CN115746685A - Double-layer special coating material suitable for removing Po-210 pollution on ground in nuclear facility and preparation method and construction method thereof - Google Patents
Double-layer special coating material suitable for removing Po-210 pollution on ground in nuclear facility and preparation method and construction method thereof Download PDFInfo
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Abstract
The invention discloses a double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility, a preparation method and a construction method thereof, wherein the double-layer special coating material comprises a seal primer and an elastic finish; the seal primer is water-based two-component epoxy resin, and the elastic finish comprises water-based polyurethane resin, nano silica sol, graphene oxide and nano silver powder. The seal primer has good sealing and shielding performance, adhesion performance and flexibility, and prevents Po-210 from penetrating into the substrate; the elastic finish paint has good adsorption function on Po-210 to realize Po-210 fixation, also has good adhesion property, service life (2-3 years) and construction performance, and is beneficial to stripping the whole double-layer coating to realize replacement.
Description
Technical Field
The invention relates to the technical field of nuclear pollution treatment, in particular to a double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility, and a preparation method and a construction method thereof.
Background
During the operation of the lead bismuth fast reactor, the lead bismuth coolant can generate the extremely toxic nuclide Po-210 under the condition of neutron irradiation. The half-life of Po-210 was 138.4 days, and the specific activity was 1.66X 10 14 Bq/g, decayed by emission of 5.30MeV alpha particles, with 0.001% emission of 0.803MeV gamma rays. According to the toxicity grouping content of radionuclide in appendix D of GB18871-2002 'basic standard for ionizing radiation protection and radiation source safety', po-210 is positioned at the second position of an extremely toxic group under the condition that various chemical poisons are equivalent. Po-210 are very volatile and upon contact with air, they form radioactive aerosols that diffuse and migrate with the unidirectional movement of the aerosol suspended particle carriers, gradually adhering to and depositing on the floor of the system space, thus forming surface radioactive contamination. In order to prevent the Po-210 aerosol migrating and diffusing in the air from depositing on the ground surface of the system space to cause pollution and avoid potential internal irradiation risks to workers due to the fact that the air flow of the space moves around to enter the system space environment again to migrate, a coating material is needed to adsorb the Po-210 diffusing on the ground, and the prior prevention is carried out by combining other decontamination measures so as to ensure the health safety of the workers and the stable operation of equipment.
It is considered that the ground surface may be a base material such as cement or concrete, and the surface thereof is uneven and has a porous structure, so that radioactive aerosols settled from the environmental space are likely to migrate and accumulate to the inner surface of the base material and are not easily removed. At present, most of nuclear radiation-resistant ground coatings used in China are epoxy coatings and polyurea coatings, and the problems of large brittleness, insufficient toughness, short pot life, difficult construction and the like mainly exist.
Disclosure of Invention
The invention aims to provide a double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility, and a preparation method and a construction method thereof.
In a first aspect, the invention discloses a double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility, which comprises a seal primer and an elastic finish;
the seal primer is water-based two-component epoxy resin, and the elastic finish comprises water-based polyurethane resin, nano silica sol, graphene oxide and nano silver powder.
The invention has the beneficial effects that:
1. the seal primer has good sealing and shielding performance, adhesion performance and flexibility, and prevents Po-210 from permeating into the base material; the elastic finish paint has good adsorption function on Po-210 to realize Po-210 fixation, also has good adhesion property, service life (2-3 years) and construction performance, and is beneficial to stripping the whole double-layer coating to realize replacement.
2. The alpha irradiation resistance and the gamma irradiation resistance are good. The coatings made of double-layer special coating materials are all subjected to more than 10 5 Gy gamma irradiation test and emissivity of alpha particles on 15cm × 10cm surface of active region of 5148s -1 The alpha irradiation test shows that key performances such as hardness, adhesive force and the like are basically unchanged, no new group is generated by infrared analysis, the thermal decomposition temperature of the coating is unchanged, the irradiation resistance of the surface coating is stable, the thermal stability is not reduced, the aging degradation phenomenon is avoided, and the method is suitable for decontamination of space ground Po-210 pollution of the lead-bismuth fast reactor system and can effectively prevent damage and aging of radiation to the coating.
3. The adhesive can be completely stripped, the sealing primer seals the ground with rough surface and micropores into the sealing primer with smooth surface, the smooth surface of the sealing primer is coated with the elastic finishing coat, the thickness of the elastic finishing coat is controlled between 150 mu m and 200 mu m, the elastic finishing coat is not easy to damage, and the whole double-layer coating can be completely stripped from the surface of the base material.
