Shielding composite film, preparation method and application thereof, one-dimensional grid and X-ray equipment

Abstract

The invention provides a shielding composite film, a preparation method and application thereof, a one-dimensional grid and X-ray equipment, and relates to the technical field of ray shielding. The shielding composite film comprises a shielding layer and a base body layer, wherein the shielding layer is arranged on the surface of one side of the base body layer; wherein the shielding layer is made of a shielding material composition, and the density of the shielding layer is 3-13g / cm < 3 >; the thickness of the base body layer ranges from 0.05 mm to 10 mm. The thickness of the shielding layer ranges from 0.01 mm to 3 mm. The shielding composite film provided by the invention can realize selective transmission and shielding of X rays or gamma rays, and has a good application prospect. Meanwhile, the preparation method of the shielding composite film is simple to operate and stable in process. In view of the advantages of the shielding composite film, the shielding composite film has a good application prospect in the field of shielding X rays or gamma rays.

Description

[0001] This divisional application is a divisional application based on the Chinese patent application with application number 2021116149336, application date December 23, 2021, and invention name "Shielding material composition, shielding layer, shielding composite film, preparation method and application". Technical Field

[0002] The present invention relates to the field of radiation shielding technology, and in particular to a shielding material composition, a shielding layer, a shielding composite film, and a preparation method and application thereof. Background Art

[0003] The X-rays emitted by the tube of the X-ray device will produce strong scattered rays after passing through the object being measured, thereby affecting the image quality. Therefore, a filter grid is generally used to reduce the impact of scattered rays on the image.

[0004] The grid used in traditional X-ray equipment is mainly composed of a shielding layer and a base layer. Lead foil is often used for the shielding layer, and aluminum foil is often used for the base layer. However, lead foil is harmful to the human body and the environment. Replacing it with other metals requires many steps and is costly to prepare the corresponding metal foil, such as W / WNiFe / Mo foil. At the same time, aluminum foil, which is used as the base layer, has a high density and poor penetration.

[0005] In view of this, the present invention is proposed to solve at least one of the above technical problems. Summary of the invention

[0006] A first object of the present invention is to provide a shielding material composition.

[0007] The second object of the present invention is to provide a shielding layer made of the above-mentioned shielding material composition, which has a good shielding and protection effect for X-rays or gamma rays and has little harm to the human body or the environment.

[0008] The third object of the present invention is to provide a method for preparing the above-mentioned shielding layer.

[0009] The fourth object of the present invention is to provide a shielding composite film made of the above-mentioned shielding material composition.

[0010] The fifth object of the present invention is to provide a method for preparing the above-mentioned shielding composite film.

[0011] The sixth object of the present invention is to provide an application of the above-mentioned shielding layer or shielding composite film.

[0012] In order to achieve the above object, the technical solution of the present invention is as follows:

[0013] The present invention provides a shielding material composition, comprising the following raw materials:

[0014] Shielding agent 30-98%, solvent 1-40%, dispersant 0-5% and binder 1-40%;

[0015] Wherein, the shielding agent includes a first shielding agent and / or a second shielding agent;

[0016] The first shielding agent comprises any one of molybdenum powder, tantalum powder, tin powder or antimony powder, or a combination of at least two thereof;

[0017] The second shielding agent includes any one of molybdenum oxide, tantalum oxide, tin oxide or antimony oxide, or a combination of at least two thereof.

[0018] Furthermore, based on the above technical solution of the present invention, the first shielding agent also includes any one of tungsten powder, bismuth powder or lead powder, or a combination of at least two of them.

[0019] Furthermore, based on the above technical solution of the present invention, the second shielding agent further comprises any one of tungsten oxide, bismuth oxide, lead oxide or barium sulfate, or a combination of at least two thereof.

[0020] Further, based on the above technical solution of the present invention, the shielding agent includes a first shielding agent, the first shielding agent includes tungsten powder and tantalum powder, and the mass ratio of the tungsten powder to the tantalum powder is (0.5-99.5): (0.5-99.5), preferably 99:1;

[0021] Or, the shielding agent includes a first shielding agent, the first shielding agent includes lead powder, tungsten powder, molybdenum powder and tantalum powder, and the mass ratio of the lead powder, tungsten powder, molybdenum powder and tantalum powder is (1-40): (1-80): (1-50): (1-20).

[0022] Further, based on the above technical solution of the present invention, the shielding agent includes a second shielding agent, and the second shielding agent includes tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide, and the mass ratio of tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide is (1-30): (1-30): (1-40): (1-80): (1-20);

[0023] Or, the shielding agent includes a first shielding agent and the second shielding agent, and the shielding agent includes tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide, and the mass ratio of the tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide is (1-30): (1-30): (1-40): (1-80).

[0024] Further, based on the above technical solution of the present invention, the dispersant includes any one of glycerol, stearic acid, oleic acid or zinc stearate, or a combination of at least two of them.

[0025] Further, based on the above technical solution of the present invention, the binder includes any one of polyvinyl butyral, methyl cellulose, polyurethane or polymethyl methacrylate, or a combination of at least two thereof.

[0026] Furthermore, based on the above technical solution of the present invention, the solvent includes any one of water, ethanol or ketone solvents, or a combination of at least two of them.

[0027] The present invention also provides a shielding layer, which is made of the above shielding material composition, and the density of the shielding layer is 3-13g / cm 3 .

[0028] Furthermore, based on the above technical solution of the present invention, the thickness of the shielding layer is 0.01 to 3 mm.

[0029] The present invention also provides a method for preparing the above-mentioned shielding layer, comprising the following steps:

[0030] The slurry formed by mixing the shielding agent, the solvent, the dispersant and the binder is coated into a film to obtain a shielding layer;

[0031] Wherein, the viscosity of the slurry is 8000-120000 mPa·s.

[0032] The present invention also provides a shielding composite film, comprising a shielding layer and a base layer, wherein the shielding layer is arranged on one side surface of the base layer;

[0033] The shielding layer is made of the above-mentioned shielding material composition, and the density of the shielding layer is 3-13 g / cm 3 .

[0034] Furthermore, based on the above technical solution of the present invention, the material of the base layer includes any one of tetrafluoroethylene, polyvinyl chloride, polyvinyl butyral, polyethylene, graphite paper, aluminum foil, paper or carbon fiber.

[0035] Further, based on the above technical solution of the present invention, the thickness of the substrate layer is 0.05-10 mm;

[0036] The thickness of the shielding layer is 0.01-3 mm.

[0037] The present invention also provides a method for preparing the above-mentioned shielding composite film, comprising the following steps:

[0038] The shielding layer formed by the shielding material composition is arranged on one side surface of the base layer to obtain a shielding composite film.

[0039] Furthermore, based on the above technical solution of the present invention, the method for preparing the shielding composite film comprises the following steps:

[0040] After the shielding agent and the solvent are mixed, a dispersant is added for grinding, and then separated to obtain a dispersed material;

[0041] The slurry formed by mixing the dispersed material and the binder is coated on the base layer, and dried to form a shielding layer on one side surface of the base layer to obtain a shielding composite film.

