X-ray resistant fiber and its preparation method and application

Abstract

The present invention relates to an X-ray resistant fiber and a preparation method and application thereof. The X-ray resistant fiber comprises a fiber body and a pleated coating wrapped on the surface of the fiber body; the coating comprises a coating body and radiation-resistant particles I dispersed therein; the materials of the fiber body and the coating body are both elastic polymers; the preparation method of the X-ray resistant fiber is as follows: firstly spinning a spinning solution containing a fiber body material, radiation-resistant particles II and a solvent a to obtain a composite fiber, then using an impregnation solution containing a coating body material, radiation-resistant particles I and a solvent b to impregnate and finish the composite fiber in a pre-stretched state, removing the stretching force after drying, and obtaining the X-ray resistant fiber; the application is: making the X-ray resistant fiber into a functional layer of an X-ray resistant elastic fabric. The present invention effectively solves the problem that most lead-free clothing in the prior art has low radiation protection performance and poor wearing performance.

Description

Technical Field

[0001] The invention belongs to the technical field of X-ray protection, and relates to an X-ray irradiation-proof fiber and a preparation method and application thereof. Background Art

[0002] Radiation is a common phenomenon in life. For example, all kinds of electronic products such as mobile phones and computers will generate a certain amount of radiation. In medical applications, X-rays are often used for diagnostic examinations and radiotherapy. Studies have shown that just one X-ray exposure is equivalent to the amount of radiation the human body receives in a normal environment for several months. Since X-rays have a short wavelength and strong penetrating power, they will produce ionization when they enter the human body, causing biological changes in the human body. For example, proteins, enzymes or cell membranes are ionized and destroyed by X-ray irradiation, which can cause diseases and lead to harmful side effects. X-ray protective clothing can effectively reduce the radiation hazards to medical staff and patients. Therefore, the long-term and efficient protection performance of X-ray protective clothing is crucial.

[0003] The current X-ray protective clothing is mainly lead-containing protective clothing (mostly micro-lead protective clothing), which is made of lead plates integrated into the outer shell of textile clothing. Later, products such as lead-containing glass were gradually developed, which can be processed into protective clothing, radiation-proof gloves, radiation-proof helmets, etc. The thickness of the protective fabric made of lead plates is more than 5mm, which is airtight and hard. A lead apron with a lead equivalent of 0.5mmPb weighs 4.95kg, which will have a certain negative impact on medical staff when doing some precision movements; the mechanical properties of lead-containing protective clothing are poor, such as poor resilience and poor fatigue resistance, etc., and it is easy to break for parts that often bend, such as elbows and wrists, and then the protective performance is lost; at the same time, heavy metal lead is highly toxic and has certain harm to the human body. Lead will produce a series of waste gas, wastewater, etc. during the production process, which will cause large-scale pollution and have a negative impact on the environment. Therefore, it is necessary to further study an environmentally friendly lead-free material to effectively protect against X-rays.

