CN113012838A - Radiation-proof composite colloidal particle and preparation method and application thereof - Google Patents
Radiation-proof composite colloidal particle and preparation method and application thereof Download PDFInfo
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/10—Organic substances; Dispersions in organic carriers
- G21F1/103—Dispersions in organic carriers
- G21F1/106—Dispersions in organic carriers metallic dispersions
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
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Abstract
The invention belongs to the technical field of composite materials, and particularly relates to a radiation-proof composite colloidal particle and a preparation method and application thereof. The radiation-resistant composite colloidal particle comprises the following components in parts by weight: 10-30 parts of BECQ powder, 70-90 parts of polymer, 0.5-0.9 part of antioxidant, 0.3-0.8 part of ultraviolet absorbent and 0.3-0.5 part of antibacterial agent. According to the invention, the BECQ powder is a multi-element micron particle and has a core-shell structure, so that high-energy radiation rays can be effectively shielded, on one hand, the BECQ powder can enable incident energy to generate eddy current loss, and meanwhile, a nickel source ion precursor on the surface of the BECQ powder can have a certain shielding effect on the rays; in addition, the anti-radiation composite colloidal particles also contain an antioxidant, an ultraviolet absorbent and an antibacterial agent, so that the anti-radiation composite colloidal particles have radiation resistance, certain ultraviolet resistance, oxidation resistance, antibacterial capacity and the like, and have a certain application prospect in the field of materials.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a radiation-proof composite colloidal particle and a preparation method and application thereof.
Background
With the rapid development of modern science and technology, various high-energy rays (X rays and gamma rays) are more and more widely applied in the fields of military affairs, communication, medicine, industry and agriculture and the like and daily life. But brings convenience and enjoyment to people, and simultaneously various high-energy rays bring certain harm to people. The present study shows that the influence of radiation on the human body mainly has the following aspects: electromagnetic radiation is a major cause of cardiovascular disease, diabetes, cancer mutations; direct injury to the human reproductive system, nervous system and immune system; electromagnetic radiation is the inducing factor for abortion, infertility and teratogenesis of pregnant women; excessive electromagnetic radiation directly affects the tissue development, skeleton development, visual deterioration, liver hematopoietic function reduction of children, and severe patients can cause retinal detachment; electromagnetic radiation can cause endocrine disorders. Therefore, how to reduce various radiation intensities, prevent radiation pollution, effectively protect the environment and protect human health becomes a research hotspot of numerous scholars.
Radiation protection materials are materials which can absorb or dissipate radiation energy and protect human bodies or instruments, radiation sources causing human body injury are various (including ionizing radiation and non-ionizing radiation), energy levels of generated rays are different, materials resisting the radiation are different, and therefore various radiation protection products are made with various characteristics.
X-rays, which are photon radiation, essentially electromagnetic waves, have a strong penetration, and are commonly used in medical instruments for examining certain diseases of the internal organs of the human body or for quality inspection of industrial products. The related workers can be injured by long-term exposure to rays on the gonads, the mammary glands, the red bone marrow and the like of the human bodies, and if the dosage exceeds a certain dosage, diseases such as leukemia, bone tumor and the like can be caused, thereby bringing serious threat to life. The traditional medical shielding material is lead, the atomic number of the lead is 82, the lead has good energy absorption characteristics, and the lead is an ideal material for shielding high-energy ionizing radiation. However, there is a weak area of particle absorption (i.e., the "weak absorption region" for lead) for ionizing radiation having energies between 40keV and 88.0keV, and thus the drawbacks of radiation protective materials made with lead as the only absorbing substance are apparent. In addition, the heavy protection products of glass, organic glass, rubber and other products containing lead cause the back and waist muscles of medical and radiological workers to be tired and even damaged, and lead oxide in the products has certain toxicity and can pollute the environment to a certain extent, so the development of lead-free or lead-less radiation protection materials is very important.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a radiation-proof composite colloidal particle and a preparation method and application thereof. Solves the problems that lead oxide in the traditional lead-containing radiation-proof material has certain toxicity and can cause pollution to the environment to a certain degree, and the like.
