Plugging elimination control agent, and preparation method and application thereof

Abstract

The invention belongs to the field of nuclear substance leakage accident disposal, and particularly relates to a plugging elimination and control agent and a preparation method and application thereof. The plugging elimination and control agent comprises isocyanate, polyether, a diluent, amino-terminated polyether, a chain extender, a dispersant, a flame retardant, a defoaming agent, a light stabilizer, an antioxidant, a pigment, a coupling agent, a rheological agent, a mildew preventive and an antistatic agent. The blocking, eliminating and controlling agent is mainly used for blocking a high-risk and high-toxicity gas (with pressure or without pressure) leakage source-crevasse or crack caused by explosion or strong impact, cutting off a channel for continuously releasing the leakage source from the crevasse or crack, and controlling high-risk and high-toxicity products contaminated on the periphery of the crevasse or crack to suspend and diffuse again. And the accident hazard degree and range are reduced.

Description

Technical Field

[0001] The invention belongs to the field of nuclear material leakage accident disposal, and specifically relates to a plugging and control agent, and a preparation method and application thereof. Background Art

[0002] It is well known that nuclear materials are highly dangerous and toxic. Both internal and external exposures exceeding the dose limit will cause harm to human health, life and the living environment. Nuclides with different half-lives and radiation intensities released in nuclear leakage accidents diffuse in the air, settle on the earth, and contaminate the surface of objects, posing a serious threat to the environment on which humans depend for survival. Therefore, nuclear accident emergency response actions are a powerful means to reduce the intensity and scope of accident hazards and to protect the environment and human health and safety to the greatest extent. The sealing of the leakage source and the control of surrounding releases, splashes, contamination or sedimentation are the primary tasks of nuclear accident emergency actions.

[0003] Plugging and control is an important part of emergency response to leakage sources, mitigation of accident hazards, and nuclear environmental safety. The advancement of technology, environmental adaptability, and effectiveness of application are of great significance to environmental protection and safe production.

[0004] In the early stage of an accident, the objects of emergency disposal are mostly damaged cracks in nuclear equipment and instruments, damaged containers and other cracks and pores. Due to the persistence of nuclear leakage and its diffusion with airflow, its harmfulness and destructiveness double over time. Therefore, the principle of manual intervention in the process of leakage nuclear accidents, that is, the initial emergency disposal, is that the earlier the intervention time, the better. At the same time, rapid plugging of the source of leakage and release is a must for dealing with the consequences of accidents. The means of plugging the breaches or cracks of hazardous materials and the plugging and control materials will inevitably become a hot issue that needs to be solved in the field of nuclear, biological and chemical accident emergency response and an urgent need for the construction of nuclear, biological and chemical emergency rescue capabilities.

[0005] Therefore, based on this, the technical solution of the present invention is proposed. Summary of the invention

[0006] In order to solve the problems existing in the prior art and meet the urgent needs and gaps in the construction of emergency forces for nuclear, biological and chemical accidents caused by explosions or strong impacts, the present invention proposes a plugging and fire control agent, its preparation method and application. The plugging and fire control agent is mainly used to plug the leakage source of high-risk and highly toxic gases (pressurized or unpressurized) caused by explosions or strong impacts - the breach or crack, cut off its continuous release channel from the breach or crack, and control the re-suspension and diffusion of high-risk and highly toxic gases that have been contaminated around the breach or crack, reducing the degree and scope of the accident.

[0007] The present invention provides a plugging and control agent, which comprises a liquid component A and a liquid component B; wherein:

[0008] The liquid component A comprises the following raw materials in parts by weight: 35-60 parts of isocyanate, 10-20 parts of polyether, and 5-20 parts of diluent;

[0009] The liquid component B includes the following raw materials in parts by weight: 60-80 parts of terminal amino polyether, 5-25 parts of chain extender, 0.4-1.2 parts of dispersant, 2-6 parts of flame retardant, 0.2-0.3 parts of defoamer, 0.1-0.5 parts of light stabilizer, 0.1-0.5 parts of antioxidant, 0.1-0.3 parts of pigment, 0.5-1.5 parts of coupling agent, 2-5 parts of rheological agent, 0.1-1 parts of mildewproof agent and 2-4 parts of antistatic agent.

[0010] Preferably, the liquid component A comprises the following raw materials in parts by weight: 40 parts of isocyanate, 15 parts of polyether, and 5 parts of diluent;

[0011] The liquid component B includes the following raw materials in parts by weight: 60 parts of amino-terminated polyether, 5 parts of chain extender, 0.6 parts of dispersant, 2 parts of flame retardant, 0.2 parts of defoamer, 0.1 parts of light stabilizer, 0.1 parts of antioxidant, 0.1 parts of pigment, 0.5 parts of coupling agent, 2 parts of rheological agent, 0.1 parts of mildewproof agent and 2 parts of antistatic agent.

