CN115059456B - Degradable radioisotope tracer and preparation method thereof - Google Patents
Degradable radioisotope tracer and preparation method thereof Download PDFInfo
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- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000463 material Substances 0.000 claims description 63
- 238000005507 spraying Methods 0.000 claims description 21
- 229910021536 Zeolite Inorganic materials 0.000 claims description 18
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000010457 zeolite Substances 0.000 claims description 18
- 239000011324 bead Substances 0.000 claims description 16
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 239000002216 antistatic agent Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000049 pigment Substances 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 229920002472 Starch Polymers 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000008107 starch Substances 0.000 claims description 7
- 235000019698 starch Nutrition 0.000 claims description 7
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- -1 polybutylene succinate Polymers 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 5
- 239000001913 cellulose Substances 0.000 claims description 5
- 239000004631 polybutylene succinate Substances 0.000 claims description 5
- 229920002961 polybutylene succinate Polymers 0.000 claims description 5
- 229920001610 polycaprolactone Polymers 0.000 claims description 5
- 239000004632 polycaprolactone Substances 0.000 claims description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000007792 addition Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 3
- 239000004626 polylactic acid Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 2
- 229920001353 Dextrin Polymers 0.000 claims description 2
- 239000004375 Dextrin Substances 0.000 claims description 2
- 241000521257 Hydrops Species 0.000 claims description 2
- 229920000881 Modified starch Polymers 0.000 claims description 2
- 239000004368 Modified starch Substances 0.000 claims description 2
- 206010030113 Oedema Diseases 0.000 claims description 2
- 235000019425 dextrin Nutrition 0.000 claims description 2
- 239000001023 inorganic pigment Substances 0.000 claims description 2
- 235000019426 modified starch Nutrition 0.000 claims description 2
- 239000012860 organic pigment Substances 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims 3
- 150000002148 esters Chemical class 0.000 claims 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 239000011148 porous material Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000011435 rock Substances 0.000 abstract description 5
- 239000003086 colorant Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 22
- 230000002285 radioactive effect Effects 0.000 description 18
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000033558 biomineral tissue development Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 102000003779 Dipeptidyl-peptidases and tripeptidyl-peptidases Human genes 0.000 description 2
- 108090000194 Dipeptidyl-peptidases and tripeptidyl-peptidases Proteins 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- ZMKVBUOZONDYBW-UHFFFAOYSA-N 1,6-dioxecane-2,5-dione Chemical compound O=C1CCC(=O)OCCCCO1 ZMKVBUOZONDYBW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
- E21B47/111—Locating fluid leaks, intrusions or movements using tracers; using radioactivity using radioactivity
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
Aiming at the technical problems that the existing radioisotope tracer is not strong in degradability, the tracer can influence the pore of a water injection layer rock stratum and even can block the pore, the invention provides the degradable radioisotope tracer and the preparation method thereof, the prepared degradable radioisotope tracer can be degraded in 1-24 months under natural conditions, is not easy to naturally migrate into the environment, is easy to protect in the production process, is not easy to desorb in the tracer, has mild preparation conditions and low equipment manufacturing difficulty, can distinguish tracers with different densities and purposes by utilizing colors, and the like, and the density of the prepared degradable radioisotope tracer can be adjusted in a larger range to meet the requirements of different logging conditions.
Description
Technical Field
The invention belongs to the field of petroleum well logging, relates to an isotope tracer and a preparation method thereof, and particularly relates to a degradable radioisotope tracer and a preparation method thereof.
Background
The radioactive isotope tracer used for the injection profile logging of the radioactive isotope tracer method is solid spherical particles, and the logging principle is as follows: the radioisotope solid tracer is injected into water by a releaser and moves along with the water, when the radioisotope solid tracer reaches a water absorption layer, the injected water enters the stratum, the tracer stays on the surface of the water absorption layer, the gamma ray intensity emitted by the tracer is detected by an instrument, and the injection profile condition can be obtained through calculation. It is generally believed that when the radioisotope tracer reaches the water-absorbing layer from above the water-absorbing layer, a tracer having the same or a larger density than the injected water should be selected, and when the radioisotope tracer reaches the water-absorbing layer from below the water-absorbing layer by a upward return manner, a tracer having the same or a smaller density than the injected water should be selected. The mineralization degree of the injected water also influences the selection of the tracer, the tracer with higher mineralization degree should be selected with a bit higher density, and the tracer with lower mineralization degree should be selected with a bit lower density.
