KR102035512B1 - Coating composition for radiation shielding excellent in fire-proofing and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a coating agent composition for shielding radiation with excellent fire-proofing properties, and a method for preparing the same. More specifically, the coating agent composition consists of a binder rein, a curing agent, a fire-proofing adjuvant, a fire-proofing agent, a flame-resistant agent, and a radiation-shielding agent, and is prepared through the following steps: a fire-proofing agent pretreatment step of immersing the fire-proofing agent in a sulfuric acid or nitric acid solution, followed by washing and drying; a radiation-shielding agent pretreatment step of immersing the radiation-shielding agent in an alcohol and irradiating the same with ultrasonic waves; a flame-resistant agent mixing step of mixing the fire-proofing adjuvant with the flame-resistant agent; and a raw material mixing and stirring step of mixing and stirring the binder resin with the curing agent, the fire-proofing agent pretreated in the fire-proofing agent pretreatment step, the radiation-shielding agent pretreated in the radiation-shielding agent pretreatment step, and a mixture produced through the flame-resistant agent mixing step. The coating agent composition prepared with the components and the method above has excellent radiation-shielding effects, and in particular, under high-temperature, high-pressure, and radiation conditions, such as in benchmark problems of nuclear power plant design, including a loss-of-coolant accident, a main-steam-line- break accident, and the like, the coating agent composition remains durable, thereby exhibiting excellent protection effects.

Description

Coating composition for radiation shielding having excellent fire resistance and manufacturing method thereof {COATING COMPOSITION FOR RADIATION SHIELDING EXCELLENT IN FIRE-PROOFING AND METHOD FOR MANUFACTURING THE SAME}

Disclosed is a radiation coating composition having excellent fire resistance and a method for manufacturing the same, and more particularly, the loss of coolant Accident (LOCA) or main engine breakage accident, which is excellent in the radiation shielding effect and nuclear design standards accident. It maintains its durability under high temperature, high pressure and radiation conditions caused by (Main Steam Line Break, MSLB) and shows excellent protection effect, and it has excellent fire resistance radiation that can be applied to low level radiation zones and chemical carriers that require fire resistance. It relates to a coating composition for shielding and a method of manufacturing the same.

Nuclear power plants have various types of buildings, such as containment buildings, auxiliary buildings, and nuclear fuel buildings. There are separate fireproof and radiation shielded areas inside the building.

Each building is designed to have a concrete wall of 1 to 1.2m thick to maintain safety and soundness.In particular, inside the containment building, liner plates made of carbon steel are 6mm thick, and concrete, liner plates, various equipment, On the surface of the installation, certified protective coatings which pass the radiation tolerance test, physical property test, fire evaluation test and Design Basis Accident test are installed.

Deterioration of concrete structures occurs with time, and there is always the possibility of deterioration such as east sea, neutralization, salt damage, chemical erosion, etc., to prevent deterioration, to withstand the effects of radiation, and to prevent the spread and spread of fire. In order to prevent the spread of fires due to nuclear accidents, safety-related devices for safety stop during the Design Basis Accident are also installed with certified coatings. Protective coating is a flame retardant material used in interior materials, etc., a fire-resistant coating is a material to protect the steel structure that supports the building, such as beams, pillars when the fire is greatly expanded.

In other words, the coating agent coated on the steel structure is a functional coating material that ensures lifespan evacuation time, prevents the structure collapse and delays by maintaining the supporting force of the structure for a certain time by forming the fireproof insulation layer by expanding the coating film in case of fire. .

The protective coating inside the containment building may cause problems in safety stoppage due to deterioration in the design base accident or failure of the defective protective coating due to recirculation cooling system. The containment building of the nuclear power plant has many physical damages due to the possibility of deterioration due to the effects of fire, temperature, humidity and radiation and the maintenance, repair and installation during the 18 months of planned preventive maintenance. Due to the possibility of the occurrence of secondary defects as a result of the damage, protective coating is installed on the surface of the equipment and repaired periodically on the damaged paint surface to prevent damage regardless of physical damage caused by aging or maintenance. Self-permeation

However, the coating agent conventionally applied to the protective coating for nuclear power plants is not environmentally friendly due to the high organic solvent content, there is a problem that the maintenance period is short because the durability is not maintained for a long time at high temperature, high pressure and radiation conditions.

