A kind of explosion-proof polyurea material with damping and energy absorption and preparation method thereof

Abstract

The present invention discloses an explosion-proof polyurea material with damping and energy absorption and a preparation method thereof. The explosion-proof polyurea material comprises two groups, A and B. Component A consists of 28 to 49 parts of diisocyanate, 45 to 72 parts of terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane; Component B consists of 10 to 36 parts of terminal amino polydimethylsiloxane, 60 to 82 parts of secondary amine chain extender containing diselenide bond, 0.2 to 0.5 parts of catalyst, 3 to 8 parts of dewatering agent, and 3 to 8 parts of color paste. A secondary amine chain extender containing diselenide bond is synthesized by Michael addition reaction, and a damping and energy absorption explosion-proof polyurea material is prepared with the synthesized secondary amine chain extender and diisocyanate as hard segments and polysiloxane as soft segments. The material can be widely used in petrochemical storage and transportation, military protection and other fields, and has the characteristics of high construction efficiency, high damping coefficient, high elongation, explosion-proof and energy absorption.

Description

Technical Field

[0001] The invention relates to the technical field of polyurea materials, in particular to a damping and energy-absorbing explosion-proof polyurea material and a preparation method thereof. Background Art

[0002] Explosion is a phenomenon in which a large amount of energy is released or converted rapidly in a limited volume and in a very short time. This energy conversion has a strong effect on the surrounding medium through the explosion shock wave. As the main source of damage, the explosion shock wave reaches the surface of the protective structure after a very short time of propagation. The stress wave is 10 3 m / s speed propagates in the structure, completing serious damage to the structure and the personnel and equipment inside within milliseconds. Filling energy-absorbing and buffering materials in the concrete or metal structure interlayer or surface can effectively improve the protection effect of the structure. Commonly used energy-absorbing and buffering materials include porous foam materials, high-performance fiber materials, etc.

[0003] Spray polyurea elastomer (SPUA for short) is developed on the basis of polyurethane technology. It is a solvent-free, pollution-free, environmentally friendly and safe material. Spray polyurea elastomer has the characteristics of rapid curing, high tensile strength, high wear resistance and high construction efficiency. It is widely used in building waterproofing, mine wear resistance, military protection and other fields. Studies have found that polyurea materials have obvious strain rate effects. Polyurea materials in the glass transition zone have good damping properties. Under stress, the internal molecular chain segments need to overcome the internal friction resistance to do work, convert the vibration mechanical energy into heat energy and dissipate it quickly, thereby achieving the effect of slowing down the impact of the explosion.

[0004] Diselenide bond is a new type of dynamic covalent bond with a bond energy of 172 kJ / mol -1 Under stress, the diselenide bond converts mechanical energy into heat energy and dissipates it in the process of reversible exchange reaction and bond breaking, so as to achieve the effect of energy absorption and impact mitigation. The side-group hanging chain of the secondary amine chain extender can reduce the microphase separation degree between the soft segment structure and the hard segment structure of the polyurea material on the one hand, and improve the internal friction resistance of the polyurea material on the other hand, and enhance the energy absorption and buffering capacity of the polyurea material through the synergistic effect of the two aspects.

[0005] The molecular structure of polysiloxane resin contains -Si-O-Si- bonds, and the bond energy of Si-O bonds reaches 422.5 kJ / mol -1 , with both "organic / inorganic" properties. The Si-CH3 structure on the side chain of linear polysiloxane is symmetrical, with a large number of substituents, and the energy absorption effect is obvious during the movement of the chain segments and molecular chains; the glass transition temperature of linear polysiloxane resin is as low as -123°C. Compared with polyethylene oxide polyol and polyester polyol, polysiloxane resin can respond to higher frequency explosion shock waves.

