and copper alloys, especially in the case of ordinary bullets, the bullet is rotated by the spiral when firing through the barrel with the spiral formation. Can be obtained.

However, the power characteristics of ordinary bullets are excellent in the fact that they have a strong power because the specific gravity of lead (tan core (1)) is 11.3, but they appear as defects when low power is required. In addition, since the core (1) is a single composition only of lead, there is a problem that can not be adjusted to the power characteristics of the specific gravity suitable for the purpose. In addition, the destruction characteristics of the bullet itself are excellent in terms of non-destructive properties that cannot be destroyed, but have a problem in that when easy fracture properties are required, they become disadvantages. In addition, the emergency characteristics of the bullets fired are high in emergency as bullets covered by the warhead shell (2), and low in emergency with bullets containing only lead without shells, but the specific characteristics of rotation are difficult to obtain. Degrades.

Next, according to the invention of Japanese Patent Laid-Open No. 7-503528, since the thermoplastic resin is composed of nylon 11 and nylon 12, it is excellent in corrosion resistance and hardly decomposes in environmental problems. In recent years, it is itself a cause for pollution. As apparent from the fact that recycling and source reduction (reduction of source) are important, there is a problem of destroying the environment and wasting resources.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to improve the accuracy of the gun, non-toxic, high accuracy, and non-toxic power characteristics, emergency The present invention provides a fire extinguisher bullet having characteristics and destruction characteristics.

In order to solve the above object, the fire extinguisher bullet of the invention according to claim 1 is a thermoplastic resin composition in which a plasticizer is added to a thermoplastic polymer resin, a heavy metal in the form of powder particles for adjusting the specific gravity of the bullet, the thermoplastic resin composition and the heavy metal. A bullet material was formed from a binder for improving interfacial adhesion with the carbide, and the bullet material was formed into a specific shape of bullet.

According to the invention of claim 1, since the thermoplastic resin composition is obtained by adding a plasticizer to the thermoplastic polymer resin, fluidity is improved in the molding processing temperature range. As a result, the thermoplastic resin composition can be seamlessly introduced around the surface of the heavy metal in the form of powder particles. In addition, since the corrosion resistance is excellent, deformation of the shape does not occur during the storage of the bullet, and at the same time, it decomposes more easily in the environment than in the nylon 11, nylon 12, or the like.

In addition, since heavy metals in the form of powder particles are mixed, the power characteristics can be adjusted by increasing the specific gravity of the bullet to increase the specific gravity, or by lowering the specific gravity to lower the specific gravity. In addition, by forming heavy metals into powder particles, it is possible to disperse a specific shape of bullets from a bullet material without uniform segregation even in finely shaped portions or corners of the bullets, and to form injection moldings. Machining can be made easy.

In addition, since a binder is added in the mixing of the thermoplastic resin composition and the heavy metal, the surface of the heavy metal is coated to increase the affinity with the thermoplastic resin composition, and the interface adhesion between the molecules of the thermoplastic resin composition and the particle surface of the heavy metal. Sex is improved. Therefore, even if the thermoplastic resin composition is elastically deformed, peeling off of the thermoplastic resin composition from the surface of the heavy metal can be suppressed.

The thermoplastic resin composition of the present invention according to claim 2 is a biodegradable additive for naturally decomposing the polymer resin.

According to the invention according to claim 2, since the biodegradable additives that naturally decompose the polymer resin are added to the thermoplastic resin composition, the biodegradable additives are melted and cooled to interconnect the heavy metals in the form of powder particles. The heavy metal in the form of powder granules can be tightly packed into the inside of the chamber. To this end, even a heavy metal having a high melting point is capable of injection molding through biodegradable additives, so that the bullet can be easily processed. In addition, the biodegradable additives do not decompose the polymer resin during daily use, and when the polymer resin is left in the soil or water, it is decomposed by microorganisms to form a low molecular compound. Finally, it can be considered as carbon dioxide gas or water, and it is a non-toxic substance that does not adversely affect the environment or animals.

In the thermoplastic resin composition of the invention according to claim 3, an elastomer for increasing the elasticity of the bullet is added.

According to the invention according to claim 3, since an elastomer showing rubber elasticity at room temperature is added to the thermoplastic resin composition, the elasticity of the bullet is increased, and the mixing ratio is added or subtracted to give a bullet having emergency characteristics suitable for the purpose. I can adjust it. That is, the mixing ratio of the elastomer can be increased to reduce the low non-carbohydrate or the mixing ratio of the elastomer, and the fracture characteristics suitable for the purpose can be adjusted according to the mixing ratio of other components.