[0004] "Ideal" environmentally friendly lead-free materials need to meet two basic requirements: the shielding efficiency of X-rays is above 90%; and it has good wearing performance for medical staff and patients. Common X-ray lead-free clothing mainly adds lanthanide and tungsten compounds to yarns and fabrics. Common methods include coating the fabric, wet spinning, melt spinning, etc. In recent years, many technologies have also disclosed the preparation and design routes of lead-free clothing, but most lead-free clothing has low radiation protection performance and poor wearing performance. For example: Patent CN109461511B discloses a method for preparing X-ray protective fabric and X-ray protective clothing, which is to attach nano-tantalum and tungsten oxide particles to silk threads, and set a coating with nano-tantalum and tungsten oxide on the surface of the cloth woven from the silk threads, but when the coating thickness is 0.5mm, the lead equivalent is only 0.24mmPb, and the protective effect for some special parts is not good enough. Patent CN104900282B discloses a method for preparing γ radiation protective clothing, which includes adding micro-nano-level γ radiation protective functional powder prepared by ball milling into a rubber matrix for mixing, and then calendering and gluing with a fabric impregnated with an adhesive, and vulcanizing to obtain a γ radiation protective fabric, which has a high shielding efficiency, but poor air permeability and is uncomfortable to wear, especially in a high temperature environment. Patent CN105513660B discloses a new type of radiation-proof gloves and a method for making the same, which achieves radiation protection by adding lanthanum trioxide, tungsten trioxide, aluminum fluoride and other components to natural rubber, and also has the problem of rare earth element mining pollution and hazards during use. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide an X-ray resistant fiber and its preparation method and application. The present invention aims to enhance the breathability and moisture permeability, fatigue resistance, easy care and other wearing properties of lead-free clothing on the basis of meeting the X-ray protection performance. The present invention has developed a stretchable fiber, which is coated on the basis of pre-stretching, and the coating contains radiation-proof particles I. The wrinkles generated after rebound can not only prevent the coating from breaking during stretching, but also the wrinkled layer can scatter and reflect X-rays multiple times, thereby enhancing the radiation protection effect.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A fiber for protecting against X-ray radiation comprises a fiber body and a wrinkled coating wrapped on the surface of the fiber body; the coating comprises the coating body and radiation-proof particles I dispersed therein.

[0008] The prior art has not disclosed a wrinkled coating containing radiation-proof particles. The prior art designs the coating into a wrinkled shape mainly to avoid the coating from breaking after the fiber is stretched and losing its original performance. The main purpose of designing the coating into a wrinkled shape in the present invention is to improve the radiation protection performance. The specific principle is: the wrinkled coating can make the X-rays be reflected or scattered multiple times under the action of the radiation-proof particles and weakened, so that the fiber has a higher X-ray shielding efficiency. When X-rays are irradiated on the surface of an object, two effects, absorption and scattering, will occur. The solid part will absorb part of the X-rays and at the same time cause the X-rays to be scattered on the solid surface, thereby causing the intensity of the X-rays to attenuate. When the radiation-proof particles I in the wrinkled coating of the present invention, such as bismuth oxide, are irradiated with X-rays, due to the high density and atomic number of the bismuth element, part of the X-rays will be consumed. On the other hand, the scattered X-rays on the wrinkled coating will irradiate the bismuth oxide again due to the rough and uneven surface, thereby greatly attenuating the intensity of the X-rays.

[0009] As the preferred technical solution:

[0010] In the X-ray resistant fiber as described above, the coating body has a thickness of 0.28-0.33 mm; the content of radiation-proof particles I in the coating body is 65-78 wt %, and the average particle size of the radiation-proof particles I is 100-200 nm.

[0011] The X-ray resistant fiber as described above further comprises radiation resistant particles II dispersed in the fiber body.

[0012] In the X-ray resistant fiber as described above, the diameter of the fiber body is 500 μm; the content of the radiation-proof particles II in the fiber body is 70 wt %, and the average particle size of the radiation-proof particles II is 50-80 nm.

[0013] In the X-ray resistant fiber as described above, the radiation resistant particles I and the radiation resistant particles II are independently selected from one or more of nano barium sulfate (BaSO4), bismuth trioxide (Bi2O3), lanthanum oxide (La2O3), gadolinium oxide (Gd2O3) and samarium oxide (Sm2O3).

[0014] In the X-ray protection fiber as described above, the radiation protection particle I is bismuth trioxide, and the radiation protection particle II is nano-barium sulfate. The multiple metal elements can not only make up for each other's weak absorption areas, but also cooperate to shield the X-rays. Because different metals have different absorption limits, they can shield X-ray particles of different energy levels. The absorption limit of bismuth is 90.52keV, and the absorption limit of barium is 37.41keV.

[0015] In the X-ray resistant fiber as described above, the materials of the fiber body and the coating body are both elastic polymers, so that the fiber has stretchable properties, and the wrinkled shape of the coating can ensure that the coating will not be broken due to the stretching of the fiber, and the performance of the X-ray resistant fiber is stable.