4. The pollution removal and adsorption performance on the surface Po-210 is high. The elastic adsorption coating has certain viscosity at the working condition temperature due to lower glass transition temperature, and Po-210 aerosol is adhered to the surface of the elastic adsorption coating through the effects of gas transportation, natural sedimentation and the like, and in addition, the graphene oxide and the nano silver powder with the sheet structure form a unique microstructure on the surface of the elastic adsorption coating, so that the Po-210 aerosol can be mechanically embedded or attached to the elastic adsorption coating, and the effects of adsorbing and fixing pollutants are achieved.
In a second aspect, the invention provides a preparation method of the double-layer special coating material, wherein the component A and the component B are mixed according to-NH/-COC = 0.7-0.9 to obtain a seal coat;
and uniformly mixing all the components of the elastic finish paint, and grinding to obtain the elastic finish paint.
The preparation method is simple and easy to implement, and the obtained seal primer and the elastic finish have stable performance and good storage performance.
In a third aspect, the invention provides a construction method of the double-layer special coating material, which comprises the following steps:
and coating the seal primer on the ground in the nuclear facility, curing to obtain a seal primer coating, and spraying the elastic finish on the seal primer coating.
The construction method is simple and easy to realize, and solves the problem of difficult construction of the conventional epoxy coating and polyurea coating.
The thickness of the seal primer coating is 80-100 mu m, and the thickness of the elastic finishing coat is 150-200 mu m. Can form good strippable coating, has strong strippability, realizes flexible and integral film uncovering and decontamination, is easy to replace, does not cause obvious damage to the base material, and is favorable for secondary coating.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a graph showing a water resistance test in an example of the present invention;
FIG. 2 is a 300% modulus tester view of an elastomeric topcoat in an embodiment of the invention;
FIG. 3 is a 180 peel strength test chart of an elastomeric topcoat in an embodiment of the invention;
FIG. 4 is a graph of a gamma irradiation resistance test for a dual layer specialty coating in an embodiment of the present invention;
FIG. 5 is a graph of the alpha radiation resistance test for a dual layer specialty coating in an embodiment of the present invention;
FIG. 6 is a graph of the results of an elongation test for an elastomeric topcoat in example 1 of the present invention, wherein: the 4 curves are parallel test results of 4 samples;
FIG. 7 is a graph of the tear strength test results for the elastomeric topcoat of example 1 of the present invention, wherein: the 5 curves are the parallel test results of 5 samples;
FIG. 8 is an abrasion tester used for abrasion resistance testing of elastomeric topcoats in accordance with an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
All starting materials for the present invention, without particular limitation as to their source, are either commercially available or can be prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in their purity, and analytical purity or purity requirements conventional in the art are preferably employed in the present invention.
All the raw materials, the marks and the acronyms thereof belong to the conventional marks and the acronyms in the field, each mark and acronym is clear and definite in the field of related application, and the raw materials can be purchased from the market or prepared by the conventional method by the technical staff in the field according to the marks, the acronyms and the corresponding application.
As most of the existing ground coatings for preventing nuclear radiation in the nuclear space are epoxy coatings and polyurea coatings, the problems of large brittleness, insufficient toughness, short working life, incapability of curing radioactive substances in the nuclear space, difficult construction, difficult stripping, influence on secondary coating and the like mainly exist, so that the ground coatings are not suitable for adsorption and fixation of the space ground Po-210 of the lead-bismuth fast reactor system.
The inventor finds that the adopted two-component epoxy resin has good compactness, can prevent Po-210 from permeating into a base material, has proper flexibility and adhesive force, can be used as a primer, coats an elastic finish on the primer, and can easily peel a primer film layer formed by the two-component epoxy resin under proper thickness, thereby being beneficial to secondary coating. The adsorption material formed by the nano silica sol, the graphene oxide and the nano silver powder is beneficial to adsorbing and fixing the Po-210, so that the concentration of the Po-210 in the whole core space is reduced, and the pollution to the wall in the core space is avoided.
The invention relates to a double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility, which comprises a seal primer and an elastic finish;
the seal primer is water-based two-component epoxy resin, and the elastic finish comprises water-based polyurethane resin, nano silica sol, graphene oxide and nano silver powder.
