22 results about "Silica microsphere" patented technology

The invention relates to the technical field of cigarette materials, in particular to a silica microsphere with a core-shell structure and hierarchical pores as well as a preparation method and application of the silica microsphere. The preparation method of the silicon dioxide microspheres with the core-shell structure and the hierarchical pores comprises the following steps: 1) mixing a polyvinyl alcohol aqueous solution with nano silicon dioxide particles, and stirring to form floccules; (2) preparing the floccule obtained in the step (1) into a sphere, namely a core structure of the silicon dioxide microsphere; (3) wrapping the surface of the core structure prepared in the step (2) with a pre-mixed mixture of mesoporous silica particles and a pore-foaming agent to serve as a shell structure of the silica microsphere, so as to obtain the silica microsphere with the core-shell structure; and 4) performing heat treatment to form hierarchical pores in the core-shell structure of the silicon dioxide microsphere, thereby obtaining the silicon dioxide microsphere with the core-shell structure and the hierarchical pores. The silicon dioxide microsphere with the core-shell structure and the hierarchical pores has the hierarchical pores with different sizes, so that the fragrance carrying amount can be increased, and the slow release performance can be improved.

The invention relates to the technical field of polymer composite materials, in particular to a PTFE microwave composite dielectric substrate based on core-shell structure filler and a preparation method of the PTFE microwave composite dielectric substrate. The preparation method comprises the following steps: uniformly coating nano-diamond on the surfaces of hollow silicon dioxide microspheres by adopting an electrostatic self-assembly method to form a core-shell filler, then mixing the core-shell filler with polytetrafluoroethylene emulsion, and preparing the microwave composite dielectric material through calendaring molding and vacuum hot pressing methods. The nano-diamond shell layer can construct a continuous heat conduction network, and meanwhile the low dielectric constant characteristic brought by an internal hollow silicon dioxide structure is kept. In addition, the nano-diamond endows the hollow silicon dioxide microspheres with rough surfaces, and interface bonding between the hollow silicon dioxide microspheres and a polytetrafluoroethylene matrix is enhanced, so that thermal expansion is remarkably inhibited. The invention provides an effective way for solving the contradiction between the dielectric property and the thermal property of the polytetrafluoroethylene-based microwave composite dielectric material.

The invention provides an organic silicon microsphere preparation method and an organic silicon microsphere, which are used for solving the problem that the rigidity of a silicon dioxide microsphere in a flexible display is damaged so as to prepare the organic silicon microsphere with high elasticity and monodispersity. According to the method, dispersion polymerization and a sol-gel method are combined, a vinyl-containing organosilicon monomer, a base catalyst, a dispersing agent and an initiator are used, and the ratio of water to ethanol (the mass ratio is 4: 6-9: 1) is regulated and controlled to optimize the performance. Adding a dispersing agent and a monomer into the mixed solution, and stirring and clarifying under the protection of nitrogen; adding an initiator, stirring and dispersing; then reacting at 75-85 DEG C in a nitrogen atmosphere for more than 10 hours for polymerization; adding an alkali catalyst to adjust the pH value to 8-11, and carrying out stirring condensation at 18-40 DEG C; and finally, separating, washing and drying the microspheres. The stirring speed in the whole process is 250-400 rpm. According to the method, the elasticity and size of the microspheres can be adjusted through raw material selection and process control. The invention further provides the organic silicon microspheres prepared by the method, and the effectiveness of the organic silicon microspheres is verified by the embodiment.

The application provides a fluorescent structural color anti-counterfeiting material and a preparation method thereof, and the preparation method comprises the following steps: preparing composite fluorescent particles of mesoporous silica microsphere loaded halogen perovskite fluorescent particles CsPbX3, wherein X is Br, Cl or I; mixing the composite fluorescent particles with monodisperse silica nanoparticles, resin, a solvent, an initiator and an additive to obtain a mixture, wherein the volume percentage of each component in the mixture is as follows: 25-65% of the nanoparticles, 35-75% of the resin, 0.01-10% of the initiator, and 5-90% of the solvent, and the mass of the composite fluorescent particles is 0.01-3% of the mass of the silica nanoparticles; performing rotary evaporation on the mixture under vacuum to obtain concentrated paint, and after photocuring or thermal curing, the anti-counterfeiting material is obtained. The anti-counterfeiting material of the technical scheme has the dual anti-counterfeiting effects of structural color anti-counterfeiting under natural light and fluorescent anti-counterfeiting under ultraviolet excitation.

