CN111546880B

CN111546880B - Oil leakage preventing oil tank after bullet striking and preparation method thereof

Info

Publication number: CN111546880B
Application number: CN202010438698.0A
Authority: CN
Inventors: 翟文; 甄建军; 何金迎; 魏汝斌; 陈青香; 王小伟; 冯永强; 董彬; 李金鹿
Original assignee: Shandong Sanda Technology Development Co ltd; Shandong Non Metallic Material Research Institute
Current assignee: Shandong Sanda Technology Development Co ltd; Shandong Non Metallic Material Research Institute
Priority date: 2020-04-13
Filing date: 2020-05-21
Publication date: 2023-09-29
Anticipated expiration: 2040-05-21
Also published as: CN111546880A

Abstract

The invention relates to the field of special oil tanks for vehicles, in particular to an oil leakage-proof oil tank with a brand new structure after bullet striking, wherein the bullet-facing surface and the bullet-backing surface of the oil tank are of double-wall structures, and the bullet-facing surface is respectively an oil tank body outer metal plate, a metal grid, an open-cell soft foam, a fiber reinforced resin plate, an elastomer layer and an oil tank inner metal plate from outside to inside; the structure of the oil tank with the back elastic surface is an oil tank inner metal plate, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside, the fiber reinforced resin composite material is used for inhibiting the tearing of the elastic penetration to the back of the metal, the phenomenon that the elastomer cannot shrink automatically due to the tearing of the metal of the oil tank body after the elastic penetration is avoided, and the bullet hole is sealed by the characteristic of self-shrinking after the elastic penetration of the elastomer layer; the fuel tank is free from leakage after being sprung by storing micro-leakage fuel through the supporting metal plate and the open-cell foam. Compared with the oil tank hanging bulletproof material, the invention has obvious weight reduction effect.

Description

Oil leakage preventing oil tank after bullet striking and preparation method thereof

Technical Field

The invention relates to the field of special oil tanks for vehicles, in particular to an oil leakage prevention oil tank after bullet striking and a preparation method thereof.

Background

Oil is a source of power for various motor vehicles and is also a flammable and explosive liquid, so the oil tank as a military vehicle is one of the important points of being hit by enemy. Once the oil tank of the military vehicle is hit by a bullet, the oil tank firstly causes the rapid leakage of oil, so that the vehicle loses power and causes non-fight fighter reduction; secondly, oil leaks, is extremely easy to cause combustion and explosion, and causes serious injury to vehicles and personnel. Ensuring the safety of the fuel tank of the vehicle is an important precondition for ensuring the safety of weaponry and personnel and ensuring the performance of the weaponry.

The oil tank of the traditional military vehicle is generally a steel and aluminum metal oil tank, when the metal oil tank is hit by a bullet, the bullet hole of the bullet facing surface is generally larger than the diameter of the bullet by 0.5-2 mm due to the rotation of the bullet during high-speed flying, and the inner side of the bullet facing surface is torn in a circular hole stretching shape; if the bullet penetrates the oil tank, the back of the oil tank is torn in an open mode, and the reverse side of the oil tank is turned outwards, the damage state is completely different from that of the bullet-facing side, and a great amount of fuel oil is instantaneously leaked. For the protection of military vehicle oil tanks, technological staff have conducted a lot of research.

CN 107825957A discloses a military bulletproof protective oil tank shell and a preparation method thereof. The military oil tank shell is sequentially from outside to inside: the composite bulletproof and explosion-proof composite shell comprises an impact-resistant layer, a hard bulletproof layer, a composite bulletproof and explosion-proof layer, a composite sealing layer and a metal shell core layer. The impact-resistant layer, the hard bulletproof layer, the composite bulletproof and explosion-proof layer and the composite sealing layer are integral multi-layer structural components, can be assembled with the metal shell core layer into a whole through the metal bolt connecting device, and can ensure the integral oil seepage prevention and the protection capability of various gun bullets (pistol bullets, walking bullets, explosion fragments and the like) through the external composite oil tank fittings of the multi-layer structure.

CN 207160646U discloses a bulletproof oil tank which is leak-proof. The oil tank comprises an oil tank body and an oil suction pipe mechanism, wherein the oil tank body comprises an anti-corrosion coating, a molding metal layer, a first foam metal buffer layer, a rubber layer, a first fireproof layer, an inner steel sheet layer, a second foam metal buffer layer, a fiber fabric bulletproof layer and an outer steel sheet layer which are sequentially arranged from inside to outside, the oil suction pipe mechanism comprises an oil suction pipe and a sealing cover body, the sealing cover body protrudes out of the outer surface of the oil tank body, an open-pore metal cylinder extending into the oil tank body is arranged in the sealing cover body, and a heat dissipation mechanism is arranged on the outer side of the sealing cover body. The product has good anti-elastic performance, can effectively prevent oil gas leakage and oil tank explosion, and greatly improves the reliability. It can be seen that the protective performance of the oil tank can be obviously improved by hanging the bulletproof composite material on the oil tank, but the weight gain is obvious.

The principle of protecting the oil tank by adding the composite armor is to realize 'no advance of bullets', so that the safety of the oil tank is ensured, but the protection performance of the composite armor has strict requirements on bullet types, for example, if the added composite armor prevents 53-mm armor-piercing combustion bullets of 7.62mm, when encountering more powerful bullet types, the composite armor cannot protect the oil tank, so that the protection effect is single, and the weight gain effect on a vehicle body is serious.

The light weight of the military equipment is an effective guarantee for improving the maneuverability and the fight force, and through the structural design of the oil tank and the application of new materials, the oil tank is free from leakage or only generates trace leakage after being sprung under the condition of minimum weight increment, and the method has important significance for improving the fight force of the military equipment.

Disclosure of Invention

Aiming at a plurality of defects of the prior bulletproof oil tank, the invention provides a leakage-proof oil tank with a brand new structure after bullet striking, wherein the bullet-facing surface and the bullet-backing surface of the oil tank are both of double-wall structures, and the bullet-facing surface is respectively a metal plate-metal grid outside the oil tank body and an open-cell soft foam-fiber reinforced resin plate-elastomer layer-metal plate inside the oil tank from outside to inside; the structure of the oil tank with the back elastic surface is an oil tank inner metal plate, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside, the fiber reinforced resin composite material is used for inhibiting the tearing of the elastic penetration to the back of the metal, the phenomenon that the elastomer cannot shrink automatically due to the tearing of the metal of the oil tank body after the elastic penetration is avoided, and the bullet hole is sealed by the characteristic of self-shrinking after the elastic penetration of the elastomer layer; the fuel tank is free from leakage after being sprung by supporting the metal pipe and the open-cell foam to store the fuel with micro leakage. Compared with the method for hanging the bulletproof material on the oil tank, the method realizes the effect of 'the bulletproof material is beaten into or penetrates through the oil tank without oil leakage', and has the effects of wider bulletproof variety and obvious weight reduction.