[0012] Preferably, the isocyanate includes at least one of an aliphatic isocyanate and an aromatic isocyanate; the aliphatic isocyanate includes hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), xylylene diisocyanate (XDI), cyclohexane dimethylene diisocyanate (H6XDI, also known as hydrogenated xylylene diisocyanate, hydrogenated XDI), 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI, H12XDI, The aromatic isocyanate includes at least one of diphenylmethane-4,4'-diisocyanate (MDI), m-phenylene diisocyanate, p-phenylene diisocyanate, liquefied diphenylmethane diisocyanate (a modified MDI, referred to as liquefied MDI and LMDI), 2,4-toluene diisocyanate, and 4,4'-diphenylpropane diisocyanate;

[0013] And / or, the polyether includes at least one of a hydroxyl-terminated polyether and an amino-terminated polyether; the hydroxyl-terminated polyether includes at least one of polyoxypropylene polyol (PPG), hydroxyl-terminated polybutadiene (HTPB), and hydroxyl-terminated polyethylene / butylene polymer; the amino-terminated polyether includes at least one of the difunctional D series polyethers D-230, D-400, D-2000, and D-4000 and the trifunctional T series polyethers T-403, T-3000, and T-5000;

[0014] And / or, the diluent includes at least one of dibutyl phthalate (DBP), dioctyl phthalate (DOP), diisononyl phthalate, propyl carbonate (PC), and ethyl carbonate (EC).

[0015] Preferably, the chain extender includes at least one of an aromatic chain extender and an aliphatic chain extender; the aromatic chain extender includes 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 3,3'-diethyl-4,4'-diaminodiphenylmethane, diethyltoluenediamine (DETDA or E-100), 3,5-dimethylthiotoluenediamine (DMTDA or E-300), 2,4-diamino-3,5-dimethylthiochlorobenzene (TX-2), 3-methylthio-5-propyl-2,4-toluenediamine, N,N-dialkylmethyldiamine N,N-Dialkylphenylenediamine (70% and 30% tetrahydroxy crosslinker premixed), (70% and 30% tetrakis (2-hydroxypropyl) ethylenediamine premixed) at least one; the aliphatic chain extender includes IPDA (3-aminomethyl-3,5,5-trimethylcyclohexylamine, also known as isophorone diamine), Clearlink TM 1000、Clearlink TM 3000、Versalink TM 650、Versalink TM 1000、Jefflink TM 555. Jefflink TM 754. Jefflink TM At least one of 7027;

[0016] And / or, the dispersant includes a cationic surfactant, an anionic surfactant or a non-polar surfactant; the cationic surfactant includes at least one of alkyl quaternary ammonium salt, aminopropylamine dioleate quaternary ammonium salt, and specially modified polyaminoamide phosphate; the anionic surfactant includes sodium oleate, sulfate, sulfonate, phosphate (ROSO 3 Na) at least one; the non-polar surfactant includes at least one of a polyethyleneimine derivative, a polydimethylsiloxane, and a modified silicone polymer;

[0017] And / or, the flame retardant includes at least one of tris(2-chloroethyl) phosphate (TCEP), tris(2-chloroisopropyl) phosphate (TCPP), dimethyl methyl phosphate (DMMP), 1,2-ethylenetetrakis(2-chloroethyl) diphosphate, tetrakis(2-chloroethyl)ethoxy diphosphate, tetrakis(1,3-dichloro-2-propyl)-1,2-ethylene diphosphate, N,N-bis(2-hydroxypropyl)-2,4,6-tribromoaniline (BHTBA), triphenyl phosphate, polyphosphate amine, and chlorinated paraffin;

[0018] And / or, the defoaming agent includes at least one of polypropylene glycol, tributyl phosphate, isopropanol, and n-butanol.