Korean Patent Registration No. 10-0970580 (2010.07.09)

The disclosed contents are excellent radiation shielding and radiation resistance coating composition having excellent fire resistance and excellent durability by maintaining durability at high temperature, high pressure, and radiation conditions caused by loss of coolant or breakdown of main steam engine, which is a design standard accident of nuclear power plant. It is to provide a manufacturing method.

As an example, the disclosure is comprised of a binder resin, a curing agent, a fire retardant, a fire retardant, a flame retardant and a radiation shielding agent, wherein the binder resin is in the group consisting of epoxy, urethane, silicate, polyester and urethane modified epoxy. Made of one selected, the flame retardant has been described for a radiation-resistant coating composition excellent in fire resistance, characterized in that consisting of pentaerythritol.

Preferably, the coating composition for radiation shielding having excellent fire resistance is 28 to 43% by weight of binder resin, 9 to 12% by weight of curing agent, 4 to 7% by weight of refractory aid, 21 to 33% by weight of fireproof agent, and 7 to 9% by weight of flame retardant. % And 13 to 23 weight percent radiation shielding agent.

More preferably, the refractory aid may be made of one or more selected from the group consisting of magnesium, silicon, aluminum hydroxide and magnesium hydroxide.

In addition, as another example, the contents of this disclosure consist of a binder resin, a fireproofing agent, a flame retardant and a radiation shielding agent, the binder resin being in the group consisting of oil alkyd, polyvinyl chloride, acrylic, polyvinylacetate and amino alkyd. Made of one selected, the flame retardant has been described for a radiation-resistant coating composition excellent in fire resistance, characterized in that consisting of pentaerythritol.

Preferably, the coating composition for radiation shielding having excellent fire resistance may be composed of 44 to 57% by weight of binder resin, 12 to 22% by weight of fire resistant agent, 7 to 9% by weight of flame retardant and 20 to 30% by weight of radiation shielding agent.

More preferably, the fireproofing agent may be made of one selected from the group consisting of graphite, multilayer graphene, ammonium polyphosphate and melamine.

More preferably, the radiation shielding agent may be made of one or more selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium and strontium.

In addition, as another embodiment of the present disclosure is a refractory pretreatment step of washing and drying the refractory agent in a sulfuric acid or nitric acid solution, the radiation shielding pretreatment step of immersing the radiation shielding agent in alcohol and irradiating ultrasonic waves, Flame retardant mixing step of mixing the fire retardant and flame retardant and the curing agent in the binder resin, the pre-treatment of the pre-treatment through the fire-resistant pretreatment step, the radiation shielding agent pre-treated through the radiation shielding pretreatment step and the mixture prepared by the flame retardant mixing step It describes a method for producing a coating composition for radiation shielding excellent radiation resistance, characterized in that the mixing and stirring step of mixing the raw materials.

In addition, as another embodiment, the contents of the present disclosure include a fireproof agent pretreatment step of washing and drying a refractory agent in a sulfuric acid or nitric acid solution, a radiation shielding agent treatment step of dipping a radiation shielding agent in alcohol, and irradiating ultrasonic waves; The fire-resistant coating composition for excellent radiation resistance, characterized in that the binder resin is a pre-treatment of the pre-treatment through the pre-treatment step, the raw material mixing and stirring step of mixing and stirring the radiation shielding pretreatment through the radiation shielding pretreatment step. The manufacturing method is described.

Preferably, the raw material mixing and stirring step may be made at a temperature of 40 to 50 ℃.

As described above, the coating composition for radiation shielding having excellent fire resistance and a method of manufacturing the same have excellent radiation shielding effect and durability in high temperature, high pressure, and radiation conditions caused by loss of coolant or breakage of main steam engine, which is a design standard accident of nuclear power plant. Excellent effect of providing a coating composition exhibiting an excellent protective effect.

1 is a flow chart showing a method of manufacturing a radiation shielding coating composition excellent in fire resistance according to one embodiment disclosed.
Figure 2 is a flow chart illustrating a method for producing a coating composition for radiation shielding excellent in accordance with another embodiment disclosed.

In the following, preferred embodiments of the present invention and the physical properties of each component will be described in detail, which is intended to explain in detail enough to be able to easily carry out the invention by one of ordinary skill in the art, This does not mean that the technical spirit and scope of the present invention is limited.