The seal primer levels the cement or concrete ground (i.e. fills the gap) and separates the cement or concrete from the elastic finish paint through the good compactness of the seal primer, so that the Po-210 adsorbed by the elastic finish paint is prevented from permeating into the cement or concrete. The elastic finishing coat mainly adsorbs and fixes Po-210, and has good tearing strength and bonding strength, so that the seal primer can be stripped together when being stripped, the integral stripping is realized, and the recoating is convenient (namely the elastic finishing coat is replaced when the adsorption capacity reaches saturation).
Wherein the aqueous two-component epoxy resin is obtained by mixing two different epoxy resins. The two different epoxy resin performances are complementary, so that the seal primer has good corrosion resistance, heat resistance and adhesive property besides good compactness, thereby having good service life and being convenient to be stripped along with the elastic finish paint.
In the present invention, the aqueous two-component epoxy resin may be, but is not limited to, a combination of bisphenol a epoxy resin and aqueous novolac epoxy resin. The bisphenol A epoxy resin has higher stability, small curing shrinkage rate and good chemical medium resistance, ether groups, benzene rings and aliphatic hydroxyl groups in high polymers are not easily corroded by acid and alkali, the electric insulation performance is excellent, the heat resistance is better, the constructability is good, the irradiation resistance is strong, but the corrosion resistance and the heat resistance of the bisphenol A epoxy resin can not meet the higher application requirements of local nuclear facilities, so that the bisphenol A epoxy resin has the function of making up for deficiencies by adding the water-based phenolic epoxy resin. Compared with bisphenol A epoxy resin, the water-based novolac epoxy resin has the biggest characteristic that the functionality of molecular epoxy groups of the water-based novolac epoxy resin is more than 2, so that the water-based novolac epoxy resin has higher crosslinking density and better corrosion resistance and heat resistance.
The properties of the coating formed by mixing the bisphenol A epoxy resin and the aqueous novolac epoxy resin are described below in detail in Table 1.
TABLE 1
As can be seen from Table 1, the properties of bisphenol A epoxy resin 128 other than gloss are significantly inferior to those of novolac epoxy resin 5003, so that by using novolac epoxy resin 5003 and bisphenol A epoxy resin 128 in combination, each property can be significantly improved to meet the requirements of different nuclear spaces. Under the condition of meeting the requirements, the specific mass of the two is preferably 3.
In the elastic finishing coat, the nano silica sol can enhance the elastic adsorption finishing coat, improve the tearing strength of the coat, ensure that the elastic adsorption finishing coat is not cracked when being stripped, can be stripped integrally at one time, is convenient to replace after reaching adsorption saturation, and ensures that the replacement is simpler and has strong operability.
The adsorption of the graphene oxide to Po depends on the type and number of oxygen-containing functional groups on the surface and a pi-pi conjugated structure of a basal plane, the adsorption force is derived from electrostatic attraction and complexation, meanwhile, the graphene oxide not only has the oxygen-containing functional groups, but also has a large surface area, so that the adsorption capacity of the graphene oxide is remarkably improved, and the loss of the adsorption capacity is reduced due to the existence of the graphene oxide, and the heterogeneity of basic sites is kept.
Under the influence of adsorption enthalpy and potential, po-210 has self-deposition characteristics on the surfaces of silver and precious metals (gold and palladium surfaces), and nano silver is introduced into the strippable decontamination coating to actively adsorb nuclide aerosol in a system space. The nano silver can be contained in a porous structure of the graphene oxide, and the adsorption force of the whole elastic finish paint on the Po-210 is enhanced by utilizing the characteristic that the nano silver actively adsorbs the Po-210 and the characteristic that the graphene oxide adsorbs the Po-210 (namely, the Po-210 can be adsorbed by the nano silver and the graphene oxide at the same time), so that the desorption condition is avoided.
The waterborne polyurethane resin has a low glass transition temperature and has certain viscosity at a working condition temperature, so that Po-210 adsorbed by the nano-silver and the graphene oxide can be adhered, the adsorption capacity of the elastic finish paint is further enhanced, desorption of the elastic finish paint from the elastic finish paint under the action of small external force is avoided, and the nano-silver, the graphene oxide and the waterborne polyurethane resin have a good synergistic effect. The waterborne polyurethane resin provides a certain elastic property for the elastic finish paint, enhances the wear resistance of the elastic finish paint and prolongs the service life of the elastic finish paint. The elastic finishing coat and the seal primer have good adhesive property through the good adhesive property of the waterborne polyurethane resin, so that the condition that the elastic finishing coat and the seal primer are separated in the using process is avoided.