The heavy metal of the invention according to claim 4 is capable of mixing a heavy metal having a powder particle diameter of 1 to 3 µm and a heavy metal having a powder particle diameter of 30 to 150 µm.

According to the invention according to claim 4, the heavy metal is mixed with a heavy metal having a small powder particle diameter and a heavy metal having a large powder particle diameter, so that the kneading resistance is increased, the heavy metal forms bridging, and the screw of the molding machine is easily damaged. To prevent peeling with the thermoplastic resin composition, and the like. That is, in the case of only heavy metals having small powder particle diameters, the total area of the heavy metals increases to increase the frictional resistance and the kneading resistance. In the case of only heavy metal having a large powder particle diameter, internal bridging such as a molding machine is easily formed during kneading, so that the screw is easily broken, and the total area of the heavy metal is narrowed, so that peeling with the thermoplastic resin composition is likely to occur. As in the present invention, by mixing a heavy metal having a small powder particle diameter and a heavy metal having a large powder particle diameter, both defects can be fixed.

In addition, the material of the heavy metal of the invention according to claim 5 is to enable any one or combination of tungsten, stainless steel, iron, copper or aluminum.

According to the invention of claim 5, the material of the heavy metal is any one of tungsten, stainless steel, iron, copper or aluminum, or a combination thereof, so that the specific gravity of the bullet can be selected from low to high. In other words, by adding or subtracting each mixing ratio, the ratio of the bullet is increased to a high power. Alternatively, by lowering the specific gravity to lower power, the power characteristics suitable for the purpose can be adjusted.

Moreover, the surface of the bullet after forming in the said specific shape of invention of Claim 6 was surface-treated by either metal plating, resin coating, or molybdenum sulfide coating.

According to the invention according to claim 6, since the surface of the bullet is surface-treated by metal plating, resin coating, molybdenum disulfide coating or the like, the bullet rotates along the spiral when firing through the barrel in which the spiral is formed. It is possible to obtain the accuracy of accuracy equivalent to at least the conventional ordinary bullet by improving the rotational properties.

In addition, the bullet material of the invention according to claim 7 is made of glass of powder particle shape instead of heavy metal of powder particle shape.

According to the invention according to claim 7, the bullet material is a mixture of a thermoplastic resin composition and powdered glass, so that a low-power low-density bullet can be easily formed.

Moreover, the said heavy metal is mixed in the said glass of this invention of Claim 8.

According to the invention according to claim 8, since the bullet material is a mixture of a thermoplastic resin composition and a powdered heavy metal and glass, it is possible to adjust the specific gravity of the bullets extensively and to increase the specific gravity to a high force or to increase the specific gravity. When making it low and making low power, the power characteristic can be finely adjusted by adding or subtracting the mixing ratio of the heavy metal with high specific gravity and low specific gravity.

Moreover, the specific gravity of the bullet after forming in the said specific shape of invention of Claim 9 is set to 2-13.5.

According to the invention according to claim 9, the specific gravity of the bullet after being formed into a specific shape is set to 2 to 13.5. Therefore, the low specific gravity bullet, the high specific gravity bullet, or the intermediate gravity characteristic bullet are selected. It can be formed selectively according to the purpose of use.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view of a bullet consisting of a lead core and a warhead shell according to the prior art, the partial sectional view of

Figure 2 is an explanatory view of a bullet-free bullet shot composed of a thermoplastic resin composition and a heavy metal according to the present invention, its partial cross-sectional view,

3 is an explanatory diagram showing a method of obtaining accuracy of hits;

<Description of Symbols for Main Parts of Drawings>

1. bullet core 2. bullet shell

3. Thermoplastic composition 4. Heavy metal with large powder particle diameter

5. Heavy metal with small powder particle diameter

Embodiments of the present invention will be described below with reference to the drawings and the tables.

FIG. 2 is a partial cross-sectional view illustrating a bullet having no warhead shell composed of a thermoplastic resin composition and a heavy metal according to the present invention. As shown in Fig. 2, a bullet material is formed from a thermoplastic resin composition 3, heavy metals 4 and 5 having a large and small powder particle diameter, a binder, and additives for each purpose described below. Then, the bullet material is formed into a bullet having a specific shape, and the surface treatment described later is carried out, and then mounted in a gunpowder not shown. Therefore, it is possible to form only the thermoplastic resin composition 3 mixed with heavy metals 4 and 5 with a small particle diameter of z without having to coat the warhead shell 2 like the conventional ordinary bullet shown in FIG. .

