88 results about "Electron beam radiation" patented technology

The invention discloses a wear-resistant environment-friendly PET base material adhesive tape and a preparation method thereof, and belongs to the technical field of adhesive tapes, raw materials comprise a PET adhesive tape film and an EB curing modified adhesive, the surface of the modified PET adhesive tape film subjected to corona treatment is coated with the EB curing modified adhesive, then electron beam radiation curing is carried out, the absorbed dose of electron beams is 38-42 kGy, and the EB curing modified adhesive is prepared. And then cooling, rolling and curing to obtain the wear-resistant environment-friendly PET base material adhesive tape. The modified PET adhesive tape film is prepared from the following raw materials: PET resin and modified polyolefin elastomer master batch; the EB curing modified adhesive is prepared from the following raw materials: butyl acrylate, 2-ethylhexyl acrylate, tripropylene glycol diacrylate, acrylate resin, urethane acrylate and starch modified core-shell microsphere powder. According to the mode, a modification process is added in the preparation process of the PET adhesive tape film and the adhesive, and finally the environment-friendly PET base material adhesive tape with excellent comprehensive performance is prepared.

The invention discloses a bio-based TPV composite material and a preparation method thereof, and belongs to the technical field of preparation of TPV composite materials, polylactic acid is used as a plastic phase, bio-based itaconate rubber and a bio-based ethylene-vinyl acetate copolymer are used as a rubber phase, maleic anhydride grafted cardanol and an ethylene-acrylic acid copolymer are used as a composite compatibilizer, and the bio-based TPV composite material is prepared. Titanate coupling agent modified core-shell particles are added to serve as a reinforcing agent, dicumyl peroxide is combined with an electron beam radiation initiation mode, and the bio-based PLA / Bio-ItBR / EVA TPV is prepared through a dynamic vulcanization process. The product has medium hardness, medium tensile strength, excellent ductility and high elasticity, and good elastic memory ability and compressive deformation resistance. The compatibility between a plastic phase and a rubber phase is improved, and the phase separation problem caused by polarity difference is reduced. The dicumyl peroxide is combined with a dynamic vulcanization process initiated by electron beam radiation, so that a uniform cross-linked network can be formed, and the stability of the material performance is improved.

The present disclosure provides a process. In an embodiment, the process includes providing a neat ethylene / propy-lene / non-conjugated polyene terpolymer (n-terpolymer) having a Mooney viscosity (ML (1+4) at 125C) less than 100 Mooney units (MU). The process includes exposing the n-terpolymer to electron beam radiation at a dosage from 0.2 megaRad (MRad) to 1.3 MRad. The process includes forming a branched ethylene / propylene / non-conjugated polyene terpolymer (b-terpolymer) having a Mooney viscosity ML (1+4) at 125C from 25 MU to 135 MU.

The invention discloses a polypropylene grafted copolymer self-reinforced polypropylene cable insulation material and a preparation method thereof, and relates to the field of high polymer materials. The preparation method of the material comprises the following steps: firstly, preparing a polypropylene grafted copolymer by a melt grafting method or an electron beam radiation grafting method; carrying out melt blending on the master batch and polypropylene to prepare a primary master batch; and finally, carrying out melt blending on the primary master batch, polypropylene, an antioxidant, a voltage stabilizer and a processing aid to obtain the cable insulating material. The polypropylene grafted copolymer induces the matrix polypropylene to generate a beta crystal form, and the beta crystal form and the polar vinyl monomer jointly realize self-enhancement independent of an elastomer, so that the toughness, the heat resistance and the direct-current dielectric property of the material are synchronously improved, and the problem of performance reduction caused by blending of traditional elastomers is solved; the method is suitable for the high-voltage direct-current cable insulation field.

