CN115821479A - Fabric for radiation detection and imaging and preparation method thereof - Google Patents

Abstract

The invention belongs to flexible radiationThe technical field of detection, and discloses a fabric for radiation detection and imaging and a preparation method thereof. The method comprises the following steps: mixing a scintillator material and thermoplastic elastomer particles, preparing the mixture into fibers or fiber meshes, and weaving the fibers into a fabric or preparing the fibers into a non-woven fabric, thereby obtaining a flexible material with radiation detection and imaging functions, namely the fabric for radiation detection and imaging; the thermoplastic elastomer particles are more than one of SEBS, COCE and PP; the scintillator material is Gd ₂ O ₂ S：Tb、ZnS：Cu、Gd ₂ O ₂ S: more than one of Ce. The method is simple, and the prepared fabric has excellent radiation detection and X-ray imaging functions and is easy to prepare in batches. The fabric has wide application prospect in the fields of radiation detection and protection, flexible X-ray imaging and the like.

Description

Fabric for radiation detection and imaging and its preparation method

technical field

The invention belongs to the technical field of advanced functional fiber and fabric preparation, and in particular relates to a fabric for radiation detection and imaging and a preparation method thereof.

Background technique

High-energy rays such as X-rays and γ-rays are widely used in medical diagnosis and imaging, radiation therapy, industrial inspection, security inspection and nuclear industry. The detection and research of these rays require radiation detectors. Traditional radiation detectors mainly include semiconductor detectors and scintillator detectors, in which semiconductors can directly convert radiation into electrical signals. Common semiconductor detection materials include amorphous selenium (Se), amorphous silicon (Si), cadmium telluride (CdTe), thallium bromide (T1Br) and cadmium zinc telluride (Cd(Zn)Te), etc. The scintillator can convert high-energy rays into visible light, and then pass through the photomultiplier tube to realize the output of electrical signals through photoelectric conversion. Common scintillators can be divided into two categories: organic scintillators and inorganic scintillators. Due to the low density of organic scintillators, their absorption of high-energy rays is weak, which limits their development. There are many kinds of inorganic scintillators, which can meet different application occasions. The common inorganic scintillators include three types of scintillator crystals, scintillator glass and scintillator ceramics. At present, inorganic scintillators have been widely used in the field of radiation detection. For example, Zhou’s research group at South China University of Technology has developed a series of scintillation glasses and glass-ceramics doped with rare earth ions (such as Eu-doped silicate glass-ceramics, Tb-doped tungstate glass-ceramics, etc.), transparent scintillation ceramics (such as TeO ₂ -Bi ₂ O ₃ -Nb ₂ O ₅ , BaO-Al ₂ O ₃ -LaF ₃ -SiO _{2 ,} etc.) and scintillation fiber (such as Ce-doped Lu ₂ SiO ₅ glass fiber), etc., have achieved high efficiency and Highly sensitive radiation detection. In recent years, perovskite-like materials have been widely used in radiation detection and imaging due to their strong resistance, defect tolerance, large mobile lifetime, tunable bandgap, and simple single crystal growth. For example, in 2019, the Yang research group of Zhejiang University reported a semiconductor material (NH ₄ ) ₃ Bi ₂ I ₉ with a perovskite-like structure (Zhuang R, Wang X, Ma W, et al. Highly sensitive X-ray detector made of layered perovskite-like(NH ₄ ) ₃ Bi ₂ I ₉ single crystal with anisotropic response[J].Nature Photonics, 2019, 13(9):602-608.), this material has high radiation absorption efficiency and High carrier collection efficiency, enabling high-resolution imaging. In 2017, the Tang research group of Huazhong University of Science and Technology reported a lead-free perovskite single crystal (Cs ₂ AgBiBr ₆ ) X-ray detector (Pan W, Wu H, Luo J, eta1.Cs ₂ AgBiBr ₆ single-crystal X -ray detectors with a low detection limit[J].Nature Photonics, 2017, 11(11):726-732.), can detect low-dose X-rays and reduce radiation damage to the human body. In 2018, Huang's research group from Northwestern Polytechnical University and Liu's research group from the National University of Singapore jointly reported an all-inorganic perovskite nanocrystal (Chen Q, Wu J, Ou X, et a1.All-inorganic perovskitenanocrystal scintillators[J] .Nature, 2018, 561(7721): 88-93.), has important application prospects in X-ray detection and imaging.

At present, although various types of radiation detectors have been widely developed, most of them are rigid and difficult to be compatible with flexible electronic devices. It is imminent to develop flexible radiation detectors.

