Explosion-proof and bullet-proof coating material and preparation method thereof

Abstract

The present invention relates to the technical field of chemical coating materials. The present invention provides an explosion-proof and bullet-proof coating material and a preparation method thereof. The coating material comprises a substrate layer and a composite layer, wherein the composite layer is coated on both sides of the substrate layer, and the composite layer comprises a plurality of elastomer layers, a plurality of modified layers and a plurality of filler layers, and the composite layer is arranged alternately in the order of "modified layer-filler layer-elastomer layer-filler layer" in sequence; the elastomer layer comprises the following materials: isocyanate, polytetramethylene ether polyol and 3,5-diethyltoluenediamine; the modified layer comprises the following materials: epoxy resin and chain extender; compared with the existing polyurea composite coating, the multilayer arrangement of "modified layer-filler layer-elastomer layer-filler layer" is adopted, and the effects and polarities between the functional layers are reasonably utilized to improve the adhesion between the coating materials.

Description

Technical Field

[0001] The invention relates to the technical field of chemical coating materials, and in particular to an explosion-proof and bullet-proof coating material and a preparation method thereof. Background Art

[0002] When an explosion occurs, it usually produces extremely strong shock waves and fragments, which have very serious consequences and greatly endanger the safety of people's lives and property. Therefore, in the face of such a serious emergency, the protective material needs to have the highest possible explosion and ballistic performance. In view of the penetration of fragments and the action time and load pressure amplitude of the explosion shock wave load, the required protective material / structure should have high unit mass transient specific strength and specific toughness.

[0003] In the prior art, polyurea material is an excellent impact-resistant bulletproof and explosion-proof material, among which bulletproof polyurea is an ultra-hard, ultra-tough energy-absorbing material. When a bullet hits the coating, the hardness increases rapidly to consume most of the energy, and the mesh molecular structure can hold the bullet on the back surface to prevent the bullet from penetrating; explosion-proof polyurea is an ultra-tough skin-like coating with a powerful energy absorption and conversion function. When encountering an explosion shock wave, its glass transition temperature changes rapidly, and its hardness increases dozens of times instantly, so it can withstand a huge explosion shock without being damaged, and can be used to enhance the explosion-proof capabilities of various military substrates.

[0004] However, most of the polyurea materials currently used in explosion-proof and bullet-proof protection fields have poor coating tear strength. If polyurethane coatings other than polyurea elastic coatings are used on explosion-proof materials, only polyurea elastic coatings are used to form the coatings. However, the polyurea elastic coatings have insufficient coating capacity and adhesion properties, making it impossible to effectively cover the surface of the material, resulting in low explosion-proof performance of the overall material, which cannot meet the demand for high-strength explosion-proof performance.

[0005] Therefore, the relevant technology of existing explosion-proof and bullet-proof materials still needs to be further improved. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes an explosion-proof and bullet-proof coating material and a preparation method thereof, which solves the technical problems of insufficient explosion-proof performance and poor tear strength of polyurea materials in the prior art.

[0007] The invention provides an explosion-proof and bullet-proof coating material and a preparation method thereof.

[0008] Firstly, the present invention provides an explosion-proof and bullet-proof coating material, comprising a substrate layer and a composite layer.

[0009] Wherein, the composite layer is coated on both sides of the substrate layer, and the composite layer includes a plurality of elastomer layers, a plurality of modified layers and a plurality of filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0010] The elastomer layer comprises the following raw materials: diisocyanate, polytetramethylene glycol and 3,5-diethyltoluenediamine;

[0011] The modified layer comprises the following raw materials: epoxy resin and chain extender;

[0012] The filler layer includes a carbon fiber mesh;

[0013] The preparation method of the elastomer layer is as follows: dehydrating polytetramethylene glycol under reduced pressure at 100-110° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 20-25° C. for 0.5-1 h, heating to 70-80° C. for reaction for 2-3 h, cooling, and discharging;

[0014] The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 30-35° C. for 1-2 hours under nitrogen protection.

[0015] On the basis of this technical solution, it is further preferred that the elastomer layer comprises the following materials in parts by weight: 20-40 parts of diisocyanate, 32-47 parts of polytetramethylene glycol, and 36-54 parts of 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2000-3000 g / mol;

[0016] The modified layer comprises the following materials in parts by weight: 16-30 parts of epoxy resin and 3-7 parts of chain extender.

[0017] On the basis of this technical solution, further preferably, the diisocyanate is one of toluene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate.

