Radiation-resistant and wear-resistant resin coating and preparation method thereof

Abstract

The invention provides a radiation-resistant and wear-resistant resin coating and a preparation method thereof. The radiation-resistant and wear-resistant resin coating is obtained by mixing a component A and a component B, the component A comprises hydrogenated bisphenol A type epoxy resin, novolac epoxy resin, polyurethane modified epoxy resin, anticorrosive pigment, body filler, a flame retardant and an auxiliary agent; the component B comprises a modified alicyclic amine curing agent and a modified polyamide curing agent; the mass ratio of the component A to the component B is (5-7): 1; the anticorrosive pigment comprises boron carbide. Hydrogenated bisphenol A epoxy resin is crosslinked with a modified polyamide curing agent, novolac epoxy resin and polyurethane modified epoxy resin are crosslinked with the modified polyamide curing agent, and the polyurethane modified epoxy resin is crosslinked with a modified alicyclic amine curing agent to form a resin coating system, and boron carbide is combined to obtain the radiation-resistant and wear-resistant resin coating.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically, to a radiation-resistant and abrasion-resistant resin coating and its preparation method. Background Technology

[0002] With the rapid development of nuclear power equipment in my country, the types of nuclear power equipment are increasing, and the service environment is becoming increasingly harsh. As science and technology advance, nuclear power equipment has shifted from inland areas to coastal cities. Inland nuclear power equipment requires radiation protection, while coastal nuclear power equipment, in addition to radiation resistance, also needs to operate in a marine environment for extended periods, facing threats from salt spray, high humidity, and nuclear radiation, leading to severe corrosion. To reduce the corrosion rate of equipment, delay the corrosive effects of harsh environments such as high salt spray, high humidity, and nuclear radiation caused by sudden nuclear leaks, and meet the requirement of a 20-30 year service life, there is a need to develop a protective coating material that can meet both the radiation resistance requirements of inland areas and the wear-resistant and heavy-duty corrosion-resistant requirements of coastal areas.

[0003] Currently, radiation-resistant coatings can be classified into epoxy resins, silicones, alkyd resins, phenolic resins, polyesters, and polyurethanes, based on their film-forming materials. However, single-component polymer materials have certain defects, and their shortcomings are easily exposed after being irradiated by microscopic particle streams, exhibiting phenomena such as chalking, peeling, and cracking. Furthermore, due to the different film-forming materials, their resistance to salt spray, damp heat, and radiation varies significantly.

[0004] Patent application CN103351788A discloses a radiation-resistant and corrosion-resistant high-solids coating that combines a base and topcoat, and its preparation method. However, its radiation resistance is poor, with a radiation dose tolerance of 1.0 × 10⁻⁶. 7 Below Gy, scratch and salt spray resistance were only tested up to 2000h for the coating performance, and the coating abrasion resistance (1000r / 1000g) showed a weight loss greater than 105mg. Patent application number 202311484843.9 discloses a phenolic epoxy resin composition and its preparation method, a neutron shielding material, and a spent fuel transport container. Using a phenolic epoxy resin with a specific structure as the matrix, neutron absorbers, aromatic amine curing agents, and flame retardants are added to obtain a resin composition with good shielding performance and heat resistance. However, its resistance to γ-ray dose is 750KGy, making it unsuitable as a coating for nuclear power equipment. Summary of the Invention

[0005] The problem solved by this invention is that the radiation resistance, salt spray resistance, corrosion resistance and wear resistance of existing coatings are gradually failing to meet the protection requirements of nuclear power equipment. This invention uses a multi-type resin compounded with a cross-linking multi-structure curing agent, combined with boron carbide to form a resin film with high wear resistance, radiation resistance and corrosion resistance, to obtain a radiation-resistant and wear-resistant resin coating.

[0006] To address the aforementioned problems, this invention provides a radiation-resistant and wear-resistant resin coating, wherein the radiation-resistant and wear-resistant resin coating is prepared by mixing component A and component B in a mass ratio of (5~7):1; by mass percentage, component A comprises: 5~15% hydrogenated bisphenol A type epoxy resin, 5~15% phenolic epoxy resin, 8~15% polyurethane modified epoxy resin, 10~20% anti-corrosion pigment, 14~25% extender filler, 13~25% flame retardant, and 14~25% additives, wherein the anti-corrosion pigment includes boron carbide; component B comprises: 35~55% modified cycloaliphatic amine curing agent and 45~65% modified polyamide curing agent.