[0019] Preferably, the light stabilizer includes at least one of 2-hydroxy-4-methoxybenzophenone (UV-9), 2,2'-dihydroxy-4-methoxybenzophenone (UV-24), 2,2'-dihydroxy-4,4'-dimethoxybenzophenone (UV-49), 2-(2'-hydroxy-3',5'-dipentylphenyl)benzophenone (UV-531), 2(2-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole (UV-328), bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (UV-292), and UV-119s;

[0020] And / or, the antioxidant includes at least one of 2,6-di-tert-butyl-4-methylphenol (BHT, referred to as antioxidant 264), pentaerythritol tetrakis(4-hydroxy-3,5-tert-butylphenylpropionate) (referred to as antioxidant 1010), 3,5-di-tert-butyl-4-hydroxyphenylpropionate octadecyl (referred to as antioxidant 1076), bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (Tinuvin770), tris(nonylphenyl) phosphite (TNP), phenothiazine, bis(β-3,5-di-tert-butyl-4-hydroxyphenylpropionate) hexanediol, and triphenyl phosphate (TPP);

[0021] And / or, the pigment includes at least one of red powder, medium chrome yellow, phthalocyanine green, carbon black, and titanium dioxide;

[0022] And / or, the coupling agent includes at least one of KH-550, KH-560, KH-570, a titanate coupling agent, and an organic chromium coupling agent.

[0023] Preferably, the rheological agent includes at least one of soluble hydrogenated castor oil, oxidized polyethylene, and fumed silica;

[0024] And / or, the mildew inhibitor includes at least one of 8-hydroxyquinoline, 8-hydroxyquinolinone, pentachlorophenol, sodium pentachlorophenol, tetrachloro-4-(methylsulfonyl)pyridine, bis(tri-n-butyltin) oxide, and phenylmercuric acetate;

[0025] And / or, the antistatic agent is selected from the following categories of antistatic agents: one is a cationic antistatic agent selected from (3-laurylamidopropyl) trimethylammonium methyl sulfate (Cyastat-LS), dimethylhydroxyethyl stearylamide ethyl quaternary ammonium nitrate (SN), trihydroxyethyl methyl quaternary ammonium methyl sulfate (TM); one is an anionic antistatic agent selected from sodium p-nonyldiphenyl oxide sulfonate (NP), potassium p-nonyldiphenyl oxide sulfonate (DPE), sodium salt of higher alcohol phosphate diester, sodium butyrate sulfonate; one is a nonionic antistatic agent selected from fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, glycerol monofatty acid; one is a zwitterionic antistatic agent selected from alkyl dicarboxymethyl quaternary ammonium betaine, dodecyl dimethyl betaine; one is a polymer antistatic agent selected from ethylene oxide, propylene oxide adducts of ethylenediamine, octyl styrene and styrene sulfonic acid copolymer polysoap.

[0026] Based on the same technical concept, another solution of the present invention is to provide a method for preparing the plugging and fire control agent, the method comprising the following steps:

[0027] (I) Preparation of liquid component A:

[0028] (I-1) dehydrating the polyether at 110° C. and -0.6 to -0.8 MPa for 4 h to obtain a dry polyether;

[0029] (I-2) adding isocyanate into a reaction kettle, filling the kettle with nitrogen for protection, heating the reaction kettle, and dripping the dry polyether under stirring, controlling the reaction temperature to 60-70° C., and dripping for 1-3 hours;

[0030] After the addition of (I-3) is completed, the reaction temperature is controlled at 65-80°C and kept warm for 2.5-5 hours. The free isocyanate content is measured by sampling and is 16%. When the temperature is cooled to below 60°C, a semi-prepolymer of component A is obtained;

[0031] (I-4) adding polyisocyanate, auxiliary agent and diluent to make the free isocyanate content 15-25%, maintaining the viscosity at 25° C. at 200-700 mPa·s, and packing in barrels filled with nitrogen to obtain liquid component A;

[0032] (II) Preparation of liquid component B:

[0033] (II-1) grinding a dispersant, a flame retardant, a defoamer, a light stabilizer, an antioxidant, a pigment, a coupling agent, a rheological agent, a mildew preventer, an antistatic agent and part of the amino-terminated polyether to obtain a color paste mother solution;

[0034] (II-2) The color paste mother liquid, the remaining amino-terminated polyether and the chain extender are uniformly stirred, and then graded, dehydrated, filtered, and nitrogen-filled and packaged in sequence to obtain a liquid component B.

[0035] Based on the same technical concept, the present invention further provides an application of the above-mentioned blocking and control agent in blocking nuclear leakage hazards such as breaches and cracks.

[0036] Preferably, the application method is:

[0037] (1) Determine the emergency disposal targets, areas and environmental characteristics of the emergency disposal target areas for contamination and leakage according to the emergency response requirements for nuclear accidents;

[0038] (2) Select the operating machinery or equipment according to the environmental characteristics and task requirements. The task requirements are: liquid component A and liquid component B are mixed and atomized online at a certain volume ratio, sprayed 1 to 3 meters in front of the target area, and swung from left to right to evenly cover the breach. The ambient temperature is in the temperature range of -20 to 50°C, and the wind speed is less than level 4;

[0039] (3) According to the task requirements of step (2), the size of the target object and the density of 1.5 to 2.5 kg / m 2 Calculate the amount of sealing and control agent, and continuously spray the sealing and control agent onto the breach, fully covering the area within 10 cm in diameter of the breach. Quickly gel at the breach to form a copolymer film with good adhesion, and seal the nuclear equipment at the breach to force the toxic and harmful substances or radioactive substances in the container to gather inside the container, limiting outward release and diffusion. At the same time, the toxic and harmful substances or radioactive aerosols that have diffused in the target area collide, wetting, adsorption, copolymerization, and weight gain with the sealing and control agent, so that the diffused toxic and harmful substances quickly settle to the ground or the breach in the form of copolymer gel.