The disclosure discloses that the coating composition for radiation shielding having excellent fire resistance may be prepared in two-component and one-component forms. In the case of the two-component coating composition, a binder resin, a curing agent, a fireproof aid, a fireproof agent, a flame retardant, and a radiation shielding agent may be used. It is preferably composed of 28 to 43% by weight, hardener 9 to 12% by weight, fire retardant 4 to 7% by weight, fire retardant 21 to 33% by weight, flame retardant 7 to 9% by weight and radiation shielding agent to 13 to 23% by weight.

In addition, in the case of the one-component coating composition, the curing agent and the refractory aid are not contained, and the components of the binder resin also show a difference from the two-component type, and are composed of a binder resin, a fireproofing agent, a flame retardant and a radiation shielding agent, and a binder resin 44 to 57% by weight. It is preferably composed of 12 to 22% by weight of a fire resistant agent, 7 to 9% by weight of a flame retardant and 20 to 30% by weight of a radiation shielding agent.

The binder resin binds each component used in the disclosed radiation-resistant coating composition having excellent fire resistance and serves to impart adhesive performance. In the case of the two-component coating composition, the binder resin is epoxy, urethane, silicate, polyester, and the like. It is preferable that it is made of one selected from the group consisting of urethane-modified epoxy, and in the case of the one-component coating composition, the binder resin is preferably made of one selected from the group consisting of oil alkyd, polyvinyl chloride, acrylic, polyvinylacetate, and amino alkyd.

Among the components used as the binder resin, heat resistance and adhesiveness of the coating composition may be secured due to the synthesis of the epoxy and the urethane-modified epoxy and the amine-based curing agent as in Scheme 1 below.

Scheme 1

Examples of the epoxy resin used in the urethane-modified epoxy include alicyclic epoxy resins such as bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins and phenol novolac type epoxy resins, and propylene glycidyl ethers. It may be one of the aliphatic epoxy resins, may be used by mixing them, it is preferable to use a phenol A type epoxy resin which is a urethane-modified epoxy resin containing a relatively large amount of hydrogen atoms compared to other epoxy resins.

It also shields, flame-proofs, and shields radiation from xenon, x-rays, radium, radon, anions, strontium-90, etc., which are contaminated by alpha and beta rays from thorium and uranium, which are emitted from medical and industrial environments, and from thorium and uranium, which are expressed from building aggregate Examples of the coating agent include acryl-based acrylic, styrene acryl, acrylonitrile acryl styrene butadiene, vinyl acetate polymer, vinyl acetate, vinyl acetate, and the like, butadiene styrene may be used as an acryl latex that is a water-soluble latex or latex binder.

The curing agent contains 9 to 12% by weight, and is composed of an amine curing agent, which reacts with epoxy, urethane, silicate, polyester, and urethane-modified epoxy, which are binder resins used in the two-component coating composition, to provide heat and adhesive properties. Serves to provide a good coating composition.

When the content of the curing agent is less than 9% by weight, the curing of the coating composition proceeds slowly, and the above effect is insignificant. When the content of the curing agent exceeds 12% by weight, the curing proceeds rapidly and the processability of the coating composition decreases. Can be.

The refractory aid is contained 4 to 7% by weight, consisting of one or more selected from the group consisting of aluminum hydroxide and magnesium hydroxide, serves to further improve the fire resistance of the disclosed coating composition.

The refractory agent serves to impart fire resistance to the disclosed coating composition, preferably consisting of one selected from the group consisting of graphite, multilayer graphene, ammonium polyphosphate and melamine.

The refractory agent contains 21 to 33% by weight of the two-component coating composition, 12 to 22% by weight of the one-component coating composition, if the content of the refractory agent is less than the above range, the fire resistance performance of the coating composition This may be lowered, and when the content of the refractory agent exceeds the above range, the adhesion of the coating composition may be lowered.

Among the components of the refractory agent listed above, graphene is a multilayer graphene. Graphene is a term made by combining graphite, which means graphite, and a suffix, which means a molecule having a carbon double bond, It is divided into single-layer graphene (Single-Layer Graphene), two-layer graphene (Two-Layer Graphene) and multilayer graphene (Multi-Layer Graphene or Graphite), etc., The multilayer graphene used in the disclosed coating composition is flame retardant And impart fire resistance, and exhibit energy absorption and dispersion properties of the shielding material.