The thermoplastic resin composition 3 of the bullet material is obtained by adding a plasticizer to the thermoplastic polymer resin, and the thermoplastic polymer resin is a polypropylene (PP), polyethylene (PE), polyurethane (PU), polystyrene (PS), or the like. One may be. Moreover, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or polyester resin may be sufficient.

In addition, you may use ionomer resin used for coating the golf ball surface etc. instead of polyethylene. Nylon 6 (6PA) is also available.

As a plasticizer, the molding property is facilitated by improving the flow characteristic in the forming temperature range of the polymer resin. Specifically, it contains, for example, a plasticizer of phthalic acid esters such as dioctyl phthalate (DOP) and dibutyl phthalate (DBP), and an internal lubricant such as ethylene bis stearamide. This plasticizer improves the flow characteristics at the time of forming and processing a bullet material into a bullet of a particular shape to facilitate molding processing.

In addition, polyester plasticizers, plasticizers of phosphate esters such as tricredyl phosphate (TCP) and triphenyl phosphate (TPP), and fatty acid esters such as epoxidized soybean oil and methylacetyl ricinolate (MAR) are also included. will be. The compounding quantity makes dioctyl phthalate (DOP) into 13 mass% or less with respect to the gross mass of the thermoplastic resin composition 3, for example.

Next, a biodegradable additive to be added to the thermoplastic resin composition 3 of the bullet material will be described. This biodegradable additive is an additive for natural decomposition of the polymer resin, specifically, a biodegradable additive made of microorganisms such as poly-3-hydroxy butylate, bio polyester, cadmane, furan, bacterial cellulose and polyamino acid. Or chemical synthesis of biodegradable additives made from natural products such as starch, chitin, chitosan, sea polysaccharides, cellulose, and aliphatic polyesters, polyurethane resins, polyamide-based resins, polyvinyl alcohols, and polyethers. Biodegradable additives made of the resin are preferred.

In this example, polypropylene (PP) and starch-based biodegradable and water-soluble biodegradable additives were mixed in a ratio of 80 to 20 by mass ratio. Then, these biodegradable additives are mixed with the polymer resin, so that the polymer resin is not decomposed during daily use, and when the bullet is left in the ground or in water, the mixed thermoplastic resin composition (3) itself by water or the like is finally produced by water, Carbon dioxide, biomass (microorganisms) can be decomposed into.

Next, the heavy metal / glass of powder particle shape for adjusting the specific gravity of a bullet is demonstrated. This heavy metal / glass is a specific gravity adjusting material mixed with a bullet material in order to produce a bullet having low specific gravity or high gravity specific gravity. In the present invention, the heavy metal includes tungsten (W: 19.3), stainless steel (SUS: 7.7), iron (Fe: 7.87), copper (Cu: 8.96), and especially aluminum (Al: 2.69). . In addition, any one or selective combination of heavy metals including these alloys is mixed with the bullet material. As for glass (GP: specific gravity 2.5), it is only glass or mixed with the heavy metal and mixed with the bullet material.

Among these specific gravity modifiers (heavy metal / glass), the most suitable heavy metal is tungsten as a tungsten material, which does not adversely affect the surrounding environment. Since it has a specific gravity of 19.3, it is most suitable for creating a high specific gravity region within a limited volume of the bullet. In the case of composition in the low specific gravity region, glass is most suitable, and aluminum is also preferable. And by combining each of the above materials or these, it is possible to selectively form a bullet material suitable for the purpose of use from a low specific gravity region to a high specific gravity region.

Next, the specific gravity adjustment using the above-mentioned bullet material is demonstrated. The polymer resin of the thermoplastic resin composition (3) is made of polypropylene (PP) or nylon 6 (PA), and mixed with these powders, heavy metal powder particles of glass (GP), elastomers, etc. Table 1 shows an example of distribution at the time of adjusting and adjusting the production of bullet materials having different specific gravity. In addition, the elastic polymer can increase the elasticity of the bullet, either natural rubber or synthetic rubber or a combination thereof. In the example of the present invention, synthetic rubber was added.

Basic composition table (mass%) of various specific gravity bullets importance PP 6PA GP AL SUS Cu W Elastomer Sum shot 2 11.5 85.0 3.5 100 2 25.6 74.4 100 4 13.5 86.5 100 4 7.7 10.9 79.1 2.3 100 4 12.9 13.7 73.4 100 8 7.3 92.7 100 8 3.6 7.6 87.7 1.1 100 11.3 3.5 96.5 100 11.3 3.1 96.0 0.9 100 13.5 1.7 97.8 0.5 100

As shown in Table 1, the specific gravity of the bullet is 2/4/8 / 11.3 / 13.5 and can be arbitrarily adjusted. If the ratio of the bullet is less than 2, the ballistic is not stable because the bullet is too light and the initial velocity of the bullet is excessively fastened when the ball is fired through the barrel that forms the spiral, so that rotation along the spiral cannot be obtained. This is bad and you can't get a certain hit. On the contrary, if the specific gravity of the bullet is 13.5 or more, there is a limit on the amount of the medicine in the barrel, and as a result, the initial speed decreases, and as a result, a specific high force cannot be obtained.

