109results about How to "Small mechanical properties" patented technology

The invention belongs to the field of novel composite materials, and particularly relates to a strong-ablation-erosion-resistant ceramizable flexible thermal protection material and a preparation method thereof.According to the material, ethylene propylene diene monomer serves as a matrix, polysilazane resin of a special structure serves as a ceramization modifier, and aerogel powder serves as heat insulation reinforcing filler. The thermal protection material provided by the invention can form a compact high-strength ceramic protection layer on the surface in a high-temperature environment, improves the structural strength of an ablation carbonization layer, effectively reduces the ablation degree of the material, has the characteristics of light weight, ablation resistance, scouring resistance, efficient heat insulation and the like, and can meet the protection requirements of high-performance engines of novel weaponry in the future.

The invention discloses a phase change fiber membrane with a composite core-sheath structure and a preparation method and application thereof.The method comprises the steps that polyacrylonitrile is dissolved in N 'N-dimethylformamide and stirred to be completely dissolved, then hydroxylated boron nitride is added, the hydroxylated boron nitride is evenly dispersed through ultrasonic treatment, and a sheath spinning precursor solution is prepared; dissolving polyethylene glycol in N 'N-dimethylformamide, stirring to melt the polyethylene glycol, and taking the polyethylene glycol as a core layer spinning precursor solution; preparing a phase change fiber membrane with a core-sheath structure from the sheath spinning precursor solution and the core spinning precursor solution through a coaxial electrostatic spinning process; and placing the phase change fiber membrane with the core-sheath structure in an ethanol dispersion liquid of hydroxylated boron nitride, carrying out ultrasonic dip-coating, and then carrying out cold pressing treatment to prepare the phase change fiber membrane with the composite core-sheath structure. The obtained composite core-sheath structure phase change fiber membrane has good latent heat property, thermal conductivity and flexibility, and meanwhile, leakage of the phase change material is prevented through the core-sheath structure.

The invention relates to the technical field of metal surface treatment, in particular to a method for achieving titanium metal surface rapid boronizing through electric field induction nanometer assembly in molten salt, titanium dioxide powder, boron powder, inorganic salt and a nanometer particle wrapping agent are evenly mixed, and the molten salt containing nanometer TiB2 is obtained after heating reaction. Graphite and a titanium metal part are put into molten salt containing nano TiB2, the graphite serves as a positive electrode, the titanium metal part serves as a negative electrode, the surface area ratio of the positive electrode to the negative electrode is (3-10): 1, the nano TiB2 in the molten salt is assembled on the surface of the titanium metal part under the action of an electric field to form a boronizing layer, and the boronizing speed is 60-500 microns / h. Compared with an existing high-temperature boronizing technology with active boron atoms as a constituent unit, the high-temperature boronizing technology has the advantages that the boronizing speed can be remarkably increased, the high-temperature boronizing treatment time of titanium metal is shortened, energy is saved, cost is reduced, and meanwhile the negative influence of the high-temperature environment on the organization structure and the mechanical property of a titanium metal part is eliminated.

The invention relates to ultrahigh-strength ultrahigh-toughness concrete and a preparation method thereof, and the process of the preparation method is as follows: designing the mix proportion of concrete slurry based on a close packing theory, and selecting a slurry formula with the fluidity of not less than 180mm and the initial strength of not less than 60MPa as a reference mix proportion; steel fibers are selected as end hook type steel fibers, a wood plate or a steel plate is used for formwork supporting according to the size requirement of the test piece, then a steel fiber cage is laid with the end hook type steel fibers within the supporting range, and the steel fibers are staggered with one another to form a macroscopic steel fiber space framework within the supporting range; preparing slurry according to a standard mixing ratio, then infiltrating the slurry into the built steel fiber space framework, and vibrating after the steel fiber space framework is completely infiltrated with the slurry; and then curing and form removal are performed to obtain the ultrahigh-strength ultrahigh-toughness concrete. The problem of agglomeration effect caused by too high fiber mixing amount is solved, and the unified requirements on the strength and toughness of concrete materials in engineering are met.

