A radiation-resistant low-volume macroporous oil-absorbing resin and a preparation method thereof

Abstract

The invention discloses a radiation-resistant low-volume macroporous oil-absorbing resin and a preparation method thereof, belonging to the technical field of new materials for polymer polymerization, and is prepared from the following raw materials: 80-95 parts of monomers; 0.05-1 parts of initiators; 0.01-0.1 parts of cross-linking agents; 0.05-3 parts of porogens; 0.01-5 parts of radiation-resistant additives; 5-10 parts of dispersants; and 200-500 parts of deionized water. The invention adds more abundant lipophilic groups to the resin through the selection and proportioning of olefin monomers, which can effectively absorb organic liquids containing radioactive elements, and the mixed cross-linking agent adds a variety of three-dimensional network structures to the inside of the resin, effectively coating the radioactive organic waste liquid, so that the oil-absorbing resin material has a small volume increase; at the same time, the composite porogen forms a variety of pores inside and on the surface of the resin, providing a path for the entry of organic liquids, accelerating the kinetic reaction process, and being conducive to further reducing the volume increase.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials for polymer polymerization, and specifically relates to a nuclear radiation waste liquid treatment technology in the nuclear energy industry, and in particular to a radiation-resistant low-volume macroporous oil-absorbing resin and a preparation method thereof. Background Art

[0002] Nuclear power generation, as a new type of efficient green energy, has experienced more than 60 years of development and has become the main source of electricity in many developed countries. The radioactive waste generated by nuclear power projects, such as radioactive organic waste liquid, has become an important factor restricting the development of nuclear power. 3 H. 235 U. 239 Pu, 137 Cs, 90 Sr. 60 Co and other radionuclides.

[0003] There are few methods for treating radioactive organic waste liquid at present. The main methods abroad include incineration treatment, wet oxidation, absorption solidification, etc. In the process of incineration treatment, a large amount of difficult-to-treat flue gas will be generated, leading to strong corrosion, blockage and other problems, and the critical safety and radioactive leakage issues need to be considered in the process, which has high requirements for equipment processing and manufacturing; wet oxidation decomposes organic waste liquid into carbon dioxide and water, leaving inorganic residues, with complex processes and high requirements for equipment, and radioactive inorganic residues need to be solidified and disposed; absorption solidification method uses traditional solidification materials such as clay, diatomaceous earth, vermiculite powder, cement, etc. or uses absorption resin to absorb organic waste liquid into the interior of the polymer to form a stable absorption solid body, but all of them have the disadvantage of large volume expansion. For example, the volume expansion ratio of traditional solidification materials such as clay, diatomaceous earth, vermiculite powder, and cement can reach 500%, and large volume expansion will increase the difficulty of subsequent transportation and disposal, leading to safety and cost issues. Summary of the invention

[0004] Based on the problem that the absorbent resin used in the treatment of radioactive organic waste liquid in the prior art has too large a capacity increase, the present invention provides a radiation-resistant low-volume-increase macroporous oil-absorbing resin and a preparation method thereof. To this end, the present invention adopts the following technical solutions:

[0005] First, the present invention provides a radiation-resistant low-volume macroporous oil-absorbing resin, which is made of the following raw materials in parts by weight:

[0006] 80-95 parts of monomer;

[0007] Initiator 0.05-1 part;

[0008] Cross-linking agent 0.01-0.1 part;

[0009] Porogen 0.05-3 parts;

[0010] 0.01-5 parts of anti-radiation additives;

[0011] Dispersant 5-10 parts;

[0012] 200-500 parts of deionized water.

[0013] Further, the olefin monomer is any one of alkylstyrene, olefin, ester styrene, ester olefin or a mixture of two or more thereof; further, the olefin monomer includes at least alkylstyrene and one or more thereof of olefin, ester styrene and ester olefin; based on the total mass of the olefin monomer, the mass percentage of alkylstyrene is 50%-90%, and the mass percentage of one or more thereof of olefin, ester styrene and ester olefin is 10%-50%, so as to form a sufficient three-dimensional space to accommodate the absorbent. The alkylstyrene is a C8-C20 straight-chain alkyl-substituted styrene, preferably p-dodecylstyrene, the olefin is myrcene, the ester styrene is 4-vinylphenyl acetate, and the ester olefin is trimethylvinyl acetate.

