A radiation-resistant fire-retardant coating and its preparation method

Abstract

This invention belongs to the field of coating technology, specifically relating to a radiation-resistant fire-retardant coating and its preparation method. The radiation-resistant fire-retardant coating comprises component A and component B. By weight, component A includes 15-35 parts of silicone-modified epoxy resin, 5-10 parts of reactive diluent, 20-50 parts of dehydration-to-char catalyst, 3-10 parts of foaming agent, 5-10 parts of flame retardant, 0.1-0.5 parts of expanded graphite, 5-10 parts of refractory fiber, and 3-15 parts of radiation-resistant filler; the radiation-resistant filler includes silane coupling agent-modified nano-barium sulfate and micron-sized boron carbide; component B is an amine curing agent. This invention proposes a radiation-resistant fire-retardant coating and its preparation method, which, by using a specific silane coupling agent to modify micro-nano radiation-resistant fillers, effectively improves the uniformity of the coating's radiation protection performance and its fire resistance after radiation exposure, enabling its widespread application in nuclear power plants and various nuclear industry facilities.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a radiation-resistant fire-retardant coating and its preparation method. Background Technology

[0002] Radiation-resistant fire-retardant coatings are a special type of coating that must possess both fire-retardant properties and the ability to withstand radiation environments. These coatings have important applications in special locations such as nuclear facilities and radioactive laboratories.

[0003] Fire-retardant coatings for steel structures include two types: intumescent and non-intumescent. When intumescent fire-retardant coatings are exposed to fire and heat, the carbonizing agent undergoes esterification and dehydration to form carbon under the action of a catalyst. The carbides then form a closed, three-dimensional honeycomb-like carbonized layer under the action of the inert gas released from the decomposition of the foaming agent. This carbonized layer can seal the protected substrate, prevent gas diffusion, and at the same time prevent external oxygen from diffusing to the surface of the substrate, thus achieving the purpose of fireproofing and heat insulation.

[0004] Current intumescent fire-retardant coatings for steel structures are composed of organic and inorganic base materials, fire-retardant additives, catalysts, foaming agents, etc., and have good fire-retardant and flame-retardant properties. However, the radiation-resistant fire-retardant coatings currently prepared often have problems such as uneven radiation protection performance of the coating, poor fire resistance after radiation exposure, and severe degradation of heat insulation efficiency.

[0005] Therefore, there is an urgent need to provide a high-performance radiation-resistant fire-retardant coating that can improve the uniformity of radiation protection and the fire resistance after radiation exposure. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a radiation-resistant fire-retardant coating and its preparation method, which effectively improves the uniformity of radiation protection performance and the fire resistance performance after radiation by using a specific silane coupling agent to modify micro-nano radiation-resistant fillers.

[0007] This invention provides a radiation-resistant fire-retardant coating.

[0008] Specifically, a radiation-resistant fire-retardant coating includes component A and component B. Component A includes silicone-modified epoxy resin, reactive diluent, dehydration and charring catalyst, foaming agent, flame retardant, expanded graphite, refractory fiber, and radiation-resistant filler. The radiation-resistant filler includes silane coupling agent-modified barium sulfate and boron carbide. The barium sulfate has a particle size of 50-200 nm, and the boron carbide has a particle size of 1.0-2.5 μm.

[0009] Component B is an amine curing agent.

[0010] Preferably, by weight, component A comprises 15-35 parts of silicone-modified epoxy resin, 5-10 parts of reactive diluent, 20-50 parts of dehydration-to-char catalyst, 3-10 parts of foaming agent, 5-10 parts of flame retardant, 0.1-0.5 parts of expanded graphite, 5-10 parts of refractory fiber, and 3-15 parts of radiation-resistant filler; more preferably, by weight, component A comprises 20-30 parts of silicone-modified epoxy resin, 5-9 parts of reactive diluent, 25-48 parts of dehydration-to-char catalyst, 5-8 parts of foaming agent, 5-8 parts of flame retardant, 0.1-0.5 parts of expanded graphite, 6-8 parts of refractory fiber, and 5-15 parts of radiation-resistant filler.

[0011] Preferably, the barium sulfate has a particle size of 50-150 nm and the boron carbide has a particle size of 1.0-1.5 μm.