[0007] This invention enhances the aging resistance of the coating by introducing a cross-linked aging-resistant resin film formed by hydrogenated bisphenol A type epoxy resin and modified polyamide curing agent into the coating system material; enhances the radiation resistance and heat aging resistance of the coating material by introducing a heat-resistant and tough resin film formed by phenolic epoxy resin, polyurethane modified epoxy resin and modified polyamide curing agent; and enhances the wear resistance of the coating by introducing polyurethane modified epoxy resin and modified alicyclic amine curing agent for cross-linking and curing.

[0008] In addition, boron carbide contains B -10 Isotopes can efficiently absorb neutrons and gamma rays, reducing radiation damage to the resin cross-linking structure; as an inert inorganic filler, it can form a multi-layer barrier structure with extender fillers, enhancing corrosion resistance; and with a Mohs hardness of up to 9.3, it is uniformly dispersed in the resin matrix to further improve wear resistance, and together with the resin cross-linking system, it yields a radiation-resistant and wear-resistant resin coating.

[0009] Furthermore, by mass percentage, component A comprises: 8-12% hydrogenated bisphenol A type epoxy resin, 8-12% phenolic epoxy resin, 10-15% polyurethane modified epoxy resin, 15-20% anti-corrosion pigment, 15-20% extender filler, 15-25% flame retardant, and 14-25% additives; component B comprises: 45-55% modified cycloaliphatic amine curing agent and 45-55% modified polyamide curing agent.

[0010] The hydrogenated bisphenol A type epoxy resin contained in this invention has a highly stable saturated cycloalkyl group in its molecular structure. After crosslinking with the modified polyamide curing agent, it forms a dense three-dimensional network structure. This structure can resist the damage of the molecular chain by the external environment and improve the aging resistance of the coating. The phenolic epoxy resin has a high crosslinking density and an aromatic ring structure. The polyurethane modified epoxy resin has both a rigid skeleton and flexible segments. When the two are synergistically crosslinked with the modified polyamide curing agent, the aromatic ring structure can absorb some radiation energy, the flexible segments can relieve the internal stress generated by radiation, and the rigid skeleton can ensure the structural stability at high temperatures, thus synergistically achieving a dual improvement in radiation resistance and heat aging resistance. After the urethane groups in the polyurethane modified epoxy resin are crosslinked with the modified cycloaliphatic amine curing agent, a crosslinked network with both high strength and elasticity is formed. This network can disperse the load during the friction process, enhance the interfacial bonding force between the coating and the substrate, and prevent detachment caused by friction.

[0011] In this invention, by mass percentage, component A preferably consists of 5.0-15.0% hydrogenated bisphenol A type epoxy resin, 5.0-15.0% phenolic epoxy resin, 10.0-15.0% polyurethane modified epoxy resin, 10.0-20.0% anti-corrosion pigment, 15.0-25.0% extender filler, 15.0-25.0% flame retardant, 10.0-15.0% diluent, 0.5-1.0% defoamer, 0.5-1.0% leveling agent, 0.5-1.0% dispersant, and 3.0-5.0% thixotropic agent.

[0012] In this invention, by mass percentage, component B preferably consists of 35-55% modified alicyclic amine curing agent and 45-65% modified polyamide curing agent.

[0013] This invention limits the mass percentage of each substance in components A and B to ensure optimal crosslinking density, filler dispersibility, and additive efficiency in resin coatings.

[0014] Furthermore, the additives include at least two of the following: diluents, defoamers, leveling agents, dispersants, and thixotropic agents. In this invention, the additives primarily meet the needs of coating production and application, optimizing coating quality.

[0015] In this invention, preferably, the mass ratio of the diluent, defoamer, leveling agent, dispersant, and thixotropic agent is 10.0~15.0:0~1.0%:0~1.0%:0~1.0%:0~5.0%; more preferably, the mass ratio of the diluent:defoamer:leveling agent:dispersant:thixotropic agent is 10.0~15.0:0.5~1.0%:0.5~1.0%:0.5~1.0%:3.0~5.0%.