[0016] In the X-ray resistant fiber as described above, the elastic polymer is PU (polyurethane), TPV (thermoplastic vulcanized rubber) or TPEE (thermoplastic polyester elastomer).

[0017] The present invention also provides a method for preparing an X-ray resistant fiber as described above, firstly spinning a spinning solution containing a fiber body material, radiation resistant particles II and solvent a to obtain a composite fiber, then using an impregnation solution containing a coating body material, radiation resistant particles I and solvent b to impregnate and finish the composite fiber in a pre-stretched state, and after drying, removing the stretching force to obtain an X-ray resistant fiber.

[0018] As the preferred technical solution:

[0019] According to the method described above, in the spinning solution, the total concentration of the material of the fiber body and the radiation protection particles II is 10-15wt%; the spinning adopts a wet spinning process; the elongation of the composite fiber in the pre-stretched state is 300%-750%; in the impregnation solution, the total concentration of the material of the coating body and the radiation protection particles I is 50-60wt%.

[0020] According to the method described above, the preparation process of the spinning solution is as follows: a certain amount of solvent a is measured with a pipette and put into a reagent bottle, stirred in a magnetic stirrer for 2 to 4 hours, then radiation-proof particles II are added and mixed therewith, ultrasonicated for 10 to 50 minutes, and then the material of the fiber body is weighed and added thereto, and the temperature of the magnetic stirrer is adjusted to 50 to 60° C., and stirred for 24 to 48 hours to obtain the spinning solution;

[0021] The coagulation bath used in spinning is a mixed solution of water and ethanol, and the temperature of the coagulation bath is 0-50°C; after spinning, the composite fiber is also washed, dried, oiled, and cut;

[0022] The preparation process of the impregnation liquid is as follows: adding the coating body material and the radiation-proof particles I into the solvent b, stirring in a magnetic stirrer for 15 to 30 minutes, and obtaining the impregnation liquid;

[0023] The process of impregnation finishing is as follows: after adding the impregnation liquid into the homemade mold, the composite fiber in a pre-stretched state is placed into the homemade mold, impregnated for 5 to 20 minutes, taken out and dried in an oven for 5 to 10 minutes, and the impregnation-drying operation is repeated 3 times.

[0024] The present invention also provides an X-ray resistant elastic fabric having a composite layer structure, wherein the number of layers is greater than or equal to 2, at least one layer being a functional layer, and the functional layer being made of a fiber resistant to X-rays as described above; the elastic fabric may be a woven fabric, a knitted fabric or a braided fabric, etc. When the elastic fabric is a knitted fabric, a single-layer knitted fabric has a coil structure, so the single-layer knitted fabric will be light-transmissive or pass through X-rays, thereby weakening its shielding performance. However, the knitted fabric is designed to be a double-layer or even multi-layer fabric structure, and the upper and lower fabrics may cover each other, thereby ensuring the air permeability and elastic performance of the fabric and ensuring that it is not light-transmissive, and can reflect or shield X-rays from any direction.

[0025] As the preferred technical solution:

[0026] The X-ray resistant elastic fabric as described above has at least one layer as a wearing layer, and the wearing layer is made of various fibers or yarns with required wearing properties.

[0027] As described above, the X-ray resistant elastic fabric is a positive Poisson's ratio fabric. After being stretched in one direction, the yarns in the other direction will shrink inward, thereby increasing the X-ray shielding capability and compensating for the effect of the coating stretching and thinning.

[0028] The X-ray resistant elastic fabric as described above has a lead equivalent (in order to compare the shielding performance of various protective materials, lead is usually used as a reference. The thickness of the lead layer that achieves the same shielding effect as a certain shielding material of a certain thickness is called the lead equivalent of the shielding material. When lead is used as a reference substance, the attenuation equivalent is expressed by the thickness of the lead) of 0.33-0.45 mmPb, an X-ray shielding efficiency of more than 97%, an air permeability of 48-50 mm / s, a moisture regain of 1.2%-7.9%, and excellent moisture absorption performance.

