1426 results about "Nanostructured carbon" patented technology

The invention discloses a carbon composite ceramic linear resistor and a preparation method thereof, and belongs to the technical field of power electronic components. The invention provides a preparation method of a carbon composite ceramic linear resistor, which comprises the following steps: uniformly mixing bentonite, silicon carbide and nano carbon black to obtain powder, uniformly mixing the powder and ethanol, drying, adding a binder solution, and carrying out green body forming to obtain a green body; carrying out heat preservation on the green body at 1150-1300 DEG C in a nitrogen-containing gas atmosphere to obtain a sample; and polishing the sample, and spraying aluminum to obtain the carbon composite ceramic linear resistor. According to the method for preparing the carbon composite ceramic linear resistor, the resistivity of the material can be reduced, and the thermal shock resistance of the ceramic resistor can be improved.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polypropylene composite material for a filter plate and a preparation method of the high-strength polypropylene composite material. The preparation method of the polypropylene composite material comprises the following steps: uniformly mixing polypropylene, polyimide, maleic anhydride grafted polypropylene, nylon 6, a maleic anhydride grafted styrene-butadiene-styrene copolymer, aminated calcium carbonate, modified glass fiber, an antioxidant and a lubricant according to a mass ratio of 100: (12-18): (2-5): (1-2): (3-5): (3-7): (6-10): (0.2-0.5): (0.1-0.3), carrying out melt blending, extruding, cooling, granulating, and carrying out extrusion molding to obtain the polypropylene composite material. Through the synergistic effect of the nano calcium carbonate and the glass fibers, the mechanical property of polypropylene is improved, all the raw materials are crosslinked to form a uniform network structure, more energy is absorbed when a matrix is impacted by external force, and it is guaranteed that the filter pressing plate is not damaged when deforming under the high-temperature and high-pressure conditions; the obtained polypropylene composite material is high in strength, good in heat resistance and excellent in comprehensive performance.

The invention relates to a mildew-proof silicone sealant with high curing rate and high adhesive strength, and belongs to the technical field of adhesives. The anti-mildew coating is prepared from alpha, omega-dihydroxy polydimethylsiloxane, dimethyl silicone oil, fumed silica, phenoxy resin coated nano calcium carbonate, a modified hydroxypropyl-gamma-cyclodextrin loaded mildew preventive, dibutyltin dilaurate, methyltrimethoxysilane and a curing accelerator. According to the mildew-proof silicone sealant with the high curing rate and the high adhesive strength, the surface drying time is 9-13 minutes, the 24-hour curing depth is 6.3-7.2 mm, the adhesive strength is 3.0-3.6 MPa, the tensile strength is 5.8-6.4 MPa, the shear strength is 3.0-3.9 MPa, the elongation at break is 410-457%, and the mildew-proof grade is 0 grade in 30 days, 60 days, 180 days and 360 days.

The invention belongs to the technical field of material surface plating, and particularly relates to an aero-engine blade and a preparation method thereof. According to the preparation method, the component nano silicon carbide of the blade material is subjected to modification treatment, meanwhile, the carbon fiber composite material is introduced for common use, and the composite coating is formed on the surface through spraying treatment, so that the aero-engine blade is prepared, the cold and heat cycle resistance is effectively improved, and meanwhile, good erosion resistance is obtained.

The invention relates to the technical field of biological induction of calcium carbonate deposition, in particular to self-repairing concrete for biological induction of calcium carbonate deposition and a preparation method thereof. The cement comprises the following components in parts by weight: 320-380 parts of Portland cement and the like. The biomineralization composite inducer contains a genetically engineered bacterium solution, a urea-calcium chloride solution and a nano strontium carbonate seed crystal; the nano silicon dioxide-graphene composite powder is prepared by chemical vapor deposition; the wall material of the double-response microcapsule contains a temperature-sensitive polymer, and the core material contains a plurality of components; nanocellulose whiskers are also added; self-repairing is achieved through cooperation of multiple components, and all the components are specially treated or prepared. The self-repairing concrete is high in self-repairing efficiency, and wide cracks can be repaired; the mechanical property is excellent, and the compression strength and the breaking strength are remarkably improved; working performance is good, and construction is convenient; durability is good, and erosion and permeability are resisted; environmental protection and economy are considered, and the application prospect is wide.