[0016] Furthermore, the anti-corrosion pigment also includes iron oxide red and / or titanium dioxide, wherein the mass fraction of boron carbide is 25-50%.

[0017] This setup utilizes iron oxide red and titanium dioxide to adjust the coating color, meeting the aesthetic requirements of industrial equipment. Meanwhile, the high hiding power of titanium dioxide reduces the impact of the substrate's base color on the coating, improving its appearance. Iron oxide red also has anti-rust properties, forming a protective film on the substrate surface through chemical passivation to inhibit metal corrosion. Titanium dioxide, by reflecting ultraviolet light, reduces the aging and degradation of the resin caused by ultraviolet radiation, indirectly improving the coating's weather resistance and corrosion durability.

[0018] Furthermore, the flame retardant is one or both of surface-modified aluminum hydroxide or polyvinyl butyral.

[0019] The flame retardant is incorporated into this invention to prevent the spread of coating energy under high temperature or radiation conditions.

[0020] Furthermore, the filler material includes at least three of the following: mica powder, kaolin, nano-calcium carbonate, talc powder, and precipitated barium sulfate.

[0021] This invention enhances coating performance by adding extender pigments, which allow flake-like (mica powder, kaolin) or granular (nano-calcium carbonate, precipitated barium sulfate) pigments to synergistically form a multi-layered, dense structure with boron carbide.

[0022] Furthermore, the diluent includes at least two of xylene, n-butanol, butyl acetate, cyclohexanone, or propylene glycol methyl ether acetate; the defoamer is an organosilicon polymer; the dispersant is BYK110; and the leveling agent is an organosilicon surface additive.

[0023] The present invention includes a diluent to adjust the viscosity of the coating and adapt it to application methods such as brushing, rolling, and spraying; a defoamer to eliminate air bubbles generated during the production and application of the coating and prevent the formation of pores; a dispersant to prevent particle agglomeration; and a leveling agent to reduce surface tension.

[0024] In this invention, the diluent is preferably a mixture of xylene and cyclohexanone, or a mixture of xylene and n-butanol; the defoamer is preferably BYK530A; and the leveling agent is preferably BYK320.

[0025] Furthermore, the thixotropic agent includes one or both of fumed silica and organobentonite.

[0026] The thixotropic agent in this invention is used to adjust the rheological properties of the coating and facilitate application.

[0027] Furthermore, the radiation-resistant and wear-resistant resin coating is applied to the substrate surface and allowed to dry completely to obtain a coating layer; the coating has a radiation resistance dose ≥1.0×10⁻⁶.7 Gy.

[0028] This invention also provides a method for preparing the radiation-resistant and wear-resistant resin coating described in the above technical solution, comprising the following steps:

[0029] Preparation of S1 and A components: Hydrogenated bisphenol A type epoxy resin, phenolic epoxy resin, polyurethane modified epoxy resin, diluent, defoamer, leveling agent and dispersant are mixed evenly to obtain resin slurry; anti-corrosion pigment, extender filler and flame retardant are added to the resin slurry by stirring, and after being dispersed evenly, thixotropic agent is added in sequence and filtered to obtain component A.

[0030] Preparation of S2 and B components: Component B can be obtained by uniformly dispersing the modified cycloaliphatic amine curing agent and the modified polyamide curing agent;

[0031] S3. Preparation of antifouling coating: Mix component A and component B in a mass ratio of (5~7):1 to obtain the radiation-resistant and wear-resistant resin coating.

[0032] In this invention, the components A and B are preferably manually stirred for 5 minutes and then mixed evenly to obtain the radiation-resistant and wear-resistant resin coating; the present invention preferably adopts brush coating, roller coating and air spraying coating methods.