[0029] Beneficial effects:

[0030] (1) The present invention obtains composite fibers containing radiation-proof particles such as barium salts by wet spinning. After the composite fibers are impregnated with bismuth oxide, salts or oxides such as barium and bismuth are not only non-toxic, but also have different absorption areas for X-rays, achieving a synergistic effect, compensating for their respective weak absorption areas, and absorbing X-rays in a wider range;

[0031] (2) The present invention obtains composite fibers by wet spinning, and then obtains elastic fabrics from the fibers by knitting, weaving and other weaving methods. In particular, for the coil structure of the knitted fabric, its porous structure can improve the air permeability of the fabric, and the wearing performance such as moisture absorption and perspiration can be achieved by selecting the inner layer structure of the multi-layer fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1This is a SEM image of the X-ray resistant fiber prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0034] In the following embodiments, the manufacturer of PU is Heyetang Plastics, and the brand is TPU-9380A; the manufacturer of TPV is Dihua Engineering Plastics, and the brand is TPV-50A; the manufacturer of TPEE is Dihua Engineering Plastics, and the brand is TPEE-50A.

[0035] The testing methods of the relevant performance indicators in the following embodiments are as follows:

[0036] Lead equivalent: The lead equivalent of the same protective material of the same thickness is not fixed. The lead equivalent of some protective materials varies with the X-ray peak tube voltage used. For lead-containing protective materials and supplies, the lead equivalent does not change much with the X-ray peak voltage used, but there is a "weak absorption zone" of lead for ionizing radiation with an X-ray peak tube voltage between 40.0 and 88.0 keV. For non-lead-containing protective materials and supplies, the lead equivalent varies greatly with the X-ray peak voltage used. For the test of the lead equivalent of X-ray protective clothing of the same protective material, its lead equivalent value should be tested under different tube voltages within a certain range. The test values ​​should be no less than 5, and the minimum value should be used to determine the lead equivalent level of the protective material.

[0037] X-ray shielding efficiency: The lead equivalent of the composite sample was tested in accordance with the provisions of GBZ / T 147-2002. The X-ray tube voltage was 130kV, the filter copper plate thickness was 0.25mm, and the X-ray shielding efficiency was calculated as follows:

[0038]

[0039] Where: η represents the shielding efficiency of X-rays (%); n0 is the dose rate when no sample is added; n d is the dose rate after adding the sample; n b is the background dose rate;

[0040] Air permeability: According to GB / T 5453-2997 "Determination of air permeability of textile fabrics", the air flow rate passing vertically through a given area of ​​a sample within a certain period of time is measured under specified pressure difference conditions, and the air permeability is calculated. The air flow rate can be measured directly or converted by measuring the pressure difference on both sides of the flow aperture;

[0041] Moisture regain: Moisture regain is the percentage of the difference between the wet weight and dry weight of the sample to the dry weight. The most common measurement method is the oven method. The oven method uses electric heating wires to heat. When the temperature in the oven rises to the specified value, the sample is placed in the oven to evaporate the moisture in the textile material into the air, and the humid air is discharged out of the oven using a ventilation device. As the moisture in the textile material continues to evaporate and dissipate, the mass continues to decrease. When the mass is dried to a constant, it is the dry weight of the textile material (all mass losses during the drying process are considered as moisture), and the moisture regain is calculated.

[0042] Example 1

[0043] A method for preparing X-ray resistant fiber, comprising the following steps:

[0044] (1) Preparation of raw materials:

[0045] Material of fiber body: PU;

[0046] Material of coating body: PU;

[0047] Radiation protection particles I: bismuth trioxide, average particle size is 100nm;

[0048] Radiation protection particles II: nano barium sulfate, average particle size is 80nm;

[0049] Solvent a: DMF;

[0050] Solvent b: deionized water;

[0051] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 10 wt %;

[0052] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 600%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 50wt%.

