18results about How to "Reduced diffusion rate" patented technology

The application provides an organic-solvent-resistant nanofiltration membrane containing an active intermediate layer and active nanoparticles and a preparation method thereof, and belongs to the technical field of nanofiltration membranes. The organic-solvent-resistant nanofiltration membrane provided by the application comprises a support layer and a polyamide separation layer located on the surface of the support layer; the support layer is a polyimide ultrafiltration membrane base film; the polyamide separation layer is a modified polyamide layer; the modification method is modification by adding an intermediate layer and an additive; the intermediate layer is polydopamine / polyethyleneimine; and the additive is aminozed attapulgite nanoparticles. The polydopamine / polyethyleneimine and aminozed attapulgite are used in synergistic action to prepare the organic-solvent-resistant nanofiltration membrane, so that the organic-solvent-resistant nanofiltration membrane has high permeation flux and high retention rate.

The invention relates to the technical field of air bricks, in particular to an anti-erosion air brick and a preparation process thereof, and the anti-erosion air brick comprises the following components: fused magnesite particles, crystalline flake graphite, modified zirconia fine powder, metal aluminum fine powder, boron carbide fine powder and phenolic resin. According to the invention, through modified titanate and modified boric acid, a composite coating layer is constructed on the surface of zirconium oxide, and a titanium dioxide compact layer is generated in situ by using a titanium component at a high temperature, so that erosion of calcium oxide in slag is blocked; meanwhile, the boron component forms a high-melting-point phase to fill grain boundary pores, and slag permeation and harmful dendritic crystal precipitation are inhibited, so that the structural stability and slag corrosion resistance of the air brick are improved.

The invention provides austenitic stainless steel as well as a preparation method and application thereof, and relates to the field of high-temperature-resistant austenitic stainless steel. The austenitic stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.10% of C, less than or equal to 0.12% of N, less than or equal to 2.0% of Si, 1.0-2.0% of Mn, 16.0-18.0% of Cr, 10.0-14.0% of Ni, 2.0-3.0% of Mo, 0.05-0.10% of Nb, 0.05-0.10% of Ti, less than or equal to 0.02% of S, 0.04-0.06% of P and the balance of Fe and inevitable residual elements. The content of P in the stainless steel is increased, the diffusion rate of solute atoms such as Cr and Mo can be reduced through interaction of P and vacancies at the high temperature, nucleation of M23C6 carbides and the like at the grain boundary is inhibited, the precipitation number is remarkably reduced, meanwhile, P is discharged outwards in the coarsening process of the M23C6 carbides, a core-shell result that the M23C6 carbides are wrapped by the P element is formed, the coarsening rate of the M23C6 carbides is reduced, and the corrosion resistance of the stainless steel is improved. Furthermore, a creep cavity caused by a precipitated phase in the creep process is inhibited, and the creep fracture strength is improved.

This application belongs to the technical field of flame-retardant intumescent thermal insulation materials, specifically providing an inorganic intumescent thermal insulation fireproof coating and its preparation method. The inorganic intumescent thermal insulation fireproof coating comprises the following components: potassium silicate solution, aluminum dihydrogen phosphate, porous composite filler, melamine, pentaerythritol, aluminum hydroxide, glass powder, expandable graphite, mullite fiber, BYK-025 defoamer, sodium tripolyphosphate dispersant, and hydroxypropyl methylcellulose thickener. The inorganic intumescent thermal insulation fireproof coating obtained by this application exhibits excellent bonding strength, high-temperature structural stability, and controllable expansion, making it suitable for fire protection in scenarios such as new energy battery boxes and steel structure buildings, and capable of meeting stringent fire protection requirements.

The invention belongs to the technical field of electric heaters, and particularly relates to a preparation method of a long-life high-temperature magnesium oxide powder heating pipe. The method comprises the steps that an electrothermal alloy wire is pre-oxidized for 1-3 h in an oxygen-containing atmosphere at 900-1100 DEG C, a compact oxidation film is generated on the surface of the electrothermal alloy wire, and a pre-oxidized electrothermal alloy wire is obtained; the pre-oxidized electrothermal alloy wire is arranged in the axial direction of a metal protective sleeve, the metal protective sleeve is filled with fused magnesia powder with the purity larger than or equal to 96 wt%, then diameter shrinkage is conducted on the metal protective sleeve, and the fused magnesia powder is compacted and wraps the pre-oxidized electrothermal alloy wire; carrying out curing heat treatment on the reduced metal sheath tube; annealing is carried out on the processed metal protective sleeve; and cleaning the two ends of the annealed metal sheath pipe to obtain the high-temperature magnesium oxide powder heating pipe.

This invention belongs to the field of compositions of polymeric compounds for oral care products, specifically relating to a sustained-release system for oral care products, its preparation method, and its application. This invention discloses that when a cationic polymeric compound, sodium alginate, and ectoine are used in combination, a unique OraReliX™ sustained-release system can be formed on the tooth surface. The core working principle of this system is as follows: the cationic substance adheres to the negatively charged tooth surface through electrostatic adsorption, forming a cationic network; sodium alginate regulates the network density through polyelectrolyte complexation with this cationic network, while reversibly binding calcium ions; ectoine stabilizes the oral microenvironment and protects the sustained-release network structure. The synergistic effect of these three components significantly slows down the release rate of calcium ions, prolonging their effective retention time in the oral cavity.