[0033] The radiation-resistant and wear-resistant resin coating and its preparation method described in this invention have the following beneficial effects:

[0034] (1) This invention significantly improves the radiation resistance of the coating by synergistic crosslinking of hydrogenated bisphenol A type epoxy resin, phenolic epoxy resin, and polyurethane modified epoxy resin with modified polyamide curing agent and modified cycloaliphatic amine curing agent, respectively, combined with boron carbide filler. The radiation resistance of the coating is ≥1.0×10⁻⁶. 7 Gy, far exceeding existing similar products, and the coating has been tested at 1.0×10 7 After being irradiated with Gy and then soaked in 5% boric acid for 18 hours, there was still no blistering, cracking, or peeling, which can resist the corrosion of the extreme radiation environment of nuclear power equipment.

[0035] (2) In this invention, boron carbide forms a multi-layered, dense barrier structure with mica powder, kaolin and other fillers. The coating withstands 6100h of neutral salt spray test without cracking or peeling, and the bubbling density is zero. After 2200h of scratch salt spray test, the corrosion width at the scratch is only 2.5mm, which can meet the long-term protection requirements of coastal high salt spray and humid heat environment. In addition, the coating has excellent mechanical properties and temperature stability, which can effectively resist the impact and temperature fluctuation during equipment transportation, installation and use, and ensure long-term service reliability. Attached Figure Description

[0036] Figure 1The images shown are of the resin coating prepared in Example 2 of this invention after irradiation, wherein (a) is an image with an irradiation intensity of 1.0 × 10⁻⁶. 7 Gy, (b) represents irradiance > 1.0 × 10 7 Gy;

[0037] Figure 2 Images of the resin coating prepared in Example 2 of this invention after radiation resistance test and acid resistance test, wherein (c) is an image after 1×10 7 Gy irradiation, (d) after irradiation and soaking in 5% boric acid. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] In one embodiment of the present invention, the hydrogenated bisphenol A type epoxy resin in component A is one or both of SH-3000 or SH-7500 from Celway New Materials Co., Ltd.; the phenolic epoxy resin is one or more of Arkema A-5001, Celway New Materials Co., Ltd. TFN-51 or TFN-65; the polyurethane modified epoxy resin is one or both of EU-3000 or ECU-4500 from Celway New Materials Co., Ltd.; the modified cycloaliphatic amine curing agent in component B is one or more of Air Products and Chemicals, Inc. 2519 or 2280, and Jiangxi Baisheng Co., Ltd. BS844; the modified polyamide curing agent is Jiangxi Baisheng Co., Ltd. BS8353, but is not limited to these products; other similar products can achieve similar effects.

[0040] Example 1

[0041] Component A:

[0042] Hydrogenated bisphenol A type epoxy resin (SH-3000, 8g)

[0043] Phenolic epoxy resin (A-5001, 15g)

[0044] Polyurethane modified epoxy resin (EU-3000, 10g)

[0045] Filler material (precipitated barium sulfate, 5g; mica powder, 5g; kaolin, 5g)

[0046] Anti-corrosion pigments (iron oxide red, 10g; titanium dioxide, 5g; boron carbide, 5g)

[0047] Flame retardant (surface-modified aluminum hydroxide, 15g)

[0048] Diluents (xylene, 7.5 g; cyclohexanone, 7.5 g)

[0049] Defoamer (BYK530A, 0.5g)

[0050] Dispersant (BYK110, 0.5g)

[0051] Leveling agent (BYK320, 1.0g)

[0052] Thixotropic agent (organic bentonite, 5.0g)

[0053] Component B:

[0054] Modified cycloaliphatic amine curing agent (2519, 10g)

[0055] Modified polyamide curing agent (BS8353, 10g)

[0056] A method for preparing a radiation-resistant and abrasion-resistant resin coating, comprising:

[0057] (1) Weigh the hydrogenated bisphenol A type epoxy resin, phenolic epoxy resin, polyurethane modified epoxy resin, diluent, defoamer, leveling agent and dispersant according to the formula mass and put them into the dispersion tank. Disperse at high speed of 1500r / min for 15min to form a uniformly dispersed resin slurry.

[0058] (2) While rotating the dispersion disc at 500 r / min, add the preservative pigment, extender filler and flame retardant weighed according to the formula into the dispersed resin slurry.