[0053] The resulting X-ray-proof fiber is Figure 1As shown, it consists of a fiber body, anti-radiation particles II dispersed in the fiber body, and a corrugated coating wrapped on the surface of the fiber body; the coating consists of a coating body and anti-radiation particles I dispersed therein; the diameter of the fiber body is 500μm; the content of anti-radiation particles II in the fiber body is 70wt%; the thickness of the coating body is 0.29mm; the content of anti-radiation particles I in the coating body is 72wt%.

[0054] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 2, one layer is a functional layer, the functional layer is a knitted fabric made of the above X-ray resistant fiber, and the square meter weight of the functional layer is 520g / m 2 The other layer is the clothing layer, which is a woven fabric made of cotton fiber, and the weight per square meter of the clothing layer is 180g / m 2 .

[0055] The lead equivalent of the X-ray-proof elastic fabric is 0.37 mmPb, the X-ray shielding efficiency is 98%, the air permeability is 48 mm / s, and the moisture regain is 1.2%.

[0056] Comparative Example 1

[0057] A method for preparing X-ray resistant fiber is basically the same as that of Example 1, except that when the composite fiber is impregnated in step (3), the composite fiber is not in a pre-stretched state but in a natural state.

[0058] An X-ray resistant elastic fabric is basically the same as Example 1, except that the raw material of the functional layer is the X-ray resistant fiber prepared in this comparative example.

[0059] The lead equivalent of the X-ray resistant elastic fabric is 0.22 mmPb, and the X-ray shielding efficiency is 93%. By comparing Example 1 with Comparative Example 1, it can be seen that the radiation protection performance of the X-ray resistant elastic fabric of Example 1 is significantly higher than that of Comparative Example 1. This is because when the composite fiber is impregnated in Comparative Example 1, the composite fiber is not in a pre-stretched state, resulting in the coating in the final X-ray resistant fiber not being in a wrinkled shape. By comparing Example 1 with Comparative Example 1, it can be seen that the present invention designs the coating into a wrinkled shape, which effectively improves the radiation protection performance of the fabric.

[0060] Example 2

[0061] A method for preparing X-ray resistant fiber is basically the same as that of Example 1, except that the radiation resistant particles I are nano-barium sulfate with an average particle size of 100 nm.

[0062] An X-ray resistant elastic fabric is basically the same as the first embodiment, except that the raw material of the functional layer is the X-ray resistant fiber prepared in this embodiment.

[0063] The lead equivalent of the elastic fabric for protecting against X-rays is 0.32 mmPb, and the shielding efficiency of X-rays is 97%. By comparing Example 1 with Example 2, it can be seen that the radiation protection performance of the elastic fabric for protecting against X-rays of Example 1 is significantly higher than that of Example 2. This is because the radiation protection particles I and the radiation protection particles II in Example 2 are both nano-barium sulfate, and the two cannot complement each other and cannot work together to shield X-rays.

[0064] Example 3

[0065] A method for preparing X-ray resistant fiber is basically the same as that in Example 1, except that the radiation resistant particles II are bismuth trioxide with an average particle size of 80 nm.

[0066] An X-ray resistant elastic fabric is basically the same as the first embodiment, except that the raw material of the functional layer is the X-ray resistant fiber prepared in this embodiment.

[0067] The lead equivalent of the elastic fabric for protecting against X-rays is 0.31 mmPb, and the shielding efficiency of X-rays is 97%. By comparing Example 1 with Example 3, it can be seen that the radiation protection performance of the elastic fabric for protecting against X-rays in Example 1 is significantly higher than that in Example 3. This is because the radiation protection particles I and the radiation protection particles II in Example 3 are both bismuth trioxide, and the two cannot complement each other and cannot work together to shield X-rays.

[0068] Example 4

[0069] A method for preparing X-ray resistant fiber, comprising the following steps:

[0070] (1) Preparation of raw materials:

[0071] Material of fiber body: PU;

[0072] Material of coating body: PU;

[0073] Radiation protection particles I: nano barium sulfate, average particle size is 150nm;

[0074] Radiation protection particles II: bismuth trioxide, average particle size 70nm;

[0075] Solvent a: DMF;

[0076] Solvent b: deionized water;

[0077] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 15 wt %;

[0078] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 750%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 60wt%.