[0040] The beneficial effects of the present invention are:

[0041] The plugging and fire control agent of the present invention adopts a two-component polyurea system, and after mixing, it rapidly crosslinks to form a polyurea (-NH-CO-NH-) elastic coating, wherein component A is a small molecule or polymer (prepolymer) containing multiple (-NCO), and component B is a polymer or low molecular composition containing two or more terminal amino groups. It solves the problems of slow gelation, slow molding, and slow plugging of traditional spraying and casting polyurethanes in the process of achieving the plugging target, and also solves the limitations of most plugging functional materials on the use temperature and equipment. The plugging and fire control agent still has fluidity at a low temperature of 0°C. At the same time, it also overcomes the requirements of polyurethane plugging materials for air humidity, and the reaction speed with water vapor in the air is much lower than the reaction speed of components A and B, so it is not limited by air humidity and has a wide range of use. In addition, the viscosity of components A and B of the plugging and fire control agent of the present invention is relatively small, so long-distance spraying can be achieved, replacing manual spraying and close contact, reducing external irradiation of chemical defense personnel, and ensuring the safety of operators to a certain extent. Finally, the proportion of chain extender in component B can adjust the gel time according to different injection distances and the two-component reaction system of A and B (with different structures), without the need for a catalyst, to obtain better mechanical properties and plugging effects.

[0042] 2. The blocking and control agent of the present invention is sprayed to the target area when used, which realizes the rapid sealing of the breach, interrupts the continuous release of toxic and harmful substances, blocks the leakage and diffusion path of toxic and harmful radioactive aerosols, and minimizes the diffusion range and the scope of harm. The nuclear, biological and chemical hazardous substance blocking copolymer elastomer formed at the breach adheres well to the metal surface, and the elastomer has appropriate strength, which is suitable for the long-term storage and transportation of the equipment after disposal, and the scope of harm will not be expanded. It can effectively adsorb and settle toxic and harmful substances in the air, forcing it to form a non-flowing copolymer gel state with the control agent, which does not flow or penetrate after settling to the ground, and quickly reduces the concentration of toxic and harmful radioactive aerosols in the air of the target area, significantly reducing the pollution concentration in the air.

[0043] 3. The blocking and control agent of the present invention can gel and solidify quickly, is insensitive to humidity and temperature, is easy to operate, does not contain catalysts, can be applied on any curved surface, inclined surface and vertical surface without sagging; and has a solid content of 100%, a volatile organic compound content (VOC) of zero, meets environmental protection requirements, and has no secondary pollution. In addition, the nuclear, biological and chemical pollution blocking and decontamination copolymer film formed on the ground is a solid object that can be peeled and transferred, which is easy to collect, concentrate and dispose of, and has no hazards of radioactive wastewater storage and discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 This is a picture of the fluidity of the plugging and fire control agent at 0°C.

[0046] Figure 2 This is a picture of the gel effect of the plugging and fire control agent. DETAILED DESCRIPTION

[0047] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0048] Example 1

[0049] This embodiment provides a plugging and control agent, including a liquid component A and a liquid component B; wherein:

[0050] The liquid component A includes 40 g of isocyanate, 15 g of polyether, and 5 g of diluent.

[0051] The liquid component B includes 60g of terminal amino polyether, 5g of chain extender, 0.6g of dispersant, 2g of flame retardant, 0.2g of defoamer, 0.1g of light stabilizer, 0.1g of antioxidant, 0.1g of pigment, 0.5g of coupling agent, 2g of rheological agent, 0.1g of mildewproof agent and 2g of antistatic agent.

[0052] The isocyanate in the liquid component A is hexamethylene diisocyanate (HDI), the polyether is D-2000, and the diluent is dibutyl phthalate (DBP).

