936 results about "Nanostructured carbon" patented technology

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 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 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.

A composite, comprising a binder, the binder comprising one or more of polymeric, metallic, or ceramic, or pyrolytic carbon binder and a nanostructured carbon having a cellular structure. The cellular structure comprises one or more cell walls having a structure formed by a template and one or more cavities. Each cavity is substantially enclosed by the one or more cell walls and substantially unimpregnated by a liquid or solid.

The invention relates to a nano silicon carbide whisker and a preparation method thereof, and the preparation method comprises the following steps: (1) carrying out acid process treatment on fly ash by using an acid solution, so that the content of key impurity elements in the fly ash accounts for 2-11% of the total mass of the treated fly ash, and obtaining acid-treated fly ash; (2) mixing the acid-treated fly ash with a first carbon source to obtain a mixture; and (3) covering the mixture with a second carbon source, roasting in a reducing atmosphere to obtain a roasted material which comprises a nano silicon carbide whisker layer and a total impurity layer positioned below the silicon carbide whisker layer, and removing the total impurity layer to obtain the nano silicon carbide whisker. According to the preparation method, the low-cost fly ash is taken as a raw material, the advantages of low preparation cost and relatively high product yield can be taken into account through the synergistic effect of moderate acid treatment, raw material position setting and roasting in the reducing atmosphere, and good morphology and relatively high purity of the nano silicon carbide crystal whiskers are ensured.

The invention belongs to the technical field of waterproof and drainage boards, and provides a waterproof and drainage board with high compressive strength and tensile strength and a preparation method and application thereof.The waterproof and drainage board is formed by compounding an upper layer, a middle layer and a lower layer, and the upper layer and the lower layer are each prepared from 30-40 parts of high-density polyethylene, 10-20 parts of chlorinated polypropylene, 10-15 parts of metallocene polyethylene and 1-3 parts of carbon nanotubes; 2-5 parts of nano calcium carbonate, 1-5 parts of polyethylene wax, 1-3 parts of an antioxidant and 1-3 parts of an anti-ultraviolet agent; the middle layer is prepared from the following raw materials: 35 to 55 parts of linear low-density polyethylene, 15 to 30 parts of metallocene polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of POE (Polyolefin Elastomer), 5 to 10 parts of aramid chopped fiber, 1 to 3 parts of antioxidant and 1 to 3 parts of ultraviolet screening agent; the nano calcium carbonate is subjected to modification treatment. The waterproof and drainage board has relatively high compressive strength and tensile strength, and has a good application prospect.

The invention provides a high-sealing-performance flame-retardant composite film and a preparation method thereof, and belongs to the technical field of composite film material preparation, the high-sealing-performance flame-retardant composite film comprises an outer layer, a middle layer, a transition layer and an inner sealing layer which are sequentially stacked, the material of the middle layer comprises a polypropylene matrix, modified aluminum hydroxide and zinc borate, the material of the transition layer comprises epoxy resin and nano silicon carbide, and the material of the inner sealing layer comprises ethylene-vinyl acetate copolymer and maleic anhydride grafted polyethylene; the flame-retardant PET also contains 12 to 20 weight percent of phosphorus-nitrogen synergistic flame retardant; the outer layer and the middle layer are combined in a physical entanglement mode, and the transition layer and the inner sealing layer are combined in a chemical crosslinking mode. The high-sealing-performance flame-retardant composite film provided by the invention has excellent flame-retardant performance and sealing performance, and is suitable for packaging of new energy automobile batteries and high-end electronic equipment.

