73results about How to "Improve the modification rate" patented technology

A technique capable of constructing a disaster recovery system reduced in performance degradation of a primary system is provided. The technique includes a step of conducting synchronous writing of log information into a secondary storage subsystem in a secondary system when a write request received from a host computer is a write request of log information, a step of temporarily storing a write request and conducting asynchronous writing into the secondary storage subsystem when the received write request is a write request of database data or status information, a step of modifying log information, data in a database area, and status information in the secondary storage subsystem according to contents of a write request received from a primary storage subsystem, and a step of recovering the database area according to contents of log information in a location indicated by the status information.

The present invention intends to provide an ethylene/alpha-olefin copolymer of specific structure, exhibiting excellent performance as a lubricant oil additive, capable of having various functional groups in high ratio, and serviceable as raw material for various solubilizing agents. The ethylene/alpha-olefin copolymer of the present invention is composed of ethylene and an alpha-olefin having 3 to 10 carbon atoms, and characterized by specific characteristics.

The invention discloses a bottom surface-integrated wear-resistant fluorosilicone-based super-amphiphobic coating, and a preparation method and application thereof. The preparation method comprises the following steps: 1) performing synergistic modification treatment on two or more nanoparticles to obtain modified blended particles; 2) adding the blended modified particles into a dispersing solvent, performing ultrasonic dispersion for 1 to 2 hours and then mechanically stirring; 3) adding a certain amount of tert-butyl acetate into fluoro-siloxane resin and performing shearing dispersion to obtain substrate material emulsion; 4) mixing the blended modified particle turbid liquid in the step 2 and the substrate material emulsion in the step 3, adding a coupling agent, heating, stirring anddispersing, and performing dispersion by a high-speed shearing dispersing machine to obtain super-amphiphobic coating; and 5) stirring the super-amphiphobic coating uniformly, spray-coating the surface of an object with the super-amphiphobic coating and drying at room temperature for 10 to 30 minutes to successfully prepare the wear-resistant integrated super-amphiphobic coating. The wear-resistant super-amphiphobic organic-inorganic hybrid coating is obtained by connecting a fluorine-silicon substrate and the blended modified particles through chemical grafting copolymerization reaction.

There is disclosed a process for producing bisphenol A by subjecting phenol and acetone to condensation reaction in the presence of a catalyst composed of an acid type ion exchange resin which is modified in part with a sulfur-containing amine compound, wherein the ion exchange resin having a modification rate of 10 to less than 20 mol % is used for a methanol concentration in acetone of lower than 250 ppm by weight, and the ion exchange resin having a modification rate of 20 to 65 mol % is used for a methanol concentration in acetone of 250 to 8000 ppm by weight. The above process is capable of producing bisphenol A at high conversion and selectivity by suppressing deterioration of catalytic activity due to methanol as an impurity in acetone.

The present invention discloses a cysteine functionalized hyaluronic acid conjugate prepared through freeze drying and thiol-ene click chemistry, and a synthesis method thereof, and discloses applications of the hyaluronic acid conjugate in preparation of an injectable in-situ hydrogel, and applications of the formed injectable in-situ hydrogel in islet cell culture and insulin secretion. According to the present invention, a series of cysteine functionalized hyaluronic acid conjugates having different modification rates and stable ether bonds are obtained through freeze drying and thiol-ene click chemistry, wherein the cysteine functionalized hyaluronic acid conjugate has the thiol active group, such that the further functionalized modification can be performed; and the hyaluronic acid conjugates having different modification rates and the polyethylene glycol conjugate can be subjected to the oxo ester-mediated natural chemical link reaction to obtain the an injectable in-situ formed hydrogel, wherein the obtained hydrogel has the good rheological property, the free thiol group can increase the cell adhesion of the hyaluronic acid and can be adopted as the cell scaffold material so as to be used in the islet cell culture and the insulin secretion stimulation, and the broad biomedical prospects are provided.