In the present invention, flexible radiation detection and imaging fibers and fabrics are prepared by two methods (ie thermal drawing method and melt spinning method) with scintillators and thermoplastic elastomers. The prepared fibers and fabrics have excellent radiation detection and imaging functions. And it is easy to prepare in batches, and the obtained radiation detection fabric has broad application prospects in the fields of radiation detection and protection, flexible X-ray imaging, medical monitoring and the like.

Contents of the invention

In order to overcome the disadvantages and deficiencies of the prior art, the object of the present invention is to provide a fabric for radiation detection and imaging and a preparation method thereof. The preparation process of the invention is simple and easy to implement, and the prepared flexible fabric has excellent radiation detection and imaging functions, and can be prepared in batches.

The object of the present invention is achieved through the following technical solutions:

A method for preparing a fabric for radiation detection and imaging, comprising the following steps: mixing scintillator material with thermoplastic elastomer particles and preparing it into a fiber or a fiber network, and then weaving the fiber into a fabric or preparing the fiber network into a non-woven fabric Spinning fabrics to obtain flexible materials with radiation detection and imaging functions, that is, radiation detection and imaging fabrics.

The method specifically includes thermal drawing method and melt spinning method,

The steps of the hot drawing method are as follows: kneading scintillator material and thermoplastic elastomer particles, forming by hot pressing, and hot drawing to obtain fibers, and then weaving the fibers into fabrics.

The steps of the melt spinning method are as follows: (1) Mix scintillator material and thermoplastic elastomer particles, put them in an extruder for melt spinning, and obtain fibers or nonwoven fabrics.

Specifically: (1) mixing the scintillator material with thermoplastic elastomer particles, and putting them into an extruder for melting to obtain a polymer melt; (2) extruding the polymer melt through a spinneret, and then Cool to obtain fibers; or extrude the polymer melt through the spinneret, and then draw in the room, and go through the steps of ribbon and rolling to obtain non-woven fabrics.

The thermoplastic elastomer particles are more than one of SEBS, COCE (cycloolefin copolymer elastomer), and PP;

The scintillator material is at least one of Gd ₂ O ₂ S:Tb, ZnS:Cu, and Gd ₂ O ₂ S:Ce.

In the thermal drawing method, the mass ratio of scintillator material to thermoplastic elastomer particles is 1:100~70:100, the temperature of hot pressing is 140~220°C, the temperature of hot drawing is 230~290°C, and the diameter of the obtained fiber is > 50μm;

In the melt spinning method, the mass ratio of scintillator material to elastomer particles is 1:100～10:100, the temperature in the extruder is 230～260°C, the mass flow rate is 10～30g/min, and the pressure is 3～6MPa ;

In the melt spinning method, the cooling temperature in the preparation of the fiber is 10-30°C, the relative humidity is 65%-90%, and the drawing speed is 80-100m/min; when it is made into a non-woven fabric, the drawing speed is 200-400m /min; the diameter of the obtained fiber is 50-500 μm.

The radiation detection and imaging fabric is used in the fields of flexible radiation detection, X-ray flexible imaging and the like.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) For the first time, the present invention combines scintillator materials into elastomeric fibers and fabrics to obtain flexible and elastic radiation detection fibers and fabrics, and realizes wearable radiation detection and flexible X-ray imaging.

(2) The radiation detection fiber and fabric of the present invention can be produced in large quantities, and the production process is short, the process is simple, the cost is low, and there is no environmental pollution.

Description of drawings

Fig. 1 is the fabric (A) prepared by embodiment 1 and its X-ray detection figure under bright field (B) and dark field (C) conditions; The radioactive source that adopts is the X-ray tube of low dosage;

Fig. 2 is the X-ray imaging diagram (B) of the elastic fabric prepared in embodiment 1, and the imaging sample adopted is electric vehicle smart key (A);

Fig. 3 is the non-woven fabric (A) prepared by embodiment 2 and its X-ray detection figure under bright field (B) and dark field (C) conditions;

Fig. 4 is the X-ray imaging diagram (B) of the nonwoven fabric prepared in Example 2, and the imaging sample adopted is an electric vehicle smart key (A).

Detailed ways

The present invention will be described in further detail below in conjunction with the examples, but the embodiments of the present invention are not limited thereto.

Example 1

(1) First weigh 42g of Gd ₂ O ₂ S:Tb powder (the doping amount of Tb in the scintillation material of this embodiment is 1mol%) and 18g of SEBS particles (manufacturer Kraton; model G1657), and mix the powder with The SEBS particles are mixed evenly, and then melted and mixed at 160°C for 10 minutes by an internal mixer; then the mixture is hot-pressed (180°C, 10MPa) on a hot press to form a square preform;

(2) Fix the prefabricated rod prepared in step (1) on an optical fiber drawing tower, pull it down at 260°C to make fibers, and then weave the obtained fibers into fabrics to obtain radiation detection fibers and fabrics.