The radioactive isotope tracer for the injection profile well logging of the isotope tracing method is usually prepared by adopting the method disclosed in Chinese patent No. 201110057628.1, the carrier for carrying the isotope in early stage is usually silica gel or active carbon, the two carriers have strong adsorption capacity to the isotope, but have higher density, the prepared tracer has higher density, the tracer is suitable for the injection well, and when the tracer is required to rise to a water absorption layer along with water during the well logging and returning, some difficulties can occur, and the density is required to be equal to or slightly lower than that of the carrier for injecting water. The method for the density-controllable carrier disclosed in the prior art realizes the controllable adjustment of the carrier density, so that the density adjustment of the radioactive isotope tracer is free from the single mode of surface modification, and the density adjustment range is larger. By utilizing the prior art, the radioisotope tracer meeting different logging conditions and meeting market requirements can be obtained. With the increasing awareness of society of environmental protection, some industry professionals believe that tracers can affect the pores of water-injected formations, and even plug the pores, and this risk can be avoided by using a degradable radioisotope tracer in a water-injected environment. The prior patent contains the technologies of density adjustment, isotope loading, surface modification and the like, is perfected in the aspect of solid-state radioactive isotope tracer, is effective from the aspect of popularization and application, but pays little attention to the degradability of the radioactive isotope tracer, and a few logging units have generated the demands for the degradable radioactive isotope tracer.
Disclosure of Invention
(one) technical problem to be solved by the invention
Aiming at the technical problems that the existing radioisotope tracer is not strong in degradability, the tracer can influence the pore of a water injection layer rock stratum and even can block the pore, the invention provides the degradable radioisotope tracer and the preparation method thereof, the prepared degradable radioisotope tracer can be degraded in 1-24 months under natural conditions, is not easy to naturally migrate into the environment, is easy to protect in the production process, is not easy to desorb in the tracer, has mild preparation conditions and low equipment manufacturing difficulty, can distinguish tracers with different densities and purposes by utilizing colors, and the like, and the density of the prepared degradable radioisotope tracer can be adjusted in a larger range to meet the requirements of different logging conditions.
(II) the technical proposal adopted by the invention for solving the technical problems
A method for preparing a degradable radioisotope tracer, the method comprising at least the steps of:
SS1, soaking a certain amount of fine granular porous zeolite and hollow glass beads in a silane coupling agent solution for a certain time to fully infiltrate the silane coupling agent on the surface of the porous zeolite and in capillary holes, fully adhering the silane coupling agent on the surface of the hollow glass beads, and then taking out the fully infiltrated porous zeolite and hollow glass beads for drying treatment for later use;
SS2, adding a certain amount of fine granular degradable materials and pigments into the porous zeolite and hollow glass microspheres which are subjected to the drying treatment in the step SS1, putting into rolling equipment with a heating function, uniformly spraying isotope solution on the surface of the materials while stirring and heating in a rolling way, controlling the spraying speed to prevent the occurrence of hydrops phenomenon, and completely drying the mixed materials after the spraying is finished, wherein the color of the pigment is set according to the density of a target finished product;
SS3, uniformly mixing the dry mixed material prepared in the step SS2 with a certain amount of adhesive to prepare a viscous mixed material;
SS4, placing the viscous mixed material prepared in the step SS3 into an extruder for extrusion treatment to prepare a fine strip mixed material with the cross section diameter of 0.1-5 mm;
SS5, rapidly transferring the fine strip-shaped mixed material prepared in the step SS4 into a rounding machine for rounding treatment to prepare a granular mixed material with the size range of the target particle size;
SS6. Putting the granular mixed material prepared in the step SS5 into a rolling device with a heating function, uniformly spraying dilute acid on the surface of the material while rolling and stirring and heating, uniformly spraying surfactant solution on the surface of the material after the dilute acid on the surface of the material is completely dried, uniformly spraying antistatic agent solution on the surface of the material after the surfactant solution on the surface of the material is completely dried until the antistatic agent solution on the surface of the material is completely dried, so that a surfactant layer and an antistatic agent layer are sequentially formed on the surface of the granular mixed material from inside to outside, wherein the particle size of the prepared granular mixed material subjected to surface treatment is 50-5000 microns, and the density is 0.2-1.5g/ml;
SS7 sieving the granular mixture subjected to surface treatment prepared in the step SS6 to obtain a finished product of the degradable radioisotope tracer.
Preferably, in step SS1, the porous zeolite and the hollow glass beads are immersed in the silane coupling agent solution for 3 hours or more.
Preferably, in the steps SS1 and SS2, the fineness of the fine granular degradable material, porous zeolite, hollow glass beads and pigment is 80-1000 meshes, and the mass ratio is 10-85:5-80:5-80:0.05-10.
Preferably, in step SS2, the degradable material is starch, polylactic acid, poly 3-hydroxyalkanoate, polycaprolactone, polybutylene succinate, cellulose, chitosan, or a mixture thereof.
Preferably, in step SS2, the pigment is an inorganic pigment or an organic pigment.