[0012] Preferably, the mass ratio of barium sulfate to boron carbide is 2-8:1.

[0013] Preferably, the preparation method of the silane coupling agent modified barium sulfate and boron carbide is as follows: barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred at 6000-8000 rpm for 5-20 min, and then dried to obtain silane coupling agent KH550 modified barium sulfate; boron carbide is mixed with silane coupling agent KH560 and ethanol, stirred at 5000-7000 rpm for 10-25 min, and then dried to obtain silane coupling agent KH560 modified boron carbide; barium sulfate modified with KH550 and boron carbide modified with KH560 are mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide.

[0014] Preferably, the mass ratio of the silane coupling agent KH550 to the barium sulfate is (1-15):1.

[0015] Preferably, the mass ratio of the silane coupling agent KH560 to the boron carbide is (1-10):1.

[0016] Preferably, the active diluent is a glycidyl ether, including phenyl glycidyl ether and / or alkyl glycidyl ether.

[0017] Preferably, the flame retardant is triisobutyl phosphate.

[0018] Preferably, the foaming agent is melamine.

[0019] Preferably, the dehydration and char formation catalyst is ammonium polyphosphate and / or melamine phosphate.

[0020] Preferably, the refractory fiber includes at least one of alumina fiber, glass fiber, high silica fiber, polyamide fiber, carbon fiber, and basalt fiber.

[0021] Preferably, component A further includes additives, including but not limited to dispersants, defoamers, leveling agents, and anti-settling agents. The additives are present in 0.1-2 parts by weight.

[0022] Preferably, component A further includes pigments and fillers, which can be selected from black iron oxide black, chrome iron black, manganese dioxide, white titanium dioxide (titanium dioxide), and green chromium oxide green. The specific selection can be based on the decorative effect of the coating. The pigments and fillers are 1-6 parts by weight.

[0023] Preferably, component B includes, but is not limited to, aliphatic amines and aromatic amines, specifically selected from ethylenediamine, m-phenylenediamine, diethylenetriamine, triethylenetetramine, phenolic amine, 1,3-cyclohexanedimethylamine, etc.

[0024] Preferably, the mass ratio of component A to component B is (7-10):1.

[0025] The present invention also provides a method for preparing a radiation-resistant fire-retardant coating.

[0026] Specifically, a method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0027] Barium sulfate was mixed with silane coupling agent KH550 and ethanol, stirred, and dried to obtain barium sulfate modified with silane coupling agent KH550. Boron carbide was mixed with silane coupling agent KH560 and ethanol, stirred, and dried to obtain boron carbide modified with silane coupling agent KH560. Barium sulfate modified with KH550 and boron carbide modified with KH560 were mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler.

[0028] The silicone-modified epoxy resin and reactive diluent were mixed, and then the obtained radiation-resistant filler and the remaining components were added, mixed, and ground to obtain component A.

[0029] Take an amine curing agent to prepare component B.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) This invention uses barium sulfate with a particle size of 50-150nm and boron carbide with a particle size of 1.0-1.5μm as radiation-resistant fillers. The two types of barium sulfate and boron carbide radiation-resistant filler particles with different particle sizes are coupled to form a dense structure. At the same time, the synergistic effect of micro and nano particles is brought into play, which effectively enhances the coating's radiation resistance, fire resistance and radiation resistance performance, and significantly improves the uniformity of the coating's radiation resistance performance and its fire resistance performance after radiation.

[0032] (2) In this invention, hydroxyl silane coupling agent KH550 is used to pretreat the surface of nano-barium sulfate, and epoxy silane coupling agent KH560 is used to pretreat the surface of micron-sized boron carbide. On the one hand, the surface pretreatment with silane coupling agent can improve the compatibility and dispersion uniformity between radiation-resistant fillers and between them and components such as resin. On the other hand, the hydroxyl groups in silane coupling agent KH550 can undergo ring-opening reaction with the epoxy groups in organosilicon-modified epoxy resin, and the epoxy groups in silane coupling agent KH560 can react with the amino groups in amine curing agents. This improves the dispersion and bonding force between radiation-resistant fillers and components such as matrix resin, enhances the uniformity and stability of the coating, significantly improves the uniformity of the coating's radiation protection performance and its fire resistance performance after radiation, and prevents local bubbles and delamination. Detailed Implementation

[0033] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0034] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods.