The invention discloses an antibacterial PET cup material and a preparation method thereof, and belongs to the technical field of antibacterial plastic cup materials, the antibacterial PET cup material comprises the following raw materials by weight: 85.6-92.7 parts of maleic anhydride grafted and electron beam radiation co-modified PET, 6.3-12.3 parts of a thermal activation type carbon-based nano antibacterial agent, 1.5-2.3 parts of a dispersant, and 0.5-1.3 parts of an antioxidant; the maleic anhydride grafted and electron beam radiation co-modified PET is obtained by grafting and modifying PET with maleic anhydride and then performing electron beam radiation modification treatment; the preparation method of the thermal activation type carbon-based nano antibacterial agent comprises the following steps: synthesizing carbon dots from APTES and citric acid through a hydrothermal method, carrying out charge regulation on the carbon dots, compounding the carbon dots with chitosan, and carrying out thermal activation treatment to prepare the thermal activation type carbon-based nano antibacterial agent. The antibacterial PET material prepared by the invention has a good antibacterial effect and relatively durable and stable antibacterial performance, and meanwhile, is high in tensile strength, and is beneficial to improving the durability of a water cup.

The utility model discloses a shielding device for electron beam radiation chamber protection, which comprises side baffle plates and a top plate which are arranged in a radiation chamber, the side baffle plates and the top plate are detachably connected, the bottom ends of the side baffle plates are provided with assembling plates, a conveying mechanism is arranged between adjacent side baffle plates, and a fixing plate positioned above the conveying mechanism is arranged between the side baffle plates. A movable baffle connected with the linear reciprocating motion mechanism is arranged in the fixing plate, a distance detection assembly facing the conveying mechanism is arranged on the top plate, a bearing plate connected with the side baffles is arranged below the conveying mechanism, a supporting plate is connected to the top of the bearing plate, and a shielding piece is connected to the supporting plate. According to the X-ray shielding device, through the arrangement of the conveying mechanism, the distance detection assembly, the bearing plate, the supporting plate, the fixed plate and the movable baffle, the X-ray diffusion path is effectively reduced, the X-ray shielding performance is improved, and the X-ray shielding device can adapt to conveying mechanisms of various different heights at the same time.

The present disclosure relates to a membrane with significantly increased selectivity for use in hemodialysis applications, wherein the membrane is coated with chondroitin. The membrane can be obtained by contacting a base membrane, which for example comprises a blend of i) a polysulfone, polyethersulfone or polyarylethersulfone and ii) polyvinylpyrrolidone, to a solution of chondroitin followed by e-beam radiation. The disclosure further relates to a process for producing the selective hemodialysis membrane, and to a method of increasing the selectivity of a membrane. The disclosure further relates to a filtration / diffusion device comprising such membrane.

The invention provides a preparation method and application of MOFs (Metal-Organic Frameworks) functionalized magnetic hydrothermal sawdust carbon, and belongs to the technical field of environmental functional materials. The preparation method comprises the following steps: dissolving sawdust carbon by using ethylene glycol, so that FeCl3. 6H2O and CH3COONa in the sawdust carbon are subjected to hydrothermal carbonization at high temperature and high pressure to generate a hydrothermal carbon matrix and form a uniformly dispersed magnetic hydrothermal carbon composite material; grafting a functional carboxylic acid monomer on the surface of the magnetic hydrothermal sawdust carbon material by virtue of an electron beam radiation grafting technology; and adsorbing and fixing a metal center by using the magnetic hydrothermal sawdust carbon grafted with the functional carboxylic acid monomer, and growing ZIFs in situ by taking dimethylimidazole as a ligand to prepare the magnetic recoverable adsorption material ZIFs (at) MPS-HC with better antibiotic adsorption performance. As a composite material with relatively high adsorption efficiency and adsorption capacity, the composite material can be applied to the field of adsorption and recovery of antibiotic wastewater pollutants.

A process for coating a substrate with a coating having a gloss value at an angle of 60° of at most 40 gloss units, comprising applying a layer of liquid, solvent-free, radiation-curable coating composition at a dry film thickness and curing by electron-beam radiation, the coating composition comprising a radiation-curable resin system, a first matting agent, and optionally a second matting agent in a weight ratio of first to second matting agent of at least 1.0 and a combined amount of first and second matting agents of 8-25 wt.%, based on the weight of the radiation-curable resin system, wherein the first matting agent consists of spherical particles of non-reactive polymer with an average particle size Dv50 of 1.15-1.90 times the dry film thickness, wherein the second matting agent consists of particles with an average particle size Dv50 smaller than the dry film thickness.