The specific technical scheme of the invention is as follows:

the oil leakage preventing oil tank after bullet striking has a brand new structure, wherein the bullet facing surface and the bullet backing surface of the oil tank are of double-wall structures, and the bullet facing surface is respectively a metal plate-metal grid outside the oil tank body and an open-cell soft foam-fiber reinforced resin plate-elastomer layer-primer-metal plate inside the oil tank from outside to inside; the structure of the oil tank with the back elastic surface is composed of an oil tank inner metal plate, a primer, an adhesive, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside;

the scheme can be suitable for clearly determining the conditions of the bullet facing surface and the bullet backing surface of the oil tank in the use process, such as a vehicle oil tank with common protection requirements;

based on the technical scheme, the inventor further expands a more comprehensive technical scheme as follows:

the oil leakage preventing oil tank after full protection and bullet protection has five sides with double wall structure, including outer metal plate, metal grille, open cell soft foam, fiber reinforced resin plate, elastomer layer, primer, fiber reinforced resin plate, adhesive, primer and inner metal plate. The technical scheme can realize penetration of bullets on any surface and penetration of explosion fragments at the bottom to the oil tank without oil leakage, so that better protection can be provided for the vehicle oil tank with high protection requirements;

Whichever of the above solutions is adopted, the materials and compositions used therein are the same and are not distinguished by differences in the protection level, wherein:

in the two technical schemes, the double-wall spacing in the double-wall structures of the elastic facing surface and the elastic backing surface of the oil tank shell or the other five surfaces outside the top of the oil tank can be the same or different, preferably 10-200 mm, and further preferably 15-80 mm.

The outer metal plate and the inner metal plate of the oil tank are made of one or more of common metal materials of the oil tank, such as steel, special steel, armored aluminum, magnesium alloy, titanium alloy and the like. The choice of materials is a matter of routine in the art and the inventors do not limit them separately.

The metal grid material is preferably exemplified by, but not limited to, steel, special steel, armored aluminum, magnesium alloy, and titanium alloy.

The thickness of the metal grid plate is preferably 0.5 to 10mm, and more preferably 1 to 5mm.

The section of the metal grating plate is L-shaped, the inner angle of the L-shaped is an obtuse angle, the length of the L-shaped is not larger than the width of the oil tank surface, and the short side length of the metal grating plate is H ₁ The vertical height of the long side is H ₂ The short side is connected with the inner side of the outer metal plate of the oil tank in a welding or riveting mode, and the distance H between the two metal grating plates in the vertical direction is H ₂ <h<H ₂ +D _{Bullet diameter} ，

Besides, a flat plate type grid can be adopted, the shape of which is shown in figure 5, the length of the flat plate type grid is not more than the width of the oil tank surface, the non-welding surface inclines to the top of the oil tank, the included angle between the non-welding surface and the metal plate outside the oil tank body is an acute angle alpha, as shown in figure 6, the distance h between two metal grid plates in the vertical direction is in the range of b multiplied by cos alpha to b multiplied by cos alpha+D _{Bullet diameter} Wherein b is the width of the flat grid,

the two grid patterns can be selected according to requirements, such as light-weight grids when the weight is strictly required.

The open-cell flexible foam refers to a foam material which is insoluble in gasoline or diesel oil for a corresponding vehicle, the open-cell ratio is preferably not less than 50%, more preferably not less than 80%, and the open-cell flexible foam is not limited to one or more of polyurethane open-cell flexible foam, PE open-cell flexible foam or EVA open-cell flexible foam, or the open-cell flexible foam is directly foamed in the grille clearance by using a foaming material with the performance of a finished product.

The fiber reinforced resin plate is a plate formed by compounding fibers with resin after being treated by a certain means; wherein the fiber is glass fiber, aramid fiber, polyethylene fiber, poly-p-phenylene and di-p-phenyleneOne or more fibers selected from azole fibers (PBO fibers), carbon fibers and basalt fibers; in addition, the fiber can be one or more of unidirectional cloth, UD cloth, woven cloth or felt cloth which are formed by the fibers and are mixed to form a layer structure, and the two modes need to be combined with resin to form corresponding plates;

The resin in the fiber reinforced resin sheet is not limited to thermoplastic films which are formed by one or more of EVA resin, polyurethane resin, vinyl resin, epoxy resin and phenolic resin and can be used for hot press molding or liquid resin which can be used for infusion process; the resin content by weight in the fiber reinforced resin sheet is preferably 20 to 70%, more preferably 30 to 60%.

The thickness of the fiber reinforced resin sheet is preferably 2 to 30mm, more preferably 5 to 15mm;

the fiber reinforced resin plate can be directly prepared by adopting the materials by utilizing the prior art, or can be prepared by adopting products meeting the requirements on the market, and the products are specific according to the requirements;

the elastomer resin is preferably an elastomer resin with hardness between Shore A0 and Shore A99, and more preferably an elastomer resin with hardness between Shore A65 and Shore A90 and containing isocyanate groups in the molecular chain. Examples are, but not limited to, ke poly V6060, E455, LF1900 polyurethane prepolymer, shandong institute of nonmetallic materials XJ-4092 polyurethane prepolymer, WS T5028 super thick film protective coating WS T601 prepolymer, etc.

The thickness of the elastomer resin in the tank interlayer is preferably 1 to 100mm, more preferably 3 to 50mm.

The thickness of the separator is preferably 0.02 to 1mm, and is not limited to polyester films or polycarbonate films, for example.

The primer is a material known in the art to have surface adhesion improving properties, and is not limited to a compound or a mixture containing an epoxy group or an isocyanate group, for example.

Except for special descriptions, the components are all products directly purchased in the market, and the inventor does not need to describe the components in detail here.

The function and effect of each functional layer are as follows:

the metal grille is mainly used for changing the trajectory of the projectile or the explosive fragment and attenuating energy, and meanwhile, the space formed by the inclined arrangement of the metal grille can store trace leakage fuel and avoid the leakage of the fuel.

