High-temperature-resistant irradiation-resistant neutron shielding material and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant irradiation-resistant neutron shielding material and a preparation method thereof. The neutron shielding material is prepared from the following raw materials in parts by weight: 40-45 parts of high-density polyethylene, 1-3 parts of a boron compound, 50-60 parts of hydroxide, 1-2 parts of stearic acid, 1-2 parts of ethylene bis stearamide, 1-2 parts of an antioxidant and 1-4 parts of an MOF material. The MOF material is Pb ((TPA) DMF) 2. H2O; the preparation method comprises the following steps: S1, mixing: respectively weighing and mixing the high-density polyethylene, the boron compound, the hydroxide, the stearic acid, the ethylene bis-stearamide, the antioxidant and the MOF material, and carrying out primary preheating; s2, performing granulation: performing granulation and performing drying; and S3, pressing is conducted, specifically, secondary preheating and pressurizing forming are conducted, and demolding is conducted after cooling. The neutron shielding material is simple in formula, excellent in economical efficiency and good in neutron shielding effect, the high temperature resistance and irradiation resistance of the material are greatly improved, and the preparation method is simple, convenient and feasible.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear radiation shielding materials, and in particular to a high temperature and radiation resistant neutron shielding material and a preparation method thereof. Background Art

[0002] The reactor core will produce a large number of high-energy neutrons. In order to reduce the activation of the surrounding main equipment by the neutrons produced by the core and the radiation dose to the operators, the third-generation nuclear power units such as Hualong One and EPR are equipped with neutron shielding devices on the main pipelines around the reactor pressure vessel pit. The design conditions of the device put forward requirements for the device materials: the material has excellent shielding performance, can operate stably for 60 years at 90°C and can withstand short-term high-temperature disturbance conditions; the material has good shielding performance at high neutron flux (10 17 n / cm 3 ) The performance remains stable under radiation environment; the material has flame retardant function under fire conditions.

[0003] The existing resin-based shielding materials have the following main shortcomings under the design conditions of nuclear power main pipeline shielding: 1. The processing performance of resin-based materials after casting is poor. If they need to be machined again, it is easy to cause defects such as material cracking; 2. The material is brittle and requires additional measures to protect it during transportation; 3. During the casting process, it is difficult to control the uniformity of the material through stirring and other measures; 4. The material cost is relatively high.

[0004] Among the existing boron-containing polyethylene shielding materials, boron-containing polyethylene is a flammable item, which will further intensify combustion under conditions such as fire, which is not conducive to timely disaster relief. At the same time, the high temperature and radiation resistance of this shielding material are relatively weak, and it must be inspected and replaced regularly during service. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high temperature resistant and radiation resistant neutron shielding material and a preparation method thereof.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a high temperature and radiation resistant neutron shielding material, which is made of the following raw materials in parts by weight: 40-45 parts of high-density polyethylene, 1-3 parts of boron compounds, 50-60 parts of hydroxides, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide, 1-2 parts of antioxidants and 1-4 parts of MOF materials; the MOF material is Pb((TPA)DMF)2·H2O.

[0007] In some embodiments, Pb((TPA)DMF)2·H2O is prepared by the following preparation method: Pb(NO3)2, H2TPA, DMF and water are mixed and heated, and then washed and dried after cooling.

[0008] In some embodiments, the high density polyethylene has a weight average molecular weight of 50,000 to 1,000,000.

[0009] In some embodiments, the boron compound is boron carbide, boron nitride, or boron oxide.

[0010] In some embodiments, the hydroxide includes at least one of magnesium hydroxide, aluminum hydroxide, and zinc hydroxide.

[0011] In some embodiments, the antioxidant includes at least one of antioxidant 168 and antioxidant 1010 .

[0012] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0013] S1. Mixing: Weigh 40-45 parts of high-density polyethylene, 1-3 parts of boron compound, 50-60 parts of hydroxide, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide, 1-2 parts of antioxidant and 1-4 parts of MOF material respectively, mix them, and perform the first preheating to obtain a mixture;

[0014] S2, granulation: granulating and drying the mixture to obtain granules;

[0015] S3. Pressing: placing the granules in a mold, preheating for a second time and then pressurizing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material.

