High-strength tungsten-boron silicone rubber radiation shielding material and preparation method thereof

Abstract

The invention discloses a high-strength tungsten-boron silicone rubber radiation shielding material, which is prepared from the following ingredients in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30 to 50 parts of white carbon black, 90 to 240 parts of tungsten oxide coated boron carbide heterostructure particles, 4 to 10 parts of hydroxyl silicone oil and 1 to 2.5 parts of 2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane. The preparation method comprises the following steps: 1, surface modification of tungsten oxide particles; 2, boron carbide surface modification; 3, grafting the surfaces of the two; and 4, mixing and vulcanizing the raw materials. White carbon black and tungsten oxide coated boron carbide heterostructure particles are introduced into the material, so that the dispersity of tungsten oxide particles in a silicon rubber matrix is improved, the interface interaction between boron carbide and the silicon rubber matrix is enhanced, the high strength of the material is ensured, and the material has excellent mechanical strength and neutron / gamma ray comprehensive shielding performance; the method is easy for mass production and can be used in the field of radiation protection.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear materials, and in particular relates to a high-strength tungsten borosilicate rubber radiation shielding material and a preparation method thereof. Background Art

[0002] The rapid development of the nuclear energy industry has led to an increasing demand for spent fuel tanks, nuclear pipelines and other equipment and facilities. In order to reduce the damage to the environment and personnel caused by radiation generated during the storage and transportation of spent fuel and the operation of nuclear equipment and instruments, flexible rubber materials for personal radiation protection and peripheral radiation protection of nuclear facilities, nuclear equipment, nuclear instruments, etc. are essential. In addition, flexible rubber radiation protection materials used in the above-mentioned environments often need to withstand dual radiation from neutrons and gamma rays, so the rubber materials must also have good neutron / gamma ray integrated shielding performance.

[0003] Generally, materials such as boron carbide, gadolinium, lead, and tungsten are added to the rubber matrix to give it neutron and gamma-ray shielding properties. However, there are a large number of inorganic-organic interfaces between shielding fillers such as boron carbide and the rubber matrix, which leads to serious agglomeration of the filler in the matrix. At the same time, there are obvious gaps between the filler and the matrix, which in turn affects the effect of the filler on improving the shielding performance of the matrix. In addition, a high content of shielding fillers is often required to give silicone rubber materials effective radiation shielding properties, which will greatly damage the mechanical properties of silicone rubber materials and affect their practical applications.

[0004] Therefore, it is urgent to develop a silicone rubber radiation shielding material that is green, environmentally friendly, simple and efficient to prepare, and has excellent mechanical properties and neutron / gamma ray comprehensive shielding performance. Currently, there are few systematic reports on the methods and process routes of high-strength tungsten borosilicate rubber radiation shielding materials. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-strength tungsten boron silicon rubber radiation shielding material in view of the deficiencies of the above-mentioned prior art. The tungsten boron silicon rubber radiation shielding material improves the dispersibility of tungsten oxide particles in the silicone rubber matrix by introducing white carbon black and tungsten oxide to coat the boron carbide heterogeneous structure particles, enhances the interface interaction between boron carbide and the silicone rubber matrix, ensures the high strength of the material, and improves the enhancement effect of tungsten oxide and boron carbide on the radiation shielding performance of the silicone rubber matrix, effectively solving the problems of low mechanical strength and poor neutron / gamma ray integrated shielding performance of traditional silicone rubber-based radiation shielding materials.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-strength tungsten borosilicate rubber radiation shielding material, characterized in that it includes the following components by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30-50 parts of white carbon black, 90-240 parts of tungsten oxide-coated boron carbide heterostructure particles, 4-10 parts of hydroxyl silicone oil, and 1-2.5 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane; the tensile strength of the tungsten borosilicate rubber radiation shielding material is above 4MPa, the thermal neutron shielding rate when the thickness is 2cm is above 99%, and the cobalt-60 radiation gamma ray shielding rate when the thickness is 2cm is 20%-30%.

[0007] The above-mentioned high-strength tungsten borosilicate rubber radiation shielding material is characterized in that it includes the following components in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 40 parts of white carbon black, 160 parts of tungsten oxide-coated boron carbide heterostructured particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane.