[0053] The amino-terminated polyether in liquid component B is D-2000 (accounting for 40g) and T-5000 (accounting for 20g), the chain extender is diethyltoluenediamine (DETDA or E-100), the dispersant is an alkyl quaternary ammonium salt, the flame retardant is tris(2-chloroisopropyl) phosphate (TCPP), the defoamer is tributyl phosphate, the light stabilizer is 2-hydroxy-4-methoxybenzophenone (UV-9), the antioxidant is 2,6-di-tert-butyl-4-methylphenol (BHT, referred to as antioxidant 264), the pigment is medium chrome yellow, the coupling agent is KH-550, the rheological agent is fumed silica, the mildew inhibitor is 8-hydroxyquinoline, and the antistatic agent is dimethylhydroxyethyl stearamide ethyl quaternary ammonium nitrate (SN).

[0054] According to Example 1, a small-area film-forming experiment was carried out. 3 to 6 circular holes with a diameter of 1 cm were cut on the side of a 200L dry metal barrel as the target area. A smoke-generating device was placed inside, and the smoke was used as a marker. The material prepared in Example 1 was sprayed onto the target object through a special application device, and the spraying amount was 2 kg / m 2 The environmental conditions are indoor environment, the temperature range is -20℃~25℃, the relative humidity range is 16%~36%, and there is no wind. After the spraying is completed, the time when the fire control agent does not flow, that is, the gel time, is measured to be 8s. There is no smoke leakage and overflow at the breach, and the copolymer film formed after drying has a good seal on the breach.

[0055] Example 2

[0056] This embodiment provides a plugging and control agent, including a liquid component A and a liquid component B; wherein:

[0057] The liquid component A includes 50 g of isocyanate, 12 g of polyether, and 15 g of diluent.

[0058] The liquid component B includes 70g of terminal amino polyether, 20g of chain extender, 0.8g of dispersant, 2g of flame retardant, 0.2g of defoamer, 0.2g of light stabilizer, 0.2g of antioxidant, 0.1g of pigment, 0.8g of coupling agent, 4g of rheological agent, 0.5g of mildewproof agent and 2g of antistatic agent.

[0059] The isocyanate in the liquid component A is isophorone diisocyanate (IPDI), the polyether is D-400, and the diluent is propylene carbonate (PC).

[0060] The amino-terminated polyether in liquid component B is D-2000 (45g) and T-5000 (25g), and the chain extender is diethyltoluenediamine (DETDA or E-100) and N,N-dialkylmethyldiamine (10g each), the dispersant is a specially modified polyaminoamide phosphate, the flame retardant is dimethyl methyl phosphate (DMMP), the defoaming agent is polypropylene glycol, the light stabilizer is 2-(2'-hydroxy-3',5'-dipentylphenyl) benzophenone (UV-531), the antioxidant is pentaerythritol tetrakis(4-hydroxy-3,5-tert-butylphenylpropionate) (referred to as antioxidant 1010), the pigment is phthalocyanine green; the coupling agent is KH-570, the rheological agent is fumed silica, the mildew inhibitor is pentachlorophenol, and the antistatic agent is alkylphenol polyoxyethylene ether.

[0061] According to Example 2, a small area blocking and fire control experiment was carried out. 3 to 6 circular holes with a diameter of 1 cm were cut on the side of a 200L dry metal barrel as the target area. A smoke generator was placed inside the barrel, and the smoke was used as a marker. The material prepared in Example 1 was sprayed onto the target object through a special application device, and the spraying amount was 2 kg / m 2 The environmental conditions are indoor environment, the temperature range is -20℃~25℃, the relative humidity range is 16%~36%, and there is no wind. After the spraying is completed, the time when the fire control agent does not flow, that is, the gel time, is measured to be 5s. There is no smoke leakage and overflow at the breach, and the copolymer film formed after drying has a good seal on the breach.

[0062] Example 3

[0063] This embodiment provides a plugging and control agent, including a liquid component A and a liquid component B; wherein:

[0064] The liquid component A includes 45 g of isocyanate, 15 g of polyether, and 10 g of diluent.

[0065] The liquid component B includes 65g of terminal amino polyether, 20g of chain extender, 0.5g of dispersant, 4g of flame retardant, 0.3g of defoamer, 0.5g of light stabilizer, 0.5g of antioxidant, 0.2g of pigment, 1.5g of coupling agent, 5g of rheological agent, 0.6g of mildewproof agent and 4g of antistatic agent.

[0066] The isocyanate in the liquid component A is modified MDI, the polyether is polyoxypropylene polyol (PPG), and the diluent is propylene carbonate (PC).

