25results about How to "Increase surface polarity" patented technology

The invention discloses a sulfur-doped carbon-based composite wave-absorbing material as well as a preparation method and application thereof. Sulfonated resin is used as a carbon source, is impregnated with a salt solution of iron, nickel, cobalt and other metals, and then is subjected to high-temperature carbonization in an inert atmosphere, so that the sulfur-doped carbon-based composite wave-absorbing material is prepared. The content of the magnetic components in the composite wave-absorbing material can be adjusted by adjusting the concentration of the metal salt solution, and the electromagnetic wave absorption performance can be further adjusted and controlled in a wide range. The raw material components are stable, the cost is low, and the preparation method is simple and suitable for industrial production; sulfur-containing sulfonated resin is used, after heat treatment, a defect and a functional group introduced by sulfur doping serve as a dipole center, dipole polarization is induced under a high-frequency electromagnetic field, and the dielectric loss capacity of the material can be improved; the composite wave-absorbing material has multiple electromagnetic loss mechanisms, and is wide in effective absorption frequency band, light in weight, thin in thickness and high in wave-absorbing performance.

The invention relates to the technical field of powder coatings, in particular to high-fluidity superfine molding powder and a preparation method thereof. The high-fluidity superfine plastic powder comprises the following components in parts by weight: 40-50 parts of epoxy resin, 15-25 parts of a curing agent, 2-4 parts of a catalyst A, 3-5 parts of a plasticizer, 5-8 parts of polyacrylic acid and / or polyacrylate, 3-5 parts of a silane coupling agent, 10-20 parts of filler and 4-6 parts of other auxiliaries, the curing agent at least comprises a fluorine modified amine curing agent; and the median particle size D50 of the powder coating is 10-20 [mu] m. The powder coating adopting the epoxy resin / fluorine-modified amine curing agent system has better flowability and uniformity, charged powder particles can be guided to the surface of a workpiece under the action of an electric field to form a uniform thin coating, the powder particles are easier to carry charges with the same polarity, repulsive force among the particles is increased, and the powder coating can be applied to the surface of the workpiece. Uniform dispersion of powder particles can be kept, and the phenomenon of particle agglomeration is reduced.

The invention relates to the technical field of modifiers, in particular to a plant shell powder modifier and a preparation method thereof.The preparation method includes the steps that walnut shell powder, phenolic compounds and amine compounds are added into a stirrer with a temperature control jacket, stirred to be uniform and dried in vacuum, and performance characterization parameters of the plant shell powder modifier are calculated to obtain the plant shell powder modifier. According to the method, the phenolic compound and the amine compound are added into the walnut shell powder to modify the walnut shell powder, the compatibility between the modified plant shell powder modifier and rubber is improved, the dispersing performance is improved, the process is simple, the cost is low, and the method is suitable for industrial production. The performance of the plant shell powder modifier and the performance of a rubber product prepared by adding the plant shell powder modifier are evaluated, and whether the performance of the plant shell powder modifier meets the standard or not can be reliably evaluated.

The present invention provides a liquid crystal polymer, an LCP fiber, and a preparation method and application thereof, and belongs to the technical field of polymer materials. The monomer unit of the liquid crystal polymer of the present invention includes NH- and O- groups, and the molar content of the monomer unit containing NH- is 1 to 15%. The preparation method of the LCP fiber of the present invention uses the above-mentioned liquid crystal polymer as a raw material, sprays an alkyl phosphate ester salt aqueous solution during the spinning process, and the alkyl phosphate ester salt reacts with the amide group of the liquid crystal polymer to form a hydrogen bond, so that the alkyl phosphate ester salt is tightly combined with the LCP fiber, greatly improving the surface polarity of the LCP fiber, thereby improving the binding force between the LCP fiber and other resins.

This invention pertains to compositions of polymeric compounds, specifically a recycled rubber powder modified asphalt based on a renewable composite activator, its preparation method, and its application. The recycled rubber powder modified asphalt comprises a base asphalt and activated rubber powder in a mass ratio of 1:(0.2~0.3). The activated rubber powder comprises waste tire rubber powder and a composite activator in a mass ratio of 10:(0.8~1.5). The composite activator comprises an organic phase and an inorganic phase in a mass ratio of (1.5~3):1. The organic phase is a chitosan-amino acid derivative, and the inorganic phase is a layered bimetallic hydroxide. Compared with existing technologies, the rubber powder modified asphalt prepared by this invention exhibits good high-temperature storage stability and interfacial structural integrity, demonstrating excellent anti-aging properties and high-temperature rutting resistance during long-term service.

