612 results about "Fiber diameter" patented technology

The present invention relates to the technical field of flexible electronics, and relates to a breathable and stretchable circuit capable of being activated by imprinting, and a preparation method therefor and a use thereof. The preparation method for the breathable and stretchable circuit capable of being activated by imprinting in the present invention comprises the following steps: dissolving a thermoplastic polymer in a solvent, adding liquid metal particles, and mixing and dispersing to obtain a mixed solution; carrying out electrospinning on the obtained mixed solution to prepare a nanofiber membrane; and using a stamping model having a circuit pattern to stamp the obtained nanofiber membrane so as to obtain the breathable and stretchable circuit capable of being activated by imprinting. The present invention ensures the breathability and the stretchability by using the nanofiber membrane. The liquid metal particles match fibers in diameter, and therefore, liquid metal in nanofibers can be overflowed by means of imprinting to form a conductive path, achieving high-precision preparation of circuits.

The invention relates to a micro-nano mullite reinforced zirconium oxide inorganic fiber, the phase of the micro-nano mullite reinforced zirconium oxide inorganic fiber is composed of two phases of tetragonal zirconium oxide and mullite, the fiber diameter is 0.1-1.5 [mu] m, and crystal phase stability, microstructure stability and fiber flexibility are maintained at the temperature from room temperature to high temperature of 1400 DEG C. The preparation method comprises the following steps: taking acidic aluminum sol, silica sol, zirconium sol and yttrium salt as metal sources, taking a high-molecular polymer as a spinning auxiliary agent, obtaining micro-nano mullite reinforced zirconium oxide precursor fibers through an electrostatic spinning technology, and carrying out heat treatment on the precursor fibers to obtain the mullite reinforced zirconium oxide inorganic fibers. The invention has the advantages of wide raw material source, cheap raw materials, stable system, good spinnability, high solid content, simple preparation process and the like. The prepared inorganic fiber has good high-temperature stability and flexibility in a wide temperature range from room temperature to high temperature of 1400 DEG C, and has application prospects in the fields of aerospace vehicle flexible heat insulation felts, high-temperature crystal growing furnaces and other high-temperature flexible heat insulation and heat preservation.

The invention provides a microporous refined low-resistance-consumption fiber membrane and a preparation method and application thereof.The method comprises the following steps that S1, polylactic acid is dissolved in a solvent A according to a specific proportion, a proper amount of solvent B is added, and a modified spinning mixed solution is prepared by optimizing the fiber diameter; s2, dissolving a metal salt and a connecting agent in a solvent C and a solvent D to prepare a metal organic framework (MOF) precursor solution; s3, preparing MOF nanosheets from the MOF precursor solution obtained in the step S2 through a wet chemical synthesis method; and step S4, preparing the microporous refined low-resistance-consumption fiber membrane from the modified spinning mixed solution obtained in the step S1 and the MOF nanosheets obtained in the step S3 through a spinning technology. The fiber membrane prepared by the invention has a series of advantages of higher specific surface area, lower resistance consumption, high gas adsorption capacity, stable filtering efficiency and the like, and is a filtering material which is wide in application field and excellent in performance.

A high-content stretchable silica aerogel composite fiber, prepared by the following method: 1) preparing a silica aerogel composite fiber precursor by means of coaxial melt spinning; 2) thermally stretching the silica aerogel composite fiber precursor; and 3) hot-pressing and sealing fibers into bamboo joints. Silica aerogel composite fibers of different diameters can be prepared by adjusting the diameter of the hollow fiber, and the warmth retention properties of the fiber can still be kept unchanged after 10,000 times of cyclic stretching with 100% strain.

Provided is a versatile nonwoven fabric having excellent heat resistance and mechanical strength and applicable to applications requiring heat resistance; or a nonwoven fabric having excellent heat resistance, mechanical strength, and permeability. Moreover, provided is a separator for electrochemical elements having excellent heat resistance and mechanical strength. Furthermore, provided is a membrane support having excellent heat resistance, mechanical strength, and ion permeability.The nonwoven fabric of the present invention comprises a polymethylpentene component and a polyethylene component, wherein the polyethylene component is fused, and wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric. The separator for electrochemical elements of the present invention comprises the nonwoven fabric. Another nonwoven fabric of the present invention comprises core-sheath composite fibers having a polyethylene component as a sheath component and a polymethylpentene component as a core component, wherein the polyethylene component as the sheath component of the core-sheath composite fiber is fused, wherein the polymethylpentene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, and the polyethylene component accounts for 30% by volume or more of the total fibers constituting the nonwoven fabric, wherein a thickness of the nonwoven fabric is 100 μm or less, and the nonwoven fabric has a direction with a tensile strength per mass per unit area of 2.0 N / 5 cm-width or more, or wherein a ratio (L / D) of a fiber diameter (D, unit: μm) to a length (L, unit: μm) of the core-sheath composite fiber is 350 or more. The membrane support of the present invention comprises the other nonwoven fabric.