[0079] The final X-ray protection fiber consists of a fiber body, radiation protection particles II dispersed in the fiber body, and a pleated coating wrapped on the surface of the fiber body; the coating consists of a coating body and radiation protection particles I dispersed therein; the diameter of the fiber body is 500 μm; the content of radiation protection particles II in the fiber body is 70 wt%; the thickness of the coating body is 0.31 mm; the content of radiation protection particles I in the coating body is 78 wt%.

[0080] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 2, one layer is a functional layer, the functional layer is a woven fabric made of the X-ray resistant fiber, and the square meter weight of the functional layer is 550g / m 2 The other layer is the clothing layer, which is a knitted fabric made of viscose fiber, and the weight per square meter of the clothing layer is 185g / m 2 .

[0081] The lead equivalent of the X-ray-proof elastic fabric is 0.45 mmPb, the X-ray shielding efficiency is 99%, the air permeability is 49 mm / s, and the moisture regain is 7.9%.

[0082] Comparative Example 2

[0083] A method for preparing X-ray resistant fiber is basically the same as that of Example 4, except that when the composite fiber is impregnated in step (3), the composite fiber is not in a pre-stretched state but in a natural state.

[0084] An X-ray resistant elastic fabric is basically the same as Example 4, except that the raw material of the functional layer is the X-ray resistant fiber prepared in this comparative example.

[0085] The lead equivalent of the X-ray resistant elastic fabric is 0.27 mmPb, and the X-ray shielding efficiency is 87%. By comparing Example 4 with Comparative Example 2, it can be seen that the radiation protection performance of the X-ray resistant elastic fabric of Example 4 is significantly higher than that of Comparative Example 2. This is because when the composite fiber is impregnated in Comparative Example 2, the composite fiber is not in a pre-stretched state, resulting in the coating in the final X-ray resistant fiber not being in a wrinkled shape. By comparing Example 4 with Comparative Example 2, it can be seen that the present invention designs the coating into a wrinkled shape, which effectively improves the radiation protection performance of the fabric.

[0086] Example 5

[0087] A method for preparing X-ray resistant fiber, comprising the following steps:

[0088] (1) Preparation of raw materials:

[0089] Material of fiber body: TPV;

[0090] Material of coating body: TPV;

[0091] Radiation protection particles I: lanthanum oxide, average particle size 200nm;

[0092] Radiation protection particles II: a mixture of nano-barium sulfate and bismuth trioxide in a mass ratio of 1:1, with an average particle size of 55nm;

[0093] Solvent a: ethylene dichloride;

[0094] Solvent b: deionized water;

[0095] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 10 wt %;

[0096] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 300%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 50wt%.

[0097] The final X-ray protection fiber consists of a fiber body, radiation protection particles II dispersed in the fiber body, and a pleated coating wrapped on the surface of the fiber body; the coating consists of a coating body and radiation protection particles I dispersed therein; the diameter of the fiber body is 500 μm; the content of radiation protection particles II in the fiber body is 70 wt%; the thickness of the coating body is 0.28 mm; the content of radiation protection particles I in the coating body is 65 wt%.

[0098] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 3, two layers are functional layers, the functional layers are knitted fabrics made of the above X-ray resistant fibers, and the square meter weight of each functional layer is 670g / m 2 The first layer is the clothing layer, which is a woven fabric made of polyester fiber. The weight per square meter of the clothing layer is 211g / m 2 ; Both functional layers are located above the clothing layer.

[0099] The lead equivalent of the X-ray-proof elastic fabric is 0.38 mmPb, the X-ray shielding efficiency is 97%, the air permeability is 49 mm / s, and the moisture regain is 5.1%.