[0006] Therefore, the purpose of the present invention is to prepare an explosion-proof polyurea material with damping and energy absorption function, which is composed of a secondary amine chain extender containing a diselenide bond and a polysiloxane soft segment. Summary of the invention

[0007] In order to meet the explosion-proof energy absorption performance requirements of polyurea elastomers, a secondary amine chain extender containing a diselenide bond was first synthesized through the Michael addition reaction, and a damping energy-absorbing explosion-proof polyurea material was prepared with the synthesized secondary amine chain extender and diisocyanate as hard segments and polysiloxane as soft segments. This material can be widely used in petrochemical storage and transportation, military protection and other fields, and has the characteristics of high construction efficiency, high damping coefficient, high elongation, explosion-proof energy absorption, etc.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A damping and energy-absorbing explosion-proof polyurea material, comprising two components A and B:

[0010] Component A is composed of 28 to 49 parts of diisocyanate and 45 to 72 parts of terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane;

[0011] Component B is composed of 10 to 36 parts of amino-terminated polydimethylsiloxane, 60 to 82 parts of secondary amine chain extender containing diselenide bond, 0.2 to 0.5 parts of catalyst, 3 to 8 parts of water remover and 3 to 8 parts of color paste.

[0012] As a further embodiment of the present invention, the structural formula of the secondary amine chain extender containing a diselenide bond is as follows:

[0013]

[0014] As a further embodiment of the present invention, the synthesis method of the secondary amine chain extender containing a diselenide bond is:

[0015] The iodoaniline is heated to 65°C to 70°C in an oven and completely melted, and then added to a reaction bottle, dimethyl sulfoxide solvent is added, nitrogen is introduced, and the temperature is raised to 90°C, and selenium powder is added, and the reaction is carried out in the dark for 12 hours to obtain a solution containing diaminodiphenyl diselenide; the solution is allowed to stand and cool, and after diaminodiphenyl diselenide and iodine are precipitated, a solid is obtained by suction filtration; diaminodiphenyl diselenide is extracted with chloroform and suction filtration is performed to obtain diaminodiphenyl diselenide;

[0016] Dissolve diaminodiphenyl diselenide in tetrahydrofuran solution, introduce nitrogen and heat to 60-80°C, add diethyl maleate dropwise, and after the addition is completed, control the reaction temperature to 80-90°C and react for 24 hours to obtain a solution containing a reaction product; reduce the temperature to 40-50°C and maintain a negative pressure of 0.1-0.2MPa to detetrahydrofuran for 1.5-2 hours to obtain a secondary amine chain extender containing a diselenide bond.

[0017] As a further embodiment of the present invention, the iodoaniline is 4-iodoaniline.

[0018] As a further embodiment of the present invention, the molar ratio of iodoaniline to selenium powder in the diaminodiphenyl diselenide synthesis reaction is 1:1.

[0019] As a further embodiment of the present invention, the molar ratio of diaminodiphenyl diselenide to diethyl maleate in the synthesis reaction of the secondary amine chain extender containing a diselenide bond is 1:2.0 to 1:2.02.

[0020] As a further embodiment of the present invention, the preparation method of component A is as follows:

[0021] Add diisocyanate into a four-necked flask and heat it to 50-60°C; add terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane while stirring. After the addition is complete, heat it to 85-95°C and keep it warm for 1.5-2.5 hours. When the titration value of the NCO content reaches the theoretical value, stop heating, cool it to room temperature, and then discharge it for use to obtain the required A component prepolymer.

[0022] As a further solution of the present invention, the NCO content of the prepolymer of component A is 8% to 16%, and the solid content is ≥99%.

[0023] As a further embodiment of the present invention, the diisocyanate is one or a mixture of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), 1,6-hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), xylylene diisocyanate (XDI), trimethylhexamethylene diisocyanate (TMDI), methylcyclohexyl diisocyanate (HTDI), dicyclohexylmethane diisocyanate (HMDI), and tetramethylxylylene diisocyanate (TMXDI).