[0042] Furthermore, based on the above technical solution of the present invention, the viscosity of the slurry is 8000-120000 mPa.s.

[0043] Furthermore, based on the above technical solution of the present invention, the coating speed is 0.2-5m / min.

[0044] Furthermore, based on the above technical solution of the present invention, the drying temperature is 20-120°C.

[0045] The present invention also provides application of the shielding layer or shielding composite film in the field of shielding X-rays or gamma-rays.

[0046] The present invention also provides a one-dimensional filter grid, which is made of the above-mentioned shielding layer or the above-mentioned shielding composite film.

[0047] Furthermore, based on the above technical solution of the present invention, the one-dimensional filter grid is used in conjunction with the tube of the X-ray device, including a plurality of shielding composite membranes, wherein the plurality of shielding composite membranes are stacked, and any two adjacent shielding composite membranes are connected by an adhesive layer to form an integrated module.

[0048] Furthermore, based on the above technical solution of the present invention, the thickness of the shielding layer is 20-200 μm, and the thickness of the base layer is 80-1000 μm.

[0049] Furthermore, based on the above technical solution of the present invention, positioning holes are opened or positioning blocks are arranged on both end surfaces of the integrated module along the stacking direction of the shielding layer and the base layer.

[0050] Furthermore, based on the above technical solution of the present invention, a carbon fiber plate is provided on at least one end face of the integrated module perpendicular to the stacking direction of the shielding layer and the base layer.

[0051] Further, based on the above technical solution of the present invention, the focal length of the one-dimensional grid is 0.6-1.8m;

[0052] And / or, the grid ratio of the one-dimensional grid is (5-8):1;

[0053] And / or, the line density of the one-dimensional grid is 40-125 / cm.

[0054] The present invention also provides a two-dimensional filter grid, which is made of the above-mentioned shielding layer and the above-mentioned shielding composite film.

[0055] Further, on the basis of the above technical solution of the present invention, the two-dimensional filter grid includes a shielding composite membrane and a shielding layer, a plurality of the shielding composite membranes are stacked, and any two adjacent shielding composite membranes are connected by an adhesive layer to form a molding module;

[0056] A plurality of the molding modules are arranged along a direction perpendicular to the stacking direction of the shielding composite films, and the positions of the shielding composite films in any two adjacent molding modules correspond to each other;

[0057] The shielding layer is arranged between any two adjacent molding modules, the molding module and the shielding layer are connected by an adhesive layer, the shielding layer is arranged along the stacking direction of the shielding composite film, and the two adjacent shielding layers and the shielding composite film between the two shielding layers enclose a ray channel.

[0058] Furthermore, based on the above technical solution of the present invention, the thickness of the shielding layer is 15-200 μm, and the thickness of the shielding composite film is 80-1000 μm.

[0059] Furthermore, based on the above technical solution of the present invention, the cross-sectional area of ​​the ray channel is a quadrilateral.

[0060] Furthermore, based on the above technical solution of the present invention, positioning holes are opened or positioning blocks are arranged on the end surface of the two-dimensional grid along the parallel ray channel.

[0061] Furthermore, based on the above technical solution of the present invention, a carbon fiber plate is provided on at least one end surface of the two-dimensional grid along the parallel ray channel.

[0062] Further, based on the above technical solution of the present invention, the focal length of the two-dimensional grid is 0.6-1.8m;

[0063] And / or, the grid ratio of the two-dimensional grid is (5-21):1;

[0064] And / or, the line density of the two-dimensional grid in the X-axis is 36-125 / cm;

[0065] And / or, the linear density of the two-dimensional filter grid on the Y axis is 36-125 / cm.

[0066] The present invention also provides an X-ray device, comprising the one-dimensional grid or the two-dimensional grid.

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] (1) The present invention provides a shielding material composition, which is made of a specific amount of a shielding agent, a solvent, a dispersant and a binder, wherein the shielding agent is selected by selecting a specific type of a first shielding agent and / or a second shielding agent, so that the shielding material composition has a good shielding and protection effect against X-rays or gamma rays. At the same time, the shielding agent has a good coordination effect with the solvent, the dispersant and the binder, which provides a basis for the subsequent preparation of a shielding layer and a shielding composite film.

[0069] (2) The present invention provides a shielding layer, which is made of the above-mentioned shielding material composition. In view of the advantages of the above-mentioned shielding material composition, the shielding layer has a good shielding effect against X-rays or gamma rays.

[0070] (3) The present invention provides a method for preparing a shielding layer. The method has a simple process and is easy to operate. Compared with traditional metal foils, the method has fewer preparation steps and lower costs, and is suitable for industrial-scale production.

[0071] (4) The present invention provides a shielding composite film that can achieve selective transmission and shielding of X-rays or gamma rays and has good application prospects.

[0072] (5) The present invention provides a method for preparing a shielding composite film, which has simple operation and stable process.

[0073] (6) The present invention also provides an application of the above-mentioned shielding layer or shielding composite film. In view of the advantages of the above-mentioned shielding layer or shielding composite film, it has good application prospects in the field of shielding X-rays or gamma rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0075] Figure 1 A schematic diagram of the structure of a shielding composite film according to an embodiment of the present invention;

[0076] Figure 2 A schematic diagram of the structure of a one-dimensional grid according to an embodiment of the present invention;

[0077] Figure 3 A schematic structural diagram of a two-dimensional filter grid according to an embodiment of the present invention.

[0078] Icon: 10-shielding layer; 20-base layer; 30-shielding composite film; 40-adhesive layer. DETAILED DESCRIPTION

[0079] The embodiments of the present invention will be described in detail below in conjunction with the embodiments and examples, but it will be appreciated by those skilled in the art that the following embodiments and examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific conditions are specified, the conditions are carried out according to normal conditions or manufacturer recommendations. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0080] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. These 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 direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0081] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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 an indirect connection 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.

[0082] According to a first aspect of the present invention, there is provided a shielding material composition comprising the following raw materials:

[0083] Shielding agent 30-98%, solvent 1-40%, dispersant 0-5% and binder 1-40%;

[0084] Wherein, the shielding agent includes a first shielding agent and / or a second shielding agent;

[0085] The first shielding agent includes any one of molybdenum powder, tantalum powder, tin powder or antimony powder, or a combination of at least two thereof;

[0086] The second shielding agent includes any one of molybdenum oxide, tantalum oxide, tin oxide or antimony oxide, or a combination of at least two thereof.

[0087] Specifically, the shielding agent in the present invention is mainly used to shield X-rays or gamma rays. The first shielding agent mainly includes at least one of molybdenum powder, tantalum powder or antimony powder, that is, the first shielding agent can be selected from one of the above metal element powders, or a combination of any two or three of the above metal element powders.

[0088] The second shielding agent includes at least one of molybdenum oxide, tantalum oxide or antimony oxide, that is, the second shielding agent can be selected from one of the above metal oxides, or a combination of any two or three of the above metal oxides.

[0089] The word “and / or” in “the shielding agent includes the first shielding agent and / or the second shielding agent” means that the shielding agent may include only the first shielding agent, may include only the second shielding agent, or may include both the first shielding agent and the second shielding agent.