The invention belongs to the technical field of ferrous metallurgy and high-strength wear-resistant materials, and discloses large-thickness high-toughness NM550 wear-resistant steel and a preparation method thereof. Nb, Ti and V are cooperated according to the mass ratio of 1: 1: 2 to form a multi-element nano carbide (Nb, Ti, V) C main strengthening phase with the average particle size of 5-50 nm; in the controlled rolling and austenitizing stages, Cr and Mo elements form fine carbides, a main strengthening phase is induced to be separated out preferentially, and cluster aggregation is prevented; al initial deoxidation and Ce and Ca composite denaturation treatment are adopted to form spherical Ce-Ca-Al-O composite oxide inclusions, and the average particle size is smaller than or equal to 2 microns. By adopting clean smelting, uniform-temperature heating, temperature-controlled rolling, three-stage flow-regulating water cooling and two-stage tempering treatment, uniform regulation and control and multi-scale strengthening of the structure are realized. The yield strength is greater than or equal to 1400 MPa, the tensile strength is greater than or equal to 1850 MPa, the ductility is greater than or equal to 15%, the ballistic work at-20 DEG C is greater than or equal to 40 J, and the surface hardness is greater than

The invention discloses cinnamyl aldehyde at nano calcium carbonate / chitosan hydrogel. The hydrogel comprises a hydrogel matrix formed by cross-linking nano calcium carbonate and chitosan, and cinnamyl aldehyde loaded on the hydrogel matrix. The hydrogel system which is loaded with traditional Chinese medicine components and intelligently controls effective release of the traditional Chinese medicine components is prepared by utilizing the mutual adsorption effect of cinnamyl aldehyde and nano calcium carbonate. The hydrogel has excellent antibacterial activity and a function of accelerating wound healing, and the effect of the hydrogel is obviously superior to that of common calcium carbonate / chitosan hydrogel. A new direction is provided for application of the cinnamyl aldehyde and nano calcium carbonate / chitosan nano system, and a new strategy is provided for designing advanced functional materials modified by traditional Chinese medicine ingredients.

The invention provides a microbial agent compound fertilizer for sandy land and a preparation method thereof, and relates to the technical field of compound fertilizers. The invention relates to a microbial inoculum compound fertilizer for sandy land. The soil conditioner is prepared from the following raw materials in parts by mass: 40 to 60 parts of compost, 0.3 to 0.8 part of nitrogen-fixing bacteria, 0.3 to 0.8 part of phosphate solubilizing bacteria, 0.3 to 0.8 part of potassium bacteria, 8 to 12 parts of charcoal, 8 to 12 parts of zeolite, 9 to 13 parts of perlite, 4 to 6 parts of vermiculite, 1 to 3 parts of seaweed extract, 2 to 4 parts of humic acid, 1 to 7 parts of waste cellulose nanocrystals, 30 to 40 parts of insect debris, 0.3 to 3 parts of nano carbon dots, 3 to 9 parts of lime and 8 to 15 parts of wood fiber. The compound fertilizer disclosed by the invention not only is rich in various necessary nutrient elements, but also has a good slow release effect and a good soil improvement function, can effectively improve soil fertility and promote plant growth through the action of various biological strains, and also has the characteristics of environmental protection and no pollution by utilizing the waste cellulose nanocrystals and the insect remains.

The invention belongs to the technical field of kitchen ware coatings, and discloses a preparation method of a wear-resistant coating based on nano structure optimization, through a specific ratio of nano silicon carbide, titanium dioxide, boron nitride and silver, four particles form a complementary and synergistic functional system-silicon carbide provides a hardness basis, boron nitride optimizes the antifriction performance by means of a layered structure, and the wear-resistant coating is prepared. Titanium dioxide enhances the chemical stability; by matching with a composite dispersion process of high-energy ball milling and ultrasonic treatment, particle aggregation is broken, so that the coating forms a uniform and compact nano-structure, the structure can effectively disperse friction stress, the wear resistance is remarkably improved, and the service life of the kitchen ware in a high-frequency cooking friction environment is greatly prolonged; a kitchen ware substrate is subjected to 80-mesh white corundum sand blasting to form a rough surface, then impurities are removed through ultrasonic cleaning, and a good interface condition is created for coating adhesion; and a subsequent stepped vacuum curing process promotes chemical bonding of the nanoparticles and the polyimide resin, and the binding force of the interior of the coating and the binding force of the coating and the substrate are enhanced.

