56results about How to "Good elasticity and plasticity" patented technology

The invention relates to the field of a ceramic tile and particularly provides a self-cleaning ceramic tile and a preparation method thereof. The self-cleaning ceramic tile mainly comprises an unglazed tile, a bottom-layer immobilizing membrane and a surface-layer immobilizing membrane; the surface of the unglazed tile is coated with the bottom-layer immobilizing membrane and the surface-layer immobilizing membrane sequentially; each of the bottom-layer immobilizing membrane and the surface-layer immobilizing membrane consists of specific components with specific content; tiny pores exist on the surface of the unglazed tile, so that attachment of the bottom-layer immobilizing membrane is facilitated; the bottom-layer immobilizing membrane has strong adhesive force, is not liable to remove,has high extensibility, elastoplasticity, anti-cracking property, anti-permeability and weather resistance, and has high bondability with the unglazed tile and the surface-layer immobilizing membrane; the surface-layer immobilizing membrane can significantly improve the self-cleaning ability of the surface of the ceramic tile, and has high bondability with the bottom-layer immobilizing membrane and high weather resistance. In the self-cleaning ceramic tile, the unglazed tile, the bottom-layer immobilizing membrane and the surface-layer immobilizing membrane cooperate with one another to forma whole body, and the advantages of high self-cleaning ability, high chemical corrosion resistance, weather resistance, high stability and low cost are achieved.

The invention discloses a high-temperature alloy. The high-temperature alloy comprises the following raw materials of, by mass percent, 10.1-12.5% of Cr, 4.6-5.8% of Ti, 7.0-9.0% of Co, 2.0-2.25% of Mo, 7.0-9.0% of W, 6.25-6.75% of Al, less than or equal to 0.03% of Zr, less than or equal to 1.0% of Fe, 0.13-0.17% of C, 0.02-0.03% of B, less than or equal to 0.2% of Mn, less than or equal to 0.2%of Si, 3.25-3.75% of Ta, and the balance Ni. The invention further discloses a preparation method of the high-temperature alloy and belongs to the technical field of the high-temperature alloys. Compared with a similar formed material, the high-temperature alloy obtained by the preparation method has higher high-temperature endurance life and has the advantage of excellent resistance to thermal crack, and the thermal crack problem of the high-temperature alloy is solved greatly.

The invention discloses a method for preparing an unsaturated carboxylate solution modified concrete compound material. The method comprises the following steps of: mixing and stirring 20-60 parts of water and 100-150 parts of a magnesium acrylate solution for 2 minutes; respectively and sequentially adding 0.1-0.15 part of sodium persulfate and 5-12 parts of polypropylene fibers until the materials are uniformly dispersed to prepare a mixed solution A; mixing and stirring 300-400 parts of aggregates, 100 parts of cement, 0-40 parts of pulverized fuel ash, 0-10 parts of silica fume, 5-50 parts of sericite powder and 0-50 parts of white carbon black until the materials are uniformly dispersed, adding half mixed solution A, stirring for 2 minutes, adding the rest half mixed solution A, and stirring until the materials are uniformly dispersed. Compared with the prior art, the material has the advantages of convenience in construction, controllable curing time, good elastoplasticity, short construction time and the like and has a wide application prospect in the fields of expansion joints of highway, roads, bridges and other construction structures.

The invention discloses a high-entropy alloy for manufacturing a flexspline and a processing method of the flexspline, and belongs to the technical field of harmonic reducer manufacturing. The high-entropy alloy is an FeCoCrNiMo0.2C0.1 high-entropy alloy with an FCC type single-phase solid solution structure. The processing method of the flexspline comprises the steps of smelting of the FeCoCrNiMo0.2C0.1 high-entropy alloy; preparing of high-entropy alloy powders; pressing forming; sintering; hot forging; high-temperature annealing; cryogenic treatment; machining forming; and shot peening. Theaverage grain size of the flexspline prepared by the method is 3-4 [um]m, the tensile strength is over 1200 MPa, the yield strength is over 900 MPa, the elongation rate is over 30%, the strong plastic product is over 36000 MPa, and the flexspline has higher mechanical property and transmission property, so that the service life of a harmonic reducer is prolonged.