The invention discloses shrinkage-free aluminoferrite cement-based ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of novel wall materials, and the shrinkage-free aluminoferrite cement-based ultra-high performance concrete comprises the following components: an activated cementing material, mineralized aggregate, an additive, reinforced fibers and mixing water. Due to the slow release effect of the methyl cellulose coating on the composite expanding agent, precise compensation of self-constriction is achieved, and contraction deformation in the curing and using process is effectively inhibited. Due to the unique mineral composition of the aluminoferrite cement, the early strength of the concrete is sharply improved, and the production cycle of prefabricated parts is greatly shortened. The steel fibers subjected to sand blasting and pre-wrapping modification can effectively bridge microcracks in the concrete and limit crack propagation; the polycarboxylate superplasticizer disperses the modified carbon nanofibers, crack initiation is inhibited from the microscopic level, and mechanical properties such as fracture resistance and impact resistance of the joint part and the prefabricated part are remarkably improved through cooperation of the polycarboxylate superplasticizer and the modified carbon nanofibers.

A solid-liquid separation device and a method of use. The solid-liquid separation device comprises a bottom plate (6). A machine body (1) is fixedly connected to the middle of the top end of the bottom plate (6), the front end of the machine body (1) is fixedly connected to a motor (11), an output end of the motor (11) is fixedly connected to an automatic drying mechanism (8), the automatic drying mechanism (8) is connected to a vibration mechanism (7) by means of a transmission assembly (4), and a feeding hopper (2) is fixedly connected at the top end of the machine body (1). The automatic drying mechanism (8) comprises a turnplate (808) and an air cylinder (802). The turnplate (808) is fixedly connected at the output end of the motor (11), a fixing column (810) is fixedly connected at an eccentric position on an outer portion of the turnplate (808), and a circular column (811) is slidably and fixedly connected to the bottom end of the outer portion of the turnplate (808). The air cylinder (802) is fixedly connected to the front side of the top end of the bottom plate (6). A heating box (801), a connecting pipe (803), air inlet one-way valves (806), a movable strip (807) and other structures are used in coordination, so that automatic drying treatment can be performed after solid-liquid separation of nano calcium carbonate. The overall structure is reasonably designed and is convenient for users.

The present application belongs to the field of polymer material technology, and in particular, relates to a polyimide composite material, a preparation method thereof, and an application thereof. The preparation method of the polyimide composite material comprises the steps of: preparing a polyamic acid slurry from a diamine monomer, a dianhydride monomer, and an organic solvent; preparing a mixed slurry from the polyamic acid slurry and a nanomaterial, and then performing a spinning imidization treatment to obtain a polyimide composite material; wherein the nanomaterial comprises at least one of nano silicon carbide, aluminum nitride, carbon nanotubes, graphene, and nano silicon dioxide. By blending polyimide with other nanomaterials having high thermal conductivity to improve its thermal conductivity, the thermal conductivity of the polyimide composite material is optimized and improved, and its heat dissipation capacity in a high temperature working environment is enhanced, while having high tensile strength and thermal conductivity. The service life of the polyimide composite material is extended, and its application range can be further expanded, such as in the back panel assembly of a smartphone.

The invention belongs to the field of modified self-repairing calcium aluminate cement 3D printing, and particularly relates to a phosphate modified self-repairing calcium aluminate cement 3D printing material and a preparation method thereof. The phosphate modified self-repairing calcium aluminate cement 3D printing material prepared by the invention is prepared from the following raw materials in parts by mass: 60 to 70 parts of calcium aluminate cement, 3 to 7 parts of silica fume, 2 to 4 parts of metakaolin, 0.5 to 3.5 parts of double-template modified calcium bentonite, 0.8 to 1.5 parts of amino modified sodium polyphosphate and 0.15 to 0.8 part of basalt fiber. The invention relates to a concrete anti-microbial agent, which is prepared from the following raw materials in parts by weight: 20-30 parts of water, 20-30 parts of water, 20-30 parts of water, 20-30 parts of nano calcium carbonate, 20-30 parts of nano calcium carbonate, 20-30 parts of magnesium phosphate cement coated bacteria-loaded porous microspheres, 20-30 parts of a polycarboxylate superplasticizer, 20-30 parts of an organic silicon defoaming agent and 25-35 parts of mixing water. The technical-economic cooperation requirement of building 3D printing under complex working conditions is met, and various indexes of phosphate modified calcium aluminate cement applied to the 3D printing technology are met.