In addition, the heavy metal has two kinds of the heavy metal (4) having a large powder particle diameter and the heavy metal (5) having a small powder particle diameter so as to lower the kneading resistance with the thermoplastic resin composition (3) and to prevent the screw of the molding machine or the like from being damaged. Is mixed. The heavy metal (5) having a small powder particle diameter has a powder particle diameter in the range of 1 to 3 µm and a heavy metal (4) having a large powder particle diameter in the range of 30 to 70 mass% with respect to the total mass of the heavy metal. Silver powder whose particle diameter is 30-150 micrometers exists in the range of 30-70 mass% with respect to the gross mass of heavy metal. In addition, the heavy metal 4 having a large powder particle diameter is more preferably in the range of 100 to 150 µm in order to suppress kneading resistance. Moreover, in order to suppress the flow mark of a molded article, the addition mass of the heavy metal 4 with large powder particle diameter is more preferable in the range of 55-70 mass%.

Next, the reason for numerical limitation of the powder particle diameter of the heavy metal 5 with small powder particle diameter is demonstrated. If the powder particle diameter of the heavy metal (5) having a small powder particle diameter among the heavy metals is smaller than 1 mu m, the surface area of the heavy metal (5) having a small powder particle diameter increases during molding, thereby increasing the frictional resistance and increasing the kneading resistance. . In addition, because of the fine powder shape having a small powder particle diameter, it is easily dusted and scattered during operation, and the working environment is deteriorated and the manufacturing cost is increased. If the powder particle diameter of the heavy metal 5 having a small powder particle diameter in the heavy metal is larger than 3 µm, it is easy to form a bridge inside the extruder, and the screw is likely to be broken. Therefore, as for the powder particle diameter of the heavy metal 5 with small powder particle diameter, 1-3 micrometers is preferable.

If the heavy metal (5) having a small powder particle diameter is less than 30 mass% with respect to the total mass of the heavy metal, the effect of adding the heavy metal (5) having a small powder particle diameter is less, and the ratio of the heavy metal (4) having a large powder particle diameter is relatively small. This increase further makes it easier to form a ridge inside the molding machine, and the screw of the extruder is likely to break. In addition, the total surface area of the heavy metal is reduced, and peeling occurs between the heavy metal and the thermoplastic resin composition, so that cracks or lack of strength of the molded article (carbon) are likely to occur. When the heavy metal 5 having a small powder particle diameter exceeds 70 mass% with respect to the total mass of the heavy metal, the total surface area of the heavy metal is too large to increase the frictional resistance, resulting in high kneading resistance at the time of molding. Therefore, the heavy metal 5 with small powder particle diameter shall be 30-70 mass% with respect to the gross mass of heavy metal.

Next, the reason for numerical limitation of the particle size distribution of the heavy metal 4 with large powder particle diameter is demonstrated. If the powder particle diameter of the heavy metal 4 having a large powder particle diameter is smaller than 30 µm, the effect of adding the heavy metal 4 having a large powder particle diameter is less, and the kneading resistance is increased during extrusion. If the powder particle diameter of the heavy metal (4) having a large powder particle diameter in the heavy metal is larger than 150 µm, a bridge is formed inside the extruder at the time of extrusion, and the screw inside the extruder is easily broken, and the heavy metal having a large powder particle diameter (4 Peeling is liable to occur between the surface of the sheet 1) and the thermoplastic resin composition 3, resulting in cracking of the bullet and lack of strength.

In addition, the powder particle diameter is large and easily segregates locally, making it impossible to form a homogeneous material, thereby degrading the quality of the material. In addition, when heavy metal 4 having a large powder particle diameter appears on the surface of the bullet, roughness of the surface of the bullet increases, the roughness of the surface increases, and the distance between the spirals in the barrel deteriorates and the performance deteriorates as a bullet. Therefore, the powder particle diameter of the heavy metal 4 with large powder particle diameter is 30-150 micrometers.