The invention relates to the technical field of regenerated polyethylene materials, and particularly discloses a high-flame-retardant regenerated polyethylene plastic and a preparation process thereof. Comprising the following steps: S1, taking maleic anhydride polyamidoamine, adding water and ethanol, uniformly stirring, adding 1-octene, a vinyl silane coupling agent and benzoyl peroxide, stirring for reaction, and removing a solvent to obtain a modifier; s2, adding carbon black into water and ethanol, uniformly stirring, heating, adding a modifier, and performing reflux reaction to obtain modified carbon black; s3, adding double-bond phosphate and sulfydryl modified benzene diboron into tetrahydrofuran, uniformly stirring, adding high-density polyethylene and a photoinitiator, mixing, carrying out ultraviolet irradiation, filtering, taking a solid, and drying, so as to obtain modified polyethylene; s4, taking regenerated high-density polyethylene, polypropylene, modified polyethylene, calcium stearate, modified carbon black, an antioxidant, a diisocyanate cross-linking agent, dicumyl peroxide and toner, uniformly stirring, and performing melt extrusion to obtain the high-flame-retardant regenerated polyethylene plastic.

The invention provides a preparation method of coaxial aerogel fiber and temperature self-adaptive protective aerogel fabric, which comprises the following steps: weighing nano-crystalline cellulose powder and dispersing in deionized water to obtain nano-crystalline cellulose dispersion suspension, weighing phase change microcapsules and dispersing in the nano-crystalline cellulose dispersion suspension to obtain phase change microcapsules; a core layer spinning mixed solution is obtained; carrying out wet spinning on the nano aramid fiber spinning stock solution and the core layer spinning mixed solution through a coaxial spinning needle, and fully solidifying in a coagulating bath to obtain coaxial gel fibers; the coaxial gel fibers are subjected to multiple times of solvent replacement treatment, then washed to be neutral and finally subjected to freeze drying treatment, and the coaxial aerogel fibers are obtained. According to the fabric, the phase change microcapsules are perfectly wrapped in the aerogel fibers, and the fabric has good heat insulation performance, good mechanical performance, excellent low-temperature and high-temperature responsiveness and a good protection effect in an extreme environment.

The present invention discloses a method and application of preparing a freshness indicator label by electrostatic spinning, which is obtained by the following steps: S1: adding bayberry anthocyanin to a matrix solution to obtain a spinning solution; S2: after ultrasonic filtration of the matrix solution, taking part of the solution and putting it into a 10ml syringe, fixing it on a propulsion pump, spinning using a high-voltage electrostatic spinning device under a specific voltage, receiving distance, flow rate, temperature and humidity to prepare a nanofiber membrane; S3: balancing the prepared nanofiber membrane for 48 hours, and cutting it into a specific size to prepare a freshness indicator label. The freshness indicator label prepared by the method of the present invention has a large specific surface area and porosity, and is sensitive to pH response. The bayberry anthocyanin freshness indicator label based on pullulan / polyvinyl alcohol has great application potential in the freshness monitoring and intelligent packaging of white shrimp.

The invention relates to the technical field of flame-retardant materials, in particular to a vanillin-derived nitrogen-phosphorus synergistic flame retardant as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out aldehyde-amine condensation reaction on vanillin and p-phenylenediamine to generate a Schiff base intermediate with a characteristic group-C = N-; and carrying out addition reaction on the intermediate and reactive hydrogen connected with a phosphorus atom on 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the vanillin-derived nitrogen-phosphorus synergistic flame retardant. The flame retardant obviously improves the flame retardant grade of the high polymer material under the condition of lower addition amount, does not release toxic and harmful gases in the combustion process, and meets the requirements of greenness and environmental protection. The flame retardant has good compatibility with high polymer materials such as thermoplastic polyurethane and the like. The preparation method of the flame retardant is controllable in reaction process, large-scale production is easy to realize, an innovative and feasible solution is provided for flame retardance of high polymer materials, and the flame retardant is expected to be widely applied to the fields of electronics, automobiles, buildings and the like.