The invention relates to a one-component cold application water base waterproof coating. 46 percent of ethylene vinyl acetate copolymer, 25 percent of Ac-261 emulsion, 15 percent of ethylene tar, 3 percent of polyvinyl alcohol, 0.2 percent of alkyl phenol polyoxyethylene ether, 0.3 percent of tributyl phosphate, 0.3 percent of sodium hexametaphosphate, 6 percent of light calcium carbonate, 5 percent of iron oxide and 0.2 percent of UV resistant agent are taken and put into a reaction vessel and evenly stirred quickly. The invention has the advantages of non-toxic, tastelessness, no pollution, decay resistance, good elastic-plastic performance, safe and convenient construction, excellent waterproof property, strong adhesion, large elongation of film forming area, severe cold tolerance, high temperature resistance, aging resistance, high airtightness and watertightness performance, easy maintenance, good stability and heat insulation property, fireproof performance and safe transportation and storage.

The invention provides a low-smoke halogen-free flame-retardant waterproof board or drain board, which comprises the following raw materials in parts by weight: 30-90 parts of ethylene-vinyl acetate copolymer, 20-50 parts of linear low-density polyethylene, 1-50 parts of high-density polyethylene, 0.5-5 parts of a silane coupling agent, 5-45 parts of an elastomer POE15, 10-60 parts of nano magnesium hydroxide, 5-40 parts of a phosphorus-nitrogen flame retardant, 0.01-3 parts of an ultraviolet absorber and 0.5-1.5 parts of an antioxidant. The waterproof board provided by the invention is an equal-thickness flat plate with smooth two surfaces; and the drain board is a flat plate with one side being smooth and the other side provided with solid bosses arranged regularly. The invention also provides a preparation method of the waterproof board or the drain board. The waterproof board or the drain board provided by the invention has good flame-retardant property and mechanical property.

The present invention relates to the technical field of unglazed ceramic processing and particularly provides a coating slurry material and a coating used for unglazed ceramic surfaces, an unglazed ceramic tile and preparation methods thereof. The provided coating slurry material used for the unglazed ceramic surfaces comprises epoxy acrylate resin, glycerin alkyd resin, 400-mesh quartz powder, 325-mesh alpha-alumina powder, hydroxyl-fluoro silicone oil, poly (butyl acrylate), chlorinated paraffin, emulsified silicone oil, dibutyl phthalate and propanol. The above coating slurry material is sprayed onto the surface of the unglazed ceramic tile by a spray gun; and drying is conducted to obtain the unglazed ceramic tile. The coating has good elongation, elastoplasticity, crack resistance, permeability resistance and weather resistance. When multilayer processing is conducted on the unglazed ceramic surfaces, the coating can also be used as a good transition layer to improve binding of other materials to unglazed ceramic green body.

The invention discloses an asphalt road joint filling agent which is prepared from the following raw materials in parts by weight: 3.5 parts of polyvinyl alcohol, 2.5 parts of cobalt oxide powder with the particle size of 30-40 nm, 9 parts of propylene glycol methyl ether acetate, 1 part of sodium pyrophosphate, 3 parts of sodium polyacrylate, 32 parts of Korea SK90# asphalt, 1.2 parts of potassium fluoroaluminate, 4.5 parts of silicon dioxide powder with the particle size of 40-50 nm, 3 parts of zirconium carbide powder with the particle size of 400-500 nm and 0.6 part of 2-ethyl-4-methylimidazole. The asphalt road joint filling agent is prepared through a special formula and a corresponding process; especially due to the addition of composite nanopowder, the overall performance of the asphalt road joint filling agent is improved; the asphalt road joint filling agent is good in waterproof property, adhesion property, elastoplasticity, embedding resistance and durability, and especially outstanding in high temperature stability, low temperature flexibility and extensibility.