The invention relates to the technical field of biomedical material manufacturing, and particularly discloses a gradient composite scaffold 3D printing process based on AI topological optimization, which comprises the following steps: a) based on medical image data of a patient, generating a digital model with porosity gradient distribution of 20-200 [mu] m and PCL / MCC material proportion gradient change through AI topological optimization; b) a double-nozzle FDM system is adopted to implement gradient printing, the layer thickness is 50 microns, the material switching frequency is 20 Hz, and the gradient resolution is 5% / layer; c), an electrostatic spinning nanofiber layer is deposited after FDM printing of each layer, the fiber diameter is 500 + / -50 nm, and the deposition density is 10-20 g / m. The method has the beneficial effects that through finite element analysis verification, the AI topological optimization enables the matching degree of the porosity and the component gradient of the stent and the natural bone to be greater than 90%, the mechanical distribution is more uniform, and the stress concentration is avoided; by adopting a double-nozzle FDM (20Hz switching frequency) and electrostatic spinning composite process, the interlayer shear strength is improved to 5.8 MPa, and the problem of traditional interface layering is solved.

The present invention belongs to the field of preparation of nanofiber composite fabrics. The present invention provides a nanofiber high moisture permeability waterproof fabric with multi-level interconnected channels and a preparation method thereof. The fabric body includes an outer layer, an intermediate layer and an inner layer. The outer layer is a pure polyester waterproof fabric that has been waterproofed, the intermediate layer is a nanofiber membrane with multi-level interconnected channels, and the inner layer is a pure polyester fabric; the inner side of the outer layer of pure polyester waterproof fabric is bonded to the hydrophobic polyvinyl alcohol nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding, and the inner layer of pure polyester fabric is bonded to the hydrophilic polyurethane nanofiber membrane of the intermediate layer of nanofiber membrane with multi-level interconnected channels through hot melt adhesive compounding. The nanofiber membrane with multi-level interconnected pores in the middle layer is composed of multiple nanofiber membrane layers stacked in sequence. Each nanofiber membrane layer has two layers of nanofiber membranes with different fiber diameters, one layer is a hydrophilic polyurethane nanofiber membrane, and the other layer is a hydrophobic polyvinyl alcohol nanofiber membrane. The nanofibers of the two membranes between and within the multi-level nanofiber membrane layers are cross-connected to form a three-dimensional structure with multi-level interconnected pores. The pore size gradually decreases from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m 2 24h), the hydrostatic pressure is higher than 60kPa.

The invention discloses an intelligent analysis and self-adaptive regulation and control system for a glass fiber wiredrawing forming process, which relates to the technical field of high silica glass fiber product processing and comprises a multi-modal data acquisition unit, a process prediction model unit, a reference process model unit, a self-adaptive regulation and control decision unit and a control execution unit. By introducing the prediction model and the self-adaptive decision-making unit, two strong coupling parameters of speed and temperature can be decoupled, collaborative optimization regulation and control are carried out, precise control over the wire drawing process is achieved, the uniformity of the fiber diameter is remarkably improved, the future process trend can be predicted on the basis of real-time data, and the method has good application prospects. Traditional feedback control is improved into predictive feedforward control, fine adjustment is carried out before process parameters are obviously deviated, the rate of finished products is greatly improved, meanwhile, the optimal production process is solidified into a reference model, complex regulation and control logic is precipitated into a decision algorithm, and dependence on artificial experience is eliminated.