The invention relates to the technical field of chemical fibers, and discloses a low-thermal-conductivity anti-ultraviolet fiber, a preparation method and application of the low-thermal-conductivity anti-ultraviolet fiber to a light-shading and heat-shielding fabric. The preparation method of the low-thermal-conductivity anti-ultraviolet fiber comprises the following steps: carrying out surface modification and functionalization treatment on a porous zinc oxide nanosheet to obtain a functionalized zinc oxide nanosheet; performing in-situ growth of cobalt borate on the surface of the functionalized zinc oxide nanosheet to obtain a composite nanomaterial; polyacrylonitrile, N, N-dimethylformamide and the composite nanomaterial are mixed, and a skin layer spinning solution is obtained; mixing the modified cellulose-based aerogel powder and N, N-dimethylformamide to obtain a core layer spinning solution; spinning the skin layer spinning solution and the core layer spinning solution to obtain polyacrylonitrile / aerogel composite fibers; the polyacrylonitrile / aerogel composite fiber is modified by diethylenetriamine, and an intermediate product is grafted to obtain the low-thermal-conductivity anti-ultraviolet fiber. The low-thermal-conductivity anti-ultraviolet fiber disclosed by the invention is low in thermal conductivity, good in anti-ultraviolet and flame-retardant effects and excellent in mechanical property.

The invention relates to a polycarbonate composition and a preparation method thereof, and the polycarbonate composition mainly comprises the following components in parts by weight: 65-85 parts of aromatic polycarbonate, 15-35 parts of phosphorus-silicon copolycarbonate, 0.05-1 part of an antioxidant and 0.1-1 part of a lubricant. According to the polycarbonate composition prepared by the invention, the double-screw extruder is adopted for blending, the compatibility of the phosphorus-silicon copolycarbonate and the aromatic polycarbonate is good, the flame retardant property of the polycarbonate composite material is greatly improved through the phosphorus-silicon synergistic flame retardant effect, and the use of a halogen-free flame retardant is avoided; the reduction of the mechanical property of the polycarbonate material caused by the small-molecule flame retardant is improved, and the low-temperature impact resistance of the material is greatly improved by the siloxane chain segment.

The invention discloses an alloy wear-resistant sliding block and a preparation and production process, and belongs to the technical field of alloy sliding blocks. A position hole is formed in an upper base body, and position grooves are formed in the periphery of the position hole. The included angle between the position holes and the vertical axis is 17-35 degrees, an L-shaped pressing block is installed on the outer side of the arc-shaped body, and a curve part and a bevel part are arranged in the side direction of the L-shaped pressing block; the end parts of the curve parts are welded on the longitudinal water beam; and an anti-bending strip is arranged in the multiple groups of curve parts and is welded with the L-shaped pressing block. The alloy comprises the following components in parts by weight: 2 to 3 parts of C, 10 to 15 parts of Fe, 3 to 5 parts of S , 2 to 3 parts of Al, 15 to 19 parts of Cr, 3 to 5 parts of T , 0.3 to 1.5 parts of Nb, 6 to 9 parts of Co, 0.1 to 0.2 part of P and the balance of N and trace residual impurities, wherein REC is set to be equal to (A < l > + S + T + Cr) / 3N + (Nb + T ) / 2 (N + Cr), and REC is larger than or equal to 0.16 and smaller than or equal to 0.31. The technical problems that longitudinal expansive force is generated in the heat-resistant sliding block due to heating, cracks are generated on the surface of the longitudinal water beam under the action of tensile force, and then breakage is caused are solved.

