151results about How to "Reduce penetration resistance" patented technology

The invention relates to a ceramic membrane tube support and a preparation method thereof and belongs to the technical field of ceramic materials. The ceramic membrane tube support and the preparation method thereof are characterized in that the ceramic membrane tube support comprises a plurality of channels and at least one filtrate chamber, at least one water discharging channel is included in the support and penetrates through the whole support axially or is evenly distributed on the support axially, the angle formed by the at least one water discharging channel and the axial direction of the support is 90 degrees, the angle formed by the at least one water discharging channel and the at least one filtrate chamber is 0-90 degrees, the filtrate chambers corresponding to the at least one water discharging channel on the upper surface and the lower surface of the ceramic membrane tube are plugged and sealed by utilizing high polymer materials or rubber materials or plugged by slurry for producing the support, and finally integrated with the ceramic membrane tube through drying and sintering. The prepared ceramic membrane tube is large in surface area and multi-channel, the defect of large filtration resistance of filtrate in the ceramic membrane tube is overcome, and separation and permeability efficiencies are improved. According to the ceramic membrane tube support and the preparation method thereof, the preparation technology is simple, the production cost is low, and the ceramic membrane tube support can be widely applied to the water treatment field or other liquid filtering processes.

A method for manufacturing a lithium ion secondary battery having electrodes in which a mix layer including a first binder and one of a positive electrode active material and a negative electrode active material is formed via a second binder on a collector. The method includes: performing pattern coating of the second binder on the surface of the collector and regularly forming binder-coated sections and uncoated sections; and feeding a powder of mix particles on the binder-coated sections and the uncoated sections so as to form the mix layer on the collector.

The invention relates to a hollow fiber compound nanofiltration membrane. The nanofiltration membrane takes a porous supporting layer as an inner layer and a separating function layer as an outer layer. A casting membrane solution of the porous supporting layer contains an inner layer macromolecular polymer which is selected from one or more of polysulfone, polyether sulfone, polyvinylidene fluoride, polyvinyl chloride and polyacrylonitrile; a casting membrane solution of the separating function layer contains an outer layer macromolecular polymer which is selected from one or more of polyetherimide, polyether-ether-ketone, sulfonated polyether-ether-ketone, polymethyl methacrylate and polyvinyl alcohol; a preparation method comprises the following steps: synchronously extruding and molding the inner layer casting membrane solution and the outer layer casting membrane solution; solidifying to obtain a membrane filament in a nascent state; and carrying out an oxidizing agent aqueous solution to obtain the hollow fiber compound nanofiltration membrane. The invention further provides the preparation method of the nanofiltration membrane correspondingly. According to the hollow fiber compound nanofiltration membrane provided by the invention, the flux of the nanofiltration membrane is remarkably improved, and moreover, the nanofiltration membrane further has the certain desalinization rate.

The invention discloses a method for preparing a step micro-needle array in the technical field of biomedical engineering. The method comprises the following steps of: gapping a silicon etching window on a silicon chip through photoetching and performing wet etching on the silicon in the silicon etching window; cutting the silicon chip to obtain a micro square column array by using a slicing machine, and further cutting the micro square column array to obtain micro square blocks; and finally performing the wet etching on the micro square column array to obtain the step micro-needle array. Micro-needle arrays with different heights are prepared by the method, and the micro-needle arrays puncture into the skin in a progressive mode. Meanwhile, the method has the advantage of simple preparation process, and the step micro-needle array is prepared by adopting the method of combining the wet etching with machining, so the cost is low and the method is convenient to popularize.

The invention discloses a forward osmosis membrane based on interface hydrophilic modification. The forward osmosis membrane comprises a separation peel layer arranged on the surface, a porous support layer arranged in the middle and a non-woven fabric support material arranged at the lower part. The forward osmosis membrane is characterized in that a hydrophilic polymer layer is also arranged between the porous support layer and the non-woven fabric support material, and is embedded into the non-woven fabric support material; the non-woven fabric support material is made of polyolefin or polyester. The hydrophilic polymer can also be interlinked through a crosslinking agent. The forward osmosis membrane has the advantages that through the hydrophilic modification, on the one hand, the permeation resistance of water in a permeation process is reduced, and the water flux is improved, and on the other hand, in a phase inversion process, the water can easily permeate, so that an instant phase inversion can be more easily generated; a large pore structure is formed; the porosity is improved; the sinuosity of pores is reduced, so that the inner concentration polarization can be obviously reduced; the water flux of the membrane is improved.