The invention relates to a HPLC (high-performance liquid chromatography) chromatographic column packing modification method. The method includes: putting HPLC chromatographic column packing in diazonium resin solution, stirring for reaction for 2-4h at the room temperature in a dark environment, carrying out centrifugal separation, washing and drying products, and performing exposure treatment under ultraviolet light for 10-20min. By adoption of photosensitive macromolecular diazonium resin as surface modifier, hydrogen-bonding interaction between the diazonium resin and surface silanol groups of silicon dioxide microspheres is converted into covalent bonding interaction by means of photo-crosslinking reaction, and accordingly hydrophobic groups can be introduced to the surface of the microsphere, and the modified chromatographic column packing has excellent separation effects.

The invention discloses a nanoreactor as well as a preparation method and application thereof. The nanoreactor comprises core-shell nanoparticles, manganese dioxide and a targeting ligand, wherein the surfaces of the core-shell nanoparticles are coated with the manganese dioxide and the targeting ligand layer by layer; the core-shell nanoparticles are formed by a metal organic framework, a photosensitizer, glucose oxidase and a polylactic acid-glycolic acid copolymer nano core wrapped by the metal organic framework, and the metal organic framework is formed by tannic acid and iron through coordination; and the targeting ligand is one or more of hyaluronic acid, synthetic polypeptide, a folic acid modified hydrophilic polymer and a nucleic acid aptamer. The nanoreactor can actively target to tumor cells, catalyzes oxygen production to realize in-situ oxygen supply of tumors, removes glutathione and ATP so as to inhibit and overcome tolerance, and enhances the photodynamic therapy efficiency. The preparation method is simple and effective, effectively avoids the toxicity of a carrier, is high in drug loading capacity and modification rate, and can be applied to preparation of tumor targeting drugs.

To provide a polyolefin polymer having a polar group represented by Formula (i) produced by modifying, with a high modification ratio, a double bond in a polymer having the double bond at one terminal, both terminals, or at the inside of a polymer chain thereof that is obtained by a known method; a method for producing the polyolefin polymer; and a water dispersion material and a mold release agent composition each containing the polyolefin polymer,

The invention discloses a surface modification method of nano silicon dioxide, which comprises the steps of adding nano silicon dioxide into a mixed solution of ethanol and water, carrying out ultrasonic treatment at room temperature for 15-25 minutes, regulating the pH value to 4-6 by using hydrochloric acid to obtain an acidic dispersion liquid, heating the acidic dispersion liquid to 90-100 DEG C, adding a fluorine-containing silane coupling agent, carrying out heat-preservation reaction for 20-30 hours, and drying the reaction liquid in a drying oven at the temperature of 70-90 DEG C to obtain the modified nano silicon dioxide. Nano silicon dioxide particles are modified by the tridecafluorooctyltriethoxysilane coupling agent, and hydroxyl groups on the surface of the nano silicon dioxide are replaced by the coupling agent, so that the dispersity, compatibility and stability of the nano silicon dioxide in an organic dispersing agent or a matrix are improved.

The invention belongs to the field of toxin detection, and relates to a photonic crystal sensing material for SEB ultra-sensitive detection, a preparation method of the photonic crystal sensing material and a method for ultra-sensitive detection of SEB. The preparation method comprises the following steps: carrying out hydrolysis reaction on tetraethyl orthosilicate to obtain silicon spheres; mixing and reacting the silicon spheres with 3-aminopropyl triethoxysilane to obtain aminated silicon spheres; carrying out contact reaction on an aqueous solution of aminated silicon spheres and a nanogold solution to obtain aminated silicon spheres SiO2-AuNPs modified with nanogold particles, preparing a SiO2-AuNPs microsphere suspension, performing drying in a constant-temperature drying oven, andperforming stacking to obtain photonic crystals; and adding the SEB aptamer of which the 5'end is modified with sulfydryl into the SiO2-AuNPs photonic crystal, and performing incubating to obtain theSEB aptamer-photonic crystal sensing material. The photonic crystal sensing material provided by the invention can realize ultrasensitive and label-free detection of SEB.