The invention discloses a base isolating device. The device is a support which is mounted between an upper structure and a base structure of a building and turns into one part of the upper structure and the base structure of the building, a gap is formed between the upper structure and the base structure of the building so that the upper structure of the building can be prevented from being corroded, and the service life is prolonged. The support is used for connecting a middle concave steel plate and a lower base plate through a plurality of oil dampers and a plurality of ball buffers, the earthquake absorbing power is increased by increasing the spring height, and thus the effect of base isolation can be achieved. The base isolating device is reasonable in design, the oil dampers, the ball buffers, spiral springs and elastic buffer balls are ingeniously combined together to achieve combined action so that the response accelerated speed and deformation of the upper structure can be decreased, vibration transmitted to the upper structure is reduced, the horizontal stiffness is small, the earthquake response of the upper structure is also made smaller, good elastic-plastic performance is achieved, the original state can be recovered automatically, the seismic isolation effect is good, earthquake disasters are lightened, and the personal casualties and property losses are reduced.

The invention relates to the technical field of building materials, in particular to a preparation method of a waterproof coating. The method comprises the following steps of: (1) mixing ethyl orthosilicate, fly ash, brick residue powder and propylene glycol for 30-60 minutes; (2) mixing the mixed solution obtained in the step (1) with a silane coupling agent, adding water to carry out a first reaction for 3-5 h, and then carrying out filtration, washing and drying; (3) mixing the first reactant obtained in the step (2) with polyurethane, and carrying out a second reaction for 3-5 hours; and (4) mixing the second reactant obtained in the step (3) with an inorganic filler for 0.5-3 hours. The method is high in environmental protection property, isocyanate and other substances harmful to thehuman body do not need to be added, the waste can be fully utilized, and the utilization amount of the waste is increased on the basis that it is guaranteed that the prepared waterproof coating has good extensibility, elastoplasticity, crack resistance and weather resistance.

The invention provides a cement paste which comprises cement, a fluid loss agent, a dispersant, a foaming agent, a foam stabilizer, an early strength agent and water, wherein the foaming agent comprises a protein type foaming agent. The invention further provides a foamed cement system based on the cement paste, and application of the cement paste. On the basis of the cement paste, filling foams which are good in stability are introduced, and foamed cement stone formed after the cement paste is cured is high in strength and good in elastoplasticity.

The invention discloses a road crack sealant which is prepared from the following raw materials in parts by weight: 2kg-3kg of nanometer neodymium oxide, 19-23 parts of polypropylene glycol, 12-15 parts of polymethylene polyphenyl polyisocyanates, 2-3 parts of dimethylolbutanoic acid, 1-1.5 parts of benzene sulfonic acid sodium, 1-1.5 parts of crosslinked povidone, 6-8 parts of nanometer titanium nitride, 18-25 parts of phenolic resin 2130, 6-9 parts of dolomite powder, 24-28 parts of petroleum asphalt, 10-12 parts of hydroxypropyl methyl cellulose and 2-2.5 parts of zinc tetrafluoroborate hydrate. Prepared by compounding various components and active powder, the road crack sealant disclosed by the invention is good in waterproofness and elasticity and extremely good in road surface adhesivity, and also is quite good in heat resistance and wear resistance.

The invention discloses an assembly type awning beam method based on digital twinning, which relates to the technical field of constructional engineering. An awning beam (made into a box-shaped section), a steel pipe and digital twinning equipment are arranged. A virtual model is firstly constructed through a modeling platform (BIM technology), the model can truly reflect physical components, complete technical disclosure and cooperative work of all professions can be achieved, prediction of the stress and the service life of the components can be reflected in the operation and maintenance stage, the concrete-filled steel tube beam with the box-shaped section is prefabricated in a factory, and a certain number of torsion longitudinal bars are arranged on the long side of the box-shaped section. According to the novel design method of the assembly type awning beam based on the digital twinning, the digital twinning, the box-shaped section and the concrete filled steel tube material areparticularly adopted, the defects of a traditional awning beam are overcome through complementation of the advantages of various technologies and materials, and the optimal design of a torsion component is practically achieved.

