Radiation-resistant fireproof coating and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to an irradiation-resistant fireproof coating and a preparation method thereof. The radiation-resistant fireproof coating comprises a component A and a component B. The component A comprises, by weight, 15-35 parts of organosilicon modified epoxy resin, 5-10 parts of an active diluent, 20-50 parts of a dehydration char-forming catalyst, 3-10 parts of a foaming agent, 5-10 parts of a flame retardant, 0.1-0.5 part of expanded graphite, 5-10 parts of refractory fibers and 3-15 parts of a radiation-resistant filler. The radiation-resistant filler comprises silane coupling agent modified nano barium sulfate and micron boron carbide; and the component B is an amine curing agent. According to the radiation-resistant fireproof coating and the preparation method thereof, by adopting the specific silane coupling agent modified micro-nano radiation-resistant filler, the radiation-proof performance uniformity and the fire resistance after radiation resistance of the coating are effectively improved, and the radiation-resistant fireproof coating can be widely applied to nuclear power plants and various nuclear industry facilities.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a radiation-resistant fireproof coating and a preparation method thereof. Background Art

[0002] Radiation-resistant fire-retardant coating is a special coating that has both fire-resistant properties and the ability to withstand radiation environments. This coating has important applications in some special places, such as nuclear facilities and radioactive laboratories.

[0003] Steel structure fire retardant coatings include two types: expandable and non-expandable. When the expandable fire retardant coating is exposed to fire and heat, the carbonizer is esterified and dehydrated into carbon under the action of the catalyst. The carbide forms a closed three-dimensional honeycomb carbonized layer under the action of the inert gas decomposed by the foaming agent. The carbonized layer can seal the protected substrate and prevent gas diffusion, while preventing external oxygen from diffusing to the surface of the substrate, thereby achieving the purpose of fire prevention and heat insulation.

[0004] The current steel structure intumescent fire retardant coatings are composed of organic and inorganic base materials, fire retardant additives, catalysts, foaming agents, etc., and have good fireproof and flame retardant properties. However, the radiation-resistant fire retardant coatings currently prepared often have problems such as uneven radiation resistance of the coating, poor fire resistance after radiation, and serious attenuation of thermal insulation efficiency.

[0005] Therefore, there is an urgent need to provide a radiation-resistant fire-retardant coating with excellent performance, which can improve the uniformity of the radiation protection performance of the coating and the fire resistance after radiation. Summary of the invention

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

[0007] The invention provides a radiation-resistant fireproof coating.

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

[0009] The B component is an amine curing agent.

[0010] Preferably, in parts by weight, the component A comprises 15-35 parts of organosilicon-modified epoxy resin, 5-10 parts of active diluent, 20-50 parts of dehydration carbonization 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; further preferably, in parts by weight, the component A comprises 20-30 parts of organosilicon-modified epoxy resin, 5-9 parts of active diluent, 25-48 parts of dehydration carbonization 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 particle size is 50-150 nm, and the boron carbide particle size is 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 barium sulfate modified by silane coupling agent KH550; 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 boron carbide modified by silane coupling agent KH560; barium sulfate modified by KH550 and boron carbide modified by KH560 are mixed and stirred to obtain barium sulfate and boron carbide modified by silane coupling agent.

[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 reactive 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 carbonization 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, the component A further comprises an auxiliary agent, which includes but is not limited to a dispersant, a defoamer, a leveling agent, an anti-settling agent, etc. In parts by weight, the auxiliary agent is 0.1-2 parts.

[0022] Preferably, the component A also includes pigments and fillers, which can be selected from black iron oxide black, chromium 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, the B component includes but is not limited to aliphatic amines and aromatic amines, and is specifically selected from ethylenediamine, m-phenylenediamine, diethylenetriamine, triethylenetetramine, phenolic amine, 1,3-cyclohexanedimethylamine, and the like.

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

[0025] The invention also provides a method for preparing the radiation-resistant fireproof coating.