In addition, ammoniumpolyphosphate consists of three tetrahedral PO ₄ units linked together by sharing an oxygen center, where in the linear chain the terminal groups share one oxide and the remaining phosphorus centers share two oxide centers. . The corresponding phosphate is associated with acid by the loss of acidic protons, and in the case of cyclic trimers, each tetrahedron shares two vertices and three corners with adjacent tetrahedrons, the motif representing the crosslinking of the linear polymer, Cross-linked polyphosphate adopts a sheet structure but acts to block the flame because this structure occurs only at high temperature conditions.

As shown in Scheme 2 below, in the case of ammonium polyphosphate, a high refractory phosphorus content is high, and -O- in the structure reacts with the epoxy resin to combine the ammonium polyphosphate with the network polymer structure to improve the fire resistance of the disclosed coating composition. , Melamine has many fire-resistant amine groups and shows excellent fire resistance in itself. In addition, the melamine reacts with epoxy resin to form a three-dimensional network structure.

Scheme 2

At this time, the refractory agent is preferably applied in a state in which impurities are removed by washing after immersion in sulfuric acid or nitric acid solution for 4 to 6 hours.

The flame retardant is made of pentaerythritol, which is an environmentally friendly alternative to conventional electric transformer oils, and is easily biodegradable in water and harmless to the human body.

In addition, when used with graphite containing tungsten, one of the radiation shielding agent, when it is heated, it generates a thick carbon barrier, which turns into a char to shield the radiation and block the flame. This process is shown in Scheme 3 below.

Scheme 3

The radiation shielding agent serves to impart radiation shielding performance to the coating composition, and comprises at least one selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium, and strontium, which range from 500 nanometers to 5 micrometers. It is preferable to apply in the form of powder ground to the size of a meter.

The radiation shielding agent crushed to the same size increases the probability of collision with the incident radiation, thereby improving the shielding performance of the radiation, and the radiation impinging the radiation shielding agent reduces the length of the average free path and absorbs the radiation (and Since the probability of attenuation is increased, the radiation is effectively shielded.

When the particle size of the radiation shielding agent is less than 500 nanometers, the grinding process becomes complicated, and when the particle size of the radiation shielding agent exceeds 5 micrometers, the radiation shielding efficiency decreases drastically.

In addition, when the content of the radiation shielding agent is less than the above range, the radiation shielding effect of the coating composition is lowered, and when the content of the radiation shielding agent exceeds the above range, the viscosity of the coating composition is excessively increased to reduce workability.

At this time, the radiation shielding agent consisting of the above components is preferably used to remove the impurities by irradiating the ultrasonic wave for 1-2 hours after immersion in ethyl alcohol, the frequency of the ultrasonic wave is preferably applied at 26 to 27MHz Do.

In addition, the disclosed method for producing a coating composition for radiation shielding excellent fire resistance is a refractory pretreatment step (S101) of washing and drying after immersing the refractory agent in a sulfuric acid or nitric acid solution, radiation immersing the radiation shielding agent in alcohol and irradiating ultrasound Shielding agent pretreatment step (S101-1), flame retardant mixing step of mixing the refractory auxiliary agent and flame retardant (S101-2) and the curing agent to the binder resin, the fire-retardant pretreated through the refractory pretreatment step (S101), the radiation shielding pretreatment step It consists of a raw material mixing and stirring step (S103) of mixing and stirring the radiation shielding agent and the mixture prepared through the flame retardant mixing step (S101-2) pretreated through (S101-1).

The refractory pretreatment step (S101) is a step of washing and drying the refractory agent in a sulfuric acid or nitric acid solution, and drying the sulfuric acid in a refractory powder selected from the group consisting of graphite, multilayer graphene, ammonium polyphosphate, and melamine. Or after immersing in nitric acid solution for 4 to 6 hours, the surface is washed and dried to remove impurities contained in the refractory.

In this case, when the graphite is used as the fireproofing agent, the particle size of graphite is preferably 5 micrometers or less, and when the multilayered graphene is used as the fireproofing agent, the particle size is preferably 1000 nanometers or less.

At this time, the critical significance according to the component, role and content of the fire-resistant agent is the same as described in the disclosed coating composition for radiation shielding excellent fire resistance, the description thereof will be omitted.