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

The invention discloses an additive manufacturing method for in-situ regulation and control of a TiB / TiC titanium-based heterostructure through laser deposition, and belongs to the technical field of composite material preparation. According to the method, laser path planning is carried out based on three-dimensional modeling and layered slicing; the preparation method comprises the following steps: ball-milling and mixing titanium alloy powder, nano boron carbide powder and trace rare earth powder according to a specific proportion, and carrying out vacuum drying; and addition of trace rare earth is beneficial to grain refinement and improvement of reinforcement phase distribution and interface bonding. Under the action of a high-energy laser beam, the mixed powder is fused in an argon protective atmosphere, an in-situ reaction is carried out at the same time, and TiB and TiC reinforced phases are generated; the gradient component design can be implemented in the laser deposition process, specifically, the powder feeding proportion of B4C powder is dynamically controlled through a program, the gradient of the B4C powder is increased from the bottom layer to the surface layer in the direction perpendicular to the substrate, and therefore the gradient heterostructure with the enhanced phase content and performance gradually changed is formed. According to the method, the problems of non-uniform reinforcement phase distribution, obdurability mismatch, plasticity loss and the like in a traditional method are solved, the prepared composite material or gradient component has high strength (the tensile strength reaches 987.66 MPa) and good plasticity and toughness matching, no crack defect exists, and the method is suitable for manufacturing of high-performance parts in the fields of aerospace and high-end machine manufacturing.

The invention discloses a fiber composite material based on hydrogen bond self-repairing and conductive self-diagnosis and a preparation method of the fiber composite material, and belongs to the technical field of intelligent diagnosis and self-repairing fiber reinforced resin-based composite materials and preparation of the intelligent diagnosis and self-repairing fiber reinforced resin-based composite materials. According to the method, the problem that the self-healing effect cannot be timely obtained on the internal damage of the material due to the fact that the damage area cannot be accurately positioned and identified before the damage of the existing fiber composite material is repaired is solved. According to the invention, a quantum tunnel effect and a three-dimensional conductive skeleton are constructed by using a micro-nano multi-stage conductive filler composed of a nano carbon nanotube, micron flake graphite powder and unidirectional short carbon fiber, a damage occurrence position is realized based on an electro-mechanical corresponding relation, a self-sensing function is given, and accurate positioning of the damage is realized (the error is less than 1mm). A multiple reversible hydrogen bond system formed by acrylamide, polyethyleneimine and epoxy resin is further utilized, the self-repairing effect of the composite fiber material is achieved, and the test result shows that the self-repairing efficiency of at least 90% or above is achieved at the normal temperature.

An optically active nanocomposite material is provided that may have a textured substrate and a multilayer optic stack with a plurality of layers comprising nanoplatelets. The nanoplatelets may be achiral and formed of a material such as transition metal chalcogenides, Mxenes, or nanocarbons. The optically active nanocomposite material displays both linear birefringence (LB) and linear dichroism (LD) and optional circular dichroism (CD). The nanocomposite may have an optical asymmetry g-factor of greater than or equal to about 1. Further, the nanocomposite is thermally stable, for example, to a temperature of greater than or equal to about 250° C. Different methods of fabricating such nanocomposites using layer-by-layer (LBL) processes are also provided.

The invention discloses a high-performance coiled material powder coating and a preparation method thereof, and belongs to the technical field of powder paints.The high-performance coiled material powder coating has the advantages that organosilicon modified epoxy resin and carboxyl-terminated polyester resin are compounded, a-Si-O-Si-chain segment is introduced into a system after organosilicon modification, the flexibility is high, and the high-performance coiled material powder coating has a synergistic effect with nano calcium carbonate; the adhesive force and the flexibility of the coating are balanced, and the mechanical strength of the coating can be obviously improved by adding the grafted modified graphene oxide and the active chromic oxide; then, phosphite ester groups are grafted to the graphene oxide, the graphene oxide is applied to a powder coating system, a three-dimensional network structure and chemical bonding can be formed in the system, the crosslinking stability of the graphene oxide in the system can be improved, and a certain barrier property can be achieved due to the flaky structure of the graphene oxide; and the coating is endowed with long-acting weather resistance, and the weather resistance and the corrosion resistance of the coating are further improved through the synergistic effect with the active chromic oxide.