[0035] Example 1

[0036] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0037] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 8.5 parts KH550-modified barium sulfate and 3 parts KH560-modified boron carbide, with barium sulfate having a particle size of 100 nm and boron carbide having a particle size of 1.2 μm.

[0038] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0039] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0040] Step 1: Barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred at 7000 rpm for 15 min, and then dried to obtain barium sulfate modified with silane coupling agent KH550. Boron carbide is mixed with silane coupling agent KH560 and ethanol, stirred at 6000 rpm for 10 min, and then dried to obtain boron carbide modified with silane coupling agent KH560. Barium sulfate modified with KH550 and boron carbide modified with KH560 are mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler. The mass ratio of silane coupling agent KH550 to barium sulfate is 5:1, and the mass ratio of silane coupling agent KH560 to boron carbide is 4:1.

[0041] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0042] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0043] Comparative Example 1: Barium sulfate modified with KH550 only

[0044] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0045] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 11.5 parts KH550 modified barium sulfate, with a barium sulfate particle size of 100 nm.

[0046] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0047] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0048] Step 1: Barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred at 7000 rpm for 15 min, and then dried to obtain barium sulfate radiation-resistant filler modified with silane coupling agent KH550; wherein the mass ratio of silane coupling agent KH550 to barium sulfate is 5:1.

[0049] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0050] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0051] Comparative Example 2: Boron carbide modified with KH560 only

[0052] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0053] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 11.5 parts KH560 modified boron carbide with a particle size of 1.2 μm.

[0054] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0055] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0056] Step 1: Mix boron carbide with silane coupling agent KH560 and ethanol, stir at 6000 rpm for 10 min, and then dry to obtain boron carbide modified with silane coupling agent KH560, wherein the mass ratio of silane coupling agent KH560 to boron carbide is 4:1.

[0057] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0058] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0059] Comparative Example 3: Barium sulfate is nanoscale

[0060] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0061] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 8.5 parts KH550 modified barium sulfate and 3 parts KH560 modified boron carbide, the barium sulfate particle size is 100nm, and the boron carbide particle size is 100nm.

[0062] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0063] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0064] Step 1: Barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred at 7000 rpm for 15 min, and then dried to obtain barium sulfate modified with silane coupling agent KH550. Boron carbide is mixed with silane coupling agent KH560 and ethanol, stirred at 6000 rpm for 10 min, and then dried to obtain boron carbide modified with silane coupling agent KH560. Barium sulfate modified with KH550 and boron carbide modified with KH560 are mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler. The mass ratio of silane coupling agent KH550 to barium sulfate is 5:1, and the mass ratio of silane coupling agent KH560 to boron carbide is 4:1.

[0065] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0066] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0067] Comparative Example 4: Boron carbide at the micrometer scale

[0068] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0069] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 8.5 parts KH550 modified barium sulfate and 3 parts KH560 modified boron carbide, the barium sulfate particle size is 1.2 μm, and the boron carbide particle size is 1.2 μm.

[0070] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0071] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0072] Step 1: Barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred at 7000 rpm for 15 min, and then dried to obtain barium sulfate modified with silane coupling agent KH550. Boron carbide is mixed with silane coupling agent KH560 and ethanol, stirred at 6000 rpm for 10 min, and then dried to obtain boron carbide modified with silane coupling agent KH560. Barium sulfate modified with KH550 and boron carbide modified with KH560 are mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler. The mass ratio of silane coupling agent KH550 to barium sulfate is 5:1, and the mass ratio of silane coupling agent KH560 to boron carbide is 4:1.

[0073] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0074] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0075] Comparative Example 5: Modification with Vinylsilane Coupling Agent A171

[0076] A radiation-resistant fire-retardant coating comprises component A and component B, wherein the mass ratio of component A to component B is 9:1.