In the invention, the seal coat comprises a component A and a component B, wherein the component A and the component B are mixed according to-NH/-COC = 0.7-0.9;
wherein: the component A comprises 60 to 80 weight percent of water-based bisphenol A epoxy emulsion, 15 to 25 weight percent of water-based novolac epoxy resin, 3.9 to 6.8 weight percent of seal primer assistant and the balance of water; the component B comprises 60 to 80 weight percent of waterborne polyamide curing agent and the balance of water.
The component A belongs to thermosetting coating, amine curing agent (namely component B) containing active hydrogen and capable of reacting with epoxy group in the component A must be added, the component A can be fully cured, otherwise, no performance or performance weakening exists; the amount of the B component added to the A component may be mixed in accordance with-NH/-COC =0.7 to 0.9. Therefore, the component A and the component B must be matched for use, and one of the components is not necessary.
In the invention, the seal coat assistant comprises but is not limited to 0.3wt% -0.5 wt% of a concrete wetting agent, 0.5wt% -1 wt% of a coat defoamer, 3wt% -5 wt% of a coat cosolvent and 0.1wt% -0.3 wt% of a coat pH regulator.
Specifically, the aqueous bisphenol a epoxy emulsion can be but is not limited to an aqueous epoxy emulsion obtained by emulsifying liquid epoxy E51; the aqueous novolac epoxy resin may be, but is not limited to, an aqueous dispersion of bisphenol a novolac epoxy resin having an average functionality of 3; the concrete wetting agent can be an acetylene glycol compound; the primer defoamer may be, but is not limited to, a polyether siloxane copolymer emulsion; the primer co-solvent may be, but is not limited to, propylene glycol methyl ether; the primer pH adjuster may be, but is not limited to, one of Dimethylethanolamine (DMEA), ammonia, and triethylamine.
The aqueous epoxy emulsion obtained by emulsifying the liquid epoxy E51 has low viscosity, small particle size and strong permeability on concrete, can permeate into the concrete and fully fills pores in the concrete; the water-based dispersion of the bisphenol A novolac epoxy resin with the average functionality of 3 can improve the crosslinking density of the coating, and the combination of the bisphenol A novolac epoxy resin and the water-based dispersion has good synergistic effect, so that the sealing primer layer has good sealing performance.
In the invention, the elastic finishing paint comprises, but is not limited to, 70-90 wt% of waterborne polyurethane resin, 3-5 wt% of nano silica sol, 0.3-0.5 wt% of graphene oxide, 0.3-0.5 wt% of nano silver powder, 5.2-9 wt% of elastic finishing paint auxiliary agent and the balance of solvent.
Wherein, the aqueous polyurethane resin can be but not limited to aqueous polyurethane dispersion; the elastic finishing paint assistant comprises but is not limited to 1-2 wt% of wetting dispersant, 0.3-0.5 wt% of foam inhibitor, 0.3-0.5 wt% of elastic finishing paint pH regulator, 0.3-0.5 wt% of seal primer wetting agent, 0.8-1.5 wt% of elastic finishing paint defoaming agent, 0.5-1.0 wt% of thickening agent and 2-3 wt% of film-forming assistant.
The wetting dispersant may be, but is not limited to, a block copolymer; the suds suppressor can be, but is not limited to, an organosiloxane; the elastic finishing coat pH regulator can be but is not limited to one of triethylamine, AMP95 and monoisopropanolamine; the sealer wetting agent can be, but is not limited to, silicone; the elastomeric topcoat defoamer can be, but is not limited to, one of BYK 8821, shilan T-4201A, and Youka FOAM 180W; the thickener may be, but is not limited to, associative type (Dow RM-8W, haimax WT-105A); the coalescing agent may be, but is not limited to, a dodecacarbonate.
The invention also discloses a preparation method of the double-layer special coating material, which comprises the following steps:
s1, mixing the component A and the component B according to-NH/-COC = 0.7-0.9 to obtain a seal primer;
s2, uniformly mixing all the components of the elastic finish paint, and grinding to obtain the elastic finish paint.
Wherein, the component A is prepared by mixing the raw materials except the primer pH regulator, grinding the mixture to the fineness of less than or equal to 20 mu m, adding 0.1 to 0.3 part of the pH regulator, and finally adding the solvent to regulate the viscosity.
