24 results about "Chemical affinity" patented technology

The invention relates to the technical field of packaging materials, in particular to an intelligent packaging film based on a multilayer packaging nanocomposite and a preparation method of the intelligent packaging film. On the basis of the anthocyanin CD-MOFs (core) with a physical adsorption function, an ovalbumin-sodium alginate (OVA-SA) nano-composite is innovatively introduced to construct a core-shell structure, and an OVA-SA shell and a CD-MOFs pore channel form a double barrier, so that the stability of the anthocyanin is remarkably improved; the OVA-SA shell is used as an interfacial compatibilizer, and the high chemical affinity of the OVA-SA shell and a corn starch / PVA matrix is utilized, so that nano-scale uniform dispersion of MOF particles in the matrix is realized, and agglomeration is effectively avoided; meanwhile, an active pH response gated release mechanism is formed, high stability is kept in the shelf life, shell response is triggered only when a decay product induces pH rise, anthocyanin is released, color development is carried out, and sensitive monitoring on the freshness of the high-protein food is achieved.

The application belongs to the technical field of X-ray tubes, and discloses an anode assembly and a processing method thereof. The anode assembly comprises a molybdenum reflector, a molybdenum rotor assembly and an intermediate layer. The intermediate layer is made of metal material and is arranged between the molybdenum reflector and the molybdenum rotor assembly by using the processing method. In the heating process, the intermediate layer can effectively absorb and buffer thermal stress and shrinkage stress generated from the molybdenum components on both sides due to heating and cooling through plastic deformation of the intermediate layer, thereby greatly reducing the risk of micro-cracks caused by stress concentration. Moreover, since the chemical affinity of the intermediate layer to impurity atoms is higher than that of molybdenum material, in a protective atmosphere or a vacuum environment, the intermediate layer can be ensured to preferentially react with the harmful impurities in the interface area during the welding process to form stable compounds, thereby preventing the impurities from segregating at the grain boundaries of molybdenum, significantly improving the microstructure and toughness of the molybdenum heat-affected zone, and enhancing the anti-grain boundary cracking ability.

The application relates to the technical field of ammonium oxidation, and discloses an anode material for ammonium oxidation under a low-concentration chloride ion condition and a preparation method thereof.The anode material takes manganese dioxide as a carrier and is loaded with monatomic silver, and the loading amount of the monatomic silver is less than 0.1 wt%.In the preparation process, first, constant current density electrodeposition is carried out to prepare a MnO2 / platinum-coated titanium mesh; then, a wet chemical immersion method is used to load Ag on the MnO2 substrate; finally, high-temperature air atmosphere calcination is carried out to prepare a monatomic Ag / MnO2 anode material.The application utilizes the acid resistance of MnO2 itself and the strong metal carrier interaction between metal Ag and MnO2 to realize stable and continuous electrolysis operation; and Ag and MnO2 realize the enrichment of low-concentration chloride ions at the anode interface through chemical affinity and physical adsorption, thereby realizing the efficient generation of active chlorine under the condition of low-concentration chloride ions.

The invention discloses a preparation method of a self-cleaning radiopharmaceutical filter membrane. The preparation method comprises the following steps: activating a PTFE (Polytetrafluoroethylene) membrane by adopting oxygen plasma and loading PVP (Polyvinyl Pyrrolidone) to form a hydrophilic base membrane; a ZrO2 layer is constructed through a dipping-ultrasonic dispersion method, and free technetate is specifically adsorbed by utilizing the coordination bonding effect of the ZrO2 layer; qCS is sprayed on the surface of the ZrO2 layer and cross-linked, and the anion capturing capacity is enhanced through electrostatic adsorption; a Fe3O4 nano-particle layer is deposited, and oxidation-reduction precipitation of pollutants is achieved by combining magnetic responsiveness and Fenton-like catalysis; a PZT-PDMS packaging layer is integrated at the edge of the membrane, and ultrasonic vibration is triggered through a high-frequency signal to assist self-cleaning; finally, a stable multi-layer structure is formed through hot-pressing curing and is balanced in a PBS buffer solution to adapt to the biological environment, specific adsorption of free pertechnetate is achieved through a ZrO2-QCS composite layer formed in S3 by means of chemical affinity, the transmittance of labeled drug molecules or colloidal compounds cannot be remarkably affected, and the detection sensitivity of the pertechnetate is greatly improved. And the selective removal capability on target pollutants is improved.