The invention provides 3D printing silicone rubber ink containing high-dispersion and high-reinforcement white carbon black as well as a preparation method and application of the 3D printing silicone rubber ink. The 3D printing silicone rubber ink provided by the invention comprises the high-dispersion high-reinforcement white carbon black and the low-thickening white carbon black, and the combined use of the high-dispersion high-reinforcement white carbon black and the low-thickening white carbon black can enable the 3D printing silicone rubber ink to have thixotropy and self-supporting capability at the same time, and have the characteristic of being compatible with high-function filler; by applying the 3D printing silicone rubber ink, 3D printing silicone rubber with excellent mechanical properties can be obtained. The preparation method of the 3D printing silicone rubber ink is simple, the preparation cost is low, the mechanical property of the obtained 3D printing silicone rubber is excellent, mass production preparation of the 3D printing silicone rubber is facilitated, and the application requirements in the fields of thermal management elastomers, damping elastomers and the like are met.

The invention belongs to the technical field of aluminum alloy processing, and particularly relates to a manufacturing method of a high-strength aluminum-lithium alloy plate, a non-homogenized casting blank is subjected to ultralow-temperature rolling, high-temperature rough rolling, ultralow-temperature finish rolling and aging treatment, the casting blank is made of aluminum-lithium alloy, the rolling temperature of ultralow-temperature rolling and ultralow-temperature finish rolling ranges from-196 DEG C to-100 DEG C, the temperature of high-temperature rough rolling ranges from-20 DEG C to-30 DEG C, and the temperature of high-temperature rough rolling ranges from-20 DEG C to-30 DEG C; the rolling temperature of the high-temperature rough rolling is 360-480 DEG C, and the total deformation is not less than 80%; the aluminum alloy plate is finer in crystal grain, higher in strength, better in ductility, higher in forming precision and better in surface quality.

The invention discloses a preparation method of a printing material for three-dimensional printing, the printing material is formed by mixing a new printing material, a first printing material and a second printing material, the new printing material is a printing material which is not used, the first printing material is a printing material which is not used and is not adhered to a three-dimensional printing piece, and the second printing material is a printing material which is not adhered to the three-dimensional printing piece. The second printing material is a printing material which has been used, is adhered to the three-dimensional printing piece, is removed from the three-dimensional printing piece and is not mixed with other solid particles. By adopting the technical scheme, compared with the prior art, the old powder can be utilized more sufficiently or more reasonably.

The invention discloses a three-dimensional printing post-processing workstation, a three-dimensional printing post-processing system and a three-dimensional printing post-processing method. The three-dimensional printing post-processing workstation comprises a body and a powder removing device, and the powder removing device is arranged in the body and is suitable for placing a three-dimensional printing piece adhered with a printing material and taking out the three-dimensional printing piece. And the powder removing device is used for removing part of the printing material adhered to the three-dimensional printing piece from the three-dimensional printing piece by spraying gas. The three-dimensional printing post-processing system comprises the post-processing workstation. The three-dimensional printing post-processing method utilizes the three-dimensional printing post-processing workstation to recover the printing material adhered to the three-dimensional printing piece. By adopting the technical scheme, a material basis and corresponding preparation can be provided for fully or reasonably utilizing the old powder.

The invention relates to the technical field of safety helmets, in particular to a composite material for a safety helmet, a preparation method of the composite material and the safety helmet. The composite material for the safety helmet is prepared from the following raw materials in parts by weight: 22 to 27 parts of unsaturated polyester, 4 to 6 parts of low-profile shrinking agent, 0.4 to 0.8 part of high-activity initiator, 1.6 to 2.4 parts of internal release agent, 0.2 to 0.6 part of thickening agent, 25 to 35 parts of flame retardant, 25 to 35 parts of glass fiber, 0 to 5 parts of internal coloring pigment and 2 to 6 parts of auxiliary agent. The safety helmet has the advantage that the heat resistance and the production efficiency of the safety helmet are improved.