The present application relates to a kind of superfine alkali earth hexaaluminate inorganic fiber and its preparation method, the diameter of the alkali earth hexaaluminate inorganic fiber described is 0.1 μm-3.0 μm, and it is continuously adjustable in this range, the prepared alkali earth hexaaluminate fiber keeps fiber flexibility in the temperature range of room temperature to high temperature 1300 DEG C, and keeps fiber crystal phase stability and fiber form integrity at high temperature 1400 DEG C.The preparation method is to mix aluminum sol, alkali earth salt, high molecular polymer and dissolve in water to obtain sol, then electrospinning precursor fiber is obtained, and the precursor fiber is obtained by high-temperature heat treatment to obtain alkali earth hexaaluminate inorganic fiber.The present application has low cost, and fiber structure stability is good, has wide application prospect in the fields such as catalyst, catalyst carrier, fiber structure reinforcement, heat insulation and the like.

This invention relates to a rare earth aluminate inorganic fiber and its preparation method, wherein the main crystalline phase of the rare earth aluminate is composed of ReAl. 11 O 18 Composed of ReAlO3 (Re = La, Ce, Pr, Nd), the relative content of the two phases is continuously adjustable within the range of 0–100 wt%. The fiber diameter ranges from 0.2 μm to 6.0 μm. The fiber maintains flexibility under high-temperature conditions from room temperature to 1450℃ and maintains microstructure and crystalline phase stability from room temperature to 1650℃. The preparation method uses aluminum sol as the aluminum source, rare earth salts as the rare earth source, and a polymer as a spinning aid. Precursor fibers are obtained by electrospinning or centrifugation, and the precursor fibers are then heat-treated to obtain rare earth aluminate inorganic fibers. This invention features sol stability, good spinnability, simple preparation process, and low cost. The prepared inorganic fibers have a stable and controllable structure, intact morphology, and good flexibility, showing promising applications in thermal insulation, flexible electronics, flue gas dust removal, and battery separators.

The invention belongs to the field of resin preparation, and particularly relates to organic silicon modified phenolic resin as well as a preparation method and application thereof. The preparation method of the organic silicon modified phenolic resin comprises the following preparation steps: mixing a phenolic compound and an aldehyde compound, adding divalent metal salt into the mixture, uniformly stirring and mixing, adjusting the pH value of a reaction system, adding an organic silicon modifier, uniformly mixing, heating to react, adjusting the pH value of the system, washing and drying a product, thereby obtaining the organic silicon modified phenolic resin. The organic silicon modified phenolic resin is obtained. The prepared organic silicon modified phenolic resin is moderate in molecular weight, molecular weight distribution and specific viscosity and very good in spinnability; the fiber is prepared into a melt-blown non-woven material, and the melt-blown non-woven material is ultra-small in fiber diameter, high in porosity and small in pore diameter; and the melt-blown non-woven material also has the advantages of low thermal shrinkage rate, high residual carbon rate, excellent flame retardant property, thermal insulation property, good thermal protection property and long service life.

The invention discloses an ultra-wideband heterogeneous five-core anti-resonance optical fiber for transmission from ultraviolet to intermediate infrared, and belongs to the technical field of optical fiber communication. The heterogeneous five-core anti-resonance optical fiber sequentially comprises a perfect matching layer, an outer cladding layer, a first light guide unit, a second light guide unit, a third light guide unit, a fourth light guide unit and a fifth light guide unit from outside to inside along the fiber diameter, wherein the first light guide unit, the second light guide unit, the third light guide unit, the fourth light guide unit and the fifth light guide unit are arranged in the outer cladding layer. A plurality of nesting tube assemblies and gap tube assemblies with the same or different structures are arranged in each light guide unit in the circumferential direction at equal intervals, and a central air fiber core area, a left upper air fiber core area, a right lower air fiber core area, a right upper air fiber core area and a left lower air fiber core area are defined by the assemblies and work at the wave bands of 0.15-2.0 m, 2.0-3.0 m, 3.0-4.0 m, 4.0-6.0 m and 6.0-7.0 m correspondingly. And all the components show extremely low restrictive loss, dispersion close to zero and a relatively low nonlinear coefficient.

