Rubber-plastic blended composition for airgun pellets and preparation method of rubber-plastic pellets

Abstract

The invention discloses a rubber-plastic blend composition for airgun projectiles. The composition comprises 100 parts of a rubber-plastic blend, 5-50 parts of a plasticizer, 0.5-5 parts of paraffin, 10-60 parts of an inorganic filler, 0.5-3 parts of an antioxidant, and 0.1-0.3 parts of a vulcanizing agent. The airgun projectile using the rubber-plastic blend composition comprises a shell and an internal filler; the shell is composed of an upper and a lower part, and the material is a rubber-plastic blend composition; the internal filler is a barium sulfate powder or a calcium carbonate powder. The airgun projectile prepared by the present invention has a lower lethality, and improves the flight stability and hit accuracy of the projectile.

Description

Technical Field

[0001] The present invention generally relates to the field of chemical technology, and more specifically, to a rubber-plastic blended composition for airgun pellets and a method for preparing the rubber-plastic pellets. Background Art

[0002] With the development of society and the increasing attention paid to humanitarian concepts, non-lethal weapons are becoming more and more important. In terms of riot control and dispersal, airguns have more advantages than gunpowder weapons, and the bullets they use are also constantly developing to meet the needs of society. In order to reduce the lethality of bullets, some flexible materials are usually used to wrap lead bullets to play a certain buffering role, such as "bean bag" bullets and nylon bullets. However, due to the relatively small density of the wrapping material, the mass of the bullet is reduced, which will have a certain impact on the flight stability of the bullet, thereby affecting the accuracy of the bullet. In order to improve accuracy, nylon bullets are enhanced at the tail of the bullet, but the accuracy is still not ideal, and after the nylon bullet hits the target, the fabric will be broken and cause environmental pollution. In addition, there are some elastomeric bullets or thermoplastic cast bullets filled with lead powder or lead shot. During the shooting process, this type of bullet has the function of absorbing the kinetic energy of the bullet, thereby reducing the lethality of the bullet, but due to the low density of this type of material, the flight stability of the bullet is relatively poor, and the accuracy is also affected to a certain extent. Therefore, air gun bullets need further research to reduce their lethality while ensuring the bullets' flight stability and accuracy in hitting targets. Summary of the invention

[0003] The present invention provides a rubber-plastic blend composition for airgun projectiles, characterized in that the rubber-plastic composition comprises the following components in parts by weight: 100 parts of a rubber-plastic blend; 5-50 parts of a plasticizer; 0.5-5 parts of paraffin; 10-60 parts of an inorganic filler; 0.5-3 parts of an antioxidant; and 0.1-0.3 parts of a vulcanizing agent.

[0004] According to one embodiment of the present invention, the rubber-plastic blend is composed of a blend of two or more of polyethylene resin, polypropylene resin, and ethylene-propylene rubber.

[0005] According to one embodiment of the present invention, the weight proportion of the ethylene-propylene rubber is 1 to 10 parts.

[0006] According to one embodiment of the present invention, the plasticizer is an ester compound, preferably one or a mixture of two or more of dibutyl phthalate (DBP), dioctyl phthalate (DOP) and dioctyl sebacate (DOS).

[0007] According to one embodiment of the present invention, the inorganic filler is one of white carbon black, calcium carbonate or kaolin, or a mixture of two or more thereof.

[0008] According to one embodiment of the present invention, the antioxidant is one of antioxidant DLTP, antioxidant 1010 or antioxidant 1246, or a mixture of two or more thereof.

[0009] According to one embodiment of the present invention, the vulcanizing agent is dicumyl peroxide (DCP).

[0010] According to one embodiment of the present invention, the rubber-plastic blend composition comprises the following components in parts by weight: 100 parts of rubber-plastic blend; 15 parts of dibutyl phthalate; 1 part of paraffin; 25 parts of calcium carbonate; 0.3 parts of antioxidant 1010; 0.2 parts of antioxidant DLTP; and 0.2 parts of diisopropyl peroxide.