[0016] In some embodiments, in step S1, the first preheating temperature is 40-80° C. and the time is 20-40 min.

[0017] In some embodiments, in step S2, the granulation temperature is 140-165°C, the granulation time is 5-15 min; and the extrusion temperature after granulation is 260-280°C.

[0018] In some embodiments, in step S3, the second preheating temperature is 130-150° C., the time is 2-5 min, and the pressurization pressure is 1.5-3 MPa.

[0019] Beneficial effects of the present invention:

[0020] In the high temperature and radiation resistant neutron shielding material of the present invention, high density polyethylene is used as a shielding substrate, boron compounds are used as neutron absorbers, and hydroxides are used to perform flame retardant and smoke elimination functions, and the high temperature resistance of the material can also be improved. Adding MOF materials can greatly improve the radiation resistance and ray shielding capabilities of the neutron shielding material. The neutron shielding material of the present invention has a simple formula, excellent economic efficiency, good neutron shielding effect, and greatly improved high temperature resistance and radiation resistance of the material.

[0021] The preparation method of the high temperature and radiation resistant neutron shielding material of the present invention is simple and feasible, and has the advantages of good material economy and easy large-scale application. The prepared neutron shielding material has excellent high temperature resistance and radiation resistance, and is suitable for neutron shielding in high temperature and high radiation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0023] Figure 1 It is the XRD spectrum of the Pb-TPA material prepared by the present invention;

[0024] Figure 2 It is the DTG curve diagram of the Pb-TPA material prepared in the present invention. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will be further described in detail below in conjunction with embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0026] The invention provides a high temperature and radiation resistant neutron shielding material, which can be used for a neutron shielding device of a nuclear power plant reactor. The neutron shielding material is made of the following raw materials in parts by weight: 40-45 parts of high density polyethylene (HDPE), 1-3 parts of a boron compound, 50-60 parts of a hydroxide, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide (EBS), 1-2 parts of an antioxidant and 1-4 parts of a MOF material (Metal-Organic Framework). Specifically, high-density polyethylene can be selected in 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, etc., boron compounds can be selected in 1 part, 2 parts, 3 parts, etc., hydroxides can be selected in 50 parts, 53 parts, 55 parts, 58 parts, 60 parts, etc., stearic acid can be selected in 1 part, 1.5 parts, 2 parts, etc., vinyl bisstearamide can be selected in 1 part, 1.5 parts, 2 parts, etc., antioxidants can be selected in 1 part, 1.5 parts, 2 parts, etc., and MOF materials can be selected in 1 part, 2 parts, 3 parts, 4 parts, etc.

[0027] The above-mentioned MOF material is Pb((TPA)DMF)2·H2O (hereinafter referred to as Pb-TPA material), wherein TPA is deprotonated terephthalic acid and DMF is N,N-dimethylformamide. Preferably, the Pb-TPA material is prepared by the following preparation method: Pb(NO3)2 (lead nitrate), H2TPA (terephthalic acid), DMF and water are mixed and heated, and then washed and dried after cooling. Specifically, Pb(NO3)2 4-5g, H2TPA 1-2g, DMF 14-20mL and water 2-6mL are mixed and heated at 70-90°C for 2-4 days, cooled to room temperature, washed with ethanol, and dried at 40-80°C to obtain colorless Pb-TPA crystals.

[0028] In some embodiments, the Pb-TPA material is prepared by the following preparation method: Pb(NO3)2 3.31g (10mmol), H2TPA 1.66g (10mmol), DMF 16mL and deionized water 4mL are mixed, heated at 80°C for 3 days, cooled to room temperature, washed with ethanol, and dried at 60°C (such as in a drying oven) to obtain colorless crystals. The colorless crystals are subjected to X-ray diffraction (XRD) analysis and differential thermogravimetric analysis (DTG) analysis, and the test results are as follows: Figure 1 , 2 As shown. The chemical structure is determined based on the XRD pattern. Figure 1 It can be seen that the colorless crystals obtained are Pb-TPA materials. Figure 2 It can be seen that the thermal stability of Pb-TPA material can reach above 400 degrees Celsius. The first decomposition temperature on the curve is the degradation of DMF coordinated in the Pb-TPA material, which does not affect the stability of the material and will not cause a significant decrease in the material's high temperature resistance.