Preferably, in step SS3, the binder is a starch gelatinised aqueous solution, a dextrin aqueous solution, a modified starch aqueous solution, a modified cellulose aqueous solution, a poly (ethyl lactate) acetate solution, a polycaprolactone tetrahydrofuran solution, a chitosan acetate solution, or a chloroform solution of poly (butylene succinate), the mass concentration of the binder is 3-10%, and the addition amount is 15-40%.
It is another object of the present invention to provide a degradable radioisotope tracer prepared by the above method of the present invention.
The degradable radioactive isotope tracer prepared by the method is used for injection profile logging by an isotope tracing method, as the degradable materials such as starch and the like are added during the preparation of the granular radioactive isotope tracer, the granular radioactive isotope tracer can be continuously disintegrated along with the degradation of the degradable materials, and under different logging conditions, the isotope tracer has different disintegration rates, and based on the principle, the degradable radioactive isotope tracer prepared by the method can be degraded in 1-24 months under natural conditions, and the degraded tracer can not influence the pores of a rock layer of a water injection layer, and can not cause the technical problem of blocking the pores. In addition, when the granular radioactive isotope tracer is prepared, except for degradable materials such as starch, the components of the porous zeolite loaded with isotopes, the tiny particle carriers such as hollow glass beads and the like are similar to those of rock, and the granular radioactive isotope tracer can be gradually eroded under water flow flushing, so that the degradable radioactive isotope tracer prepared by the method can not cause pollution problems while meeting the requirement of injection profile logging by an isotope tracing method, and has small influence on stratum.
(III) the technical effect achieved by the invention
Compared with the prior art, the degradable radioisotope tracer and the preparation method thereof have the following remarkable technical advantages:
(1) The density of the degradable radioactive isotope tracer prepared by the invention can be adjusted within a larger range of 0.2-1.5g/ml, thereby meeting the requirements of different logging conditions;
(2) The degradable radioisotope tracer prepared by the invention can be degraded in 1-24 months under natural conditions, and has little influence on the injected stratum;
(3) The isotope utilization rate in the preparation process is high and can reach more than 80 percent;
(4) In the preparation method, isotopes exist in an ionic form in the preparation process, are not easy to naturally migrate into the environment, have small influence on the environment, and are easy to protect in the production process;
(5) The prepared degradable radioactive isotope tracer is difficult to desorb in the tracer;
(6) The preparation conditions are mild, and the equipment manufacturing difficulty is low and easy to realize;
(7) The invention can distinguish the tracers with different densities and purposes by utilizing the colors, is clear at a glance, is convenient for production and packaging, and is convenient for users to use.
Detailed Description
For a better understanding of the present invention, its contents are further illustrated below in conjunction with examples so that the advantages and features of the present invention can be more readily understood by those skilled in the art. It should be noted that the following description is only a preferred embodiment of the present invention, but the present invention is not limited to the following embodiment. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield still a further embodiment. It is therefore intended that the present invention include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Examples
The invention provides a preparation method of a degradable radioactive isotope tracer, which aims to solve the technical problems that the existing radioactive isotope tracer is not strong in degradability, the tracer can influence the pore of a water injection layer rock stratum and even can block the pore, and as a preferred embodiment, the preparation method mainly comprises the following steps:
firstly, 0.3Kg of zeolite powder with the granularity of 500 meshes and 0.6Kg of hollow glass beads with the granularity of 500 meshes are taken and soaked in a silane coupling agent solution for at least 3 hours, so that the surface of porous zeolite and capillary holes are fully soaked in the silane coupling agent, the surface of the hollow glass beads is fully adhered with the silane coupling agent, and then the fully soaked porous zeolite and hollow glass beads are taken out for drying treatment for standby.
Secondly, the treated zeolite powder and hollow glass beads are put into a device capable of heating an inclined roller, in the process, 0.01Kg of DPP (dipeptidyl peptidase) scarlet pigment with the granularity of 600 meshes and fine granular degradable materials are added into the zeolite powder and hollow glass, the roller is rolled, meanwhile, radioisotope solution is sprayed on the surface of the material, the spraying speed is controlled, no effusion is caused, the spraying is uniform, the mixed material is completely dried after the spraying is finished, and the degradable materials are starch, polylactic acid, poly-3-hydroxyalkanoate, polycaprolactone, polybutylene succinate, cellulose and chitosan or the mixture thereof. The mass ratio of the degradable material, the porous zeolite, the hollow glass beads and the pigment is controlled to be 10-85:5-80:5-80:0.05-10.
And then uniformly mixing the dried mixture with a binder solution to prepare a viscous mixture, wherein the binder solution is 300ml of a chloroform solution of 10% polybutylene succinate.