The invention relates to a zero-dripping flame-retardant flexible cable and a preparation method thereof. The zero-dripping flame-retardant sheath material comprises the following components in percentage by weight: 10%-30% of EVA (Ethylene Vinyl Acetate), 1%-10% of POE (Polyolefin Elastomer), 1%-10% of LLDPE (Linear Low Density Polyethylene), 1%-10% of HDPE (High-Density Polyethylene), 1%-10% of a compatilizer, 0.1%-0.5% of an antioxidant, 20%-50% of an inorganic flame retardant, 0.2%-1% of carbon black, 0.5%-1% of silicone, 0.15%-0.5% of EBS (Ethylene Butylene Styrene), 0.01%-0.6% of TAIC (Triallyl The inorganic flame retardant comprises 10%-40% of magnesium hydroxide and 10%-40% of aluminum hydroxide, ethylene-methacrylic acid is selected as the compatilizer, a hindered phenol type antioxidant is selected as the antioxidant, and sepiolite is selected as the charring agent. The flame-retardant sheath prepared from the zero-dripping flame-retardant sheath material designed by the invention has excellent mechanical property and flame-retardant property, good flame-retardant effect, high carbon shell strength after combustion and no dripping phenomenon.

The invention discloses a preparation method of a near-net forming refrigerant runner plate, which comprises the following steps: A, aiming at a refrigerant runner plate with a complex structure, designing a mold, a salt core structure and a combination mode of the mold and the salt core structure on the basis of a casting method; b, preparing an alloy raw material, a mold and a salt core, preheating and assembling the mold and the salt core, and casting a melt obtained by melting the alloy raw material to obtain a blank; and C, the blank is subjected to aftertreatment, and the refrigerant runner plate is obtained. According to the invention, the casting process of the runner plate is effectively improved, so that the near-net forming of the runner plate is realized, the machining workload is obviously reduced, the preparation process is shortened, and the cost is reduced.

The invention relates to the field of nylon flame retardance, in particular to a halogen-free flame-retardant tracking-resistant nylon 66 composition. The composition is mainly prepared from the following raw materials in parts by weight: 70 parts of nylon 66 resin; 15 to 30 parts of glass fiber; 10 to 20 parts of a compound flame retardant; 1-3 parts of an auxiliary flame retardant additive; 0.5 to 1.5 parts of a glass fiber dispersing agent (TAF); and 0.5 to 1 part of an antioxidant. The product has good flame retardance and tracking resistance, and can be applied to the industries of automobiles and electronics.

The invention discloses degradable flame-retardant phenolic aerogel as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a phenolic compound, an aldehyde compound, water, arylboronic acid or a derivative thereof and a catalyst according to a ratio, and carrying out primary hydrothermal reaction at 70-100 DEG C for 0.5-3 hours; after the first hydrothermal reaction is completed, cooling, then adding a flame retardant, and carrying out a second hydrothermal reaction at 120-160 DEG C for 0.5-6 hours to obtain phenolic hydrogel; freezing and drying the phenolic aldehyde hydrogel, and curing to obtain phenolic aldehyde aerogel; the flame retardant is selected from at least one of aluminum hydroxide, magnesium oxychloride, antimony trioxide and zinc borate. The additive flame retardant is added at the later stage of the hydrothermal reaction, so that the damage to the network structure of the phenolic resin is avoided, the heat resistance and the mechanical property of the phenolic aerogel are prevented from being reduced, and the phenolic aerogel is obvious in light weight effect, good in flame retardant property and good in mechanical property.

The invention belongs to the technical field of brake friction materials and powder metallurgy, and discloses a preparation and regulation method for a three-dimensional latticed structure in a copper-based brake friction material. The copper-based brake friction material is mainly composed of copper-coated iron powder, molybdenum disulfide, crystalline flake graphite, silicon dioxide, superfine copper powder and other functional components. Wherein the three-dimensional latticed structure is constructed by superfine copper powder, and the comprehensive performance of the copper-based brake friction material is improved through multiple excellent performances such as high heat conduction performance and mechanical strength of the three-dimensional latticed structure; according to the invention, structural design and preparation are carried out on raw material powder by adopting a method of prefabricated particle preparation and particle bonding and coating, so that all functional components are uniformly distributed on the friction material, a three-dimensional latticed structure can be constructed, and the mechanical property and tribological property of the friction material are greatly improved; the copper-based brake friction material is high in mechanical performance, stable in friction coefficient, high in heat conduction performance, low in wear rate and excellent in performance under extreme working conditions.