[0029] Due to the addition of a certain amount of MOF material, the material can eliminate the free radicals generated during the irradiation process and greatly improve the radiation resistance of the neutron shielding material. At the same time, the MOF material introduces the conjugated structure of lead and benzene, which can improve the radiation shielding ability of the material.

[0030] The present invention adopts high-density polyethylene as the shielding substrate, and the high-density polyethylene has good neutron shielding performance. Preferably, the weight average molecular weight of the high-density polyethylene is 50,000-1,000,000. It can be understood that the weight average molecular weight can be selected according to actual needs, and the present invention does not make specific restrictions, and the weight average molecular weight can be within 50,000-1,000,000.

[0031] The boron compound is used as a neutron absorber, and the boron compound may be boron carbide, boron nitride or boron oxide.

[0032] The hydroxide plays the role of flame retardant and smoke extinguishing. The hydroxide may include at least one of magnesium hydroxide, aluminum hydroxide and zinc hydroxide. It can be understood that the hydroxide may be one component, such as magnesium hydroxide, aluminum hydroxide or zinc hydroxide; or, the hydroxide may include two components, such as magnesium hydroxide and aluminum hydroxide, magnesium hydroxide and zinc hydroxide, aluminum hydroxide and zinc hydroxide; or, the hydroxide includes magnesium hydroxide, aluminum hydroxide and zinc hydroxide. Due to the addition of a certain amount of hydroxide, the neutron shielding material has a higher flame retardant property, can be used in an environment with a fire risk, and also improves the high temperature resistance of the neutron shielding material.

[0033] The antioxidant may include at least one of antioxidant 168 (a commercial product) and antioxidant 1010 (a commercial product). It can be understood that the antioxidant may be antioxidant 168 or antioxidant 1010, or the antioxidant includes antioxidant 168 and antioxidant 1010.

[0034] The present invention also provides a method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material, comprising the following steps, where the raw materials are calculated by weight:

[0035] S1. Mixing: Weigh 40-45 parts of high-density polyethylene, 1-3 parts of boron compound, 50-60 parts of hydroxide, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide, 1-2 parts of antioxidant and 1-4 parts of MOF material respectively, mix them, and perform the first preheating to obtain a mixture. The components of the boron compound, hydroxide, antioxidant and MOF material are the same as those described above and will not be repeated here.

[0036] In step S1, the temperature of the first preheating is 40-80°C, and the time is 20-40 min. Specifically, the temperature can be 40°C, 50°C, 60°C, 70°C, 80°C, etc., and the time can be 20 min, 25 min, 30 min, 35 min, 40 min, etc. In some embodiments, the mixing can be carried out in a high-speed mixer, and high-density polyethylene, boron compound, hydroxide, stearic acid, vinyl bisstearamide, antioxidant and MOF material are sequentially placed in the high-speed mixer and fully mixed so that the raw materials are evenly dispersed.

[0037] S2. Granulation: Granulate the mixture and dry it to obtain granules.

[0038] In step S2, the granulation temperature is 140-165°C, the granulation time is 5-15min, and the extrusion temperature after granulation is 260-280°C. Specifically, the granulation temperature can be 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, etc., the granulation time can be 5min, 8min, 10min, 12min, 15min, etc., and the extrusion temperature after granulation can be 260°C, 265°C, 270°C, 275°C, 280°C, etc. Granulation can be performed in a twin-screw extruder.

[0039] S3. Pressing: placing the granules in a mold, preheating for a second time and then pressurizing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material.