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

[0027] Mix barium sulfate with silane coupling agent KH550 and ethanol, stir, and dry to obtain barium sulfate modified by silane coupling agent KH550; mix boron carbide with silane coupling agent KH560 and ethanol, stir, and dry to obtain boron carbide modified by silane coupling agent KH560; mix and stir barium sulfate modified by KH550 and boron carbide modified by KH560 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler;

[0028] The organosilicon-modified epoxy resin and the active diluent are mixed, and then the obtained radiation-resistant filler and the remaining components are 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 present invention has the following beneficial effects:

[0031] (1) The present 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 barium sulfate and boron carbide radiation-resistant filler particles with two different particle sizes are coupled with each other to form a dense structure. At the same time, the synergistic effect of micro-nano particles is exerted to effectively exert the enhancement, fireproof and radiation-resistant properties, so that the uniformity of the radiation protection performance and the fire resistance after radiation resistance of the coating are significantly improved.

[0032] (2) The present invention uses hydroxy silane coupling agent KH550 to perform surface pretreatment on nano-barium sulfate, and uses epoxy silane coupling agent KH560 to perform surface pretreatment on micron 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 resins. On the other hand, the hydroxyl group in silane coupling agent KH550 can undergo a ring-opening reaction with the epoxy group in silicone-modified epoxy resin, and the epoxy group in silane coupling agent KH560 can react with the amino group of amine curing agent, thereby improving the dispersibility and bonding force between the radiation-resistant filler and components such as matrix resin, improving the uniformity and stability of the coating, and significantly improving the uniformity of the radiation protection performance and the fire resistance after radiation resistance of the coating, without the occurrence of local bubbles and delamination. DETAILED DESCRIPTION

[0033] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

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

[0035] Example 1

[0036] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

[0040] Step 1: Mix barium sulfate with silane coupling agent KH550 and ethanol, stir at 7000rpm for 15min, and then dry to obtain barium sulfate modified by silane coupling agent KH550; mix boron carbide with silane coupling agent KH560 and ethanol, stir at 6000rpm for 10min, and then dry to obtain boron carbide modified by silane coupling agent KH560; mix and stir barium sulfate modified by KH550 and boron carbide modified by KH560 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler; wherein the mass ratio of the silane coupling agent KH550 to the barium sulfate is 5:1, and the mass ratio of the silane coupling agent KH560 to the boron carbide is 4:1.

[0041] Step 2: Mix the organosilicon-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 phenalkamine, mix them, and prepare component B.

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

[0044] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

[0048] Step 1: Mix barium sulfate, silane coupling agent KH550 and ethanol, stir at 7000 rpm for 15 minutes, and then dry to obtain barium sulfate radiation-resistant filler modified by silane coupling agent KH550; wherein the mass ratio of the silane coupling agent KH550 to the barium sulfate is 5:1.

[0049] Step 2: Mix the organosilicon-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 phenalkamine, mix them, and prepare component B.

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

[0052] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

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

[0057] Step 2: Mix the organosilicon-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 phenalkamine, mix them, and prepare component B.

[0059] Comparative Example 3 Barium sulfate is nanometer-sized

[0060] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

[0064] Step 1, mixing barium sulfate with silane coupling agent KH550 and ethanol, stirring at 7000rpm for 15min, and drying to obtain barium sulfate modified by silane coupling agent KH550, mixing boron carbide with silane coupling agent KH560 and ethanol, stirring at 6000rpm for 10min, and drying to obtain boron carbide modified by silane coupling agent KH560, mixing and stirring barium sulfate modified by KH550 and boron carbide modified by KH560 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler; wherein the mass ratio of the silane coupling agent KH550 to the barium sulfate is 5:1, and the mass ratio of the silane coupling agent KH560 to the boron carbide is 4:1.