The application relates to a UHPC material for a bridge expansion joint and a preparation method thereof, and comprises the following steps: S2, nanometer carbon fibers are stirred with residual silica fume in a premixing bin at high speed for 2 minutes, so that the silica fume wraps the nanometer carbon fibers and prevents electrostatic agglomeration; after premixing, the mixed powder is sequentially sent into a vortex chamber and an ultrasonic atomization cavity through compressed airflow, and the fiber flows through a piezoelectric ceramic array high-frequency vibration to make the fiber bundle dissociate into a single state; S3, the atomized fiber aerosol passes through a porous diffuser and is sprayed into a planetary mixer through a second feeding port at a certain angle to participate in the mixing in step S1; and S4, steel fibers are sent into a vibrating screening box, and the adhered steel fiber groups are separated through high-frequency vibration, and the separated steel fibers enter the planetary mixer through a third feeding port to participate in the mixing in step S1. The steel fibers and the nanometer carbon fibers uniformly distributed in the UHPC material form a double anti-cracking mechanism, and the impact toughness of the UHPC material is improved.

The invention provides a preparation method for dynamically preparing a doped and coated lithium iron phosphate positive electrode material by a one-step method and the positive electrode material. A lithium source, an iron source, a phosphorus source, an aluminum source, a titanium source, other optional doping agents, a coating agent and an optional dispersing agent are mixed through a one-step method, spray drying and dynamic sintering are carried out, presintering and high-temperature sintering are adopted in dynamic sintering, and carbon thermal reduction and carbon coating are synchronously completed. According to the doped and coated lithium iron phosphate positive electrode material disclosed by the invention, the lattice structure is optimized through Al / Ti co-doping, and the conductivity of the material and the lithium ion diffusion rate are remarkably improved by combining with a continuous nano carbon layer generated by splitting decomposition of a carbon source. According to the technology, the problem of non-uniform heat transfer of traditional static sintering is abandoned, and an efficient and low-cost solution is provided for industrial production of high-performance lithium iron phosphate.

The invention discloses a three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material as well as a preparation method and application of the three-dimensional bio-based hierarchical pore nanocarbon water photovoltaic power generation material. The specific technical scheme of the preparation method comprises the following steps: firstly, preparing an acetic acid solution containing chitosan, glucose and borax, and standing the solution at room temperature for 24 hours; then, freeze-drying the precursor solution, and pre-carbonizing xerogel in a drying oven for a certain time; and finally, adding a certain amount of water into the pre-carbonized dry gel, putting the pre-carbonized dry gel into a reaction kettle with a polytetrafluoroethylene lining, reacting for a certain time at a certain temperature, dialyzing the obtained wet gel, and drying at normal temperature and normal pressure to prepare the nano carbon aerogel with the hierarchical pore structure. The nano carbon aerogel has good hydrophilicity, abundant surface charges and a hierarchical pore structure, and is a low-cost and excellent water evaporation induced power generation material.

The invention belongs to the technical field of environment-friendly materials, and particularly relates to a bamboo-based composite material and a preparation method thereof.The bamboo-based composite material is composed of a biodegradable resin matrix, multi-scale bamboo fiber filler and the like, and the core of the bamboo-based composite material is that micron, submicron and nanometer three-level bamboo fibers are adopted to construct a multi-scale reinforced network, and a nanometer carbon reinforced phase material is adopted for assistance; through a reaction type interface modifier system containing a maleic anhydride grafted polymer and the like, strong chemical bonding of fibers and a resin matrix is achieved, interface compatibility is remarkably improved, the material selects PBS, PBAT, PLA and other matrixes, a plasticizer and a functional auxiliary are combined, excellent biodegradability is kept, meanwhile, high mechanical strength and good processing performance are achieved, and the material is suitable for industrial production. The composite material is an ideal green and environment-friendly material, the material still keeps excellent mechanical properties when the total amount of the bamboo fibers reaches 60 parts through the synergistic effect of the three-scale fibers, and the tensile strength can reach 50 MPa to 65 MPa and is improved by 180% or above under the same filling amount compared with the prior art.