[0018] On the basis of this technical solution, it is further preferred that the chain extender is at least one of diethyltoluenediamine, dimethylthiotoluenediamine, N,N-dialkylmethyldiamine, N,N-dialkylphenylenediamine and isophoronediamine.

[0019] On the basis of this technical solution, it is further preferred that the composite layer is in the order of "modified layer-filler layer-elastomer layer-filler layer" alternating 5 times.

[0020] On the basis of this technical solution, further preferably, the substrate layer is a steel plate or an aluminum plate.

[0021] On the basis of this technical solution, it is further preferred that the thickness of the steel plate or aluminum plate is 6.1-7.6 mm.

[0022] On the basis of this technical solution, it is further preferred that the mesh pores of the carbon fiber mesh are 0.5-1 mm.

[0023] In a second aspect, the present invention further provides a method for preparing the above-mentioned explosion-proof and bullet-proof coating material, characterized in that the method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0024] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, and dry;

[0025] Then spraying the elastomer layer on the surface of the filler layer and drying; then spraying the filler layer on the surface of the elastomer layer and drying;

[0026] Finally, the modified layer is sprayed on the surface of the filler layer, dried, and cured, and the above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0027] On the basis of this technical solution, it is further preferred that the spraying conditions of the modified layer are 60-70° C. and 10-12 MPa.

[0028] On the basis of this technical solution, it is further preferred that the spraying conditions of the elastomer layer are 70-80° C. and 12-15 MPa.

[0029] On the basis of this technical solution, it is further preferred that the spraying conditions of the filler layer are 80-85° C. and 16-18 MPa.

[0030] The explosion-proof and bullet-proof coating material and preparation method provided by the present invention have the following beneficial effects compared with the prior art:

[0031] (1) Compared with the existing polyurea composite coating, the explosion-proof and bullet-proof coating material of the present invention adopts a multi-layer arrangement of "modified layer-filler layer-elastomer layer-filler layer" and reasonably utilizes the effects and polarities between the various functional layers to improve the adhesion between the coating materials;

[0032] (2) The setting of the filler layer in the multi-layer can disperse the mechanical stress of the filler structure, and the carbon fiber mesh can be effectively mixed with polyurea, which not only improves the bonding degree, but also improves the toughness of the explosion-proof and bullet-proof coating material, thereby significantly improving the tear strength of the explosion-proof and bullet-proof coating material;

[0033] (3) In addition, the synthesized polyurea can form a chemical bond with the fiber filler of the carbon fiber mesh to achieve an interpenetrating structure, which also improves the substrate adhesion, tensile strength, tear strength and impact resistance of the final coating material, and the explosion-proof strength is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 This is the structure of the composite layer in the explosion-proof and bullet-proof coating material of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention is based on the situation that the multi-layer coating set by the existing polyurea composite coating still has unsatisfactory tear strength, and provides an explosion-proof and bullet-proof coating material and a preparation method. The prepared explosion-proof and bullet-proof coating material has good explosion-proof performance and excellent tear strength.

[0038] Example 1

[0039] An explosion-proof and bullet-proof coating material comprises a substrate layer and a composite layer.

[0040] The substrate layer is an aluminum plate; the thickness of the aluminum plate is 6.1 mm;

[0041] The elastomer layer comprises: 20g toluene diisocyanate, 32g polytetramethylene glycol, and 36g 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2000 g / mol; and the thickness of the elastomer layer is 5mm.

[0042] The modified layer includes: 16g of epoxy resin and 3g of chain extender, and the thickness of the modified layer is 300μm.

[0043] The filler layer comprises a carbon fiber mesh with a mesh pore size of 0.5 mm.

[0044] The chain extender is diethyltoluenediamine.

[0045] Specifically, the synthesis method of the elastomer layer is as follows: dehydrating polytetramethyleneimine under reduced pressure at 110° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 25° C. for 1 hour, heating to 80° C. for reaction for 3 hours, and cooling to discharge.

[0046] Specifically, the synthesis method of the modified layer is to mix the epoxy resin and the chain extender evenly, and react at 35° C. for 2 hours under nitrogen protection.

[0047] like Figure 1 , which is a schematic diagram of the composite layer structure.

[0048] The composite layer is coated on both sides of the substrate layer, and the composite layer includes 5 elastomer layers, 5 modified layers and 10 filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0049] The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0050] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, the spraying conditions are 80° C., 16 MPa, and dry;

[0051] Then the elastomer layer is sprayed on the surface of the filler layer at 70°C, 12MPa, and dried; then the filler layer is sprayed on the surface of the elastomer layer at 80°C, 16MPa, and dried;

[0052] Finally, the modified layer is sprayed on the surface of the filler layer at 60° C. and 10 MPa, followed by drying and curing. The above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0053] Example 2

[0054] An explosion-proof and bullet-proof coating material comprises a substrate layer and a composite layer.