The invention relates to a monovalent selective cation exchange membrane modification method and application, and belongs to the technical field of electrically driven membranes.The method comprises the steps that a triaminoguanidine hydrochloride solution is prepared, and one side of a cation exchange membrane is soaked in the triaminoguanidine hydrochloride solution for one day at the room temperature; then preparing a 2, 5-dihydroxy terephthalaldehyde solution, injecting the 2, 5-dihydroxy terephthalaldehyde solution into the triaminoguanidine hydrochloride solution, uniformly mixing the two solutions on the surface of the cation exchange membrane, continuously soaking the cation exchange membrane in the mixed solution at room temperature for three days, and growing a COFs layer on the soaked side of the cation exchange membrane in situ; and finally, fully washing the soaked cation exchange membrane with deionized water to obtain the modified monovalent selective cation exchange membrane. According to the invention, the migration of magnesium ions is hindered through the comprehensive action of electrostatic repulsion and chemical affinity, effective screening of sodium ions and magnesium ions is realized, and the monovalent selectivity of the cation exchange membrane is improved on the basis of maintaining the flux of sodium ions.

Treatment of hydrocarbon formations using acid blends that contain water soluble polymers having chemical affinity for acid-susceptible rock species in the hydrocarbon formation is described herein. The polymers retard the activity of acid on acid-susceptible species of rock formations.

Described is a system for identifying a leak in a casing-casing annulus of a well. The system includes a chemical tracer spool positioned at a casing-casing annulus of a wellbore. The chemical tracer spool includes a porous layer with a polymer media and a chemical tracer molecule embedded in the porous layer. An inner surface of the porous layer defines a flow channel configured to allow fluid flow of a fluid. The chemical tracer molecule has a chemical affinity for oil, gas, or water, and is configured to diffuse into the fluid flow. A collection point is configured to collect a sample of the fluid.

The invention relates to a regional allergy risk real-time early warning method and device based on an environment micromolecule fingerprint spectrum, and the method comprises the steps: carrying out the real-time sampling of a microvolatile organic compound related to a predefined allergen in the air of a target region, and obtaining an original multi-dimensional characteristic spectrum; extracting a chemical fingerprint spectrum of each known allergen in the original multi-dimensional characteristic spectrum through a VOCs fingerprint spectrum model; dynamically matching the chemical fingerprint spectrum of each known allergen with a preset allergen chemical fingerprint spectrum database by using a Siamese network model, and calculating a comprehensive regional allergy risk factor; and according to the regional allergy risk factor and a preset multi-level allergy risk threshold, determining an allergy risk level of the current target region. According to the method, the purification signal characteristics corresponding to each known allergen are extracted through the VOCs fingerprint spectrum model, and the similarity, relevance and chemical affinity among different allergens are obtained through the Siamese network model, so that the method is closer to the real situation.

The invention relates to a metal ceramic cutter with an enhanced selective ion dragging interface and a preparation method. The metal ceramic cutter is characterized in that the selective ion dragging interface is arranged between a metal ceramic matrix and a composite coating; the selective ion dragging interface is a metal ceramic sub-interface which only contains injected metal ions and is not injected with inert gas ions, so that the chemical affinity with a metal ceramic matrix and a composite coating is improved, atomic diffusion at the interface is promoted, the interface coherence degree is improved, the defect rate is reduced, and the service life of the selective ion dragging interface is prolonged. Therefore, the quality of the metal ceramic cutter is improved.