[0024] As a further embodiment of the present invention, the terminal hydroxyalkyl polysiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

[0025]

[0026] As a further embodiment of the present invention, the terminal hydroxyl polydimethylsiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

[0027]

[0028] As a further embodiment of the present invention, the preparation method of component B is as follows:

[0029] Add amino-terminated polydimethylsiloxane, secondary amine chain extender containing diselenide bonds, catalyst, dehydrating agent and color paste into the dispersion container in sequence, maintain the stirring speed for 20min to 40min, then stop stirring to obtain the required component B.

[0030] As a further embodiment of the present invention, the amino-terminated polydimethylsiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

[0031]

[0032] As a further embodiment of the present invention, the catalyst is a mixture of one or more of a tertiary amine catalyst and an organic metal compound catalyst.

[0033] As a further embodiment of the present invention, the tertiary amine catalyst includes N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N',N'-tetramethylalkylenediamine, triethylamine, N,N-dimethylbenzylamine, N-ethylmorpholine, N,N'-diethylpiperazine, triethanolamine, N,N'-dimethylethanolamine, and N,N'-lutidine.

[0034] As a further embodiment of the present invention, the organometallic compound catalyst includes dibutyltin dilaurate, stannous octoate, lead isooctanoate, zinc isooctanoate, bismuth isooctanoate, tetrabutyl titanate, and tetraisopropyl titanate.

[0035] As a further solution of the present invention, the dehydrating agent is a molecular sieve with a specification of 3A or 4A.

[0036] As a further solution of the present invention, the color paste is a universal polyurethane color paste.

[0037] A method for preparing a damping and energy-absorbing explosion-proof polyurea material, comprising the following steps:

[0038] 1) preparing diaminodiphenyl diselenide by substitution reaction between iodoaniline and selenium powder, and preparing a secondary amine chain extender containing a diselenide bond by Michael addition reaction between diaminodiphenyl diselenide and maleate;

[0039] 2) Component A is a prepolymer synthesized by reacting diisocyanate with terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane, and component B is composed of terminal amino polydimethylsiloxane, a secondary amine chain extender containing a diselenide bond, a catalyst, a water scavenger and a color paste;

[0040] 3) Component A and component B are mixed in a volume ratio of 1:1 and sprayed using a spraying device to prepare a damping and energy-absorbing explosion-proof polyurea material.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The invention discloses an explosion-proof polyurea material with damping and energy absorption and a preparation method thereof. A secondary amine chain extender containing a diselenide bond is synthesized by Michael addition reaction, and the synthesized secondary amine chain extender and diisocyanate are used as hard segments, and polysiloxane is used as soft segments to prepare an explosion-proof polyurea material with damping and energy absorption. The material can be widely used in the fields of petrochemical storage and transportation, military protection, etc., and has the characteristics of high construction efficiency, high damping coefficient, high elongation, explosion-proof and energy absorption, etc. DETAILED DESCRIPTION

[0043] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0044] In order to meet the explosion-proof energy absorption performance requirements of polyurea elastomers, the purpose of the present invention is to prepare an explosion-proof polyurea material with damping energy absorption function, which is composed of a secondary amine chain extender containing a diselenide bond and a polysiloxane soft segment.

[0045] In an embodiment of the present invention, a damping and energy-absorbing explosion-proof polyurea material and a preparation method thereof provided by the present invention are composed of two components A and B, wherein the A component is composed of a prepolymer synthesized by the reaction of diisocyanate and terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane, and the B component is composed of terminal amino polydimethylsiloxane, a secondary amine chain extender containing a diselenide bond, a catalyst, a water scavenger and a color paste. During the preparation, the secondary amine chain extender containing a diselenide bond is first synthesized: diaminodiphenyl diselenide is prepared by a substitution reaction of iodoaniline and selenium powder, and diaminodiphenyl diselenide and maleate are reacted by Michael addition to prepare a secondary amine chain extender containing a diselenide bond; then component A and component B are prepared, and component A and component B are sprayed in a volume ratio of 1:1 using a spraying device to prepare the damping and energy-absorbing explosion-proof polyurea material.