The open-cell foam is arranged between the metal grids to fill the aperture between the metal grids, so that when the open-cell foam is broken down, the open-cell foam can absorb leaked trace fuel by utilizing the space of the open-cell foam;

the metal grids and the fiber reinforced resin plates can be fixedly connected without an adhesive or in other modes, and the fiber reinforced resin plates can prevent the elastomer liquid resin from flowing into the grids when the elastomer resin is poured later, and further attenuate the energy of the projectile by utilizing the fiber strength of the elastomer liquid resin and the elasticity of the resin;

The elastomer resin can automatically shrink after being broken down by utilizing the self-shrinkage characteristic of the elastomer resin so as to seal the bullet hole and prevent fuel leakage;

the fiber reinforced resin plate with the back elastic surface or the fiber reinforced resin plate close to the metal plate in the oil tank has the main effects that the self strength is utilized to inhibit the tearing of the elastic penetration on the metal substrate, so that the situation that the elastomer resin cannot shrink automatically caused by the outward turning tearing of the metal of the oil tank body is prevented, and the energy of the shots is consumed, thereby avoiding the leakage of fuel from the penetration opening;

the isolating film is used for isolating the outer metal plate of the elastic body back elastic surface oil tank, and if the elastic body breaks down the outer metal plate of the oil tank, a certain space is formed by the breakdown deformation of the outer metal plate, so that a trace amount of leaked fuel is stored; because of the effect of the multiple layers, the bullet speed is greatly attenuated, and too large tearing is not caused even if the bullet runs through the bullet, so that a certain space is formed between the deformed part of the outer metal plate of the oil tank and the isolating membrane, and the leakage of fuel can be prevented due to the small leakage of the fuel;

in view of the above, the oil tank provided by the application has the advantages that the elastic holes are closed by the self-contraction characteristic of the elastomer layer, the metal base plate is prevented from penetrating and tearing by the fiber reinforced resin plate, and the micro-leaked fuel is stored by the metal grid space and the open-cell foam, so that the oil tank is free from leakage after being sprung. Compared with the oil tank with the bulletproof material, the application has the advantages of wider protection applicability and obvious weight reduction.

The inventor further provides a preparation method of the elastic face interlayer:

(1) preparation of a metal grid: cutting metal plate, bending into L-shaped section with obtuse angle, wherein the short side length of metal grating plate is H ₁ The vertical height of the long side is H ₂ ；

(2) Processed metal grille H ₁ The surface is welded on the inner side of the metal plate outside the spring facing surface of the oil tank body, and the interval between two metal grating plates in the vertical direction is H ₂ ～H ₂ +D _{Bullet diameter} Then cleaning the interlayer, and removing oil stain residues or other visible dirt;

(3) polishing the outer side of the metal plate in the spring facing surface of the oil tank body, and coating primer;

(4) filling open-cell soft foam in the gaps of the grids or foaming the foam in the gaps of the grids by adopting an on-site foaming process, repairing the foam along the grids to make the outer sides of the foam flat, so that the subsequent bonding of the fiber reinforced resin plates is facilitated;

(5) placing the fiber reinforced resin plate subjected to surface treatment closely to the metal grid vertically between the grid and the metal plate gap in the elastic facing surface, and enabling the fiber reinforced resin plate to be closely attached to the metal grid, and bonding by adopting an adhesive if necessary;

(6) when the liquid resin pouring process is adopted, elastomer resin is injected into a gap between the fiber reinforced resin plate and the metal plate in the tank body of the oil tank, and the preparation of the elastic face is completed after solidification. If an elastomer plate is adopted, the adhesive which is firmly bonded after verification is smeared on two bonding surfaces of the elastomer plate, so that the two surfaces of the elastomer plate are respectively fixedly connected with the fiber reinforced resin plate and the inner metal plate;

Through the steps, the manufacturing of the bullet-facing surface of the oil tank body is completed.

The preparation method of the back elastic surface interlayer comprises the following steps:

(1) polishing the outer side of the metal plate in the back elastic surface of the oil tank body, cleaning, removing oil stain residues or other visible dirt, and coating primer containing isocyanate structures;

(2) treating the surface of a fiber reinforced resin plate, coating a primer containing an isocyanate structure on both surfaces, and firmly bonding the fiber reinforced resin plate and the outer side of a metal plate in a back elastic surface oil tank by using an adhesive containing an isocyanate structure;

(3) laying an isolating film on the inner side of the metal plate outside the back elastic surface of the oil tank body;

(4) when the liquid resin pouring process is adopted, elastomer resin is injected into a gap between the fiber reinforced resin plate and the isolating membrane, and the back elastic surface preparation is completed after solidification; if an elastomer plate is adopted, the surface of the elastomer plate which is required to be bonded with the fiber reinforced resin plate is coated with an adhesive which is firmly bonded after verification, so that the elastomer plate is fixedly connected with the fiber reinforced resin plate

Through the steps, the manufacturing of the back elastic surface of the oil tank body is completed.

And fixing the upper cover of the oil tank with the tank body of the oil tank to finish the preparation of the oil tank.

The preparation method of the leak-proof oil tank after full protection bullet has the following specific steps:

(2) Processed metal grille H ₁ The surface is welded on the inner side of the metal plate outside the oil tank body, and the interval between two metal grating plates in the vertical direction is H ₂ ～H ₂ +D _{Bullet diameter} Then cleaning the interlayer, and removing oil stain residues or other visible dirt;

(3) polishing the outer side of the metal plate in the oil tank body, and coating primer;

(4) filling open-cell soft foam in the gaps of the metal grids or foaming the foam in the gaps of the grids by adopting an on-site foaming process, repairing the foam along the grids to make the outer sides of the foam flat, so that the subsequent bonding of the fiber reinforced resin plates is facilitated;

(6) treating the surface of another fiber reinforced resin plate, coating a primer containing an isocyanate structure on both bonding surfaces of the fiber reinforced resin plate, and then firmly bonding the fiber reinforced resin plate and the outer side of the metal plate in the oil tank by using an adhesive containing an isocyanate structure;

(7) When the liquid resin casting process is adopted, elastomer resin is injected into a gap between two fiber reinforced resin plates, and the preparation of the elastomer facing surface is completed after solidification; if an elastomer plate is adopted, the adhesive which is firmly bonded after verification is smeared on the two bonding surfaces of the elastomer plate, and the adhesive is put into a gap between two fiber reinforced resin plates and firmly bonded.

When the flat plate grating is adopted, a welding process is adopted, the flat plate grating is firmly welded on the inner side of the outer metal plate of the oil tank according to the designed included angle alpha, and other steps are identical to the steps.