The invention belongs to the field of functional coatings, and particularly relates to a wave-transparent coating with an ultralow infrared radiation characteristic and a preparation method of the wave-transparent coating. The coating is composed of a functional filler, matrix resin and an auxiliary agent according to a specific ratio, wherein the functional filler adopts a core-shell structure design of flaky aluminum powder and hollow silicon dioxide microspheres. The preparation method mainly comprises the following three key steps: synthesis of the functional filler, preparation of the wave-transparent coating with the ultralow infrared radiation characteristic, and implementation of the process. Compared with the prior art, by designing the sheet-shaped Al-coated SiO core-shell structure with the low dielectric property, the technical problem that traditional metal aluminum powder cannot give consideration to both low infrared emissivity and high radar wave transmissivity due to the high dielectric property is solved. Finally, the infrared emissivity of the coating in the wave bands of 3-5 microns and 8-14 microns is smaller than or equal to 0.3, the wave transmission rate in the X / Ku radar wave band is larger than or equal to 90%, and integrated application of infrared stealth and wave transmission performance is achieved.

The invention belongs to the technical field of nano coatings, and particularly relates to a self-cleaning nano coating for a photovoltaic panel in an alpine region and a preparation method of the self-cleaning nano coating. The coating comprises a base layer and a super-hydrophobic photo-thermal layer covering the base layer; the base layer comprises a silane coupling agent and nano titanium dioxide sol; the super-hydrophobic photo-thermal layer comprises low-surface-energy substance modified multistage micro-nano rough silicon dioxide and near-infrared absorption type tungsten bronze nanoparticles, the multistage micro-nano rough silicon dioxide comprises silicon dioxide microspheres with the particle size of 200-500 nm, and silicon dioxide nanospheres with the particle size of 50-80 nm are attached to the surfaces of the silicon dioxide microspheres. In the invention, the multistage micro-nano rough silicon dioxide has higher mechanical stability and is not easy to integrally lose efficacy when being stressed, and when the multistage micro-nano rough silicon dioxide is extruded by ice crystals, each silicon dioxide nanosphere generates tiny displacement and deformation to dissipate stress instead of fracture caused by complete rigid resistance; the near-infrared absorption type tungsten bronze nanoparticles generate heat, so that the thickness of a water film between ice and the coating is increased, and the adhesive force of an ice layer is reduced.

This invention belongs to the field of nano-coating technology, specifically a self-cleaning nano-coating for photovoltaic panels in high-altitude and cold regions and its preparation method. The coating includes a base layer and a superhydrophobic photothermal layer covering the base layer. The base layer includes a silane coupling agent and nano-titanium dioxide sol. The superhydrophobic photothermal layer includes multi-level micro / nano-roughened silica modified with low surface energy materials and near-infrared absorbing tungsten bronze nanoparticles. The multi-level micro / nano-roughened silica includes silica microspheres with a particle size of 200-500 nm, and silica nanospheres with a particle size of 50-80 nm are attached to the surface of the silica microspheres. In this invention, the multi-level micro / nano-roughened silica has higher mechanical stability and is less prone to overall failure under stress. When subjected to ice crystal compression, each silica nanosphere undergoes slight displacement and deformation to dissipate stress, rather than completely rigidly resisting fracture. The near-infrared absorbing tungsten bronze nanoparticles generate heat, increasing the thickness of the water film between the ice and the coating, and reducing the adhesion of the ice layer.

This application provides a superhydrophobic and antifouling wall paint and its preparation method. The superhydrophobic and antifouling wall paint comprises the following raw materials in parts by weight: 100 parts by weight of water-based styrene-acrylate emulsion, 5-15 parts by weight of modified hollow silica microspheres, 10-30 parts by weight of pigment, 15-30 parts by weight of filler, 0.1-0.2 parts by weight of defoamer, 1-3 parts by weight of film-forming aid, 0.1-0.3 parts by weight of pH adjuster, and 10-30 parts by weight of water. One side of the modified hollow silica microspheres is grafted with a fluorosilane coupling agent, and the other side is grafted with an oxygen-based silane coupling agent. This application, by partially hydrophobically modifying the hollow silica microspheres, causes them to migrate directionally and accumulate on the coating surface during film formation, thus endowing the coating with excellent superhydrophobic self-cleaning and antifouling properties.