A problem to be addressed by the present invention is to provide a carbon fiber bundle capable of efficiently transiting the tensile strength of the fiber to a carbon fiber-reinforced composite material formed using the carbon fiber bundle, the carbon fiber bundle including a sizing agent added thereto, wherein the tensile strength of resin-impregnated strands (tensile strength A' of resin-impregnated strands) of the carbon fiber bundle is 5.0 GPa or more and 6.0 GPa or less, as evaluated on the basis of JIS R7608 (2007) using Resin Formulation A below; wherein the tensile strength of resin-impregnated strands (tensile strength B' of resin-impregnated strands) of the carbon fiber bundle is 4.7 GPa or more and 5.5 GPa or less, as evaluated on the basis of JIS R7608 (2007) using Resin Formulation B below; wherein the ratio of the tensile strength B' of resin-impregnated strands to the tensile strength A' of resin-impregnated strands is 85% or more; and wherein the single-fiber diameter of the carbon fiber bundle is 6.0 µm or more; Resin Formulation A: "CELLOXIDE (registered trademark)" 2021P, boron trifluoride monoethyl amine, and acetone are used at a ratio of 100:3:4 (parts by mass), and the curing conditions of a normal pressure, a temperature of 125°C, and a time of 30 minutes are used; and Resin Formulation B: "JER (registered trademark)" 828, dicyandiamide, and 3-(3,4-dichlorophenyl)-1,1-dimethylurea are used at a ratio of 100:6.3:2 (parts by mass), and the curing conditions of a normal pressure, a temperature of 130°C, and a time of 90 minutes are used.

The invention discloses a gradient thermal response composite nanofiber diaphragm and a preparation method thereof. The composite nanofiber diaphragm is composed of three functional layers: a) a surface layer: a low-density polyimide nanofiber layer (porosity is 60%-80%), and doped nano zirconium dioxide (5-10 wt%) improves the wettability of an electrolyte; b) a middle layer: polyimide / boron nitride nanosheet composite fibers (the content of boron nitride is 15-20wt%) form a three-dimensional heat conduction network; c) a bottom layer: a thermally induced phase change layer (polyimide and phase change microcapsule co-spinning) which triggers a hole closing effect at 160 DEG C; an in-situ electrostatic spinning composite process: adopting a coaxial nozzle for synchronous spinning; injecting a polyimide spinning solution containing boron nitride into an inner layer, and injecting a phase change microcapsule suspension into an outer layer; and an electric field gradient control technology (the voltage is gradually reduced from 25kV to 18kV) is introduced, so that the gradient distribution of the fiber diameter from 80nm to 200nm is realized. Through the innovative structural design and the advanced preparation process, the safety, the performance and the reliability of the lithium ion battery under the high-temperature working condition are remarkably improved, and important technical support is provided for the development of the high-performance lithium ion battery. The 180 DEG C thermal shrinkage rate of the product is less than 2% (reduced by more than 40% compared with the prior art); and the bottom layer closed hole response time during thermal runaway is less than 8 seconds (the traditional diaphragm is more than 15 seconds).

To provide a liquid crystal polymer composition that exhibits excellent compoundability and enhanced thermal conductivity while maintaining mechanical strength, toughness, fluidity, and heat resistance of a liquid crystal polymer.SOLUTION: A liquid crystal polymer composition of the present invention comprises a liquid crystal polymer, a plate-like filler having an aspect ratio of 3 or more, a glass fiber having an average fiber diameter of 5 to 15 μm, and a polybenzazole fiber having an average fiber diameter of 5 to 15 μm.SELECTED DRAWING: None

The invention discloses a polyamide cable material as well as a preparation method and application thereof. The cable material is prepared from the following raw materials in parts by weight: 100 parts of polyamide, 10 to 40 parts of nano magnesium hydroxide whisker, 1 to 5 parts of silane coupling agent, 1 to 5 parts of amphiphilic block copolymer, 1 to 10 parts of pentaerythritol triacrylate and 1 to 5 parts of antioxidant, wherein the fiber length of the nano magnesium hydroxide whisker is 200 to 1000 nm, and the fiber diameter of the nano magnesium hydroxide whisker is 30 to 80 nm. The polyamide cable material has good temperature resistance (can tolerate the high temperature of 135 DEG C for a long time), flame retardance (the limit oxygen index can reach 31% or above, preferably 33.5%), mechanical properties (excellent tensile strength and low-temperature impact resistance) and relatively high volume resistivity.

A method of forming rotary fibers (e.g., glass fibers) that have a more uniform or constrained fiber diameter and / or length distribution is disclosed. The rotary fibers having the improved property distribution(s) promote the formation of improved non-woven fibrous mats and products formed from the mats (e.g., a facer for a ceiling tile). Because of the more uniform / consistent non-woven mat, the ceiling tile facer can have fewer visual defects.