[0065] Step 2, mixing an organosilicon-modified epoxy resin and a C12-14 alkyl glycidyl ether, and then adding the radiation-resistant filler, ammonium polyphosphate, melamine, triisobutyl phosphate, expanded graphite, alumina fiber, and titanium dioxide prepared in step 1, mixing, and grinding to obtain component A;

[0066] Take 1,3-cyclohexanedimethylamine and phenalkamine, mix them, and prepare component B.

[0067] Comparative Example 4 Boron carbide is micron-sized

[0068] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

[0072] Step 1: Mix barium sulfate with silane coupling agent KH550 and ethanol, stir at 7000rpm for 15min, and then dry to obtain barium sulfate modified by silane coupling agent KH550; mix boron carbide with silane coupling agent KH560 and ethanol, stir at 6000rpm for 10min, and then dry to obtain boron carbide modified by silane coupling agent KH560; mix and stir barium sulfate modified by KH550 and boron carbide modified by KH560 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler; wherein the mass ratio of the silane coupling agent KH550 to the barium sulfate is 5:1, and the mass ratio of the silane coupling agent KH560 to the boron carbide is 4:1.

[0073] Step 2: Mix the organosilicon-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 phenalkamine, mix them, and prepare component B.

[0075] Comparative Example 5: Modification of vinyl silane coupling agent A171

[0076] A radiation-resistant fireproof coating comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 9:1;

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

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

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

[0080] Step 1: Mix barium sulfate with silane coupling agent A171 and ethanol, stir at 7000 rpm for 15 minutes, and then dry to obtain barium sulfate modified by silane coupling agent A171; mix boron carbide with silane coupling agent A171 and ethanol, stir at 6000 rpm for 10 minutes, and then dry to obtain boron carbide modified by silane coupling agent A171; mix and stir the barium sulfate modified by A171 and the boron carbide modified by A171 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler; wherein the mass ratio of the silane coupling agent A171 to the barium sulfate is 5:1, and the mass ratio of the silane coupling agent A171 to the boron carbide is 4:1.

[0081] Step 2: Mix the organosilicon-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 phenalkamine, mix them, and prepare component B.

[0083] Product effect testing

[0084] The radiation-resistant fire retardant coatings prepared in Example 1 and Comparative Examples 1-5 were subjected to performance tests, and specific test indicators included physical and chemical performance items (refer to GB14907-2018 steel structure fire retardant coatings), radiation resistance (procedure a of NB / T20133.3), and fire resistance after radiation resistance (procedure a of NB / T20133.3 and GB 14907-2018). The test results are shown in Table 1, Table 2, and Table 3.

[0085] Table 1 Physical and chemical properties of the examples

[0086]

[0087]

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

[0089]

[0090] It can be seen from Tables 1 and 2 that the radiation-resistant fire-retardant coating provided by the embodiment of the present invention is uniform and fine, thick and fluid, without agglomeration, with a fire resistance limit of more than 3h and a cumulative radiation resistance dose of more than 1.0×10 7 Gy, up to 1.57 × 10 7 Gy, cumulative dose 1×10 7 After the irradiation test, the coating showed no delamination, bubbling or shedding, and the thermal insulation efficiency attenuation after irradiation was less than 20%, as low as 15.4%.

[0091] From the comparison between Example 1 and Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4, it can be seen that the coating obtained in Example 1 has a lower surface drying time, a higher fire resistance limit, a higher cumulative radiation resistance dose and a lower thermal insulation efficiency attenuation after irradiation. This may be because Example 1 uses nano-barium sulfate and micron boron carbide as radiation-resistant fillers, and the nano-barium sulfate and micron boron carbide radiation-resistant filler particles are coupled with each other to form a dense structure, while the synergistic effect of micro-nano particles is exerted to effectively exert the fireproof and radiation-resistant properties, so that the uniformity of the radiation protection performance and the fire resistance performance after irradiation of the coating are significantly improved, and no local bubbles or delamination will occur.