[0090] The first shielding agent and / or the second shielding agent of the above-mentioned specific type has high density, high atomic number, good stability and no radioactive toxicity, is easy to obtain and easy to process, and has good shielding and protection effect against X-rays or gamma rays.

[0091] The amount of shielding agent in the shielding material composition is directly related to the shielding effect for X-rays or gamma rays. In the present invention, the mass fraction of typical but non-limiting shielding agent is 30%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, 85%, 88%, 90%, 92%, 95%, 96% or 98%.

[0092] Different from the traditional method of using metal foil (such as lead foil) as a shielding layer, the shielding agent in the present invention mainly exists in the form of powder or particles, which can reduce the production steps in the traditional foil production process and thus reduce the production cost.

[0093] The solvent, dispersant and binder are mainly used for the dispersion and molding of the shielding agent so that the shielding material composition can be used for the preparation of the shielding layer later.

[0094] The typical but non-limiting mass fraction of the solvent is 1%, 5%, 8%, 10%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38% or 40%. The typical but non-limiting mass fraction of the dispersant is 0%, 0.5%, 1%, 2%, 3%, 4% or 5%. The typical but non-limiting mass fraction of the binder is 1%, 5%, 8%, 10%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38% or 40%.

[0095] It should be noted that "comprising" in the present invention means that in addition to the raw materials, other raw materials may be included, and these components give the shielding material composition different properties. In addition, the "comprising" in the present invention can also be replaced by the closed "for" or "made of...".

[0096] The first shielding agent and the second shielding agent in the present invention can be further optimized based on the above.

[0097] As an optional embodiment of the present invention, the first shielding agent further includes any one of tungsten powder, bismuth powder or lead powder, or a combination of at least two of them.

[0098] As an optional embodiment of the present invention, the second shielding agent further includes any one of tungsten oxide, bismuth oxide, lead oxide or barium sulfate, or a combination of at least two thereof.

[0099] When the shielding agent does not include lead powder or lead-containing substances (lead oxide), the shielding material composition formed at this time is substantially a lead-free product. On the contrary, when the shielding agent includes lead powder or lead-containing substances (lead oxide), the shielding material composition formed at this time is substantially a lead-containing product. Therefore, different shielding material compositions can be selected according to actual needs.

[0100] In the present invention, since there are many types of first shielding agents and second shielding agents, there are many specific combinations of shielding agents. In order to further improve the technical effect, the specific combination of shielding agents is further optimized.

[0101] There are three situations:

[0102] (1) The shielding agent includes only the first shielding agent.

[0103] As a preferred embodiment of the present invention, the shielding agent includes a first shielding agent, the first shielding agent includes tungsten powder and tantalum powder, and the mass ratio of tungsten powder to tantalum powder is (0.5-99.5):(0.5-99.5). Typical but non-limiting mass ratios of tungsten powder to tantalum powder are 0.5:0.5, 0.5:1, 0.5:10, 0.5:20, 0.5:40, 0.5:60, 0.5:80, 0.5:90, 0.5:99.5, 20:0.5, 20:1, 20:10, 20:20, 20:40, 20:60, 20:80, 20:90, 20:99.5, 50:0.5, 50:1, 50:10, 50:20, 50:40, 50:60, 50:80, 50:90, 50:99.5, 50:0.5, 50:1, 50:10, 50:20, 50:40, 50:60, 50:80, 50:90, 50:99.5, 50:0.5, 50:1 0:20, 50:40, 50:60, 50:80, 50:90, 50:99.5, 80:0.5, 80:1, 80:10, 80:20, 80:40, 80:60, 80:80, 80:90, 80:99.5, 99:0.5, 99:1, 99:10, 99:20, 99:40, 99:60, 99:80, 99:90, 99:99.5, or 99.5:0.5.

[0104] As a preferred embodiment of the present invention, the shielding agent includes a first shielding agent, and the first shielding agent includes lead powder, tungsten powder, molybdenum powder and tantalum powder, and the mass ratio of the lead powder, tungsten powder, molybdenum powder and tantalum powder is (1-40): (1-80): (1-50): (1-20). Typical but non-limiting mass ratios of lead powder, tungsten powder, molybdenum powder and tantalum powder are 1:1:1:1, 10:1:1:1, 20:1:1:1, 30:1:1:1, 40:1:1:1, 10:20:10:10, 10:30:40:10, 10:40:40:10, 10:50:50:20, 10:60:50:20, 10:80:50:20, 20: : 10:10:10, 20:40:30:10, 20:50:20:10, 20:80:50:10, 40:10:10:10, 40:20:10:10, 40:30:10:20, 40:40:10:10, 40:50:10:10, 40:60:40:10, 40:60:50:20 or 40:80:50:20.

[0105] (2) The shielding agent includes only the second shielding agent.

[0106] As a preferred embodiment of the present invention, the shielding agent includes a second shielding agent, and the second shielding agent includes tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide, and the mass ratio of tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide is (1-30): (1-30): (1-40): (1-80): (1-20). Typical but non-limiting mass ratios of tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide, and antimony oxide are 1:1:1:1:1, 10:1:1:1:1, 20:1:1:1:1:1, 30:1:1:1:1, 1:10:1:1:1, 10:10:10:1:1, 20:10:10:10:1, 30:20:10:20:20, 30:10:10:30:20, 30:20:30:20:10, 30:30:40:40:20, 30:30:40:50:20, 30:30:40:60:20, or 30:30:40:80:20.

[0107] (3) The shielding agent includes a first shielding agent and a second shielding agent.

[0108] As a preferred embodiment of the present invention, the shielding agent comprises tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide, and the mass ratio of tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide is (1-30): (1-30): (1-40): (1-80). Typical but non-limiting mass ratios of tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide are 1:1:1:1, 10:1:1:1, 20:1:1:1, 30:1:1:1, 10:20:10:10, 10:30:40:10, 10:30:40:20, 10:30:40:50, 10:30:40:60, 10:30:40:80, 20:10: : 10:10, 20:30:30:10, 20:30:40:30, 20:30:40:50, 30:10:10:10, 30:20:10:10, 30:30:10:20, 30:30:30:40, 30:30:40:40, 30:30:40:50, 30:30:40:60 or 30:30:40:80.

[0109] By further optimizing the specific types of shielding agents, the shielding material composition has a better shielding and protective effect for X-rays or gamma rays.

[0110] As an optional embodiment of the present invention, the particle size of each raw material in the shielding agent is micron level.

[0111] For example, lead powder may be 0.5-100 μm; tungsten powder 0.2-100 μm; molybdenum powder 0.2-100 μm; tungsten oxide 0.1-30 μm; molybdenum oxide 0.1-30 μm; tantalum oxide 0.1-30 μm; and bismuth oxide powder 0.1-30 μm.

[0112] The dispersant is mainly used to achieve a good dispersion effect of the shielding agent. In an optional embodiment of the present invention, the dispersant includes any one of glycerol, stearic acid, oleic acid or zinc stearate, or a combination of at least two of them.

