35results about How to "Increase osmotic resistance" patented technology

The invention discloses a clean viscous acid for acid fracturing of a carbonate reservoir, which is applied to the technical fields of acidification and acid fracturing of petroleum carbonate reservoirs. The clean viscous acid consists of the following components in percentage by weight: 3-7 percent of hexadecyl trimethyl ammonium bromide, 0.3-0.7 percent of sodium salicylate, 15-28 percent of hydrochloric acid, 0.125-0.25 percent of citric acid or 0.05-0.1 percent of CX-301 or 0.3-0.5 percent of TW-1 serving as an iron ion stabilizing agent, 0.2-0.25 percent of a diimidazoline quaternary ammonium salt and the balance of water. The clean viscous acid has high retardative property, the retarding rate can reach 42-56 percent, the fresh acid viscosity is 25-40 mPa.S, and the acid liquor viscosity rises during acid fracturing of the carbonate reservoir. When the hydrogen ion concentration falls till the pH is more than or equal to 2, the acid liquor viscosity rises for forming viscoelastic gel, the permeation resistance of an acid liquor in a high permeation layer is increased, and the length of an acid etching crack is prolonged. Reacted residual acid gel can undergo gel breaking automatically, is free from residues, is easy for discharging, and has small damage to stratums.

A high-pressure includes a liner; a composite material surrounding an outer circumferential surface of the liner; a heat-transfer sheet formed on the outer circumferential surface of the liner; and a spacer disposed between the heat-transfer sheet and the composite material. The heat-transfer sheet and the spacer have a gap therebetween.

The invention discloses an energy-saving nanofiltration membrane for a water purification system and a preparation method of the energy-saving nanofiltration membrane. The energy-saving nanofiltration membrane is composed of non-woven cloth, a polysulfone supporting layer, a loose polyamide separating layer and a dense positive charge thin layer. By properly hydrolyzing the dense nanofiltration membrane, the molecular weight cut-off of the nanofiltration membrane can be increased, and part of monovalent ions are selectively allowed to permeate while it is guaranteed that small organic molecules are effectively intercepted, so that the nanofiltration membrane still has a high permeation flux under high-salinity water inlet or a high recovery rate, and it is unnecessary to additionally increase operating pressure. By depositing the dense positive charge thin layer on the surface of the loose polyamide separating layer through electrostatic adsorption-chemical crosslinking, interception of the nanofiltration membrane on multivalent cations (such as calcium ions, magnesium ions, heavy metal and other substances harmful to the human body) in water can be easily improved, and drinking water safety can be guaranteed to a great degree; meanwhile, the thickness of the deposition coating can be effectively controlled within a certain range with the electrostatic adsorption technology, and thus substantial increase of permeation resistance can be avoided as far as possible.

The invention relates to a vacuum insulation plate with high strength and long service life, which comprises a core material, a high-performance separation film and a plastic protection layer, wherein the high-performance separation film is coated on the outer surface of the core material, the plastic protection layer is coated on the outer surface of the high-performance separation film, the core material mainly comprises the following components of silicon dioxide and oxide inorganic impurities; the high-performance separation film sequentially comprises a polyethylene layer, an aluminum foil layer, a polyethylene glycol terephthalate layer and a nylon layer; and the plastic protection layer comprises phenolic resin or epoxy resin or urea resin or furan resin and other thermosetting resins and liquid nitrile rubber. The vacuum insulation plate provided by the invention has the characteristics of difficulty in bearing physical and chemical damages, insensitivity of powder to vacuum degree, longer service life, difficulty in rebound deformation, and higher mechanical strength.

The present invention relates to an oil film bearing sealing unit, which comprises a neck sealing part and a rigid annular sealing end plate. The essential technical points of the oil film bearing sealing unit are as follows: the neck sealing part comprises an annular sealing body with a slot, and a sealing part plugged in the slot; wherein, the sealing part is arranged between the rigid annular sealing end plate and the annular sealing body and contacted with a sealing surface; the extended part of the annular sealing body, which is on the same side as the sealing part is, is an adsorption neck; the end of the adsorption neck is connected with a secondary water-sealing lip, a water-sealing crown and a primary water-sealing lip; the secondary water-sealing lip is contacted with the concave surface of a roll neck; the primary water-sealing lip is contacted with a squeezing end surface; the extended part of the annular sealing body, which is not on the same side as the sealing part is, is a primary oil-sealing lip, is contacted with the concave surface of the roll neck; the annular sealing body is also connected with an oil-throwing lip. The axial, radial and bi-directional end surfaces of the oil film bearing sealing unit are sealed, and as a result, not only water is effectively sealed, but also friction resistance is less. The sealing part has a long service life and can be independently replaced, and therefore the maintenance cost is reduced. The adaptability to axial mounting dimension errors is improved, and the affection of axial float is also reduced during operation.

The invention discloses a washable waterproof moisture-permeable foam adhesive laminated fabric and a preparation method thereof. The laminated fabric comprises a modified fabric, a foam adhesive anda waterproof film from bottom to top, the modified fabric is prepared from a cotton fabric, sodium hydroxide, oxalic acid, a first modifier and a second modifier; wherein the foam glue is obtained byfoaming a foaming agent; the waterproof membrane is prepared from a pretreatment membrane, polydimethylsiloxane and cyclohexane; the pretreatment film comprises a first waterproof layer and a second waterproof layer from bottom to top. The invention discloses a washable waterproof moisture-permeable foam adhesive laminated fabric and a preparation method thereof. The preparation method is simple in process operation and reasonable in component proportion, the waterproof film with hydrophobic, waterproof and moisture-permeable performance is attached to the surface of the modified fabric through a foam glue attaching method, and the prepared attached fabric has excellent waterproof and moisture-permeable performance, high hydrophobic performance, excellent washing resistance and high practicability.