[0046] Among them, the synthesis of secondary amine chain extender containing diselenide bond:

[0047] Heat 547.5 parts of 4-iodoaniline in an oven to 65°C to 70°C and completely melt it, then add it to a reaction bottle, add dimethyl sulfoxide solvent, introduce nitrogen and heat it to 90°C, add 197.5 parts of selenium powder, and react in the dark for 12 hours to obtain a solution containing 4,4'-diaminodiphenyl diselenide. Let the solution stand and cool, and after 4,4'-diaminodiphenyl diselenide and iodine precipitate, filter to obtain a solid. Extract with chloroform three times and filter to obtain 4,4'-diaminodiphenyl diselenide.

[0048] Dissolve 344 parts of 4,4'-diaminodiphenyl diselenide in tetrahydrofuran solution, introduce nitrogen and heat to 60℃~80℃, add 350 parts of diethyl maleate dropwise, and after the addition is completed, control the reaction temperature to 80℃~90℃ and react for 24h to obtain a solution containing the reaction product. The temperature is lowered to 40℃~50℃, and the pressure is maintained at 0.1MPa~0.2MPa under negative pressure to remove tetrahydrofuran for 2h~2.5h to obtain a secondary amine chain extender containing a diselenide bond.

[0049] Some embodiments of the present application will be described in detail below. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0050] Example 1

[0051] A damping and energy-absorbing explosion-proof polyurea material comprises two components, A and B, wherein:

[0052] (1) Preparation of component A

[0053] Add 323 parts of toluene diisocyanate (TDI) into a four-necked flask, turn on heating and stirring, and raise the temperature to 50℃~60℃. Slowly drop 677 parts of hydroxy-terminated polydimethylsiloxane with a molecular weight of 1000 into the four-necked flask. After the dropwise addition is completed, control the reaction temperature to 85℃~95℃ and react for 1.5h-2.0h. After sampling and measuring the NCO content to reach 9.9%±0.3%, it can be cooled to room temperature and discharged to obtain the desired A component prepolymer.

[0054] (2) Preparation of component B

[0055] Add 657 parts of secondary amine chain extender containing diselenide bond and 238 parts of amino-terminated polydimethylsiloxane with molecular weight of 2000 into the stirring tank, stir for 3-5 minutes until evenly dispersed, then add 50 parts of color paste, 50 parts of 3A molecular sieve and 5 parts of N,N-dimethylbenzylamine into the stirring tank in turn, disperse for 30-40 minutes, and then filter with a 120-mesh filter to obtain the required B component.

[0056] (3) The prepared component A prepolymer and component B are sprayed at a volume ratio of 1:1 using a spraying device to prepare a damping and energy-absorbing explosion-proof polyurea material.

[0057] Example 2

[0058] A damping and energy-absorbing explosion-proof polyurea material comprises two components, A and B, wherein:

[0059] (1) Preparation of component A

[0060] Add 435 parts of diphenylmethane diisocyanate (MDI) into a four-necked flask, turn on heating and stirring, and raise the temperature to 50℃~60℃. Slowly drop 565 parts of hydroxy-terminated polydimethylsiloxane with a molecular weight of 2000 into the four-necked flask. After the dropwise addition is completed, control the reaction temperature to 80℃~90℃ and react for 1.5h-2.0h. After sampling and measuring the NCO content to reach 12.2%±0.3%, it can be cooled to room temperature and discharged to obtain the desired A component prepolymer.

[0061] (2) Preparation of component B

[0062] Add 786 parts of secondary amine chain extender containing diselenide bonds and 109 parts of amino-terminated polydimethylsiloxane with a molecular weight of 1000 into a stirring tank and stir for 3-5 minutes until uniformly dispersed. Add 50 parts of color paste, 50 parts of 4A molecular sieve and 5 parts of zinc isooctanoate into the stirring tank in turn. Disperse for 30-40 minutes and filter with a 120-mesh filter to obtain the required component B.

