105results about How to "Improve charging performance" patented technology

A toner containing a colorant, a binder resin and a laminar inorganic mineral in which part or all of the ions present between layers are modified by organic ions. The toner can be prepared by a method including dispersing or emulsifying a toner constituent mixture liquid containing the colorant, the binder resin and / or a precursor thereof, and the laminar inorganic mineral, in an aqueous medium. The density of the laminar inorganic mineral measured by XPS for the toner surface before (A) and after(B) mixing and kneading satisfies the following relationship: A>B.

A charging member is provided which can uniformly charge a photosensitive member without requiring any pre-exposure means in a low-, medium- or high-speed electrophotographic apparatus, and has a sufficient charging performance. An electrophotographic apparatus and a process cartridge are also provided which can keep multi-color ghost images from occurring and can form high-grade electrophotographic images stably. The charging member has a substrate, an elastic layer and a surface layer, which surface layer contains a high-molecular compound having an Si—O—Nb linkage; the high-molecular compound having a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (2).

The invention discloses a lithium ion battery capable of being subjected to high-rate charge and discharge and a preparation method thereof. The lithium ion battery capable of being subjected to high-rate charge and discharge comprises a positive pole, a negative pole and a diaphragm, wherein the positive pole comprises the following components in percentage by weight: 80-98% of positive active material, 1-19% of conductive agent and 1-19% of binder; the negative pole comprises the following components in percentage by weight: 80-98% of negative active material, 1-19% of conductive agent and 1-19% of binder; the positive active material includes one or two of Li(NiCoMn)O2 and lithium manganate; the negative active material includes one or two of hard carbon and soft carbon; the conductive agent is one of superconducting carbon black, carbon fiber, crystalline flake graphite and a carbon nanotube; and the binder is one of kynar, butadiene styrene rubber, sodium carboxymethylcellulose and hydroxypropyl / carboxymethyl cellulose. According to the lithium ion battery capable of being subjected to high-rate charge and discharge and the preparation method thereof disclosed by the invention, the lithium ion battery has high-rate charge and discharge characteristics, and is good in charge and discharge characteristics, wide in temperature application range, excellent in low-temperature charge performance, long in cycle life and high in safety.

Disclosed are a porous spherical carbon-coated sodium vanadium phosphate composite positive electrode material and a preparation method thereof. The composite positive electrode material is prepared by the steps of (1) dissolving a vanadium source compound and a reducing agent into water, performing heating and then adding a phosphorus source compound and a sodium source compound to obtain a mixedsolution; (2) adding an organic solvent, wherein the polarity of the organic solvent is greater than that of water, and putting into a sealed container to be subjected to a heating reaction, and next, performing cooling, centrifuging, washing, depositing and drying to obtain precursor powder; and (3) performing mixing with glucose, and performing sintering and cooling on the mixture in protectiveatmosphere. The positive electrode material is spherical and has the primary granular diameter of 50-200nm; when the composite positive electrode material is assembled into a battery, the initial discharge capacity per gram at 0.2C and 10C within a voltage range of 2.0-3.8V can reach 110 mAh.g<-1> and 95 mAh.g<-1> respectively; the capacity retention rate can reach 99.47% at 10C rate after 100 cycles; and the method is simple and low in reaction temperature.

The invention discloses a preparation method of a solvent-resistant compound nanofiltration membrane and relates to a preparation method of the membrane. The invention aims at solving the problem of superlow solvent permeation flux caused by good compatibility between an alcohol solvent and the nanofiltration membrane prepared by an existing method. The preparation method comprises the following steps of: (1) preparing an ultrafiltration base membrane; (2) preparing pyrrole-alcohol / graphene oxide solution; (3) preparing a strong-oxidant solution; (4) preparing an ultrafiltration base membrane containing pyrrole; (5) preparing a crude solvent-resistant compound nanofiltration membrane; (6) carrying out optimized treatment, thus obtaining the solvent-resistant compound nanofiltration membrane. The preparation method disclosed by the invention has the advantages that the prepared solvent-resistant compound nanofiltration membrane is a polypyrrole / graphene oxide compound nanofiltration membrane adopting polypyrrole / graphene oxide as a selecting layer; the compound nanofiltration membrane has excellent stability in alcohol substances, maintains high permeation flux and rejection rate, and is applicable to a separating system applying alcohol as medium. The preparation method is mainly used for preparing the solvent-resistant compound nanofiltration membrane.