[0113] As an optional embodiment of the present invention, the binder includes any one of polyvinylbutyral (PVB), methyl cellulose, polyurethane or polymethyl methacrylic (PMMA) or a combination of at least two of them.

[0114] By limiting the specific type of the binder, it can form a stable and high-viscosity shielding material composition (in the form of slurry) with the shielding agent, dispersant and solvent, which is conducive to the subsequent curing of the solvent into a film to form a shielding layer after volatilization.

[0115] As an optional embodiment of the present invention, the viscosity of the slurry formed by the shielding material composition is 8000-120000 mPa·s. Typical but non-limiting slurry viscosities are 8000 mPa·s, 9000 mPa·s, 10000 mPa·s, 20000 mPa·s, 30000 mPa·s, 40000 mPa·s, 50000 mPa·s, 60000 mPa·s, 70000 mPa·s, 80000 mPa·s, 90000 mPa·s, 100000 mPa·s, 110000 mPa·s or 120000 mPa·s.

[0116] By further limiting the viscosity of the slurry, the shielding agent in the slurry has good stability and will not precipitate. At the same time, the slurry has good fluidity and is easy to form. If the viscosity of the slurry is lower than 8000mPa·s, the shielding agent in the slurry is easy to settle, resulting in uneven products. When it is higher than 120000mPa·s, the slurry has poor fluidity or even no fluidity, resulting in the inability to form in the later stage.

[0117] As an optional embodiment of the present invention, the solvent includes any one of water, ethanol or ketone solvents, or a combination of at least two of them.

[0118] According to a second aspect of the present invention, there is also provided a shielding layer, which is made of the above-mentioned shielding material composition, and the density of the shielding layer is 3-13g / cm 3 .

[0119] The density of the shielding layer is directly related to the shielding ability of the shielding layer for X-rays or gamma rays. In the present invention, the typical but non-limiting density of the shielding layer is 3g / cm 3 , 4g / cm 3 , 5g / cm 3 , 6g / cm 3 , 8g / cm 3 、10g / cm 3 , 12g / cm 3 or 13g / cm 3 If the density of the shielding layer is less than 3g / cm 3 , it is easy to cause the shielding ability of the shielding layer to be low for X-rays or gamma rays. If the density of the shielding layer is higher than 13g / cm 3 , the above-mentioned shielding material composition cannot form a uniform slurry and thus cannot be formed into a shielding layer.

[0120] In view of the advantages of the above-mentioned shielding material composition, the shielding layer formed therefrom also has the same advantage, that is, the shielding layer has a good shielding effect against X-rays or gamma rays.

[0121] As an optional embodiment of the present invention, the thickness of the shielding layer is 0.01-3 mm. The typical but non-limiting thickness of the shielding layer is 0.01 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0122] According to a third aspect of the present invention, there is also provided a method for preparing the above-mentioned shielding layer, comprising the following steps:

[0123] The slurry formed by mixing the shielding agent, the solvent, the dispersant and the binder is coated into a film to obtain a shielding layer;

[0124] The viscosity of the formed slurry is 8000 to 120000 mPa·s.

[0125] The preparation method of the shielding layer has simple process and convenient operation. Compared with traditional metal foils, the preparation process is less and the cost is low, so the shielding layer is suitable for industrial-scale production.

[0126] According to a fourth aspect of the present invention, there is also provided a shielding composite film, comprising a shielding layer 10 and a base layer 20, wherein the shielding layer 10 is disposed on one side surface of the base layer 20, and the specific structure is as follows: Figure 1 shown.

[0127] The shielding layer is made of the above shielding material composition, and the density of the shielding layer is 3-13g / cm 3 .

[0128] In the shielding composite film, the shielding layer is mainly used for shielding and protecting X-rays or gamma rays, and the base layer is mainly used for achieving the penetration of X-rays or gamma rays.

[0129] The number of shielding layers and base layers in the shielding composite film is not limited, and they can be all one layer or multiple layers. When the shielding layer and base layer are multiple layers, the shielding layer and the base layer are alternately stacked.

[0130] The shielding composite film provided by the present invention can realize the selective penetration and shielding of X-rays or gamma-rays and has good application prospects.

[0131] In the prior art, metal foil (such as aluminum foil) is usually selected as the base layer, but its density is large and the radiation penetration is poor. Therefore, the present invention further optimizes the material of the base layer.

[0132] As an optional embodiment of the present invention, the material of the base layer includes any one of tetrafluoroethylene, polyvinyl chloride (PVC), polyvinyl butyral (PVB), polyethylene (PE), graphite paper, aluminum foil, paper or carbon fiber.

[0133] The material of the substrate layer has low absorption capacity for X-rays or gamma rays, and is easy to transmit, so that image quality requirements can be achieved without adding a large radiation dose compared to traditional aluminum foil during diagnosis. At the same time, the material is a relatively easy-to-obtain standard industrial product coil and can be used as a molding substrate.

[0134] As an optional embodiment of the present invention, the thickness of the base layer is 0.05-10 mm. Typical but non-limiting thicknesses of the base layer are 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 9 mm or 10 mm.

[0135] As an optional embodiment of the present invention, the thickness of the shielding layer is 0.01-3 mm. The typical but non-limiting thickness of the shielding layer is 0.01 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm.

[0136] According to a fifth aspect of the present invention, there is also provided a method for preparing the above-mentioned shielding composite film, comprising the following steps:

[0137] The shielding layer formed by the shielding material composition is arranged on one side surface of the substrate layer to obtain a shielding composite film.

[0138] The preparation method of the shielding composite film is simple to operate and has a stable process.

[0139] As an optional embodiment of the present invention, the method for preparing the shielding composite film comprises the following steps:

[0140] After the shielding agent and the solvent are mixed, a dispersant is added for grinding, and then separated to obtain a dispersed material;

[0141] The slurry formed by mixing the dispersed material and the binder is coated on the base layer and dried to form a shielding layer on one side surface of the base layer to obtain a shielding composite film.

[0142] Specifically, grinding can refine the particle size of the shielding agent, so that the shielding agent has good fluidity and stability in the slurry.

[0143] As an optional embodiment of the present invention, the grinding is ball milling.

[0144] As an optional embodiment of the present invention, the grinding time is 4-24 hours. Typical but non-limiting grinding times are 4 hours, 6 hours, 8 hours, 10 hours, 12 hours, 14 hours, 15 hours, 18 hours, 20 hours, 22 hours or 24 hours.

[0145] As an optional embodiment of the present invention, the viscosity of the slurry is 8000-120000 mPa.s.

[0146] As an optional embodiment of the present invention, the coating speed is 0.2-5m / min. Typical but non-limiting coating speeds are 0.2m / min, 0.5m / min, 0.8m / min, 1.0m / min, 1.5m / min, 2.0m / min, 2.5m / min, 3.0m / min, 3.5m / min, 4.0m / min, 4.5m / min or 5.0m / min.

[0147] If the coating speed is too low, the production efficiency will be low, the uniformity of the slurry will decrease, and the film quality will be affected. If the coating speed is too fast, the uniformity of the film thickness may be poor, which will also affect the film quality. It can be seen that by optimizing the coating speed during the coating process, a certain production efficiency is guaranteed, while also ensuring the film quality.