[0063] (3) The prepared component A prepolymer and component B are sprayed at a volume ratio of 1:1 using a spraying device to prepare a damping and energy-absorbing explosion-proof polyurea material.

[0064] Example 3

[0065] A damping and energy-absorbing explosion-proof polyurea material comprises two components, A and B, wherein:

[0066] (1) Preparation of component A

[0067] Add 481 parts of diphenylmethane diisocyanate (MDI) into a four-necked flask, turn on heating and stirring, and raise the temperature to 50°C to 60°C. Slowly drop 519 parts of terminal hydroxyalkyl polysiloxane with a molecular weight of 1000 into the four-necked flask. After the dropwise addition is completed, control the reaction temperature to 80°C to 90°C for 1.5h-2.0h. After sampling and measuring the NCO content to reach 11.8%±0.3%, it can be cooled to room temperature and discharged to obtain the desired A component prepolymer.

[0068] (2) Preparation of component B

[0069] Add 753 parts of secondary amine chain extender containing diselenide bonds and 142 parts of amino-terminated polydimethylsiloxane with a molecular weight of 1000 into a stirring tank and stir for 3-5 minutes until uniformly dispersed. Add 50 parts of color paste, 50 parts of 4A molecular sieve and 5 parts of N,N-dimethylcyclohexylamine into the stirring tank in turn. Disperse for 30-40 minutes and filter with a 120-mesh filter to obtain the required component B.

[0070] (3) The prepared component A prepolymer and component B are sprayed at a volume ratio of 1:1 using a spraying device to prepare a damping and energy-absorbing explosion-proof polyurea material.

[0071] Example 4

[0072] A damping and energy-absorbing explosion-proof polyurea material comprises two components, A and B, wherein:

[0073] (1) Preparation of component A

[0074] Add 306 parts of toluene diisocyanate (TDI) into a four-necked flask, turn on heating and stirring, and raise the temperature to 50℃~60℃. Slowly drop 694 parts of terminal hydroxyalkyl polysiloxane with a molecular weight of 2000 into the four-necked flask. After the dropwise addition is completed, control the reaction temperature to 80℃~90℃ and react for 1.5h-2.0h. After sampling and measuring the NCO content to reach 11.9%±0.3%, it can be cooled to room temperature and discharged to obtain the desired A component prepolymer.

[0075] (2) Preparation of component B

[0076] Add 714 parts of secondary amine chain extender containing diselenide bonds and 181 parts of amino-terminated polydimethylsiloxane with a molecular weight of 1000 into a stirring tank and stir for 3-5 minutes until uniformly dispersed. Add 50 parts of color paste, 50 parts of 3A molecular sieve and 5 parts of N-ethylmorpholine into the stirring tank in turn. Disperse for 30-40 minutes and filter with a 120-mesh filter to obtain the required component B.

[0077] (3) The prepared component A prepolymer and component B are sprayed in a volume ratio of 1:1 using a spraying device to prepare a damping energy-absorbing explosion-proof polyurea material

[0078] The main performance indicators of the damping energy-absorbing explosion-proof polyurea materials prepared in Examples 1-4 of the present invention are shown in Table 1:

[0079] Table 1 Main performance indicators of the damping energy-absorbing explosion-proof polyurea materials prepared in Examples 1-4

[0080] Serial number Test items Example 1 Example 2 Example 3 Example 4 1 Solid content, % 99.6 99.5 99.5 99.7 2 Tensile strength, MPa 11.5 13.9 14.2 13.6 3 Elongation at break, % 734 685 651 769 4 <![CDATA[tanδ max ]]> 1.03 0.86 0.91 1.06

[0081] The damping and energy-absorbing explosion-proof polyurea material of Example 4 of the present invention was sent to a third party, the State Key Laboratory of Explosion Science and Technology of Beijing Institute of Technology, for polyurea explosion-proof performance testing. The test report is as follows:

[0082] 1. Test name and conditions

[0083] Test specimen name: Polyurea sprayed reinforced concrete slab;

[0084] Number of samples: 4;

[0085] Reference standard: GJB 6390.1-2008;

[0086] Testing equipment: visual observation, camera;

[0087] Test conditions: normal temperature, outdoors;

[0088] Test type: Explosion shock test.