A magnetic carrier exhibiting excellent durability against mechanical impact as exerted by vibration and capable of exhibiting a stable charging performance in electrophotography is provided. The magnetic carrier is formed through a process including steps of: surface treating inorganic compound particles with a lipophilizing agent having a functional group (A) selected from epoxy group, amino group, mercapto group, organic acid group, ester group, ketone group, halogenated alkyl group and aldehyde group; forming composite particles from the surface-treated inorganic compound particles and a binder resin; and then surface-coating the composite particles with a coupling agent having a functional group (B) different from the functional group (A) of the lipophilizing agent and selected from epoxy group, amino group and mercapto group, or with a coating resin having a functional group (C) different from the functional group (A) of the lipophilizing agent and selected from epoxy group, amino group, organic acid group, ester group, ketone group and halogenated alkyl group.

Provided is magnetic toner including capsule type toner particles each having a surface layer (B) on a surface of a toner base particle (A) containing at least a binder resin (a) mainly formed of a polyester, a magnetic substance, and a wax, in which, the surface layer (B) includes a resin (b), and the resin (b) includes a resin selected from the group consisting of a polyester resin (b1), a vinyl resin (b2), and a urethane resin (b3); a glass transition temperature Tg(a) of the binder resin (a) and a glass transition temperature Tg(b) of the resin (b) satisfy a relationship of Tg(a)<Tg(b); a magnetization (&sgr;t) in an external magnetic field of 79.6 kA / m of the magnetic toner is 12 Am2 / kg or more and 30 Am2 / kg or less; and an average circularity of the toner is 0.960 or more and 1.000 or less.

A non-magnetic single-component toner 8 of the present invention has toner mother particles 8a, and external additives 12 comprising: two hydrophobic silicas 13, 14 of which particle diameters are different from each other, i.e. a mean primary particle diameter of 7 nm to 12 nm and a mean primary particle diameter of 40 nm to 50 nm, and a hydrophobic rutile / anatase type titanium oxide 15 having a spindle shape of which major axial diameter is in a range from 0.02 nm to 0.10 nm and the ratio of the major axial diameter to the minor axial diameter is set to be 2 to 8, wherein the external additives 12 adhere to the toner mother particles 8a. By the hydrophobic silicas 13, 14 having work function smaller than the work function of the toner mother particles 8a, the negative charging property is imparted to the toner mother particles 8a and the fluidity is also insured. On the other hand, by mixing and using hydrophobic rutile / anatase type titanium oxide particles 15 having work function larger than or equal to the work function of the toner mother particles 8a together with the hydrophobic silicas 13, 14, the non-magnetic single-component toner 8 is prevented from excessively charged. Therefore, the amount of fog toner on non-image portions is reduced, the transfer efficiency is further improved, the charging property is further stabilized, and the production of reverse transfer toner is further inhibited.

A charging member, one embodiment of which includes a conductive support; a conductive elastomer layer stacked on the conductive support; and a conductive resin layer stacked on the conductive elastomer layer, wherein the conductive resin layer includes: a matrix material; and a plurality of particles dispersed in the matrix material, wherein the particles include first particles, and when a thickness of a portion formed of the matrix material alone of the conductive resin layer is referred to as A [μm], an average particle size of the first particles is referred to as B1 [μm], and an interparticle distance of the particles is referred to as Sm [μm], then A is in a range of 1.0 μm to 7.0 μm, B1 / A is in a range of 5.0 to 30.0, and Sm is in a range of 50 μm to 400 μm.