[0148] As an optional embodiment of the present invention, the drying temperature is 20-120° C. Typical but non-limiting drying temperatures are 20° C., 40° C., 50° C., 60° C., 70° C., 80° C., 90° C., 100° C., 110° C. or 120° C.

[0149] When the drying temperature is too low (below 20°C), the slurry cannot be cured into a film within a certain coating speed range. When the drying temperature is too high (above 120°C), it is easy to cause deformation of the base layer, causing the base layer and the shielding layer to be distorted.

[0150] According to a sixth aspect of the present invention, there is also provided the use of the above-mentioned shielding layer or shielding composite film in the field of shielding X-rays or gamma rays.

[0151] In view of the advantages of the above-mentioned shielding layer or shielding composite film, it has good application prospects in the field of shielding X-rays or gamma rays.

[0152] According to a seventh aspect of the present invention, there is also provided a one-dimensional grid, which is made of the above-mentioned shielding layer or the above-mentioned shielding composite film.

[0153] In view of the advantages of the above-mentioned shielding layer or shielding composite film, the one-dimensional grid made of the shielding layer or the shielding composite film can selectively transmit and shield X-rays or gamma rays, thereby reducing the influence of scattered rays on image quality.

[0154] The structure of the one-dimensional grid can be of various types, such as a parallel grid or a converging grid.

[0155] As an optional embodiment of the present invention, a one-dimensional filter grid is used in conjunction with a tube of an X-ray device, comprising a plurality of shielding composite films 30, wherein the shielding composite films 30 include a shielding layer 10 and a substrate layer 20, wherein a plurality of the shielding composite films are stacked, and any two adjacent shielding composite films 30 are connected by an adhesive layer 40 to form an integrated module, and the specific structure is as follows: Figure 2 It should be noted that Figure 2 It is just a structural diagram of one implementation of a one-dimensional filter grid.

[0156] As an optional embodiment of the present invention, the material of the base layer includes any one of tetrafluoroethylene, PVC, polyvinyl butyral, PE, graphite paper, aluminum foil, paper or carbon fiber.

[0157] As an optional implementation of the present invention, the thickness of the shielding layer is 20-200 μm, and the thickness of the base layer is 80-1000 μm.

[0158] As an optional implementation of the present invention, positioning holes are provided or positioning blocks are arranged on two end surfaces of the integrated module along the stacking direction of the shielding layer and the base layer.

[0159] As an optional embodiment of the present invention, a carbon fiber plate is provided on at least one end surface of the integrated module along a direction perpendicular to the stacking direction of the shielding layer and the base layer.

[0160] As an optional implementation of the present invention, the focal length of the one-dimensional grid is 0.6-1.8 m.

[0161] As an optional embodiment of the present invention, the grid ratio of the one-dimensional grid is (5-8): 1. A typical but non-limiting grid ratio is 8:1, 10:1 or 5:1.

[0162] As an optional embodiment of the present invention, the linear density of the one-dimensional grid is 40-125 / cm, and a typical but non-limiting linear density is 40 / cm, 80 / cm, 85 / cm or 125 / cm.

[0163] There are many structures of one-dimensional grids, and therefore there are also many corresponding preparation methods.

[0164] As an optional embodiment of the present invention, a method for preparing a one-dimensional grid includes the following steps:

[0165] A plurality of shielding composite films are stacked and arranged, and any two adjacent shielding composite films are connected by an adhesive layer to form an integrated module;

[0166] A certain pressure is continuously applied to the two end surfaces of the integrated module along the stacking direction of the shielding layer and the base layer for a certain period of time, and then selectively sheared according to the product specifications to obtain a molded module;

[0167] Positioning holes or positioning blocks are provided on both end faces of the molding module along the stacking direction of the shielding layer and the base layer (the positioning blocks can be bonded by gluing), and the carbon fiber plates can be bonded on the channel end faces without gluing, on one side or on both sides according to design requirements to obtain a one-dimensional filter grid.

[0168] According to an eighth aspect of the present invention, there is also provided a two-dimensional grid, which is made of the above-mentioned shielding layer and the above-mentioned shielding composite film.

[0169] In view of the advantages of the above-mentioned shielding layer or shielding composite film, the two-dimensional grid made of the shielding layer or shielding composite film can selectively transmit and shield X-rays or gamma rays, while greatly reducing the influence of scattered rays on image quality.

[0170] As an optional embodiment of the present invention, the two-dimensional filter grid includes a shielding composite membrane 30 and a shielding layer 10. A plurality of shielding composite membranes 30 are stacked, and any two adjacent shielding composite membranes 30 are connected by an adhesive layer 40 to form a molding module.

[0171] A plurality of molding modules are arranged along a direction perpendicular to the stacking direction of the shielding composite films 30, and the positions of the shielding composite films 30 in any two adjacent molding modules correspond one to one;

[0172] A shielding layer 10 is arranged between any two adjacent molding modules, and the molding module and the shielding layer 10 are connected by an adhesive layer 40. The shielding layer 10 is arranged along the stacking direction of the shielding composite film 30. The two adjacent shielding layers 10 and the shielding composite film 30 between the two shielding layers enclose a ray channel. The specific structure is as follows Figure 3 shown.

[0173] As an optional embodiment of the present invention, the shielding layer has a thickness of 15-200 μm; a typical but non-limiting thickness of the shielding layer is 15 μm, 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm or 200 μm.

[0174] As an optional embodiment of the present invention, the shielding composite film has a thickness of 80-1000 μm; a typical but non-limiting thickness of the shielding composite film is 80 μm, 100 μm, 200 μm, 500 μm, 600 μm, 800 μm or 1000 μm.

[0175] The bonding layer is mainly used to achieve the connection between two adjacent shielding composite films, and the connection between the molding module and the shielding layer. The bonding layer can be formed by the adhesive of the material itself, or by applying glue on the surface of the material (such as the base layer).

[0176] As an optional implementation of the present invention, the cross-sectional area of ​​the ray channel is a quadrilateral. There are many types of quadrilaterals, such as square, rectangle, parallelogram, rhombus, trapezoid, etc.

[0177] As an optional implementation of the present invention, positioning holes are provided or positioning blocks are arranged on the end surface of the two-dimensional grid along the parallel ray channel.

[0178] As an optional embodiment of the present invention, a carbon fiber plate is provided on at least one end surface of the two-dimensional grid along the parallel ray channel.

[0179] As an optional embodiment of the present invention, the focal length of the two-dimensional grid is 0.6-1.8 m; typical but non-limiting focal lengths are 0.6 m, 0.8 m, 1.0 m, 1.2 m, 1.5 m, 1.6 m or 1.8 m.

[0180] As an optional embodiment of the present invention, the grid ratio of the two-dimensional grid is (5-21):1; a typical but non-limiting grid ratio is 8:1, 10:1, 16:1 or 21:1.

[0181] As an optional embodiment of the present invention, the linear density of the two-dimensional grid in the X-axis is 36-125 / cm, and a typical but non-limiting linear density is 36 / cm, 40 / cm, 80 / cm, 85 / cm or 125 / cm.