The double-wall structure of the bullet-facing surface and the bullet-backing surface of the oil tank shell, or five surfaces of the full-protection oil tank except the top surface can be designed before the oil tank is produced, and the existing oil tank can be additionally arranged by a necessary processing means.

The double-wall spacing in the double-wall structures of the bullet facing surface and the bullet backing surface of the oil tank shell or the double-wall structures of the five surfaces except the top surface of the full-protection oil tank can be the same or different, preferably 10-200 mm, and further preferably 15-80 mm; the thickness of each functional layer can be adjusted according to the actual situation.

Compared with the oil tank added with the bulletproof material, the oil tank obtained by the method has the advantages that the surface of the oil tank can be treated by adopting the traditional oil tank surface treatment process, such as sand blasting, stealth coating, and the like, so that penetration of multiple bullets and explosion fragments to the oil tank can be prevented, fuel leakage is avoided, and the weight reduction is obvious. The preparation method has the advantages of simple steps, easily purchased raw materials, low cost, controllability, good leakage prevention effect and easy popularization, and is suitable for striking bullets with the bullet diameters of 12.7mm and below without oil leakage.

Drawings

Figure 1 is a schematic view of the cross-section of the tank obtained according to the application,

figure 2 is a schematic view of the longitudinal section of the tank obtained according to the application,

as can be seen from fig. 1 and fig. 2, the spring facing surface and the spring back surface of the oil tank are both double-wall structures, and the spring facing surface is respectively a metal plate-metal grid outside the oil tank body and an open-cell soft foam-fiber reinforced resin plate-elastomer layer-primer-metal plate inside the oil tank from outside to inside; the structure of the oil tank with the back elastic surface is composed of an oil tank inner metal plate, a primer, an adhesive, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside;

figure 3 is a schematic view of the longitudinal section structure of the oil tank of the full-protection oil tank,

the oil tank is sequentially provided with an oil tank outer metal plate, a metal grating, open-cell foam materials filled among the gratings, a fiber reinforced resin plate, an elastomer layer, a fiber reinforced resin plate and an oil tank inner metal plate from outside to inside;

FIG. 4 is a schematic view of an L-shaped metal grid used in the present application;

FIG. 5 is a schematic view of a flat metal grid used in the present application;

fig. 6 is a schematic view of the weld fixture in a tank when a flat metal grid is used in the present application.

Detailed Description

The above-described aspects of the present application will be described in further detail by way of the following embodiments, but it should not be construed that the scope of the above-described subject matter of the present application is limited to the following examples. All techniques realized based on the above description of the present application are within the scope of the present application, and the following examples are accomplished by conventional techniques unless otherwise specified.

In the following embodiments, the oil tank may follow the external structural design scheme of the original oil tank, the metal used may be any one of steel, special steel, armored aluminum, magnesium alloy, titanium alloy, etc., the bullet facing surface and the bullet backing surface of the oil tank are determined, the interlayer design may be that the bullet facing surface and the bullet backing surface of the oil tank are externally connected or the inner sides of the bullet facing surface and the bullet backing surface are respectively welded or riveted with plates made of the same or different materials as the tank body of the oil tank, and the welding or riveting positions are ensured not to leak, the double-wall spacing is preferably 10-200 mm, and further preferably 15-80 mm. The specific scheme can be flexibly selected according to requirements.

Besides, a flat plate type grating with the section not larger than the width of the oil tank surface, the non-welding surface inclined to the top of the oil tank, the included angle between the non-welding surface and the metal plate outside the oil tank body is an acute angle alpha, the distance h between two metal grating plates in the vertical direction is in the range of b multiplied by cos alpha to b multiplied by cos alpha+D _{Bullet diameter} Wherein b is the width of the flat grid,

for example:

the hot press molding process comprises the following steps: taking EVA resin adhesive film as an example, cutting an aramid fiber woven cloth with certain surface density and an EVA resin film into a designed size, orderly and alternately laying the aramid fiber woven cloth and the EVA adhesive film, putting the aramid fiber woven cloth and the EVA adhesive film into a preheated flat press, cutting the aramid fiber woven cloth and the EVA adhesive film into the designed size by using high-pressure water cutting equipment according to the designed size after the pressing is finished, and airing the aramid fiber woven cloth and the EVA adhesive film to finish the preparation of the fiber reinforced resin layer;

taking swancor905 vinyl resin as an example, cutting aramid fiber woven cloth according to the number of layers and the size of the design, putting the cut cloth on a glass workbench, sequentially paving a demolding cloth and a flow guide net, sealing a vacuum bag, checking whether air leakage exists, adding a catalyst and an initiator into the weighed vinyl resin, uniformly stirring, introducing the mixture into the paved vacuum bag by utilizing pressure difference, curing, and cutting according to requirements to finish the preparation of the fiber reinforced resin layer. The elastic-facing fiber reinforced resin layer needs to be firmly bonded with the elastomer layer, and the elastic-back fiber reinforced resin layer needs to be firmly bonded with the metal plate in the elastic-back surface.

In addition to the above products, the products can be prepared by the existing processes, for example:

taking a casting polyurethane elastomer as an example, the molding process comprises the following steps: the casting equipment adopts a Bolei compact casting machine, the melted prepolymer and the curing agent are respectively added into corresponding charging tanks, casting parameters are set, and the casting equipment is respectively cast into a gap between the fiber reinforced resin plate in the bullet facing surface and the metal plate in the bullet facing surface and a gap between the fiber reinforced resin plate and the isolating membrane in the back bullet facing surface, and after complete curing, the elastomer layer manufacturing is completed.

The elastomer layer must bond firmly with the inner metal plate on the elastic face, the bonding strength is more than or equal to 2MPa, the elastomer layer must bond firmly with the fiber reinforced resin layer on the elastic face, the bonding strength is more than or equal to 0.5MPa, the thickness of the elastomer resin in the oil tank interlayer is preferably 1-100 mm, and more preferably 3-50 mm.

All the components adopt products directly purchased in the market except special descriptions.

Example 1

The spring facing surface and the back spring facing surface of the oil tank are designed into double-wall structures, and the spring facing surface is respectively a metal plate-metal grille outside the oil tank body and an open-cell soft foam-fiber reinforced resin plate-elastomer layer-metal plate inside the oil tank from outside to inside; the structure of the oil tank with the back elastic surface is composed of an oil tank inner metal plate, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside.