[0011] An airgun projectile containing a rubber-plastic blend composition, characterized in that it comprises a shell and an internal filler; the shell consists of an upper part and a lower part, and the material is the rubber-plastic blend composition; the internal filler is barium sulfate powder or calcium carbonate powder.

[0012] A method for preparing airgun pellets containing a rubber-plastic blend composition, comprising:

[0013] (1) 100 parts of a rubber-plastic blend, 5-50 parts of a plasticizer, 0.5-5 parts of paraffin wax, 10-60 parts of an inorganic filler, 0.5-3 parts of an antioxidant, and 0.1-0.3 parts of a vulcanizer are blended in a blender for 5-10 minutes to obtain a mixed material; (2) the mixed material is respectively injected into the upper and lower molds of an airgun projectile shell, and injection molding is performed at 130° C.-210° C. to obtain the upper and lower parts of the airgun projectile shell; (3) powder is filled into the upper and lower parts of the airgun projectile shell, and the upper and lower parts are buckled together, and the buckled parts are melted together by an ultrasonic hot melt welding process to obtain an airgun projectile.

[0014] The rubber-plastic blended composition for airgun projectiles of the present invention is prepared by blending plastic and rubber, and adding inorganic fillers, plasticizers, paraffin, antioxidants, etc. Through the synergistic effect between the materials, the rubber-plastic airgun projectiles prepared have lower lethality and effectively improve the flight stability and hitting accuracy of the projectiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Overall view of the rubber-plastic projectile.

[0016] Figure 2 The upper part of the rubber-plastic projectile.

[0017] Figure 3 The lower part of the rubber-plastic projectile. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below. Reference numerals refer to components and technologies in the present invention so that the advantages and features of the present invention can be more easily understood when implemented in a suitable environment. The following description is a concretization of the claims of the present invention, and other specific implementations related to the claims that are not explicitly described also belong to the scope of the claims.

[0019] The present invention provides a rubber-plastic blend composition for airgun projectiles, characterized in that the rubber-plastic composition comprises the following components in parts by weight: 100 parts of a rubber-plastic blend; 5-50 parts of a plasticizer; 0.5-5 parts of paraffin; 10-60 parts of an inorganic filler; 0.5-3 parts of an antioxidant; and 0.1-0.3 parts of a vulcanizing agent.

[0020] According to one embodiment of the present invention, the rubber-plastic blend is composed of a blend of two or more of polyethylene resin, polypropylene resin, and ethylene-propylene rubber.

[0021] The polyethylene resin in the present invention has excellent dielectric properties, chemical corrosion resistance, low temperature resistance and good processing flowability, and medium and low molecular weight polyethylene is preferred. Polyethylene resin, polypropylene resin and ethylene propylene rubber are blended to improve the strength and toughness of air gun pellets. However, ethylene propylene rubber is not easy to be blended too much, and the weight ratio is 1 to 10 parts. If more ethylene propylene rubber is mixed, the air gun pellet is not easy to break after being shot out.

[0022] According to one embodiment of the present invention, the plasticizer is an ester compound, preferably one or a mixture of two or more of dibutyl phthalate (DBP), dioctyl phthalate (DOP) and dioctyl sebacate (DOS).

[0023] According to one embodiment of the present invention, the inorganic filler is one or a mixture of two or more of white carbon black, calcium carbonate or kaolin.

[0024] According to one embodiment of the present invention, the antioxidant is one of antioxidant DLTP, antioxidant 1010 or antioxidant 1246, or a mixture of two or more thereof.

[0025] According to one embodiment of the present invention, the vulcanizing agent is dicumyl peroxide (DCP).

[0026] The present invention further improves the processing performance of the polymer blend by adding a plasticizer; adds an inorganic filler to improve the mechanical properties of the polymer blend; adds an antioxidant to prevent the polymer blend from becoming sticky, hard, brittle, etc. under the action of oxygen during processing, use and storage, thereby causing a decrease in properties such as strength.

[0027] According to one embodiment of the present invention, the rubber-plastic blend composition comprises the following components in parts by weight: 100 parts of rubber-plastic blend; 15 parts of dibutyl phthalate; 1 part of paraffin; 25 parts of calcium carbonate; 0.3 parts of antioxidant 1010; 0.2 parts of antioxidant DLTP; and 0.2 parts of diisopropyl peroxide.