[0008] At the same time, the present invention also discloses a method for preparing the high-strength tungsten borosilicate rubber radiation shielding material as described above, characterized in that the method comprises the following steps:

[0009] Step 1: using γ-aminopropyltriethoxysilane to perform surface modification on tungsten oxide particles;

[0010] Step 2: using dopamine hydrochloride to perform surface modification treatment on boron carbide;

[0011] Step 3: using the tungsten oxide particles subjected to surface modification in step 1 to perform surface grafting on the boron carbide subjected to surface modification in step 2, to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0012] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, the tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill for mixing, and then vulcanize the mixed product to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0013] The above method is characterized in that the mass ratio of the tungsten oxide particles to γ-aminopropyltriethoxysilane in step 1 is 10 to 20:1, the temperature of the surface modification treatment is 50°C to 90°C, and the time is 4h to 10h. The present invention controls the mass ratio of tungsten oxide particles to γ-aminopropyltriethoxysilane to avoid the problem that the mass ratio is too high and sufficient amino functional groups cannot be grafted on the surface of tungsten oxide particles, and the mass ratio is too low and excessive γ-aminopropyltriethoxysilane cannot be grafted on the surface of tungsten oxide particles; by controlling the temperature of the surface modification treatment, it is avoided that the γ-aminopropyltriethoxysilane is too low to be fully hydrolyzed and cannot be grafted on the surface of tungsten oxide particles, and the problem that the γ-aminopropyltriethoxysilane is too high to be decomposed and difficult to graft is avoided; by controlling the surface modification treatment time, it is avoided that the time is too short to graft sufficient amino functional groups on the surface of tungsten oxide particles, and the problem that more amino functional groups cannot be grafted on the surface of tungsten oxide particles due to too long time is avoided.

[0014] The above method is characterized in that the mass ratio of boron carbide to dopamine hydrochloride in step 2 is 10 to 40:1, and the surface modification treatment time is 15 to 30 hours. The present invention controls the mass ratio of boron carbide to dopamine hydrochloride and the surface modification treatment time to avoid the mass ratio being too high and the modification time being too short, resulting in dopamine being unable to fully self-polymerize on the surface of boron carbide to form a sufficient polydopamine layer, and at the same time avoids the mass ratio being too low and the modification time being too long, resulting in the polydopamine layer on the surface of boron carbide being too thick and affecting the material composition.

[0015] The above method is characterized in that the mass ratio of the surface-modified tungsten oxide particles to the surface-modified boron carbide in step 3 is 5 to 9:1, and the surface grafting time is 10 hours to 40 hours. The present invention controls the mass ratio of the surface-modified tungsten oxide particles to the surface-modified boron carbide to avoid too low a mass ratio resulting in less tungsten oxide content on the surface of boron carbide and the inability to ensure the gamma-ray shielding performance of the material, while avoiding too high a mass ratio resulting in excessive tungsten oxide particles being unable to be grafted on the limited surface of boron carbide to form agglomerates; by controlling the surface grafting time, it is avoided that too short a time results in the inability to fully react between the amino groups on the surface of the tungsten oxide particles and the polydopamine on the surface of the boron carbide, and the inability to fully, uniformly and firmly graft the tungsten oxide particles on the surface of the boron carbide, while avoiding too long a time resulting in the reaction being fully completed and more tungsten oxide particles being unable to be grafted on the surface of the boron carbide.