The gap between the facing spring surface and the double wall is 30mm, and the gap between the back spring surface and the double wall is 15mm.

And (3) oil tank base material treatment: polishing the outer side of the metal plate in the spring facing surface of the oil tank, the outer side of the metal plate in the back spring facing surface and the bottom surface of the interlayer by using 60-mesh abrasive cloth, cleaning by using acetone, and brushing primer containing epoxy groups.

The metal grating adopts Q235 steel plate with the thickness of 1 mm. Firstly, cutting a steel bar with the width of 25mm and the length of 21.2mm, bending the steel bar into an angle a of 135 degrees at the position of 21.2mm in the width direction of the steel bar with the width of 25mm according to the width of an oil tank, welding the steel bar with the width of 21.2mm at the included angle of the bullet-facing surface and the bottom of the oil tank, welding the short side of the bent steel bar at the inner side of the bullet-facing surface of the oil tank according to the interval of 15mm at the included angle of 45 degrees with the bottom of the oil tank.

Cutting polyurethane soft foam with the aperture ratio of more than 90% into prisms with the side length of 16mm, and sequentially placing the prisms into a grid gap.

Fiber reinforced resin sheet: the DuPont k129 fiber is woven into square cloth with the surface density of 410g and EVA adhesive film with the thickness of 0.03mm which are alternately paved, and the square cloth and EVA adhesive film are hot pressed into a 5mm plate with the resin content of 30 percent by a flat vulcanizing machine and cut according to the size. Brushing a primer containing epoxy groups on one surface of the fiber reinforced resin plate facing the bullet, and putting the metal plate facing the oil tank into a gap between the grid and the metal plate facing the bullet by tightly attaching the metal plate facing the primer to the grid; the special priming paint containing epoxy groups is coated on two sides of the fiber reinforced resin plate for the back elastic surface, and after the priming paint is dried, two-component polyurethane structural adhesive which is purchased in the market is coated on one side, for example, but not limited to YB2003/YB8001 two-component polyurethane structural adhesive of Shanghai Hansi industry limited company, and then the adhesive coating surface is firmly adhered with the outer side of a metal plate in an oil tank of the back elastic surface, and the adhesive strength is more than or equal to 1MPa.

Isolation film: cutting a polyester film with the thickness of 0.02mm, and adhering the polyester film on the inner side of the metal plate outside the back elastic surface by using double-sided adhesive tape.

Elastomer layer: the XJ-4092 polyurethane prepolymer produced by Shandong nonmetallic material research is used for casting the XJ-4092 polyurethane prepolymer and the commercial diethyl toluenediamine (E100) into gaps between a fiber reinforced resin plate on an elastic face and a fiber reinforced resin plate on an inner metal plate and a back elastic face and a separation film by adopting a casting process, wherein the tensile strength is more than 30MPa, the hardness is Shore A80, the Bolei compact type casting machine is used for casting the Bolei compact type, and the preparation of the bulletproof oil tank body is completed after solidification.

According to 1X 1m of the bullet-facing surface, the weight of the protective structure is increased by 30kg, and according to 1X 1m of the bullet-facing surface, the weight of the back surface is increased by 17kg, and according to a shooting test, the fuel tank can not leak fuel oil under the condition that the bullet with the caliber below 12.7mm breaks down the fuel tank.

Example 2

The spring facing surface and the back spring facing surface of the oil tank are designed into double-wall structures, and the spring facing surface is respectively a metal plate-metal grille and an open-cell soft foam-fiber reinforced resin layer-elastomer layer-metal plate in the oil tank body from outside to inside; the structure of the oil tank with the back elastic surface is composed of an oil tank inner metal plate, a fiber reinforced resin plate, an elastomer material, an isolation layer and an oil tank outer metal plate from inside to outside.

The gap between the facing spring surface and the double wall is 50mm, and the gap between the back spring surface and the double wall is 25mm.

And (3) oil tank base material treatment: polishing the outer side of the metal plate in the spring facing surface of the oil tank, the outer side of the metal plate in the back spring facing surface and the bottom surface of the interlayer by using 60-mesh abrasive cloth, cleaning by using acetone, and brushing primer containing isocyanate groups.

The metal grille is made of stainless steel plate with thickness of 2 mm. Firstly, cutting a steel bar with the width of 55mm and the length of 50mm, bending the steel bar into an angle a of 150 degrees at the position of 50mm in the width direction of the steel bar with the width of 55mm according to the width of the oil tank, welding the steel bar with the angle a of 50mm at the position of an included angle between the bullet-facing surface and the bottom of the oil tank, welding the short side of the bent steel bar at the inner side of the bullet-facing surface of the oil tank according to the interval of 43.3mm at the included angle between the bullet-facing surface and the bottom of the oil tank of 60 degrees.

Cutting PE soft foam with aperture ratio more than 90% into prisms with side length of 44mm, and sequentially placing into a grid gap.

Fiber reinforced resin sheet: the high-strength glass fiber reinforced resin plate with the thickness of 10mm is prepared by adopting a vacuum diversion process through the high-strength glass fiber woven check cloth with the surface density of 400g and the swancor905 vinyl resin, the resin content is 40%, and the glass fiber reinforced resin plate is cut according to the size. Brushing special priming paint containing epoxy groups on two sides of the fiber reinforced resin plate, brushing priming paint containing isocyanate groups on one side of the fiber reinforced resin plate facing the bullet, and putting the priming paint facing the metal plate in the oil tank close to the grid into a gap between the grid and the metal plate in the bullet facing surface; the fiber reinforced resin plate for the back elastic surface is coated with special primer containing epoxy groups on two sides, after the primer is dried, one side of the primer is coated with the UK8103/UK5400 double-component polyurethane structural adhesive for fine chemical engineering of Shanghai great wall city, and then the adhesive surface is firmly adhered to the outer side of the metal plate in the oil tank of the back elastic surface, and the adhesive strength is more than or equal to 1MPa.

Isolation film: cutting a polyester film with the thickness of 0.05mm, and sticking the polyester film on the inner side of the metal plate outside the back elastic surface by using double-sided adhesive tape.

Elastomer layer: LF1900 polyurethane prepolymer produced by Ke poly company is used, the tensile strength is more than 35MPa, the hardness is Shore A90, a manual casting process is adopted, the LF1900 polyurethane prepolymer and the dimethyl thiotoluene diamine (E300) are stirred uniformly and the defoamed glue solution is cast into gaps between a fiber reinforced resin plate on an elastic facing surface and an inner metal plate and between a fiber reinforced resin plate on a back elastic surface and a separation film, and after solidification, the preparation of the bulletproof oil tank body is completed.