The invention discloses a method for preparing a natural polyelectrolyte nanofiltration membrane and belongs to the technical field of preparation of membrane materials. According to the method disclosed by the invention, a quaternary ammonium cation cellulose ether and a quaternized chitosan blend form an ultra-thin separation layer material, polyvinyl alcohol serves as a casting solution additive, and polysulfone serves as a supporting layer material; two kinds of natural polyelectrolyte serve as a membrane material, and a cross-linking agent is added, so that the two polymers are cross-linked to form a spatial semi-interpenetrating network structure, the polymer networks are mutually tangled, and therefore, the membrane structure stability is enhanced. Meanwhile, the natural polyelectrolyte charged nanofiltration membrane has an antibacterial group capable of inhibiting and killing bacterium components in water, while the membrane structure is provided with many hydrophilic groups,and the hydrophilic property on the membrane surface is excellent. Meanwhile, the raw materials are readily available, the cellulose belongs to renewable resources, the chitosan belongs to natural polysaccharides, any risk of environmental pollution is avoided, and the preparation method is convenient and practical.

A magenta toner characterized by satisfying, in DSC measurement, 40.0≦Tg(0.5)≦60.0 and 2.0≦Tg(4.0)-Tg(0.5)≦10.0, wherein when preparing a solution of which the magenta toner is dissolved in ethyl acetate, and defined the concentration of the thereof as Cm1 (mg / ml), and the light absorbance thereof at a wavelength of 538 nm as A(ethyl acetate)538, the ratio of A(ethyl acetate)538 to Cm1 satisfies the formula, A(ethyl acetate)538 / Cm1<0.15, and, when preparing a solution of which the magenta toner is dissolved in chloroform, and defined the concentration of the thereof as Cm2 (mg / ml), and the light absorbance thereof at a wavelength of 538 nm as A(chloroform)538, the ratio of A(chloroform)538 to Cm2 satisfies the formula, 2.00<A(chloroform)538 / Cm2<6.55.

Provided is magnetic toner including capsule type toner particles each having a surface layer (B) on a surface of a toner base particle (A) containing at least a binder resin (a) mainly formed of a polyester, a magnetic substance, and a wax, in which, the surface layer (B) includes a resin (b), and the resin (b) includes a resin selected from the group consisting of a polyester resin (b1), a vinyl resin (b2), and a urethane resin (b3); a glass transition temperature Tg(a) of the binder resin (a) and a glass transition temperature Tg(b) of the resin (b) satisfy a relationship of Tg(a)<Tg(b); a magnetization (σt) in an external magnetic field of 79.6 kA / m of the magnetic toner is 12 Am2 / kg or more and 30 Am2 / kg or less; and an average circularity of the toner is 0.960 or more and 1.000 or less.

To provide a magnetic toner which: enables a stable image density to be obtained irrespective of a use environment; and exhibits excellent low-temperature fixability, little image deterioration upon fixation, high coloring power, and a reduced toner consumption. The present invention relates to a magnetic toner containing at least: a binder resin; and a magnetic body. The binder resin contains a polyester unit. The toner has a weight average particle size of 5.0 to 9.0 μm, a true specific gravity of 1.3 to 1.7 g / cm3, and a saturated magnetization of 20 to 35 Am2 / kg in a magnetic field of 796 kA / m. The dielectric loss tangent (tan δ) of the toner satisfies (tan δH−tan δL) / tan δL≦0.20 at 100 kHz.

The invention relates to a high-efficiency static electricity dust removal device based on the electrification-by-friction principle of differential hairbrushes. The high-efficiency static electricitydust removal device based on the electrification-by-friction principle of the differential hairbrushes mainly comprises a box, a grid plate, a motor, a center shaft, a draught fan shell, a draught fan, an electromagnetic clutch, a push-pull type dust collection tank, an annular metal net, a flat key, a fibrous membrane, the hairbrushes and a filtration component, wherein the fibrous membrane withthe bulged soft hairbrushes is arranged on the annular metal net; the hairbrushes are in contact with the surface of the first layer of electrospinning fibrous membrane of the filtration component tocause mutual friction, thereby enabling the contact surface to generate charge transfer and generating static electricity; the electromagnetic clutch is arranged between the draught fan and the annular metal net, so that the intermittent friction is generated between the hairbrushes and the filtration component, and the charge neutralization time of the fibrous membrane with the bulged soft hairbrushes and the filtration component is delayed; the membrane loss is reduced; and the electrified durability is improved. The high-efficiency static electricity dust removal device based on the electrification-by-friction principle of the differential hairbrushes has the beneficial effects that the filtration component has a good charge performance and a filtration performance on the whole; the fibers can be degraded and are green and environmentally-friendly; the static electricity dust removal is carried out by autoexcitation friction; the energy consumption and equipment cost can be obviously reduced; and the device is simple and convenient, has extra small volume and can save indoor space.