The invention relates to the technical field of alloy materials, and discloses a preparation method of a nano WC-Co hard alloy for micro drilling, the nano WC-Co hard alloy comprises the following raw materials by weight: 83-92 wt% of nano tungsten carbide, 7-17 wt% of ultrafine cobalt oxide powder, 0-1.5 wt% of a hard alloy grain growth inhibitor, and 0.2-3 wt% of a forming agent; the method comprises the following steps: 1, mixing nano tungsten carbide, superfine cobalt oxide powder, vanadium carbide and a forming agent, and adjusting a carbon balance point in the powder to be mixed by using free carbon black; 2, sequentially putting the powder and a forming agent into a ball mill, and mixing the materials by taking absolute ethyl alcohol as a ball milling medium; the superfine cobalt oxide powder is used for replacing superfine cobalt powder, so that the extension area of cobalt element powder is increased, the problem that the cobalt powder is extended into a sheet shape is avoided, the cobalt pool phenomenon is effectively reduced, meanwhile, crystal grain growth inhibition carbides are increased, the phenomenon that a binding phase in hard alloy is not uniform is avoided, the service life of the finished micro-small-diameter drill bit special for the PCB is guaranteed, and the service life of the finished micro-small-diameter drill bit special for the PCB is prolonged. And the product quality is further improved.

The invention discloses a multi-layer plating process for optimizing surface characteristics of a base material, which is characterized by comprising the following steps of: pretreating the surface of a plated base material, improving the surface smoothness of the base material, and removing dirt on the surface of the base material; electroplating the base material by using the nickel pre-plating solution; chemical plating: the base material subjected to pre-plating treatment is placed in a chemical composite plating solution for chemical plating; the chemical composite plating solution comprises a basic plating solution and second-phase particles, the second-phase particles are nano niobium carbide, and the second-phase particles are wrapped and embedded into an alloy plating layer in the chemical plating process, so that the second-phase particles are distributed in plating layer matrix metal in a discrete mode to form a discontinuous phase. The hard particles niobium carbide are added and are dispersed and distributed in a coating substrate (Ni-P alloy), the hard particles can effectively refine the substrate metal, so that the hardness of the substrate metal is improved, and the niobium carbide hard phase particles are high in hardness, excellent in wear resistance, large in yield limit and high in pressure resistance.

The invention discloses a rare earth modified tungsten carbide alloy and a preparation method thereof, and belongs to the technical field of tungsten carbide alloys. The rare earth modified tungsten carbide alloy comprises 80 wt.%-90 wt.% of a hard phase and 10 wt.%-20 wt.% of a matrix, and the hard phase is uniformly distributed in the matrix; the hard phase comprises a rare earth modified tungsten carbide inner core, the rare earth modified tungsten carbide inner core is coated with a nano tungsten carbide shell, the rare earth modified tungsten carbide inner core accounts for 85-95 wt.% of the mass of the hard phase, and the nano tungsten carbide shell accounts for 5-15 wt.% of the mass of the hard phase. By the adoption of the rare earth modified tungsten carbide alloy and the preparation method thereof, the problem that an existing tungsten carbide alloy is poor in hardness and abrasion resistance can be solved, and the toughness of the tungsten carbide alloy can be improved.

The invention discloses an ablation-resistant long-fiber reinforced nylon material for a battery pack, and relates to the technical field of nylon materials, the ablation-resistant long-fiber reinforced nylon material comprises the following raw material components by weight: 60-80 parts of nylon resin powder, 30-50 parts of a long-fiber reinforced material, 10-18 parts of aluminum diethylhypophosphite master batch, 8-15 parts of bromine-antimony composite master batch, 3-7 parts of montmorillonite, 12-20 parts of aluminum hydroxide, and 2-6 parts of nano-silica. The composite material is prepared from the following components in parts by weight: 1-4 parts of carbon nanotubes, 0.5-1.2 parts of an antioxidant I, 0.3-0.8 part of a lubricant I, 2-5 parts of a compatilizer, 0.1-0.4 part of a nucleating agent and 0.2-0.6 part of an anti-ultraviolet agent. By adding the diethyl aluminum hypophosphite master batch, the flame retardant property of the nylon material is improved, the processability of the nylon material is improved, the ablation resistance of the nylon material is improved, and the problems of insufficient flame retardant property, poor processability and poor ablation resistance of the nylon material can be solved.