The component B is prepared by uniformly mixing the raw materials.
In the preparation of the elastic finish paint, firstly, a solvent, a wetting dispersant and a foam inhibitor are mixed and then added with nano silica sol, graphene oxide and nano silver powder to be mixed and ground until the fineness is less than or equal to 20 mu m, so as to obtain slurry; and secondly, adding the rest raw materials into the slurry and uniformly stirring.
The preparation method is simple and feasible, and the prepared double-layer special coating material is stable in performance and can be stored for a long time.
The invention also discloses a construction method of the double-layer special coating material, which comprises the following steps: and coating the seal primer on the ground in the nuclear facility, curing for 24-30 hours to obtain a seal primer coating, and spraying the elastic finish on the seal primer coating.
In order to achieve good sealing effect, adsorption capacity and service time and realize stripping and replacement convenience, the thickness of the sealing primer coating is generally 80-100 micrometers, and the thickness of the elastic finish coating is 150-200 micrometers.
By adopting the construction method and meeting the requirements of the thicknesses of all coatings, the coating can be used for 2 to 3 years in a ground environment with low Po-210 aerosol deposition pollution level; in the ground environment with high Po-210 aerosol pollution level, according to actual requirements, the whole film is uncovered and decontaminated, and then the film is recoated, or a new elastic coating is recoated on the surface of the polluted elastic coating, so that the Po-210 aerosol in the near-environment space is further adsorbed and fixed, and then the film is flexibly uncovered and decontaminated.
Examples
Example 1
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The component A comprises main paint: and sequentially adding 70 parts of waterborne bisphenol A epoxy emulsion, 20 parts of waterborne novolac epoxy resin, 0.5 part of base material wetting agent, 0.5 part of defoaming agent and 5 parts of cosolvent into a dispersion tank, uniformly mixing, grinding at high speed until the fineness is less than or equal to 20 mu m, adding 0.2 part of pH regulator and the balance deionized water to regulate the viscosity, thus obtaining the waterborne bisphenol A epoxy emulsion.
B, component curing agent: 80 parts of water-based polyamide curing agent and the balance of deionized water.
Preparing a seal primer: and uniformly mixing the component A and the component B according to the proportion of-NH/-COC =0.8 to obtain the seal primer.
2) Polyurethane elastic finish paint
A pulping stage: 9.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor are added into a dispersion tank, and after uniform mixing, 3 parts of nano silica sol, 0.5 part of graphene oxide and 0.5 part of nano silver powder are added. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 80 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD 01, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Spraying a sealing primer with the spraying thickness of 80 mu m, and spraying a topcoat with the thickness of 100 mu m after a paint film is cured for 24 hours at room temperature to obtain the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Example 2
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The preparation method is the same as example 1.
2) Polyurethane elastic finish paint
And (3) a pulping stage: adding 12.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 5 parts of nano silica sol, 0.5 part of graphene oxide and 0.5 part of nano silver powder. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 75 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Firstly spraying a seal primer with the spraying thickness of 90 mu m, and spraying a finish paint with the thickness of 120 mu m after a paint film is cured for 24 hours at room temperature to obtain the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Example 3
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The preparation method is the same as example 1.
2) Polyurethane elastic finish paint
And (3) a pulping stage: adding 7.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 5 parts of nano silica sol, 0.5 part of graphene oxide and 0.5 part of nano silver powder. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 80 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Firstly spraying a seal primer with the spraying thickness of 100 mu m, and spraying a finish paint with the thickness of 150 mu m after a paint film is cured for 24 hours at room temperature to obtain the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Comparative example 1
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The preparation method is the same as example 1.
2) Polyurethane elastic finish paint
A pulping stage: adding 7.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 5 parts of nano silica sol and 0.5 part of graphene oxide. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 80 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD 01, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Firstly spraying a sealing primer with the spraying thickness of 100 mu m, and spraying a finish paint with the thickness of 150 mu m after a paint film is cured for 24 hours at room temperature, thus obtaining the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Comparative example 2
2) Polyurethane elastic finish paint
A pulping stage: adding 7.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 5 parts of nano silica sol and 0.5 part of nano silver powder. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 80 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD 01, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Firstly spraying a seal primer with the spraying thickness of 100 mu m, and spraying a finish paint with the thickness of 150 mu m after a paint film is cured for 24 hours at room temperature to obtain the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Comparative example 3
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The preparation method is the same as example 1.
