A medical polymer nano radiation shielding plate

Abstract

The invention discloses a medical polymer nano radiation shielding plate, which relates to the technical field of radiation shielding and comprises a plurality of shielding layers which are stacked and arranged, wherein the shielding layer comprises a plurality of shielding substrates which are spliced ​​together, and a connecting layer is arranged between the plurality of shielding substrates and on the surface of the shielding layer; the shielding substrate comprises the following components: 100 parts of epoxy resin, 377-427.5 parts of nano samarium oxide, 12.5-63 parts of nano bismuth oxide, and 35-96.5 parts of auxiliary agent A; and the connecting layer comprises the following components: 100 parts of PVC resin, 34.5-66 parts of barium sulfate, and 3.5-22.5 parts of auxiliary agent B. A resin plate containing 65% to 80% nano-samarium oxide and nano-bismuth oxide is used as a shielding substrate, and a resin plate containing 20% ​​to 40% barium sulfate is used as a connecting layer. Multiple shielding substrates are coated with the connecting layer to form a shielding layer. The shielding layer has both extremely high shielding performance and strong mechanical properties. Multiple shielding layers are stacked to prevent radiation from penetrating through the connecting layer between adjacent shielding substrates.

Description

Technical Field

[0001] The invention relates to the technical field of radiation shielding, in particular to a medical polymer nano radiation shielding plate. Background Art

[0002] As the requirements for lightweight and lead-free radiation shielding plates become more stringent, polymer-based shielding materials are becoming more and more valued. The existing mainstream medical radiation shielding plates are made of resin shielding materials mixed with nanofillers such as barium sulfate, samarium oxide or bismuth oxide. Among them, the resin shielding materials mixed with nanofillers such as barium sulfate, samarium oxide or bismuth oxide have higher radiation absorption performance. When the nanofiller content reaches (70±5)%, the radiation absorption performance of the shielding material can reach the highest.

[0003] As for the mechanical properties of the material, when the content of nanofiller is (30±5)%, the mechanical properties of the material are optimal. When the filler is added in excess and the content reaches 40%, a large number of filler agglomerations and voids will form inside the material, which will destroy the resin cross-linking network, and the tensile strength and flexural strength of the composite material will drop sharply.

[0004] Therefore, this type of resin shielding material has the defect of insufficient mechanical properties, which makes it difficult to apply resin shielding materials with a high content of nanofillers to radiation shielding panels with high requirements for mechanical properties. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a medical polymer nano radiation shielding plate, and the specific technical solution is as follows:

[0006] A medical polymer nano radiation shielding plate, comprising a plurality of shielding layers stacked and arranged, wherein the shielding layer is formed by splicing a plurality of shielding substrates, and a connecting layer is provided between the plurality of shielding substrates and on the surface of the shielding layer;

[0007] The shielding substrate is made of the following components: by weight, 100 parts of epoxy resin, 377-427.5 parts of nano samarium oxide, 12.5-63 parts of nano bismuth oxide, and 35-96.5 parts of auxiliary agent A, wherein the auxiliary agent A includes a defoamer, an accelerator, and a curing agent;

[0008] The tie layer comprises the following components: by weight, 100 parts of PVC resin, 34.5-66 parts of barium sulfate, and 3.5-22.5 parts of auxiliary agent B, wherein the auxiliary agent B comprises a dispersant, a heat stabilizer, a lubricant, a toughening agent, and a coupling agent.

[0009] Preferably, by weight: the auxiliary agent A contains 0.5-6.5 parts of defoamer, 1.5-5 parts of accelerator, and 33-85 parts of curing agent; the auxiliary agent B contains 0.5-2 parts of dispersant, 0.5-2.5 parts of heat stabilizer, 0.5-5 parts of lubricant, 1-10 parts of toughening agent, and 1-3 parts of coupling agent.

[0010] Preferably, the preparation of the shielding substrate comprises the following steps:

[0011] Step 1: Mix epoxy resin, nano samarium oxide and nano bismuth oxide according to the weight ratio and stir to evenly disperse them;

[0012] Step 2: Add additive A, stir and disperse evenly, and then vacuum degas;

[0013] Step 3: Pour into a mold, and after curing, the shielding substrate is formed.