The invention belongs to the technical field of transmission sheet materials, and aims to solve the problems that the service life of a clutch is affected and even potential safety hazards are caused due to poor comprehensive performance of an existing transmission sheet material for the clutch under the working conditions of high temperature, high stress and the like. In order to achieve the purpose, the invention provides a powder metallurgy transmission sheet material for a clutch and a preparation method of the powder metallurgy transmission sheet material. The powder metallurgy transmission sheet material for the clutch comprises, by mass, 55%-65% of high-purity atomized iron powder, 8%-12% of electrolytic copper powder, 4%-8% of hydroxyl nickel powder, 1.5%-4% of ferromolybdenum powder, 1%-3% of chromium powder, 0.3%-1.5% of lanthanum powder, 1.5%-3.5% of nanometer silicon carbide particles, 0.8%-2% of carbon fibers, 0.5%-1.5% of whisker-shaped aluminum oxide, 0.3%-1% of cellulose nanocrystals, 0.5%-2% of rare earth oxide, 2.3%-6% of a lubricating agent and 0.5%-1.8% of a binding agent. The comprehensive performance of the transmission piece for the clutch is greatly improved, the reliability and durability of the transmission piece in a complex mechanical environment are guaranteed, the service life is prolonged, and the safety risk is reduced.

The invention relates to the technical field of polypropylene materials, in particular to a self-cleaning and scratch-resistant composite PP material and a preparation method thereof.The composite PP material is prepared from, by weight, 55-75 parts of polypropylene resin, 4-10 parts of filler, 1-3 parts of scratch-resistant agent, 5-10 parts of compatilizer, 1-5 parts of surfactant, 0.1-0.5 part of antioxidant and 0.7-1.5 parts of lubricant; the scratch-resistant agent is silicone powder; the filler is a micron-sized filler and a nano-sized filler, the micron-sized filler is one or two of barium sulfate and calcium sulfate, and the nano-sized filler is modified nano silicon carbide or a mixture of modified nano silicon carbide and hydrophobic modified gas-phase nano silicon dioxide; the modified nano silicon carbide is characterized in that the surface of nano silicon carbide is modified through a silane coupling agent; the self-cleaning composite PP material has the advantage that the scratch resistance of the self-cleaning composite PP material is improved.

The invention relates to the field of cables, and discloses a modified polyvinyl chloride composite material for cables and a preparation method thereof.The composite material comprises low-density polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, nitrile rubber, modified graphene oxide, modified nano calcium carbonate and auxiliaries; the modified graphene oxide is prepared by reacting acylating chlorination of graphene oxide with an anti-aging derivative, the anti-aging derivative is prepared by reducing a benzoxazole-containing intermediate generated by a reaction of 2-amino-4-bromophenol and 4-cyanobenzaldehyde to obtain an aminated benzoxazole-containing intermediate, then the aminated benzoxazole-containing intermediate reacts with p-phenylenediamine, and then the product reacts with 3-(3, 4-dichlorophenyl)-1, 2, 3-triazole-3-one to obtain the anti-aging graphene oxide. 2, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride is subjected to a reaction to prepare the product. And the modified nano calcium carbonate is prepared by reacting phosphonitrilic chloride trimer with an amino silane coupling agent and 2-amino benzoxazole-5-borate and then grafting on the surface of the nano calcium carbonate. The composite material prepared by the invention has excellent flame retardance, heat resistance and long-acting oxidation resistance.