The invention discloses a novel 3D printing bar extrusion mechanism. The novel 3D printing bar extrusion mechanism comprises a driving gear and a driven gear; the driving gear and the driven gear areengaged with each other, the driving gear is installed on a first device, the driven gear is installed on a second device, and the first device and the second device are consistent in structure and each comprise a synchronous belt, a top synchronous wheel and a bottom synchronous wheel; positioning sleeves are arranged at the upper ends of the first device and the second device; heating devices are arranged at the lower ends of the first device and the second device; and nozzles are arranged at the bottoms of the heating devices. According to the novel 3D printing bar extrusion mechanism, theself-adaption of the size of the bar within a certain range is realized, and the continuous conveying and extrusion of multiple sections of bars are ensured, so that the adaptability and continuity inthe actual printing process are ensured, a foundation is laid for automatic feeding, and the material application range of the fused deposition modeling 3D printing technology is expanded.

The invention discloses a concrete column strengthening method of a compressive pre-stress steel casing rebar planting extension cross section. The concrete column strengthening method of the compressive pre-stress steel casing rebar planting extension cross section comprises the following steps that a steel casing matched with the shape of a reinforced concrete column is adopted to exert an annular pre-stress on a rebar concrete column, radiation rebar is welded on the outer surface of the steel casing and in perpendicular to the outer surface of the steel casing, an annular stirrup is arranged on the free end of the radiation rebar, longitudinal bars are vertically welded on the interior of the annular stirrup in the axial direction of the reinforced concrete column, finally a template is established outside the annular stirrup, and concrete is casted. According to the concrete column strengthening method of the compressive pre-stress steel casing rebar planting extending cross section, the original concrete column structure is not destructed, the pre-stress is exerted on the original structure, and therefore the force sate of original concrete changes from a two-way pre-stress state to a three-way pre-stress state, the compressive strength of the concrete is improved and then the structure bearing capacity of the reinforced column is improved; the ductility performance of the component is greatly improved, the energy-dissipating capacity is greatly improved, and the structure has the excellent anti-seismic property. The concrete column strengthening method of the compressive pre-stress steel casing rebar planting extension cross section is applicable to reinforcing the concrete component in engineering.

The invention discloses a structure for repairing a pit slot of an asphalt pavement by precast blocks. The structure comprises a first interface adhesive layer, a first geotextile grating layer, a cement-emulsified asphalt mortar layer 2, a second geotextile grating layer, a second adhesive layer and a precast block layer which are arranged at the bottom of the pit slot from bottom to top in sequence; the interface adhesive layer comprises raw materials as follows: modified asphalt, epoxy resin, butyl cellosolve, n-butyl alcohol, methylacrylic acid, styrene, triethylene glycol dimethacrylate,poly2,6-dimethyl-1,4-phenyl ether, polyvinyl acetate, dimethylethanolamine, alpha,omega-dihydroxyl polydimethylsiloxane, nano-silica, graphite powder, polypropylene fiber, fly ash, a tackifier, a chain extender, a cross-linking agent and a plasticizer. By means of the synergistic effect of an interface adhesive, geogrids and cement-emulsified asphalt mortar, the pavement precast blocks and the original pavement are tightly bonded to form an overall stressed structure.

The invention discloses a waterborne polyurethane emulsion and a preparation method. The waterborne polyurethane emulsion is prepared from the following components in parts by weight: 0.1-0.2 part ofdibutyltin dilaurate, 10-15 parts of polypropylene glycol 2000, 5-8 parts of polyadipic acid-1,4-butanediol ester, 1.3-2 parts of 2,2-dimethylolpropionic acid, 10-15 parts of isophorone diisocyanate,0.5-0.85 part of pentaerythritol, 6-8 parts of acetone, 1.5-2 parts of 1,4-butanediol, 0.8-1.2 parts of triethylamine, 1-2 parts of gamma- aminopropyltriethoxysilane and 55-60 parts of water. The invention also discloses a waterborne polyurethane cooling coating and a preparation method. The waterborne polyurethane cooling coating is prepared from the following components in parts by weight: 90-95parts of waterborne polyurethane emulsion, 0.1-0.5 part of ammonia water, 0-2 parts of color paste, 0.1-0.5 part of a dispersant, 4-6 parts of cooling reflective filler, 0.5-0.8 part of a defoamer, 0.2-0.4 part of a thickener, 0.5-1.5 parts of a flatting agent and 5-10 parts of dipropylene glycol monomethyl ether.

