750 results about "Fiber diameter" patented technology

A fibrous insulation product comprising a plurality of randomly oriented glass fibers and a cross-linked formaldehyde-free binder composition at least partially coating the fibers is disclosed. The cross-linked formaldehyde-free binder composition is formed from an aqueous binder composition comprising 5.0% by weight to 37.0% by weight of at least one monomeric polyol having at least four hydroxyl groups and at least 50.0% by weight of a cross-linking agent comprising a polymeric polycarboxylic acid having at least two carboxylic acid groups, based on the total solids content of the aqueous binder composition. The glass fibers have an average fiber diameter in the range of 8 HT to 12 HT. The fibrous insulation product, after curing, has a density, when uncompressed, in the range of 0.30 pcf to 2.7 pcf.

The purpose of the present invention is to provide: a high-sensitivity composite fiber which satisfies both stretching performance and wear resistance, exhibits softness, deep color rendering, and bulkiness that are superior to those of a wool material, and a blended fiber composite fiber, a woven knitted fabric, and a garment comprising the same; this composite fiber contains a polyester-based thermoplastic resin A and a polyester-based thermoplastic resin B, and satisfies the following requirements. (1) The difference (MA-MB) between the weight-average molecular weight MA of the polyester-based thermoplastic resin A and the weight-average molecular weight MB of the polyester-based thermoplastic resin B is 2000-15000. (2) The apparent thickness ratio (Dthick / Dthin) of the composite fiber is from 1.00 to 1.04. And (3) the crimp elongation of the composite fiber is 3.0-25.0%. And (4) in the cross section of the composite fiber, the polyester thermoplastic resin B covers the polyester thermoplastic resin A, and the ratio (tmin / D) of the minimum value tmin of the thickness t of the polyester thermoplastic resin B to the fiber diameter D of the composite fiber is 0.01-0.10. And (5) in the cross section of the composite fiber, the length Ct of the portion where the region having the thickness t satisfying 1.00 tmin < = t < = 1.05 tmin overlaps the circumference of the composite fiber is Ct > = 0.33 C with respect to the circumferential length C of the entire composite fiber.

A long-fiber non-woven fabric comprising fibers mainly composed of a thermoplastic resin, the fibers having an average single-fiber diameter of 10.0 [mu] m or more and 20.0 [mu] m or less, and the cross-sectional porosity of the long-fiber non-woven fabric being 30% or more and 80% or less. Provided is a long-fiber non-woven fabric having excellent flexibility in which it is possible to follow the device form of an airbag housing member, and excellent mechanical strength in which it is not broken or split when in contact with the airbag housing member.

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 provides a preparation method of a full-hydrophilic composite material with a pore diameter gradient and a one-way moisture conduction function. A double-layer hydrophilic composite layer with a pore difference structure is prepared by adopting a means of combining an electrostatic spinning process and a spunlace non-woven process, so that the one-way moisture conduction function is realized. The preparation method comprises the following steps: firstly preparing a hemp / viscose spunlace non-woven layer, then preparing a polylactic acid / chitosan nanofiber membrane through an electrostatic spinning process, and finally compounding the hemp / viscose spunlace non-woven layer and the polylactic acid / chitosan nanofiber membrane to prepare the composite material with the one-way moisture conduction function. The two hydrophilic layers with fiber diameter difference and pore size difference are compounded through a double-layer assembly strategy, the composite material with a brand-new structure and a one-way moisture guiding function is constructed, the composite material has a good one-way liquid conveying function, the continuous one-way moisture guiding function is achieved, and the composite material is suitable for large-scale popularization and application. Wide application prospects are realized in the fields of textile clothing, medical and health materials and the like.