The invention provides a construction method of a large-diameter crushed stone pile. The construction method comprises the following construction steps of: cleaning miscellaneous fill on the surface layer of a soft foundation; when mountain stones are filled on the surface layer, firstly carrying out punching and hole guiding work and penetrating through a stone filling layer; sinking a large-diameter thin-wall steel sleeve with the outer diameter of 800-1600mm into the soft foundation until the depth reaches to a designed depth; constructing and finishing dry soil taking and hole forming work in the large-diameter thin-wall steel sleeve; matching a water pumping and discharging measure and completely draining water in a drainage hole; filling crushed stones in the hole by layers, and tamping and filling by layers, wherein the thickness for tamping by layers is more than 3m; tamping and filling by layers until the height is 50cm higher than a designed pile top mark height; pulling out the large-diameter thin-wall steel sleeve from the soft foundation; and forming the large-diameter crushed stone pile with the outer diameter of 800-1600mm in the soft foundation. The construction method has the advantages of low requirements on construction equipment, low construction difficulty, controllable quality of the prepared crushed stone pile, high bearing capability of the pile foundation, good water discharging capability and the like; and the prepared crushed stone pile is mainly applied to compound foundation or water discharging solidification treatment of buildings including a stacking field, a road, a large-size steel storage port foundation and the like on a large-area deep and thick soft foundation.

The invention discloses a method for preparing a high-throughput ultrafiltration membrane from nano calcium carbonate doped polysulfone. The method comprises the steps of taking the polysulfone as a polymer membrane material and nano calcium carbonate as a doped particle to prepare membrane casting liquid, preparing a membrane by a nonsolvent-induced phase separation method, and treating with a hydrochloric acid aqueous solution at a certain concentration for a period of time to form the high-throughput ultrafiltration membrane. The prepared ultrafiltration membrane can be used for ultrafiltration and serve as a basement membrane for preparing a nanofiltration and reverse osmosis composite membrane. The throughput of the ultrafiltration membrane is greater than that of the pure polysulfone under the same pressure, and an entrapment rate of bovine serum albumin is not changed basically.

The invention discloses a high selective separability nanofiltration membrane preparation method which comprises the following steps: (1) preparing a separation layer with high flux and a low inorganic salt removing rate; (2) preparing a separation layer with high negative charge density. The high selective separability nanofiltration membrane preparation method disclosed by the invention has theadvantages that the defined amount of dendritic polyfunctional group membrane material is added into a water phase solution to form a polypiperazine-amide separation layer with smaller osmotic resistance; then interface polymerization reaction is utilized to finish residual acyl chloride groups on the surface of an initial polypiperazine-amide membrane, reacting with strong-electronegativity compound containing hydroxyl or amino and utilizing a chemical bond mode to durably enhance membrane surface electronegativity to obtain a high selective separability nanofiltration membrane. In addition,as the introduced strong-electronegativity compound contains sulfonic acid groups or phosphate groups, an isoelectric point is lower than that of a general polypiperazine-amide nanofiltration membrane, and the electronegativity of the membrane surface can be kept under a lower pH value; thus, a wider pH value application range is obtained.

The invention provides an offshore wind turbine single pile foundation with radial rib plates and an anti-scouring cover. The offshore wind turbine single pile foundation comprises a tubular pile, a cylinder part and a conical cover body, wherein the tubular pile is a hollow cylinder; multiple rib plates are arranged on the outer side wall of the tubular pile, and are outwards distributed in a radial form along the outer side wall of the tubular pile; the cylinder part coats the outer sides of the rib plates, and is connected with the tubular pile through the rib plates; the inner wall of thecylinder part is connected with the upper edges of the rib plates to enhance the integrity of the single pile foundation; the conical cover body is used for preventing waves from scouring a seabed, coats the tubular pile, and is positioned above the cylinder part; a large end of the conical cover body is contacted with the cylinder part; the outer diameter of the large end of the conical cover body is matched with the outer diameter of the cylinder part; and the inner diameter of a small end of the conical cover body is matched with the outer diameter of the tubular pile. The offshore wind turbine single pile foundation improves the bearing capacity and the antiskid and anti-overturning stability of the single pile foundation, and meanwhile, can prevent scouring through setting the conicalcover body to improve the stability and the anti-scouring capacity.