[0059] (3) After adding all the fillers, disperse them at a high speed of 2000 r / min for 30 min;

[0060] (4) After testing the fineness, add the required thixotropic agent, disperse at 1500r / min for 15min, filter, and discharge. The viscous fluid is component A of this patent.

[0061] (5) Add component B to the viscous fluid prepared in (4) and stir evenly for 5 minutes to obtain the resin coating.

[0062] The obtained resin coating was applied to the surface of the substrate and, after drying, was tested for radiation resistance, salt spray resistance, and abrasion resistance. The test results are shown below.

[0063] Table 1 Performance test results of the resin coating prepared in Example 1

[0064] Serial Number Testing items Technical indicators achieved Test methods 1 Adhesion, MPa 6.13 GB / T5210-2006 2 Impact strength, cm 40 GB / T1732-1993 3 Radiation resistant, Gy <![CDATA[>1.0×10 7 The coating exhibits no peeling, cracking, delamination, powdering, or flaking. NB / T20133.3-2012 4 Neutral salt spray resistance test, MPa After 4000 hours, there were no cracks or peeling; the foaming density was zero. Adhesion was 2.53. GB / T 10125-2021 GB / T5210-2006 5 Scratch resistance and salt spray test, MPa After 1500 hours, the corrosion width at the scratch was 4.3 mm; adhesion was 2.15. GB / T 10125-2021 GB / T5210-2006 6 <![CDATA[After being irradiated with 1.0×10 7 Gy and immersed in 5% boric acid for 18 h, MPa]]> After being immersed in 5% boric acid for 18 hours, the radiation-resistant sample showed slight blistering of the coating, but no cracking or peeling, and an adhesion of 2.33. NB / T20133.3-2012NB / T20133.5-2012GB / T5210-2006 7 Temperature resistance (120±2℃) / 200h, MPa The coating showed no blistering, cracking, or peeling, with an adhesion of 5.3. GB / T1735-2009 GB / T5210-2006 8 Abrasion resistance (1000r / 1000 g), mg≤ 45 GB / T1768-2006

[0065] Example 2

[0066] Component A:

[0067] Hydrogenated bisphenol A type epoxy resin (SH-7500, 10g)

[0068] Phenolic epoxy resin (TFN-51, 10g)

[0069] Polyurethane modified epoxy resin (ECU-4500, 12g)

[0070] Filler material (precipitated barium sulfate, 5g; kaolin, 5g; nano calcium carbonate, 5g)

[0071] Anti-corrosion pigments (iron oxide red, 5g; titanium dioxide, 5g; boron carbide, 10g);

[0072] Flame retardants (surface-modified aluminum hydroxide, 7.5g; polyvinyl butyral, 7.5g)

[0073] Diluents (xylene, 7.5 g; n-butanol, 7.5 g)

[0074] Defoamer (BYK530A, 0.5g)

[0075] Dispersant (BYK110, 0.5g)

[0076] Leveling agent (BYK320, 1.0g)

[0077] Thixotropic agent (organic bentonite, 5.0g)

[0078] Component B:

[0079] Modified cycloaliphatic amine curing agent (2519, 10g)

[0080] Modified polyamide curing agent (BS8353, 10g)

[0081] The preparation method of the resin coating in this embodiment is the same as that in Example 1, except that the component dosages are adjusted according to the above formula. The obtained resin coating is applied to the surface of the substrate, and after it dries completely, radiation resistance, salt spray resistance, and abrasion resistance tests are conducted. The test results are shown below.

[0082] Table 2 Performance test results of the resin coating prepared in Example 2