The invention discloses a novel 3D printing bar material extrusion mechanism, which includes a driving gear and a driven gear, the driving gear and the driven gear mesh with each other, the driving gear is installed on the first device, and the driven gear is installed on the second device , the structure of the first device is consistent with that of the second device, both including a synchronous belt, a top synchronous wheel and a bottom synchronous wheel; the upper end of the first device and the second device is provided with a positioning sleeve, the lower end is provided with a heating device, and the bottom of the heating device is provided with a nozzle. The invention realizes the self-adaptation of the size of the bar material within a certain range, and ensures the continuous transmission and extrusion of the multi-section bar material, so as to ensure the adaptability and continuity in the actual printing process, lay the foundation for automatic feeding, and Improve the application range of materials for fused lamination molding 3D printing technology.

The invention discloses an outdoor cable bridge with the long service life, and the bridge comprises a cable bridge, and the cable bridge comprises a box body. Two sides of the top of the box body arefixedly connected with positioning blocks, and a positioning housing is disposed between the surfaces of the two positioning blocks in a sleeved manner. The cable bridge comprises a base layer, and the surface of the base layer is sleeved by a reinforcing layer. The surface of the reinforcing layer is sleeved by a high temperature resistant layer, and the surface of the high temperature resistantlayer is sleeved by an anti-corrosion layer. The surface of the anti-corrosion layer is sleeved by an anti-oxidation layer, and the surface of the anti-oxidation layer is provided with a wear-resistant layer. The surface of the wear-resistant layer is sleeved by a paint layer, and the anti-oxidation layer is made of zinc. Through the setting and cooperation of the cable bridge, the base layer, the reinforcing layer, the high temperature resistant layer, the anti-corrosion layer, the anti-oxidation layer, the wear-resistant layer, the paint layer, the box body, the positioning blocks and the positioning housing, a problem that the service life of a conventional cable bridge is short is solved.

The invention discloses a method for reproducing antibacterial corrugated paper from high-salinity high-hardness waste paper sludge. Through a technical means of combining a physical method and a chemical method, the waste paper sludge is recovered and used for producing the corrugated paper with an antibacterial function, the sticker weight of waste paper fibers subjected to surface modificationis reduced by 2%, thus the difficulty level of dehydration during paper making of a paper machine is reduced, physical indexes of water absorption, ring crush and the like of the made paper are improved, paper breaking of the paper machine is reduced, the operating rate of the paper machine is improved, and no secondary pollution is caused for the environment; and primary corrugated paper obtainedthrough sizing treatment of the method already has very stable corrugated paper characteristics, has excellent extensibility, elastoplasticity, crack resistance, anti-permeability and weather resistance, can have effects of water prevention, seepage prevention and protection, and is prevented from being affected with damp, a water-resistant grade reaches an ISO 4 grade, and breeding of bacteria in the corrugated paper can be effectively avoided.

The invention discloses ultrahigh-strength steel with a near net shaping function and a preparation method thereof, and belongs to the technical field of manufacturing of ultrahigh-strength steel. Thepreparation method comprises the steps of S1, material preparation; S2, alloy smelting; S3, performance heat treatment, specifically, an alloy ingot obtained in step S2 is placed in a heat treatmentfurnace so as to be subject to performance heat treatment, and according to the specific process of performance heat treatment, heat preservation is conducted for 12-24 h at the temperature of 900-1150 DEGC, then the alloy ingot is cooled to the temperature of 500-750 DEGC with the furnace and then is maintained at the temperature of 5-10 h, and finally, the alloy ingot is air-cooled to the room temperature; and S4, pressure processing of alloy. Compared with similar materials, the ultrahigh-strength steel having the near net shaping function and prepared through the process has the advantagesof excellent mechanical property and near net shaping function.