The invention discloses a charging control method, device and system. The charging control method comprises the following steps that charging current or charging temperature of a terminal charging port is acquired every scheduled time, and the required voltage of charging equipment is acquired according to the charging current or the charging temperature; and charging voltage of the terminal charging port is acquired, and the required voltage is transmitted to the charging equipment when the charging voltage is not equal to the required voltage so that the charging equipment performs voltage regulation. The charging voltage of the charging equipment can be flexibly regulated by the terminal according to the charging state of the terminal so that charging efficiency is enhanced and a better charging performance of the terminal can be maintained.

A yellow toner is provided which can form high-quality images and has high offset resistance and excellent charging performance while being a capsule-type toner having excellent low-temperature fixability. The yellow toner satisfies, in DSC measurement, 40.0≦Tg(0.5)≦60.0 and 2.0≦Tg(4.0)−Tg(0.5)≦10.0, wherein when the concentration of the yellow toner in an ethyl acetate dispersion is Cy1 (mg / ml) and the light absorbance at a wavelength of 422 nm of the dispersion is A(ethyl acetate)422, the relationship between Cy1 and A(ethyl acetate)422 satisfies A(ethyl acetate)422 / Cy1<0.45, and when the concentration of the yellow toner in a chloroform solution is Cy2 (mg / ml) and the light absorbance at a wavelength of 422 nm of the solution is A(chloroform)422, the relationship between Cy2 and A(chloroform)422 satisfies 6.00<A(chloroform)422 / Cy2<14.4.

The invention discloses a method for preparing a carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane. The method comprises the steps: preparing a carboxymethylcellulose sodium composite by an ionic crosslinking method, adding the carboxymethylcellulose sodium composite into an aqueous phase monomer solution for synthesis of a polyamide membrane, and preparing the carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane by an interfacial polymerization method. With utilization of good hydrophilicity, charge performance and a unique nano pore structure of the composite, the water permeation flux of the membrane is greatly improved while the high selectivity of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 0.6 MPa, the nanofiltration membrane has the water flux of 50-65 L.m<-2>.h<-1>, has quite high interception rate on divalent ions and the highest reaching 97%, and has the interception rate on monovalent ions of generally less than 25%. Therefore, the prepared carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane has high separation selectivity and water permeation flux, and has the advantages of simple and feasible membrane preparation method, low cost, and good industrialized application prospects.

The invention provides a wireless charging system and a wireless charging device thereof. The wireless charging system comprises equipment to be charged and the wireless charging device, the equipment to be charged comprises a target battery and a first communication unit, the target battery supports wireless charging, the wireless charging device comprises a charging unit, a starting control unit and a second communication unit, and the charging unit comprises a power supply, a charging circuit, a discharging circuit and a charging control unit; after the wireless charging device recognizes charging requirements of the equipment to be charged, a target battery charging process comprises a first charging stage, a discharging stage and a second charging stage which are sequential, continuous and circulatory; in the first charging state, the target battery is charged with constant voltage; in the discharging stage, the target battery is discharged with continuously reduced discharging voltage until the voltage is zero; and in the second charging state, the target battery is charged with continuously increased charging voltage until the voltage is constant voltage. The wireless charging system and the wireless charging device thereof can simultaneously meet requirements of convenience of wireless charging, prolongation of endurance time and prolongation of the service life of the battery.