This invention provides a polyimide composite film, its preparation method, and its application, belonging to the field of polyimide material technology. First, under an inert atmosphere, a first diamine monomer and a second diamine monomer are mixed in a solvent, and a dianhydride monomer is added to carry out a polycondensation reaction to obtain a polyamic acid solution. Then, a pore-forming agent or hollow silica microspheres are added to the polyamic acid solution, followed by thermal imidization curing to obtain the polyimide composite film. This invention introduces an air phase into the matrix by adding a pore-forming agent or hollow silica microspheres to the polyamic acid solution, resulting in a polyimide composite film with excellent low dielectric constant, low dielectric loss, and low coefficient of thermal expansion. The dielectric constant can be as low as 2.13 at 10 MHz, and the average coefficient of thermal expansion can be reduced to 21.97 ppm / K in the range of 5–150 °C.

The invention relates to a preparation method of a graded porous Murphy material based on cooperation of microfluidics, ink-jet printing and emulsion evaporation, and solves the technical problems that an existing preparation method of the graded porous Murphy material is harsh in condition, the porosity is difficult to regulate and control, and the prepared porous material is unstable in pore structure and low in uniformity. Silicon dioxide nano particles are introduced into an emulsion dispersion phase, self-assembly of the nano particles is driven by utilizing cohesion force generated by preferential evaporation of the dispersion phase, a silicon microsphere single-layer structure in hexagonal arrangement is formed, macroscopic pores are formed among microspheres, mesoscopic pores are formed among nano particles in the microspheres, and finally the graded porous Murphy material is obtained.

The application belongs to the technical field of structural color, and discloses a method for repeatedly constructing structural color on thermoplastic plastic and application. Nano-silica microspheres are deposited on a thermoplastic plastic substrate, and an ordered and periodic photonic crystal structure is formed through self-assembly, presenting structural color. The thermoplastic plastic substrate with the deposited photonic crystal is placed into a flat vulcanizing machine for heating and pressing, so that the photonic crystal structure and the structural color presented thereby are firmly attached to the thermoplastic plastic substrate. The thermoplastic plastic substrate with the firmly attached structural color is again placed into the flat vulcanizing machine for heating and pressing, so that the attached structural color is faded, and thus the thermoplastic plastic substrate with faded color can be colored again. The structural color obtained by the application has high color fastness, can be repeatedly colored, has the angle color change characteristic, is simple, fast, effective, green and environment-friendly, and can be applied to the fields of dyeing, decoration and anti-counterfeiting, and provides a feasible method for replacing the use of traditional dyes.

The application belongs to the technical field of structural color, and discloses a method for repeatedly constructing structural color on thermoplastic plastic and application. Nano-silica microspheres are deposited on a thermoplastic plastic substrate, and an ordered and periodic photonic crystal structure is formed through self-assembly, presenting structural color. The thermoplastic plastic substrate with the deposited photonic crystal is placed into a flat vulcanizing machine for heating and pressing, so that the photonic crystal structure and the structural color presented thereby are firmly attached to the thermoplastic plastic substrate. The thermoplastic plastic substrate with the firmly attached structural color is again placed into the flat vulcanizing machine for heating and pressing, so that the attached structural color is faded, and thus the thermoplastic plastic substrate with faded color can be colored again. The structural color obtained by the application has high color fastness, can be repeatedly colored, has the angle color change characteristic, is simple, fast, effective, green and environment-friendly, and can be applied to the fields of dyeing, decoration and anti-counterfeiting, and provides a feasible method for replacing the use of traditional dyes.

This invention discloses a low-dielectric wire harness and its preparation method, relating to the field of polyethylene cable technology and belonging to patent classification number H01B13 / 012. The method includes: performing a free radical grafting reaction between plasma-activated high-density polyethylene and dodecafluoroheptyl methacrylate and vinyltriethoxysilane to obtain fluorosilicone co-grafted modified polyethylene; preparing hollow silica microspheres using calcium carbonate as a template and amination; compounding organic intercalated montmorillonite with the amination hollow silica microspheres using a bridging agent and then surface fluorinating to obtain fluorinated hollow silica-montmorillonite composite filler; mixing and melt-extruding a mixture of fluorosilicone co-grafted modified polyethylene, ethylene-octene copolymer, maleic anhydride grafted polyethylene, composite filler, polyethylene wax, dimethyl silicone oil, antioxidant, and calcium stearate to obtain granules; and finally, melt-coating the granules onto the surface of a copper core conductor to obtain a low-dielectric wire harness. This invention significantly reduces the dielectric constant and dielectric loss of the wire harness and exhibits good moisture resistance and stability.

