34results about How to "Release speed controllable" patented technology

The invention provides a polymer microsphere for oil field profile control and water plugging and a preparation method thereof. The polymer microsphere is of a three-layer spherical structure, and comprises a positive ion inner core, a middle oleophilic casing layer and an outer layer negative ion hydrophilic casing layer, wherein the positive ion inner core comprises acrylamide, cationic monomers and crosslinking agent copolymers; the middle oleophilic casing layer comprises acrylamide, oleophilic monomers and cross linking copolymers; the outer layer negative ion hydrophilic casing layer comprises acrylamide, anionic monomers and crosslinking agent copolymers. The polymer microsphere prepared according to the invention has the advantages that the particle diameter range is controllable in the dimension range of 1 to 500 mu. m; in the use process, the outer hydrophilic casing layer and the middle oleophilic casing layer are gradually degraded along with the prolonging of the water dissolution time; the inner core has good water absorption expansion performance; the dimension after the sufficient expansion reaches 30 to 1500 mu. m; good expansion performance and good plugging performance are realized. The polymer microsphere is solid powder; the storage is convenient; the stability is high; the validity period is 3 to 5 years; in the use process, the addition of other auxiliary agents is not needed; the polymer microsphere can be fast dispersed in the solvent.

The invention discloses a spinning solution, nuclear shell nanofiber as well as a preparation method and application thereof. A hydrophobic drug and polyvinyl alcohol (PVA)/polyethylene glycol-b-poly(p-dioxanone) (PEG-b-PPDO) are blended to obtain a spinning solution system, and the nuclear shell nanofiber is directly formed by utilizing a single-axis spinneret under a high-voltage electrostatic effect. The preparation method disclosed by the invention has the advantages of simple equipment, mild conditions, simple flow and low energy consumption, can be used for achieving the aims of high-efficiency embedding of the hydrophobic drug, controllable drug release speed and long sustained release time, and is very suitable for industrial production.

The invention discloses application of oleanolic acid in preparing a marine environment-friendly antifouling agent, and relates to an antifouling agent, in particular to application of a natural active material oleanolic acid as the marine environment-friendly antifouling agent. The oleanolic acid applied to a marine antifouling coating can prevent marine plants from adhering and growing on the surfaces of submarine artificial facilities such as the bottom of a ship, an offshore oil-gas platform, a buoyage, a wharf, a bridge pier, a seawater pipeline, an aquaculture net cage, and the like. The invention provides application of the oleanolic acid in preparing the marine environment-friendly antifouling agent and the marine antifouling coating.

In order to solve the problems of lacked denitrification carbon sources, short carbon source release time, poor controlled release performance of additionally added carbon source materials, easy secondary pollution generation and the like in the underground water nitrate pollution biological restoration process, the invention provides a preparation method of controlled release carbon source carriers, which belongs to the technical field of water treatment. Novel carbon source carrier materials using cyclodextrin as active controlled release ingredients comprise the preparation steps of cyclodextrin monomer polymerization, carbon source inclusion and pelleting forming. The preparation process of the invention is relatively simple, the prepared carbon source materials have good mechanical and hydraulic performance, and the long-time effectively controlled release of the carbon sources in the biological denitrification process can be realized.

The invention provides an antifouling agent, which is a natural active compound extracted from rotenone, and has the advantages of high performance, environmental friendliness and good lipophilicity. Its molecular formula is C23H22O6, the molecular weight is 394.42, the structural formula is disclosed in the specification.

The invention relates to a calcium alginate porous membrane containing metal ion-carrying zirconium phosphate and a preparation method of the calcium alginate porous membrane, and belongs to the fieldof biomedical materials. The calcium alginate porous membrane containing metal ion-carrying zirconium phosphate is characterized in that the matrix material of the porous membrane is composed of calcium alginate, and metal ion-carrying zirconium phosphate is uniformly dispersed in the calcium alginate matrix. Functional metal ion-carrying zirconium phosphate is added on the basis of calcium alginate, so that the calcium alginate porous membrane has better biomedical performance than that of pure calcium alginate as wound dressing, and can replace the pure calcium alginate dressing to be applied to management of skin wounds caused by various diseases accordingly. The preparation technology is simple, the manufacturing cost is relatively low, and large-scale production can be realized.