If the heavy metal 4 having a large powder particle diameter is less than 30 mass% with respect to the total mass of the heavy metal, the effect of adding the heavy metal 4 having a large powder particle diameter becomes less, and the kneading resistance is increased when extruding. If the heavy metal 4 having a large powder particle diameter exceeds 70 mass% with respect to the total mass of the heavy metal, a bridge is formed inside the extruder during extrusion, and the screw inside the extruder tends to be broken. In addition, peeling easily occurs between the surface of the heavy metal 4 having a large powder particle diameter and the thermoplastic resin composition 3, causing cracks in the molded article (tank), resulting in insufficient strength. Therefore, the heavy metal 4 with large powder particle diameter shall be 30-70 mass% with respect to a gross mass.

Next, a binder for improving the interfacial adhesion between the thermoplastic resin composition and the heavy metal will be described. This binder is one type of surfactant added when kneading a thermoplastic resin composition and a heavy metal, and has both a group having affinity for a resin in one molecule and a group having affinity for a metal. It is.

For this reason, interfacial adhesiveness can be improved and the crack of the peeling formation product of a thermoplastic resin composition and a heavy metal can be prevented. As this binder, the titanium-based binder was dissolved in n-propyl alcohol to be in the range of 0.2 to 1 and 0 mass% based on the total mass of the heavy metal. In addition to the titanium-based binder, a silane-based binder or an aluminum-based binder may be used.

An example of the manufacturing procedure of the bullet material which becomes such a compound is demonstrated. For the first time, polypropylene (PP) is mixed with starch-based biodegradable and water-soluble biodegradable additives in a mass ratio of 80 to 20. And the plasticizer which consists of dioctyl phthalate (DOP) is added to this mixture, and it mixes with a powder mixer.

Next, a mixture of the biodegradable additive and the plasticizer as additives to the polypropylene (PP) was put into an extruder, heated to melt, extruded, and cut to have a diameter of about 0.5 mm and a length of about 0.5 to 1.0 mm. A columnar resin pellet is formed.

Next, the surface of the heavy metal and the heavy metal and the polymer resin, in which a heavy metal (4) having a large particle size of tungsten and a heavy metal (5) having a small particle size of a powder are mixed at an appropriately selected ratio, in a separate process from the above-described resin pellets. Titanium-based binders for improving the interfacial adhesion with the molecules are mixed. Specifically, the titanium-based binder is dissolved by mixing with n-propyl alcohol at a temperature of 50 ° C. for about 1 hour, dissolved, and added to the resin pellet. Next, the binder added to the heavy metal is dried in a drying furnace.

Next, this binder and the heavy metal are mixed, and a plasticizer, an additive, and an elastomer are added and formed to a polymer resin as needed. The resin pellets are mixed with a powder mixer. Next, a mixture of the resin pellets and heavy metals is put into an extruder, and the resin pellets and heavy metals fed into the extruder are heated and extruded into a cooling chamber with a cooling device without cutting from the extruder with a screw inside the extruder.

This cold air system cools the thermoplastic resin composition containing the heavy metal which is compressed in the molten state in the extrusion port. The thermoplastic resin composition containing the heavy metal cooled by the cold wind device is cooled. It cuts by the pelletizer equipped with the hot cutter which cuts the thermoplastic resin composition containing the heavy metal cooled by the cold wind device by the rotary blade, and becomes pellet shape. A thermoplastic resin composition containing heavy metal cut into pellets is pelletized in a state in which it is welded by heat.

Next, the thermoplastic resin composition containing the pellet heavy metal is put into a damper to be mixed well after a certain amount is collected in a crusher. After these steps, a pellet material of a thermoplastic resin composition containing pellet-shaped heavy metal is produced.

Since the thermoplastic resin composition according to the embodiment of the present invention thus prepared is mixed with a biodegradable polymer resin, a tungsten having a large powder particle diameter and a heavy metal mixed with tungsten having a small powder particle diameter, the polymer resin is an extruder. As the polymer resin becomes molten inside and then cooled, the polymer resin acts as a binder for binding heavy metals having large and small powder particle diameters, so that heavy metals having large and small powder particle diameters can be deeply contained in the thermoplastic resin composition.

In addition, since a biodegradable thermoplastic resin composition and a heavy metal of tungsten are used, even if left in the natural environment, it is decomposed by microorganisms and the like and does not adversely affect the natural environment. Tungsten has no toxicity, such as lead, and does not pollute the environment. Since plasticizer is added to the polymer resin, the fluidity of the polymer resin can be improved. As a result, the contact state between the polymer resin and the metal surface of the heavy metal at the time of heat kneading the polymer resin with the heavy metal having a large and small particle diameter can be made good.