This invention discloses a self-reinforced polypropylene cable insulation material and its preparation method using a polypropylene graft copolymer, relating to the field of polymer materials. The preparation method includes: firstly, preparing a polypropylene graft copolymer via melt grafting or electron beam radiation grafting; subsequently, melt-blending the copolymer with polypropylene to prepare a primary masterbatch; and finally, melt-blending the primary masterbatch with polypropylene, an antioxidant, a voltage stabilizer, and processing aids to obtain the cable insulation material. This invention induces the matrix polypropylene to produce a β-crystal form through the polypropylene graft copolymer. The β-crystal form and polar vinyl monomers together achieve elastomer-independent self-reinforcement, simultaneously improving the material's toughness, heat resistance, and DC dielectric properties. This solves the performance degradation problem caused by traditional elastomer blending and is suitable for high-voltage DC cable insulation.

An electron microscope includes an electron optical system that irradiates a sample with an electron beam to form an image with electrons transmitted through the sample, a camera that includes an image sensor having sensor pixels and captures frame images that are based on output values output from each of the sensor pixels by incidence of the electrons on the image sensor, and a correction coefficient calculation unit that calculates correction coefficients for correcting sensitivities of the sensor pixels. The correction coefficient calculation unit determines, from the frame images captured under a condition under which the electrons incident on the image sensor follow a Poisson process, a mode value of the output values for each of the sensor pixels, and calculates the correction coefficients based on the mode value determined for each of the sensor pixels.

The invention relates to the technical field of chemical textile processing, and discloses a polylactic acid / nanocellulose composite fiber dyeing process, which comprises a spinning solution preparation process, a spinning process and a dyeing process, and the spinning solution preparation process comprises the following steps: uniformly mixing a nanocellulose suspension, a polylactic acid solution and an additive, standing at 30-80 DEG C for 1-2 hours, performing high-energy electron beam radiation to form gel, and washing the gel to obtain a hydrogel spinning solution; in the spinning process, the hydrogel spinning solution is fed into wet spinning equipment for spinning to form fibers, the fibers are subjected to high-energy electron beam radiation drying reinforcement to obtain fiber filaments, the irradiation dose is 10-50 kGy, and the irradiation time is 3-5 minutes. The preparation method disclosed by the invention is simple, feasible, green and environment-friendly, the dye uptake of the prepared composite fiber reaches 80%, the strength of the composite fiber is enhanced by 1-2 times, and the fibrillation resistance is improved by 1-2 times.

The invention discloses a low-carbon alkane dehydrogenation catalyst as well as a preparation method and application thereof, and belongs to the technical field of low-carbon alkane dehydrogenation catalysis. ZMQ-1 molecular sieve dispersion liquid is prepared from a ZMQ-1 molecular sieve and an EDTA (Ethylene Diamine Tetraacetic Acid) solution; carrying out electron beam radiation treatment on the ZMQ-1 molecular sieve dispersion liquid; adding a lanthanum compound and a rhodium compound to obtain a mixed solution; and carrying out electron beam radiation treatment on the mixed solution, and carrying out ball dropping forming, drying and roasting to obtain the low-carbon alkane dehydrogenation catalyst. Through the mode, the light alkane dehydrogenation catalyst is obtained by performing electron beam radiation treatment on the ZMQ-1 molecular sieve dispersion liquid, adding lanthanum and rhodium elements according to a reasonable proportion, performing electron beam radiation treatment on the mixed liquid, and performing ball dropping forming, drying and roasting. On the other hand, the whole preparation process is less than 10 hours, the production cycle of the catalyst is shortened, and the energy consumption of the preparation process is reduced.