The invention belongs to the technical field of electroforming, and particularly relates to an electroforming knotless screen scraper surface roughness surface composite electroforming technology which comprises the following steps: preparing an electroforming solution which comprises nickel sulfate, nickel chloride, boric acid, surface modified silicon dioxide microspheres, a dispersing agent, a primary brightener, a secondary brightener, a stress relieving agent and a pH regulator; by introducing the surface modified silicon dioxide microspheres, the surface roughness of the electroforming layer is improved; the uniform electroforming of the knotless screen scraper surface is realized by controlling the components and process parameters of the electroforming solution, and the method has the effects that the traditional cloud point emulsification process is replaced by introducing monodisperse 4-10 [mu] m microspheres as a nucleation template, and the accurate control of the pit structure is realized through microsphere templating.

This invention belongs to the field of optical materials technology and discloses a multilayer optical functional coating, its preparation method, and its application. The multilayer optical functional coating comprises, from the inside out, an anti-reflective layer, an anti-glare layer, and an anti-fingerprint layer sequentially disposed on the surface of a transparent substrate. The anti-glare layer is prepared from low-refractive-index sol and hollow silica microspheres, with the hollow silica microspheres dispersed in the low-refractive-index sol. This invention introduces an anti-glare layer containing hollow silica microspheres onto the anti-reflective layer and controls the content of the hollow silica microspheres to limit the gloss of the anti-glare layer within a reasonable range. This achieves low reflection and anti-glare performance while maintaining good display clarity. Furthermore, an anti-fingerprint layer is superimposed on its surface to improve surface wettability.

In order to solve the problem of serious performance attenuation caused by filler-resin interface failure in the long-term use process of an existing PVB intermediate film, the invention provides the multifunctional composite particle modified PVB laminated glass intermediate film and the laminated glass, and the intermediate film comprises a core functional layer and surface bonding layers symmetrically arranged on the two sides; the core functional layer contains interface reinforced composite particles; the interface reinforced composite particle has a core-shell structure, the core is a porous silicon dioxide microsphere, the shell is a rare earth element doped silicon-aluminum oxide layer, and the surface of the shell has a microscopic coarse structure and is grafted with a silane coupling agent containing an active functional group. The haze change rate of the intermediate film is less than or equal to 5.2% after the intermediate film is subjected to double-85 aging for 1000 hours, so that perfect balance between high tensile strength and good sound insulation is realized on the premise of extremely low haze, and strict requirements of high-end application on comprehensive performance are met.

This invention relates to a carboxyl-based magnetic silica microsphere with controllable particle size, its one-step preparation method, and its applications, belonging to the field of magnetic material preparation technology. This invention uses Fe3O4 magnetic particles as the magnetic core, with a silica layer coated on the core surface. Carboxyl groups are grafted onto the surface using aminosilane compounds and diacid compounds as functionalizing agents to obtain Fe3O4@SiO2-COOH composite microspheres. The particle size of the carboxyl-based magnetic silica microspheres is 0.5 μm-10 μm. The preparation method of this invention is simple, highly controllable, and time-efficient. The particle size of the prepared magnetic silica microspheres can be controlled between the nanometer and micrometer levels, and it can also be used for large-scale production. The prepared microspheres have good dispersibility, high magnetic content, and high carboxyl content, and can specifically bind to proteins, which can be further used for the separation of proteins and other biomolecules.

The application belongs to the technical field of sensors and the field of electrochemical analysis, and relates to a magnetic floating and non-immobilized electrochemical immunosensor, a preparation method and application thereof. The electrochemical immunosensor comprises a floating probe, a magnetic signal reporting probe and a magnetic electrode. The floating probe is formed by connecting hollow silica microspheres and a capture antibody 1. The magnetic signal reporting probe is composed of a magnetic mesoporous silica, a signal molecule and a capture antibody 2. The target biomarker is specifically combined with the capture antibody 1 and the capture antibody 2 to form a sandwich immunocomplex. The sandwich immunocomplex and the remaining free floating probe are separated and removed by buoyancy. The remaining free magnetic signal reporting probe is collected by magnetic separation. The magnetic electrode is matched with the remaining free magnetic signal reporting probe collected by magnetic separation. The electrochemical immunosensor provided by the application has the advantages of simple assembly process, simple operation, high sensitivity, good specificity, low cost and the like, and can realize quantitative detection of early biomarkers.