[0040] In step S3, the second preheating temperature is 130-150°C, and the time is 2-5min. Specifically, the temperature can be 130°C, 135°C, 140°C, 145°C, 150°C, etc., and the time can be 2min, 3min, 4min, 5min, etc.; the pressurization pressure is 1.5-3MPa, and 1.5MPa, 2MPa, 2.5MPa, 3MPa, etc. can be selected. In some embodiments, the prepared neutron shielding material can be in a cylindrical, spherical or conical shape, and the shape of the neutron shielding material can be selected according to actual needs, and the present invention does not make specific limitations.

[0041] The following is described by specific examples:

[0042] Example 1

[0043] A high temperature resistant and radiation resistant neutron shielding material is made of the following raw materials in parts by weight: 40 parts of HDPE, 1 part of boron carbide, 55 parts of magnesium hydroxide, 2 parts of stearic acid, 1 part of EBS, 1 part of antioxidant 168 and 2 parts of Pb-TPA material.

[0044] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0045] S1. Mixing: Weigh 40 parts of HDPE, 1 part of boron carbide, 55 parts of magnesium hydroxide, 2 parts of stearic acid, 1 part of EBS, 1 part of antioxidant 168 and 2 parts of Pb-TPA material respectively, mix them, and perform the first preheating to obtain a mixture. The mixing is performed in a high-speed mixer, and the first preheating temperature is 60° C. and the time is 30 minutes.

[0046] S2, granulation: granulate the mixture and dry it to obtain granules. The granulation is carried out in a twin-screw extruder, the granulation temperature is 155°C, the granulation time is 10 minutes, and the extrusion temperature after granulation is 270°C.

[0047] S3, pressing: placing the pellets in a mold, preheating for the second time and then pressing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material. The second preheating temperature is 140°C and the time is 3 minutes.

[0048] Example 2

[0049] A high temperature resistant and radiation resistant neutron shielding material is made of the following raw materials in parts by weight: 45 parts of HDPE, 2 parts of boron nitride, 50 parts of aluminum hydroxide, 1 part of stearic acid, 2 parts of EBS, 1 part of antioxidant 1010 and 1 part of Pb-TPA material.

[0050] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0051] S1. Mixing: Weigh 45 parts of HDPE, 2 parts of boron nitride, 50 parts of aluminum hydroxide, 1 part of stearic acid, 2 parts of EBS, 1 part of antioxidant 1010 and 1 part of Pb-TPA material respectively, mix them, and perform the first preheating to obtain a mixture. The mixing is performed in a high-speed mixer, and the first preheating temperature is 50° C. and the time is 35 minutes.

[0052] S2, granulation: granulate the mixture and dry it to obtain granules. The granulation is carried out in a twin-screw extruder, the granulation temperature is 150°C, the granulation time is 12 minutes, and the extrusion temperature after granulation is 265°C.

[0053] S3, pressing: placing the pellets in a mold, preheating for the second time and then pressing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material. The second preheating temperature is 135°C and the time is 3 minutes.

[0054] Example 3

[0055] A high temperature resistant and radiation resistant neutron shielding material is made of the following raw materials in parts by weight: 45 parts of HDPE, 3 parts of boron oxide, 60 parts of zinc hydroxide, 1 part of stearic acid, 2 parts of EBS, 1 part of antioxidant 1010 and 3 parts of Pb-TPA material.

[0056] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0057] S1. Mixing: Weigh 45 parts of HDPE, 3 parts of boron oxide, 60 parts of zinc hydroxide, 1 part of stearic acid, 2 parts of EBS, 1 part of antioxidant 1010 and 3 parts of Pb-TPA material respectively, mix them, and perform the first preheating to obtain a mixture. The mixing is performed in a high-speed mixer, and the first preheating temperature is 70° C. and the time is 25 minutes.

[0058] S2, granulation: granulate the mixture and dry it to obtain granules. The granulation is carried out in a twin-screw extruder, the granulation temperature is 160°C, the granulation time is 8 minutes, and the extrusion temperature after granulation is 275°C.

[0059] S3, pressing: placing the pellets in a mold, preheating for the second time and then pressing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material. The second preheating temperature is 145°C and the time is 4 minutes.