[0014] The mass composition of the vinyl monomers may be: alkyl styrene accounts for 50%-90%, and at least one of olefin, ester styrene and ester olefin accounts for 10%-50%.

[0015] Furthermore, the initiator is preferably benzoyl peroxide.

[0016] Further, the crosslinking agent is preferably a mixture of any one or more of styrene and C1-C6 alkyl-substituted styrene in proportion; the C1-C6 alkyl group may be straight chain or branched chain, preferably straight chain; the C1-C6 alkyl substituent may be ortho-, meta- or para-substituted, preferably para-substituted. More preferred C1-C6 alkyl-substituted styrenes include 4-methylstyrene, 4-ethylstyrene, 4-isopropylstyrene, 4-tert-butylstyrene, and the like.

[0017] Furthermore, the porogen is preferably at least one of liquid paraffin, n-heptane and n-hexadecane, and the amount is preferably 1-3 parts. The porogen of the present invention allows the formed pores to absorb faster and accommodate more macromolecules.

[0018] Furthermore, the anti-radiation additive is preferably nano zinc oxide, nano lead oxide, micron antimony pentasulfide, micron barium sulfate, and the amount thereof is preferably 1-5 parts. In the present invention, the selection of olefin monomers and the process of initiating polymerization and cross-linking enable the polymerized resin material to absorb organic liquids containing radioactive elements, which have radiation resistance characteristics, and the anti-radiation additive can synergistically enhance the radiation resistance function. In the suspension polymerization process of the present invention, the olefin monomer can also be used as a solvent to dissolve the organic phase.

[0019] Furthermore, the dispersant is preferably at least one of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and carboxymethyl cellulose.

[0020] The present invention also provides a method for preparing the above-mentioned radiation-resistant macroporous oil-absorbing resin, comprising the following steps:

[0021] (1) Dissolution of aqueous phase: Add the dispersant and part of deionized water into the stirring tank A, stir and treat to obtain aqueous phase liquid; the mass of deionized water is 30-60 times the mass of the dispersant;

[0022] (2) Dissolving the organic phase: adding the vinyl monomer, initiator, crosslinking agent, porogen and radiation-resistant additive into the stirred tank B and stirring to obtain an organic phase liquid;

[0023] (3) Reaction: Add the aqueous phase feed liquid and the organic phase feed liquid into a reactor, then add the remaining deionized water, stir and treat to obtain a suspension, fill the reactor with nitrogen, then heat to 60-90°C, and carry out suspension polymerization for 8-15 hours to obtain a reaction solid-liquid mixture; during the reaction, nitrogen is filled to maintain a slight positive pressure to isolate oxygen, which is conducive to the anaerobic polymerization reaction;

[0024] (4) Cleaning: The reaction solid-liquid mixture is cooled to room temperature, the gas phase in the reactor is cooled and liquefied by a condenser and then refluxed into the reactor, the non-condensable gas is vented, the solid phase in the reaction solid-liquid mixture is filtered out, and the obtained solid phase is cleaned;

[0025] (5) Pore formation: the cleaned solid phase product is placed in anhydrous ethanol, ultrasonically backwashed, and the porogen is backwashed into the ethanol to obtain a macroporous resin;

[0026] (6) Drying: The macroporous resin is placed in a centrifugal dryer and centrifugally dried at 70-90° C. for 2-6 hours to obtain the radiation-resistant macroporous oil-absorbing resin.