[0077] Component A: 25 parts silicone-modified epoxy resin (TY-H26), 7 parts C12-14 alkyl glycidyl ether, 30 parts ammonium polyphosphate, 6 parts melamine, 6.5 parts triisobutyl phosphate, 0.1 parts expanded graphite (200-400 mesh), 7.5 parts alumina fiber, 11.5 parts radiation-resistant filler, 5 parts titanium dioxide; the radiation-resistant filler is 8.5 parts A171-modified barium sulfate and 3 parts A171-modified boron carbide, the barium sulfate particle size is 100nm, and the boron carbide particle size is 1.2μm.

[0078] Component B: consists of 1,3-cyclohexanedimethylamine and phenolic amine in a mass ratio of 5.5:4.5.

[0079] A method for preparing a radiation-resistant fire-retardant coating includes the following steps:

[0080] Step 1: Barium sulfate is mixed with silane coupling agent A171 and ethanol, stirred at 7000 rpm for 15 min, and then dried to obtain barium sulfate modified with silane coupling agent A171. Boron carbide is mixed with silane coupling agent A171 and ethanol, stirred at 6000 rpm for 10 min, and then dried to obtain boron carbide modified with silane coupling agent A171. The barium sulfate modified with A171 and the boron carbide modified with A171 are mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler. The mass ratio of silane coupling agent A171 to barium sulfate is 5:1, and the mass ratio of silane coupling agent A171 to boron carbide is 4:1.

[0081] Step 2: Mix the silicone-modified epoxy resin and C12-14 alkyl glycidyl ether, then add the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber and titanium dioxide prepared in Step 1, mix and grind to obtain Component A.

[0082] Take 1,3-cyclohexanedimethylamine and phenolic amine, mix them, and obtain component B.

[0083] Product effectiveness test

[0084] The radiation-resistant fire-retardant coatings prepared in Example 1 and Comparative Examples 1-5 were subjected to performance tests. Specific test indicators included physicochemical properties (referencing GB14907-2018 Fire-retardant Coatings for Steel Structures), radiation resistance (procedure a of NB / T20133.3), and fire resistance after radiation (procedure a of NB / T20133.3 and GB 14907-2018). The test results are shown in Tables 1, 2, and 3.

[0085] Table 1 Physicochemical properties of the examples

[0086]

[0087]

[0088] Table 2 Radiation resistance and fire resistance after radiation irradiation

[0089]

[0090] As shown in Tables 1 and 2, the radiation-resistant fire-retardant coating provided in the embodiments of the present invention is uniform, fine, thick, and fluid, without lumps, with a fire resistance limit exceeding 3 hours and a cumulative radiation dose greater than 1.0 × 10⁻⁶. 7 Gy, up to 1.57 × 10 7 Gy, cumulative dose 1×10 7 After the Gy test, the coating showed no delamination, foaming, or peeling, and the thermal insulation efficiency decreased by less than 20% after irradiation, as low as 15.4%.

[0091] A comparison of Example 1 with Comparative Examples 1, 2, 3, and 4 shows that the coating obtained in Example 1 has a shorter surface drying time, a higher fire resistance limit, a higher cumulative radiation dose, and a lower attenuation of heat insulation efficiency after irradiation. This may be because Example 1 uses nano-barium sulfate and micron-sized boron carbide as radiation-resistant fillers. The nano-barium sulfate and micron-sized boron carbide radiation-resistant filler particles are coupled to form a dense structure, while the synergistic effect of micro and nano particles is utilized to effectively exert fireproof and radiation-resistant properties. This significantly improves the uniformity of the radiation protection performance and the fire resistance performance after irradiation, and prevents local bubbles and delamination.

[0092] A comparison of Example 1 and Comparative Example 5 shows that the coating obtained in Example 1 has a shorter surface drying time, a higher fire resistance limit, a higher cumulative radiation dose, and a lower decrease in thermal insulation efficiency after irradiation. This may be because Example 1 uses hydroxyl silane coupling agent KH550 for surface pretreatment of nano-barium sulfate and epoxy silane coupling agent KH560 for surface pretreatment of micron-sized boron carbide. On the one hand, surface pretreatment with silane coupling agents can improve the surface polarity of the radiation-resistant filler and improve the phase relationship between the radiation-resistant filler and the resin. On the one hand, the hydroxyl groups in silane coupling agent KH550 can improve the bonding force between the radiation-resistant filler and the matrix resin by undergoing a ring-opening reaction with the epoxy groups in the organosilicon-modified epoxy resin. On the other hand, the epoxy groups in silane coupling agent KH560 can improve the dispersibility and bonding force between the radiation-resistant filler and the coating components by reacting with the amino groups in component B. This can improve the uniformity and stability of the coating, significantly enhance the uniformity of the coating's radiation protection performance and its fire resistance after radiation, and prevent local bubbles and delamination.