The invention discloses a double-plate high-performance nanocarbon dry clutch, and relates to the technical field of vehicle clutches. The double-plate high-performance nanocarbon dry clutch comprises a flywheel disc, a clutch shell is fixedly connected to the front face of the flywheel disc, an action sliding sleeve is rotationally connected to the front face of the clutch shell, an output sliding shaft is rotationally connected to the action sliding sleeve through a bearing, and the clutch disc is slidably connected to the back face of the output sliding shaft; the back face of the flywheel disc is rotationally connected with a press-fit stabilizing mechanism, and the front face of the press-fit stabilizing mechanism is fixedly connected with a cooling dredging mechanism. According to the double-plate high-performance nanocarbon dry clutch, by arranging the press fit stabilizing mechanism, the cooling dredging mechanism and the heat insulation and heat preservation mechanism, the pressure between the flywheel and the clutch disc is increased, indirect adsorption is conducted on the clutch disc, the contact area between the clutch disc and the surface of the flywheel disc is maintained, and the heat dissipation effect and the transmission stability of the clutch are improved.

The application discloses an anti-edge curling nursing pad and a processing technology, and relates to the field of layered products. The nursing pad comprises, from top to bottom, a surface non-woven fabric, an absorbent core, a bottom PE film, and a composite elastic frame between the edges of the surface non-woven fabric and the bottom PE film. The cross section of the composite elastic frame is a shape of a hook, and the inward width is 20-50 mm. The composite elastic frame is made of a blend comprising the following components: 55-65% low-density polyethylene, 25-35% thermoplastic polyurethane, 5-10% nano calcium carbonate, and 1-3% antioxidant. By constructing a composite elastic frame at the composite edges of the surface and the bottom, a rigid skeleton and an elastic buffer structure are constructed by using the blend system of low-density polyethylene and thermoplastic polyurethane, so that the problem of poor elasticity and easy plastic deformation of the traditional single PE film is effectively solved, and the anti-curling ability and long-term use stability of the edge of the nursing pad are significantly improved.

The application discloses a low-carbon magnesia carbon brick and a preparation method thereof, and relates to the technical field of weather-resistant magnesia carbon bricks. The low-carbon magnesia carbon brick comprises the following components in parts by mass: fused magnesia particles 80-90 parts, fused magnesia fine powder 15-25 parts, flake graphite 5-10 parts, nano carbon powder 1-5 parts, phenolic resin 10-20 parts, curing agent 0.2-1.5 parts, antioxidant 0.5-3 parts, and modifier 0-8 parts. The core lies in a triple synergistic protection mechanism of the antioxidant, which comprises the electron delocalization of a conjugated pi bond system to stabilize free radicals, the physical isolation of a tert-butyl group, and the formation of a high-temperature barrier layer of a silane group. This effectively delays the oxidation loss of graphite, strengthens the resistance to slag penetration, and improves the service performance of the material under extreme storage conditions.

The invention discloses a high-strength polyethylene film and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a high-strength polyethylene film. The high-density polyethylene composite material comprises the following raw materials in parts by weight: 40-60 parts of high-density polyethylene, 13-25 parts of low-density polyethylene, 5-10 parts of an ethylene-vinyl alcohol copolymer, 10-15 parts of modified nano calcium carbonate, 3-5 parts of modified lignin fibers, 0.5-1 part of an antioxidant 1010, 0.3-0.7 part of a light stabilizer 770, 1-2 parts of zinc stearate and 2-3 parts of maleic anhydride grafted polyethylene. The coating comprises, by weight, 20-30 parts of polyethylene glycol terephthalate, 3-5 parts of poly (butylene adipate-co-butylene terephthalate), 2-4 parts of talcum powder, 1-3 parts of polymethyl methacrylate and 30-45 parts of deionized water. The high-strength polyethylene film is scientific in raw material ratio, and contains various modified components to enhance the performance; the modified nano calcium carbonate and lignin fiber technology is advanced, and compatibility and stability are improved; the preparation method is reasonable, and the film has the characteristics of high strength, good toughness, oxidation resistance, light resistance and the like and is wide in application through two-way stretching and other procedures.