[0027] The invention provides a radiation-resistant macroporous oil-absorbing resin with low volume expansion and a preparation method thereof. The method adds more abundant lipophilic groups to the resin through the selection and proportion of olefin monomers, which can effectively absorb organic liquids containing radioactive elements, and the cross-linking agent adds a variety of three-dimensional network structures to the inside of the resin, effectively encapsulating the radioactive organic waste liquid, so that the volume expansion of the oil-absorbing resin material is relatively small; at the same time, the porogen forms a variety of pores inside and on the surface of the resin, providing a path for the entry of organic liquids, accelerating the kinetic reaction process, and being conducive to further reducing the volume expansion, and is particularly suitable for treating organic waste liquids containing radioactive elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1The absorption experiment of TBP / kerosene by using the resin of the present invention and the comparison diagram of the state before and after absorption (the left figure is before absorption, and the right figure is after absorption). It can be seen that the capacity increase changes very little after absorption and curing. DETAILED DESCRIPTION

[0029] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0030] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0031] p-Dodecylstyrene, 96%, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0032] Myrcene, ≥90.0% (GC), was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0033] 4-Vinylphenyl acetate, 97%, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0034] Trimethylvinyl acetate, 99%, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0035] Benzoyl peroxide, AR, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0036] 4-Methylstyrene, 99%, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0037] Liquid paraffin, light density: 0.84-0.86 was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0038] Nano zinc oxide, 99.9% metals basis, 30±10nm;

[0039] Methylcellulose, gel strength ~100 g Bloom was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0040] Example 1

[0041] Preparation of radiation-resistant macroporous oil-absorbing resin:

[0042] In this embodiment, the raw materials are as follows, by mass: 45 parts of p-dodecyl styrene; 35 parts of myrcene, 10 parts of trimethyl vinyl acetate; 0.8 parts of benzoyl peroxide; 0.05 parts of 4-methylstyrene; 2 parts of liquid paraffin; 3 parts of nano zinc oxide; 8 parts of methyl cellulose; and 500 parts of deionized water.

[0043] The preparation method comprises the following steps:

[0044] (1) Dissolution in aqueous phase: Add methyl cellulose and 50 times its mass of deionized water into a stirred tank A, and stir at a speed of 500 r / min for 1 h until fully dissolved to obtain an aqueous phase liquid;

[0045] (2) Dissolving the organic phase: Add p-dodecylstyrene, myrcene, trimethylacetic acid vinyl ester, benzoyl peroxide, 4-methylstyrene, liquid paraffin and nano zinc oxide into a stirred tank B, and stir at a speed of 500 r / min for 60 min to obtain an organic phase feed liquid;

[0046] (3) Reaction: Add the aqueous phase feed liquid and the organic phase feed liquid into a reactor, then add the remaining deionized water, and stir at a speed of 200 r / min for 30-90 min to disperse the organic phase into uniform spherical suspension droplets in the aqueous phase to obtain a suspension. Fill the reactor with nitrogen to a slight positive pressure, then heat to 80°C and perform suspension polymerization for 10 h to obtain a reaction solid-liquid mixture;

[0047] (4) Cleaning: The reaction solid-liquid mixture is cooled to room temperature, the gas phase in the reactor is cooled and liquefied by a condenser and then refluxed into the reactor, the non-condensable gas (mainly nitrogen) is vented, the solid phase in the reaction solid-liquid mixture is filtered out, and washed with water until there is no obvious smell;

[0048] (5) Pore formation: The cleaned solid phase product is placed in anhydrous ethanol (just cover it), and ultrasonically backwashed at 60°C for 60-120 min to backwash the porogen into ethanol to obtain a macroporous resin;

[0049] (6) Drying: The macroporous resin is placed in a centrifugal dryer and centrifugally dried at 80° C. for 4 hours to obtain the radiation-resistant macroporous oil-absorbing resin.

[0050] Example 2

[0051] Preparation of radiation-resistant macroporous oil-absorbing resin

[0052] In this embodiment, the raw materials are as follows, by mass: 55 parts of p-dodecyl styrene; 10 parts of myrcene, 30 parts of trimethyl vinyl acetate, 0.5 parts of benzoyl peroxide; 0.02 parts of 4-methylstyrene; 1 part of liquid paraffin; 1 part of nano zinc oxide; 4 parts of methyl cellulose; and 300 parts of deionized water.