[0093] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A radiation-resistant fire-retardant coating, characterized in that, The product comprises component A and component B. By weight, component A includes 15-35 parts of silicone-modified epoxy resin, 5-10 parts of reactive diluent, 20-50 parts of dehydration and charring catalyst, 3-10 parts of foaming agent, 5-10 parts of flame retardant, 0.1-0.5 parts of expanded graphite, 5-10 parts of refractory fiber, and 3-15 parts of radiation-resistant filler. The radiation-resistant filler includes barium sulfate modified with silane coupling agent and boron carbide. The barium sulfate has a particle size of 50-150 nm, and the boron carbide has a particle size of 1.0-1.5 μm. The mass ratio of silane coupling agent KH550 to barium sulfate is (1-15):1, and the mass ratio of silane coupling agent KH560 to boron carbide is (1-10):

1. Component B is an amine curing agent.

2. The radiation-resistant fire-retardant coating according to claim 1, characterized in that, Component A comprises 20-30 parts of silicone-modified epoxy resin, 5-9 parts of reactive diluent, 25-48 parts of dehydration and charring catalyst, 5-8 parts of foaming agent, 5-8 parts of flame retardant, 0.1-0.5 parts of expanded graphite, 6-8 parts of refractory fiber, and 5-15 parts of radiation-resistant filler.

3. The radiation-resistant fire-retardant coating according to claim 1 or 2, characterized in that, The mass ratio of barium sulfate to boron carbide is 2-8:

1.

4. The radiation-resistant fire-retardant coating according to claim 1 or 2, characterized in that, The method for preparing the radiation-resistant filler is as follows: barium sulfate is mixed with silane coupling agent KH550 and ethanol, stirred, and dried to obtain barium sulfate modified with silane coupling agent KH550; boron carbide is mixed with silane coupling agent KH560 and ethanol, stirred, and dried to obtain boron carbide modified with silane coupling agent KH560; barium sulfate modified with KH550 and boron carbide modified with KH560 are mixed and stirred to obtain radiation-resistant filler of barium sulfate and boron carbide modified with silane coupling agent.

5. The radiation-resistant fire-retardant coating according to claim 1 or 2, characterized in that, The active diluent is glycidyl ether, including phenyl glycidyl ether and / or alkyl glycidyl ether; the flame retardant is triisobutyl phosphate; the foaming agent is melamine; the dehydration and charring catalyst is ammonium polyphosphate and / or melamine phosphate; the refractory fiber includes at least one of alumina fiber, glass fiber, high silica fiber, polyamide fiber, carbon fiber, and basalt fiber.

6. The radiation-resistant fire-retardant coating according to claim 1 or 2, characterized in that, Component A further includes additives and pigments / fillers; the additives include at least one of dispersants, defoamers, leveling agents, and anti-settling agents; the pigments / fillers include at least one of iron oxide black, chrome iron black, manganese dioxide, titanium dioxide, and chromium oxide green.

7. The method for preparing the radiation-resistant fire-retardant coating according to any one of claims 1-6, characterized in that, Includes the following steps: Barium sulfate was mixed with silane coupling agent KH550 and ethanol, stirred, and dried to obtain barium sulfate modified with silane coupling agent KH550. Boron carbide was mixed with silane coupling agent KH560 and ethanol, stirred, and dried to obtain boron carbide modified with silane coupling agent KH560. Barium sulfate modified with KH550 and boron carbide modified with KH560 were mixed and stirred to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler. The silicone-modified epoxy resin and reactive diluent were mixed, and then the obtained radiation-resistant filler and the remaining components were added, mixed, and ground to obtain component A. Take an amine curing agent to prepare component B.

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