[0028] The present invention provides an airgun pellet containing the above rubber-plastic blend composition, characterized in that it comprises a shell and an internal filler; the shell is composed of an upper part and a lower part, and the material is the rubber-plastic blend composition; the internal filler is barium sulfate powder or calcium carbonate powder. The structure of the airgun pellet is shown in the attached figure.

[0029] The present invention also provides a method for preparing an airgun projectile containing a rubber-plastic blend composition, comprising: (1) blending 100 parts of a rubber-plastic blend, 5-50 parts of a plasticizer, 0.5-5 parts of paraffin wax, 10-60 parts of an inorganic filler, 0.5-3 parts of an antioxidant, and 0.1-0.3 parts of a vulcanizer in a blender for 5-10 minutes to obtain a mixed material; (2) injecting the mixed material into a mold for the upper and lower parts of an airgun projectile shell, respectively, and performing injection molding at 130° C.-210° C. to obtain the upper and lower parts of the airgun projectile shell; (3) filling the upper and lower parts of the airgun projectile shell with powder, buckling the upper and lower parts together, and fusing the buckled parts together through an ultrasonic hot melt welding process to obtain an airgun projectile.

[0030] Comparative Example 1

[0031] 60 parts of polyethylene resin, 40 parts of polypropylene resin, 15 parts of DBP, 1 part of paraffin, 25 parts of calcium carbonate, 0.3 parts of antioxidant 1010 and 0.2 parts of antioxidant DLTP are added into a mixer and blended for 8 minutes to obtain a mixed material; the mixed material is respectively injection molded into the upper and lower molds of an airgun projectile shell, and injection molding is performed at 130° C.-210° C. to obtain the upper and lower parts of the airgun projectile shell; powder is filled into the upper and lower parts of the airgun projectile shell, and the upper and lower parts are buckled together, and the buckled parts are melted together through an ultrasonic hot melt welding process to obtain an airgun projectile.

[0032] Example 1

[0033] 60 parts of polyethylene resin, 39 parts of polypropylene resin, 1 part of ethylene propylene rubber, 15 parts of DBP, 1 part of paraffin, 25 parts of calcium carbonate, 0.3 parts of antioxidant 1010, 0.2 parts of antioxidant DLTP and 0.1 parts of DCP are added into a mixer and blended for 8 minutes to obtain a mixed material; the mixed material is respectively injection molded into the upper half and lower half molds of an airgun projectile shell, and injection molding is performed at 130° C.-210° C. to obtain the upper half and lower half of the airgun projectile shell; powder is filled into the upper half and lower half of the airgun projectile shell, and the upper and lower parts are buckled together, and the buckled parts are melted together through an ultrasonic hot melt welding process to obtain an airgun projectile.

[0034] Example 2

[0035] 60 parts of polyethylene resin, 35 parts of polypropylene resin, 5 parts of ethylene propylene rubber, 15 parts of DBP, 1 part of paraffin, 25 parts of calcium carbonate, 0.3 parts of antioxidant 1010, 0.2 parts of antioxidant DLTP and 0.1 parts of DCP are added into a mixer and blended for 8 minutes to obtain a mixed material; the mixed material is respectively injection molded into the upper half and lower half molds of an airgun projectile shell, and injection molding is performed at 130° C.-210° C. to obtain the upper half and lower half of the airgun projectile shell; powder is filled into the upper half and lower half of the airgun projectile shell, and the upper and lower parts are buckled together, and the buckled parts are melted together through an ultrasonic hot melt welding process to obtain an airgun projectile.

[0036] Example 3

[0037] 60 parts of polyethylene resin, 30 parts of polypropylene resin, 10 parts of ethylene propylene rubber, 15 parts of DBP, 1 part of paraffin, 25 parts of calcium carbonate, 0.3 parts of antioxidant 1010, 0.2 parts of antioxidant DLTP and 0.1 parts of DCP are added into a mixer and blended for 8 minutes to obtain a mixed material; the mixed material is respectively injection molded into the upper half and lower half molds of an air gun projectile shell, and injection molding is performed at 130° C.-210° C. to obtain the upper half and lower half of the air gun projectile shell; powder is filled into the upper half and lower half of the air gun projectile shell, and the upper and lower parts are buckled together, and the buckled parts are melted together through an ultrasonic hot melt welding process to obtain an air gun projectile.