[0016] The above method is characterized in that the mixing speed in step 4 is 10rpm-30rpm, the mixing time is 30min-60min, the vulcanization temperature is 160℃-180℃, and the vulcanization time is 10min-20min. The present invention controls the mixing speed to avoid the mixing speed being too low to cause the shear force to be small and the components cannot be fully blended, and avoids the mixing speed being too high to cause shear heat generation and affect the material properties, and controls the mixing time to avoid the mixing time being too short to cause the components to be fully and evenly blended, and avoid the mixing time being too long to cause shear heat generation and affect the material properties; by controlling the vulcanization temperature and time, avoid the vulcanization temperature being too low and the vulcanization time being too short to cause incomplete vulcanization and affect the material yield and performance, and avoid the vulcanization temperature being too high and the vulcanization time being too long to cause the vulcanized rubber to be overmature and affect its performance.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention introduces tungsten oxide-coated boron carbide heterogeneous structure particles into tungsten boron silicone rubber radiation shielding materials, thereby improving the dispersibility of tungsten oxide particles in the silicone rubber matrix and enhancing the interface interaction between boron carbide and the silicone rubber matrix, thereby effectively exerting the role of boron carbide in effectively absorbing thermal neutrons and tungsten oxide in efficiently shielding gamma rays, thereby improving the enhancement effect of tungsten oxide and boron carbide on the mechanical strength and neutron / gamma ray comprehensive shielding performance of silicone rubber composite materials.

[0019] 2. The present invention introduces white carbon black reinforcement into the tungsten boron silicon rubber radiation shielding material, thereby compensating for the significant damage to the mechanical strength of the silicone rubber composite material caused by high content of tungsten oxide and boron carbide, giving the material high strength, thereby ensuring the use of the shielding material under complex working conditions.

[0020] 3. The tungsten oxide-coated boron carbide heterostructure particles in the present invention are synthesized by surface grafting modified tungsten oxide particles onto modified boron carbide. The two are firmly bonded by chemical bonds, which improves the chemically inert surface of boron carbide and avoids agglomeration of tungsten oxide particles.

[0021] 4. The tungsten borosilicate rubber radiation shielding material prepared by the present invention has excellent mechanical strength and neutron / gamma ray shielding performance, and is suitable for personal radiation protection and peripheral radiation protection fields such as nuclear facilities, nuclear equipment, and nuclear instruments. The preparation method is green and environmentally friendly, simple and efficient, and easy to realize mass production, and has good application prospects in the nuclear industry.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a SEM image of the tungsten oxide-coated boron carbide heterostructure particles prepared in Example 1 of the present invention.

[0024] Figure 2 The infrared spectra of tungsten oxide, tungsten oxide after surface modification, boron carbide, boron carbide after surface modification, and tungsten oxide-coated boron carbide heterostructure particles in Example 1 of the present invention are shown.

[0025] Figure 3 Graph showing tensile strength and elongation at break of the materials prepared in Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.

[0026] Figure 4 Graph showing the neutron and gamma-ray shielding rates of the materials prepared in Example 1 and Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0027] Example 1

[0028] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 40 parts of white carbon black, 90 parts of tungsten oxide-coated boron carbide heterostructure particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0029] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0030] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 20:1 were subjected to surface modification treatment at 75° C. for 6 hours;

[0031] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 20:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 20 hours;

[0032] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 5:1 to a 10 mM Tris buffer solution for surface grafting reaction for 40 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0033] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, the tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 20 rpm for 40 minutes, then vulcanize the mixed product at 170°C for 15 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0034] Figure 1This is the SEM image of the tungsten oxide-coated boron carbide heterostructure particles prepared in this example. Figure 1 It can be seen that the tungsten oxide particles have been successfully and evenly coated on the surface of the boron carbide particles, indicating that the tungsten oxide-coated boron carbide heterostructure particles have been successfully prepared.

[0035] Figure 2 The infrared spectra of tungsten oxide, tungsten oxide after surface modification, boron carbide, boron carbide after surface modification, and tungsten oxide-coated boron carbide heterostructure particles in this embodiment are shown in FIG. Figure 2 It can be seen that the present invention successfully utilizes γ-aminopropyltriethoxysilane to perform surface modification on tungsten oxide, successfully utilizes dopamine hydrochloride to perform surface modification on boron carbide, and successfully hybridizes the modified boron carbide and modified tungsten oxide to obtain tungsten oxide-coated boron carbide heterostructure particles.