According to 1X 1m of the bullet-facing surface, the weight of the protective structure is increased by 58kg, and according to 1X 1m of the bullet-facing surface, the weight of the back bullet-facing surface is increased by 37kg, and according to a shooting test, the fuel tank can not leak fuel oil under the condition that the bullet with the caliber below 12.7mm breaks down the fuel tank.

Example 3

The gap between the facing spring surface and the double wall is 80mm, and the gap between the back spring surface and the double wall is 66mm.

The metal grating is made of a titanium alloy plate with the thickness of 5 mm. Firstly, cutting a 30mm wide strip, and further cutting a 21.2mm titanium alloy strip, bending the length of the strip according to the width of the oil tank at the position of 21.2mm in the width direction of the 30mm wide titanium alloy strip to form an angle a of 135 degrees, welding the 21.2mm titanium alloy strip at the included angle between the elastic facing surface and the oil tank bottom, forming an included angle of 45 degrees with the oil tank bottom, and riveting the short side of the bent titanium alloy strip at the inner side of the elastic facing surface of the oil tank according to the interval of 15 mm.

Cutting EVA soft foam with aperture ratio greater than 80% into prisms with side length of 16mm, and sequentially placing into the grating gap.

Fiber reinforced resin sheet: a sheet having a thickness of 15mm was pressed with PEUD cloth having an areal density of 160g and cut to size. Brushing special primer containing carbamate groups on two sides of the fiber reinforced resin plate, and putting the side facing the elastic surface close to the grille into an interlayer; the fiber reinforced resin plate with the back elastic surface is smeared with UK88/UK5400 double-component polyurethane structural adhesive of Shanghai Youfu commercial company, and is adhered to the outer side of the metal plate in the back elastic surface, and the adhesive strength is more than or equal to 0.5MPa.

Isolation film: cutting into polycarbonate sheet with thickness of 1mm, and sticking the polycarbonate sheet on the inner side of the metal plate outside the back elastic surface by using double-sided adhesive tape.

Elastomer layer: WS T601 polyurethane prepolymer produced by Shandong nonmetallic material research is vulcanized into a polyurethane plate with the thickness of 50mm, the tensile strength is more than 25MPa, the hardness is Shore A85, an adhesive is smeared, gaps between a fiber reinforced resin plate on the elastic facing surface and an inner metal plate and gaps between a fiber reinforced resin plate on the elastic backing surface and a separation film are respectively arranged, the adhesive strength is ensured to be more than or equal to 1MPa, and the preparation of the bulletproof oil tank body is completed.

According to 1X 1m of the bullet-facing surface, the weight of the protective structure is increased by 110kg, and according to 1X 1m of the bullet-facing surface, the weight of the back surface is increased by 66kg, and according to a shooting test, the fuel tank can not leak fuel oil when a bullet with the caliber of 12.7mm breaks down the fuel tank on the outer surface of the fuel tank.

Example 4

The gap between the facing spring surface and the double wall is 60mm, and the gap between the back spring surface and the double wall is 60mm.

The metal grille is made of bulletproof aluminum plate with the thickness of 4 mm. Firstly, cutting 55mm wide strips, and further cutting a 50mm aluminum strip, wherein the length is according to the width of the oil tank, the angle a is 135 degrees at the 50mm position of the 55mm wide bulletproof aluminum strip in the width direction, and the angle between the elastic face and the oil tank bottom is 45 degrees. And riveting the short sides of the bent bulletproof aluminum strips on the inner side of the bullet-facing surface of the oil tank according to the distance of 35 mm.

Cutting polyurethane soft foam with the aperture ratio of more than 80% into prisms with the side length of 35mm, and sequentially placing the prisms into a grid gap.

Fiber reinforced resin sheet: the elastic facing surface is alternately paved by aramid fiber felt cloth and EVA adhesive film with the thickness of 0.05mm, and is hot pressed into a 5mm plate by a plate vulcanizing machine, wherein the resin content is 60 percent, and the plate is cut according to the size. The back elastic surface is woven by basalt fiber into square cloth with the surface density of 400g and swancor905 vinyl resin, a vacuum diversion process is adopted to prepare a high-strength glass fiber reinforced resin plate with the thickness of 20mm, the resin content is 55 percent, and the plate is cut according to the size. Brushing a primer containing epoxy groups on one surface of the fiber reinforced resin plate facing the bullet, and putting the metal plate facing the oil tank into a gap between the grid and the metal plate facing the bullet by tightly attaching the metal plate facing the primer to the grid; the back elastic surface is coated with special primer containing epoxy groups on two surfaces of a fiber reinforced resin plate, one surface of the primer is coated with toughening epoxy 2022AB glue produced by the market-available Edet investment Co., ltd after the primer is dried, and then the adhesive coated surface is firmly adhered to the outer side of a metal plate in an oil tank of the back elastic surface, and the adhesive strength is more than or equal to 1MPa.

Isolation film: cutting polycarbonate sheet with thickness of 0.5mm, and sticking the polycarbonate sheet on the inner side of the metal plate outside the back elastic surface by using double-sided adhesive tape.

Elastomer layer: the preparation method comprises the steps of adopting Graco-XP3, spraying WS T5028 super thick film elastomer produced by Shandong nonmetallic material research into gaps between a fiber reinforced resin plate and an inner metal plate on an elastic facing surface and between a fiber reinforced resin plate and an isolating film on a back elastic surface, wherein the material stretching strength is more than 20MPa, and the hardness is Shore A85, so that the preparation of the bulletproof oil tank body is completed.

According to 1X 1m of the bullet-facing surface, the weight of the protective structure is increased by 84kg, and according to 1X 1m of the bullet-facing surface, the weight of the back surface is increased by 60kg, and according to a shooting test, the fuel tank can not leak fuel on the outer surface of the fuel tank under the condition that a bullet with the caliber of 12.7mm breaks down the fuel tank.

Example 5

The gap between the facing spring surface and the double wall is 45mm, and the gap between the back spring surface and the double wall is 20mm.

The metal grille adopts a magnesium alloy plate with the thickness of 3mm and a stainless steel plate with the thickness of 1.5 mm. Firstly, cutting a magnesium alloy plate into a 50mm wide strip, and cutting a stainless steel strip with the length of 42.5mm, wherein the length is bent into an angle a of 135 degrees at the position of 42.5mm in the width direction of the 50mm wide magnesium alloy strip according to the width of an oil tank, and the angle between the elastic face and the oil tank bottom is welded with the stainless steel strip with the length of 42.5mm, wherein the angle between the elastic face and the oil tank bottom is 45 degrees. And riveting the short sides of the bent magnesium alloy strips at the inner side of the spring facing surface of the oil tank according to the interval of 30 mm.