An object of the present invention is to provide a radiation-proof composite colloidal particle.
The radiation-proof composite colloidal particle comprises the following components in parts by weight: 10-30 parts of BECQ powder, 70-90 parts of polymer, 0.5-0.9 part of antioxidant, 0.3-0.8 part of ultraviolet absorbent and 0.3-0.5 part of antibacterial agent.
Preferably, the polymer is one or more of polypropylene, polyamide and polytetrafluoroethylene.
Preferably, the antioxidant is one or more of IF168, IN3114 and INB 215.
Preferably, the ultraviolet absorber is CHIMASSORB 2020BOX and the antimicrobial agent is IRGAGUARD B1000.
Preferably, the BECQ powder has a core-shell structure in parts by weight, and the BECQ core comprises the following components in parts by weight: the BECQ shell comprises, by weight, 20-35 parts of a titanium source ion precursor, 40-55 parts of a zinc source ion precursor, 20-35 parts of a rare earth cerium source ion precursor and 3-7 parts of a dispersing agent, wherein the BECQ shell comprises, by weight, 30-50 parts of a nickel source ion precursor.
More preferably, the titanium source ion precursor is butyl titanate, the zinc source ion precursor is one of zinc nitrate and zinc acetate, the rare earth cerium source ion precursor is one of cerium sulfate and cerium nitrate, the dispersing agent is polyvinyl alcohol, and the nickel source ion precursor is nickel chloride hexahydrate.
According to the invention, the BECQ powder is a multi-element micron particle, and the inventor finds that a titanium source ion precursor, a zinc source ion precursor, a rare earth cerium source ion precursor and a dispersing agent are weighed according to a certain proportion through a large amount of experimental optimization, mixed and subjected to high-temperature sintering, airflow crushing and screening to obtain hollow spherical powder, the hollow spherical powder has a hollow structure and can effectively shield high-energy radiation rays, further, a nickel source ion precursor is added according to a certain proportion, the hollow spherical powder is coated by using a chemical vapor deposition method to prepare the BECQ powder with a core-shell structure, on one hand, the BECQ powder can enable incident energy to generate eddy current loss, and meanwhile, a nickel source ion precursor shell on the surface of the BECQ powder can have a certain shielding effect on the incident rays; on the basis of the BECQ powder, the composite colloidal particles are added with an ultraviolet absorbent to further enhance the ultraviolet absorption capacity, and added with an antioxidant and an antibacterial agent to further improve the performances of the composite colloidal particles in the aspects of oxidation resistance, bacteria resistance and the like. Therefore, the composite colloidal particles have radiation resistance, certain ultraviolet resistance, oxidation resistance, antibacterial capacity and the like, and have a certain application prospect in the field of materials.
The invention also aims to provide a preparation method of the radiation-proof composite colloidal particles.
The preparation method comprises the following steps:
s1, BECQ powder preparation: weighing a titanium source ion precursor, a zinc source ion precursor, a rare earth cerium source ion precursor and a dispersing agent according to a ratio, mixing, performing high-temperature sintering, airflow crushing and screening to obtain hollow spherical powder, adding a nickel source ion precursor according to a ratio, and coating the hollow spherical powder by using a chemical vapor deposition method to prepare the BECQ powder with a core-shell structure;
s2: uniformly mixing 10-30 parts by weight of BECQ powder prepared in the step S1, 70-90 parts by weight of polymer, 0.5-0.9 part by weight of antioxidant, 0.3-0.8 part by weight of ultraviolet absorbent and 0.3-0.5 part by weight of antibacterial agent to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is one or more of polypropylene, polyamide and polytetrafluoroethylene.