A developing device includes a developer carrying member; a first feeding path in which a developer is to be supplied and fed to the developer carrying member at a position in which the first feeding path opposes the developer carrying member; a second feeding path, communicating with the first feeding path, for forming a circulation path with the first feeding path; a discharge opening for permitting discharge of an excessive developer in the developing device; a first supply opening, located downstream of the first feeding path opposing the developer carrying member with respect to a developer feeding direction and located upstream of the discharge opening with respect to the developer feeding direction, for permitting supply of a first developer containing at least toner; and a second supply opening, located upstream of the first feeding path with respect to the developer feeding direction and located downstream of the discharge opening with respect to the developer feeding direction, for permitting supply of a second developer which has a toner ratio lower than that of the first developer or is consisting only of a carrier.

A resin coated carrier for electrophotography and a two-component developer for electrophotography made therefrom, in which electrostatic charge giving ability to toner is high, anti-spent property is superior, charging property is stable even if a large number sheets are continuously printed, initial electrostatic charge increasing ability and electrostatic charge maintaining ability after leaving are also superior, and fogging at supplying toner and fogging after leaving are not generated. In a resin coated carrier for electrophotography comprising a coating material and a core material, in which the coating material covers the surface of the core material, the coating material contains a resin component and a conductive agent, the core material is ferrite, and electric resistance of the carrier at an applied voltage of 100 V set to be 1.0×103 to 1.0×106 Ω.cm, or breakdown voltage is set to be 120 to 280 V.

Provided is a toner for electrostatic image development, which has excellent fluidity and inhibits reduction in the amount of toner charge and generation of fogging in high-temperature, high-humidity environments. The toner for electrostatic image development comprises: colored resin particles containing an adhesive resin and a coloring agent; and an external additive. Core-shell composite microparticles constitute the external additive, in which the surface of resin microparticles is coated by at least one inorganic component selected from the group consisting of silica, alumina, titania, and zirconia. When the total volume of the core-shell composite microparticles is 100 vol%, the volume percentage of the inorganic component(s) in the core-shell composite microparticles is 45-75 vol%.

A developing device includes a developer carrying member; a first feeding path in which a developer is to be supplied and fed to the developer carrying member at a position in which the first feeding path opposes the developer carrying member; a second feeding path, communicating with the first feeding path, for forming a circulation path with the first feeding path; a discharge opening for permitting discharge of an excessive developer in the developing device; a first supply opening, located downstream of the first feeding path opposing the developer carrying member with respect to a developer feeding direction and located upstream of the discharge opening with respect to the developer feeding direction, for permitting supply of a first developer containing at least toner; and a second supply opening, located upstream of the first feeding path with respect to the developer feeding direction and located downstream of the discharge opening with respect to the developer feeding direction, for permitting supply of a second developer which has a toner ratio lower than that of the first developer or is consisting only of a carrier.

The invention relates to an amphoteric composite forward osmosis membrane. According to the amphoteric composite forward osmosis membrane, an adopted porous support membrane is a super-hydrophilic polyvinylidene fluoride membrane; a polyamide layer is formed on the porous support membrane, and a zwitterionic layer is formed on the polyamide layer. In the present invention, the zwitterionic layer is formed by amido groups through zwitterionic reaction; through cooperation with the super-hydrophilic characteristic of the polyvinylidene fluoride membrane prepared through water vapor induced phaseseparation, the strong hydration and the charging performance of a catechol derivative modified graphene oxide nano-water channel and the zwitterionic skin layer, the water flux of the composite forward osmosis membrane is greatly improved while a low back-mixing salt flux is kept.

An electrophotographic developer and a process for forming an image are provided in that the fixing can be conducted at a lower temperature than the conventional technique, and that are excellent in the powder storage stability, the anti-blocking property and the image storage stability after fixing without impairing the density, the coloring property and the transparency of the image after fixing, and further have appropriate electric charging property without any problem of fogging or cloud with excellent maintenance property of electric charge. The electrophotographic developer contains a toner for developing an electrostatic image containing a coloring agent and a binder resin containing, as a main component, a crystalline resin having a melting point of about from 60 to 120 DEG C., and a carrier having a resin film containing a nitrogen-containing resin on a surface thereof. The process for forming an image is carried out by using the electrophotographic developer.