To provide an artificial leather that has high-quality appearance, and is thin, highly strong, and flexible so as to be easily molded along a shape.SOLUTION: An artificial leather includes, as a main component, fibers including a polyester-based resin as a primary component. The fibers are long fibers. The average single fiber diameter of the fibers is 2.0 μm or more and 7.0 μm or less. The fibers are crimped fibers having curvature of 5 to 20%. The fibers are dispersed as single fibers in the artificial leather.SELECTED DRAWING: Figure 1

Provided is a metal fiber laminate which can be made into a non-woven fabric even with fine metal fibers, and which has excellent texture (surface morphology), interlaced state, high density, smoothness, and air permeability. The metal fiber laminate is characterized in that the metal fiber laminate comprises at least three layers including a double metal fiber layer (A) having a fiber diameter of 6 [mu] m or more and a metal fiber layer (B) located between the double metal fiber layers (A) and having a fiber diameter of less than 6 [mu] m, the metal fiber laminate is laminated and integrated by a water jet, and the outer surface of the metal fiber laminate has an uneven structure.

The invention provides a high-precision simulation method for filtering performance of a mining dustproof mask fiber structure. The high-precision simulation method comprises the following steps: establishing a randomly distributed fiber aggregate model; a transient state is activated in Fluent, a turbulence model Realizable k-epsilon is selected, the pressure drop of a mining dust mask and the flow field characteristics of nanoscale fiber gaps are simulated and predicted, a DPM model is activated, the migration track of 0.3-10 [mu] m inhalable particles is tracked, and the dust trapping process of a fiber structure is simulated in the transient state environment. By simulating the influence of different fiber diameters, fiber volume fractions, airflow flows and the like on the filtering performance of the fiber structure of the mining dust mask, the research and development of the high-filtering-performance mining dust mask can be guided in a targeted manner, and the influence of the internal fiber structure of the dust mask on the filtering performance of the dust mask is mastered.

There is provided a method for producing a product by cells, the method including filtering a cell broth through a porous membrane to obtain a product by the cells, in which the porous membrane has a liquid contact surface having at least any one selected from the group consisting of an opening ratio of 57.5% or less, a pore diameter having a coefficient of variation of 0.5 or less, and a ratio of pore diameter / fiber diameter of 1.3 or less, and the liquid contact surface has at least any one selected from the group consisting of a structural anisotropy of 0.97 or more and 1.03 or less and a ratio of long pore diameter / short pore diameter of 1.8 or less, and a shear stress due to a flow of the cell broth on the liquid contact surface is set to 4.0 N / m2 or less.

This film-forming composition for skin contains the following components (A) to (E). A phospholipid (A) A sterol ester (B) A C10-24 higher alcohol (C) Water (D) Water-insoluble fibers (E) having an average fiber diameter of 0.3 μm to 5 μm and an average fiber length of 20 μm to 300 μm In the film-forming composition for skin, the mass ratio (B) / (E) of component (B) to component (E) is 1 to 15. The water-insoluble fibers of component (E) preferably have a variation coefficient value of the fiber length of 40% to 100%.

A method for forming spin fibers (e.g., glass fibers) having a more uniform or restricted fiber diameter and / or length distribution is disclosed. Spin fibers having improved characteristic distribution(s) across the volume of the fibers facilitate the formation of improved nonwoven fibrous mats and products formed from the mats.

Provided is a carbon material containing carbon fibers having a structure in which cylindrical carbon hexagonal net surfaces are laminated in the fiber thickness direction, and having an average fiber diameter of 140 nm or more and an average fiber length of less than 5.0 μｍ.

The application discloses a SiON micro-nano fiber membrane with electromagnetic wave transmission and high-temperature heat insulation, and a preparation method and application thereof, and relates to the technical field of ceramic fibers.The fiber membrane is formed by overlapping SiON micro-nano fibers; the arrangement mode of the SiON micro-nano fibers in the fiber membrane is disordered or directional; the diameter of the SiON micro-nano fibers is 100 nm to 1.3 mu m; the content of Si element in the SiON micro-nano fibers is greater than 35 at.%, the content of O element is greater than 30 at.%, the content of N element is greater than 12 at.%, and the content of C element is less than 7 at.%. The SiON fiber membrane prepared by the application has the component / structure characteristics of micro-nano fiber diameter (100-1200 nm), low carbon and amorphous, and exhibits the characteristics of light weight, porosity, wave transmission, heat insulation, high-temperature stability and the like, and is a novel wave transmission and heat insulation integrated fiber material with wide application prospect.