The invention relates to an environment-friendly low-carbon magnesia carbon brick and a preparation method thereof, and the environment-friendly low-carbon magnesia carbon brick comprises the following components in parts by weight: 70-85 parts of fused magnesia aggregate, 25-35 parts of magnesia powder, 3-5 parts of a composite antioxidant, 0.5-1 part of nano carbon black and 2-4 parts of nano carbon fiber. The nano carbon fiber is adopted as a binding agent, so that the strength and toughness of the magnesia carbon brick can be improved, the erosion resistance and thermal shock resistance of the magnesia carbon brick can be enhanced, and the magnesia carbon brick does not generate harmful gas to pollute the environment during heating and is environment-friendly. The nano carbon black can construct a continuous carbon network structure with relatively low carbon content and can be tightly combined with other raw materials in a magnesia carbon brick matrix to prevent the matrix from being wetted by slag, so that the erosion resistance of the magnesia carbon brick is improved, the carbon-containing resin powder can be softened in a high-temperature state, pores in the matrix are closed in the softening process, and the corrosion resistance of the magnesia carbon brick is improved. The compactness of the magnesia carbon brick is improved, and the strength, the high-temperature breaking strength and the erosion resistance of the magnesia carbon brick are further improved.

The invention discloses polyelectrolyte carbon-based hydrogel as well as a preparation method and application thereof. The polyelectrolyte carbon-based hydrogel has an ordered orientation three-dimensional porous network structure formed by crosslinking of water-soluble gel, polyelectrolyte and nanocarbon. The preparation method comprises the following steps: uniformly mixing water-soluble gel, water and a nano carbon material to obtain a first mixed solution; uniformly mixing polyelectrolyte with the first mixed solution to obtain a second mixed solution, and adjusting the pH value; mixing the second mixed solution and a cross-linking agent, and performing directional freezing casting to obtain frozen nano composite gel; and performing freeze drying on the frozen nano carbon composite gel to obtain polyelectrolyte carbon-based aerogel, and soaking the polyelectrolyte carbon-based aerogel in water to obtain the polyelectrolyte carbon-based hydrogel. The porous structure of the hydrogel is effectively regulated and controlled in the directional freezing casting process through the polyelectrolyte, and the polyelectrolyte carbon-based hydrogel has a small-pore hierarchical pore structure, has high photo-thermal conversion and light absorption capacity and can be applied to the field of photo-thermal water evaporation purification.

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention discloses a high-temperature-resistant perfluoroether rubber preparation method which comprises the following steps: mixing perfluoroether rubber, modified silicon carbide and modified boron nitride nanosheets, adding a cross-linking agent, uniformly mixing, and carrying out segmented vulcanization to obtain the high-temperature-resistant perfluoroether rubber, wherein in the preparation process of the modified boron nitride nanosheet, nano silicon carbide, the boron nitride nanosheet, polymethyl methacrylate, a catalyst and a solvent are uniformly mixed, the surface of a matrix is coated with the mixture, a thin film is formed through drying, the thin film is sintered and crushed, and an intermediate is obtained; and carrying out graft modification on the intermediate by using a silane coupling agent containing a carbon-carbon double bond to obtain the modified boron nitride nanosheet. The perfluoroether rubber prepared by the invention has good thermal conductivity, high temperature resistance and plasma resistance.

The invention discloses a sodium-ion battery pole piece containing composite nano silicon carbide and a preparation method thereof, and relates to the field of sodium-ion battery pole pieces, the sodium-ion battery pole piece containing composite nano silicon carbide comprises 0.5-5Wt% of nano silicon carbide particles and 0.5-5Wt% of silicon carbide whiskers, and the weight percentage of the nano silicon carbide particles is 0.5-5Wt%; the weight ratio of the nano silicon carbide particles to the silicon carbide whiskers is (1-2): 1. The silicon carbide is added to enhance the thermal conductivity, so that the thermal conductivity of the sodium-ion battery pole piece is enhanced, and the sodium-ion battery is prevented from aging at high temperature.

The invention relates to the technical field of reverse osmosis membrane supports, in particular to a polyester non-woven fabric and a preparation method and application thereof.The preparation method comprises the steps that S1, polyester main body fibers and polyester adhesive fibers are used as raw materials to prepare high-quantitation original cloth M0 and low-quantitation original cloth H0; carrying out hot pressing pretreatment on the H0 to obtain a product H0 '; s2, overlapping and hot-pressing M0 and H0 'to obtain a composite non-woven fabric M1H1; s3, the M1H1 is impregnated with a functional solution, and the functional solution contains para-aramid nanofibers and nano calcium carbonate modified by hexadecyl trimethyl ammonium bromide; and then carrying out cold pressing on the composite non-woven fabric impregnated with the functional solution to obtain the nano-material modified composite non-woven fabric. And S4, carrying out secondary hot pressing treatment to obtain the polyester non-woven fabric. The polyester non-woven fabric can effectively avoid the problems of excessive curling, excessive permeation of a polysulfone solution and the like during curing after being coated with polysulfone, and is more beneficial to application in a reverse osmosis membrane.