[0100] Example 6

[0101] A method for preparing X-ray resistant fiber, comprising the following steps:

[0102] (1) Preparation of raw materials:

[0103] Material of fiber body: TPV;

[0104] Material of coating body: TPV;

[0105] Radiation protection particles I: gadolinium oxide, average particle size 120nm;

[0106] Radiation protection particles II: lanthanum oxide, average particle size 65nm;

[0107] Solvent a: ethylene dichloride;

[0108] Solvent b: deionized water;

[0109] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 15 wt %;

[0110] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 450%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 60wt%.

[0111] The final X-ray protection fiber consists of a fiber body, radiation protection particles II dispersed in the fiber body, and a pleated coating wrapped on the surface of the fiber body; the coating consists of a coating body and radiation protection particles I dispersed therein; the diameter of the fiber body is 500 μm; the content of radiation protection particles II in the fiber body is 70 wt%; the thickness of the coating body is 0.28 mm; the content of radiation protection particles I in the coating body is 67 wt%.

[0112] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 3, two layers are functional layers, the functional layers are woven fabrics made of the above X-ray resistant fibers, and the square meter grammage of each functional layer is 695g / m 2 The first layer is the clothing layer, which is a woven fabric made of polyamide fiber. The weight per square meter of the clothing layer is 233g / m 2 ; Both functional layers are located above the clothing layer.

[0113] The lead equivalent of the X-ray-proof elastic fabric is 0.42 mmPb, the X-ray shielding efficiency is 98%, the air permeability is 48 mm / s, and the moisture regain is 5.3%.

[0114] Example 7

[0115] A method for preparing X-ray resistant fiber, comprising the following steps:

[0116] (1) Preparation of raw materials:

[0117] Material of fiber body: TPEE;

[0118] Material of coating body: TPEE;

[0119] Radiation protection particles I: samarium oxide, average particle size 180nm;

[0120] Radiation protection particles II: gadolinium oxide, average particle size 50nm;

[0121] Solvent a: DMAC;

[0122] Solvent b: deionized water;

[0123] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 10 wt %;

[0124] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 700%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 50wt%.

[0125] The final X-ray protection fiber consists of a fiber body, radiation protection particles II dispersed in the fiber body, and a pleated coating wrapped on the surface of the fiber body; the coating consists of a coating body and radiation protection particles I dispersed therein; the diameter of the fiber body is 500μm; the content of radiation protection particles II in the fiber body is 70wt%; the thickness of the coating body is 0.32mm; the content of radiation protection particles I in the coating body is 69wt%.

[0126] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 4, two layers are functional layers, the functional layers are woven fabrics made of the above X-ray resistant fibers, and the square meter gram weight of each functional layer is 732g / m 2 The two layers are clothing layers, which are knitted fabrics made of wool fibers. The weight per square meter of each clothing layer is 362g / m 2 ; Two functional layers are adjacent to each other, two serving layers are adjacent to each other, and the functional layer is located above the serving layer.

[0127] The lead equivalent of the X-ray-proof elastic fabric is 0.39 mmPb, the X-ray shielding efficiency is 99%, the air permeability is 50 mm / s, and the moisture regain is 6.2%.

[0128] Example 8

[0129] A method for preparing X-ray resistant fiber, comprising the following steps:

[0130] (1) Preparation of raw materials:

[0131] Material of fiber body: TPEE;

[0132] Material of coating body: TPEE;

[0133] Radiation protection particles I: a mixture of nano-barium sulfate and bismuth trioxide in a mass ratio of 1:1, with an average particle size of 160nm;

[0134] Radiation protection particles II: samarium oxide, average particle size 60nm;

[0135] Solvent a: DMAC;

[0136] Solvent b: deionized water;

[0137] (2) spinning a spinning solution composed of the fiber body material, radiation protection particles II and solvent a by a wet spinning process to obtain a composite fiber; wherein the total concentration of the fiber body material and the radiation protection particles II in the spinning solution is 15 wt %;

[0138] (3) The composite fiber in a pre-stretched state is impregnated and finished with an impregnation liquid containing the coating body material, radiation-proof particles I and solvent b, and the stretching force is removed after drying to obtain X-ray-proof fibers; wherein the elongation of the composite fiber in the pre-stretched state is 750%, and the total concentration of the coating body material and the radiation-proof particles I in the impregnation liquid is 60wt%.