[0053] The preparation method comprises the following steps:

[0054] (1) Dissolution in aqueous phase: Add methyl cellulose and 50 times its mass of deionized water into a stirred tank A, and stir at a speed of 500 r / min for 1 h until fully dissolved to obtain an aqueous phase liquid;

[0055] (2) Dissolving the organic phase: Add p-dodecylstyrene, myrcene, trimethylacetic acid vinyl ester, benzoyl peroxide, 4-methylstyrene, liquid paraffin and nano zinc oxide into a stirred tank B, and stir at a speed of 500 r / min for 30 min to obtain an organic phase feed liquid;

[0056] (3) Reaction: Add the aqueous phase feed liquid and the organic phase feed liquid into a reactor, then add the remaining deionized water, and stir at a speed of 200 r / min for 30-90 min to disperse the organic phase into uniform spherical suspension droplets in the aqueous phase to obtain a suspension. Fill the reactor with nitrogen to a slight positive pressure, then slowly heat to 60°C, and carry out a suspension polymerization reaction for 15 hours to obtain a reaction solid-liquid mixture;

[0057] (4) Cleaning: The reaction solid-liquid mixture is cooled to room temperature, the gas phase in the reactor is cooled and liquefied by a condenser and then refluxed into the reactor, the non-condensable gas (mainly nitrogen) is vented, the solid phase in the reaction solid-liquid mixture is filtered out, and washed with water until there is no obvious smell;

[0058] (5) Pore formation: The cleaned solid phase product is placed in anhydrous ethanol (just cover it), backwashed by ultrasound, and the porogen is backwashed into ethanol to obtain a macroporous resin;

[0059] (6) Drying: The macroporous resin is placed in a centrifugal dryer and centrifugally dried at 80° C. for 4 hours to obtain the radiation-resistant macroporous oil-absorbing resin.

[0060] Example 3

[0061] Preparation of radiation-resistant macroporous oil-absorbing resin

[0062] In this embodiment, the raw materials are as follows, by mass: 80 parts of p-dodecyl styrene; 10 parts of myrcene, 5 parts of 4-vinylphenyl acetate; 1 part of benzoyl peroxide; 0.1 part of 4-methylstyrene; 3 parts of liquid paraffin; 5 parts of nano zinc oxide; 10 parts of methyl cellulose; and 500 parts of deionized water.

[0063] The preparation method comprises the following steps:

[0064] (1) Dissolution in aqueous phase: Add methyl cellulose and 40 times its mass of deionized water into a stirred tank A, and stir at a speed of 500 r / m for 1 h until fully dissolved to obtain an aqueous phase liquid;

[0065] (2) Dissolving the organic phase: adding p-dodecylstyrene, myrcene, 4-vinylphenyl acetate, benzoyl peroxide, 4-methylstyrene, liquid paraffin and nano zinc oxide into a stirred tank B, stirring at a speed of 500 r / min for 90 min to obtain an organic phase feed liquid;

[0066] (3) Reaction: Add the aqueous phase feed liquid and the organic phase feed liquid into a reactor, then add the remaining deionized water, and stir at a speed of 200 r / min for 30-90 min to disperse the organic phase into uniform spherical suspension droplets in the aqueous phase to obtain a suspension. Fill the reactor with nitrogen to a slight positive pressure, then slowly heat to 90°C, and carry out a suspension polymerization reaction for 8 hours to obtain a reaction solid-liquid mixture;

[0067] (4) Cleaning: The reaction solid-liquid mixture is cooled to room temperature, the gas phase in the reactor is cooled and liquefied by a condenser and then refluxed into the reactor, the non-condensable gas (mainly nitrogen) is vented, the solid phase in the reaction solid-liquid mixture is filtered out, and washed with water until there is no obvious smell;

[0068] (5) Pore formation: The cleaned solid phase product is placed in anhydrous ethanol (just cover it), backwashed by ultrasound, and the porogen is backwashed into ethanol to obtain a macroporous resin;

[0069] (6) Drying: The macroporous resin is placed in a centrifugal dryer and centrifugally dried at 80° C. for 4 hours to obtain the radiation-resistant macroporous oil-absorbing resin.