The invention relates to the technical field of nano materials, and particularly discloses a preparation method of surface modified nano calcium carbonate for a battery diaphragm coating. According to the method, the technical paths of microemulsion confinement crystal form regulation and control, gradient surface modification and boehmite compounding and porosity regulation and control are fused, and the functional nano calcium carbonate adaptive to the battery diaphragm coating is prepared. According to the technical scheme, limestone is used as a raw material, after calcination and digestion, the particle size of nano calcium carbonate is controlled through microemulsion carbonization (a cyclohexane-span 80-n-butyl alcohol system); a silane coupling agent KH560-KH570 is adopted for gradient modification to introduce an electrophilic functional group, boehmite is compounded to form a composite coating, and the porosity is regulated and controlled by adjusting the solid content in coating slurry and the coating speed. The method is stable in process and high in compatibility, and meets the requirements of diaphragm coatings of lithium ion batteries and solid-state batteries.

The invention relates to the technical field of fireproof materials, and discloses a flame retardant for fireproof paint and a preparation method of the flame retardant. The flame retardant is prepared from modified aluminum polyphosphate, a borate-phosphate composite acid source, a silica modified carbon forming agent, chitosan modified nano carbon, melamine cyanurate, bicarbonate, graphene oxide, nano titanium dioxide and an interface reinforcing agent. Through the multi-stage catalysis of the composite acid source, the efficient charring of the modified charring agent, the multi-stage gas source release and the synergistic effect of the nano additive, a compact and uniform expansion layer is formed, and the high-temperature stability, the heat insulation performance and the thickness retention rate in a dynamic environment of the expansion layer are remarkably improved. According to the preparation method, by optimizing the steps of mixing, dispersing, drying and curing the components, the high-efficiency exertion of the performance of the flame retardant is ensured. The flame retardant is widely applicable to fireproof coatings for buildings, steel structures, wood and the like, has the characteristics of high expansion efficiency, lasting heat insulation and excellent mechanical properties, and effectively overcomes the defects in the prior art.

The invention relates to the technical field of wear-resistant materials, in particular to a nano wear-resistant composite material and a preparation method and application thereof, and the nano wear-resistant composite material comprises the following raw materials in parts by weight: 45-50 parts of nano tungsten carbide, 10-15 parts of cobalt powder, 7-11 parts of a modified nano titanium nitride agent, 5-7 parts of nano neodymium oxide, and 4-6 parts of a nano TaC-doped complexing agent. According to the nano wear-resistant composite material, the nano tungsten carbide is matched with the cobalt powder and the nano neodymium oxide, the modified nano titanium nitride agent, the doped nano TaC and the synergist are coordinated and matched, and the raw materials are coordinated and synergistic, so that the wear resistance, the yield strength performance and the fatigue resistance of the obtained nano wear-resistant composite material are coordinated and improved; meanwhile, the product is excellent in performance stability under different degrees of salt corrosion conditions.

The invention discloses a high-crack-resistance self-repairing sprayed concrete composition as well as a preparation method and application thereof. The composition comprises the following components in percentage by mass: 40%-50% of cement, 50%-60% of aggregate, 1%-2% of composite microfibers, 3%-5% of modified polymer emulsion, 1%-2% of an additive, 0.5%-1.5% of a nano reinforced phase and 2%-3% of a self-repairing microcapsule, and also comprises an anti-corrosion additive. The composite microfiber is a mixture of polypropylene and basalt microfiber, and the nano reinforced phase is a compound system of nano calcium carbonate and silicon dioxide. The preparation method comprises the steps of aggregate pretreatment, dry material mixing, wet material preparation, microcapsule introduction and injection molding, the aggregate is pretreated through a silane coupling agent, the cement is formed by compounding ordinary Portland cement and aluminate cement, and the modified polymer emulsion is modified through a siloxane monomer. According to the composition, through the synergistic effect of the composite microfibers, the self-repairing microcapsules and the nano reinforced phase, the crack resistance and the self-repairing capacity are improved, the composition is particularly suitable for a corrosive environment, and the service life of a structure can be prolonged.