The invention provides a carbon fiber reinforced polyether-ether-ketone self-lubricating composite material and a preparation method and application thereof.The preparation method comprises the steps that carbon fiber serves as an anode, voltage is applied to an electrolyte solution, electrochemical oxidation treatment is conducted, hydroxylated carbon fiber is obtained, the hydroxylated carbon fiber and 2-amino-5-nitrobenzothiazole are mixed, and the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is obtained. Adding an anhydrous modified reaction solvent, and reacting at 25-40 DEG C for 4-10 hours to obtain modified carbon fibers; and melting and granulating the self-lubricating composite material: mixing the modified carbon fiber, polyether-ether-ketone, a lubricant and an auxiliary agent in a high-speed mixer for 10-20 minutes, extruding by using a double-screw extruder, cooling, and granulating to obtain the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material. The carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is applied to self-lubricating mechanical parts. According to the self-lubricating composite material, the self-lubricating performance is improved, the interface bonding energy between the carbon fibers and the polyether-ether-ketone is enhanced, and the self-lubricating composite material has good mechanical performance.

The invention relates to a conductive agent and a preparation method thereof, a pole piece, a secondary battery and an electric device. The conductive agent comprises a nitrogen-doped porous carbon nanosheet with a lamellar structure. According to the conductive agent provided by the invention, the nitrogen-doped porous carbon nanosheet with the lamellar structure is adopted as the conductive agent, on one hand, the lamellar structure forms a large-area conductive network, so that electrons can be conducted in a two-dimensional space, and meanwhile, nitrogen is doped in the carbon nanosheet to introduce additional conductive contact sites; the porous structure effectively increases the specific surface area, so that the conductivity of the conductive agent is improved. And on the other hand, the material cost of the conductive agent is reduced, and through the synergistic effect of nitrogen doping and the porous structure, the dispersity of the conductive agent in the slurry is improved, the agglomeration phenomenon is reduced, the preparation yield of the pole piece is improved, and large-scale industrial application is further facilitated.

This invention relates to a volatile organic compound (VOC) adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, followed by vanadium modification to obtain a Li-V-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.8%–4.5%, and the V content is 0.2%–1%. The adsorbent material obtained by this invention, using a 5A molecular sieve as a matrix and modified to obtain the Li-V-5A adsorbent material, has advantages such as good adsorption effect on low-carbon hydrocarbons and strong resistance to sulfur poisoning, especially high adsorption and removal rate of ethane.

The invention belongs to the technical field of composite material forming, and particularly relates to a silicon-containing coating and a preparation method thereof as well as a modified nylon material as well as a preparation method and application thereof. Polysiloxane with small molecular weight is adopted, so that the product can be cured and formed at low temperature, energy consumption in the production process is reduced, and the thermal shrinkage phenomenon of nylon fibers in a high-temperature process is avoided. The silicon-containing coating provided by the invention not only can be cured and molded at low temperature, but also can resist higher temperature, the raw materials are easy to obtain, and the cost is controllable. According to the modified nylon material provided by the invention, the surface polarity of the nylon fiber is improved by utilizing the silicon-containing coating, the obtained modified nylon material not only has good thermal stability and no silicon migration, but also is easy to remove from the surface of a composite material product after being used, and grains of fiber cloth are reserved on the surface of the product, so that the post-treatment time of the product is shortened, and the service life of the product is prolonged. And the production efficiency of the composite material is improved.

The invention discloses a silk-screen printing in-mold decoration method. The method comprises the following steps that firstly, a thin film is pretreated; 2, carrying out corona treatment on the pretreated film; 3, designing a plurality of layers of patterns, and manufacturing a corresponding screen printing plate; pouring printing ink into a screen printing plate according to the color requirement of the first layer, uniformly imprinting the printing ink to the surface of a film by using a scraper, and drying; according to the number of layers needing to be printed, the printing step of the first layer is repeated; wherein in the silk-screen printing process of a certain layer or several layers, corona treatment is carried out at the same time; and 4, cutting, forming, punching, inspecting, in-mold injection molding, film covering and inspecting are conducted on the printed film, and the decorative product is obtained. According to the in-mold decoration method disclosed by the invention, the ink can be more easily spread on the surface of a thin film, so that the adhesiveness of the ink is remarkably improved; meanwhile, the interaction force and the chemical bonding force between the ink and plastic film molecules are enhanced, and the firmness and the durability of printed patterns are ensured.