[0182] As an optional embodiment of the present invention, the linear density of the Y-axis of the two-dimensional grid is 36-125 / cm, and a typical but non-limiting linear density is 36 / cm, 40 / cm, 80 / cm, 85 / cm or 125 / cm.

[0183] There are many structures of two-dimensional grids, and therefore there are also many corresponding preparation methods.

[0184] As an optional embodiment of the present invention, a method for preparing a two-dimensional grid includes the following steps:

[0185] (a) stacking a plurality of shielding composite films, and connecting any two adjacent shielding composite films via an adhesive layer to form a molding module;

[0186] (b) providing an adhesive layer and a shielding layer on the end surface of the molding module along a direction perpendicular to the stacking direction of the shielding composite film, wherein the adhesive layer is provided between the molding module and the shielding layer;

[0187] (c) Then, an adhesive layer and a molding module are arranged on the surface of the shielding layer away from the molding module, and it is necessary to ensure that the positions of the shielding layers in the molding modules on both sides of the shielding layer correspond one to one, and the positions of the base layers in the molding modules on both sides of the shielding layer correspond one to one;

[0188] Repeat steps (b) and (c) to achieve an alternating stacking arrangement of the forming modules and the shielding layers to obtain a two-dimensional filter grid.

[0189] It should be noted that it is necessary to ensure that the positions of the shielding layers in the molding modules on both sides of the shielding layer correspond one to one, and the positions of the base layers in the molding modules on both sides of the shielding layer correspond one to one, so that the two adjacent shielding layers and the shielding composite film layer between the two shielding layers are enclosed to form a ray channel, so that the two-dimensional filter grid has a grid-like structure, so that the scattered rays passing through it are completely eliminated.

[0190] According to a ninth aspect of the present invention, there is further provided an X-ray device comprising the above-mentioned one-dimensional grid or the above-mentioned two-dimensional grid.

[0191] The other structures and structural position relationships of the X-ray equipment are prior art and will not be described in detail here.

[0192] By combining the advantages of the one-dimensional grid or the two-dimensional grid, the X-ray device has a good imaging effect.

[0193] The present invention will be further described below in conjunction with specific embodiments and comparative examples.

[0194] Example 1

[0195] This embodiment provides a shielding material composition, including the following raw materials:

[0196] Shielding agent 60%, solvent 30%, dispersant 2% and binder 8%;

[0197] Wherein, based on the mass of the shielding agent being 100%, the shielding agent is mainly made of the following raw materials in the following mass fractions: 50% lead powder, 30% tungsten powder, 10% molybdenum powder and 10% tantalum powder;

[0198] The solvent is water, the dispersant is glycerol, and the binder is polyvinyl butyral.

[0199] The viscosity of the slurry formed by the shielding material composition is 51000 mPa.s.

[0200] Example 2

[0201] This embodiment provides a shielding material composition, including the following raw materials:

[0202] Shielding agent 65%, solvent 30%, dispersant 0.5% and binder 4.5%;

[0203] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 80% of tungsten powder and 20% of tantalum powder;

[0204] The solvent is water, the dispersant is oleic acid, and the binder is polyurethane.

[0205] The viscosity of the slurry formed by the shielding material composition is 48000 mPa.s.

[0206] Example 3

[0207] This embodiment provides a shielding material composition, including the following raw materials:

[0208] Shielding agent 96%, solvent 2%, dispersant 0.5% and binder 1.5%;

[0209] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 50% of molybdenum powder, 40% of tantalum powder and 10% of antimony powder;

[0210] The solvent is water, the dispersant is oleic acid, and the binder is polyvinyl butyral.

[0211] The viscosity of the slurry formed by the shielding material composition is 87400 mPa.s.

[0212] Example 4

[0213] This embodiment provides a shielding material composition, except that the shielding agent is made of molybdenum powder with a mass fraction of 100%, the other raw materials and amounts are the same as those in Example 3;

[0214] The viscosity of the slurry formed by the shielding material composition is 73500 mPa.s.

[0215] Example 5

[0216] This embodiment provides a shielding material composition, except that the shielding agent is made of tantalum powder with a mass fraction of 100%, the other raw materials and amounts are the same as those in Example 3;

[0217] The viscosity of the slurry formed by the shielding material composition is 59600 mPa.s.

[0218] Example 6

[0219] This embodiment provides a shielding material composition, except that the shielding agent is made of 100% antimony powder by mass, and the other raw materials and amounts are the same as those in Example 3;

[0220] The viscosity of the slurry formed by the shielding material composition is 93300 mPa.s.

[0221] Example 7

[0222] This embodiment provides a shielding material composition, including the following raw materials:

[0223] Shielding agent 88.5%, solvent 4%, dispersant 2% and binder 5.5%;

[0224] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 90% of molybdenum oxide, 6% of tantalum oxide and 4% of antimony oxide;

[0225] The solvent is water, the dispersant is glycerol, and the binder is methyl cellulose.

[0226] The viscosity of the slurry formed by the shielding material composition is 65800 mPa.s.

[0227] Example 8

[0228] This embodiment provides a shielding material composition. Except that the shielding agent is made of 58% by mass of molybdenum oxide and 42% by mass of tantalum oxide, the other raw materials and amounts are the same as those in Example 7.

[0229] Example 9

[0230] This embodiment provides a shielding material composition. Except that the shielding agent is made of 66% tantalum oxide and 34% antimony oxide by mass, the other raw materials and amounts are the same as those in Example 7.

[0231] Example 10

[0232] This embodiment provides a shielding material composition. Except that the shielding agent is made of 100% molybdenum oxide by mass, the other raw materials and amounts are the same as those in Example 7.

[0233] Embodiment 11

[0234] This embodiment provides a shielding material composition. Except that the shielding agent is made of tantalum oxide with a mass fraction of 100%, the other raw materials and amounts are the same as those in Example 7.

[0235] Example 12

[0236] This embodiment provides a shielding material composition. Except that the shielding agent is made of 100% antimony oxide by mass, the other raw materials and amounts are the same as those in Example 7.

[0237] Example 13

[0238] This embodiment provides a shielding material composition, including the following raw materials:

[0239] Shielding agent 60%, solvent 30%, dispersant 1% and binder 9%;

[0240] Wherein, based on the mass of the shielding agent being 100%, the shielding agent is mainly made of the following raw materials in the following mass fractions: 20% tungsten oxide, 20% molybdenum oxide, 20% tantalum oxide, 20% bismuth oxide and 20% antimony oxide;

[0241] The solvent is water, the dispersants are glycerol and stearic acid, the mass ratio of glycerol to stearic acid is 2:3, and the binder is polyurethane.

[0242] The viscosity of the slurry formed by the shielding material composition is 14000 mPa.s.

[0243] Embodiment 14

[0244] This embodiment provides a shielding material composition, including the following raw materials in mass fractions:

[0245] Shielding agent 72%, solvent 20%, dispersant 0.5% and binder 7.5%;

[0246] Wherein, based on the mass of the shielding agent being 100%, the shielding agent is mainly made of the following raw materials in the following mass fractions: 80% of tantalum powder, 10% of antimony powder, 8% of tantalum oxide and 2% of antimony oxide;

[0247] The solvent is water, the dispersant is sodium metaphosphate, and the binder is polyurethane.