The invention relates to a method for constructing a soil ploughing layer of a south-Xinjiang oasis drop-irrigation continuous-cropping middle-low-yield cotton field. The method includes the steps that before sowing in the cotton field, straw of last crops is smashed and returned to the field; farmyard manure and chemical fertilizer are applied; deep ploughing, cotton field flattening and super-deep scarification are conducted; irrigation is conducted before sowing; sowing is conducted; furrows are dug in the cotton field, and anti-salt plants are planted; a windbreak tree belt is built on the periphery of the cotton field; a water-irrigation and drainage trench system is built; field management is conducted. After the method is adopted, the surveying result shows that the soil water content in the seedling stage is increased by 0.5%, rapidly-available potassium of the ploughing layer is increased by 35.2%, the temperature of soil 5 cm lower than films is increased by 0.6 DEG C, the thickness of the ploughing layer in the seedling period is increased by 7.1 cm, the salt content of soil is reduced by 2.1 g/kg, the soil porosity is increased by 8.5%, the soil penetration resistance (PSI) is reduced by 130, the soil bulk density is reduced by 0.11 g/cm<3>, the pH value of soil is reduced by 0.4, the residual film content of soil of the ploughing layer is reduced by 11.3 kg per mu, premature senescence of the cotton field is avoided, the yield of seed cotton is increased by 57.5 kg per mu, and therefore the method has the soil-improving and yield-increasing effects and can meet production requirements.

The invention discloses an intermittent ultrasonic assisted low-salt salted egg pickling technology. Low-salt salted eggs can be obtained with the technology through pretreatment of duck eggs, pickling of duck eggs, desalting and cleaning. An ultrasonic technology is creatively used in assisting the salted egg pickling process, the table salt permeation rate is increased, the pickling period is shortened, the salted eggs can be well pickled within 15 days with the technology, and the pickling period is 20 days shorter than that in a traditional method. The well pickled salted eggs are placed in a 1% table salt solution to be desalted, the salt content of salted egg white can be decreased to 3.58% within 6 days, and the salinity is proper. In general, salted eggs with high oil yield and lowsalt can be pickled within 21 days.

The invention relates to a preparation method of a glass hollow fiber nanofiltration membrane with an asymmetric pore structure. The method comprises the following steps: preparing sodium borosilicate glass after fusing a sodium salt A, a boron compound B and a silicon compound C, and then crushing, ball-milling and sieving to obtain sodium borosilicate glass powder; preparing a polymer solution, adding the glass powder to the polymer solution, stirring to evenly disperse, so as to obtain a spinning solution; carrying out stewing and defoaming treatment; extruding from a spinning nozzle under the pressure action of nitrogen; enabling the spinning solution to enter a coagulating bath, so as to obtain a hollow fiber membrane green body; soaking the green body into running water, so that an organic solvent is fully dissolved into water; drying the hollow fiber membrane green body and then processing by a sintering technology, so as to obtain the hollow fiber membrane green body; putting the membrane into an acid liquor to corrode, so as to obtain the glass hollow fiber nanofiltration membrane with the asymmetric pore structure. The method disclosed by the invention is simple in technology, free of expensive equipment, and low in sintering temperature, and the prepared glass hollow fiber nanofiltration membrane has the asymmetric pore structure, and can be applied to the fields such as gas separation and ion separation.

The invention discloses a high-intensity water-resistance corrugated board and a preparation method of the high-intensity water-resistance corrugated board according to the national standard GB/T22873-2008. The high-intensity water-resistance corrugated board comprises surface paper and inner paper, wherein a corrugated paper layer is arranged between the surface paper and the inner paper; a high-intensity water-resistance adhesive is coated between the peak surface of the corrugated paper layer and the surface paper as well as the inner paper; a special water-resistance additive is added into the conventional corrugated board adhesive; and various technological parameters of a board automatic line are optimized by an ultrafine particle pulping technology, so that the water resistance of the corrugated board is greatly improved and is much higher than the advanced level of products of the same type in foreign countries.

The invention discloses a film casting solution of a PVDF hollow fiber ultrafiltration film as well as a spinning mechanism and a production method, and belongs to the technical field of polymer filmpreparation. The method comprises the following steps: 1) preparing the film casting solution, namely heating a stirring kettle to 110-150 DEG C in advance, adding PVDF, a poor solvent, a water-soluble good solvent and an additive into the stirring kettle, stirring and dissolving to form a uniform and transparent viscous solution, reducing the stirring speed, and defoaming the film casting solution for 8-12 hours in a heat preservation state; and 2) performing composite film spinning: spinning by using a dry-wet spinning machine by adopting a composite thermally induced phase separation methodto prepare the PVDF hollow fiber ultrafiltration film. The invention relates to the film casting solution of the PVDF hollow fiber ultrafiltration film as well as the spinning mechanism and the production method. Microstructures and crystal forms of surfaces and sections of film filaments are regulated and controlled through process parameter control, and the hollow fiber composite film which iscompact in surface layer, has spongy penetrating network pore structure in lower layer and is tightly combined with a supporting pipe is prepared.