Preferably, in the step S1, a specific method for coating the hollow sphere-shaped powder by using a chemical vapor deposition method is as follows: firstly, dehydrating and drying the nickel chloride hexahydrate, adding the dehydrated and dried nickel chloride hexahydrate into a hollow spherical powder reaction container, then introducing a certain amount of hydrogen into the reaction container, carrying out a reduction reaction at a certain temperature, simultaneously introducing a certain amount of argon as a protective gas, and finally obtaining a metal nickel coating shell on the surface of the hollow spherical powder after a period of heat preservation reaction.
More preferably, the flow rate of introducing hydrogen into the reaction container is 120ml/min, the flow rate of introducing argon is 180ml/min, the temperature of the reduction reaction is 900-1000 ℃, and after the heat preservation reaction for 70min, the metal nickel coating is finally obtained on the surface of the hollow spherical powder.
The invention finally aims to provide application of the radiation-proof composite colloidal particles in preparation of melt-blown non-woven fabrics.
Compared with the prior art, the invention has the following advantages:
1) according to the invention, the BECQ powder is a multi-element micron particle and has a core-shell structure, so that high-energy radiation rays can be effectively shielded, on one hand, the BECQ powder can enable incident energy to generate eddy current loss, and meanwhile, a nickel source ion precursor on the surface of the BECQ powder can have a certain shielding effect on the rays;
2) the composite colloidal particles are prepared by adding an ultraviolet absorbent on the basis of the BECQ powder to further enhance the ultraviolet absorption capacity, and adding an antioxidant and an antibacterial agent to further improve the performances of the composite colloidal particles in the aspects of oxidation resistance, bacteria resistance and the like. Therefore, the composite colloidal particles have radiation resistance, certain ultraviolet resistance, oxidation resistance, antibacterial capacity and the like, and have certain application scenes in the field of materials.
Drawings
FIG. 1 is a flow chart of a process for preparing composite colloidal particles according to the present invention;
FIG. 2 is a test chart of the ionization shielding performance of X-ray at 50 kV;
FIG. 3 is a graph showing the ionization shielding performance test at 60kV X-ray energy.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention is clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Conventional chemical reagents and equipment used in the present invention are commercially available unless otherwise specified.
Example 1
The preparation method of the composite colloidal particle comprises the following steps:
s1: weighing 20 parts by weight of butyl titanate, 40 parts by weight of zinc nitrate, 35 parts by weight of cerium sulfate and 3 parts by weight of polyvinyl alcohol according to a proportion, mixing, sintering at a high temperature, carrying out jet milling, and screening to obtain hollow spherical powder, then adding 30 parts by weight of nickel chloride hexahydrate according to a proportion, and coating the hollow spherical powder by using a chemical vapor deposition method to prepare BECQ powder with a core-shell structure; the chemical vapor deposition method comprises the following specific processes: and introducing hydrogen into the reaction container at a flow rate of 120ml/min and introducing argon at a flow rate of 180ml/min, performing reduction reaction at a temperature of 900 ℃, and performing heat preservation reaction for 70min to obtain a metallic nickel coating on the surface of the hollow spherical powder.
S2: uniformly mixing 10 parts by weight of BECQ powder prepared in the step S1, 90 parts by weight of polypropylene, 1680.5 parts by weight of IF, 0.8 parts by weight of CHIMASSORB 2020BOX and 10000.3 parts by weight of IRGAGUARD B to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is a mixture of polypropylene and polyamide.
Example 2
The preparation method of the composite colloidal particle comprises the following steps:
s1: weighing 28 parts of butyl titanate, 50 parts of zinc acetate, 28 parts of cerium nitrate and 5 parts of polyvinyl alcohol according to a proportion, mixing, sintering at a high temperature, carrying out air flow crushing, and screening to obtain hollow spherical powder, adding 40 parts of nickel chloride hexahydrate according to a proportion, and coating the hollow spherical powder by using a chemical vapor deposition method to prepare BECQ powder with a core-shell structure; the chemical vapor deposition method comprises the following specific processes: and introducing hydrogen into the reaction container at a flow rate of 120ml/min and introducing argon at a flow rate of 180ml/min, performing reduction reaction at a temperature of 950 ℃, and performing heat preservation reaction for 70min to obtain a metallic nickel coating on the surface of the hollow spherical powder.