[0070] Comparative Example 1

[0071] The formulation and preparation method of this comparative example are the same as those of Example 1, except that the raw material porogen liquid paraffin and the pore-forming process in step (5) are omitted.

[0072] Comparative Example 2

[0073] The formula and preparation method of this comparative example are the same as those of Example 1, except that the raw material anti-radiation additive nano zinc oxide is omitted.

[0074] Comparative Example 3

[0075] The formula and preparation method of this comparative example are the same as those of Example 1, except that trimethyl vinyl acetate and myrcene are omitted from the monomers and 90 parts of p-dodecylstyrene are used.

[0076] Comparative Example 4

[0077] The formula and preparation method of this comparative example are the same as those of Example 1, except that p-dodecylstyrene and myrcene are omitted from the monomers and 90 parts of trimethylvinyl acetate are used.

[0078] Comparative Example 5

[0079] The formula and preparation method of this comparative example are the same as those of Example 1, except that 30 parts of p-dodecylstyrene and 60 parts of myrcene are selected as monomers.

[0080] Comparative Example 6

[0081] The formula and preparation method of this comparative example are the same as those of Example 1, except that 40 parts of p-dodecylstyrene and 50 parts of 4-vinylphenyl acetate are used as monomers.

[0082] Application example 1: Dynamic absorption experiment

[0083] Weigh 5 g of the resin prepared in the above examples and comparative examples, 5 g of clay, diatomaceous earth, vermiculite powder, and cement respectively, and load them into a chromatography column, and record the total mass a and volume v1;

[0084] Measure 100 g of TBP / kerosene (TBP / kerosene is a typical extractant, generally used to characterize absorption tests) and add it to the chromatography column. After the TBP / kerosene is completely filtered out from the bottom of the chromatography column and no TBP / kerosene drips out, record the total mass b and volume v2 of the chromatography column; record the time t for complete absorption and solidification respectively; the experimental results are shown in Table 1.

[0085] Saturation absorption = (ba) / 5;

[0086] Capacity increase ratio = (v2-v1) / v1.

[0087] Table 1

[0088]

[0089] It can be concluded from the data in Table 1 that, compared with the traditional solidifying materials such as clay, diatomaceous earth, vermiculite powder and cement, the resin absorption capacity of Examples 1-3 of the present invention is significantly improved, and TBP / kerosene can be quickly solidified, and the absorption time is also significantly reduced. In particular, after the present invention absorbs and solidifies TBP / kerosene, the volume expansion ratio is also significantly reduced.

[0090] In addition, the product of the present invention has an extremely high saturated absorption capacity before and after pore formation. The resin obtained by pore formation in Examples 1-3 has significantly improved TBP kerosene absorption. After the pore formation process was omitted in Comparative Example 1, the absorption of TBP kerosene by the resin was significantly reduced, but its capacity increase was still lower than that of other comparative example resins and traditional curing materials. At the same time, it can be seen from Example 1 and Comparative Examples 3-4 that the absorption capacity of the resin obtained by using only a single type of olefin monomer is lower than that of Example 1, and the volume increase ratio is also higher than that of Example 1, but it is still much lower than the volume increase ratio of traditional curing materials. Furthermore, it can be seen from Example 1 and Comparative Examples 5-6 that although a combination of two monomers is used, the absorption capacity of the obtained resin is reduced due to insufficient monomer ratio and too little alkyl styrene monomer, but the volume increase ratio is still much lower than that of traditional curing materials.

[0091] Application example 2: Radiation resistance test

[0092] Take 5g of each of the resin products obtained in Examples 1-3 and Comparative Example 2 and use 60Co radiation source was used for irradiation experiment. The irradiation dose rate was set to 3 kGy / h and the cumulative irradiation dose was set to 220 kGy. Then the irradiated samples were loaded into the chromatography column and the steps of the dynamic absorption experiment were repeated. The experimental results are shown in Table 2.

[0093] Saturation absorption = (ba) / 5.