The radiation shielding preparation step (S101-1) is a step of immersing the radiation shielding agent in alcohol and irradiating ultrasonic waves, consisting of one or more selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium and strontium. The radiation shielding agent is immersed in ethyl alcohol and irradiated with an ultrasonic wave of 26 to 27 MHz for 1 to 2 hours to remove foreign substances contained in the radiation shielding agent.

At this time, the critical significance according to the components, role and content of the radiation shielding agent is the same as the contents described in the disclosed radiation-resistant coating composition excellent fire resistance, the description thereof will be omitted.

The flame retardant mixing step (S101-2) is a step of mixing a fire retardant and a flame retardant, and a fire retardant and pentaerythritol which is one or more selected from the group consisting of magnesium, silicon, aluminum hydroxide and magnesium hydroxide, brabender ( in a stirrer, such as a brabender).

When the mixing process is performed using the brabender as described above, the components of the refractory aid and the flame retardant are evenly mixed.

In this case, the critical significance according to the components, roles and contents of the fire retardant and flame retardant are the same as those described in the disclosed coating composition for radiation shielding excellent fire resistance, a description thereof will be omitted.

The mixing step of mixing the raw material (S103) is a curing agent in a binder resin, a fireproofing agent pretreated through the fireproof pretreatment step (S101), a radiation shielding agent pretreated through the radiation shielding pretreatment step (S101-1) and the ball mill mixing step. Mixing and stirring the mixture prepared through (S101-2), binder resin 28 to 43% by weight, curing agent 9 to 12% by weight, radiation shielding agent 13 to 23% by weight and the flame retardant mixing step (S101-2) 11 to 16% by weight of the mixture prepared by adding to a vacuum stirrer and made by stirring for 3 to 8 minutes at a rate of 100 to 200rpm at a temperature of 40 to 50 ℃.

At this time, the curing agent is preferably made of an amine curing agent, the binder resin is preferably made of one selected from the group consisting of epoxy, urethane, silicate, polyester and urethane-modified epoxy, the flame retardant is made of pentaerythritol desirable.

In addition, the disclosed method for producing a coating composition for radiation shielding excellent fire resistance is a refractory pretreatment step (S101) of washing and drying after immersing the refractory agent in a sulfuric acid or nitric acid solution, radiation immersing the radiation shielding agent in alcohol and irradiating ultrasound Raw material mixture for mixing and stirring the shielding agent pretreatment step (S101-1) and the binder resin pretreated through the refractory agent pretreatment step (S101) and the radiation shielding agent pretreated through the radiation shielding agent pretreatment step (S101-1). It may be made of a stirring step (S103-1).

At this time, the mixing step of mixing the raw material (S103-1) is made by mixing and stirring the binder resin 44 to 57% by weight, fire-resistant 12 to 22% by weight, flame retardant 7 to 9% by weight and radiation shielding 20 to 30% by weight. Preferably, the binder resin used in the raw material mixing and stirring step (S103-1) is preferably made of one selected from the group consisting of oil alkyd, polyvinyl chloride, acrylic, polyvinylacetate and amino alkyd, and a fireproofing agent, flame retardant and The component of a radiation shielding agent can be applied similarly to the component described above.

Hereinafter, the physical properties of the coating composition prepared by the method of preparing a coating composition for radiation shielding excellent disclosed fire resistance and the production method will be described by way of examples.

<Example 1>

Epoxy resin 39% by weight, amine-based curing agent 12% by weight, aluminum hydroxide 4% by weight, graphite 2% by weight, ammonium polyphosphate 12% by weight, pentaerythritol 7% by weight, melamine 7% by weight, Prussian blue 4%, 8 wt% of tungsten and 5 wt% of barium were added to a mixer equipped with a stirrer and stirred for 5 minutes at a temperature of 40 to 50 ° C. and a speed of 150 rpm to prepare a coating composition for radiation shielding having excellent fire resistance.

<Example 2>

28% by weight of urethane resin, 9% by weight of amine curing agent, 7% by weight of magnesium hydroxide, 4% by weight of graphite, 18% by weight of ammonium polyphosphate, 9% by weight of pentaerythritol, 7% by weight of melamine, 4% by weight of Prussian blue, 8% by weight of tungsten and 6% by weight of strontium were added to a mixer equipped with a stirring device and stirred at a speed of 150 rpm for 5 minutes to prepare a coating composition for radiation shielding having excellent fire resistance.