[0089] 2. Test Method

[0090] 1. Test model: 2 concrete slabs of 1.5mX1.5mX0.3m (1 with and 1 without polyurea, 10mm sprayed on both sides of polyurea), 2 concrete slabs of 1.0mX1.0mX0.3m (1 with and 1 without polyurea, 5mm sprayed on one side of polyurea), 2 10kg TNT charges, and 2 1.4kg TNT charges.

[0091] 2. Measure physical quantities: failure mode of the test target plate.

[0092] 3. Test content: Compare the changes in concrete slab failure mode with and without polyurea covering layer.

[0093] 3. Test steps

[0094] 1. Debug and verify the effectiveness of the test system and the effect target plate test system;

[0095] 2. Place a 10kg TNT column on top of a 1.5mX1.5mX0.3m concrete slab;

[0096] 3. Confirm that the test and detonation system are correct, detonate the first test after the site is safe, and test the explosion process and the target plate destruction mode after the explosion;

[0097] 4. Place 10kg TNT charge on the 1.5mX1.5mX0.3m concrete slab coated with polyurea (10mm sprayed on both sides);

[0098] 5. Confirm that the test and detonation system are correct, detonate the second test after the site is safe, and test the explosion process and the target plate destruction mode after the explosion;

[0099] 6. Place a 1.4kg TNT column on top of a 1.0mX1.0mX0.3m concrete slab;

[0100] 7. Confirm that the test and detonation system are correct, detonate the third test after the site is safe, and test the explosion process and the target plate destruction mode after the explosion;

[0101] 8. Place 1.4kg TNT column in contact with the 1.0mX1.0mX0.3m concrete slab coated with polyurea (5mm sprayed on the back);

[0102] 9. Confirm that the test and detonation systems are correct, detonate the 4th test after the site is safe, and test the explosion process and the target plate destruction mode after the explosion.

[0103] 4. Test results

[0104] When the 10mm coating withstands the impact of 10kgTNT explosion, the 300mmC40 concrete target plate coated on both sides is damaged but does not collapse as a whole, and the secondary fragmentation protection rate is not less than 80%; when the 5mm sprayed 300mm reinforced concrete is exposed to 1.4kgTNT explosion, the back of the concrete plate does not collapse.

[0105] The explosion-proof polyurea material with damping and energy absorption of the present invention can be widely used in the fields of petrochemical storage and transportation, military protection, etc., and has the characteristics of high construction efficiency, high damping coefficient, high elongation, explosion-proof and energy absorption.

[0106] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A damping and energy-absorbing explosion-proof polyurea material, characterized in that: Contains two groups, A and B: Component A is composed of 28 to 49 parts of diisocyanate and 45 to 72 parts of terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane; Component B is composed of 10 to 36 parts of amino-terminated polydimethylsiloxane, 60 to 82 parts of secondary amine chain extender containing diselenide bonds, 0.2 to 0.5 parts of catalyst, 3 to 8 parts of dewatering agent, and 3 to 8 parts of color paste; Wherein, the structural formula of the secondary amine chain extender containing a diselenide bond is as follows: Wherein, the synthesis method of the secondary amine chain extender containing diselenide bonds is: The iodoaniline is heated to 65°C to 70°C in an oven and completely melted, and then added to a reaction bottle, dimethyl sulfoxide solvent is added, nitrogen is introduced, and the temperature is raised to 90°C, and selenium powder is added, and the reaction is carried out in the dark for 12 hours to obtain a solution containing diaminodiphenyl diselenide; the solution is allowed to stand and cool, and after diaminodiphenyl diselenide and iodine are precipitated, a solid is obtained by suction filtration; diaminodiphenyl diselenide is extracted with chloroform and suction filtration is performed to obtain diaminodiphenyl diselenide; Dissolve diaminodiphenyl diselenide in tetrahydrofuran solution, introduce nitrogen and raise the temperature to 60-80°C, add diethyl maleate dropwise, and after the addition is completed, control the reaction temperature to 80-90°C and react for 24 hours to obtain a solution containing the reaction product; reduce the temperature to 40-50°C and maintain the pressure at 0.1 MPa to remove tetrahydrofuran under negative pressure for 1.5-2 hours to obtain a secondary amine chain extender containing a diselenide bond.