[0094] Table 2

[0095]

[0096] It can be concluded from the data in Table 2 that the absorption amount of the resins of Examples 1-3 of the present invention before and after irradiation is not much different, indicating that the added nano zinc oxide radiation-resistant additive greatly improves the radiation resistance of the resin, and still has a high absorption amount after irradiation. Omitting nano zinc oxide will greatly reduce its absorption of TBP kerosene, but the overall absorption effect is still better than that of many other comparative example resins and traditional curing materials when not irradiated.

[0097] like Figure 1 The comparison diagram of the resin in the absorption test equipment and before and after absorption of Example 1 shows that during the absorption of TBP kerosene, the resin has little capacity increase.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A radiation-resistant low-volume macroporous oil-absorbing resin, characterized in that: Made from the following raw materials in parts by weight: 80-95 parts of vinyl monomer; Initiator 0.05-1 part; Cross-linking agent 0.01-0.1 part; Porogen 0.05-3 parts; 0.01-5 parts of anti-radiation additives; Dispersant 5-10 parts; 200-500 parts of deionized water; The olefin monomers include at least alkyl styrene, and also include one or more of olefin, ester styrene, and ester olefin; the alkyl styrene is p-dodecyl styrene, the olefin is myrcene, the ester styrene is 4-vinylphenyl acetate, and the ester olefin is trimethylvinyl acetate; Based on the total mass of olefin monomers, the mass percentage of alkyl styrene is 50%-90%, and the mass percentage of one or more of olefin, ester styrene and ester olefin is 10%-50%; the cross-linking agent is any one of styrene and C1-C6 alkyl substituted styrene or a mixture of two or more; the anti-radiation additive is at least one of nano zinc oxide, nano lead oxide, micron antimony pentasulfide and micron barium sulfate.

2. The radiation-resistant low-volume macroporous oil-absorbing resin according to claim 1, characterized in that: The initiator is benzoyl peroxide.

3. The radiation-resistant low-volume macroporous oil-absorbing resin according to claim 1, characterized in that: The porogen is at least one of liquid paraffin, n-heptane and n-hexadecane.

4. The radiation-resistant low-volume macroporous oil-absorbing resin according to claim 1, characterized in that: The dispersant is at least one of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and carboxymethyl cellulose.

5. The method for preparing the radiation-resistant low-volume macroporous oil-absorbing resin according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Dissolution of aqueous phase: Add the dispersant and part of deionized water into the stirring tank A, stir and treat to obtain aqueous phase liquid; the mass of deionized water is 30-60 times the mass of the dispersant; (2) Dissolving the organic phase: adding the vinyl monomer, initiator, crosslinking agent, porogen and radiation-resistant additive into the stirred tank B and stirring to obtain an organic phase liquid; (3) Reaction: Add the aqueous phase feed liquid and the organic phase feed liquid into a reactor, then add the remaining deionized water, stir and treat to obtain a suspension, fill the reactor with nitrogen, then heat to 60-90° C., and carry out suspension polymerization reaction for 8-15 hours to obtain a reaction solid-liquid mixture; (4) Cleaning: The reaction solid-liquid mixture is cooled to room temperature, the gas phase in the reactor is cooled and liquefied by a condenser and then refluxed into the reactor, the non-condensable gas is vented, the solid phase in the reaction solid-liquid mixture is filtered out, and the obtained solid phase is cleaned; (5) Pore formation: the cleaned solid phase product is placed in anhydrous ethanol, ultrasonically backwashed, and the porogen is backwashed into ethanol to obtain a macroporous resin; (6) Drying: The macroporous resin is placed in a centrifugal dryer and centrifugally dried at 70-90° C. for 2-6 hours to obtain the radiation-resistant macroporous oil-absorbing resin.

6. Use of the radiation-resistant low-volume expansion macroporous oil-absorbing resin according to any one of claims 1 to 4 or the radiation-resistant low-volume expansion macroporous oil-absorbing resin obtained by the preparation method according to claim 5 in the treatment of nuclear radiation waste liquid.

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