This invention relates to a whitening and stain-removing toothpaste that effectively reduces attached pigments and its preparation method. The toothpaste comprises sorbitol, hydrated silica, polyethylene glycol-400, glycerin, niacinamide, sodium lauryl sulfate, sodium hexametaphosphate, sodium benzoate, cellulose gum, sodium phytate, flavoring, olaflu, xanthan gum, sodium saccharin, menthol, sodium bicarbonate, and water. This invention utilizes the temperature-sensitive thickening properties of cellulose gum and xanthan gum, combined with a staged, precise temperature-controlled feeding process. Sodium hexametaphosphate and sodium phytate are pre-dissolved in a high-temperature stage; xanthan gum and cellulose gum are added in a medium-temperature stage to form a colloidal thickening network; and finally, niacinamide and olaflu are added in a low-temperature stage, along with a post-curing treatment. This effectively solves the antagonistic problem between niacinamide, olaflu, sodium hexametaphosphate, and sodium phytate, achieving stable coexistence and synergistic effects of the various active ingredients. The resulting toothpaste effectively reduces pigment adhesion to the tooth surface, exhibiting good whitening and stain-removing effects and excellent stability during use.

The present application belongs to the technical field of special metal material heat treatment, and particularly relates to a special metal material and a surface and interface heat treatment process thereof. The material composition is as follows in terms of weight: C 0.03-0.08%, Cr 18.0-22.0%, Ni 8.0-12.0%, Nb 0.05-0.15%, Mo 1.5-2.5%, and the balance of Fe. The process comprises: 1050-1150 DEG C solid solution, 850-900 DEG C low-temperature rare earth carburizing, adding 0.3-0.8% nano La2O3, and inductive quenching in a temperature environment of 900-950 DEG C, and finally tempering in a temperature environment of 200-250 DEG C. The present application realizes comprehensive improvement of surface hardness, core impact toughness, neutral salt spray corrosion resistance and other performances. The workpiece made of the special metal material of the present application is suitable for heavy load corrosion working conditions, and the process can be reformed by using existing equipment, thus being low in cost.

This invention belongs to the field of black phosphorus preparation technology, and particularly relates to a method for preparing black phosphorus thin films with controllable thickness based on CVT. The technical problem to be solved is the technical challenge of large-size film growth in the industrial preparation of black phosphorus. Key technical points: S1, Selecting a "Z-shaped" quartz tube as the reaction vessel; S2, Preparing an epitaxial growth substrate with lattice-inducing ability; S3, Loading the quartz tube with the high end as the raw material conversion zone and the low end as the epitaxial growth zone; wherein, loading the raw material conversion zone involves placing a mixed phosphorus source and mineralizer at the high end of the quartz tube; loading the epitaxial growth zone involves placing the substrate at the low end of the quartz tube; S4, After vacuum sealing the quartz tube, a seed layer is generated, and under the induction of the seed layer, black phosphorus grows laterally along the surface of the substrate; S5, Cooling the quartz tube to room temperature at a certain cooling rate to obtain a cooled black phosphorus film of a certain thickness.

The present application relates to a kind of perovskite precursor solution stability protection method, belong to perovskite photovoltaic technical field, solve the problem that perovskite precursor solution is easily affected by light, oxygen and water vapor and occurs degradation deterioration in the process of opening bottle use.The method of the present application is: perovskite precursor solution is stored in liquid storage container, perovskite precursor solution surface is covered with a layer of liquid protective layer formed by liquid protective agent;The absorbance A of liquid protective layer in 300~550 nm wave band is greater than or equal to 3.The present application forms threefold protection of light shielding, oxygen isolation and water vapor barrier through liquid protective layer, can continuously provide interface protection in the process of opening bottle and static storage, effectively improve the stability of perovskite precursor solution.

The application discloses a zeolite membrane for efficient separation of CO2 and a preparation method and application thereof. The zeolite membrane is prepared by encapsulating organic guest molecules (or ions) in the channels of the zeolite membrane, and then further regulating the structure and content of the organic guest molecules to obtain the zeolite membrane. Since the residual organic guest molecules have strong interaction with CO2, the diffusion rate of CO2 in the zeolite membrane is greatly reduced, and finally the efficient separation between CO2 and other gas mixtures can be realized. Compared with the conventional zeolite membrane, the zeolite membrane can be used for the separation of CO2 in various different mixture systems, and the application field is very wide, and the adaptability is greatly improved.