The present application relates to the technical field of carbon nanotube composite material, in particular to a carbon nanotube / polystyrene composite material, a preparation method and application thereof, the preparation method comprising the following steps: (1) carbon nanotubes are soaked in acid solution, taken out after treatment under ultrasonic condition, and acidized carbon nanotubes are obtained; (2) the acidized carbon nanotubes are mixed with polystyrene particles, and the mixture is uniformly stirred by mechanical stirring to obtain a premix; (3) the premix is placed in a screw extruder, heated, melted, extruded and cooled to obtain the carbon nanotube / polystyrene composite material. The acidization treatment method of carbon nanotubes is adopted, hydrophilic functional groups such as hydroxyl and carboxyl are introduced, the surface polarity of CNT is improved, and the compatibility of CNT in the PS matrix is improved. The method is simple and easy to operate, can significantly improve the mechanical properties and conductivity of the composite material without introducing other impurities, the process is simple and controllable, and is suitable for large-scale continuous production.

The application discloses an enhanced polytetrafluoroethylene composite framework structure composite material and a preparation method thereof. The material is composed of polysulfone modified polytetrafluoroethylene resin, carbon fiber, molybdenum disulfide, a reactive silicone resin precursor and a platinum catalyst, a continuous three-dimensional siloxane network is constructed in situ at the interface through a silicon hydrogen addition cross-linking, and a multi-scale reinforced framework structure is formed in cooperation with the carbon fiber. The material has excellent mechanical properties, creep resistance and wear resistance, and is suitable for high-performance sealing and wear-resistant fields.

The present application relates to the technical field of paint, in particular to an alkali-resistant waterproof exterior wall paint and a preparation method thereof. In order to further improve the water resistance and alkali resistance of the stone-like paint, the stone-like paint is improved, a texture protective paint is added to the structure of the traditional stone-like paint, and colored sand is added to the components, so that a concave-convex texture can be provided for the surface of the stone-like paint after the stone-like paint is finally formed. In addition, boron nitride nanosheets are added to the texture protective paint and modified, and fluorine and silicon elements are introduced into the boron nitride nanosheets, so as to improve the chemical corrosion resistance of the resin, prevent the infiltration and invasion of external corrosive media, and effectively improve the acid and alkali resistance of the resin paint.

The application provides a kind of fabric reinforced polymer composite material and preparation method, the method is first by hydroentanglement process thermoplastic fiber web is fixed on the two sides of fabric, and hydroentanglement makes thermoplastic fiber in thermoplastic fiber web and fabric interpenetration and hold together, and combine firmly;After drying, the polymer surface film is covered on the two sides of base cloth layer, and the polymer surface film is combined with base cloth layer by heating, because the surface of base cloth layer is the same material as the composition of polymer surface film, the material remains consistent, it is convenient for hot forming fusion, thereby increasing the peel strength, and improving the adhesion strength of composite material coating.Moreover, when the hydroentanglement medium is polymer solution, the polymer solution will remain in the pores of fabric and thermoplastic fiber web during the hydroentanglement process, and when subsequent drying and heating, the polymer in the pores will be integrated with the thermoplastic fiber web, thereby further enhancing the peel strength.

The extra-black color paste for coloring the gum fiber stock solution comprises the following raw materials in parts by weight: 35-40 parts of modified carbon black, 10-15 parts of a dispersing agent, 2-4 parts of a pH regulator and 30-35 parts of water. According to the invention, the surface polarity of the carbon black can be improved, agglomeration can be reduced, ball milling coating is carried out through an additive solution (containing a basalt fiber modifier, boron nitride, chitosan and yttrium nitrate), the dispersion uniformity of carbon black particles is further improved, the light absorption capability can be enhanced through the uniform dispersion of the carbon black particles, the blackness of the color paste is greatly improved, and the coloring requirement of special black is met.

This invention relates to the field of textile fabric technology, specifically to a high-elasticity fiber fabric and its molding process. The fabric comprises a knitted base fabric woven from nylon-coated modified polyurethane elastic fiber-coated yarn. The modified polyurethane elastic fiber comprises a core elastic polyurethane phase and a surface hard-segment enriched phase. The surface phase is formed by a composite of polycarbonate diol-type high-hardness polyurethane prepolymer, hydrophilic fumed silica, hydrophobic fumed silica, and hydroxyalkyl-terminated polydimethylsiloxane. This invention significantly improves the interfacial stability between the core yarn and nylon without increasing fiber usage or fabric tightness, giving the fabric high elastic recovery rate, low dimensional change after washing, and excellent sweat and heat resistance, thus solving the problem of easy loosening and deformation in traditional high-elasticity fabrics.