The invention provides a pavement crack pouring material and a preparation method and application thereof. The pavement crack pouring material is prepared from a material comprising the following components: 80 weight parts to 100 weight parts of asphalt, 3 weight parts to 15 weight parts of fibers, 1 weight part to 160 weight parts of filler, 1 weight part to 6 weight parts of water and 0.1 weight part to 2 weight parts of foaming agent. Compared to the prior art, the pavement crack pouring material provided by the invention adopts the components with specific content and achieves a good interaction, and the obtained pavement crack pouring material has low viscidity and good liquidity in the construction process and can well enter a deep position of a crack in a normal temperature state;the pavement crack pouring material has high adhesion stress after being cured, has good elastoplasticity and is good in environmental adaptability, and the pavement crack pouring material contains acertain sealed air holes, and thus, thermal expansion and contraction deformation of the crack, which is generated under the high and low temperature action, can be improved; and thus, pavement conditions and actual construction requirements can be met, and the pavement crack pouring material is a crack pouring material applicable to various asphalt pavements such as a highway, a municipal serviceroad, a rural highway and the like.

The invention discloses polymer composite asphalt, which is prepared from the following raw materials in parts by weight: 77-84 parts of petroleum asphalt, 0.4-0.5 part of acryloyloxyethyl trimethyl ammonium chloride, 1.2-1.5 parts of lauroamide propyl betaine, 8-9 parts of water, 8-12 parts of sericite powder, 2-3 parts of edetic acid, 0.6-0.8 part of dibenzoyl peroxide, 6-8 parts of butanetetracarboxylic acid, 9-11 parts of poly-alpha-olefin and 5-6 parts of polyvinyl alcohol; and the sericite powder is prepared from 2500-mesh sericite powder, 1250-mesh sericite powder and 600-mesh sericite powder at the ratio of 1 to 2 to 1. The components are very excellent in overall performance by combination; and the polymer composite asphalt has relatively good liquidity, heat stability and water resistance, and outstanding tenacity and elastoplasticity.

The invention belongs to the technical field of petroleum and natural gas exploitation, and discloses a sand control screen pipe flow control system, method and device and a petroleum downhole drilling and production tool. Fluid enters a fixed-precision sand blocking layer through a rectangular through hole in a protection module, first-stage sand control treatment is conducted, and the fluid enters an overflowing area control module and then enters a pipeline through a screen; and when the flow of a screen pipe needs to be adjusted, a heating cavity supplies heat through power supply of a power transmission cable, memory metal is heated, a sliding block is stretched and moved through the two-way memory effect of the memory metal, the position of the sliding block in an overflowing area control structure is changed, the overflowing area of the fluid is changed, and screen pipe flow control is achieved. According to the sand control screen pipe flow control system, method and device andthe petroleum downhole drilling and production tool, the flow of the fluid flowing through the screen pipe is adjusted in real time in the petroleum field production process; the method for controlling the oil well yield at the position of the sand control screen pipe is provided through the characteristics of the memory metal; and the flow of the fluid of the sand control screen pipe is adjustedin real time in the petroleum field production process. Compared with a sand control screen pipe in the prior art, the flow of the sand control screen pipe is controlled.

The invention provides a waterproof coating capable of chemical crosslinking and physical mortise and tenon with cement. The waterproof coating is characterized by comprising the following raw materials by weight: 20-50 parts of a synthetic rubber latex, 20-50 parts of emulsified asphalt, 0.5-2 parts of a functional additive and 0.5-2 parts of a dispersant, 20-40 parts of a filler and 10-25 parts of water. The principle is that through coupling effect of the functional additive, part of the molecules in the synthetic rubber and most molecules in the asphalt couple into large molecules with reaction activity; when the large molecules contact with a base plane, the non-reactive molecule segments of the rubber and asphalt and the base plane form physical adsorption, and the molecular segments with reaction activity conduct react with the base plane to form chemical bond effect, so as to generate strong adhesive force; and after bonding, the coating is hardly influenced by environmental factors. Therefore, the waterproof coating provided by the invention has excellent waterproof performance.