S2: uniformly mixing 20 parts by weight of BECQ powder prepared IN the step S1, 80 parts by weight of polypropylene, polyamide, polytetrafluoroethylene, IF168, IN3114, INB 2150.7 parts by weight, CHIMASSORB 2020BOX 0.6 parts by weight and IRGAGUARD B10000.4 parts by weight to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is a mixture of polypropylene, polyamide and polytetrafluoroethylene.
Example 3
The preparation method of the composite colloidal particle comprises the following steps:
s1: weighing 35 parts of butyl titanate, 55 parts of zinc acetate, 20 parts of cerium nitrate and 7 parts of polyvinyl alcohol according to a proportion, mixing, sintering at a high temperature, carrying out air flow crushing, and screening to obtain hollow spherical powder, adding 50 parts of nickel chloride hexahydrate according to a proportion, and coating the hollow spherical powder by using a chemical vapor deposition method to prepare BECQ powder with a core-shell structure; the chemical vapor deposition method comprises the following specific processes: and introducing hydrogen into the reaction container at a flow rate of 120ml/min and introducing argon at a flow rate of 180ml/min, performing reduction reaction at a temperature of 1000 ℃, and performing heat preservation reaction for 70min to obtain a metallic nickel coating on the surface of the hollow spherical powder.
S2: uniformly mixing 30 parts by weight of BECQ powder prepared in the step S1, 70 parts by weight of polytetrafluoroethylene, 2150.9 parts by weight of INB, 0.3 part by weight of CHIMASSORB 2020BOX and 10000.5 parts by weight of IRGAGUARD B to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is a mixture of polypropylene and polytetrafluoroethylene.
Comparative example 1
The whole preparation method was the same as example 2 except that no BECQ powder was added during the preparation of the composite colloidal particles.
The preparation method of the composite colloidal particle comprises the following steps:
s2: uniformly mixing 100 parts by weight of polymer, 0.7 part by weight of antioxidant, 0.6 part by weight of ultraviolet absorbent and 0.4 part by weight of antibacterial agent to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is a mixture of polypropylene, polyamide and polytetrafluoroethylene.
Comparative example 2
The whole preparation method is the same as that of example 2, except that the step of coating the hollow sphere-shaped powder by using a chemical deposition method is omitted in the preparation of the BECQ powder.
Comparative example 3
A radiation protective material was prepared using the method of example 5 in application publication No. CN 111228142A.
Example 4 ionizing radiation protection efficacy verification
The X-ray shielding property of the radiation-proof composite colloidal particles obtained in example 2 was measured by a high-frequency digital flat panel imaging system Definium 8000 (general electric medical System Co., Ltd.). The measurement conditions were: (1) the shielding performance of the finished powder material was measured in comparison with the 0.35 mm thick lead equivalent (Kelida medical equipment development Co., Ltd., Beijing) of the radiation protective clothing; (2) the exposure time was measured at X-ray energy levels ranging from 40 to 140 kilovolt peak and about 10 mAs.
The specific test results are shown in fig. 2 and fig. 3, the radiographic imaging test shows that the brighter the image is, the stronger the shielding effect is, if the protection effect is not available, no image appears in the image, the lower part in the image is a square lead plate, and the color is closer to the lead plate, which indicates that the radiation protection performance is stronger; when the X-ray intensity is 50kV and 60kV, the composite colloidal particles can be observed to be white bright spots, the color of the composite colloidal particles is similar to that of a reference object of a reference lead plate below, and the image test result shows that: 1) the composite colloidal particles have obvious shielding effect under the strength of 50kV and 60 kV; 2) from the radiographic results, it was shown that the shielding performance of the composite colloidal particles was similar to that of a lead plate having a thickness of 1mm under the strength condition.