The application relates to the technical field of adsorbing materials, and discloses a preparation method of a carbon dioxide capturing agent and application of the carbon dioxide capturing agent. The carbon dioxide capturing agent is prepared from nitrogen-containing porous carbon, quaternary ammonium kaolin and the like as raw materials through mixing, compression molding and sintering processes. The nitrogen-containing porous carbon has a high specific surface area and can exhibit higher adsorption capacity. Meanwhile, nitrogen element doping can introduce alkaline defect structures. These alkaline nitrogen sites have strong chemical affinity to acidic CO2 molecules, can improve the CO2 adsorption capacity of the porous carbon, and can also endow the activated carbon with the effect of selectively adsorbing CO2. The quaternary ammonium kaolin is prepared by modifying a large number of quaternary ammonium cations on the surface of kaolin. The quaternary ammonium kaolin can not only absorb carbon dioxide by using the structure itself, but also can improve the affinity of the capturing agent to carbon dioxide and enhance the adsorption effect by carrying positive electricity of the large number of quaternary ammonium cations on the surface.

This invention discloses a continuous treatment device for oxygen-resistant passivation liquid for cooling and annealing copper wire, belonging to the field of copper processing technology. The device includes a treatment tank, in which several interface adjustment rollers are sequentially arranged along the conveying direction of the copper wire within the tank's inner cavity. Guide grooves are formed on the outer walls of the interface adjustment rollers. The treatment tank stores passivation liquid, and the liquid level does not exceed the center of the interface adjustment rollers. This invention, through the design of a speed difference between the interface adjustment rollers, applies minute extension deformation to the copper wire within the treatment tank, thereby enabling the copper wire surface to continuously generate new metal surfaces, enhancing its chemical affinity with the passivation liquid. Simultaneously, the pressure and friction of the rollers on the copper wire mechanically process the newly formed initial passivation film, and simultaneously completes a small amount of drawing deformation, allowing the newly formed passivation film to extend synchronously with the substrate, forming a denser, crack-free film structure.

This invention discloses a hierarchical guanidine resin-based CO2 adsorbent material and its preparation method, belonging to the field of polymer synthesis technology. The adsorbent material prepared by this invention has a composite spherical structure and a hierarchical pore structure, including micropores, mesopores, and macropores. By introducing a hierarchical pore structure, the adsorption capacity of the material for CO2 is effectively improved. The introduction of hierarchical pores can significantly reduce molecular diffusion resistance and increase the contact area between the adsorbent and CO2 molecules, thereby achieving rapid adsorption. Furthermore, pyridyl, polyamino compounds, and guanidine groups have strong basicity and chemical affinity for CO2. Through surface functionalization modification, the number of active sites on the material surface is significantly increased, thereby further improving the CO2 adsorption capacity and selectivity.

The application relates to the technical field of photocatalytic materials, in particular to a nano photocatalytic adsorption composite material for air purification and a preparation method thereof, which comprises the following raw materials: modified coconut shell activated carbon, nano titanium dioxide, carbon nitride, silica sol, ceramic fiber, polyethylene glycol, sodium hexametaphosphate and deionized water. In the application, the nitrogen-doped carbon layer in the modified coconut shell activated carbon cooperates with the abundant pore structure of the original activated carbon, not only retains the strong physical adsorption enrichment capacity for pollutants, but also enhances the chemical affinity for specific pollutants through the nitrogen-containing functional groups introduced on the surface; secondly, the in-situ grown zinc oxide / cobaltosic oxide composite forms a close interface contact with the carbon base, is beneficial to interface electron migration and transmission, and realizes synchronous and cooperative purification of adsorption-migration-photocatalytic degradation.