[0083] Serial Number Testing items Technical indicators achieved Test methods 1 Adhesion, MPa 7.54 GB / T5210-2006 2 Impact strength, cm 50 GB / T1732-1993 3 Radiation resistant, Gy <![CDATA[>1.0×10 7 The coating exhibits no peeling, cracking, delamination, powdering, or flaking. NB / T20133.3-2012 4 Neutral salt spray resistance test, MPa After 6100 hours, there were no cracks or peeling; the foaming density was zero. Adhesion was 3.94. GB / T 10125-2021 GB / T5210-2006 5 Scratch resistance and salt spray test, MPa After 2200 hours, the corrosion width at the scratch was 2.5 mm; adhesion was 4.25. GB / T 10125-2021 GB / T5210-2006 6 <![CDATA[After being irradiated with 1.0×10 7 Gy and soaked in 5% boric acid for 18 h, MPa]]> After being immersed in 5% boric acid for 18 hours, the radiation-resistant sample showed no blistering, cracking, or peeling of the coating, with an adhesion strength of 4.29. NB / T20133.3-2012NB / T20133.5-2012GB / T5210-2006 7 Temperature resistance (120±2℃) / 200h, MPa The coating showed no blistering, cracking, or peeling, with an adhesion of 6.72. GB / T1735-2009 GB / T5210-2006 8 Abrasion resistance (1000r / 1000 g), mg≤ 26 GB / T1768-2006

[0084] The higher the nuclear irradiation energy density, the darker the coating color, indicating that the coating is effectively absorbing the irradiation energy and protecting the substrate. Figure 1 As can be seen, the sample surface is smooth and flat, without a dusty powdery layer, and without micro-cracks or pinholes, indicating that the coating prepared in Example 2 of this invention has a radiation intensity > 1.0 × 10⁻⁶. 7Even under higher radiation environments, it maintains surface integrity and stable performance, exhibiting excellent radiation resistance and meeting the protection requirements of nuclear power equipment.

[0085] from Figure 2 As can be seen from the results, the coating prepared in Example 2 of this invention showed no blistering, cracking, peeling, powdering or delamination on the surface during radiation resistance and acid resistance tests after irradiation. The edges were neat and without curling. The adhesion before and after boric acid immersion was not significantly different, and the coating could still maintain the integrity of the surface, demonstrating excellent acid and corrosion resistance.

[0086] Example 3

[0087] Component A:

[0088] Hydrogenated bisphenol A type epoxy resin (SH-3000, 10g)

[0089] Phenolic epoxy resin (TFN-65, 10g)

[0090] Polyurethane modified epoxy resin (EU-3000, 12g)

[0091] Filler material (talc, 5g; kaolin, 5g; nano calcium carbonate, 5g)

[0092] Anti-corrosion pigments (iron oxide red, 5g; titanium dioxide, 10g; boron carbide, 5g);

[0093] Flame retardant (polyvinyl butyral, 15g)

[0094] Diluents (xylene, 7.5 g; n-butanol, 7.5 g)

[0095] Defoamer (BYK530A, 0.5g)

[0096] Dispersant (BYK110, 0.5g)

[0097] Leveling agent (BYK320, 1.0g)

[0098] Thixotropic agent (organic bentonite, 5.0g)

[0099] Component B:

[0100] Modified cycloaliphatic amine curing agent (2280, 8g)

[0101] Modified polyamide curing agent (BS8353, 10g)

[0102] The preparation method of the resin coating in this embodiment is the same as that in Example 1, except that the component dosages are adjusted according to the above formula. The obtained resin coating is applied to the surface of the substrate, and after it dries completely, radiation resistance, salt spray resistance, and abrasion resistance tests are conducted. The test results are shown below.

[0103] Table 3 Performance test results of the resin coating prepared in Example 3

[0104] Serial Number Testing items Technical indicators achieved Test methods 1 Adhesion, MPa 6.42 GB / T5210-2006 2 Impact strength, cm 50 GB / T1732-1993 3 Radiation resistant, Gy <![CDATA[>1.0×10 7 The coating exhibits no peeling, cracking, delamination, powdering, or flaking. NB / T20133.3-2012 4 Neutral salt spray resistance test, MPa After 5000 hours, there were no cracks or peeling, only slight bubbles at the edges; adhesion was 3.94. GB / T 10125-2021 GB / T5210-2006 5 Scratch resistance and salt spray test, MPa After 1800 hours, the corrosion width at the scratch was 3.9 mm; adhesion was 3.13. GB / T 10125-2021 GB / T5210-2006 6 <![CDATA[After being irradiated with 1.0×10 7 Gy and soaked in 5% boric acid for 18h, MPa]]> After being immersed in 5% boric acid for 18 hours, the radiation-resistant sample showed no blistering, cracking, or peeling of the coating, with an adhesion strength of 2.34. NB / T20133.3-2012NB / T20133.5-2012GB / T5210-2006 7 Temperature resistance (120±2℃) / 200h, MPa The coating showed no blistering, cracking, or peeling, with an adhesion of 4.89. GB / T1735-2009 GB / T5210-2006 8 Abrasion resistance (1000r / 1000 g), mg≤ 35 GB / T1768-2006

[0105] As can be seen from Tables 1-3, the resin coating of the present invention has the advantages of radiation resistance, wear resistance, and heavy corrosion protection.