[0014] Preferably, the preparation of the shielding layer comprises the following steps:

[0015] Step 11: placing a plurality of the shielding substrates in parallel in a mold;

[0016] Step 12: pouring the barium sulfate-PVC resin mixture into the mold of step 11 and covering a plurality of the shielding substrates to obtain an intermediate product;

[0017] Step 13: After the barium sulfate-PVC resin mixture in step 12 is cooled and solidified, the intermediate product is turned over, and the barium sulfate-PVC resin mixture is continued to be poured, and the plurality of shielding substrates are covered;

[0018] Step 14: After cooling and solidification, the shielding layer is obtained.

[0019] Preferably, the preparation of the barium sulfate-PVC resin mixed solution comprises the following steps:

[0020] Step 21: Stir the PVC resin at high speed, and add the additive B when the temperature rises to 50-70° C.;

[0021] Step 22: Continue stirring the material obtained in step 21 at high speed, and add barium sulfate when the temperature rises to 70-90°C;

[0022] Step 23: Continue to stir the material obtained in step 22 at a high speed, and when the temperature rises to 120-130° C., evacuate for 2-5 minutes to obtain the barium sulfate-PVC resin mixed solution.

[0023] Preferably, the shielding substrates of two adjacent shielding layers are arranged in a staggered manner.

[0024] Preferably, two sides of the shielding substrate are cut inwardly to form chamfered surfaces, and the two chamfered surfaces are parallel.

[0025] Preferably, the thickness of the bonding layer is between one fifth and one third of the thickness of the shielding substrate.

[0026] Preferably, the nano-samarium oxide and nano-bismuth oxide are nanoparticles modified by a silane coupling agent.

[0027] Preferably, the stirring temperature in step 1 and the curing temperature in step 3 are room temperature.

[0028] The medical polymer nano radiation shielding plate provided by the present invention uses a resin plate containing 65% to 80% of nano samarium oxide and nano bismuth oxide as a shielding substrate, and a resin plate containing 20% ​​to 40% of barium sulfate as a connecting layer, and multiple shielding substrates are coated with the connecting layer to form a shielding layer, so that the shielding layer has both extremely high shielding performance and strong mechanical properties. In addition, by stacking multiple shielding layers, radiation is prevented from penetrating through the connecting layer in adjacent shielding substrates, thereby solving the technical problems in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A side view of a medical polymer nano radiation shielding plate provided in an embodiment of the present invention.

[0031] Figure 2 A side view of a medical polymer nano radiation shielding plate provided in accordance with another embodiment of the present invention.

[0032] The reference numerals are: 10 - shielding layer; 1 - shielding substrate; 11 - beveled surface; 2 - connecting layer. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0034] It should be noted that similar reference numerals denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

[0035] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1 and Figure 2 This embodiment provides a medical polymer nano radiation shielding plate, including a plurality of shielding layers 10 stacked in layers, wherein the shielding layer 10 is formed by splicing a plurality of shielding substrates 1, and a connecting layer 2 is provided between the plurality of shielding substrates 1 and on the surface of the shielding layer 10.

[0039] The shielding substrate 1 is made of the following components: by weight, 100 parts of epoxy resin, 377-427.5 parts of nano samarium oxide, 12.5-63 parts of nano bismuth oxide, and 35-96.5 parts of auxiliary agent A, wherein the auxiliary agent A includes a defoamer, an accelerator, and a curing agent.

[0040] The tie layer 2 is made of the following components: by weight, 100 parts of PVC resin, 34.5-66 parts of barium sulfate, and 3.5-22.5 parts of additive B, wherein the additive B includes a dispersant, a heat stabilizer, a lubricant, a toughening agent, and a coupling agent.

[0041] Among them, the resin plate containing 20% ​​to 40% barium sulfate has extremely high mechanical properties, and the resin plate containing 65% to 80% nano samarium oxide and nano bismuth oxide has higher radiation shielding performance than the barium sulfate plate. Therefore, the resin plate containing 65% to 80% nano samarium oxide and nano bismuth oxide is used as the shielding substrate 1, and the resin plate containing 20% ​​to 40% barium sulfate is used as the connecting layer 2. The shielding layer 10 is formed by coating multiple shielding substrates 1 with the connecting layer 2, so that the shielding layer 10 has both extremely high shielding performance and strong mechanical properties. The multiple shielding layers 10 are stacked and arranged to prevent radiation from penetrating from the connecting layer 2 in the adjacent shielding substrates 1. The coupling agent in the auxiliary agent B can be combined with the resin in the shielding substrate 1 to enhance the connection between the materials.