And sequentially injecting polyurethane soft foam resin with the foaming aperture ratio of more than 95% into the gaps of the grids, and trimming the foam outside the grids after foaming.

Fiber reinforced resin sheet: the face of the bullet is alternately paved by using k129 fiber of DuPont company to weave square cloth with the surface density of 410g and EVA adhesive film with the thickness of 0.03mm, hot-pressed into a 5mm plate by using a flat vulcanizing machine, the resin content is 30 percent, and the plate is cut according to the size. The back elastic surface is laid by a plain cloth interlayer with 200g of twill cloth and 170 g of PBO fiber woven by carbon fiber, and is prepared into a 10mm thick high-strength glass fiber reinforced resin plate with 50% of resin content by adopting a vacuum flow guiding process by using epoxy resin, and is cut according to the size. Brushing a primer containing epoxy groups on one surface of the fiber reinforced resin plate facing the bullet, and putting the metal plate facing the oil tank into a gap between the grid and the metal plate facing the bullet by tightly attaching the metal plate facing the primer to the grid; special priming paint containing epoxy groups is coated on two sides of a fiber reinforced resin plate for back elastic surface, and after the priming paint is dried, one side of the priming paint is coated with commercially available Shanghai hansi Utility Co., ltdAnd then, the adhesive surface is firmly adhered to the outer side of the metal plate in the oil tank with the back elastic surface, and the adhesive strength is more than or equal to 1MPa.

Elastomer layer: the XJ 4095 polyurethane prepolymer produced by Shandong nonmetallic material research is uniformly stirred with a curing agent, and is poured into an elastic facing surface interlayer and a back elastic surface interlayer after defoamation in a vacuum oven, wherein the stretching strength of the material is more than 15MPa, and the hardness is Shore A65, so that the preparation of the bulletproof oil tank body is completed.

According to 1X 1m of the bullet-facing surface, the weight of the protective structure is increased by 28kg, and according to 1X 1m of the bullet-facing surface, the weight of the back surface is increased by 21kg, and according to a shooting test, the fuel tank can not leak fuel oil on the outer surface of the fuel tank under the condition that a bullet with the caliber of 12.7mm breaks down the fuel tank.

Example 6

The metal grille is made of stainless steel plate with the thickness of 1.5 mm. The stainless steel plate is cut into strips with the width of 50mm, the stainless steel strips are sequentially welded upwards at the included angle between the bullet-facing surface and the bottom of the oil tank, the included angle between the stainless steel strips and the inner side of the bullet-facing surface of the oil tank is 45 degrees, and the spacing is arbitrarily selected between 35.4 and 42 mm.

Fiber reinforced resin sheet: alternating layering of 200g square grid cloth with 0.03mm thick EVA adhesive film woven by k129 fiber of DuPont company, hot-pressing into 5mm plate with resin content of 30% by a flat vulcanizing machine, and cutting according to the size. Brushing a primer containing epoxy groups on one surface of the fiber reinforced resin plate facing the bullet, and putting the metal plate facing the oil tank into a gap between the grid and the metal plate facing the bullet by tightly attaching the metal plate facing the primer to the grid; special priming paint containing epoxy groups is coated on two sides of a fiber reinforced resin plate for back elastic surface, and after the priming paint is dried, one side of the priming paint is coated with commercially available Shanghai hansi Utility Co., ltdAnd then, the adhesive coating surface is firmly adhered to the outer side of the metal plate in the oil tank with the back elastic surface, and the adhesive strength is more than or equal to 1MPa.

Elastomer layer: the XJ 4095 polyurethane prepolymer produced by Shandong nonmetallic material research is uniformly stirred with melted 4, 4-methylene bis (2-chloroaniline), and is poured into an elastic facing surface and elastic backing surface interlayer after being defoamed in a vacuum oven, the material stretching strength is more than 15MPa, and the hardness is Shore A70, so that the preparation of the bulletproof oil tank body is completed.

Example 7

Oil leakage preventing oil tank after full protection bullet and preparation method thereof

Except the top of the oil tank, the other surfaces are designed into double-wall structures, and the double-wall structures are respectively a metal plate-metal grille and an open-cell soft foam-fiber reinforced resin layer-elastomer layer-fiber reinforced resin plate-metal plate in the oil tank body from outside to inside.

The double wall gap was 40mm.

And (3) oil tank base material treatment: the outer side of the metal plate in the oil tank is polished by 60-mesh abrasive cloth, and is cleaned by acetone and then is coated with primer containing isocyanate.

And sequentially injecting polyurethane soft foam resin with the foaming aperture ratio of more than 90% into the gaps of the grids, and trimming the foam outside the grids after foaming.

Fiber reinforced resin sheet: a sheet having a thickness of 5mm was pressed with PEUD cloth having an areal density of 160g and cut to size. One of the two fiber reinforced resin plates is coated with special primer containing carbamate groups on one side, and the other two sides are coated with the primer on one side, and the primer-free surface of the fiber reinforced resin plate coated with the primer is closely attached to the grille and placed in a gap between the grille and the inner metal plate; a fiber reinforced resin plate with double-sided priming paint is coated with commercial Darson material technology HJ-966/GC-966 double-component epoxy structural adhesive on one side, and is adhered to the outer side of a metal plate in an oil tank, wherein the adhesive strength is more than or equal to 1MPa.

Elastomer layer: the V6060 polyurethane prepolymer which is uniformly mixed with 1, 4-butanediol is poured into a gap between fiber reinforced resin plates by a casting machine of the type V6060 polyurethane prepolymer, the tensile strength of which is more than 30MPa, the hardness of which is Shore A65 and the Bolei compact, and after solidification, the preparation of the full-protection oil tank body is completed.

According to 1X 1m calculation, the weight of the whole protection structure is increased by 35kg, and through a shooting test, the fuel oil leakage does not occur on the outer surface of the fuel oil tank under the condition that the projectile and the explosion fragments with the caliber below 12.7mm break down the fuel oil tank.