[0067] The terminal amino polyether in liquid component B is D-2000 (accounting for 40g), T-5000 (accounting for 15g), and D-400 (accounting for 10g), the chain extender is 2,4-diamino-3,5-dimethylthiochlorobenzene (TX-2), the dispersant is aminopropylamine dioleate quaternary ammonium salt, the flame retardant is N,N-di(2-hydroxypropyl)-2,4,6-tribromoaniline (BHTBA), the defoamer is tributyl phosphate, the light stabilizer is 2(2-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole (UV-328), the antioxidant is bis(β-3,5-di-tert-butyl-4-hydroxyphenylpropionic acid) hexanediol ester, the pigment is titanium dioxide, the coupling agent is titanate coupling agent, the rheological agent is oxidized polyethylene, the mildew inhibitor is sodium pentachlorophenol, and the antistatic agent is glycerol monofatty acid.

[0068] According to Example 3, a small area blocking and fire control experiment was carried out. 3 to 6 circular holes with a diameter of 1 cm were cut on the side of a 200L dry metal barrel as the target area. A smoke generator was placed inside the barrel, and the smoke was used as a marker. The material prepared in Example 1 was sprayed onto the target object through a special application device, and the spraying amount was 2 kg / m 2 The environmental conditions are indoor environment, the temperature range is -20℃~25℃, the relative humidity range is 16%~36%, and there is no wind. After the spraying is completed, the time when the fire control agent does not flow, that is, the gel time, is measured to be 10s. There is no smoke leakage and overflow at the breach, and the copolymer film formed after drying has a good seal on the breach.

[0069] Example 4

[0070] This embodiment provides a plugging and control agent, including a liquid component A and a liquid component B; wherein:

[0071] The liquid component A includes 60 g of isocyanate, 20 g of polyether, and 20 g of diluent.

[0072] The liquid component B includes 80g of terminal amino polyether, 25g of chain extender, 1.0g of dispersant, 5g of flame retardant, 0.3g of defoamer, 0.5g of light stabilizer, 0.5g of antioxidant, 0.3g of pigment, 1g of coupling agent, 4g of rheological agent, 1g of mildewproof agent and 3g of antistatic agent.

[0073] The isocyanate in the liquid component A is 2,4-toluene diisocyanate, the polyether is hydroxyl-terminated polybutadiene (HTPB), and the diluent is ethyl carbonate (EC).

[0074] The amino-terminated polyether in liquid component B is D-2000 (accounting for 40g), T-5000 (accounting for 20g), T-403 (accounting for 20g), and the chain extender is N,N-dialkylmethyldiamine The dispersant is polydimethylsiloxane, the flame retardant is 1,2-ethylenetetrakis(2-chloroethyl)diphosphate, the defoamer is tributyl phosphate, the light stabilizer is 2(2-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole (UV-328), the antioxidant is 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid octadecyl (abbreviated as antioxidant 1076), the pigment is carbon black, the coupling agent is titanate coupling agent and KH-570 (each accounting for 0.5 parts), the rheological agent is fumed silica, the mildew inhibitor is 8-hydroxyquinolinone, and the antistatic agent is trihydroxyethyl methyl quaternary ammonium methyl sulfate (TM).

[0075] According to Example 4, a small area blocking and fire control experiment was carried out. 3 to 6 circular holes with a diameter of 1 cm were cut on the side of a 200L dry metal barrel as the target area. A smoke generator was placed inside the barrel, and the smoke was used as a marker. The material prepared in Example 1 was sprayed onto the target object through a special application device, and the spraying amount was 2 kg / m 2 The environmental conditions are indoor environment, the temperature range is -20℃~25℃, the relative humidity range is 16%~36%, and there is no wind. After the spraying is completed, the time when the fire control agent does not flow, that is, the gel time, is measured to be 12s. There is no smoke leakage and overflow at the breach, and the copolymer film formed after drying has a good seal on the breach.

[0076] Test example

[0077] Figure 1 The fluidity photographs of the three groups of plugging and fire control agents obtained in Examples 1 to 3 at 0°C are shown. It can be seen from the figure that the fluidity of the plugging and fire control agents is good at 0°C.

[0078] Figure 2 This is a diagram showing the rapid gelation effect of the blocking and controlling agent obtained in Example 1 within 8 seconds. Figure 2 The left picture is a photo taken at time 0, and the right picture is a photo taken at 8s, and its rapid gelation effect is excellent.

[0079] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A plugging and fire control agent, characterized in that: It includes a liquid component A and a liquid component B; wherein: The liquid component A comprises the following raw materials in parts by weight: 35-60 parts of isocyanate, 10-20 parts of polyether, and 5-20 parts of diluent; The liquid component B includes the following raw materials in parts by weight: 60-80 parts of terminal amino polyether, 5-25 parts of chain extender, 0.4-1.2 parts of dispersant, 2-6 parts of flame retardant, 0.2-0.3 parts of defoamer, 0.1-0.5 parts of light stabilizer, 0.1-0.5 parts of antioxidant, 0.1-0.3 parts of pigment, 0.5-1.5 parts of coupling agent, 2-5 parts of rheological agent, 0.1-1 parts of mildewproof agent and 2-4 parts of antistatic agent.