The invention discloses a preparation method of a composite wave-absorbing material and the composite wave-absorbing material.The method comprises the steps that Ti3C2Tx powder and polydopamine modified silicon dioxide microspheres are provided, the Ti3C2Tx powder and the polydopamine modified silicon dioxide microspheres are mixed and stirred in a solvent and then settled, and a first precipitate is obtained; and washing and drying the first precipitate to obtain first powder. Performing high-temperature carbonization treatment on the first powder in an inert gas environment through a high-temperature carbonization method to obtain a first carbide; and providing a silicon dioxide etching solution, and adding the first carbide into the silicon dioxide etching solution to obtain a second carbide from which the silicon dioxide component is removed. And washing and drying the second carbide to obtain the composite wave-absorbing material. The composite wave-absorbing material has a synergistic effect of multiple loss mechanisms, so that electromagnetic waves are fully absorbed. And the nitrogen-doped hollow carbon structure alleviates impedance mismatch caused by high conductivity of Ti3C2Tx, and improves the wave-absorbing performance of the composite wave-absorbing material.

The invention discloses a microsphere directional driving method and system based on wall cavitation bubbles. According to the method, laser is used for inducing cavitation of bubbles on a photothermal conversion substrate, and the sizes of the bubbles and the relative positions of the bubbles and silicon dioxide (SiO2) microspheres are regulated and controlled, so that an asymmetric flow field formed in the growth and collapse processes of the bubbles generates controllable thrust on the microspheres, and directional driving is realized. The method comprises the following steps: providing a photothermal conversion substrate and placing microspheres, irradiating a target position of the substrate by laser to generate cavitation bubbles, and adjusting the sizes of the bubbles and the distance between a bubble nucleation point and the microspheres to realize one-way or reciprocating motion of the microspheres. The system is composed of a laser device with energy adjustment and position regulation and control functions, a photothermal conversion substrate and microspheres on the surface of the photothermal conversion substrate. The device is driven based on fluid dynamics, is irrelevant to a microsphere material, is simple in structure, is easy to integrate, and is suitable for micro-nano scenes such as microfluidics, biological particle control, micro-assembly and the like.

The embodiment of the application provides a solid waste-based high-temperature heat storage composite material based on gradient interface engineering and nanowire reinforcement and a preparation method thereof, which comprises a porous framework, a phase change core material and a gradient reinforcement layer; the porous framework is a composite of one or both of alumina microspheres and silica microspheres, and the inside of the porous framework is a network structure that penetrates each other; the phase change core material is coated on the surface of the porous framework; and the gradient reinforcement layer comprises a vertical array of boron nitride nanosheets on the outer layer and silicon carbide nanowires on the inner layer. The application aims to utilize coal gangue solid waste, solve the problems of high-temperature phonon scattering and interface separation through in-situ synthesis of SiC nanowires and BN gradient interface structure, break through the dispersion and high-temperature stability bottleneck of the traditional filler adding method, and thus realize the high performance and environmental protection and economy of the solid waste-based high-temperature heat storage material.

The application discloses a kind of mesoporous silica microsphere coated Cr 3+ The application discloses a doped gallium oxide near-infrared fluorescent powder and a preparation method thereof, and belongs to the technical field of luminescent material preparation. 2‑x Cr x O3@SiO2, wherein 0.002 ≤ x≤ 0.010. The near-infrared fluorescent powder is obtained by crystalline growth of Ga 2‑ x Cr x O3 inside mesoporous silica, and due to the limited growth effect of mesoporous silica, the application can efficiently synthesize SiO2-coated Ga 2‑x Cr x O3 near-infrared fluorescent powder, the preparation method is green and environmentally friendly, the micro size and morphology of the obtained fluorescent powder are controllable, the wavelength of the emission spectrum is 650-900 nm, and the fluorescent powder has good full peak half-width and is suitable for application in a near-infrared fluorescent conversion light-emitting diode.