[0055] The substrate layer is a steel plate; the thickness of the steel plate is 7.6 mm.

[0056] The elastomer layer comprises: 40g of diphenylmethane diisocyanate, 47g of polytetramethylene ether polyol, and 54g of 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene ether polyol is 3000g / mol; and the thickness of the elastomer layer is 7mm.

[0057] The modified layer includes: 30g of epoxy resin and 7g of chain extender, and the thickness of the modified layer is 200μm.

[0058] The filler layer comprises a carbon fiber mesh with a mesh pore size of 1 mm.

[0059] The chain extender is 2g of N,N-dialkylmethyldiamine, 3g of N,N-dialkylphenylenediamine and 2g of isophoronediamine.

[0060] The preparation method of the elastomer layer is as follows: dehydrating polytetramethylene glycol under reduced pressure at 100° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 20° C. for 1 hour, heating to 70° C. for reaction for 3 hours, cooling, and discharging;

[0061] The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 30° C. for 2 hours under nitrogen protection.

[0062] The composite layer is coated on both sides of the substrate layer, and the composite layer includes 5 elastomer layers, 5 modified layers and 10 filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0063] The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0064] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, the spraying conditions are 85° C., 18 MPa, and dry;

[0065] Then the elastomer layer is sprayed on the surface of the filler layer at 80°C, 15MPa, and dried; then the filler layer is sprayed on the surface of the elastomer layer at 85°C, 18MPa, and dried;

[0066] Finally, the modified layer is sprayed on the surface of the filler layer at 70° C. and 12 MPa, followed by drying and curing. The above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0067] Example 3

[0068] An explosion-proof and bullet-proof coating material comprises a substrate layer and a composite layer.

[0069] The substrate layer is an aluminum plate, and the thickness of the aluminum plate is 7.0 mm.

[0070] The elastomer layer comprises: 30g of isophorone diisocyanate, 37g of polytetramethylene glycol, and 43g of 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2500 g / mol; and the thickness of the elastomer layer is 6mm.

[0071] The modified layer includes: 20g of epoxy resin and 5g of chain extender, and the thickness of the modified layer is 400μm.

[0072] The filler layer comprises a carbon fiber mesh with a mesh pore size of 0.8 mm.

[0073] The chain extender is 2.5 g of dimethylthiotoluenediamine and 2.5 g of N,N-dialkylmethyldiamine.

[0074] The preparation method of the elastomer layer is as follows: dehydrating polytetramethyleneimine polyol under reduced pressure at 105° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 22° C. for 0.6 h, heating to 75° C. for reaction for 2.5 h, cooling, and discharging;

[0075] The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 32° C. for 1.5 hours under nitrogen protection.

[0076] The composite layer is coated on both sides of the substrate layer, and the composite layer includes 5 elastomer layers, 5 modified layers and 10 filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0077] The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0078] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, the spraying conditions are 83° C., 17 MPa, and dry;

[0079] Then the elastomer layer is sprayed on the surface of the filler layer at 75°C, 13MPa, and dried; then the filler layer is sprayed on the surface of the elastomer layer at 83°C, 17MPa, and dried;

[0080] Finally, the modified layer is sprayed on the surface of the filler layer at 65° C. and 11 MPa, followed by drying and curing. The above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0081] Example 4

[0082] An explosion-proof and bullet-proof coating material comprises a substrate layer and a composite layer.

[0083] The substrate layer is an aluminum plate, and the thickness of the aluminum plate is 7.6 mm;

[0084] The elastomer layer comprises: 30g toluene diisocyanate, 37g polytetramethylene glycol, and 44g 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2500 g / mol; and the thickness of the elastomer layer is 9mm.

[0085] The modified layer includes: 20g of epoxy resin and 5g of chain extender, and the thickness of the modified layer is 200μm.

[0086] The filler layer comprises a carbon fiber mesh with a mesh pore size of 0.5 mm.

[0087] The chain extender is 2.5 g of dimethylthiotoluenediamine and 2.5 g of N,N-dialkylmethyldiamine.

[0088] The preparation method of the elastomer layer is as follows: dehydrating polytetramethylene glycol under reduced pressure at 110° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 25° C. for 1 hour, heating to 80° C. for reaction for 2 hours, cooling, and discharging;

[0089] The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 35° C. for 1 hour under nitrogen protection.