2. The blocking and fire control agent according to claim 1, characterized in that: The liquid component A comprises the following raw materials in parts by weight: 40 parts of isocyanate, 15 parts of polyether, and 5 parts of diluent; The liquid component B includes the following raw materials in parts by weight: 60 parts of amino-terminated polyether, 5 parts of chain extender, 0.6 parts of dispersant, 2 parts of flame retardant, 0.2 parts of defoamer, 0.1 parts of light stabilizer, 0.1 parts of antioxidant, 0.1 parts of pigment, 0.5 parts of coupling agent, 2 parts of rheological agent, 0.1 parts of mildewproof agent and 2 parts of antistatic agent.

3. The blocking and controlling agent according to claim 1 or 2, characterized in that: The isocyanate includes at least one of an aliphatic isocyanate and an aromatic isocyanate; the aliphatic isocyanate includes at least one of hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, cyclohexane dimethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, tetramethylxylylene diisocyanate, and 1,4-butylene diisocyanate; the aromatic isocyanate includes at least one of diphenylmethane-4,4'-diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, liquefied diphenylmethane diisocyanate, 2,4-toluene diisocyanate, and 4,4'-diphenylpropane diisocyanate; And / or, the polyether includes at least one of a hydroxyl-terminated polyether and an amino-terminated polyether; the hydroxyl-terminated polyether includes at least one of polyoxypropylene polyol, hydroxyl-terminated polybutadiene, and hydroxyl-terminated polyethylene / butylene polymer; the amino-terminated polyether includes at least one of the difunctional D series polyethers D-230, D-400, D-2000, and D-4000 and the trifunctional T series polyethers T-403, T-3000, and T-5000; And / or, the diluent includes at least one of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, propyl carbonate and ethyl carbonate.

4. The blocking and fire control agent according to claim 1 or 2, characterized in that: The chain extender includes at least one of an aromatic chain extender and an aliphatic chain extender; the aromatic chain extender includes 3,3'-dichloro-4,4'-diaminodiphenylmethane, 3,3'-diethyl-4,4'-diaminodiphenylmethane, diethyltoluenediamine, 3,5-dimethylthiotoluenediamine, 2,4-diamino-3,5-dimethylthiochlorobenzene, 3-methylthio-5-propyl-2,4-toluenediamine, N,N-dialkylmethyldiamine, N,N-dialkylphenylenediamine, 4102, 4132, At least one of 4230; the aliphatic chain extender includes IPDA, Clearlink TM 1000、Clearlink TM 3000、Versalink TM 650、Versalink TM 1000、Jefflink TM 555. Jefflink TM 754. Jefflink TM At least one of 7027; And / or, the dispersant includes a cationic surfactant, an anionic surfactant or a non-polar surfactant; the cationic surfactant includes at least one of alkyl quaternary ammonium salts, aminopropylamine dioleate quaternary ammonium salts, and specially modified polyaminoamide phosphates; the anionic surfactant includes at least one of sodium oleate, sulfate ester salts, sulfonates, and phosphate ester salts; the non-polar surfactant includes at least one of polyethyleneimine derivatives, polydimethylsiloxane, and modified silicone polymers; And / or, the flame retardant includes at least one of tris(2-chloroethyl) phosphate, tris(2-chloroisopropyl) phosphate, dimethyl methyl phosphate, 1,2-ethylenetetrakis(2-chloroethyl) diphosphate, tetrakis(2-chloroethyl)ethoxy diphosphate, tetrakis(1,3-dichloro-2-propyl)-1,2-ethylene diphosphate, N,N-bis(2-hydroxypropyl)-2,4,6-tribromoaniline, triphenyl phosphate, polyphosphate amine, and chlorinated paraffin; And / or, the defoaming agent includes at least one of polypropylene glycol, tributyl phosphate, isopropanol, and n-butanol.

5. The blocking and fire control agent according to claim 1 or 2, characterized in that: The light stabilizer includes at least one of 2-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzophenone, 2(2-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, and UV-119s; And / or, the antioxidant includes at least one of 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis(4-hydroxy-3,5-tert-butylphenylpropionate), octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, tris(nonylphenyl) phosphite, phenothiazine, bis(β-3,5-di-tert-butyl-4-hydroxyphenylpropionate), and triphenyl phosphate; And / or, the pigment includes at least one of red powder, medium chrome yellow, phthalocyanine green, carbon black, and titanium dioxide; And / or, the coupling agent includes at least one of KH-550, KH-560, KH-570, a titanate coupling agent, and an organic chromium coupling agent.