<Example 3>

28% by weight modified epoxy resin, 9% by weight amine curing agent, 7% by weight magnesium hydroxide, 4% by weight multilayer graphene, 13% by weight ammonium polyphosphate, 9% by weight pentaerythritol, 7% by weight melamine, Prussian blue 4 8% by weight, tungsten 8% by weight, bismuth 4% by weight and 7% by weight of barium were added to the mixer equipped with a stirring device and stirred for 5 minutes at a speed of 150rpm to prepare a coating composition for excellent radiation shielding excellent fire resistance.

<Example 4>

Modified epoxy resin 28% by weight, amine-based curing agent 9% by weight, aluminum hydroxide 7% by weight, multilayer graphene 4% by weight, ammonium polyphosphate 15% by weight, pentaerythritol 7% by weight, melamine 7% by weight, Prussian blue 4 Wt%, tungsten 5% by weight, bismuth 5% by weight, barium 5% by weight and strontium 4% by weight to a mixer equipped with a stirring device and stirred for 5 minutes at a speed of 150rpm to provide a coating composition for excellent radiation shielding Prepared.

Example 5

53% by weight of water-soluble acrylic, 4% by weight of graphite, 12% by weight of ammonium polyphosphate, 7% by weight of pentaerythritol, 7% by weight of melamine, 4% by weight of Prussian blue, 8% by weight of tungsten and 5% by weight of barium Into the equipped mixer and stirred for 5 minutes at a speed of 150rpm to prepare a coating composition for excellent radiation shielding fire resistance.

<Example 6>

40% by weight of acrylic latex, 4% by weight of graphite, 22% by weight of ammonium polyphosphate, 9% by weight of pentaerythritol, 7% by weight of melamine, 4% by weight of Prussian blue, 8% by weight of tungsten and 6% by weight of strontium Into the equipped mixer and stirred for 5 minutes at a speed of 150rpm to prepare a coating composition for excellent radiation shielding fire resistance.

<Example 7>

40 wt% acrylic latex, 4 wt% multilayer graphene, 15 wt% ammoniumpolyphosphate, 9 wt% pentaerythritol, 7 wt% melamine, 6 wt% prussian blue, 8 wt% tungsten, 4 wt% bismuth and barium 7 wt% was added to a mixer equipped with a stirring device and stirred at a speed of 150 rpm for 5 minutes to prepare a coating composition for radiation shielding having excellent fire resistance.

<Example 8>

40 wt% acrylic latex, 4 wt% multilayer graphene, 15 wt% ammoniumpolyphosphate, 7 wt% pentaerythritol, 7 wt% melamine, 4 wt% prussian blue, 5 wt% tungsten, 5 wt% bismuth, barium 7% by weight and 6% by weight of strontium were added to a mixer equipped with a stirring device, and stirred at a speed of 150 rpm for 5 minutes to prepare a coating agent (Coating Agent) composition having excellent fire resistance.

Chemical resistance, adhesion, flame propagation, abrasion resistance, fouling resistance and DBA of the radiation-resistant coating composition excellent in fire resistance prepared through Examples 1 to 8 were measured based on the Nuclear Safety and Technology Institute nuclear protection coating technical standards 1 is shown.

{However, the evaluation criteria for chemical resistance should not be stripped or dropped.

In addition, the DBA Test Criteria shall be free of dropping or peeling, allowing undamaged swelling of the surroundings that are intact and permitting cracks that do not involve dropping or reduced adhesion.}

TABLE 1

As shown in Table 1, it can be seen that the radiation-resistant coating composition for excellent radiation resistance prepared through Examples 1 to 8 of the present invention satisfies all chemical resistance, adhesion, flame propagation, wear resistance, pollution resistance and DBA. .

In addition, the radiation shielding performance of the radiation-resistant coating composition excellent in fire resistance prepared through Examples 1 to 8 was measured in accordance with ASTM S4060, the radiation evaluation criteria, and is shown in Table 2 below.