The invention discloses a preparation process of a sintering kiln silicon carbide guide roller with thermal shock resistance and high-temperature corrosion resistance. The process comprises the following steps: sequentially carrying out surface pretreatment such as reticulate pattern laser engraving, sand blasting and cleaning and drying on a silicon carbide guide roller substrate; performing plasma spraying on a pure aluminum oxide coating after preheating; carrying out segmented laser remelting on the coating to improve the compactness; and finally, coating the nano silicon carbide slurry, calcining and curing. The thermal shock resistance and the high-temperature corrosion resistance of the guide roller are remarkably improved by enhancing the binding force of the coating through laser engraving, optimizing the density of the coating through laser remelting and combining post-treatment of nano silicon carbide slurry, and the service life of the guide roller in a lithium battery positive electrode material sintering kiln is prolonged.

The invention discloses a magnetic control silicon-based adhesive as well as a preparation method and application thereof. The magnetic control silicon-based adhesive is prepared from the following components in parts by weight: 60 to 70 parts of silane modified polyurethane, 15 to 25 parts of a silane coupling agent, 40 to 60 parts of a magnetic nano material, 15 to 45 parts of microcrystalline silicon, 25 to 40 parts of nano calcium carbonate, 5 to 15 parts of titanium dioxide, 5 to 10 parts of talcum powder, 10 to 15 parts of amino silane, 3 to 8 parts of color paste and 1 to 4 parts of a catalyst. The silane modified polyurethane, the magnetic nano material and the microcrystalline silicon are reasonably compounded, so that the obtained adhesive not only has good adhesive force, but also has excellent water resistance and aging resistance, the introduction of the magnetic nano material not only can be matched with electromagnetic equipment to realize remote repair, but also can improve the curing capacity of the adhesive, so that the adhesive has a good application prospect. And the microcrystalline silicon enables the chemical properties of the adhesive to be more stable, and can meet the building repair requirements in various complex environments.

The invention relates to the technical field of flour waterproof packaging bags, in particular to a wear-resistant waterproof packaging bag for flour processing and production. An outer layer material of the packaging bag comprises the following raw materials in parts by mass: 75-85 parts of polyamide, 15-25 parts of a thermoplastic elastomer, 2-5 parts of nano calcium carbonate, 0.2-0.25 part of an antioxidant, 1-3 parts of a nucleating agent and 5-10 parts of a citrate plasticizer; the middle layer material of the packaging bag comprises the following raw materials in parts by mass: 55-65 parts of a polyamide monomer, 35-45 parts of a polyether monomer and 0.5-1.5 parts of a catalyst; the inner layer of the packaging bag is made of 100 parts of food-grade low-density polyethylene. According to the flour packaging bag, by optimizing the material formula and the preparation technology, balance of flexibility and rigidity is achieved, abrasion resistance and water resistance are remarkably enhanced, aging resistance stability is improved, accurate technology guarantee performance is achieved, efficient bonding and antistatic design are achieved, flour quality and transportation safety are guaranteed, and potential risks are reduced.

The invention discloses a zero-silicon artificial board and a manufacturing process thereof. The zero-silicon artificial board is prepared by mixing the following components: modified powder, modified unsaturated polyester resin, a flexibilizer, white slurry, a curing agent and a coupling agent. Wherein nano calcium carbonate is subjected to surface chemical coating modification to obtain the modified powder, and the surface of the modified powder is provided with a high polymer layer. The modified unsaturated polyester resin is obtained by modifying unsaturated polyester resin with styrene. The weight ratio of the modified powder to the modified unsaturated polyester resin to the flexibilizer is (16-30): (6-10): 1, and the white slurry, the curing agent and the coupling agent account for 3.5%-5.8% of the total weight. The crystal-free silicon plate with good gloss and light transmission and excellent impact resistance can be manufactured, the modified powder is adopted as the filler to replace aluminum powder, the stone texture is better, the source is wide, and the manufacturing cost is reduced.