And putting the viscous mixed material into an extruder for extrusion treatment, and extruding to obtain the fine-strip mixed material with the cross section diameter of 1.2 mm.
Then, the fine strip-shaped mixed material is rapidly put into a rounding machine for rounding treatment, and the granular mixed material with the size range of the target particle size is prepared.
Then transferring the granular mixed material into a device capable of heating an inclined roller, sequentially spraying dilute acid, a surfactant and an antistatic agent on the surface of the material while rolling, taking care of controlling the spraying speed, avoiding liquid accumulation, completely drying the former solution, and then spraying the next solution. The method comprises the following steps: uniformly spraying dilute acid on the surface of a material, uniformly spraying a surfactant solution on the surface of the material after the dilute acid on the surface of the material is completely dried, uniformly spraying an antistatic agent solution on the surface of the material after the surfactant solution on the surface of the material is completely dried until the antistatic agent solution on the surface of the material is completely dried, so that a surfactant layer and an antistatic agent layer are sequentially formed on the surface of the granular mixed material from inside to outside, wherein the particle size of the prepared granular mixed material subjected to surface treatment is 100-5000 microns, and the density is about 1.0g/ml;
and finally, sieving the granular mixed material subjected to surface treatment to obtain a finished product of the degradable radioisotope tracer.
The object of the present invention is fully effectively achieved by the above-described embodiments. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
The present invention is not described in detail in part as being well known to those skilled in the art.
Claims (3)
1. A method for preparing a degradable radioisotope tracer, the method comprising at least the steps of:
SS1, soaking a certain amount of fine granular porous zeolite and hollow glass beads in a silane coupling agent solution for more than 3 hours, fully soaking the silane coupling agent on the surface of the porous zeolite and in capillary holes, fully adhering the silane coupling agent on the surface of the hollow glass beads, and then taking out the fully soaked porous zeolite and hollow glass beads for drying treatment for later use;
SS2, adding a certain amount of fine granular degradable materials and pigments into the porous zeolite and hollow glass beads which are subjected to drying treatment in the step SS1, putting into rolling equipment with a heating function, uniformly spraying isotope solution on the surface of the materials while stirring and heating in a rolling way, controlling the spraying speed to be not in a hydrops phenomenon, and completely drying the mixed materials after the spraying, wherein the color of the selected pigments is set according to the density of a target finished product, wherein the fineness of the fine granular degradable materials, the porous zeolite, the hollow glass beads and the pigments is 80-1000 meshes, and the mass ratio is 10-85:5-80:5-80:0.05-10 percent of degradable material which is starch, polylactic acid, poly-3-hydroxy alkyl acid ester, polycaprolactone, polybutylene succinate, cellulose, chitosan or the mixture thereof, and the pigment which is inorganic pigment or organic pigment;
SS3, uniformly mixing the dry mixed material prepared in the step SS2 with a certain amount of adhesive to prepare a viscous mixed material, wherein the adhesive mass concentration of the adhesive is 3-10%, and the addition amount is 15-40%;
SS4, placing the viscous mixed material prepared in the step SS3 into an extruder for extrusion treatment to prepare a fine strip mixed material with the cross section diameter of 0.1-5 mm;
SS5, rapidly transferring the fine strip-shaped mixed material prepared in the step SS4 into a rounding machine for rounding treatment to prepare a granular mixed material with the size range of the target particle size;
SS6. Putting the granular mixed material prepared in the step SS5 into a rolling device with a heating function, uniformly spraying dilute acid on the surface of the material while rolling and stirring and heating, uniformly spraying surfactant solution on the surface of the material after the dilute acid on the surface of the material is completely dried, uniformly spraying antistatic agent solution on the surface of the material after the surfactant solution on the surface of the material is completely dried until the antistatic agent solution on the surface of the material is completely dried, so that a surfactant layer and an antistatic agent layer are sequentially formed on the surface of the granular mixed material from inside to outside, wherein the particle size of the prepared granular mixed material subjected to surface treatment is 50-5000 microns, and the density is 0.2-1.5g/ml;
SS7 sieving the granular mixture subjected to surface treatment prepared in the step SS6 to obtain a finished product of the degradable radioisotope tracer.
2. The method for preparing a degradable radioisotope tracer as claimed in claim 1, wherein in step SS3, the binder is aqueous starch gelatinisation solution, aqueous dextrin solution, aqueous modified starch solution, aqueous modified cellulose solution, ethyl polylactic acetate solution, polycaprolactone tetrahydrofuran solution, chitosan acetic acid solution, or chloroform solution of polybutylene succinate.
3. A degradable radioisotope tracer prepared by the method of claim 1 or 2.
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| WO2008122596A2 (en) * | 2007-04-05 | 2008-10-16 | Cinvention Ag | Curable therapeutic implant composition |
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