The invention is suitable for the technical field of materials, and discloses silica gel and a preparation method thereof, and a silica gel product and a preparation method thereof. Wherein the silica gel comprises a first component and a second component, the first component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide and a vulcanizing agent, and the second component comprises a base material, a reinforcing agent, a modified filler, titanium dioxide, a cross-linking agent and a polymerization inhibitor. The silica gel provided by the invention not only has better mechanical properties, but also has a small friction coefficient, when the silica gel is in contact with skin, the adhesion feeling is low, the smooth effect is good, and the smooth feeling and the skin-friendly property are improved. Moreover, two components, namely the first component and the second component, are arranged, the first component and the second component are stored separately, the material is easy to store and stable in performance, the service life of the product can be prolonged, in addition, the material preparation and forming process is simple, the vulcanization time is short, and the production efficiency is greatly improved.

This invention discloses a method and system for the comprehensive utilization of catalytic oil slurry. The method first involves hydrogenating the catalytic oil slurry. The separated hydrogenated tail oil then undergoes a cracking reaction. The cracking products are treated with an extractant. After separation, the extract phase is processed by recovering the extractant to obtain aromatic oil. The heavy fraction obtained from the separation of the aromatic oil enters a coking reaction zone, where it reacts to yield oil gas and needle coke products. A comprehensive utilization system for catalytic oil slurry using the above method is also provided. The method and system of this invention can improve the mechanical strength of the obtained needle coke, effectively improve the microstructure of the needle coke, and obtain high-quality needle coke.

The invention relates to the technical field of building energy conservation, heat preservation and heat insulation materials, and discloses a flame-retardant phase-change heat preservation and heat insulation building material and a preparation method thereof.The preparation method of the flame-retardant phase-change heat preservation and heat insulation building material comprises the following steps that paraffin is loaded in ZnO / CuO hollow microspheres to obtain phase-change microspheres; modifying the phase change microspheres with polydopamine and acryloyl chloride to obtain functionalized phase change microspheres; the preparation method comprises the following steps: carrying out graft polymerization on a phosphorus-containing eugenol compound and 1-amino-5-hexene-2-alcohol on the functionalized phase change microspheres to obtain multifunctional phase change microspheres; polyether polyol, functionalized polyol, myricetin, multifunctional phase-change microspheres and the like are used as raw materials, foaming is performed, and the flame-retardant phase-change heat-preservation and heat-insulation building material is obtained. The flame-retardant phase-change heat-preservation and heat-insulation building material is excellent in heat-preservation and heat-insulation performance, flame-retardant performance and mechanical performance, has anti-ultraviolet performance and antibacterial and mildew-proof performance, can reduce erosion damage caused by external conditions, and prolongs the service life.

The invention discloses lamellar directionally-arranged boron nitride ceramic and a preparation method and application thereof, and belongs to the technical field of boron nitride ceramic preparation, and the method comprises the following steps: by using a template method, taking graphite as a matrix, alternately blade-coating inorganic glue and boron nitride powder on the surface of the matrix, and heating to prepare the lamellar directionally-arranged boron nitride ceramic. The lamellar directionally-arranged boron nitride ceramic prepared by the method can be used in the aerospace field of fighter tip radomes and the like, and has the characteristics of excellent high-temperature oxidation resistance and small change of mechanical properties along with temperature.