In other words, the thermoplastic resin composition having good fluidity can be sent around the surface of the heavy metal having a large and small particle diameter, so that the gap between them can be suppressed and the two can be firmly adhered to each other. In addition, since the binder is added to the resin pellets formed by using a plasticizer in the polymer resin, the surface of the heavy metal is coated to increase affinity with the thermoplastic resin composition, thereby preventing peeling at the interface.

Next, in order to manufacture a bullet, a thermoplastic resin composition containing the pellet-shaped heavy metal is introduced into an injection molding machine, which is another extruder, and injected into a plurality of bullet molds to be molded into a specific shape bullet. As shown in FIG. 2, the shaped bullet is filled with heavy metals inside the thermoplastic resin composition 3. The heavy metal filled in the thermoplastic resin composition 3 may be a heavy metal 4 having a large powder particle diameter and a heavy metal 5 having a small powder particle diameter uniformly dispersed in the thermoplastic resin composition 3. There is a number.

In this way, after the bullet was formed, the bullet material was surface-treated in order to improve rotation by the spiral when passing through the barrel of the bullet when fired by a pistol or the like. Surface treatment methods include metal plating, resin coating, and molybdenum disulfide coating. In metal plating, calcium carbonate is mixed with additives.

Calcium carbonate is uniformly dispersed by mixing 1-30% by mass of particles having a particle size of 10 μm, preferably 0.1 to 5 μm, more preferably about 3 μm, and then molding it into a bullet. Dipping dissolves the calcium carbonate particles present on the surface. Next, it is decomposed and immersed in the metal salt aqueous solution obtained by depositing a metal (preferably copper), and a so-called chemical metal plating layer (copper plating layer) is formed on the surface.

The metal (copper) plating layer is used as an anode, and the metal (copper) consisting of an electrolytic plating layer is used as a cathode, and the water-soluble water of the metal (copper) salt is electrolyzed into a medium to form a metal (copper) layer on the chemical metal (copper) plating layer. An electroplating layer is formed. In addition, a metal (for example, chromium) coated on the plating layer of the first layer using this electroplating layer as an anode is water-soluble to the cathode and the metal (for example, chromium) salt composed of the second layer. It decompose | disassembles and the said plating layer of a 2nd layer is obtained. Aluminum plating can also be performed by the same method.

Moreover, as a resin coating agent of another method, fluorine-type resin coating agents, such as a poly tetrafluoro ethylene (PTFE) and a tetrafluoro ethylene copolymer (ETFE), can be used. These resin coating agent solutions are sprayed and coated. Polytetrafluoro ethylene (PIFE) is sprayed onto a bullet material and left to stand at room temperature for 60 minutes, whereby the film thickness to be cured is 3 to 15 µm. In addition, the ionoma coating as the resin coating is a coating by dipping a bullet into the ionoma resin solution. Alternatively, the molybdenum disulfide coating is cured by injecting molybdenum disulfide powder into the bullet and left for 30 minutes at 40 ° C., for example, and the film thickness is 5 to 10 μm.

In this way, a bullet material was formed, molded into a bullet, and then tested on a 9 mm pistol bullet coated with or coated on the surface of the bullet. The specific gravity is 3 types of 4/8 / 11.3, polypropylene (PP), stainless steel (SUS), tungsten (W) is selected and mixed with each other, and a binder, n-propyl alcohol, dioctyl phthalate (plasticizer), The carbonaceous material to which the additive containing calcium carbonate was appropriately added was formed and formed into 9 mm pistol bullets, and then surface treated.

In addition, although metal plating is selected from copper plating (Cu plating) and aluminum plating (Al plating), chromium plating may also be applied. In addition, the resin coating is selected as the ionoma coating, ethylene may also be applied to poly tetrafluoro. In addition, the surface treatment of the molybdenum disulfide coating was selected. These mixing ratios are as follows, and these are shown in Table 2.

However, additives other than specific gravity adjusting substance (heavy metal) and polymer resin are other mixing ratios.