[0106] Comparative Example 1:

[0107] Component A:

[0108] Hydrogenated bisphenol A type epoxy resin (SH-3000, 10g)

[0109] Phenolic epoxy resin (A-5001, 10g)

[0110] Polyurethane modified epoxy resin (EU-3000, 12g)

[0111] Filler material (talc, 5g; kaolin, 5g; nano calcium carbonate, 5g)

[0112] Preservative pigments (iron oxide red, 10g; titanium dioxide, 10g)

[0113] Flame retardant (surface-modified aluminum hydroxide, 15g)

[0114] Diluents (xylene, 7.5 g; n-butanol, 7.5 g)

[0115] Defoamer (BYK530A, 0.5g)

[0116] Dispersant (BYK110, 0.5g)

[0117] Leveling agent (BYK320, 1.0g)

[0118] Thixotropic agent (organic bentonite, 5.0g)

[0119] Component B:

[0120] Modified cycloaliphatic amine curing agent (2280, 8g)

[0121] Modified polyamide curing agent (BS8353, 10g)

[0122] The preparation method of this comparative resin coating is the same as that of Example 1, except that the component dosages are adjusted according to the above formula. The obtained resin coating is applied to the surface of the substrate, and after it dries completely, radiation resistance, salt spray resistance, and abrasion resistance tests are conducted. The test results are shown below.

[0123] Table 4 Performance test results of the resin coating prepared in Comparative Example 1

[0124] Serial Number Testing items Technical indicators achieved Test methods 1 Adhesion, MPa 5.89 GB / T5210-2006 2 Impact strength, cm 50 GB / T1732-1993 3 Radiation resistant, Gy <![CDATA[>1.0×10 7 The coating exhibits peeling, cracking, and delamination. NB / T20133.3-2012 4 Neutral salt spray resistance test, MPa After 5000 hours, there were no cracks or peeling, only slight blistering at the edges; adhesion was 3.18. GB / T 10125-2021 GB / T5210-2006 5 Scratch resistance and salt spray test, MPa After 1500 hours, the corrosion width at the scratch was 5.7 mm; adhesion was 2.78. GB / T 10125-2021 GB / T5210-2006 6 <![CDATA[After being irradiated with 1.0×10 7 Gy and soaked in 5% boric acid for 18 h, MPa]]> After being immersed in 5% boric acid for 18 hours, the radiation-resistant sample exhibited peeling, cracking, and delamination of the coating, with an adhesion strength of 1.23. NB / T20133.3-2012NB / T20133.5-2012GB / T5210-2006 7 Temperature resistance (120±2℃) / 200h, MPa The post-coating layer blistered, cracked, and peeled; adhesion was 1.53 MPa. GB / T1735-2009 GB / T5210-2006 8 Abrasion resistance (1000r / 1000 g), mg≤ 68 GB / T1768-2006

[0125] As can be seen from Table 4, without the addition of boron carbide, the resin coating has a viscosity >1.0×10⁻⁶. 7 Under irradiation, the coating exhibits peeling, cracking, and delamination, with a significant decrease in radiation resistance; temperature resistance, acid resistance, salt spray resistance, and abrasion resistance all decrease to varying degrees.

[0126] Boron carbide contains B -10 Isotope, B -10 Isotopes have a strong absorption effect on gamma-ray radiation, which can reduce the aging damage of gamma rays to resin coatings; boron carbide, as an inert inorganic filler, synergistically forms a dense coating with other additives, delaying corrosion; boron carbide has a hardness close to that of diamond, and as a rigid filler, it is uniformly dispersed in the resin matrix, which can significantly improve the coating hardness, disperse friction load, and ultimately synergistically improve the radiation resistance, corrosion resistance and wear resistance of the resin coating.