The invention belongs to the technical field of disinfectants, and particularly relates to a slow-release chlorine dioxide disinfectant and a preparation method thereof. The invention discloses a slow-release chlorine dioxide disinfectant. The disinfectant comprises a slow-release agent and a chlorine dioxide generator, wherein the chlorine dioxide generator comprises the following components in parts by weight: 10-20 parts of chlorite, 10-15 parts of an activating agent and 3-6 parts of a filling agent. According to the slow-release chlorine dioxide disinfectant prepared by the invention, theaction of the external environment on chlorine dioxide is isolated, the thermal stability, the light stability and the transportation impact stability of chlorine dioxide are improved, and the slow-release chlorine dioxide disinfectant has high safety, controllable release speed and double effects of slow release and safety explosion prevention; the initial chlorine dioxide content and the long-time chlorine dioxide content of the slow-release chlorine dioxide disinfectant prepared by the method are optimal for air purification effect, escherichia coli sterilization effect and formaldehyde removal effect, and the slow-release chlorine dioxide disinfectant is low in unit disinfection efficiency cost, convenient to use and wide in applicability.

The invention relates to a compound with antifouling activity and the distilling method as well as the application, in particular to an isoquinoline compound, and provides a compound with antifouling activity and the distilling method as well as the application. The compound is 3-methoxy-5 hydroxy-7-aldehyde group isoquinoline, and the molecular formula is C11H9NO3. Dry root of excoecaria agallocha is crushed to obtain root shivers; the shivers are dipped into solvents to obtain extracting solutions; the extracting solution goes through filtration and decompression, and the dry solvent is made into extracts; the extracts are scattered in water and distilled with ethyl acetate, which is removed to obtain crude products; the crude products are processed with petroleum aether; the acetone is used as eluent to purify the silica gel column, which is re-crystallized in the acetone. And then, methanol is used as solvents to refine the silica gel column to obtain the pure compound with the antifouling activity (3-methoxy-5 hydroxy-7-aldehyde group isoquinoline). The compound can be used for producing high-efficiency antifouling agents.

The invention discloses a method for preparing a degradable antibacterial medical dressing material. The method comprises the following steps: S1, establishing a drug-loading system: mixing laponite LAP and an anti-inflammatory drug according to a ratio of (0.1-1):1, and performing stirring to wrap the anti-inflammatory drug in the laponite LAP to prepare an LAP-anti-inflammatory drug system; andS2, dissolving polylactic acid PLA or polycaprolactone PCL or poly(DL-lactic acid) PDLLA in chloroform or dichloromethane or N,N-dimethylformamide DMF or hexafluoroisopropanol HFIP to prepare a solution of 10-50% w/v, then performing mixing with the LAP-anti-inflammatory drug system prepared in the S1, and performing magnetic stirring to make the mixture be dissolved to obtain an electro-spinningsolution. The whole method has the advantages such as simple operation, low cost, mild conditions, and environmental friendliness. The cytotoxicity detected by an MTT reagent shows that the dressing film material is non-cytotoxic, namely the cell compatibility is good. The in vitro drug release experiment shows that the dressing film material has a controllable drug release rate, and the drug loading efficiency is high.

The invention discloses the use of shikonin or a derivative thereof as an antifouling agent for preventing the attachment of large fouling organisms. The natural product shikonin or its derivatives in comfrey can prevent large-scale fouling organisms, especially marine large-scale fouling organisms, from attaching to the surface of artificial facilities in the sea such as ships, buoys, docks, marine monitoring equipment or aquaculture equipment. A natural and environmentally friendly antifouling agent that can be used in antifouling coatings.

The invention discloses a demounting and mounting tool used for fixed type inner magnetic steel of a corrugated spring. The demounting and mounting tool comprises a sleeve, a locking sleeve, ring sleeves and a fixing ring. The sleeve is a hollow cylinder body, one end of the sleeve is provided with an outer thread, and the other end of the sleeve is provided with a protruding step. The locking sleeve is a ring with an L-shaped cross section, and the locking sleeve is provided with an inner thread. The outer thread of the end portion of the sleeve is matched with the inner thread of the lockingsleeve, and the locking sleeve is screwed to the end portion of the sleeve through the threads. The ring sleeves are two semicircular rings provided with grooves, and the shape of the grooves is matched with the protruding step on the sleeve. The grooves of the two ring sleeves are clamped to the step of the sleeve to form a complete ring. The fixing ring is a ring with an L-shaped cross sectionand is arranged on the sleeve in a sleeving manner, the diameter of an inner hole of the end face of the fixing ring is matched with the outer diameter of the sleeve, the inner diameter of the ring ismatched with the outer diameter of the ring sleeves, and the ring sleeves are fixed. By means of the demounting and mounting tool used for the fixed type inner magnetic steel of the corrugated spring, the corrugated spring is pressed by rotating the locking sleeve, and the problem that demounting and mounting cannot be conducted by labor is solved.