Example 5 radiation Performance test
Taking the radiation-proof composite colloidal particles prepared in the embodiments 1-3 and the comparative examples 1-2 to perform radiation performance tests, specifically, the test instrument is a thermoluminescent dosimeter (RGD-3B/S), the measurement range is 0.01 mu Gy-10Gy, the linear deviation is less than 1%, the light source stability is not more than 0.5% (continuous 10h), the maximum heating temperature is 400 ℃, the linear heating rate is 1 ℃/S-40 ℃/S, the specific test standards are that the surface absorption amount is tested according to GBZ128-2002 and GBZ207-2008, meanwhile, lead with the weight corresponding to each radiation protection material is respectively adopted as the test surface absorption amount of a standard sample, and the specific test results are shown in Table 1:
TABLE 1 test results table
As can be seen from the data in table 1, in comparative example 1, since no BECQ powder was added, the radiation-resistant composite colloidal particle prepared had almost no radiation-resistant property, and the surface absorption amount (mGy) thereof was 0.15; in comparative example 2, the step of coating the hollow spherical powder by using a chemical deposition method is omitted, the radiation resistance of the prepared radiation-resistant composite colloidal particles is lower than that of examples 1-3, the surface absorption capacity (mGy) of the particles is 93.03, and the radiation resistance of the radiation-resistant composite colloidal particles reaches 76.54% of the corresponding surface absorption capacity (mGy) of a standard sample (lead), and the result shows that the radiation resistance of the core-shell structured BECQ powder formed after the surface of the hollow spherical powder is coated with nickel by using the chemical deposition method is further enhanced; in the comparative example 3, the radiation protection material is prepared by adopting the method of the example 5 in the application publication No. CN111228142A, the radiation resistance performance of the prepared radiation-resistant composite colloidal particle is lower than that of the examples 1-3, the surface absorption capacity (mGy) is 105, and reaches 78.26% of the corresponding surface absorption capacity (mGy) of a standard sample (lead), because the core components of the radiation-resistant composite colloidal particle prepared in the comparative example 3 are more than that of the invention, polyvinyl alcohol is adopted for coating the shell, the core components are less, and the chemical deposition method is adopted for coating the metal nickel coating for coating the shell, the result shows that the radiation resistance performance of the prepared radiation-resistant composite colloidal particle is obviously improved after the shell coating is carried out by the chemical deposition method; the surface absorption capacity (mGy) of the radiation composite colloidal particle prepared in example 1 was 128.57, which was 88.45% of the corresponding surface absorption capacity (mGy) of the standard sample (lead); the surface absorption capacity (mGy) of the radiation composite colloidal particle prepared in example 2 was 127.53, which reached 89.63% of the corresponding surface absorption capacity (mGy) of the standard sample (lead); the surface absorption capacity (mGy) of the radiation composite colloidal particle prepared in the example 3 is 123.34, and reaches 87.12% of the corresponding surface absorption capacity (mGy) of a standard sample (lead), and the result shows that the composite colloidal particle has better radiation resistance and a certain application prospect in the field of materials.
Example 6 application of radiation-proof composite colloidal particles in preparation of melt-blown nonwoven fabric
Mixing 75 mass percent of the anti-radiation composite colloidal particles prepared in the example 2 with 25 mass percent of polymer, feeding, melting and extruding, forming fibers, cooling the fibers, forming a net, and reinforcing the net into cloth to prepare melt-blown non-woven fabric; and (3) taking the non-radiation-resistant composite colloidal particles as a blank control, and carrying out radiation performance test:
the result shows that the prepared melt-blown non-woven fabric has almost no radiation resistance performance without adding the radiation-resistant composite colloidal particles; the added radiation-proof composite colloidal particles ensure that the surface absorption capacity (mGy) of the prepared melt-blown non-woven fabric is 95.65 and reaches 67.22% of the corresponding surface absorption capacity (mGy) of a standard sample (lead), so the radiation-proof composite colloidal particles have good application prospect in the field of melt-blown non-woven fabric preparation.
The above embodiments are merely for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.