The invention relates to the technical field of carbon materials, in particular to a modified graphene microchip and a preparation method and application thereof.The preparation method comprises the steps that S1, maleic anhydride and expanded graphite or worm graphite are stirred and mixed, and a first premix is obtained after cooling; s2, stirring and mixing the first premix with a liquid peroxide initiator to obtain a second premix; and S3, heating the second premix in vacuum and reacting for a certain time, and cleaning and crushing to obtain the modified graphene nanoplatelets. According to the preparation method, maleic anhydride is intercalated and grafted to expanded graphite or vermicular graphite in a low-cost environment-friendly manner, and the expanded graphite or vermicular graphite is stripped by utilizing gas generated by reaction to obtain the maleic anhydride grafted graphene nanoplatelets, so that the surface polarity of the graphene nanoplatelets is greatly improved, and the compatibility of the graphene nanoplatelets with resin, a solvent and the like is effectively improved.

The invention relates to the technical field of organosilicone addition type heat-conducting flame-retardant pouring sealants, and particularly discloses an addition type pouring sealant base coating liquid as well as a preparation method and application thereof. The addition type pouring sealant primer comprises the following components in parts by weight: 50-70 parts of a tackifier, 0.5-4 parts of a cross-linking agent, 0.001-0.1 part of a catalyst and 30-50 parts of a solvent, the tackifier is a functional titanate tackifier modified by titanate; the titanate modified functional type titanate tackifier is prepared from trimethylolpropane diallyl ether, ethyl acetoacetate and mono-alkoxy type titanate through an ester exchange reaction. The addition type pouring sealant disclosed by the invention can be used for improving the adhesion of each component in the driving power supply, preventing water vapor or moisture in the air from easily permeating into an electronic device through a combined surface of a material and a glue layer, and being beneficial to improving the waterproof and moistureproof performance of the LED driving power supply when the LED driving power supply is used outdoors.

The application discloses a preparation method of a high-fluorine-containing crosslinked polyimide nanofiber membrane, and comprises the following steps: synthesizing a polyamide acid precursor solution by mixing hexafluoro aromatic diamine and aromatic dianhydride in a solvent, preparing the polyamide acid precursor solution into a spinning solution, preparing a polyamide acid nanofiber membrane by a high-pressure electrospinning method, drying the polyamide acid nanofiber membrane in a vacuum environment at 100-200 DEG C for 0.5-1 h, then increasing the temperature to 200-300 DEG C and heating for 2-4 h, and finally increasing the temperature to 300-350 DEG C under nitrogen to perform thermal amidation and thermal crosslinking, and the holding time is 1-2 h. The application further discloses a lithium ion battery separator, which is the high-fluorine-containing crosslinked polyimide nanofiber membrane prepared by the above method. The introduction of dihydroxy and chemical crosslinking solve the problem that too high fluorine group content makes the solubilization ability of the polyimide membrane to the electrolyte too strong, and realize the application of the high-fluorine-containing nanofiber membrane as a high-performance lithium ion battery separator.

The application discloses a perovskite flexible solar cell and lithium-sulfur battery integrated self-charging system and a preparation method thereof. The system comprises a perovskite flexible solar cell and a lithium-sulfur battery. The perovskite flexible solar cell comprises a flexible substrate, a transparent conductive layer and a plurality of perovskite cell units arranged in sequence. The perovskite cell unit comprises an electron transport layer, a perovskite layer and a hole transport layer arranged in sequence. Each perovskite cell unit is in a series connection relationship. The positive electrode of the last perovskite cell unit serves as the positive electrode of the perovskite flexible solar cell. The negative electrode of the first perovskite cell unit serves as the negative electrode of the perovskite flexible solar cell. The lithium-sulfur battery comprises a positive electrode, a negative electrode and a solid electrolyte. The positive electrode is electrically connected with the positive electrode, and the negative electrode is electrically connected with the negative electrode, so as to form a loop. The application can improve the integration, overall efficiency and stability of the self-charging system.