[0042] The medical polymer nano radiation shielding plate provided in this embodiment uses a resin plate containing 65% to 80% nano samarium oxide and nano bismuth oxide as the shielding substrate 1, and a resin plate containing 20% ​​to 40% barium sulfate as the connecting layer 2, and multiple shielding substrates 1 are coated with the connecting layer 2 to form a shielding layer 10, so that the shielding layer 10 has both extremely high shielding performance and strong mechanical properties. In addition, by stacking the multiple shielding layers 10, radiation is prevented from penetrating from the connecting layer 2 in the adjacent shielding substrates 1, thereby solving the technical problems in the background technology.

[0043] Furthermore, by weight: the defoamer in the auxiliary agent A is 0.5-6.5 parts, the accelerator is 1.5-5 parts, and the curing agent is 33-85 parts. The auxiliary agent B is 0.5-2 parts of the dispersant, 0.5-2.5 parts of the heat stabilizer, 0.5-5 parts of the lubricant, 1-10 parts of the toughening agent, and 1-3 parts of the coupling agent.

[0044] Furthermore, the preparation of the shielding substrate 1 includes the following steps:

[0045] Step 1: Mix epoxy resin, nano samarium oxide and nano bismuth oxide according to the weight ratio and stir to disperse them evenly.

[0046] Step 2: Add additive A, stir and disperse evenly, and then degas in vacuum.

[0047] Step 3: Pour into a mold and form a shielding substrate 1 after solidification.

[0048] Furthermore, the preparation of the shielding layer 10 includes the following steps:

[0049] Step 11: Place multiple shielding substrates 1 in parallel in a mold.

[0050] Step 12: Pour the barium sulfate-PVC resin mixture into the mold of step 11 and cover a plurality of shielding substrates 1 to obtain an intermediate product.

[0051] Step 13: After the barium sulfate-PVC resin mixture in step 12 is cooled and solidified, the intermediate product is turned over, and the barium sulfate-PVC resin mixture is continued to be poured in to cover multiple shielding substrates 1.

[0052] Step 14: After cooling and solidification, the shielding layer 10 is obtained.

[0053] Furthermore, the preparation of the barium sulfate-PVC resin mixed solution includes the following steps:

[0054] Step 21: Stir the PVC resin at high speed and add additive B when the temperature rises to 50~70℃.

[0055] Step 22: Continue to stir the material obtained in step 21 at high speed, and add barium sulfate when the temperature rises to 70-90°C.

[0056] Step 23: Continue to stir the material obtained in step 22 at high speed, and when the temperature rises to 120-130° C., evacuate for 2-5 minutes to obtain a barium sulfate-PVC resin mixed solution.

[0057] Five specific embodiments and seven comparative examples are provided below. The provided embodiments and comparative examples may enable those skilled in the art to more fully understand the present invention, but do not limit the present invention in any way.

[0058] Example 1: A medical polymer nano radiation shielding plate with a thickness of 12 mm, wherein the content of nano bismuth oxide is 2%.

[0059] Preparation of shielding substrate 1: Add 427.5 parts of nano-samarium oxide and 12.5 parts of nano-bismuth oxide to 100 parts of epoxy resin, wherein the particle size of nano-samarium oxide and nano-bismuth oxide is 100-200 nm, stir and disperse at room temperature for 30 minutes, add 2 parts of dimethyl silicone oil defoamer and 1.5 parts of cobalt isooctanoate accelerator in turn, stir for 2 minutes, then add 85 parts of methyl ethyl ketone peroxide curing agent, stir for 2 minutes, and vacuum degas. Finally, pour the material into a mold sprayed with a release agent, and cure at room temperature for 12 hours to obtain shielding substrate 1.