[0092] From the comparison between Example 1 and Comparative Example 5, it can be seen that the coating obtained in Example 1 has a lower surface drying time, a higher fire resistance limit, a higher cumulative radiation resistance dose and a lower thermal insulation efficiency attenuation after irradiation. This may be because in Example 1, hydroxy silane coupling agent KH550 is used to perform surface pretreatment on nano-barium sulfate, and epoxy silane coupling agent KH560 is used to perform surface pretreatment on micron boron carbide. On the one hand, the surface pretreatment with silane coupling agent 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 other hand, the hydroxyl group in the silane coupling agent KH550 can react with the epoxy group in the silicone-modified epoxy resin to produce a ring-opening reaction, thereby improving the bonding force between the radiation-resistant filler and the matrix resin. The epoxy group in the silane coupling agent KH560 can react with the amino group in component B to improve the dispersibility and bonding force between the radiation-resistant filler and the coating component, thereby improving the uniformity and stability of the coating, significantly improving the uniformity of the coating's radiation protection performance and its fire resistance after radiation, without the occurrence of local bubbles or delamination.

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A radiation-resistant fire-retardant coating, characterized in that: The invention comprises component A and component B, wherein the component A comprises, by weight, 15-35 parts of organosilicon-modified epoxy resin, 5-10 parts of active diluent, 20-50 parts of dehydration carbonization 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 comprises barium sulfate and boron carbide modified by a silane coupling agent; the particle size of the barium sulfate is 50-200 nm, and the particle size of the boron carbide is 1.0-2.5 μm; The B component is an amine curing agent.

2. The radiation resistant fire retardant coating according to claim 1, characterized in that: The component A comprises 20-30 parts of organosilicon-modified epoxy resin, 5-9 parts of active diluent, 25-48 parts of dehydration carbonization 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 barium sulfate particle size is 50-150 nm, and the boron carbide particle size is 1.0-1.5 μm.

5. The radiation-resistant fire-retardant coating according to any one of claims 1 or 2, characterized in that: The silane coupling agent is at least one of an epoxy silane coupling agent and a hydroxy silane coupling agent.

6. The radiation resistant fire retardant coating according to claim 1 or 2, characterized in that: The mass ratio of the silane coupling agent KH550 to the barium sulfate is (1-15):1, and the mass ratio of the silane coupling agent KH560 to the boron carbide is (1-10):

1.

7. The radiation resistant fire retardant coating according to claim 1 or 2, characterized in that: The preparation method of the radiation-resistant filler comprises the following steps: mixing barium sulfate with a silane coupling agent KH550 and ethanol, stirring, and drying to obtain barium sulfate modified by the silane coupling agent KH550; mixing boron carbide with a silane coupling agent KH560 and ethanol, stirring, and drying to obtain boron carbide modified by the silane coupling agent KH560; and mixing and stirring the barium sulfate modified by KH550 and the boron carbide modified by KH560 to obtain the radiation-resistant filler of barium sulfate and boron carbide modified by the silane coupling agent.

8. 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 carbonization 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.

9. The radiation resistant fire retardant coating according to claim 1 or 2, characterized in that: The component A also includes additives and pigments and fillers; the additives include at least one of a dispersant, a defoamer, a leveling agent, and an anti-settling agent; the pigments and fillers include at least one of black iron oxide, black chrome iron, manganese dioxide, titanium dioxide, and chrome oxide green.

10. The method for preparing the radiation-resistant fire-retardant coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: Mixing barium sulfate with silane coupling agent KH550 and ethanol, stirring, and drying to obtain barium sulfate modified by silane coupling agent KH550; mixing boron carbide with silane coupling agent KH560 and ethanol, stirring, and drying to obtain boron carbide modified by silane coupling agent KH560; mixing and stirring barium sulfate modified by KH550 and boron carbide modified by KH560 to obtain silane coupling agent modified barium sulfate and boron carbide radiation-resistant filler; The organosilicon-modified epoxy resin and the active diluent are mixed, and then the obtained radiation-resistant filler and the remaining components are added, mixed, and ground to obtain component A; Take an amine curing agent to prepare component B.

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