[Problem] To provide an electron beam radiation device and an electron beam radiation method where a constant distance can be maintained between an emission surface of an electron beam radiation part and an object to be irradiated when radiating an electron beam onto a coating layer applied onto the object to be irradiated, and the occurrence of curing unevenness in the coating layer applied onto the object to be irradiated can thereby be prevented. [Solution] An electron beam radiation device 10 comprises: an electron beam radiation part 110 having an emission surface 111 for emitting an electron beam; an inert gas supply part 120 having a spray port for spraying an inert gas; a chamber section 130 for housing the emission surface and the spray port; a partitioning part 140 positioned in the chamber section and facing the emission surface; and a conveyance mechanism 150 configured such that a part of the object to be irradiated can be disposed in relation to a space 130a positioned between the emission surface and the partitioning part. The spray port is positioned on the emission surface side in the chamber section and is inclined from the emission surface side toward the partitioning part side, and in a state in which part of the object to be irradiated is disposed in the space positioned between the emission surface and the partitioning screen, the inert gas supply part is configured to spray the inert gas through the spray port to a position, on the partitioning part, facing the emission surface.

This invention discloses a shielding processing device and method for electron beam curing of workpieces, comprising a shell, a driving device, a moving shielding assembly, a gas filling device, and an electron beam radiation device. The shell has a first cavity and is provided with an inlet and an outlet communicating with the first cavity. The shell is also movably provided with an inlet gate and an outlet gate. The driving device is located in the shell. The moving shielding assembly includes a turntable and at least two gas baffles. The upper end of the turntable is divided into at least two conveying stations by the gas baffles. Each conveying station can independently connect to the outlet or the inlet as the turntable rotates. The gas filling device is located in the shell and is used to fill the conveying stations with protective gas. The electron beam radiation device is located in the shell and is used to output an electron beam to the conveying station that has been filled with protective gas. The above structure is compact and occupies little space. The gas baffles can not only prevent the protective gas from escaping, saving protective gas, but also prevent radiation leakage.

A method of reducing the titer of a biological contaminant in a biological product generally includes subjecting the biological product to electromagnetic energy having an ultraviolet (UV) wavelength or shorter in a dose effective to reduce biological contaminants in a sample of the biological product while maintaining integrity and function of the biological product. In one or more embodiments, the electromagnetic energy comprises UV-B, UV-C, X-rays, or γ-rays. In one or more embodiments, the method further includes subjecting the biological product to electron beam radiation.

An electron beam monitoring device monitors an electron beam in an electron beam irradiation system having an electron beam irradiation device configured to irradiate an irradiation target object with the electron beam via an emission window. The electron beam monitoring device includes a first X-ray detection unit and a second X-ray detection unit. The first X-ray detection unit has a detection surface directed toward between the emission window and the irradiation target object and detects an X-ray. The second X-ray detection unit is arranged to face the emission window and detects a one-dimensional or two-dimensional distribution of the X-ray.

An electron beam irradiation device is provided, which has a simplified vacuum chamber structure. An electron beam irradiation device (1) comprises: a cylindrical vacuum chamber (10) which accommodates an electrode assembly (14) for generating an electron beam; and a vacuum pump (20) which evacuates the interior of the vacuum chamber (10). An air inlet port (22) of the vacuum pump (20) is connected to an evacuation port (13) of the vacuum chamber (10).

The invention relates to the technical field of production of medical-grade polyvinyl chloride particles, in particular to a processing technology of special medical-grade polyvinyl chloride particles for gamma-resistant sterilization, which comprises the following steps: step S1, selecting raw materials; s2, raw material pretreatment: mixing the raw materials according to a set proportion, and premixing for 10-15 minutes through a high-speed mixer at a mixing rotating speed of 800-1200 rpm; s3, melt blending extrusion: adopting a single-screw extruder, and realizing extrusion by optimizing a screw structure and controlling temperature; step S4, pelletizing and collecting; and S5, sterilization treatment: carrying out ultraviolet sterilization, hydrogen peroxide steam sterilization and high-frequency pulse electron beam radiation sterilization treatment by adopting special sterilization equipment. In the actual use process, effective sterilization treatment of PVC particles is achieved from multiple angles, the phenomenon of thermal deformation of the PVC particles caused by a traditional sterilization mode is avoided in the sterilization treatment process, effective and uniform treatment is ensured in the sterilization treatment process, and the product quality is ensured.