2) Elastic top coat
And (3) a pulping stage: adding 7.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 5 parts of nano silica sol, 0.5 part of graphene oxide and 0.5 part of nano silver powder. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoaming agent AD 01, 3 parts of film-forming assistant and 1 part of thickening agent are added into the slurry.
Firstly spraying a sealing primer with the spraying thickness of 100 mu m, and spraying a finish paint with the thickness of 150 mu m after a paint film is cured for 24 hours at room temperature, thus obtaining the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
Comparative example 4
Preparing a double-layer special coating:
1) Two-component epoxy resin seal primer
The preparation method is the same as example 1.
2) Polyurethane elastic finish paint
And (3) a pulping stage: adding 7.4 parts of deionized water, 1 part of wetting dispersant and 0.5 part of foam inhibitor into a dispersion tank, uniformly mixing, and adding 0.5 part of graphene oxide and 0.5 part of nano silver powder. After being mixed evenly, the mixture is ground until the fineness is less than or equal to 20 mu m, and then the slurry is obtained.
And (3) paint mixing stage: 80 parts of waterborne polyurethane resin, 0.3 part of pH regulator, 0.5 part of base material wetting agent, 0.8 part of defoamer AD 01, 3 parts of film-forming additive and 1 part of thickener are added into the slurry.
Firstly spraying a seal primer with the spraying thickness of 100 mu m, and spraying a finish paint with the thickness of 150 mu m after a paint film is cured for 24 hours at room temperature to obtain the water-based double-layer special coating for removing the pollution of the ground Po-210 in the facility.
In examples 1-3 and comparative examples 1-4, in the preparation of the seal primer, the waterborne bisphenol a epoxy emulsion is bisphenol a epoxy resin 128, the waterborne novolac epoxy resin is novolac epoxy resin 5003, the substrate wetting agent is acetylenic diol, the antifoaming agent is polyether siloxane copolymer emulsion, and the cosolvent is propylene glycol methyl ether; in the preparation of the elastic finishing coat, the waterborne polyurethane resin is a waterborne polyurethane dispersion; the wetting dispersant is a block copolymer; the foam inhibitor is organic siloxane; the pH regulator is triethylamine; the substrate wetting agent is organosilicon; the antifoaming agent is Shilan T-4201A; the thickening agent is Haimax WT-105A; the film forming aid is dodecyl carbonate.
And (3) performance testing:
the examples 1 to 3 and comparative examples 1 to 4 were subjected to the performance test, and the test results are shown in Table 2:
TABLE 2 determination of the comprehensive Properties of aqueous two-layer protective coatings
As can be seen from the table 2, the aqueous double-layer special coating for removing Po-210 pollution on the ground in the nuclear facility, disclosed by the invention, has the advantages of good matching property of the seal coat and the strippable elastic adsorption finish paint, excellent physical and mechanical properties, good wear resistance and good irradiation resistance, can provide good decontamination effect for the inner wall and the ground of the nuclear facility, and is low in VOC content, non-combustible, non-explosive, safe and environment-friendly.
Compared with the comparative examples 1-2 and 3, when the graphene oxide and the nano silver powder are used independently, the adsorption performance of the elastic surface layer is far less than that of the elastic surface layer in matched use, so that the graphene oxide and the nano silver powder have a good synergistic effect in matched use and have better adsorption performance on Po-210.
In comparison with comparative example 3 and example 3, when the polyurethane resin was not added to the elastic top coat, the adhesion to the top coat was poor, and the film could not be formed, and the polyurethane resin had to be added.
Compared with the comparative example 4 and the example 3, the nano silica sol is not added in the elastic finishing coat, so that the prepared double-sided coating is difficult to remove, the workload is large, the concrete substrate is damaged, and the recoating is not facilitated.
The two-layer specialty coating from example 3 was tested for water resistance (test time 168 h) and the results are shown in FIG. 1. As can be seen from figure 1, after the water resistance test for 168h, the double-layer special coating is slightly whitened and has no abnormality.
The elastomeric topcoats of examples 1-3 were tested for 300% modulus as shown in FIG. 2.
The two-layer specialty coatings of examples 1-3 were tested for a 180 degree peel test as shown in fig. 3.
The dual layer specialty coatings of examples 1-3 were tested for gamma radiation resistance as shown in figure 4.