The invention provides a bionic dandelion proppant system and a preparation method and application thereof, the bionic dandelion proppant system has the characteristics of simple process, low energy consumption, environmental protection and no pollution, and the bionic dandelion proppant system is prepared by specifically compounding modified tailing particles and modified fibers. And by utilizing the chemical affinity of active sites on the surfaces of the tailings and the fibers and the bridging effect of calcium carbonate crystals, the tailings particles and the fibers are self-assembled in the fracturing fluid to form a stable dandelion-like cluster structure. By means of the structure, the suspension transportation performance of the tailing proppant in fracturing fluid is remarkably improved, the tailing proppant can be carried to the deep position of a crack, efficient filling is achieved, meanwhile, the formed cluster sand bank constructs a high-seepage-flow pore channel, and even if part of tailing particles are broken under the high pressure, the tailing proppant can be effectively filled. And the cluster structure can still maintain the overall configuration and pore connectivity by virtue of the winding effect of the fibers, so that the problem of low self-strength of the tailing material is ingeniously avoided, and a brand new path is provided for realizing large-scale and high-value utilization of the tailings.

The invention relates to a BD2 alloy ductile iron roller and a preparation process thereof, and relates to the technical field of rollers. Pre-casting a stepped hole pattern; and carrying out precise temperature return spray quenching treatment. Through the cooperative process of stepped hole pattern precasting and precise temperature returning spray quenching, the problems that a BD2 deep groove roller is prone to cracking and uneven in hardness are solved from the two aspects of the physical structure and the thermodynamics. Through a further microalloying improvement scheme, the strengthening thought that a traditional BD2 alloy seriously depends on expensive nickel elements is broken through, trace aluminum and nitrogen elements are accurately introduced on the basis of reducing the nickel content, and the high chemical affinity of the trace aluminum and nitrogen elements in molten iron and the core-spun yarn synchronous feeding technology are utilized; and in-situ synthesis and uniform dispersion distribution of the high-melting-point AlN nanoparticles are realized.

The invention relates to a nano lignin-based flotation desulfurization collecting agent and a preparation method and application thereof, and belongs to the technical field of mineral flotation. The collecting agent comprises a nanoscale lignin core, alkyl chains and sulfydryl collecting functional groups, wherein the alkyl chains and the sulfydryl collecting functional groups are grafted to the surface of the core. The sulfydryl collecting functional group realizes selective recognition and collection by utilizing the specific chemical affinity of sulfur atoms and iron ions on the surface of the pyrite. The nanoscale lignin core has a particle form and a high specific surface area, after the collecting agent is adsorbed to the surface of pyrite through a sulfydryl functional group, the core can be firmly anchored to minerals, and the binding force of the collecting agent and the minerals is enhanced. Meanwhile, the surface of the pyrite is hydrophobic through the grafted alkyl chain, and the pyrite is promoted to be attached to bubbles and float upwards. In addition, the nanoscale lignin core has no affinity to diaspore, and can inhibit floating of aluminum minerals. Through the synergistic effect, the collecting agent achieves efficient separation of pyrite and diaspore.

The invention belongs to the technical field of X-ray tubes, and discloses an anode assembly and a processing method thereof.The anode assembly comprises a molybdenum reflector plate, a molybdenum rotor assembly and a middle layer, the middle layer is made of metal and arranged between the molybdenum reflector plate and the molybdenum rotor assembly through the processing method, and in the heating process, the molybdenum rotor assembly is heated through the middle layer; the middle layer can effectively absorb and buffer thermal stress and shrinkage stress generated by heating and cooling of molybdenum components on the two sides through plastic deformation of the middle layer, and the risk that microcracks are generated due to stress concentration is greatly reduced. As the chemical affinity of the intermediate layer to impurity atoms is higher than that of a molybdenum material, the intermediate layer can be ensured to preferentially react with harmful impurities in an interface area to form a stable compound in a protective atmosphere or a vacuum environment in the welding process, so that segregation of the impurities at the grain boundary of molybdenum is prevented, and the welding quality is improved. The microstructure and toughness of a molybdenum heat affected zone are remarkably improved, and the grain boundary cracking resistance is enhanced.