[0060] Preparation of barium sulfate-PVC resin mixed liquid: 100 parts of PVC resin powder are put into a high-speed mixer and run at a low speed. When the temperature reaches 60°C, 0.5 parts of zinc stearate, 2 parts of calcium stearate, 8 parts of CPE and 1 part of ACR are added. After 1.5 minutes, the speed is increased to a high speed. When the friction heat reaches 80°C, 45 parts of barium sulfate powder, 2.5 parts of KH560 silane coupling agent and 2 parts of SP-1800 dispersant are added. When the temperature rises to 100°C, 0.5 parts of PE wax are added. When the temperature reaches 120°C, the mixing is switched from high speed to low speed, and the barium sulfate-PVC resin mixed liquid is obtained after vacuuming for 3 minutes.

[0061] Preparation of shielding layer 10: Pour a layer of barium sulfate-PVC resin mixture into the mold, lay 50 shielding substrates 1 in the mold after solidification, continue to pour the barium sulfate-PVC resin mixture to cover the shielding substrate 1, continue to pour the barium sulfate-PVC resin mixture after solidification, let it stand and solidify, lay the shielding substrate 1 on the surface of the solidified material, and stagger it with the bottom layer of shielding substrate 1, continue to pour the barium sulfate-PVC resin mixture after laying, let it stand and solidify to obtain a shielding board with a double shielding layer 10 bonded.

[0062] Example 2: A medical polymer nano radiation shielding plate with a thickness of 12 mm, wherein the content of nano bismuth oxide is 4%.

[0063] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 415 parts of nano samarium oxide, 25 parts of nano bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoamer, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0064] Example 3: A medical polymer nano radiation shielding plate with a thickness of 12 mm, wherein the content of nano bismuth oxide is 6%.

[0065] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 402 parts of nano samarium oxide, 37.5 parts of nano bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoamer, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0066] Example 4: A medical polymer nano radiation shielding plate with a thickness of 12 mm, wherein the content of nano bismuth oxide is 8%.

[0067] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 390 parts of nano samarium oxide, 50 parts of nano bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoamer, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0068] Example 5: A medical polymer nano radiation shielding plate with a thickness of 12 mm, wherein the content of nano bismuth oxide is 10%.

[0069] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 377 parts of nano samarium oxide, 63 parts of nano bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoamer, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0070] Comparative Example 1: A standard medical radiation shielding plate with a thickness of 12 mm, wherein the bismuth oxide content is 2%.

[0071] The only difference between this comparative example and Example 1 is that the composition and weight of the shielding substrate 1 are: 427.5 parts of ordinary samarium oxide, 12.5 parts of ordinary bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoamer, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0072] Comparative Example 2: A standard medical radiation shielding plate with a thickness of 12 mm, wherein the bismuth oxide content is 4%.

[0073] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 415 parts of ordinary samarium oxide, 25 parts of ordinary bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoaming agent, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0074] Comparative Example 3: A standard medical radiation shielding plate with a thickness of 12 mm, wherein the bismuth oxide content is 6%.

[0075] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 402 parts of ordinary samarium oxide, 37.5 parts of ordinary bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoaming agent, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0076] Comparative Example 4: A standard medical radiation shielding plate with a thickness of 12 mm, wherein the bismuth oxide content is 8%.

[0077] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 390 parts of ordinary samarium oxide, 50 parts of ordinary bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoaming agent, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0078] Comparative Example 5: A standard medical radiation shielding plate with a thickness of 12 mm, wherein the bismuth oxide content is 10%.

[0079] The only difference between this embodiment and embodiment 1 is that the composition and weight of the shielding substrate 1 are: 377 parts of ordinary samarium oxide, 63 parts of ordinary bismuth oxide, 100 parts of epoxy resin, 2 parts of dimethyl silicone oil defoaming agent, 1.5 parts of cobalt isooctanoate accelerator, and 85 parts of methyl ethyl ketone peroxide curing agent.

[0080] Comparative Example 6: A conventional resin shielding plate with a thickness of 12 mm and a barium sulfate content of 60%.

[0081] Preparation method: put 100 parts of PVC resin powder into a high-speed mixer and run it at a low speed. When the temperature reaches 60°C, add 0.5 parts of zinc stearate, 2 parts of calcium stearate, 8 parts of CPE and 1 part of ACR. After 1.5 minutes, the speed is increased to a high speed. When the friction heat reaches 80°C, add 175 parts of barium sulfate powder, 2.5 parts of KH560 silane coupling agent and 2 parts of SP-1800 dispersant. When the temperature rises to 100°C, add 0.5 parts of PE wax. When the temperature reaches 120°C, switch from high-speed mixing to low-speed mixing, and obtain after vacuuming for 3 minutes.