The present invention is a nonwoven fabric (1) for use as a toner seal material for preventing toner leakage from the outer circumferential surface at an edge portion of a rotating body carrying powdered toner in an image forming device. The surface of the nonwoven fabric (1) has recessed portions (2) and raised portions (3) extending along the length direction (4) of the nonwoven fabric. The recessed portions (2) are groove-shaped recessed portions. The constituent fibers (6) have an average fiber diameter of 14.0 μm or less. The orientation of the constituent fibers (6) of the nonwoven fabric (1) is orthogonal or inclined with respect to the length direction (4) of the nonwoven fabric (1). The constituent fibers (6) are not heat-fused to each other. The angle of the orientation of the constituent fibers (6) with respect to the length direction (4) of the nonwoven fabric (1) is preferably 45°-135°.

The present invention discloses an on-line detection method for the porosity of the electrodes of a dissolution-deposition type flow battery. The specific steps include: measuring the fiber diameter of the porous electrode, then assembling the flow battery and injecting the discharged-state electrolyte; recording the pressure of the electrode to be measured under the rated flow rate; calculating the electrode permeability according to the measured pressure, flow rate, as well as the geometric dimensions of the electrode and the viscosity of the electrolyte; calculating the electrode porosity according to the electrode permeability and in combination with the fiber diameter of the electrode; successively charging the battery to different state of charge and measuring the electrode permeability at each state; fitting a pressure-permeability equation according to the measured electrode permeability and pressure data; inputting the fitting equation into the battery management system to directly read the electrode permeability under the operating state, or reading the pressure and then calculating the real-time electrode permeability by using the fitting equation. This method has a convenient process, does not require complex equipment, has a low cost, and realizes the on-line measurement of the porosity of the electrodes of the dissolution-deposition type flow battery.

The application relates to the technical field of refractory metal material processing, in particular to a vacuum smelting system and method for high-purity molybdenum and a fiber-structure molybdenum material, the vacuum smelting system for high-purity molybdenum comprises a three-layer composite crucible, the vacuum smelting method for high-purity molybdenum comprises the following steps: step S1): under the condition of a vacuum degree of less than or equal to 5*10 ‑3 Pa, a three-layer composite crucible is used to perform consumable smelting on molybdenum raw materials; step S2): a directional solidification rate is controlled to be 8-12 mm / min, and a longitudinal temperature gradient is formed to be greater than or equal to 100 DEG C / cm; step S3): multi-stage plastic deformation is implemented on a solidified ingot, and a total deformation amount is greater than or equal to 90%; the fiber-structure molybdenum material is formed with a longitudinal continuous fiber structure in the material, a grain length-diameter ratio is greater than or equal to 10:1, a fiber diameter is less than or equal to 5 microns, hydrogen content is less than or equal to 5 ppm, oxygen content is less than or equal to 50 ppm, and a room-temperature tensile strength is greater than or equal to 780 MPa; the application can prepare high-purity fiber-structure molybdenum material, and improves the problem of insufficient axial performance caused by the isotropy of a traditional equiaxed crystal structure.

The application discloses a preparation method of MTO catalyst. The method comprises the following steps: a) treating a phosphosilicate aluminosilicate molecular sieve in a titanium acid ester-containing alcohol solution, and drying to obtain a modified molecular sieve; b) mixing the modified molecular sieve obtained in the step a), a liquid medium, a matrix material, a structure reinforcing material and a binder to form a suspension; the structure reinforcing material is ceramic fiber with a diameter of 2-6 microns and a length-diameter ratio of 1-15; c) high-speed shearing the suspension obtained in the step b), and spray drying to obtain a microsphere catalyst; and d) calcining the microsphere catalyst obtained in the step c) to obtain a finished catalyst. The catalyst solves the problems of poor catalytic performance and high abrasion index of the fluidized bed catalyst in the prior art.

A method of forming spun fibers (e.g., glass fibers) having a more uniform or constrained fiber diameter and / or length distribution is disclosed. Spun fibers having improved property distributions across the fiber volume facilitate the formation of improved nonwoven fiber mats and products (e.g., coated glass facings) formed from the mats. The coated glass facings are suitable for use as facing materials, such as for gypsum or polyisocyanurate boards. Because the nonwoven mats are formed from a blend of smaller and larger fibers, and because the coating applied to the mats includes filler components having smaller and larger particle sizes, the faced wallboard can have improved air permeability properties, which allows for better prevention of leaks, blotching, and other visual defects.