The invention relates to the technical field of membrane separation materials and discloses an SD membrane based on synergistic alcohol phase system interfacial polymerization and a preparation method of the SD membrane. The SD membrane has high flux, controllable desalination rate and excellent operation stability. The preparation method comprises the following steps: (1) adding a polymer into an organic solvent to obtain a mixed solution; (2) continuing to add a pore-foaming agent to obtain a precursor solution; (3) carrying out vacuum defoaming treatment on the precursor solution, and blade-coating the precursor solution on a carrier to obtain a base membrane; (4) sequentially infiltrating the base membrane into the synergetic alcohol phase system solution and the oil phase solution to perform polyamide treatment to obtain an SD membrane; the synergetic alcohol phase system solution comprises an interfacial polymerization amine monomer, a diffusion regulator, a network building agent and a functional copolymerization monomer; the diffusion regulator comprises monohydric alcohol of which the number of carbon atoms is less than or equal to 3; the network building agent comprises polyhydric alcohol with the number of carbon atoms smaller than or equal to 3 or a polymer of the polyhydric alcohol; the functional comonomer comprises an alcohol amine compound with the number of carbon atoms less than or equal to 4; the oil phase solution includes an interfacial polymerization acyl chloride monomer.

The invention discloses an organic semiconductor material, a preparation method, application and a perovskite solar cell, and belongs to the technical field of organic semiconductor materials and solar cells. An organic semiconductor material having a specially designed structure is provided. By introducing the rigid side arm structure, the conjugate length of the core unit is effectively prolonged, and the carrier transport capability of the hole transport material can be effectively enhanced; particularly, heteroatoms such as oxygen, sulfur and selenium contained in the rigid side arm structure can form a coordination effect with lead atoms in the perovskite, so that multiple effects of passivating defects, namely assisting the crystallization of the perovskite material and the like are achieved; when the perovskite solar cell is prepared, the rigid structure may slow down the aggregation of molecules in a solution and the diffusion rate on a substrate, so that the crystallization process is more uniformly regulated and controlled, the formation of a large-area, high-quality and low-defect-density perovskite thin film is facilitated, pinhole and grain boundary defects are reduced, and the performance of the perovskite solar cell is improved.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The invention provides a preparation method of a traditional Chinese medicine composition spice with a lasting fragrance emitting function. The preparation method comprises the following steps: (1) raw material pretreatment, (2) superfine grinding, (3) surface modification, (4) slow release agent preparation, (5) compounding and mixing, and (6) irradiation sterilization. Nanoscale pits are constructed through plasma surface modification to enhance the specific surface area, efficient controlled release and activity preservation of volatile components are achieved in combination with the synergistic effect of gradient heating inclusion and partitioned irradiation sterilization, and the fragrance emission duration is remarkably prolonged on the premise that the initial fragrance intensity is kept.

This application provides a silicon-carbon anode material, its preparation method, an anode sheet, and a battery. The silicon-carbon anode material includes a silicon-carbon matrix and a carbon coating layer covering at least a portion of the surface of the silicon-carbon matrix. The silicon-carbon matrix comprises porous carbon and silicon particles filling the pores of the porous carbon. In the silicon-carbon matrix, the mass percentage of the silicon particles increases radially from the inside out; and the average particle size of the silicon particles decreases radially from the inside out. This application can obtain a silicon-carbon anode material with both excellent electrochemical performance and low expansion rate.

The invention relates to the technical field of biomedical materials, in particular to iodinated oil emulsion gel with a slow release function and a preparation method of the iodinated oil emulsion gel. The invention provides iodinated oil emulsion gel with a slow release function, the iodinated oil emulsion gel comprises an oil phase, a water phase and magnetic response amphiphilic particles, the oil phase is prepared by compounding oleic acid modified magnetic nanoparticles and iodinated oil; the water phase is prepared by dissolving a medicine in deionized water; the magnetic response amphiphilic particles are prepared by carrying out amination modification treatment on magnetic nanoparticles. The preparation method comprises the following steps: preparing oleic acid modified magnetic nanoparticles, compounding the oleic acid modified magnetic nanoparticles with iodinated oil to obtain magnetic iodinated oil, synthesizing magnetic response amphiphilic particles through multiple steps, and matching the magnetic response amphiphilic particles with a drug-containing aqueous phase and a gel agent to successfully prepare iodinated oil emulsion gel with a slow release function, and the iodinated oil emulsion gel has good centrifugal stability.

The invention discloses antibacterial super absorbent resin and a preparation method thereof. The antibacterial super absorbent resin is prepared by surface post-treatment of a quaternary ammonium salt-epoxy functional polymer. Specifically, a quaternary ammonium salt monomer with double bonds and glycidyl methacrylate are subjected to free radical polymerization to form a polymer containing quaternary ammonium cations and active epoxy groups at the same time, then the polymer is subjected to spraying process post-treatment on polyacrylate super absorbent resin, so that the polyacrylate super absorbent resin and carboxyl of the resin are subjected to cross-linking reaction, and the super absorbent resin is obtained. A three-dimensional network structure is constructed on the surface of the resin, the problem of gel blockage of the super absorbent resin is solved, the saline water absorption rate, the absorption speed and the gel strength of the resin are remarkably improved, and meanwhile, the super absorbent resin is endowed with excellent broad-spectrum antibacterial performance by utilizing the synergistic effect of quaternary ammonium groups and epoxy groups; the antibacterial rates of the super absorbent resin prepared by the invention on escherichia coli, staphylococcus aureus and candida albicans are all greater than 99.9%, and the super absorbent resin belongs to a non-dissolution antibacterial material.