The invention discloses a method for preparing a fully degradable hydrophilic / hydrophobic double-layer nanofiber membrane based on an electrostatic spinning method. The preparation method comprises the following steps: selecting a degradable high polymer material, taking hexafluoroisopropanol as a solvent, preparing a hydrophilic layer spinning solution from polylactic acid-glycolic acid copolymer (PLGA), methoxypolyethylene glycol (mPEG) and carbon dots (CDs) with antibacterial and anti-inflammatory characteristics, preparing a hydrophobic layer spinning solution from polycaprolactone (PCL), preparing a hydrophilic layer spinning solution from the hydrophilic layer spinning solution, preparing a hydrophilic layer spinning solution from the hydrophobic layer spinning solution, and preparing a hydrophilic layer spinning solution from the hydrophilic layer spinning solution and the hydrophobic layer spinning solution; and preparing the hydrophilic / hydrophobic double-layer nanofiber membrane by adopting an electrostatic spinning machine. The preparation method is simple, and the prepared double-layer nanofiber membrane is uniform in fiber diameter distribution and good in hydrophilic / hydrophobic layer effect and has a good application prospect in the field of biology.

The invention discloses a high-air-permeability humidity display film based on optical interference and a preparation process of the high-air-permeability humidity display film. Comprising a substrate layer, a humidity response layer, a middle layer and a hydrophobic layer, wherein the substrate layer is made of a transparent material; a plurality of breathable micropores are formed in the substrate layer; the humidity response layer is a thin film layer which is made of a humidity sensitive material and has the thickness of 50-100 [mu] m, micropores are formed in the humidity response layer, and the pore diameter of the micropores is 0.5-2 [mu] m; the middle layer is a nanofiber membrane, and the fiber diameter of nanofiber is controlled to be 100-300 nm; the density of the middle layers in the length direction is in gradient change so as to control the air permeability of the humidity response layers corresponding to the middle layers with different densities; the hydrophobic layer is made of a transparent and breathable material and provides a good protection effect for the humidity display film. According to the invention, the hydrophilic microporous structure material is adopted, the humidity can be rapidly conducted to the humidity response layer through the multilayer design, instant color change is generated, and the humidity indication effect is more sensitive.

The invention relates to the technical field of medical instruments, in particular to a multi-layer ultra-light hernia patch which comprises a large-mesh electrostatic spinning tissue ingrowth layer, a mesh woven base material layer and an anti-adhesion layer which are sequentially connected in a stacked mode. Wherein after the large-mesh electrostatic spinning tissue ingrowth layer is implanted into a human body, a cell microenvironment can be better simulated, cell adhesion, differentiation and migration are facilitated, uniform distribution of newborn cells in the fiber direction of an electrospinning membrane is promoted, granulation tissues uniformly ingrow in a defect part, and the electrospinning fiber membrane and the tissues are cooperatively repaired; secondly, the middle layer can provide supporting performance and mechanical performance of the patch in the early stage for the patch, the defects of the electrospinning fiber membrane in the supporting performance and the mechanical performance are overcome, the long-term implantation amount of the patch after later degradation is greatly reduced, and the foreign body sensation is obviously reduced; the anti-adhesion layer also adopts the electrostatic spinning technology, and the anti-adhesion effect is achieved by selecting materials and regulating and controlling the porosity, the aperture and the fiber diameter of the electrospun fiber membrane.

A filter media comprises a first fiber layer and a second fiber layer positioned downstream of the first fiber layer. The first fiber layer has a first geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is greater than 2. The second fiber layer has a second geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is less than 2.

The invention provides a fiber diameter batch processing method. The method comprises the steps of image preprocessing and scale region determination, filtering and region screening, morphological processing and region selection, final processing and radius calculation, and fiber diameter calculation. According to the invention, the scale region is accurately determined in image preprocessing, and the accuracy is improved by multi-feature screening of scales; in the filtering link, median and mean filtering is combined, areas are accurately divided based on filtering differences, noise is effectively suppressed, and meanwhile key information is reserved; during morphological processing, through mutual cooperation of multiple corrosion, expansion and screening operations, a fiber area is gradually and accurately removed, and fibers are accurately stripped from a complex image background; in radius calculation, circle fitting and iterative optimization are carried out through a least square method, and it is ensured that the radius of an inscribed circle is accurate; and finally, according to diameter calculation, pixels and physical sizes are unified through a rigorous formula, batch high-precision processing is achieved, solid data support is provided for fiber characteristic research, quality control and the like, the processing efficiency and precision are greatly improved, and the industry competitiveness is enhanced.