[0090] The composite layer is coated on both sides of the substrate layer, and the composite layer includes 5 elastomer layers, 5 modified layers and 10 filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0091] The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0092] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, the spraying conditions are 83° C., 17 MPa, and dry;

[0093] Then the elastomer layer is sprayed on the surface of the filler layer at 75°C, 13MPa, and dried; then the filler layer is sprayed on the surface of the elastomer layer at 83°C, 17MPa, and dried;

[0094] Finally, the modified layer is sprayed on the surface of the filler layer at 65° C. and 11 MPa, followed by drying and curing. The above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0095] Example 5

[0096] An explosion-proof and bullet-proof coating material comprises a substrate layer and a composite layer.

[0097] The substrate layer is an aluminum plate; the thickness of the aluminum plate is 6.1 mm;

[0098] The elastomer layer comprises: 20g toluene diisocyanate, 32g polytetramethylene glycol, and 36g 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2000 g / mol; and the thickness of the elastomer layer is 5mm.

[0099] The modified layer includes: 16g of epoxy resin and 3g of chain extender, and the thickness of the modified layer is 300μm.

[0100] The filler layer comprises a carbon fiber mesh with a mesh pore size of 1 mm.

[0101] The chain extender is diethyltoluenediamine.

[0102] The preparation method of the elastomer layer is as follows: dehydrating polytetramethyleneimine polyol under reduced pressure at 110° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 25° C. for 0.5 h, heating to 80° C. for reaction for 2 h, cooling, and discharging;

[0103] The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 35° C. for 1 hour under nitrogen protection.

[0104] The composite layer is coated on both sides of the substrate layer, and the composite layer includes 6 elastomer layers, 6 modified layers and 12 filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer";

[0105] The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps:

[0106] Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, the spraying conditions are 85° C., 18 MPa, and dry;

[0107] Then the elastomer layer is sprayed on the surface of the filler layer at 80°C, 15MPa, and dried; then the filler layer is sprayed on the surface of the elastomer layer at 85°C, 18MPa, and dried;

[0108] Finally, the modified layer is sprayed on the surface of the filler layer at 70° C. and 12 MPa, followed by drying and curing. The above operations are repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material.

[0109] Comparative Example 1

[0110] An explosion-proof and bullet-proof coating material, which differs from Example 1 in that the composite layer is arranged alternately in the order of "modified layer-filler layer-elastomer layer-filler layer".

[0111] Comparative Example 2

[0112] An explosion-proof and bullet-proof coating material, which differs from Example 2 in that no filler layer is provided.

[0113] Comparative Example 3

[0114] An explosion-proof and bullet-proof coating material, which differs from Example 3 in that no composite layer is provided, and the composite layer is replaced by a polyurea resin layer of the same thickness.

[0115] Comparative Example 4

[0116] An explosion-proof and bullet-proof coating material, which differs from Example 4 in that the composite layers are arranged alternately in the order of "elastomer layer-filler layer-modified layer-filler layer".

[0117] Comparative Example 5

[0118] An explosion-proof and bullet-proof coating material, which differs from Example 5 in that the substrate is an explosion-proof glass substrate with a thickness of 8 mm.

[0119] Comparative Example 6

[0120] An explosion-proof and bullet-proof coating material, which is different from Example 1 in that the coating material is prepared with reference to the patent publication number CN113717620A.

[0121] All the above coating materials were tested for performance according to the standard of GB9278, and the test results are shown in Table 1. In addition, all coating materials were prepared into 3 mm thick coatings, and 1.5 kg TNT explosives were used to blast and impact to detect the damage of the coatings.

[0122] Table 1 Mechanical strength test of coating materials

[0123]

[0124] Table 2 Explosion-proof performance test of coating materials

[0125]

[0126] As can be seen from Table 1 and Table 2, when Example 1 is compared with Comparative Example 1, it can be seen that when the composite layer is only a single layer, its explosion-proof performance is significantly worse than that of a multi-layer structure, while the tensile strength and tear strength are slightly reduced. The reason may be that the multi-layer composite structure promotes the combination of polyurea and carbon fiber mesh, thereby better improving the tear strength and tensile strength of the coating material.

[0127] Comparing Example 2 with Comparative Example 2, it can be seen that without adding the carbon fiber mesh, the synthesized polyurea cannot obtain an interpenetrating structure in the multi-layer coating, and the tensile strength, tear strength and explosion-proof strength of the coating material are significantly reduced.