[0060] Example 4

[0061] A high temperature and radiation resistant neutron shielding material is made of the following raw materials in parts by weight: 43 parts of HDPE, 1.5 parts of boron carbide, 25 parts of magnesium hydroxide, 30 parts of aluminum hydroxide, 1.5 parts of stearic acid, 1.5 parts of EBS, 0.5 parts of antioxidant 168, 1 part of antioxidant 1010 and 1.5 parts of Pb-TPA material.

[0062] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0063] S1. Mixing: Weigh 43 parts of HDPE, 1.5 parts of boron carbide, 25 parts of magnesium hydroxide, 30 parts of aluminum hydroxide, 1.5 parts of stearic acid, 1.5 parts of EBS, 0.5 parts of antioxidant 168, 1 part of antioxidant 1010 and 1.5 parts of Pb-TPA material respectively, mix them, and perform the first preheating to obtain a mixture. The mixing is performed in a high-speed mixer, and the first preheating temperature is 40° C. and the time is 40 minutes.

[0064] S2, granulation: granulate the mixture and dry it to obtain granules. The granulation is carried out in a twin-screw extruder, the granulation temperature is 140°C, the granulation time is 15 minutes, and the extrusion temperature after granulation is 260°C.

[0065] S3, pressing: placing the pellets in a mold, preheating for the second time and then pressing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material. The second preheating temperature is 130°C and the time is 5 minutes.

[0066] Example 5

[0067] A high temperature resistant and radiation resistant neutron shielding material is made of the following raw materials in parts by weight: 42.5 parts of HDPE, 2.5 parts of boron nitride, 20 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 20 parts of zinc hydroxide, 2 parts of stearic acid, 1 part of EBS, 2 parts of antioxidant 1010 and 4 parts of Pb-TPA material.

[0068] A method for preparing the above-mentioned high temperature resistant and radiation resistant neutron shielding material comprises the following steps, wherein the raw materials are calculated by weight:

[0069] S1. Mixing: Weigh 42.5 parts of HDPE, 2.5 parts of boron nitride, 20 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 20 parts of zinc hydroxide, 2 parts of stearic acid, 1 part of EBS, 2 parts of antioxidant 1010 and 4 parts of Pb-TPA material respectively, mix them, and perform the first preheating to obtain a mixture. The mixing is performed in a high-speed mixer, and the first preheating temperature is 80° C. and the time is 20 minutes.

[0070] S2, granulation: granulate the mixture and dry it to obtain granules. The granulation is carried out in a twin-screw extruder, the granulation temperature is 165°C, the granulation time is 5 minutes, and the extrusion temperature after granulation is 280°C.

[0071] S3, pressing: placing the pellets in a mold, preheating for the second time and then pressing and molding, demolding after cooling, and obtaining a high temperature and radiation resistant neutron shielding material. The second preheating temperature is 150°C and the time is 2 minutes.

[0072] Performance test:

[0073] The neutron shielding materials prepared in Examples 1 to 3 were tested for high temperature resistance and flame retardancy, wherein the thermal decomposition temperature was measured with reference to the national standard GB / T 33047.1, and the softening temperature was measured with reference to the national standard GB / T 1633; the material was pressed into a sample with a thickness of 5 cm, and the oxygen index was measured by a limiting oxygen index instrument, and the test results are shown in Table 1. The neutron shielding material prepared in Example 1 was subjected to an accelerated high temperature aging test and an irradiation aging test, wherein the accelerated high temperature aging test was carried out at 120°C, 160°C, 170°C and 180°C respectively with reference to the national standard GB / T 24135, and a linear fitting was performed based on the test results to estimate the service life of the neutron shielding material at 90°C, 100°C and 110°C when the weight loss was 5%, respectively, and the calculation results are shown in Table 2; the neutron density was 2×10 17 n / cm 3 The irradiation dose is 2×10 6 Gy radiation aging test, the test results are shown in Table 3.