The invention relates to a method for removing salt by using a three-dimensional carbon electrode, belonging to the field of sea water desalination. According to the method, natural wood is used as acarbon precursor, a three-dimensional carbon skeleton is prepared by using a process of firstly carrying out pre-carbonization and then activating, and the prepared three-dimensional carbon skeleton is prepared into a capacitor so as to be used for removing salt. The carbon skeleton has a large number of vertically aligned, parallel and low-bending macroporous channels, thus facilitating the direct transmission and diffusion of electrolyte ions. After activation is finished, a plurality of micropores are simultaneously formed inside the carbon skeleton, the micropores are distributed on the inner walls of ordered through holes, and the large number of micropores provide a place for salt ion electrosorption. Therefore, the carbon electrode of the structure significantly enhances the diffusion of the salt solution in the electrode, shortens the time and distance of the ions reaching the micropores, and finally improves the performance of desalting.

The invention belongs to the field of membrane separation, and especially relates to a grafted ionic liquid polyimide membrane, and a preparation method and an application thereof. Polyimide is grafted with an aminated functional ionic liquid, then the grafted ionic liquid polyimide membrane is prepared, and the prepared grafted ionic liquid polyimide membrane is used for carbon dioxide gas separation. The modified membrane obtained by the method for immobilizing the ionic liquid on the main chain of the polyimide through a Schiff base structure can increase the carbon dioxide permeation fluxand significantly improve the selectivity of the carbon dioxide gas.

The invention relates to a method for repairing a polyamide composite reverse osmosis membrane. The method comprises the following steps: firstly, carrying out membrane surface diazotization reaction on the polyamide reverse osmosis membrane with degraded performance by using an acid solution containing nitrite, controlling the pH (Potential of Hydrogen) range to be 0.5-3.0 and the concentration of sodium nitrite or potassium nitrite to be 0.05-2.00 wt%, and controlling the reaction mode to be single-sided coating or double-sided soaking for 5-30 minutes; and then carrying out 365 nm ultraviolet light illumination treatment on the diazotized membrane surface for 1-5 hours. The method has the advantages that the diazotization reaction is utilized to reconstruct the aniline structure contained in the polyamide reverse osmosis membrane separation layer with degraded performance, and more cis-azo structures are obtained on the membrane surface through simple ultraviolet irradiation, so that the permeation resistance of the separation layer to sodium ions is improved, the effect of repairing the desalination performance of the membrane is realized, and the service life of the membrane is prolonged. And the process is simple, wide in application range and easy for industrial application.

The invention discloses a combined bearing double-layer well wall and a construction method thereof, and belongs to the technical field of double-layer well wall construction. The combined bearing double-layer well wall comprises an inner-layer well wall and an outer-layer well wall, the outer-layer well wall is formed by tunneling and pouring in sections, and construction joints exist between the sections of the outer-layer well wall; the inner-layer well wall is formed by continuous casting; and a gap is formed between the inner-layer well wall and the outer-layer well wall, and a micro-expansion grouting material is injected into the gap to form a micro-expansion interlayer. The micro-expansion grouting material is adopted for grouting between the inner-layer well wall and the outer-layer well wall, and the solidified slurry can tightly bond the inner-layer well wall and the outer-layer well wall and compactly fill water seepage channels in the outer-layer well wall and the stratum close to the well wall.

The invention relates to flame-retardant ultralow-heat-conductivity-coefficient PFU foam and a manufacturing method thereof. The flame-retardant ultralow-heat-conductivity-coefficient PFU foam is prepared from PFU resin, a foam stabilizer, a catalyst, a modifier, a foaming agent and the like. The preparation method comprises steps: mixing the raw materials in proportion and then stirring to be uniform to obtain a mixture; mixing the mixture with isocyanate, uniformly stirring at a high speed, and injecting into a mold; and foaming, curing and molding the mold at the temperature of 55-65 DEG Cto obtain the flame-retardant ultralow-heat-conductivity-coefficient PFU foam. Compared with the prior art, the PFU foam disclosed by the invention not only has excellent physical properties of polyurethane foam, but also has excellent properties of phenolic foam, such as flame retardancy, acid corrosion resistance, surface carbonization when meeting fire, self-extinguishing when leaving fire andthe like; in addition, the highest oxygen index can reach 30 or above, and the combustion performance grade can reach the flame-retardant B1 grade; the heat conductivity coefficient of the material isextremely low and can reach 0.0162 W/K.m. In addition, the material has excellent properties of heat insulation, light weight, high strength and the like, so that the material has the best heat preservation effect in organic heat preservation materials.

The invention discloses an underwater power supply and a waterproof shell thereof. The waterproof shell of the underwater power supply comprises a power supply shell and two output terminals embeddedin a side plate of the power supply shell; and each output terminal comprises a first inserting part exposed on the outer surface of the side plate, a second inserting part exposed on the inner surface of the side plate, and a connecting part embedded in the side plate and used for connecting the first inserting part and the second inserting part in a bent shape. According to the waterproof shellof the underwater power supply, the output terminals are embedded in the power supply shell in the form of injection molding and the like, and form an integrated structure together with the power supply shell, and an assembly process and a gap formed by assembly are removed, so that the problem of water seepage is avoided, and the waterproof sealing performance of the underwater power supply shellis improved.