[0038] The performance of the comparative examples and embodiments is shown in the table below.

[0039] Table 1. Performance data of examples and comparative examples

[0040]

[0041] The experimental conclusion shows that

[0042] (1) After adding EPDM, the strength of the airgun projectile is reduced to meet the product requirements. Due to the elasticity of EPDM, it not only ensures that the airgun projectile is not easy to break when loading, but also helps to reduce the lethality and break easily when hitting the target after shooting;

[0043] (2) After adding EPDM rubber, the deformation of the airgun projectile in the compressive direction under a static pressure of 30N is ≤0.5mm, which meets the product requirements;

[0044] (3) After adding EPDM rubber, the accuracy of airgun projectiles hitting the target is improved.

[0045] The air gun projectile of the present invention is blended with polyethylene resin, polypropylene resin and ethylene propylene rubber, and is added with plasticizer, inorganic filler, paraffin, antioxidant and the like. Through the synergistic effect between the materials, the prepared rubber-plastic air gun projectile has low lethality while ensuring the strength of the projectile, and the accuracy of hitting the target is improved, and the deformation in the compressive direction under a static pressure of 30N is within the product requirement range.

[0046] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation to the claims.

Claims

1. A rubber-plastic blend composition for airgun pellets, characterized in that: The rubber-plastic composition comprises the following components in parts by weight: 100 parts of rubber and plastic blend, Plasticizer 5-50 parts, 0.5-5 parts of paraffin wax, Inorganic filler 10-60 parts, Antioxidant 0.5-3 parts, Vulcanizing agent 0.1-0.3 parts; The rubber-plastic blend is composed of polyethylene resin, polypropylene resin and ethylene-propylene rubber, wherein the weight proportion of the polyethylene resin is 60 parts, and the weight proportion of the ethylene-propylene rubber is 1 to 10 parts; the plasticizer is one of dibutyl phthalate, dioctyl phthalate and dioctyl sebacate, or a mixture of two or more thereof; the inorganic filler is one of white carbon black, calcium carbonate or kaolin, or a mixture of two or more thereof; the antioxidant is one of antioxidant DLTP, antioxidant 1010 or antioxidant 1246, or a mixture of two or more thereof; and the vulcanizing agent is diisopropylbenzene peroxide.

2. The rubber-plastic blend composition according to claim 1, characterized in that: The rubber-plastic blend composition comprises the following components in parts by weight: 100 parts of rubber-plastic blend; 15 parts of dibutyl phthalate; 1 part of paraffin; 25 parts of calcium carbonate; 0.3 parts of antioxidant 1010; 0.2 parts of antioxidant DLTP; and 0.2 parts of dicumyl peroxide.

3. An airgun pellet containing the rubber-plastic blend composition according to claim 1, characterized in that: It comprises a shell and an internal filler; the shell consists of an upper part and a lower part, and the material is a rubber-plastic blended composition; the internal filler is barium sulfate powder or calcium carbonate powder.

4. The method for preparing the airgun pellet according to claim 3, comprising: (1) 100 parts of a rubber-plastic blend, 5-50 parts of a plasticizer, 0.5-5 parts of paraffin wax, 10-60 parts of an inorganic filler, 0.5-3 parts of an antioxidant, and 0.1-0.3 parts of a vulcanizing agent are blended in a blender for 5-10 minutes to obtain a mixed material; (2) injecting the mixed material into the upper and lower molds of the airgun projectile shell respectively, and performing injection molding at 130° C.-210° C. to obtain the upper and lower parts of the airgun projectile shell; (3) Powder is filled into the upper and lower halves of the airgun projectile shell, and the upper and lower halves are buckled together, and the buckled parts are melted together by ultrasonic hot-melt welding process to obtain the airgun projectile.

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