The present invention relates to a polymerization initiator represented by Formula 1, a modified conjugated diene-based polymer, methods for preparing them, a rubber composition comprising the modified conjugated diene-based polymer, and a tire prepared from the rubber composition.

(In Formula 1, the definition of each substituent is the same as defined in the description.)

The invention provides a preparation method for nanometer modified magnesium hydroxide. The objective of the invention is to provide the ultrafine magnesium hydroxide preparation method with the advantages of high yield, short process flow, no pollution during production, narrow particle size distribution and capacity of realizing ultra-refining and surface modification in one step. According to a technical scheme in the invention, the preparation method comprises the following steps: mixing, stirring and beating magnesium hydroxide powder with a particle size of 325 to 8000 meshes, a surface modifier and a solvent in a (weight) ratio of 1000: 1-80: 1000-5000; then allowing the obtained slurry to pass through grinding equipment, filling a grinding cavity with spherical medium grinding beads with a diameter of no more than 0.8 mm and carrying out grinding in an environment where a filling volume ratio is greater than 35% and the minimum movement speed of the grinding beads is greater than 10 m/s; and allowing the slurry obtained after grinding to pass through drying equipment so as to obtain surface-modified ultrafine magnesium hydroxide powder with average particle size distribution in a range of 50 to 500 nm.

The invention relates to an antibacterial and antiviral toilet lid and a preparation method thereof. The antibacterial and antiviral toilet lid is prepared from the following components in parts by weight: 60-70 parts of a resin material, 10-20 parts of a flame-retardant filler, 1.0-5.0 parts of a dispersing agent, 1.0-2.0 parts of an antioxidant and 0.5-1.0 part of a modified antibacterial and antiviral treatment agent, wherein the modified antibacterial and antiviral treatment agent adopts an organic silicon modified photocatalyst, and the organic silicon modified photocatalyst is obtained by modifying an inorganic photocatalyst antibacterial agent with an organic silicon release agent. In addition, the invention also discloses a preparation method of the antibacterial and antiviral toilet lid. On the premise of ensuring the antibacterial, antiviral and anti-mite effects of the toilet lid, the use amount of the antibacterial agent is greatly reduced.

The present invention relates to a substituted styrene-based compound represented by Formula 1 (refer to the specification and the scope of the claims), a method of preparing the styrene-based compound, a modified polymer including a functional group derived from the substituted styrene-based compound, a method of preparing the modified polymer, a rubber composition including the modified polymer, and a molded article manufactured from the rubber composition.

The invention relates to a deacidification agent based on sodium phytate-modified nano magnesium oxide and a preparation method of the deacidification agent. The preparation method comprises the following steps: firstly, respectively dispersing nano magnesium oxide and sodium phytate in deionized water and alcohol solvent; then, mixing the two solutions in proportion for modification; then, dispersing the modified nano magnesium oxide in the mixed solvent of perfluoroheptane and petroleum ether to obtain the target deacidification agent. The deacidification agent has advantages of easily available raw materials, mild reaction conditions, simplicity and convenience in preparation and use methods, low dosage, high efficiency and good and uniform deacidification effect.

The present invention relates to a modified polymer having a high modification ratio and an excellent affinity with a filler, a method of preparing the same, a rubber composition including the modified polymer, and a molded article prepared from the rubber composition. The modified polymer according to the present invention may exhibit a high modification ratio by including functional groups in a polymer main chain and on at least one end thereof, and thus, an affinity with a filler, such as silica, may be excellent. Also, the rubber composition according to the present invention may have excellent processability by including the modified polymer having an excellent affinity with the filler, and, as a result, a processed product (e.g., tire) prepared by using the rubber composition may have excellent tensile strength, abrasion resistance, and wet road surface resistance.

The present invention relates to a modifier represented by Formula 1, a method of preparing the same, a modified conjugated diene-based polymer having a high modification ratio which includes a modifier-derived functional group, and a method of preparing the polymer.