[0248] The viscosity of the slurry formed by the shielding material composition is 53000 mPa.s.

[0249] Embodiment 15

[0250] This embodiment provides a shielding material composition, including the following raw materials in mass fractions:

[0251] Shielding agent 66%, solvent 20%, dispersant 1.5% and binder 12.5%;

[0252] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 50% of tungsten powder, 30% of tungsten oxide, 10% of molybdenum oxide and 10% of tantalum oxide;

[0253] The solvent is water, the dispersant is stearic acid, and the binder is methyl cellulose.

[0254] The viscosity of the slurry formed by the shielding material composition is 22000 mPa.s.

[0255] Example 16

[0256] This embodiment provides a shielding material composition, except that the mass fraction of the shielding agent is adjusted from 60% to 55.4%, and the mass fraction of the solvent is adjusted from 30% to 34.6%, so that the mass fraction of the shielding agent in the solvent is adjusted from 200% to 160%, the remaining raw materials and amounts are the same as those in Example 1.

[0257] Embodiment 17

[0258] This embodiment provides a shielding material composition, except that the mass fraction of the shielding agent is adjusted from 66% to 68.1%, and the mass fraction of the solvent is adjusted from 20% to 17.9% so that the mass fraction of the shielding agent in the solvent is adjusted from 330% to 380%, the remaining raw materials and amounts are the same as those in Example 15.

[0259] Comparative Example 1

[0260] This comparative example provides a shielding material composition, comprising the following raw materials:

[0261] Shielding agent 80%, solvent 10%, dispersant 1% and binder 9%;

[0262] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 80% of tungsten powder and 20% of bismuth powder;

[0263] The solvent is water, the dispersant is oleic acid, and the binder is polyurethane.

[0264] The viscosity of the slurry formed by the shielding material composition is 46000 mPa.s.

[0265] Comparative Example 2

[0266] This comparative example provides a shielding material composition, comprising the following raw materials in mass fractions:

[0267] Shielding agent 55%, solvent 28%, dispersant 2% and binder 15%;

[0268] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 50% of tungsten oxide and 50% of bismuth oxide;

[0269] The solvent is water, the dispersants are glycerol and stearic acid, the mass ratio of glycerol to stearic acid is 2:3, and the binder is polyurethane.

[0270] The viscosity of the slurry formed by the shielding material composition is 16800 mPa.s.

[0271] Comparative Example 3

[0272] This comparative example provides a shielding material composition, comprising the following raw materials in mass fractions:

[0273] Shielding agent 70%, solvent 25%, dispersant 1% and binder 4%;

[0274] Wherein, taking the mass of the shielding agent as 100%, the shielding agent is mainly made of the following raw materials in mass fractions: 80% of tungsten oxide, 10% of lead oxide and 10% of tungsten powder;

[0275] The solvent is water, the dispersants are glycerol and stearic acid, the mass ratio of glycerol to stearic acid is 2:3, and the binder is polyurethane.

[0276] The viscosity of the slurry formed by the shielding material composition is 39000 mPa.s.

[0277] Embodiment 18

[0278] This embodiment provides a shielding layer, which is made of the shielding material composition provided in Example 1.

[0279] The method for preparing the shielding layer of this embodiment includes the following steps:

[0280] The shielding agent is added to the solvent and mixed, and then a dispersant is added for ball milling. The ball milling time is 24 hours, and then the ball milling balls and the solvent are filtered to obtain a dispersed material;

[0281] The slurry formed by mixing the dispersed material and the binder is coated on the base tape at a coating speed of 1m / min, and then the base tape is dried in a drying tunnel at 60-120°C to form a film, and then the film is separated from the base tape to obtain a shielding layer.

[0282] Examples 19-34

[0283] Examples 19-34 respectively provide a shielding layer, which is made of the shielding material composition provided by Examples 2-17 respectively.

[0284] The preparation method of the shielding layer provided in Examples 19-34 is the same as that in Example 18.

[0285] Comparative Examples 4-6

[0286] Comparative Examples 4-6 respectively provide a shielding layer, which is made of the shielding material composition provided by Comparative Examples 1-3 respectively.

[0287] The preparation method of the shielding layer provided in Comparative Examples 4-6 is the same as that in Example 18.

[0288] Embodiment 35

[0289] This embodiment provides a shielding composite film, comprising a shielding layer and a base layer, wherein the shielding layer is disposed on one side surface of the base layer;

[0290] The shielding layer is made of the shielding material composition provided in Example 1, the material of the base layer is tetrafluoroethylene, and the thickness of the base layer is 0.1 mm.

[0291] The method for preparing the shielding composite film of this embodiment comprises the following steps:

[0292] The shielding agent is added to the solvent and mixed, and then a dispersant is added for ball milling. The ball milling time is 48 hours, and then the ball milling balls and the solvent are filtered and separated to obtain a dispersed material;

[0293] The slurry formed by mixing the dispersed material and the binder is coated on the base layer at a coating speed of 0.6 m / min, and then passed through a drying tunnel at 60-120° C. to form a shielding layer on the base layer to obtain a shielding composite film.

[0294] Examples 36-51

[0295] Examples 36-51 respectively provide a shielding composite film, except that the shielding layers in the shielding composite film are respectively made of the shielding material compositions provided by Examples 2-17, and the remaining raw materials and the preparation method of the shielding composite film are the same as those of Example 35.

[0296] Embodiment 52

[0297] This embodiment provides a shielding composite film, except that the coating speed used in the preparation method of the shielding composite film is replaced from 0.6 m / min to 0.1 m / min, and the remaining steps are the same as Example 35.

[0298] Embodiment 53

[0299] This embodiment provides a shielding composite film, except that the coating speed used in the preparation method of the shielding composite film is replaced from 0.6 m / min to 6 m / min, and the remaining steps are the same as Example 35.

[0300] Embodiment 54

[0301] This embodiment provides a shielding composite film. Except that the material of the base layer is polyvinyl butyral, the rest of the structure and preparation method are the same as those of Example 35.

[0302] Embodiment 55

[0303] This embodiment provides a shielding composite film. Except that the material of the base layer is PVC, the rest of the structure and preparation method are the same as those of Example 35.

[0304] Embodiment 56

[0305] This embodiment provides a shielding composite film. Except that the material of the base layer is graphite paper, the rest of the structure and preparation method are the same as those of Example 46.

[0306] Embodiment 57

[0307] This embodiment provides a shielding composite film. Except that the material of the base layer is PE, the rest of the structure and preparation method are the same as those of Example 48.

[0308] Comparative Examples 7-9

[0309] Comparative Examples 7-9 respectively provide a shielding composite film. Except that the shielding layers in the shielding composite film are respectively made of the shielding material compositions provided by Comparative Examples 1-3, the remaining raw materials and the preparation method of the shielding composite film are the same as those in Example 35.

[0310] Examples 58-80

[0311] Examples 58-80 respectively provide a one-dimensional filter grid, which is made of the shielding composite membrane provided by Examples 35-57 respectively.