[0074] Table 1 High temperature resistance and flame retardancy of neutron shielding materials

[0075] Thermal decomposition temperature / ℃ Softening temperature / ℃ Oxygen Index Example 1 325 181 31.2 Example 2 328 184 30.5 Example 3 332 186 32

[0076] Table 2 Service life of neutron shielding materials at 90℃, 100℃, 110℃ with 5% weight loss

[0077] Test temperature / ℃ 5% lifespan / day 5% service life / year 90 23011 63.04 100 11470 31.43 110 5929 16.24

[0078] Table 3 Comparison of mechanical properties of neutron shielding materials before and after irradiation

[0079]

[0080] According to the test results in Table 1, the thermal decomposition temperature and softening temperature of the neutron shielding material of the present invention are both high, indicating good high temperature resistance; the oxygen index is high, indicating that the material has high flame retardant properties. According to the test results in Table 2, the 5% service life of the neutron shielding material of the present invention at 90°C exceeds 60 years, and has excellent high temperature aging performance, which indicates that the material has excellent heat resistance.

[0081] The results of the irradiation aging test show that the size and weight of the neutron shielding material have not changed significantly after irradiation. According to the mechanical properties comparison results in Table 3, the tensile fracture strength of the material has increased after irradiation, indicating that the neutron shielding material has excellent radiation resistance.

[0082] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0083] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A high temperature and radiation resistant neutron shielding material, characterized in that: The invention is prepared from the following raw materials in parts by weight: 40-45 parts of high-density polyethylene, 1-3 parts of boron compound, 50-60 parts of hydroxide, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide, 1-2 parts of antioxidant and 1-4 parts of MOF material; the MOF material is Pb((TPA)DMF)2·H2O.

2. The high temperature and radiation resistant neutron shielding material according to claim 1, characterized in that: Pb((TPA)DMF)2·H2O is prepared by the following preparation method: Pb(NO3)2, H2TPA, DMF and water are mixed and heated, and then washed and dried after cooling.

3. The high temperature and radiation resistant neutron shielding material according to claim 1, characterized in that: The weight average molecular weight of the high-density polyethylene is 50,000-1,000,000.

4. The high temperature and radiation resistant neutron shielding material according to claim 1, characterized in that: The boron compound is boron carbide, boron nitride or boron oxide.

5. The high temperature and radiation resistant neutron shielding material according to claim 1, characterized in that: The hydroxide includes at least one of magnesium hydroxide, aluminum hydroxide and zinc hydroxide.

6. The high temperature and radiation resistant neutron shielding material according to claim 1, characterized in that: The antioxidant includes at least one of the antioxidant 168 and the antioxidant 1010 .

7. A method for preparing the high temperature and radiation resistant neutron shielding material according to any one of claims 1 to 6, characterized in that: The method comprises the following steps, wherein the raw materials are measured by weight: S1. Mixing: Weigh 40-45 parts of high-density polyethylene, 1-3 parts of boron compound, 50-60 parts of hydroxide, 1-2 parts of stearic acid, 1-2 parts of vinyl bisstearamide, 1-2 parts of antioxidant and 1-4 parts of MOF material respectively, mix them, and perform the first preheating to obtain a mixture; S2, granulation: granulating and drying the mixture to obtain granules; S3. Pressing: placing the granules in a mold, performing a second preheating and then pressurizing to form, and demolding after cooling to obtain a high temperature and radiation resistant neutron shielding material.

8. The method for preparing the high temperature and radiation resistant neutron shielding material according to claim 7, characterized in that: In the step S1, the first preheating temperature is 40 to 80° C. and the time is 20 to 40 minutes.

9. The method for preparing the high temperature and radiation resistant neutron shielding material according to claim 7, characterized in that: In the step S2, the granulation temperature is 140-165°C, the granulation time is 5-15 minutes, and the extrusion temperature after granulation is 260-280°C.

10. The method for preparing a high temperature and radiation resistant neutron shielding material according to claim 7, characterized in that: In the step S3, the second preheating temperature is 130-150°C, the time is 2-5 minutes, and the pressurization pressure is 1.5-3 MPa.

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