6. The blocking and fire control agent according to claim 1 or 2, characterized in that: The rheological agent includes at least one of soluble hydrogenated castor oil, oxidized polyethylene, and fumed silica; And / or, the mildew inhibitor includes at least one of 8-hydroxyquinoline, 8-hydroxyquinolinone, pentachlorophenol, sodium pentachlorophenol, tetrachloro-4-(methylsulfonyl)pyridine, bis(tri-n-butyltin) oxide, and phenylmercuric acetate; And / or, the antistatic agent includes a cationic antistatic agent, an anionic antistatic agent, a nonionic antistatic agent, a zwitterionic antistatic agent or a polymer antistatic agent; the cationic antistatic agent includes at least one of (3-laurylamidopropyl)trimethylammonium methyl sulfate, dimethylhydroxyethyl stearamide substituted ethyl quaternary ammonium nitrate, and trihydroxyethyl methyl quaternary ammonium methyl sulfate; the anionic antistatic agent includes at least one of sodium p-nonyldiphenyl oxide sulfonate, potassium p-nonyldiphenyl oxide sulfonate, sodium salt of higher alcohol phosphate diester, and sodium butyrate sulfonate; the nonionic antistatic agent includes at least one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and glycerol monofatty acid; the zwitterionic antistatic agent includes at least one of alkyl dicarboxymethyl quaternary ammonium betaine and dodecyl dimethyl betaine; the polymer antistatic agent includes at least one of ethylene oxide, propylene oxide adducts of ethylenediamine, octyl styrene, and styrene sulfonic acid copolymer polysoap.

7. The method for preparing the blocking and fire control agent according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: (I) Preparation of liquid component A: (I-1) dehydrating the polyether at 110° C. and -0.6 to -0.8 MPa for 4 h to obtain a dry polyether; (I-2) adding isocyanate into a reaction kettle, filling the kettle with nitrogen for protection, heating the reaction kettle, and dripping the dry polyether under stirring, controlling the reaction temperature to 60-70° C., and dripping for 1-3 hours; After the addition of (I-3) is completed, the reaction temperature is controlled at 65-80°C and kept warm for 2.5-5 hours. The free isocyanate content is measured by sampling and is 16%. When the temperature is cooled to below 60°C, a semi-prepolymer of component A is obtained; (I-4) adding polyisocyanate, auxiliary agent and diluent to make the free isocyanate content 15-25%, maintaining the viscosity at 25° C. at 200-700 mPa·s, and packing in barrels filled with nitrogen to obtain liquid component A; (II) Preparation of liquid component B: (II-1) grinding a dispersant, a flame retardant, a defoamer, a light stabilizer, an antioxidant, a pigment, a coupling agent, a rheological agent, a mildew preventer, an antistatic agent and part of the amino-terminated polyether to obtain a color paste mother solution; (II-2) The color paste mother liquid, the remaining amino-terminated polyether and the chain extender are uniformly stirred, and then graded, dehydrated, filtered, and nitrogen-filled and packaged in sequence to obtain a liquid component B.

8. Use of the blocking and control agent according to any one of claims 1 to 6 in blocking nuclear leakage hazards such as cracks and fissures.

9. The use according to claim 8, characterized in that: The method of application is: (1) Determine the emergency disposal targets, areas and environmental characteristics of the emergency disposal target areas for contamination and leakage according to the emergency response requirements for nuclear accidents; (2) Select the operating machinery or equipment according to the environmental characteristics and task requirements. The task requirements are: liquid component A and liquid component B are mixed and atomized online at a certain volume ratio, sprayed 1 to 3 meters in front of the target area, and swung from left to right to evenly cover the breach. The ambient temperature is in the temperature range of -20 to 50°C, and the wind speed is less than level 4; (3) According to the task requirements of step (2), the size of the target object and the density of 1.5 to 2.5 kg / m 2 Calculate the amount of sealing and control agent, and continuously spray the sealing and control agent onto the breach, fully covering the area within 10 cm in diameter of the breach. Quickly gel at the breach to form a copolymer film with good adhesion, and seal the nuclear equipment at the breach to force the toxic and harmful substances or radioactive substances in the container to gather inside the container, limiting outward release and diffusion. At the same time, the toxic and harmful substances or radioactive aerosols that have diffused in the target area collide, wetting, adsorption, copolymerization, and weight gain with the sealing and control agent, so that the diffused toxic and harmful substances quickly settle to the ground or the breach in the form of copolymer gel.

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