The invention discloses a hydrogel-based super-tensile flexible multifunctional input device and preparation and application thereof. The conductive hydrogel is synthesized based on a double-crosslinking synthesis strategy of a hydrophilic polymer chain through a hydrophobic crosslinking node and a liquid metal electrostatic crosslinking node by adopting a gamma ray or electron beam radiation initiated polymerization crosslinking method, and is successfully applied to a flexible multifunctional input device. The device has ultrahigh tensile property and self-healing property, can bear large-amplitude cyclic stretching, can realize self-healing after being damaged for multiple times, and can normally work under a certain stretching amplitude and after self-healing. The device can realize two functions of a touch screen and a sensor, can realize function conversion, has the advantages of multiple functions, high sensitivity and good durability, and has a wide application prospect in stretchable flexible electronic equipment.

The invention belongs to the field of high polymer materials, and particularly relates to a battery pack buffering fireproof material and a preparation method thereof. The fireproof material is prepared from the following components in parts by mass: 50 to 70 parts of EVA (Ethylene-Vinyl Acetate), 10 to 20 parts of EPDM (Ethylene-Propylene-Diene Monomer), 5 to 15 parts of SBS (Styrene Butadiene Styrene), 15 to 25 parts of intumescent flame retardant, 2.5 to 5 parts of silane modified boehmite, 1.5 to 2.5 parts of smoke suppressant, 3 to 8 parts of compatilizer, 0.8 to 1.2 parts of cross-linking agent, 4 to 6 parts of foaming agent, 0.5 to 1 part of activating agent and 0.5 to 1 part of nucleating agent. Silane modified boehmite is decomposed at high temperature and reacts with polyphosphoric acid decomposed by APP to generate a ceramic layer, the carbon yield can be increased, EVA main chain crosslinking can be completed at normal temperature through electron beam radiation, and after a pre-crosslinking framework is formed, a crosslinking agent is crosslinked with an EPDM / SBS chain segment, and a rubber phase elastic network can be reinforced.

The invention provides a production process of nylon washing cloth, which comprises the following specific steps: (1) pre-shrinking a gray fabric, soaking the gray fabric in a pretreatment solution, and carrying out microwave treatment to obtain a treated gray fabric; the pretreatment liquid is prepared from the following raw materials in parts by weight: 5 to 7 parts of organic silicon modified polyurethane, 3 to 5 parts of citric acid, 1 to 3 parts of isocyanate ethyl acrylate and 50 to 70 parts of water; (2) performing electron beam radiation irradiation, water washing and pre-shaping treatment on the treated gray fabric to obtain pre-shaped gray fabric; and (3) wetting the pre-shaped gray cloth, adding a dye and a dye auxiliary agent, setting a program, carrying out overflow dyeing, dehydrating and spreading the cloth, and carrying out shaping treatment, cloth connection, gluing and finished product packaging. The obtained nylon water washing cloth is hydrophilic, soft, washable, high in color fastness and good in application prospect.

The present invention discloses a bio-based TPV composite material and a preparation method thereof, belonging to the technical field of TPV composite material preparation. The invention uses polylactic acid as the plastic phase, bio-based itaconate rubber and bio-based ethylene-vinyl acetate copolymer as the rubber phase, maleic anhydride grafted cardanol and ethylene-acrylic acid copolymer as a composite compatibilizer, and titanate coupling agent-modified core-shell particles as a reinforcing agent. The bio-based PLA / Bio-ItBR / EVA TPV is prepared by a dynamic vulcanization process using dicumyl peroxide combined with electron beam radiation initiation. The product has medium hardness, medium to high tensile strength, excellent ductility and high elasticity, good elastic memory and resistance to compression deformation. The present invention improves the compatibility between the plastic phase and the rubber phase, reducing the phase separation problem caused by polarity differences. The dynamic vulcanization process using dicumyl peroxide combined with electron beam radiation initiation can form a uniform cross-linked network and improve the stability of material properties.