(1) Mixing ratio (unit: mass%) which forms the bullet of specific gravity 4

◇ Specific gravity adjustment material SUS 86.5

◇ Polymer resin PP 13.5

◇ Additives ‥‥‥ binder SUS × 1

n-propyl alcohol (solution) SUS × 10

Calcium Carbonate Carbide Material × 2

(2) Mixing ratio (unit: mass%) to adjust the bullet of specific gravity 8

◇ Specific gravity adjusting substance W 92.7

◇ Polymer resin PP 7.3

◇ Additives ‥‥‥ binder W × 0.35

n-propyl alcohol (solution) W × 4

Dioctyl phthalate (plasticizer) PP × 4

Calcium Carbonate Carbide Material × 2

(3) Mixing ratio (unit: mass%) to adjust the bullet of specific gravity 11.3

◇ Specific Gravity Composition W 96.5

◇ Polymer resin PP 3.5

◇ Additives ‥‥‥ binder W × 0.35

n-propyl alcohol (solution) W × 5

Fudalsan Hexyl (plasticizer) PP × 12.5

Calcium Carbonate Carbide Material × 2

9mm Pistol Bullets: An Overview of the Bullets Used in the Fire Performance Evaluation Test importance Test sign Main composition (mass%) Additive composition (mass%) PP SUS W Binder n-propyl alcohol Dioctyl phthalate Calcium carbonate Surface treatment 4 4A 13.5 86.5 - One 10 - - none 4B 2 Cu plating on 4A: 10㎛ 4C 2 Al plating on 4A: 10㎛ 8 8A 7.3 - 92.5 0.35 4 3 - none 8B 2 Cu plating on 8A: 10㎛ 8C 2 Al plating on 8A: 10㎛ 8D - Ionomer coating on 8A 8E - 8A = 2 molybdenum sulfide coating 11.3 11A 3.9 - 96.5 0.35 5 12.5 - none 11B 2 Cu plating on 11A: 10㎛ 11C 2 Al plating on 11A: 10㎛

In addition, each additive of Table 2 is a mixing ratio, and the standard of each mixing ratio is as follows: binder n-propyl alcohol is the mass% with respect to a specific gravity adjuster. Dioctyl phthalate (DOP) is mass% relative to polypropylene (PP). In addition, calcium carbonate is the mass% with respect to the whole carbon material.

The actual shots were fired at various specific surface treatments at the specific gravity of 4/8 / 11.3. The results of the actual fire test are shown in Table 3.

9mm pistol bullets: shooting performance evaluation test importance Test sign Bullet mass (g) Surface treatment Launch amount (g) Initial speed (m / s) Accuracy (MR value) [25m point] [mm] Emergency 4 4A 3.1 none 0.15 286 35 Traverse 0.20 355 39 Traverse 4B 3.2 Cu plating: 10㎛ 0.15 285 17 Good 0.20 352 19 Good 4C 3.2 Al plating: 10㎛ 0.15 286 15 Good 0.20 354 20 Good 8 8A 6.5 none 0.15 236 33 Good 0.20 291 42 Traverse 8B 6.6 Cu plating: 10㎛ 0.15 231 22 Good 0.20 290 19 Good 8C 6.6 Al plating: 10㎛ 0.15 233 24 Good 0.20 290 22 Good 8D 6.5 Ionomer coating 0.15 233 22 Good 0.20 292 27 Good 8E 6.5 Molybdenum Sulfide Coating 0.15 235 24 Good 0.20 293 26 Good 11.3 11A 8.5 none 0.15 225 37 Good 0.20 272 47 Good 11B 8.5 Cu plating: 10㎛ 0.15 222 19 Traverse 0.20 270 24 Good 11C 8.5 Al plating: 10㎛ 0.15 224 24 Good 265 25 Good

In addition, the firing dose was made into two types, 0.15 g and 0.20 g. Accuracy is the average value of the average radius of 10 shots x 3 enemies per shot. The accuracy of hit accuracy is determined by placing the target position at 25m from the muzzle and using the average radius MR = ∑Z / N (where N is the number of shots) at the target (point C) as shown in FIG. Value was evaluated.

Review the results

4A, 8A, and 11A, which have not been surface-treated at specific gravity of 4/8 / 11.3, have a performance problem in which the accuracy of accuracy exceeds the MR value of 30 mm. Also, in the case of non-compliance, the lateral bullet (the bullet rotated to the side) was prominent, particularly in the case of a large amount of shot. It is thought that the relationship with the spiral of the muzzle is not good. The surface treatment of copper plating (Cu plating), aluminum plating (Al plating), ionomer coating, and molybdenum bisulfide coating with specific gravity 4/8 / 11.3 has improved surface properties, which is related to the spiral, The rotational rotation was improved, the trajectory was stabilized, and the results were satisfactory in terms of accuracy and non-compliance of all bullets.

Since it is as above-mentioned, this invention has the following effects.

According to the invention of claim 1, since the polymer resin is excellent in corrosion resistance, even if the bullet according to the present invention is stored for a long time, it does not deteriorate. In addition, by mixing heavy metals, a bullet material can be formed with a specific gravity or a low specific gravity equivalent to that of a lead using a conventional lead, and thus, a bullet having a power characteristic or a low power characteristic equivalent to a bullet using lead can be selectively configured. In addition, since the bullet according to the present invention does not use lead, it is nontoxic and has an effect that does not adversely affect the environment or animals.