This invention provides nano-tungsten carbide and its preparation method, belonging to the field of nanopowders. The method for preparing nano-tungsten carbide includes the following steps: gaseous tungsten oxide (after vaporization) is passed into an organic solvent to obtain a dispersion of nano-tungsten oxide; the dispersion is mixed with a building agent and dried, allowing the nano-tungsten oxide to enter the interior of carbon nanotubes, resulting in a building material; the building agent includes carbon nanotubes; the building material is then subjected to reduction carbonization to obtain the nano-tungsten carbide. This invention utilizes the high activity of nano-tungsten oxide prepared by sublimation, enabling rapid adsorption into the interior of carbon nanotubes, thereby achieving the preparation of the building material; furthermore, after the nano-tungsten oxide is introduced into the carbon nanotubes, the carbon nanotubes restrict the growth of powder particles during the reduction carbonization process, achieving controllable powder size.

The application discloses a kind of high heat-conducting high endurance low-temperature phase change microcapsule preparation methods, comprising: step 1: using C7, C9 alkane preparation cryogenic phase change material emulsion;Step 2: using melamine resin prepolymer containing polyethylene glycol and hydrophobic silicon carbide powder containing nano silicon carbide preparation modified wall material prepolymer;Step 3: using cryogenic phase change material emulsion and modified wall material prepolymer preparation phase change microcapsule;Step 4: using silver mirror reaction to phase change microcapsule surface silver plating, obtain surface silver plating microcapsule.The low-temperature phase change microcapsule prepared, using C7, C9 low-temperature mixed alkane as microcapsule core material;Using melamine resin as microcapsule wall material, and wall material contains polyethylene glycol modified material, nano silicon carbide modified material to improve the toughness of microcapsule, thermal conductivity;Microcapsule surface silver plating to resist volatility, eliminate residual formaldehyde in wall material.The application solves the problem of low thermal conductivity and poor durability of cryogenic phase change material microcapsule.

The invention discloses a low-cost polyester degradable plastic garbage bag and an extrusion blow molding process thereof. The garbage bag is prepared from a composite material with a specific formula comprising poly (butylene succinate) (PBS), polylactic acid (PLA), surface-modified nano calcium carbonate, a degradation aid, a compatilizer and an anti-blocking agent. The key of the preparation process is as follows: deep drying pretreatment of raw materials; uniform dispersion and compatibility of all the components are realized through high-speed mixing and twin-screw melt blending granulation; a single-screw extrusion film blowing machine provided with an internal cooling (IBC) system is adopted, and stable forming of film bubbles and preparation of an ultrathin film are achieved under the condition that the temperature, the blow-up ratio and the traction speed are accurately controlled. Through collaborative innovation of a material formula and a process, the technical problems that an existing degradable garbage bag is high in cost, insufficient in mechanical property, poor in processing stability, uncontrollable in degradation behavior and the like are successfully solved.

The invention discloses a preparation method of a woven bag, and the preparation method comprises the following steps: nano reinforced phase pretreatment and master batch preparation, woven cloth layer production, functional layer film co-extrusion, multi-layer compounding process, post-treatment and bag making. In the preparation method, modified nano silicon dioxide and nano calcium carbonate are introduced, so that the tensile strength of the woven bag is improved; wherein the surface of the modified nano silicon dioxide is treated by a coupling agent, strong interface bonding is formed between the modified nano silicon dioxide and a polypropylene matrix, and rigid nano particles effectively bear and disperse stress; nano calcium carbonate is dispersed in polypropylene as a rigid filler, molecular chain slippage is hindered, the material rigidity is improved, and meanwhile the impact resistance of the woven bag is improved through reinforcing phase modification and composite structure design.