[0312] Specifically, the one-dimensional filter grid is used in conjunction with a tube of an X-ray device, and includes a plurality of shielding composite films, which are stacked to form an integrated module, and any two adjacent shielding composite films are connected by an adhesive layer;

[0313] An extension line of the shielding layer in the shielding composite film along the direction of the bulb and an extension line of the base layer in the shielding composite film along the direction of the bulb intersect at the focus of the bulb;

[0314] Positioning blocks are pasted on both end faces of the integrated module along the stacking direction of the shielding layer and the base layer, and carbon fiber plates are arranged on the two end faces of the integrated module along the stacking direction perpendicular to the shielding layer and the base layer to obtain a one-dimensional filter grid.

[0315] In order to compare the technical effects of the embodiments and comparative examples, the following experimental examples are specially set up.

[0316] Experimental Example 1

[0317] Taking Examples 18-21 and Example 24 as examples, the X-ray shielding performance of the shielding layer provided by the present invention is tested. Since the thickness of the shielding layer also has a great influence on the X-ray shielding performance, the following tests are performed under the same thickness of the shielding layer. Among them, the detection method of the absorption rate is based on YY / T0292.1-2020 / IEC61331-1:2014, and the specific results are shown in Table 1.

[0318] Table 1

[0319]

[0320]

[0321] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shielding composite film, characterized in that: It comprises a shielding layer and a base layer, wherein the shielding layer is arranged on one side surface of the base layer; The shielding layer is made of a shielding material composition, and the density of the shielding layer is 3-13 g / cm 3 ; The thickness of the base layer is 0.05-10 mm; the thickness of the shielding layer is 0.01-3 mm.

2. The shielding composite film according to claim 1, characterized in that: The shielding material composition comprises the following raw materials in mass fractions: Shielding agent 30-98%, solvent 1-40%, dispersant 0-5% and binder 1-40%; Wherein, the shielding agent includes a first shielding agent and / or a second shielding agent; The first shielding agent comprises any one of molybdenum powder, tantalum powder, tin powder or antimony powder, or a combination of at least two thereof; The second shielding agent includes any one of molybdenum oxide, tantalum oxide, tin oxide or antimony oxide, or a combination of at least two thereof.

3. The shielding composite film according to claim 2, characterized in that: The first shielding agent further comprises any one of tungsten powder, bismuth powder or lead powder, or a combination of at least two of them.

4. The shielding composite film according to claim 2, characterized in that: The second shielding agent further comprises any one of tungsten oxide, bismuth oxide, lead oxide or barium sulfate, or a combination of at least two thereof.

5. The shielding composite film according to claim 3, characterized in that: The second shielding agent further comprises any one of tungsten oxide, bismuth oxide, lead oxide or barium sulfate, or a combination of at least two thereof.

6. The shielding composite film according to claim 2, characterized in that: The shielding agent includes a first shielding agent, the first shielding agent includes tungsten powder and tantalum powder, the mass ratio of the tungsten powder to the tantalum powder is (0.5-99.5): (0.5-99.5), preferably 99:1; Or, the shielding agent includes a first shielding agent, the first shielding agent includes lead powder, tungsten powder, molybdenum powder and tantalum powder, and the mass ratio of the lead powder, tungsten powder, molybdenum powder and tantalum powder is (1-40): (1-80): (1-50): (1-20).

7. The shielding composite film according to claim 2, characterized in that: The shielding agent includes a second shielding agent, the second shielding agent includes tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide, and the mass ratio of tungsten oxide, molybdenum oxide, tantalum oxide, bismuth oxide and antimony oxide is (1-30): (1-30): (1-40): (1-80): (1-20); Or, the shielding agent includes a first shielding agent and the second shielding agent, and the shielding agent includes tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide, and the mass ratio of the tungsten powder, tungsten oxide, molybdenum oxide and tantalum oxide is (1-30): (1-30): (1-40): (1-80).

8. The shielding composite film according to any one of claims 2 to 7, characterized in that: The dispersant includes any one of glycerol, stearic acid, oleic acid or zinc stearate, or a combination of at least two of them.

9. The shielding composite film according to any one of claims 2 to 7, characterized in that: The binder includes any one of polyvinyl butyral, methyl cellulose, polyurethane or polymethyl methacrylate, or a combination of at least two of them.

10. The shielding composite film according to any one of claims 2 to 7, characterized in that: The solvent includes any one of water, ethanol or ketones, or a combination of at least two of them.

11. The shielding composite film according to claim 1, characterized in that: The material of the base layer includes any one of tetrafluoroethylene, polyvinyl chloride, polyvinyl butyral, polyethylene, graphite paper, aluminum foil, paper or carbon fiber.

12. The method for preparing the shielding composite film according to any one of claims 1 to 11, characterized in that: The following steps are involved: The shielding layer formed by the shielding material composition is arranged on one side surface of the base layer to obtain a shielding composite film.

13. The method for preparing the shielding composite film according to claim 12, characterized in that: The following steps are involved: After the shielding agent and the solvent are mixed, a dispersant is added for grinding, and then separated to obtain a dispersed material; The slurry formed by mixing the dispersed material and the binder is coated on the base layer, and dried to form a shielding layer on one side surface of the base layer to obtain a shielding composite film.

14. The method for preparing the shielding composite film according to claim 13, characterized in that: The viscosity of the slurry is 8000-120000 mPa.s.

15. The method for preparing the shielding composite film according to claim 13, characterized in that: The coating speed is 0.2-5 m / min.

16. The method for preparing the shielding composite film according to claim 13, characterized in that: The drying temperature is 20-120°C.

17. Use of the shielding composite film according to any one of claims 1 to 11 in the field of shielding X-rays or gamma rays.

18. A one-dimensional grid, characterized in that: It is made of the shielding composite film described in any one of claims 1-11.

19. The one-dimensional grid according to claim 18, characterized in that: The one-dimensional filter grid is used in conjunction with the tube of an X-ray device and comprises a plurality of shielding composite films, wherein the plurality of shielding composite films are stacked and any two adjacent shielding composite films are connected by an adhesive layer to form an integrated module.

20. The one-dimensional grid according to claim 19, characterized in that: The thickness of the shielding layer in the shielding composite film is 20-200 μm, and the thickness of the base layer is 80-1000 μm.

21. The one-dimensional grid according to claim 20, characterized in that: Positioning holes or positioning blocks are provided on both end surfaces of the integrated module along the stacking direction of the shielding layer and the base layer.

22. The one-dimensional grid according to claim 20, characterized in that: A carbon fiber plate is disposed on at least one end surface of the integrated module along a direction perpendicular to the stacking direction of the shielding layer and the base layer.

23. The one-dimensional grid according to any one of claims 18 to 22, characterized in that: The focal length of the one-dimensional grid is 0.6 to 1.8 m; And / or, the grid ratio of the one-dimensional grid is (5-8):1; And / or, the line density of the one-dimensional grid is 40-125 / cm.

24. An X-ray device, characterized in that: A one-dimensional grid comprising the one-dimensional grid as described in any one of claims 18 to 23.

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