Figure 1 is the fabric (A) prepared in Example 1 and its X-ray detection diagrams under bright field (B) and dark field (C) conditions.

Fig. 2 is the X-ray imaging diagram (B) of the elastic fabric prepared in Example 1, and the imaging sample adopted is an electric vehicle smart key (A) (the elastic fabric is wrapped on the surface of the imaging sample).

Example 2

(1) First weigh 100g of Gd ₂ O ₂ S:Tb powder (the doping amount of Tb in the scintillation material of this example is 1mol%) and 4900g of SEBS particles (manufacturer Kraton; model G1657), and mix them evenly;

(2) Use a single-screw extruder with a diameter of 25mm, an aspect ratio of 30, and a four-zone control system to melt and pressurize the mixture, wherein the screw extrusion temperature is 240°C, the mass flow rate is 25g/min, and the pressure is 4.5MPa, to obtain polymer melt;

(3) The polymer melt is extruded through a 60-hole spinneret (0.5mm in diameter per hole), then cooled in a cooling system with a temperature of 20°C and a relative humidity of 70%, and rolled to on the roll to get multi-filament;

(4) Alternatively, the polymer melt is extruded through a spinneret, and then drawn in a room with an air temperature of 30° C. and a speed of 300 m/min, and the non-woven fabric is prepared through ribbon and rolling steps.

Fig. 3 is the non-woven fabric (A) prepared in Example 2 and its X-ray detection diagram under bright field (B) and dark field (C) conditions.

Fig. 4 is the X-ray imaging diagram (B) of the nonwoven fabric prepared in Example 2, and the imaging sample adopted is an electric vehicle smart key (A) (the elastic fabric is wrapped on the surface of the imaging sample).

Claims (7)

1. A method for preparing a fabric for radiation detection and imaging, characterized in that: comprising the following steps: mixing scintillator material with thermoplastic elastomer particles and preparing it into a fiber or a fiber mesh, then weaving the fiber into a fabric or The fiber mesh is prepared into a non-woven fabric, so as to obtain a flexible material with radiation detection and imaging functions, that is, a radiation detection and imaging fabric; The thermoplastic elastomer particles are more than one of SEBS, COCE, and PP; The scintillator material is at least one of Gd ₂ O ₂ S:Tb, ZnS:Cu, and Gd ₂ O ₂ S:Ce. 2. according to the preparation method of the described radiation detection of claim 1 and the fabric of imaging, it is characterized in that: Described method specifically comprises hot-drawing method and melt-spinning method; The steps of the thermal drawing method are as follows: kneading the scintillator material with thermoplastic elastomer particles, forming by hot pressing, and hot drawing to obtain fibers, and then weaving the fibers into fabrics; The steps of the melt spinning method are as follows: (1) Mix scintillator material and thermoplastic elastomer particles, put them in an extruder for melt spinning, and obtain fibers or nonwoven fabrics. 3. The method for preparing the fabric for radiation detection and imaging according to claim 2, characterized in that: the mass ratio of the scintillator material to the thermoplastic elastomer particles in the hot drawing method is 1:100 to 70:100, and the hot-pressed The temperature is 140-220°C, the temperature of hot drawing is 230-290°C, and the diameter of the obtained fiber is above 50μm; In the melt spinning method, the mass ratio of scintillator material to elastomer particles is 1:100~10:100, the temperature in the extruder is 230~260°C, the mass flow rate is 10~30g/min, and the pressure is 3~6MPa . 4. The preparation method of the fabric for radiation detection and imaging according to claim 2, characterized in that: the specific steps of the melt spinning method are as follows: (1) mixing the scintillator material with the thermoplastic elastomer particles, and putting them into extrusion Melting in the machine to obtain a polymer melt; (2) extruding the polymer melt through a spinneret and then cooling to obtain fibers; or extruding the polymer melt through a spinneret and drawing in the chamber, After the steps of webbing and rolling, a non-woven fabric is obtained. 5. according to the preparation method of the described radiation detection and imaging fabric of claim 4, it is characterized in that: The fiber cooling temperature is 10-30°C, the relative humidity is 65%-90%, and the drawing speed is 80-100m/min; when it is made into a non-woven fabric, the drawing speed is 200-400m/min; the diameter of the obtained fiber is 50-500μm . 6. A fabric for radiation detection and imaging obtained by the preparation method described in any one of claims 1-5. 7. The application of the radiation detection and imaging fabric according to claim 6, characterized in that: the radiation detection and imaging fabric is used in the fields of flexible radiation detection and X-ray flexible imaging.

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