The present invention provides a reinforcing fiber substrate having a resin material layer containing thermoplastic resin fibers, wherein the occurrence of microcracks caused by the resin material layer is reduced; and the present invention relates to a reinforcing fiber substrate 30 comprising one or more reinforcing fiber layers 330, 340, 350 comprising reinforcing fibers, one or more resin material layers 310 to 316 comprising thermoplastic resin fibers, and auxiliary yarns, wherein the auxiliary yarns maintain the integrity of the reinforcing fiber layer and / or the reinforcing fiber substrate by connecting the reinforcing fibers and / or the reinforcing fiber layers to each other, and wherein the mean fiber diameter of the thermoplastic resin fibers is 0.5 µm to 35 µm.

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 purpose of the present invention is to provide a composite electrolyte membrane which has excellent chemical resistance and can maintain sufficient mechanical strength even under conditions of high humidity and high pressure, which are the operating conditions for electrochemical hydrogen pumps and water electrolyzers. This composite electrolyte membrane, which is for achieving said purpose, has a composite layer obtained by combining a polyelectrolyte with a mesh woven material that satisfies (1) and (2) and comprises liquid crystal polyester fibers or polyphenylene sulfide fibers. (1): Mesh thickness (μm) / fiber diameter (μm)<2.0. (2): Opening (μm) / fiber diameter (μm)>1.0.

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.

The invention relates to the technical field of filter materials, and discloses a preparation method of a deformation-resistant high-dust-holding-capacity filter bag material.According to the method, a framework layer, a non-woven fabric filter layer, an electrostatic layer and a non-woven fabric filter layer are compounded into the deformation-resistant high-dust-holding-capacity filter bag material through melt spinning composite treatment. The skeleton layer is prepared from modified polypropylene prepared from modified graphene hollow spheres and polypropylene, the gram weight of the prepared skeleton layer is 30-60 g / m < 2 >, the thickness is 0.4-0.6 mm, the fiber yarn diameter is 40-60 microns, and after the skeleton layer is compounded with the electrostatic layer and the non-woven fabric filter layer, the stiffness of the filter material can be remarkably improved; the stiffness test of the deformation-resistant high-dust-holding-capacity filter bag material can reach 72-83%, and the deformation resistance is remarkably enhanced.

The invention discloses a collagen-based and high-transparency matrix for cornea thickening and a preparation method of the collagen-based and high-transparency matrix. The preparation method comprises the following steps: assembling a collagen composite solution into a collagen matrix implant on a set curvature mold through electrochemical deposition; the collagen composite solution is prepared from collagen, glacial acetic acid, hydrogen peroxide, heparin and water; putting the obtained collagen matrix implant and a mold into a cross-linking agent solution for cross-linking; cleaning the residual cross-linking agent after completion, separating the collagen matrix implant from the mold, and placing the collagen matrix implant under an ultraviolet light source for cross-linking to obtain a double-cross-linked collagen matrix implant; and soaking the double-crosslinked collagen matrix implant in a nerve growth factor solution, and performing absorption and combination to obtain the collagen-based and high-transparency matrix for cornea thickening. According to the invention, an electro-deposition assembly technical scheme is adopted, the diameter and thickness of collagen assembly fibers are adjusted and controlled through electric field energy, and the collagen assembly fibers are orderly and regularly arranged, so that scattering and refraction of light are reduced, the light transmittance of cornea is increased and can reach more than 90%, and the problem of light blocking caused by materials is effectively avoided. Operation is matched with femtosecond equipment, operation is easy, consumed time is short, and trauma is small.