[0036] Example 2

[0037] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 50 parts of white carbon black, 120 parts of tungsten oxide-coated boron carbide heterostructure particles, 10 parts of hydroxy silicone oil, and 2.5 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0038] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0039] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 20:1 were subjected to surface modification treatment at 75° C. for 6 hours;

[0040] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 20:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 20 hours;

[0041] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 5:1 to a 10 mM Tris buffer solution for surface grafting reaction for 40 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0042] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 20 rpm for 50 minutes, then vulcanize the mixed product at 170°C for 15 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0043] Example 3

[0044] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 30 parts of white carbon black, 120 parts of tungsten oxide-coated boron carbide heterostructure particles, 4 parts of hydroxy silicone oil, and 1 part of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0045] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0046] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 15:1 were subjected to surface modification treatment at 90° C. for 4 hours;

[0047] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 10:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 30 hours;

[0048] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 7:1 to a 10 mM Tris buffer solution for surface grafting reaction for 20 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0049] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 15 rpm for 60 minutes, then vulcanize the mixed product at 160°C for 20 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0050] Example 4

[0051] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of white carbon black, 160 parts of tungsten oxide-coated boron carbide heterostructure particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0052] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0053] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 15:1 were subjected to surface modification treatment at 90° C. for 4 hours;

[0054] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 10:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 30 hours;

[0055] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 7:1 to a 10 mM Tris buffer solution for surface grafting reaction for 20 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0056] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 30 rpm for 30 minutes, then vulcanize the mixed product at 180°C for 10 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0057] Example 5

[0058] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of white carbon black, 200 parts of tungsten oxide-coated boron carbide heterostructure particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0059] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0060] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 10:1 were subjected to surface modification treatment at 50° C. for 10 h;

[0061] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 40:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 15 hours;

[0062] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 9:1 to a 10 mM Tris buffer solution for surface grafting reaction for 10 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0063] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 10 rpm for 60 minutes, then vulcanize the mixed product at 170°C for 16 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0064] Example 6

[0065] The high-strength tungsten borosilicate rubber radiation shielding material of this embodiment includes the following components by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 40 parts of white carbon black, 240 parts of tungsten oxide-coated boron carbide heterostructure particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0066] The method for preparing the high-strength tungsten borosilicate rubber radiation shielding material of this embodiment comprises the following steps:

[0067] Step 1: γ-aminopropyltriethoxysilane and tungsten oxide particles with a mass ratio of 10:1 were subjected to surface modification treatment at 50° C. for 10 h;

[0068] Step 2: Add boron carbide and dopamine hydrochloride in a mass ratio of 40:1 into a 10 mM Tris buffer solution in sequence for surface modification treatment for 15 hours;

[0069] Step 3: adding the tungsten oxide particles after surface modification in step 1 and the boron carbide after surface modification in step 2 in a mass ratio of 9:1 to a 10 mM Tris buffer solution for surface grafting reaction for 10 hours to obtain tungsten oxide-coated boron carbide heterostructure particles;

[0070] Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix at a speed of 10 rpm for 60 minutes, then vulcanize the mixed product at 180°C for 16 minutes to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

[0071] Comparative Example 1

[0072] The silicone rubber composite material of this comparative example includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of white carbon black, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0073] The preparation method of the silicone rubber composite material of this comparative example is: add methyl vinyl silicone rubber raw rubber, white carbon black, hydroxy silicone oil and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix them at a speed of 20 rpm for 40 minutes, and then vulcanize the mixed product at 170°C for 15 minutes to obtain a silicone rubber composite material.

[0074] Comparative Example 2

[0075] The silicone rubber composite material of this comparative example includes the following components by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of white carbon black, 75 parts of tungsten oxide, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane;

[0076] The preparation method of the silicone rubber composite material of this comparative example is: add methyl vinyl silicone rubber raw rubber, white carbon black, hydroxy silicone oil and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill and mix them at a speed of 20 rpm for 40 minutes, and then vulcanize the mixed product at 170°C for 15 minutes to obtain a silicone rubber composite material.

[0077] The tungsten borosilicate rubber radiation shielding materials prepared in Examples 1 to 6 of the present invention and the silicone rubber composite materials prepared in Comparative Examples 1 to 2 were subjected to tensile properties, γ-ray ( 60 The shielding performance of the embodiment 1 to 6 is shown in Table 1 below.