Claims (10)
1. The radiation-proof composite colloidal particle is characterized by comprising the following components in parts by weight: 10-30 parts of BECQ powder, 70-90 parts of polymer, 0.5-0.9 part of antioxidant, 0.3-0.8 part of ultraviolet absorbent and 0.3-0.5 part of antibacterial agent.
2. The radiation-proof composite colloidal particle as defined in claim 1, wherein the polymer is one or more of polypropylene, polyamide and polytetrafluoroethylene.
3. The radiation protection composite colloidal particle as claimed IN claim 1, wherein the antioxidant is one or more of IF168, IN3114 and INB 215.
4. The radiation protective composite colloidal particles of claim 1 wherein the ultraviolet absorber is CHIMASSORB 2020BOX and the antimicrobial agent is IRGAGUARD B1000.
5. The radiation protection composite colloidal particle of claim 1, wherein the BECQ powder has a core-shell structure, and the BECQ core comprises the following components in parts by weight: the BECQ shell comprises, by weight, 20-35 parts of a titanium source ion precursor, 40-55 parts of a zinc source ion precursor, 20-35 parts of a rare earth cerium source ion precursor and 3-7 parts of a dispersing agent, wherein the BECQ shell comprises, by weight, 30-50 parts of a nickel source ion precursor.
6. The radiation-proof composite colloidal particle of claim 5, wherein the titanium source ion precursor is butyl titanate, the zinc source ion precursor is one of zinc nitrate and zinc acetate, the rare earth cerium source ion precursor is one of cerium sulfate and cerium nitrate, the dispersing agent is polyvinyl alcohol, and the nickel source ion precursor is nickel chloride hexahydrate.
7. The preparation method of the radiation-proof composite colloidal particles as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
s1, BECQ powder preparation: weighing a titanium source ion precursor, a zinc source ion precursor, a rare earth cerium source ion precursor and a dispersing agent according to a ratio, mixing, performing high-temperature sintering, airflow crushing and screening to obtain hollow spherical powder, adding a nickel source ion precursor according to a ratio, and coating the hollow spherical powder by using a chemical vapor deposition method to prepare the BECQ powder with a core-shell structure;
s2: uniformly mixing 10-30 parts by weight of BECQ powder prepared in the step S1, 70-90 parts by weight of polymer, 0.5-0.9 part by weight of antioxidant, 0.3-0.8 part by weight of ultraviolet absorbent and 0.3-0.5 part by weight of antibacterial agent to obtain a mixture;
s3: and (3) mixing, extruding, drawing and cutting the mixture with the mass fraction of 60% and the polymer with the mass fraction of 40% which are prepared in the step S2 into composite colloidal particles at 155 ℃, wherein the polymer is one or more of polypropylene, polyamide and polytetrafluoroethylene.
8. The method for preparing radiation protection composite colloidal particles according to claim 7, wherein the step S1 is a specific method for coating the hollow sphere-shaped powder by using a chemical vapor deposition method, and the specific method comprises the following steps: firstly, dehydrating and drying the nickel chloride hexahydrate, adding the dehydrated and dried nickel chloride hexahydrate into a hollow spherical powder reaction container, then introducing a certain amount of hydrogen into the reaction container, carrying out a reduction reaction at a certain temperature, simultaneously introducing a certain amount of argon as a protective gas, and finally obtaining a metal nickel coating shell on the surface of the hollow spherical powder after a period of heat preservation reaction.
9. The radiation-proof composite colloidal particles as claimed in claim 8, wherein the flow rate of hydrogen introduced into the reaction vessel is 120ml/min, the flow rate of argon introduced into the reaction vessel is 180ml/min, the temperature of the reduction reaction is 900-1000 ℃, and after the heat preservation reaction for 70min, a metal nickel coating shell is finally obtained on the surface of the hollow spherical powder.
10. Use of the radiation-proof composite colloidal particles according to claim 1 or the radiation-proof composite colloidal particles prepared by the preparation method of the radiation-proof composite colloidal particles according to claim 7 in preparation of melt-blown non-woven fabrics.
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