The invention relates to the technical field of filtering materials, and discloses a preparation method of a low-leakage-point filtering framework convenient for membrane compositing and a filter element of a filter.According to the method, polypropylene is used as a raw material to prepare the filtering framework through a spunbond method, the filtering framework comprises a supporting layer and a composite layer, and the fiber diameter of the supporting layer is larger than that of the composite layer; the supporting layer is used as a supporting framework to improve the stiffness and strength of the filtering layer, the composite layer is used for being compounded with the polymeric membrane, the fiber diameter of the composite layer is smaller than that of the supporting layer, and the flatness uniformity of the filtering layer compounded with the polymeric membrane is improved; the combination firmness of the filter layer and the filter framework is improved through the gradually-changed filter framework structure, and the leakage points of the filter layer are reduced.

The invention belongs to the field of nanofiber composite fabric preparation, and provides a nanofiber high-moisture-permeability waterproof fabric with multi-stage communicated pore canals and a preparation method thereof.The fabric body comprises an outer layer, a middle layer and an inner layer, the outer layer is a pure polyester waterproof fabric subjected to waterproof finishing, the middle layer is a nanofiber membrane with the multi-stage communicated pore canals, and the inner layer is a nano-fiber membrane with the multi-stage communicated pore canals; the inner layer is a pure polyester fabric; the inner side of the outer-layer pure polyester waterproof fabric is attached to the hydrophobic polyvinyl alcohol nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding, and the inner-layer pure polyester fabric is attached to the hydrophilic polyurethane nanofiber membrane of the nanofiber membrane with the multi-stage communicated pore channels in the middle layer through hot melt adhesive compounding. The middle layer of the nanofiber membrane is formed by sequentially overlapping multiple stages of nanofiber membrane layers, each stage of nanofiber membrane layer is provided with 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; nanofibers of two membranes among the multistage nanofiber membrane layers and in the membrane layers are in cross lap joint to form a three-dimensional structure with multistage communicated pore channels, and the pore diameter is gradually reduced from the hydrophilic polyurethane nanofiber membrane to the hydrophobic polyvinyl alcohol nanofiber membrane. The moisture permeability is higher than 15000g / (m < 2 >. 24h), and the hydrostatic pressure is higher than 60kPa.

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.

Provided is a fibrillated chemically modified cellulose fiber, which has a type-I cellulose crystallinity of at least 50%, an anionic charge density of 0.10-2.00 meq / g, and an average fiber diameter of greater than 500 nm. Also, provided is a fibrillated chemically modified cellulose fiber, wherein the value (A / B) obtained by dividing the viscosity A measured at a shear rate of 0.01 / sec by the viscosity B measured at a shear rate of 1000 / sec in an aqueous dispersion having a solid content of 1 mass % is at least 100. These fibers have high water retention and high thixotropy.

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.

Provided is a cage for a deep groove ball bearing, the cage being hard to be broken even under a high-speed rotating environment of an electric vehicle speed reducer and a motor that are used in an environment where a dmn value is 850,000 or more, as in an electric vehicle. The deep groove ball bearing includes the resin cage containing, as a reinforcement material, glass fibers, carbon fibers, or both. The reinforcement material has a number-average fiber length of 100 to 600 μm and a number-average fiber diameter of φ4 to φ18 μm.

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 tissue regeneration promoting sheet (10) is provided with a cell holding sheet (12) which is a non-woven fabric that contains fibers mainly composed of polycaprolactone and is capable of allowing a cell suspension containing stem cells to permeate therethrough. The fiber diameter of the fibers constituting the non-woven fabric may be in the range of 300 nm to 2 [mu] m. The weight per unit area of the non-woven fabric may be in the range of 1 g / m2 to 3 g / m2. The thickness of the non-woven fabric may be 300 [mu] m or more. The tissue regeneration promoting sheet (10) may also be provided with a reinforcing sheet (14) which is laminated on the nonwoven fabric and into which the cell suspension can permeate.