The application relates to the field of building engineering, in particular to a secondary structure system wall structure, which comprises a support frame, the support frame comprises a plurality of mutually parallel and length-adjustable longitudinal support pieces, and a transverse connecting piece between two adjacent longitudinal support pieces, the transverse connecting piece is length-adjustable, is perpendicular to the longitudinal support piece and is fixedly arranged at any position in the length direction of the longitudinal support piece, a masonry space for masonry brick masonry is formed between two adjacent transverse connecting pieces and two adjacent longitudinal support pieces, the interval between the longitudinal support piece and the transverse connecting piece is flexibly adjusted, the shape of the brick masonry can be changed as required, material loss is reduced, an integrated frame structure is formed, a concrete pouring structure frame is not needed, the construction process is simplified, and the construction efficiency is remarkably improved.

The invention relates to the technical field of medical instruments, in particular to a cutting method, an intervention structure and application, the cutting method comprises the following steps that a shade is installed at a preset position of a to-be-cut piece, and the shade is suitable for completely blocking cutting energy reaching the position so as to prevent the to-be-cut piece below from being cut; or the shade is suitable for blocking part of cutting energy reaching the position so as to prevent the to-be-cut piece below from being cut off; and under the condition that the cutting energy reaching the preset position is uninterrupted, the to-be-cut piece is cut. The cutting method, the intervention structure and the application are low in cost and short in machining time.

The invention relates to the technical field of electrical insulating materials for power transmission lines, and discloses a low-temperature-toughness durable high-hydrophobicity epoxy resin hybrid insulating material and a preparation method thereof. Comprising 50-100 parts of an epoxy monomer, 5-50 parts of a siloxane-based epoxy monomer, 30-80 parts of a curing agent, 8-20 parts of a polysiloxane modifier, 10-30 parts of a composite filler, 1-10 parts of an acid-base accelerator, 80-160 parts of aluminum hydroxide, 80-120 parts of silicon powder and 5-25 parts of a silane coupling agent. A chemical network structure on a molecular level is designed, a siloxane epoxy monomer with excellent low-temperature mechanical toughness and high hydrophobicity is introduced, a polysiloxane chain segment is subjected to modification treatment and chemically crosslinked with a functional group of a curing agent, the problem of interfacial compatibility is solved, a composite filler capable of improving compatibility is added, and the curing agent is prepared. According to a free radical reaction mechanism, the surface of the formed insulating material is subjected to rapid fluorination treatment, and the epoxy resin-based hybrid insulating material is endowed with mechanical toughness and lasting hydrophobic performance in a low-temperature environment.

The invention discloses a novel benzyl acrylate neutron / gamma discrimination plastic scintillator and a preparation method and application thereof. The plastic scintillator is composed of a polymer matrix, a main fluorescent dye and a secondary fluorescent dye, the polymer matrix is benzyl acrylate (BA), the main fluorescent dye is 2, 5-diphenyl oxazole (PPO), and the secondary fluorescent dye is 7-diethylamino-4-methylcoumarin (MDAC) or 9, 10-diphenyl anthracene (DPA). The prepared plastic scintillator uses a new organic polymer matrix, and compared with a plastic scintillator of the same type, the preparation cost is lower, the forming time is shorter, and the plastic scintillator has good stability, optical transparency and mechanical strength and has neutron-gamma discrimination capability.

This invention discloses a 6-series energy-absorbing aluminum alloy and its manufacturing method. The aluminum alloy, by mass percentage, comprises: Mg: 0.50–1.20%, Si: 0.40–1.00%, Mn: 0.15–0.95%, Cr: 0–0.25%, Fe: 0.15–0.45%, Ti: 0.015–0.30%, and Cu: 0.10–0.70%; wherein the Mg / Si mass ratio is ≥0.85 / 1, and the total content of Mn+Cr+Fe is ≤1.2%; it also includes an AlTi5C0.25 grain refiner and impurities with a content not exceeding 0.15%, with the balance being Al. This invention optimizes and precisely designs the content of the main alloying elements in the alloy, and introduces TiC nanoparticles using the AlTi5C0.25 grain refiner, enabling the aluminum alloy profile to possess both high strength and excellent crushability.