This invention discloses a high-adhesion, high-reliability acrylic voltage-sensitive adhesive and its preparation method. The adhesive comprises an acrylic copolymer resin, surface-modified conductive powder, surface-modified conductive reinforcing fibers, a tackifying resin, a crosslinking agent, and a coupling agent. By introducing characteristic monomers containing phosphate ester groups, the chemical affinity of the adhesive to the metal substrate is enhanced. Simultaneously, a three-dimensional conductive network is constructed using silver-coated copper powder and carbon nanotubes / graphene, and surface grafting modification enables covalent bonds between the filler and the matrix. This solves the problems of filler sedimentation and the difficulty in simultaneously achieving conductivity and adhesion in traditional voltage-sensitive adhesives. The voltage-sensitive adhesive prepared by this invention exhibits excellent adhesive strength, conductive stability, and long-term reliability, making it suitable for electronic packaging and electromagnetic shielding applications.

The invention discloses a neodymium-iron-boron magnetic steel film layer strengthening pretreatment method based on surface energy regulation and control. The neodymium-iron-boron magnetic steel film layer strengthening pretreatment method sequentially comprises the processes of degreasing and oil removal, acid pickling, ultrasonic cleaning, phosphorization, sealing and curing. Pickling with a pickling solution containing nitric acid and citric acid monohydrate; the phosphating process is zinc-manganese-nickel three-system phosphating, and a micro porous phosphate conversion film is formed; in the sealing process, a surface energy modification solution containing hydrogenated heavy naphthenic fraction, 1-(2-butoxy-1-methyl ethyoxyl)-2-propyl alcohol and diethylene glycol is adopted; the phosphating solution has the advantages that the formed phosphating film has high surface energy and a high dispersion component to polarity component ratio through surface energy regulation and control, the characteristics of high surface energy and low polarity are shown, the wettability and chemical affinity of the phosphating solution to coatings with different polarity characteristics are remarkably improved, firm and universal interface bonding between the phosphating solution and various coating materials is achieved, and the surface performance of the phosphating solution is improved. And the reliable attachment requirement of diversified coating of the neodymium iron boron magnetic steel is met.

The invention relates to the technical field of surface treatment, and discloses a lubricating DLC film, a preparation method thereof, a sliding vane and a compressor. The lubricating DLC thin film comprises a Cr layer on the bottom layer, a Cr-C transition layer on the middle layer and a DLC film layer on the surface layer. The Cr content in the Cr-C transition layer is gradually reduced along the direction from the bottom layer to the surface layer, and the C content is gradually increased along the direction from the bottom layer to the surface layer. The pure Cr layer in the lubricating DLC thin film can effectively prevent elements of the sliding sheet substrate from diffusing into the DLC thin film, and the purity and performance of the DLC thin film can be maintained. On the basis, the content gradient change of the two elements of Cr and C forms a transition middle layer, and depending on the chemical affinity characteristic of Cr and C, the binding force of the DLC film and the sliding vane substrate is improved, the stability of an interface is promoted, so that the surface DLC film can stably and durably exert the lubricating performance, the abrasion between the sliding vane and a cylinder body is reduced, and the working condition stability of an air conditioner compressor is guaranteed.

The invention relates to the field of sodium ion batteries, and discloses a preparation method and application of an additive induced coordination compound derived Bi nitrogen-doped carbon composite material. The preparation method comprises the following steps: chelating an organic ligand with Bi ions in bismuth salt through a mechanochemical method to obtain a precursor Bi-HMT; subsequently, mixing and grinding the precursor and an additive to obtain an intermediate product, and performing high-temperature pyrolysis and carbon thermal reduction on the intermediate product to obtain a final product Bi nitrogen-doped carbon composite material. When the material is used as a sodium ion battery negative electrode, a nitrogen-doped carbon skeleton generated based on in-situ conversion of a coordination compound and an additive can be tightly combined with Bi particles, agglomeration among the Bi particles is avoided, volume change caused by intercalation and deintercalation of sodium ions is effectively relieved, heteroatom nitrogen is introduced through an organic ligand to modify the carbon skeleton, and the specific surface area of the material is increased. The chemical affinity of the material is improved, the overall conductivity of the composite material is improved, and the cycling stability and the rate capability of the material are enhanced.