{However, the radiation shielding performance was measured based on the attenuation rate of the radiation emitted from cobalt 60 and cesium 137, and the radiation test evaluation criterion was 2.0X104Gy when the surface was cracked / fragmented, peeled / dropped off when irradiated. / Peeling / blowing is a condition of not allowed.}

TABLE 2

As shown in Table 2, it can be seen that the coating composition for radiation shielding excellent fire resistance prepared through Examples 1 to 8 of the present invention shows an excellent radiation shielding effect.

Accordingly, the disclosed coating composition for radiation protection and coating method prepared by the manufacturing method having excellent fire resistance is excellent in the radiation shielding effect, high temperature, high pressure and radiation conditions resulting from the loss of coolant or breakage of the main steam engine, which is a design standard accident of the nuclear power plant. Durability is maintained at, which shows an excellent protective effect.

S101; Refractory pretreatment step
S101-1; Radiation Shielding Agent
S101-2; Flame Retardant Mixing Step
S103, S103-1; Raw material mixture stirring step

Claims (10)

28 to 43 wt% of binder resin, 9 to 12 wt% of curing agent, 4 to 7 wt% of refractory aid, 21 to 33 wt% of fireproof agent, 7 to 9 wt% of flame retardant and 13 to 23 wt% of radiation shielding agent,
The binder resin is made of one selected from the group consisting of epoxy, urethane, silicate, polyester and urethane modified epoxy,
The flame retardant is a coating composition for radiation shielding excellent fire resistance, characterized in that consisting of pentaerythritol.
delete The method according to claim 1,
The refractory aid is a radiation-resistant coating composition excellent radiation resistance, characterized in that made of one or more selected from the group consisting of magnesium, silicon, aluminum hydroxide and magnesium hydroxide.
44 to 57% by weight of binder resin, 12 to 22% by weight of fire-resistant, 7 to 9% by weight of flame retardant, and 20 to 30% by weight of radiation shielding agent,
The binder resin is made of one selected from the group consisting of oil alkyd, polyvinyl chloride, acrylic, polyvinylacetate and amino alkyd,
The flame retardant is a coating composition for radiation shielding excellent fire resistance, characterized in that consisting of pentaerythritol.
delete The method according to claim 1 or 4,
The fire-resistant coating composition for excellent radiation resistance radiation shielding, characterized in that made of one selected from the group consisting of graphite, multilayer graphene, ammonium polyphosphate and melamine.
The method according to claim 1 or 4,
The radiation shielding agent is a radiation resistant coating composition excellent radiation resistance, characterized in that made of one or more selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium and strontium.
Refractory pretreatment step of washing and drying the surface after immersing the refractory powder of one selected from the group consisting of graphite, multilayered graphene, ammonium polyphosphate and melamine in sulfuric acid or nitric acid solution for 4 to 6 hours;
A radiation shielding pretreatment step of immersing a radiation shielding agent consisting of one or more selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium and strontium in ethyl alcohol and irradiating an ultrasonic wave of 26 to 27 MHz for 1 to 2 hours. ;
Flame retardant mixing step of adding a refractory adjuvant consisting of one or more selected from the group consisting of magnesium, silicon, aluminum hydroxide and magnesium hydroxide and pentaerythritol which is a flame retardant and mixing; And
In the binder resin, a curing agent, a fireproofing agent pretreated through the fireproof agent pretreatment step, a radiation shielding agent pretreated through the radiation shielding pretreatment step, and a mixture prepared by the flame retardant mixing step are added to a vacuum stirrer. A method of producing a coating composition for radiation shielding excellent fire resistance, characterized in that consisting of; mixing the raw material mixing stirring step at a temperature.
Refractory pretreatment step of washing and drying the surface after immersing the refractory powder of one selected from the group consisting of graphite, multilayered graphene, ammonium polyphosphate and melamine in sulfuric acid or nitric acid solution for 4 to 6 hours;
A radiation shielding pretreatment step of immersing a radiation shielding agent consisting of one or more selected from the group consisting of Prussian blue, tungsten, bismuth, barium, europium, dysprosium and strontium in ethyl alcohol and irradiating an ultrasonic wave of 26 to 27 MHz for 1 to 2 hours. ; And
A fire retardant coating composition having excellent fire resistance, characterized in that consisting of a binder resin pre-treatment pretreatment through the refractory pretreatment step, a raw material mixing and stirring step of mixing and stirring the radiation shielding pretreatment through the radiation shielding pretreatment step; Manufacturing method.
delete

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