Further, according to the invention of claim 2, since the biodegradable additive naturally decomposes the thermoplastic resin composition, even if the fired bullet is left in the ground or in water, the biodegradable additive is decomposed by microorganisms and the like, and thus does not pollute the environment.

In addition, according to the invention of claim 3, since the elastomer exhibits rubber elasticity at room temperature, it is possible to form a bullet material having an emergency characteristic suitable for the purpose by acting to increase the elasticity of the bullet and reducing the mixing ratio thereof. That is, it can be made into a low emergency bullet or a non-normal bullet by raising the mixing ratio of an elastomer, and can be made into a high emergency bullet by lowering a mixing ratio, and it can be set as a bullet for various uses. In addition, by lowering the mixing ratio of the elastomer, it is possible to select the mixing ratio with other substances, which makes it possible to set the fracture characteristics suitable for the purpose.

According to the invention of claim 4, the heavy metal is mixed with a heavy metal having a small particle diameter of 1 to 3 μm and a heavy metal having a powder particle diameter of 30 to 150 μm, thereby lowering the kneading resistance to break the screw of the molding machine or the like. Since peeling with a thermoplastic resin composition can be prevented, productivity improvement can be aimed at. In addition, by setting the powder particle diameter of the heavy metal having a small powder particle diameter to 1 to 3 µm, it is possible to prevent the powder from scattering during the operation, thereby improving the working environment and reducing the manufacturing cost. Further, since the powder particle diameter of the heavy metal having a large powder particle diameter is set to 30 to 150 µm, there is no crack or lack of strength of the bullet, and the surface of the bullet can be smoothly formed to maintain the strength and smoothness of the bullet.

In addition, according to the invention of claim 5, the material of the heavy metal is appropriately selected and blended with various heavy metals such as tungsten, stainless steel, iron, copper, or aluminum. It is possible to broadly reduce the bullet of a characteristic.

In addition, according to the invention of claim 6, the surface of the bullet after molding can be subjected to surface treatment such as metal plating, resin coating, molybdenum disulfide coating, and the like, and rotates along the spiral when firing through the barrel in which the spiral is formed. It serves to improve the rotational characteristics of the bullets, thereby maintaining at least an accuracy of accuracy equivalent to that of conventional ordinary bullets.

In addition, according to the invention of claim 7, the bullet material can easily produce a bullet having a low power characteristic having a low specific gravity by mixing the thermoplastic resin composition with the powdered glass.

In addition, according to the invention of claim 8, since the bullet material is a mixture of a thermoplastic resin composition and a powdered heavy metal and glass, by adjusting the specific gravity by adding or subtracting the mixing ratio between the heavy metal with a high specific gravity and the glass with a low specific gravity, a wide range of power characteristics Suitable bullets can be produced.

Further, according to the invention of claim 9, the specific gravity of the bullet after being formed into a specific shape is 2 to 13.5, so that the low specific gravity of the low specific gravity, the high specific gravity of the large specific gravity, or the medium of the intermediate powerful characteristic is used. It can be manufactured in a wide range.

Claims (9)

A thermoplastic material is prepared from a thermoplastic resin composition containing a plasticizer added to a thermoplastic polymer resin, a heavy metal in the form of powder particles for adjusting the specific gravity of the bullet, and a binder for improving the interfacial adhesion between the thermoplastic resin composition and the heavy metal. The fire extinguisher bullet, characterized in that the bullet material is formed into a bullet having a specific shape. The fire extinguisher bullet according to claim 1, wherein a biodegradable additive for naturally decomposing the polymer resin is added to the thermoplastic resin composition. The fire extinguisher bullet according to claim 1, wherein an elastomer for increasing the elasticity of the bullet is added to the thermoplastic resin composition. The fire extinguisher bullet according to claim 1, wherein the heavy metal contains a heavy metal having a powder particle diameter of 1 to 3 µm and a heavy metal having a powder particle diameter of 30 to 150 µm. The fire extinguisher bullet according to claim 1, wherein the heavy metal is made of one of tungsten, stainless steel, iron, copper, aluminum, or a combination thereof. The bullet for the fire extinguisher according to claim 1, wherein the bullet formed after the specific shape has a surface treated by any one selected from metal plating, resin coating, and molybdenum disulfide coating. delete delete The fire extinguisher bullet according to claim 1, wherein the bullet after being formed in the specific shape has a specific gravity of 2 to 13.5.