The invention provides a preparation method of a solvent resistant composite nanofiltration membrane, relates to a preparation method of a membrane, and mainly aims at solving the problem that a nanofiltration membrane prepared through an existing method is good in alcohols solvent compatibility, so as to result in a super low solvent permeation flux. The preparation method comprises the steps of 1, preparing an ultrafiltration base membrane; 2, preparing an aniline-ethanol solution; 3, confecting a strong oxidant solution; 4, preparing an ultrafiltration base membrane containing aniline; 5, preparing a solvent resistant composite nanofiltration membrane crude product; 6, performing optimizing process to obtain the solvent resistant composite nanofiltration membrane. The preparation method has the advantages that the prepared solvent resistant composite nanofiltration membrane is a polyaniline / polyacrylonitrile composite nanofiltration membrane taking polyaniline as a selecting layer, the composite nanofiltration membrane has excellent stability in alcohols matters, keeps a relatively high permeation flux and retention rate, and is applicable to a separation system applying alcohols as a medium. The preparation method provided by the invention is mainly used for preparing the solvent resistant composite nanofiltration membrane.

The invention discloses a fluidized electric separation device which comprises a fluidized electric separation device body, a high-pressure power supply and an air supply system. An air chamber of the fluidized electric separation device body is connected with the air supply system through a pipe. The fluidized electric separation device body comprises a fluidized bed, an air distributor, the air chamber, a feeding inlet and a discharging outlet. The feeding inlet and the discharging outlet are formed in the two ends of the fluidized bed respectively. A material distribution plate is arranged in the discharging outlet in the horizontal direction. Electrode plates are arranged on the inner walls of the two sides of the fluidized bed. the inner sides of the two electrode plates or the inner side of one electrode plate are / is exposed or provided with an insulating partition, and the electrode plates are connected with the positive pole and the negative pole of the high-voltage power supply respectively; or one side of each electrode plate is connected with the power supply, and the other side of each electrode plate is connected with the ground. A friction bar set is arranged in the fluidized bed in the axial direction. Powder material is in full friction with friction bars in the fluidized bed and the electrode plates or the insulating partition to be fully charged, or the powder material is in conduction sensing with the friction bars in the fluidized bed and the electrode plates or the insulating partition to be fully charged. The electric charging requirement in the separation process is met, the material charging effect is good, separation efficiency is high, the process is simple, energy consumption is low, and the device is simple.

The invention provides a method for preparing a compound carbon polymer lead-acid battery. The preparation method comprises preparation of a compound carbon material, compounding with a conducting polymer and preparation of a battery. The prepared compound carbon material is physically mixed with the conducting polymer to obtain a compound carbon polymer composite material. The compound carbon conducting polymer composite material is added into a positive electrode of the lead-acid battery, so that the conductivity of the positive electrode can be effectively improved; the void ratios of positive electrode active substances are increased; and meanwhile, agglomeration of graphene can be blocked, and a carbon material can form a space conductive network structure. The conducting polymer can be taken as a conducting framework in the positive electrode active substances to restrain early argillization of the positive electrode, so that the cycle life is prolonged. The prepared compound carbon conducting polymer lead-acid battery has the characteristics of short forming time, long battery cycle life and high capacity.

A yellow toner is provided which can form high-quality images and has high offset resistance and excellent charging performance while being a capsule-type toner having excellent low-temperature fixability. The yellow toner satisfies, in DSC measurement, 40.0≦Tg(0.5)≦60.0 and 2.0≦Tg(4.0)−Tg(0.5)≦10.0, wherein when the concentration of the yellow toner in an ethyl acetate dispersion is Cy1 (mg / ml) and the light absorbance at a wavelength of 422 nm of the dispersion is A(ethyl acetate)422, the relationship between Cy1 and A(ethyl acetate)422 satisfies A(ethyl acetate)422 / Cy1<0.45, and when the concentration of the yellow toner in a chloroform solution is Cy2 (mg / ml) and the light absorbance at a wavelength of 422 nm of the solution is A(chloroform)422, the relationship between Cy2 and A(chloroform)422 satisfies 6.00<A(chloroform)422 / Cy2<14.4.