PURPOSE: To provide a multi-beam image generating device and a multi-beam image generating method, which generates multiple primary electron beams, irradiates a sample with these while moving the sample, detects the multiple electron beams emitted at this time, and combines them into a single image, thereby quickly acquiring images.CONSTITUTION: A system includes a multiple beam generating device, means for irradiating a sample with multiple primary electron beams, means for detecting electrons emitted or reflected from the sample and outputting multiple electron beam images, a stage for acquiring images by repeatedly moving and stopping the sample, and an interferometer for measuring in real time the position of the stage in the direction of movement and the position perpendicular to the direction, and is configured to combine image information of the multiple output electron beams into a single image on the basis of position information obtained by a laser interferometer of a common image that overlaps between the image information.SELECTED DRAWING: Figure 1

The application belongs to the field of electrical performance detection, and particularly discloses a kind of in-situ measurement method and system for electrical performance defects of memory device, which comprises: modulated electron beam radiation is radiated on the target position of the surface of the device to be measured, the number of electrons radiated to the target position is in sinusoidal function relationship with time, the SEs signal of the target position is collected, the actual potential signal of the target position is collected, the proportional coefficient between the SEs signal and the actual potential signal is determined, the target position of the device to be measured is equivalent to a circuit in which resistance and capacitance are connected in parallel, and the resistance R and capacitance C of the target position are calculated according to the proportional coefficient SEs signal and the current signal of the modulated electron beam; according to the abnormal values in the resistance R and capacitance C of multiple target positions, the position of the electrical performance defects of the device is determined. The application can improve the defect contrast, better extract defect information, and meet the in-situ measurement of electrical performance of memory device.

The invention relates to the field of biological medicine, in particular to a preparation method and application of alpha-tocopheryl acetate-sodium hyaluronate nanoparticles. The preparation method comprises the following steps: firstly, shearing and emulsifying an alpha-tocopheryl acetate acetone solution and a sodium hyaluronate solution to obtain a uniformly dispersed solution, and then breaking part of chemical bonds on a sodium hyaluronate sugar chain and generating a large number of macromolecular free radicals under the premise of avoiding excessive degradation of sodium hyaluronate under the radiation action of a low-dose electron beam. The sodium hyaluronate free radicals have high reaction activity and form covalent bonds with tocopheryl acetate molecules. According to the invention, tocopheryl acetate is selected as a grafting modification material of sodium hyaluronate, and meanwhile, active ingredients such as beta-sitosterol and the like are wrapped, so that the tocopheryl acetate can be used as a main ingredient in the scalp filler, and a new idea is provided for treating androgenetic alopecia.

The present invention discloses a high-toughness non-woven fabric for homogeneous bags and a preparation method thereof, relating to the field of new materials technology. The high-toughness non-woven fabric for homogeneous bags produced in the present invention is produced by post-finishing a hydrophilic polyethylene non-woven fabric with a finishing agent. The hydrophilic polyethylene non-woven fabric is produced by first grafting glycidyl methacrylate onto the surface of the polyethylene non-woven fabric by electron beam radiation and then reacting with hydrophilic polylactic acid, thereby enhancing the hydrophilicity of the polyethylene non-woven fabric. The modified polyether ester is produced by reacting a modified phenolic resin with 2,5-furandicarboxylic acid and then with tributyl citrate. The modified phenolic resin is produced by reacting a phenolic resin with o-toluidine, thereby enhancing the toughness of the non-woven fabric.

The invention discloses a preparation method of an electron beam radiation cured optical function polyurethane resin type conformal coating. The preparation method specifically comprises the following steps: step 1, synthesizing a 2-hydroxy-4-methoxybenzophenone functional monomer; step 2, synthesizing a Cr2B2MBene functional monomer; step 3, synthesizing polyurethane resin; and 4, preparing the polyurethane resin type conformal coating according to products obtained in the steps 1-3. The invention further discloses the light function polyurethane resin type conformal coating cured through electron beam radiation and a curing method of the light function polyurethane resin type conformal coating cured through electron beam radiation, and the prepared conformal coating can achieve efficient shielding of ultraviolet rays and efficient transmittance of visible light.

The invention relates to radiation-treated reinforcement fibers, reinforced asphalt and portland cement concrete, and grout, methods for producing the same and application for their use. The radiation treatment includes exposing reinforcement fibers to electromagnetic energy, e.g., gamma rays, and / or electron-beam (E-beam) radiation. As a result of the treatment, the radiation-treated reinforcement fibers have a modified or deformed surface, e.g., an abraded and / or porous surface, as compared to reinforcement fibers without a radiation treatment.