The invention discloses a cold welding seam agent for a building road and a preparation method thereof, and relates to the technical field of preparation of constructional engineering. The modified asphalt is prepared from the following components in parts by weight: 10-12 parts of CoO.Co2O3, 10-20 parts of an organic solvent, 6-8 parts of a flocculating agent, 3-8 parts of a stabilizer, 10-20 parts of chlorinated paraffin, 50-70 parts of matrix asphalt, 0.5-1 part of a cross-linking agent, 8-10 parts of an emulsifier, 10-15 parts of 2-ethyl-4-methylimidazole, 15-20 parts of fibers and 50-60 parts of water. According to the cold welding seam agent for the building road and the preparation method, the matrix asphalt and the chlorinated paraffin are added, so that the overall performance ofthe cold welding seam agent is improved; by adding the fiber, the mechanical property is improved, and the prepared cold welding seam agent has good sliding performance and is easy to construct; by adding the organic solvent, CoO.Co2O3, flocculant, stabilizer, cross-linking agent and 2-ethyl-4-methylimidazole for sufficient emulsification, the cold welding seam agent has the advantages of higher bonding strength, excellent elongation, higher wear resistance, longer service life, favorable embeddability and favorable durability.

The invention discloses a preparation method of a carbon nanotube-coated silica microsphere composite nanomaterial, specifically: using SiO 2 Nano-microspheres are used as templates, which are dispersed in cationic surfactants, and then MMA monomer is added to form SiO by seed emulsion polymerization. 2 as the core and PMMA as the shell; then the PMMA-modified CNT is coated on the outermost layer of the nanocomposite particle by hydrothermal reaction, and the excess PMMA is removed to obtain the CNT-coated SiO 2 Nanomaterials with a core-shell structure formed by nanospheres. The invention uses polymer PMMA as an intermediate bridge to prepare CNT-coated SiO 2 Microsphere composite nanomaterials, the obtained composite nanomaterials have the characteristics of low density, high strength, and good elasticity and plasticity. In addition, the present invention has simple operation and low cost, and the prepared CNT-coated SiO 2 The formed nano-microspheres with core-shell structure are uniform in shape and size.

The invention discloses an anti-punching steel truss. The anti-punching steel truss comprises two upper longitudinal chord members and two lower longitudinal chord members, wherein the two upper longitudinal chord members at the upper part are arranged on the same horizontal plane in a bilateral symmetry mode; the two lower longitudinal chord members at the lower part are arranged on the same horizontal plane in a bilateral symmetry mode; the upper longitudinal chord member and the lower longitudinal chord member at each side are located on the same vertical plane; the upper longitudinal chord members and the lower longitudinal chord members at the two ends on the same side are connected through web members arranged vertically; the upper longitudinal chord members and the lower longitudinal chord members at the two ends on the same horizontal plane are connected through web members arranged horizontally; and an anti-punching web member is arranged between the upper longitudinal chord member and the lower longitudinal chord member at the same side. The anti-punching performance and ductility of a reinforced concrete slab column joint can be improved.

The invention discloses a method for preparing a forward-switched reversible thermochromic composite film and relates to preparation methods for reversible thermochromic composite films. The object of the invention is to solve the problems that the existing thermochromic films are reversely switched, are chromogenic at room temperature and are achromatic during heating-up, and the apparent integrity of a product can be destroyed and the attractiveness of the product is affected when the existing thermochromic films are applied to the surface of the product. The method comprises the steps: (1) pretreating a glass plate; (2) preparing a mixed solution; (3) preparing a coating solution; and (4) carrying out spraying and drying, thereby obtaining the forward-switched reversible thermochromic composite film. The reversible thermochromic composite film prepared by the method is forwardly switched, are achromatic at room temperature and are chromogenic during heating, so that the aim of keeping integrity of the product can be achieved when the reversible thermochromic composite film is applied to the surface of the product; and the forward-switched reversible thermochromic composite film prepared by the method has relatively good elastoplasticity and is environmentally friendly, environment-friendly, non-toxic and harmless. The invention can achieve the method for preparing the forward-switched reversible thermochromic composite film.