[0127] The radiation-resistant and wear-resistant resin coating described in this invention meets the needs of both inland nuclear power plants for radiation resistance and coastal plants for wear resistance and heavy corrosion protection. It can meet the 20-30 year service life requirements of nuclear power equipment and is suitable for more demanding service scenarios.

[0128] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A radiation-resistant and wear-resistant resin coating, characterized in that, The radiation-resistant and wear-resistant resin coating is prepared by mixing component A and component B in a mass ratio of (5~7):1; By weight percentage, component A comprises: 5-15% hydrogenated bisphenol A type epoxy resin, 5-15% phenolic epoxy resin, 8-15% polyurethane modified epoxy resin, 10-20% anti-corrosion pigment, 14-25% extender filler, 13-25% flame retardant, and 14-25% additives, wherein the anti-corrosion pigment includes boron carbide; component B comprises: 35-55% modified cycloaliphatic amine curing agent and 45-65% modified polyamide curing agent.

2. The radiation-resistant and wear-resistant resin coating according to claim 1, characterized in that, By weight percentage, component A comprises: 8-12% hydrogenated bisphenol A type epoxy resin, 8-12% phenolic epoxy resin, 10-15% polyurethane modified epoxy resin, 15-20% anti-corrosion pigment, 15-20% extender filler, 15-25% flame retardant, and 14-25% additives; component B comprises: 45-55% modified cycloaliphatic amine curing agent and 45-55% modified polyamide curing agent.

3. The radiation-resistant and abrasion-resistant resin coating according to claim 1 or 2, characterized in that, The additives include at least two of the following: diluents, defoamers, leveling agents, dispersants, and thixotropic agents.

4. The radiation-resistant and abrasion-resistant resin coating according to claim 1 or 2, characterized in that, The anti-corrosion pigment also includes iron oxide red and / or titanium dioxide, wherein the mass fraction of boron carbide is 25-50%.

5. The radiation-resistant and abrasion-resistant resin coating according to claim 1 or 2, characterized in that, The flame retardant is one or both of surface-modified aluminum hydroxide or polyvinyl butyral.

6. The radiation-resistant and abrasion-resistant resin coating according to claim 1 or 2, characterized in that, The filler material includes at least three of the following: mica powder, kaolin, nano-calcium carbonate, talc powder, and precipitated barium sulfate.

7. The radiation-resistant and wear-resistant resin coating according to claim 3, characterized in that, The diluent includes at least two of xylene, n-butanol, butyl acetate, cyclohexanone, or propylene glycol methyl ether acetate; the defoamer is an organosilicon polymer; the dispersant is BYK110; and the leveling agent is an organosilicon surface additive.

8. The radiation-resistant and wear-resistant resin coating according to claim 3, characterized in that, The thixotropic agent includes one or both of fumed silica and organobentonite.

9. The radiation-resistant and wear-resistant resin coating according to claim 1, characterized in that, The radiation-resistant and wear-resistant resin coating is applied to the substrate surface and allowed to dry completely to obtain a coating layer; the coating has a radiation resistance dose ≥1.0×10⁻⁶. 7 Gy.

10. The method for preparing the radiation-resistant and wear-resistant resin coating according to any one of claims 1 to 9, characterized in that, Includes the following steps: Preparation of S1 and A components: Hydrogenated bisphenol A type epoxy resin, phenolic epoxy resin, polyurethane modified epoxy resin, diluent, defoamer, leveling agent and dispersant are mixed evenly to obtain resin slurry; anti-corrosion pigment, extender filler and flame retardant are added to the resin slurry by stirring, and after being dispersed evenly, thixotropic agent is added in sequence and filtered to obtain component A. Preparation of S2 and B components: Component B can be obtained by uniformly dispersing the modified cycloaliphatic amine curing agent and the modified polyamide curing agent; S3. Preparation of antifouling coating: Mix component A and component B in a mass ratio of (5~7):1 to obtain the radiation-resistant and wear-resistant resin coating.

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