[0082] Comparative Example 7: A conventional resin shielding plate with a thickness of 12 mm, wherein the content of nano samarium oxide is 60%.

[0083] The only difference between this comparative example and comparative example 6 is that the composition and weight parts of the traditional resin shielding plate are: 100 parts of PVC resin powder, 0.5 parts of zinc stearate, 2 parts of calcium stearate, 8 parts of CPE, 1 part of ACR, 175 parts of nano samarium oxide, 2.5 parts of KH560 silane coupling agent, 2 parts of SP-1800 dispersant, and 0.5 parts of PE wax.

[0084] The protection data of the medical polymer nano radiation shielding plate prepared in the above embodiment measured under a tube voltage of 120KV are shown in Table 1:

[0085]

[0086] The flexural strength data of the medical polymer nano radiation shielding plate prepared in the above embodiment are shown in Table 2:

[0087]

[0088] The above data show that:

[0089] 1. After adding nano samarium oxide and nano bismuth oxide, the protection performance is increased by 11.05%~14.5% compared with the standard medical radiation shielding plate.

[0090] 2. The medical radiation shielding board with added nano bismuth oxide has a protective performance increased by 10.4%-11.9% compared with the radiation shielding board with added ordinary bismuth oxide.

[0091] 3. The medical radiation shielding plate with added nano samarium oxide and nano bismuth oxide has a relatively improved flexural performance compared with the standard medical radiation shielding plate, and has a significantly improved flexural performance compared with the traditional resin shielding plate.

[0092] Furthermore, the shielding substrates 1 of two adjacent shielding layers 10 are arranged in a staggered manner.

[0093] Specifically, the shielding substrates 1 of each shielding layer 10 may cover the gaps of adjacent shielding substrates 1 , thereby preventing radiation from passing through the gaps of the shielding substrates 1 .

[0094] For further information, see Figure 2 The two sides of the shielding substrate 1 are cut inwardly to form a beveled surface 11, and the two beveled surfaces 11 are parallel. When multiple shielding substrates 1 are spliced ​​to form a shielding layer 10, the beveled surfaces 11 of adjacent shielding substrates 1 are parallel to each other, so that the rays can be blocked by the shielding substrate 1 no matter where the shielding layer 10 is.

[0095] Furthermore, the thickness of the connecting layer 2 is between one fifth and one third of the thickness of the shielding substrate 1, so as to ensure that the shielding layer 10 has strong mechanical properties while also preventing radiation from passing through the gap between the two shielding substrates 1 as much as possible.

[0096] Furthermore, the nano-samarium oxide and the nano-bismuth oxide are nanoparticles modified by a silane coupling agent.

[0097] The preparation steps of silane coupling agent modified nanoparticles are as follows:

[0098] Take 100mL of ethanol aqueous solution (ethanol to ultrapure water volume ratio of 4:1) in a beaker, adjust the pH to 3-4 with 0.1mol / L dilute hydrochloric acid solution, add appropriate amount of KH570 silane coupling agent, stir and hydrolyze at room temperature for 30min, then add the dried nanoparticles, ultrasonically treat in an ice bath for 30min, transfer the above mixture to a round-bottom flask, heat to 80℃ in an oil bath, and stir at constant temperature for 3h. After the reaction is completed, centrifuge to separate the modified nanoparticles, wash them with anhydrous ethanol for 3 times, and finally dry them in an oven at 80℃ to constant weight to obtain modified nano-samarium oxide nanoparticles and modified nano-bismuth oxide nanoparticles, respectively.

[0099] Furthermore, the stirring temperature in step 1 and the curing temperature in step 3 are room temperature.

[0100] Working principle:

[0101] The resin plate containing 20% ​​to 40% barium sulfate has extremely high mechanical properties, and the resin plate containing 65% to 80% nano samarium oxide and nano bismuth oxide has higher radiation shielding performance than the barium sulfate plate. Therefore, the resin plate containing 65% to 80% nano samarium oxide and nano bismuth oxide is used as the shielding substrate 1, and the resin plate containing 20% ​​to 40% barium sulfate is used as the connecting layer 2. The shielding layer 10 is formed by coating multiple shielding substrates 1 with the connecting layer 2, so that the shielding layer 10 has both extremely high shielding performance and strong mechanical properties. The multiple shielding layers 10 are stacked and arranged to prevent radiation from penetrating from the connecting layer 2 in the adjacent shielding substrates 1. The coupling agent in the auxiliary agent B can be combined with the resin in the shielding substrate 1 to enhance the connection between the materials.