2. The explosion-proof polyurea material with damping and energy absorption according to claim 1, characterized in that: The iodoaniline is 4-iodoaniline; and the molar ratio of iodoaniline to selenium powder in the synthesis reaction of diaminodiphenyl diselenide is 1:

1.

3. The explosion-proof polyurea material with damping and energy absorption according to claim 2, characterized in that: In the synthesis reaction of the secondary amine chain extender containing diselenide bonds, the molar ratio of diaminodiphenyl diselenide to diethyl maleate is 1:2.0 to 1:2.

02.

4. The explosion-proof polyurea material with damping and energy absorption according to claim 1, characterized in that: The preparation method of the A component is: Add diisocyanate into a four-necked flask and heat it to 50-60°C; add terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane while stirring. After the addition is complete, heat it to 85-95°C and keep it warm for 1.5-2.5 hours. When the titration value of the NCO content reaches the theoretical value, stop heating, cool it to room temperature, and then discharge it for use to obtain the required A component prepolymer.

5. The explosion-proof polyurea material with damping and energy absorption according to claim 4, characterized in that: The A component prepolymer has an NCO content of 8% to 16% and a solid content of ≥99%.

6. The explosion-proof polyurea material with damping and energy absorption according to claim 4, characterized in that: The terminal hydroxyalkyl polysiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

7. The explosion-proof polyurea material with damping and energy absorption according to claim 4, characterized in that: The terminal hydroxyl polydimethylsiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

8. The explosion-proof polyurea material with damping and energy absorption according to claim 1, characterized in that: The preparation method of the B component is: Add amino-terminated polydimethylsiloxane, secondary amine chain extender containing diselenide bonds, catalyst, dehydrating agent and color paste into the dispersion container in sequence, maintain the stirring speed for 20min to 40min, then stop stirring to obtain the required component B.

9. The explosion-proof polyurea material with damping and energy absorption according to claim 8, characterized in that: The amino-terminated polydimethylsiloxane has a functionality of 2.0, a molecular weight of 1000 to 2000, and a structural formula of:

10. The explosion-proof polyurea material with damping and energy absorption according to claim 8, characterized in that: The catalyst is a mixture of one or more of a tertiary amine catalyst and an organic metal compound catalyst.

11. A method for preparing the damping and energy-absorbing explosion-proof polyurea material according to any one of claims 1 to 10, characterized in that: The steps of the preparation method are as follows; 1) preparing diaminodiphenyl diselenide by substitution reaction between iodoaniline and selenium powder, and preparing a secondary amine chain extender containing a diselenide bond by Michael addition reaction between diaminodiphenyl diselenide and maleate; 2) Component A is a prepolymer synthesized by reacting diisocyanate with terminal hydroxyalkyl polysiloxane or terminal hydroxyl polydimethylsiloxane, and component B is composed of terminal amino polydimethylsiloxane, a secondary amine chain extender containing a diselenide bond, a catalyst, a water scavenger and a color paste; 3) Component A and component B are mixed in a volume ratio of 1:1 and sprayed using a spraying device to prepare a damping and energy-absorbing explosion-proof polyurea material.

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