[0078] Table 1

[0079]

[0080]

[0081] As can be seen from Table 1, the addition of tungsten oxide-coated boron carbide heterostructure particles in the present invention enables the tensile strength of the tungsten borosilicate rubber radiation shielding material to remain above 4MPa, the thermal neutron shielding rate when the thickness is 2cm is above 99%, and the cobalt-60 radiation gamma ray shielding rate when the thickness is 2cm is 20% to 30%, which can be applied to personal radiation protection and peripheral radiation protection of nuclear facilities, nuclear equipment, nuclear instruments and other fields.

[0082] Figure 3 The tensile strength and elongation at break of the materials prepared in Example 1, Comparative Example 1 and Comparative Example 2 of the present invention are shown in FIG. Figure 3 It can be seen that the addition of shielding filler tungsten oxide significantly reduces the tensile properties of silica reinforced silicone rubber composites, but the preparation of tungsten oxide-coated boron carbide heterostructure particles effectively weakens the degree of damage of tungsten oxide and boron carbide to the tensile properties of silicone rubber composites.

[0083] Figure 4 The neutron and gamma-ray shielding efficiency diagrams of the materials prepared in Example 1 and Comparative Example 2 of the present invention are shown in FIG. Figure 4 It can be seen that compared with the conventional shielding filler tungsten oxide, the preparation of tungsten oxide-coated boron carbide heterostructure particles effectively enhances the neutron / gamma-ray shielding performance enhancement effect of tungsten oxide and boron carbide on silicone rubber.

[0084] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high-strength tungsten borosilicate rubber radiation shielding material, characterized in that: The invention comprises the following ingredients in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30-50 parts of white carbon black, 90-240 parts of tungsten oxide coated boron carbide heterostructure particles, 4-10 parts of hydroxy silicone oil, and 1-2.5 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane; the tensile strength of the tungsten borosilicate rubber radiation shielding material is above 4MPa, the thermal neutron shielding rate is above 99% when the thickness is 2cm, and the cobalt-60 radiation gamma ray shielding rate is 20%-30% when the thickness is 2cm.

2. The high-strength tungsten borosilicate rubber radiation shielding material according to claim 1, characterized in that: The composition includes the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 40 parts of white carbon black, 160 parts of tungsten oxide-coated boron carbide heterostructure particles, 6 parts of hydroxy silicone oil, and 2 parts of 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane.

3. A method for preparing the high-strength tungsten borosilicate rubber radiation shielding material as claimed in claims 1 and 2, characterized in that: The method comprises the following steps: Step 1: using γ-aminopropyltriethoxysilane to perform surface modification on tungsten oxide particles; Step 2: using dopamine hydrochloride to perform surface modification treatment on boron carbide; Step 3: using the tungsten oxide particles subjected to surface modification in step 1 to perform surface grafting on the boron carbide subjected to surface modification in step 2, to obtain tungsten oxide-coated boron carbide heterostructure particles; Step 4: Add methyl vinyl silicone rubber raw rubber, white carbon black, the tungsten oxide-coated boron carbide heterostructure particles obtained in step 3, hydroxy silicone oil, and 2,5-dimethyl-2,5-bis-(tert-butylperoxy)hexane into an open mill for mixing, and then vulcanize the mixed product to obtain a high-strength tungsten borosilicate rubber radiation shielding material.

4. The method according to claim 3, characterized in that In step 1, the mass ratio of the tungsten oxide particles to γ-aminopropyltriethoxysilane is 10 to 20:1, the temperature of the surface modification treatment is 50° C. to 90° C., and the time is 4 h to 10 h.

5. The method according to claim 3, characterized in that: In step 2, the mass ratio of boron carbide to dopamine hydrochloride is 10 to 40:1, and the surface modification treatment time is 15 to 30 hours.

6. The method according to claim 3, characterized in that In step 3, the mass ratio of the surface-modified tungsten oxide particles to the surface-modified boron carbide is 5 to 9:1, and the surface grafting time is 10 hours to 40 hours.

7. The method according to claim 3, characterized in that In step 4, the mixing speed is 10 rpm to 30 rpm, the mixing time is 30 min to 60 min, the vulcanization temperature is 160° C. to 180° C., and the vulcanization time is 10 min to 20 min.

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