A method for preparing an n-type lead telluride-based thermoelectric material with synergistically improved high-temperature stability and thermoelectric performance, using the chemical formula PbTe. 1‑x I x A composite material was prepared by introducing 0.25–0.75 wt.% micron-sized metallic Mo powder into an n-type iodine-doped PbTe matrix, followed by ball milling and spark plasma sintering (SPS). Utilizing the high melting point of Mo powder and its chemical affinity for Te, a physical barrier was constructed at the grain boundaries, forming Mo-Te bonds that effectively suppressed Te volatilization at high temperatures. Simultaneously, the matching thermal expansion coefficients of Mo and PbTe prevented the formation of microcracks during thermal cycling. Experiments showed that the sample with 0.5 wt.% Mo exhibited significantly improved thermoelectric performance retention after long-term aging at 750 K without sacrificing the room-temperature thermoelectric figure of merit. This invention features a simple and low-cost process, significantly improving the high-temperature service stability of n-type PbTe materials, and is suitable for the field of thermoelectric power generation.

This invention relates to the field of polymer material additives and discloses a method for modifying TPU film components to improve weather resistance. The method includes: coating the surface of nano-zinc oxide powder with a molten hindered amine light stabilizer in a high-pressure frictional flow field to form a core-shell structured composite preform; introducing the preform into a gradient thermal evolution field of a polyurethane base material; using transient kinetic energy generated by pulsed alternating shear force to peel off the shell of the preform; inducing in-situ hydrogen bonding between the exposed active crystal faces of the nano-zinc oxide powder and the hard segment polar groups of the molten polyurethane base material to form anchoring units; and inducing transient phase separation in the hard segment micro-regions by adjusting the temperature difference and locking the anchoring units at the phase interface. This invention eliminates the physical path of spontaneous migration of non-polymer organic matter to the film surface by constructing anchoring units with chemical affinity.

The invention discloses an anti-hydroxyl surface passivation thermal barrier coating for a hydrogen mixed fuel environment and a preparation method of the anti-hydroxyl surface passivation thermal barrier coating. The anti-hydroxyl surface passivation thermal barrier coating aims at solving the problem that a coating is degraded under hydrogen combustion and hydrogen / natural gas mixed combustion working conditions through water vapor induction. According to the hydroxyl-resistant surface passivation thermal barrier coating, a metal bonding layer, a ceramic surface layer and a fluorine-containing enrichment gradient layer are sequentially arranged on a metal matrix from bottom to top, the ceramic surface layer is a rare earth oxide doped zirconium dioxide ceramic layer and / or a rare earth doped lanthanum zirconate ceramic layer, and the fluorine-containing enrichment gradient layer is a fluorine-containing enrichment gradient layer. The fluorine-containing enriched gradient layer is formed by spraying fluorine-containing rare earth sol and then carrying out heat treatment and solid-phase activation diffusion treatment. Through the fluorine-containing enrichment layer, the chemical affinity of the surface to high-temperature water vapor and hydroxyl can be remarkably reduced, generation of volatile matter such as RE (OH) 3 and loss of a rare earth stabilizer are inhibited, and water vapor induced surface layer sintering densification and heat conductivity rising are weakened; therefore, the heat insulation performance maintaining capability and the heat cycle life of the thermal barrier coating under the hydrogen combustion / hydrogen mixed combustion working condition are improved.