[0102] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0103] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A medical polymer nano radiation shielding plate, characterized in that: Comprising a plurality of shielding layers (10) arranged in a stacked manner, the shielding layer (10) comprising a plurality of shielding substrates (1) spliced ​​together, and a connecting layer (2) being provided between the plurality of shielding substrates (1) and on the surface of the shielding layer (10); The shielding substrate (1) comprises the following components: by weight, 100 parts of epoxy resin, 377-427.5 parts of nano samarium oxide, 12.5-63 parts of nano bismuth oxide, and 35-96.5 parts of auxiliary agent A, wherein the auxiliary agent A comprises a defoaming agent, an accelerator, and a curing agent; The tie layer (2) comprises the following components: by weight, 100 parts of PVC resin, 34.5-66 parts of barium sulfate, and 3.5-22.5 parts of additive B, wherein the additive B comprises a dispersant, a heat stabilizer, a lubricant, a toughening agent, and a coupling agent.

2. The medical polymer nano radiation shielding plate according to claim 1, characterized in that: In parts by weight: the auxiliary agent A contains 0.5-6.5 parts of defoamer, 1.5-5 parts of accelerator, and 33-85 parts of curing agent; the auxiliary agent B contains 0.5-2 parts of dispersant, 0.5-2.5 parts of heat stabilizer, 0.5-5 parts of lubricant, 1-10 parts of toughening agent, and 1-3 parts of coupling agent.

3. The medical polymer nano radiation shielding plate according to claim 2, characterized in that: The preparation of the shielding substrate (1) comprises the following steps: S1: mixing epoxy resin, nano samarium oxide and nano bismuth oxide according to the weight ratio and stirring to disperse them evenly; S2: Add additive A, stir and disperse evenly, and then vacuum degas; S3: pouring into a mold, and forming the shielding substrate (1) after solidification.

4. The medical polymer nano radiation shielding plate according to claim 3, characterized in that: The preparation of the shielding layer (10) comprises the following steps: S11: placing a plurality of the shielding substrates (1) in parallel in a mold; S12: pouring the barium sulfate-PVC resin mixture into the mold of step S11 and covering a plurality of the shielding substrates (1) to obtain an intermediate product; S13: after the barium sulfate-PVC resin mixture in step S12 is cooled and solidified, the intermediate product is turned over, and the barium sulfate-PVC resin mixture is continuously poured in, so as to cover the plurality of shielding substrates (1); S14: After cooling and solidification, the shielding layer (10) is obtained.

5. The medical polymer nano radiation shielding plate according to claim 4, characterized in that: The preparation of the barium sulfate-PVC resin mixed solution comprises the following steps: S21: Stir the PVC resin at high speed, and add the additive B when the temperature rises to 50-70°C; S22: Continue to stir the material obtained in step S21 at high speed, and add barium sulfate when the temperature rises to 70-90°C; S23: The material obtained in step S22 is continuously stirred at a high speed, and when the temperature rises to 120-130° C., vacuum is drawn for 2-5 minutes to obtain the barium sulfate-PVC resin mixed solution.

6. The medical polymer nano radiation shielding plate according to any one of claims 1 to 5, characterized in that: The shielding substrates (1) of two adjacent shielding layers (10) are arranged in a staggered manner.

7. The medical polymer nano radiation shielding plate according to claim 6, characterized in that: Both sides of the shielding substrate (1) are cut inwardly to form beveled surfaces (11), and the two beveled surfaces (11) are parallel.

8. The medical polymer nano radiation shielding plate according to claim 6, characterized in that: The thickness of the connecting layer (2) is between one fifth and one third of the thickness of the shielding substrate (1).

9. The medical polymer nano radiation shielding plate according to any one of claims 1 to 5, characterized in that: The nano samarium oxide and nano bismuth oxide are nano particles modified by a silane coupling agent.

10. The medical polymer nano radiation shielding plate according to claim 3, characterized in that: The stirring temperature in step S1 and the curing temperature in step S3 are room temperature.

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