This invention discloses a high thermal conductivity and electromagnetic shielding polyimide coating and its preparation method, belonging to the field of polyimide coating technology. The coating comprises the following raw materials in parts by weight: 32 parts of diamine monomer, 33 parts of dianhydride monomer, 582 parts of organic solvent, and 3.4-11.5 parts of nitrogen-doped helical carbon nanotube-supported carbon nanofibers. The preparation method includes the following steps: ultrasonically dispersing nitrogen-doped helical carbon nanotube-supported carbon nanofibers in an organic solvent; then, under nitrogen protection and an ice-water bath condition, dissolving the diamine monomer in the dispersion; and then adding the dianhydride monomer to carry out a polycondensation reaction to obtain a high thermal conductivity and electromagnetic shielding polyimide coating. This invention, through an integrated design of "composition-structure-interface," constructs an efficient and stable three-dimensional multifunctional network within the polyimide matrix, achieving a synergistic improvement in the coating's electromagnetic shielding and thermal conductivity performance, providing an ideal material solution for the field of high-end electronic packaging and protection.

The invention relates to a water-based inorganic zinc-rich primer capable of being constructed in a low-temperature environment and a preparation method of the water-based inorganic zinc-rich primer, and belongs to the technical field of paints.The water-based inorganic zinc-rich primer is composed of a component A and a component B. During construction, the component A and the component B are used after being evenly mixed according to the mass ratio of (3-4): 7. The component A is composed of a potassium silicate aqueous solution, a carboxylated modified cellulose nanocrystal pre-dispersion liquid and deionized water, and the component B is composed of modified zinc powder, modified conductive carbon black, a composite low-temperature quick-drying catalyst and ferrophosphorus powder; according to the obtained primer, the construction time is 83-93 minutes, the surface drying time is 5-6 minutes and the hard drying time is 35-42 minutes under the conditions that the temperature is 5 DEG C and the humidity is 50%, the surface drying time is 2-4 minutes and the hard drying time is 23-26 minutes under the conditions that the temperature is 20 DEG C and the humidity is 50%, the flexibility of a paint film is 1 mm, the adhesive force is 12-15 MPa, the neutral salt mist resistance is 5754-5986 hours, and the high temperature resistance is 253-260 hours.

This invention relates to a VOCs adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, and then modifying it with titanium to obtain a Li-Ti-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.65%–4.2%, and the Ti content is 0.15%–0.85%. The adsorbent material obtained by this invention is a Li-Ti-5A adsorbent material obtained by modification using a 5A molecular sieve as the matrix. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

The invention discloses a method for improving the electrolyte infiltration efficiency of a large-size power battery, and belongs to the technical field of power batteries, and the method comprises the following steps: carrying out surface micro-oxidation treatment on conductive carbon, so that the contact angle between the conductive carbon and an electrolyte used by a selected battery model is reduced to meet a preset requirement, and obtaining surface micro-oxidation conductive carbon; the surface micro-oxidation conductive carbon is assembled into a large-size power battery according to a selected battery model; liquid injection is performed twice in batches, a pure solvent is injected for the first time, and a high-concentration electrolyte is injected for the second time; and after packaging, standing at 45 DEG C to finish the infiltration process. Only a small amount of conductive carbon on the electrode plate is optimized, then electrolyte with different concentrations is used for step-by-step liquid injection, and surface micro-oxidation can be completed only in 5-30 min. The existing battery production process does not need to be greatly changed, and the input cost is relatively low. More efficient electrolyte infiltration is realized, the production time is shortened, and the production cost is reduced.

The invention relates to the technical field of automobile plastic part processing, in particular to a method for plasma treatment of an injection molded part, which comprises the following steps: producing the automobile injection molded part through injection molding, constructing a mathematical model about surface tension, and determining plasma processing equipment; and processing the automobile injection molding part at a set plasma processing speed by using plasma processing equipment, monitoring the distance between the plasma and the automobile injection molding part in real time, calculating the target distance between the plasma and the automobile injection molding part according to the target surface tension and the constructed mathematical model, and adaptively adjusting to the target distance. Plasma is used for bombarding the surface of the automobile injection-molded part, deburring of the automobile injection-molded part is achieved, meanwhile, oxygen-containing and nitrogen-containing functional groups are introduced into the surface of the automobile injection-molded part through the plasma, the surface polarity is increased, the coating adhesive force is improved, the target surface tension can be obtained through self-adaptive adjustment by means of the pre-constructed mathematical model, and therefore the surface tension of the automobile injection-molded part is improved. And the automation degree of the plasma processing process is improved.