[0139] The final X-ray protection fiber consists of a fiber body, radiation protection particles II dispersed in the fiber body, and a pleated coating wrapped on the surface of the fiber body; the coating consists of a coating body and radiation protection particles I dispersed therein; the diameter of the fiber body is 500μm; the content of radiation protection particles II in the fiber body is 70wt%; the thickness of the coating body is 0.33mm; the content of radiation protection particles I in the coating body is 69wt%.

[0140] An X-ray resistant elastic fabric is a positive Poisson's ratio fabric with a composite layer structure, the number of layers is 4, two layers are functional layers, the functional layers are woven fabrics made of the above X-ray resistant fibers, and the square meter weight of each functional layer is 768g / m 2 The two layers are clothing layers, which are woven fabrics made of silk fibers. The weight per square meter of each clothing layer is 314g / m 2 ; Two functional layers are adjacent to each other, two serving layers are adjacent to each other, and the functional layer is located above the serving layer.

[0141] The lead equivalent of the X-ray-proof elastic fabric is 0.33 mmPb, the X-ray shielding efficiency is 99%, the air permeability is 49 mm / s, and the moisture regain is 6.5%.

Claims

1. An X-ray resistant elastic fabric, characterized in that: It has a composite layer structure, the number of layers is greater than or equal to 2, at least one layer is a functional layer, the functional layer is made of X-ray resistant fiber; at least one layer is a clothing layer, the clothing layer is made of various fibers or yarns with required clothing properties; The lead equivalent of the elastic fabric for X-ray protection is 0.33~0.45mmPb, the shielding efficiency of X-ray is over 97%, the air permeability is 48~50mm / s, and the moisture regain is 1.2%~7.9%; The preparation method of the X-ray resistant fiber is as follows: firstly, spinning a spinning solution containing a fiber body material, radiation-resistant particles II and solvent a to obtain a composite fiber, then impregnating and finishing the composite fiber in a pre-stretched state with an impregnation solution containing a coating body material, radiation-resistant particles I and solvent b, and removing the drafting force after drying to obtain the X-ray resistant fiber; The X-ray resistant fiber includes a fiber body and a wrinkled coating wrapped on the surface of the fiber body; the coating includes a coating body and radiation resistant particles I dispersed therein; The materials of the fiber body and the coating body are both elastic polymers; The thickness of the coating body is 0.28~0.33mm.

2. The X-ray resistant elastic fabric according to claim 1, characterized in that: The content of the radiation-proof particles I in the coating body is 65-78wt%, and the average particle size of the radiation-proof particles I is 100-200nm.

3. The X-ray resistant elastic fabric according to claim 1, characterized in that: The X-ray shielding fiber further comprises radiation shielding particles II dispersed in the fiber body.

4. The X-ray resistant elastic fabric according to claim 3, characterized in that: The diameter of the fiber body is 500 μm; the content of the radiation-proof particles II in the fiber body is 70 wt %, and the average particle size of the radiation-proof particles II is 50-80 nm.

5. The X-ray resistant elastic fabric according to claim 3, characterized in that: The radiation-proof particles I and the radiation-proof particles II are each independently selected from one or more of nano-barium sulfate, bismuth trioxide, lanthanum oxide, gadolinium oxide and samarium oxide.

6. The X-ray resistant elastic fabric according to claim 1, characterized in that: In the spinning solution, the total concentration of the fiber body material and the radiation protection particles II is 10~15wt%; the spinning adopts a wet spinning process; the elongation of the composite fiber in the pre-stretched state is 300%~750%; in the impregnation solution, the total concentration of the coating body material and the radiation protection particles I is 50~60wt%.

7. The X-ray resistant elastic fabric according to claim 1, characterized in that: X-ray-proof elastic fabrics are positive Poisson's ratio fabrics.

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