Claims

1. An oil leakage prevention oil tank after bullet, its characterized in that: the spring-facing surface and the spring-back surface of the oil tank are of double-wall structures, and the spring-facing surface is respectively a metal plate-metal grille and an open-cell soft foam-fiber reinforced resin plate-elastomer layer-primer-metal plate in the oil tank body from outside to inside; the structure of the oil tank with the back elastic surface is composed of an oil tank inner metal plate, a primer, an adhesive, a fiber reinforced resin plate, an elastomer resin, an isolation layer and an oil tank outer metal plate from inside to outside;

the metal grille material is selected from one of steel, armored aluminum, magnesium alloy and titanium alloy; the section of the metal grating plate is L-shaped or flat plate-shaped, and the inner angle of the L-shaped is an obtuse angle;

the thickness of the metal grating plate is 0.5-10 mm, and the short side length of the L-shaped metal grating plate is H ₁ The vertical height of the long side is H ₂ The short side is connected with the inner side of the outer metal plate of the oil tank in a welding mode, the distance between the two metal grating plates in the vertical direction is the distance H, and the value range of H is H ₂ <h<H ₂ +D _{Bullet diameter;}

when the flat plate type grille is selected, the length is not larger than the width of the oil tank surface,the non-welding surface is inclined to the top of the oil tank, the included angle between the non-welding surface and the metal plate outside the oil tank body is an acute angle alpha, the distance h between two metal grating plates in the vertical direction is in the range of b multiplied by cos alpha to b multiplied by cos alpha+D _{Bullet diameter} Wherein b is the width of the flat grid;

the open-cell soft foam is selected from one or more of polyurethane open-cell soft foam, PE open-cell soft foam or EVA open-cell soft foam;

the fiber reinforced resin plate is a plate formed by compounding fibers with resin after being treated; wherein the fiber is one or more of glass fiber, aramid fiber, polyethylene fiber, poly-p-phenylene-diazole fiber, carbon fiber or basalt fiber;

the resin in the fiber reinforced resin plate is one or more selected from EVA resin, polyurethane resin, vinyl resin, epoxy resin and phenolic resin; the weight content of the resin in the fiber reinforced resin plate is 20-70%;

the elastomer resin is selected from elastomer resins with the hardness between Shore A65 and Shore A90 and isocyanate groups in the molecular chain; the thickness of the elastomer resin in the interlayer of the oil tank is 3-50 mm;

the thickness of the isolation layer is 0.02-1 mm, and the isolation layer is selected from a polyester film or a polycarbonate film.

2. The post-impact oil leakage prevention oil tank according to claim 1, wherein: the oil leakage preventing oil tank after full protection and bullet protection has five sides with double wall structure, including outer metal plate, metal grille, open cell soft foam, fiber reinforced resin plate, elastomer layer, primer, fiber reinforced resin plate, adhesive, primer and inner metal plate.

3. The post-impact oil leakage prevention oil tank according to claim 1 or 2, wherein:

the open pore ratio of the open-cell soft foam is more than or equal to 50%, or the foam material with the same performance as the open-cell soft foam is selected for the finished product to be directly foamed in the metal grille gap.

4. The post-impact oil leakage prevention oil tank according to claim 1, wherein:

the thickness of the metal grille plate is 1-5 mm, and the open-cell soft foam aperture ratio is more than or equal to 80%.

5. The post-impact oil leakage prevention oil tank according to claim 1, wherein:

the fiber reinforced resin board is a board formed by compounding one or more mixed layering structures of unidirectional cloth, UD cloth, woven cloth or felt cloth formed by fibers and resin, wherein the fibers are one or more of glass fibers, aramid fibers, polyethylene fibers, poly-p-phenylene-diazole fibers, carbon fibers or basalt fibers.

6. The post-impact oil leakage prevention oil tank according to claim 1 or 2 or 5, wherein:

the weight content of the resin in the fiber reinforced resin plate is 30-60%, and the thickness of the fiber reinforced resin plate is 2-30 mm.

7. The post-impact oil containment tank of claim 6, wherein:

The thickness of the fiber reinforced resin plate is 5-15 mm.

8. The method for preparing the oil leakage prevention oil tank after bullet striking as claimed in claim 1, which is characterized by comprising the following specific steps:

the preparation method of the bullet-facing interlayer comprises the following steps:

(2) Processed metal grille H ₁ The surface is welded on the inner side of the metal plate outside the spring facing surface of the oil tank body, and the interval between two metal grating plates in the vertical direction is H ₂ ～H ₂ +D _{Bullet diameter} Then cleaning the interlayer;

(4) filling open-cell soft foam in the gaps of the metal grids or foaming the gaps of the metal grids by adopting an on-site foaming process, repairing the foam along the grids to make the outer sides of the foam flat, and facilitating the subsequent bonding of the fiber reinforced resin plates;

(5) placing the fiber reinforced resin plate subjected to surface treatment closely to the metal grid vertically between the grid and a metal plate gap in the elastic facing surface, enabling the fiber reinforced resin plate to be closely attached to the metal grid, and bonding the fiber reinforced resin plate by adopting an adhesive;

(6) when the liquid resin casting process is adopted, elastomer resin is injected into a gap between the fiber reinforced resin plate and a metal plate in the tank body of the oil tank, and the preparation of the elastic face is completed after solidification; through the steps, the manufacturing of the bullet-facing surface of the oil tank body is completed;

(1) polishing the outer side of the metal plate in the back elastic surface of the oil tank body, cleaning up, and coating primer containing isocyanate structures;

(3) laying an isolation layer on the inner side of the metal plate outside the back elastic surface of the oil tank body;

(4) when the liquid resin pouring process is adopted, elastomer resin is injected into a gap between the fiber reinforced resin plate and the isolation layer, and the back elastic surface preparation is completed after solidification; through the steps, the manufacturing of the back elastic surface of the oil tank body is completed.

9. The method for preparing the oil leakage prevention oil tank after bullet striking as claimed in claim 2, which is characterized by comprising the following specific steps: the oil-leakage-preventing oil tank after bullet-loading is a full-protection oil-leakage-preventing oil tank after bullet-loading,

(2) Processed metal grille H ₁ The surface is welded on the inner side of the metal plate outside the oil tank body, and the interval between two metal grating plates in the vertical direction is H ₂ ～H ₂ +D _{Bullet diameter} Then cleaning the interlayer;

(3) polishing the outer side of a metal plate in the oil tank body, and coating primer on the outer side of the inner metal plate;

(7) when the liquid resin casting process is adopted, elastomer resin is injected into the gap between the two fiber reinforced resin plates, and the preparation of the elastomer facing surface is completed after solidification.