The dual layer specialty coatings of examples 1-3 were tested for alpha radiation resistance as shown in fig. 5.
Elongation and tear strength tests were performed on the elastomeric topcoats of examples 1-3, and the results are shown in fig. 6 and 7, respectively, and table 3.
Table 3 elongation and tear strength of the elastomeric topcoats of examples 1-3
As can be seen from Table 3, the elastic topcoats prepared in examples 1-3 all have good tensile strength and tear strength, and are beneficial to long-term service on the ground, i.e., have good service life.
The elastic paint films obtained in examples 1 to 3 were subjected to an abrasion test using a paint film abrasion tester as shown in FIG. 3.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A double-layer special coating material suitable for removing Po-210 pollution on the ground in nuclear facilities is characterized by comprising a seal primer and an elastic finish;
the seal primer is water-based two-component epoxy resin, and the elastic finish comprises water-based polyurethane resin, nano silica sol, graphene oxide and nano silver powder.
2. The dual layer specialty coating material suitable for floor decontamination of Po-210 within a nuclear facility as claimed in claim 1 wherein said seal coat comprises a component a and a component B, said a and B components being mixed in accordance with-NH/-COC = 0.7-0.9;
wherein: the component A comprises 60 to 80 weight percent of water-based bisphenol A epoxy emulsion, 15 to 25 weight percent of water-based novolac epoxy resin, 3.9 to 6.8 weight percent of seal primer assistant and the balance of solvent; the component B comprises 60 to 80 weight percent of waterborne polyamide curing agent and the balance of water.
3. The double-layer special coating material suitable for removing Po-210 pollution on the ground in the nuclear facility as claimed in claim 2, wherein the water-based bisphenol A epoxy emulsion is water-based epoxy emulsion obtained by emulsifying liquid epoxy E51; the aqueous novolac epoxy resin is an aqueous dispersion of bisphenol A novolac epoxy resin with an average functionality of 3.
4. The double-layer special coating material suitable for removing Po-210 pollution on the ground in the nuclear facility as claimed in claim 2 or 3, wherein the seal coat auxiliary agent comprises 0.3wt% -0.5 wt% of concrete wetting agent, 0.5wt% -1 wt% of primer defoaming agent, 3wt% -5 wt% of primer cosolvent and 0.1wt% -0.3 wt% of primer pH regulator.
5. The double-layer special coating material suitable for removing Po-210 pollution on the ground in the nuclear facility as claimed in any one of claims 1 to 4, wherein the elastic finishing paint comprises 70wt% -90 wt% of waterborne polyurethane resin, 3wt% -5 wt% of nano silica sol, 0.3wt% -0.5 wt% of graphene oxide, 0.3wt% -0.5 wt% of nano silver powder, 5.2wt% -9 wt% of elastic finishing paint auxiliary agent and the balance of water.
6. The double-layer special coating material suitable for removing Po-210 pollution on the ground in a nuclear facility as claimed in claim 5, wherein the elastic finishing paint auxiliary agent comprises 1-2 wt% of wetting dispersant, 0.3-0.5 wt% of foam inhibitor, 0.3-0.5 wt% of elastic finishing paint pH regulator, 0.3-0.5 wt% of seal primer wetting agent, 0.8-1.5 wt% of elastic finishing paint defoaming agent, 0.5-1.0 wt% of thickening agent and 2-3 wt% of film forming auxiliary agent.
7. The method for preparing a dual layer specialty coating material suitable for Po-210 contamination removal from the ground within a nuclear facility as claimed in any of claims 2-6 wherein the method of preparation comprises:
mixing the component A and the component B according to-NH/-COC = 0.7-0.9 to obtain the seal primer;
and uniformly mixing all the components of the elastic finish paint, and grinding to obtain the elastic finish paint.
8. A method of constructing a dual layer specialty coating material suitable for use in removing Po-210 contamination from the ground in nuclear facilities as claimed in claims 1 to 6 wherein said method of construction comprises:
and coating the seal primer on the ground in the nuclear facility, curing to obtain a seal primer coating, and spraying the elastic finish on the seal primer coating.
9. The construction method according to claim 8, wherein the thickness of the seal coat primer layer is 80-100 μm, and the thickness of the elastic top coat paint layer is 150-200 μm.
10. The method of claim 8 or 9, wherein the time of curing in the primer sealer coat after curing is 24 to 30 hours.
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