[0128] Comparison between Example 3 and Comparative Example 3 shows that the effect of spraying a simple polyester material as a structural layer is not as good as that of Example 3 which utilizes the effects and polarities between the various functional layers to improve the adhesion between the coating materials.

[0129] Comparison between Example 4 and Comparative Example 4 shows that after disrupting the spraying order between the functional layers, the reaction order and polarity of the functional layers will change due to different components, such as epoxy resin, chain extender and isocyanate, polytetramethylene glycol and 3,5-diethyltoluenediamine, thereby affecting the bonding strength, and the tear strength of the final coating material will also decrease to a certain extent.

[0130] Comparison between Example 1 and Comparative Example 5 shows that the substrate of the coating material has a certain influence on the final explosion-proof effect and tear strength of the explosion-proof and bulletproof coating material. The reason may be that the impact resistance of the explosion-proof glass is not as good as that of the steel plate. When the substrate is broken, the polyurea coating on the impact surface cannot effectively improve the energy absorption characteristics of the high-strength substrate; and comparison between Example 1 and Comparative Example 6 shows that compared with the existing explosion-proof and bulletproof coating materials, the method of the present invention does not require cumbersome conditions such as large reactors and high-speed rotors, while the final tensile strength, tear strength and explosion resistance are roughly equivalent to them.

[0131] In summary, the present invention provides an explosion-proof and bullet-proof coating material and a preparation method thereof, which adopts a multilayer arrangement of "modified layer-filler layer-elastomer layer-filler layer", and rationally utilizes the effects and polarities between the various functional layers, combines the characteristics of the polyurea material, and forms an interpenetrating structure with fillers such as carbon fiber mesh, while having good flexibility, it can still maintain substantially equivalent substrate adhesion, tensile strength, tear strength and explosion resistance to the explosion-proof coating materials on the market.

[0132] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an explosion-proof and bullet-proof coating material, characterized in that: Including substrate layer and composite layer, Wherein, the composite layer is coated on both sides of the substrate layer, and the composite layer includes a plurality of elastomer layers, a plurality of modified layers and a plurality of filler layers, and is arranged alternately in the order of "modified layer-filler layer-elastic layer-filler layer"; The method for preparing the explosion-proof and bullet-proof coating material comprises the following steps: Prepare a modified layer and an elastomer layer, spray the filler layer on the surface of the substrate layer, and dry; Then spraying the elastomer layer on the surface of the filler layer and drying; then spraying the filler layer on the surface of the elastomer layer and drying; Finally, the modified layer is sprayed on the surface of the filler layer, dried, and cured, and the above operation is repeated on the other side of the substrate layer to obtain the explosion-proof and bullet-proof coating material; The elastomer layer comprises the following raw materials: diisocyanate, polytetramethylene glycol and 3,5-diethyltoluenediamine; The modified layer comprises the following raw materials: epoxy resin and chain extender; The filler layer includes a carbon fiber mesh; The preparation method of the elastomer layer is as follows: dehydrating polytetramethylene glycol under reduced pressure at 100-110° C., evacuating, and protecting under nitrogen, and then reacting with diisocyanate and 3,5-diethyltoluenediamine at 20-25° C. for 0.5-1 h, heating to 70-80° C. for reaction for 2-3 h, cooling, and discharging; The preparation method of the modified layer is as follows: the epoxy resin and the chain extender are uniformly stirred, and reacted at 30-35° C. for 1-2 hours under nitrogen protection.

2. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The elastomer layer comprises the following materials in parts by weight: 20-40 parts of diisocyanate, 32-47 parts of polytetramethylene glycol, and 36-54 parts of 3,5-diethyltoluenediamine; the molecular weight of the polytetramethylene glycol is 2000-3000 g / mol; The modified layer comprises the following materials in parts by weight: 16-30 parts of epoxy resin and 3-7 parts of chain extender.

3. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The composite layer is in the order of "modified layer-filler layer-elastomer layer-filler layer" alternating 5 times.

4. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The substrate layer is a steel plate or an aluminum plate.

5. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The mesh pores of the carbon fiber mesh are 0.5-1 mm.

6. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The spraying conditions of the modified layer are 60-70° C. and 10-12 MPa.

7. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The spraying conditions of the elastomer layer are 70-80° C. and 12-15 MPa.

8. The method for preparing the explosion-proof and bullet-proof coating material according to claim 1, characterized in that: The spraying conditions of the filler layer are 80-85° C. and 16-18 MPa.

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