47results about How to "Uniform hole formation" patented technology

The melt spinning process of producing hollow fiber membrane includes the first mixing inorganic particle, polymer pore creating agent, surfactant and non-solvent to constitute spinning composition, heating the composition to temperature higher than the smelting point of the polymer, the subsequent extruding the melt through spinning head and cooling to form hollow fiber, and final eliminating the inorganic particle, polymer pore creating agent, surfactant and non-solvent to produce the hollow fiber membrane. The spinning composition consists of polymer 20-90 wt%, inorganic pore creating agent 5-50 wt%, polymer pore creating agent 1-30 wt%, surfactant 0.05-20 wt%, and organic non-solvent 1-60 wt%.

The invention discloses a supported high-porosity porous metal oxide material, and a preparation method and application thereof, and belongs to the technical fields of advanced functional materials and nano materials. The method comprises the following steps: firstly, adding a pre-hydrolyzed silicon oxide oligomer solution into a mixed solution of a metal salt and a load, uniformly carrying out stirring, and then removing the solvent by evaporation to obtain a metal hydroxyl oxide solid uniformly doped with a silicon oxide oligomer; and further calcining the solid to crystallize the metal oxide, and then removing silicon oxide by etching through an alkaline solution to form pores, so that the high-porosity supported porous metal oxide material is obtained. The material has a crystallized metal oxide skeleton, high specific surface area and porosity and a three-dimensional communicated multi-stage pore channel, so that diffusion and mass transfer of gas and liquid in the material are facilitated, and then the material has excellent performance in the fields of gas sensing, heterogeneous catalysis and the like. The method disclosed by the invention is simple to operate, has easily available raw materials, and is suitable for large-scale industrial production.

The invention relates to a preparation method of a high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm, the high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm prepared by the method and a lithium battery comprising the high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm. The prepared high-heat-resistance vinylidene fluoride polymer mixed coating diaphragm has good heat resistance and air permeability and is formed by one-time coating with simple process. The vinylidene fluoride polymer improves the adhesion between the coating andthe diaphragm and between the coating and the pole pieces, increases the liquid storage capacity of the electrolyte and improves the cycle performance of the lithium battery. The heat-resistant additive forms a heat-resistant network layer with ceramics to improve the heat shrinkage performance of the diaphragm.

The invention discloses a preparation method for an ultrathin polyolefin microporous membrane, and a polyolefin microporous membrane prepared by the same. The preparation method comprises the steps of tape casting a polyolefin melt into a substrate, annealing the substrate, stretching at a drawing ratio of 1.0-2.5, and performing thermosetting treatment to prepare the polyolefin microporous membrane. The stretching step includes cold stretching and stepwise hot stretching, wherein the conditions for the stepwise hot drawing stretching are as follows: a number of stretching points is 10-30; a stretching rate per stretching point is smaller than or equal to 200%/min; and a stretching temperature at each stretching point is from Tm-90 DEG C to Tm-15 DEGC, wherein Tm represents a melting point of the polyolefin. The method is characterized in that the prepared polyolefin microporous membrane has the characteristic of very uniform pore structure by stepwise hot stretching at relatively low stretching rate through a plurality of stretching points. Besides, the method is very suitable for making the ultrathin polyolefin microporous membrane with the thickness of 6-14 [mu]m. The polyolefin microporous membrane can meet applications having relatively high requirements for pore-forming homogeneity of the microporous membrane and the thickness of the membrane, and is particularly suitable for the fields of battery diaphragms.

The invention discloses a preparation method of polypropylene type brush filaments, the method comprises the following steps: step 1, preparation of a polypropylene matrix material, to be more specific, polypropylene is soaked for 1-2h by using an activation elasticizing liquid at a soaking temperature of 65-75 DEG C, then dried at room temperature, and subjected to silane activation treatment. According to the invention, the surface activity of the polypropylene is improved by rare earth lanthanum chloride, and then the surface is dispersed and modified by a flexible medium so as to improve the surface tissue structure and achieve a flexible elasticization effect; by combination of the effects of the activation elasticizing liquid and the electric field, the flexible medium can be bettercontacted with a polypropylene material to improve the treatment effect; and then coupling treatment is adopted to improve the surface activity energy and enhance the adhesive force between the polypropylene and other materials to compound a prepared polypropylene matrix with nitrile rubber and a high-rebound polymer polyol, and then an adhesive reinforcing solution is adopted to improve the adhesive force among raw materials and improve the overall resilience.

A melt-spinning preparation method of a polyvinylidene fluoride hollow fiber filter membrane includes steps: S1, subjecting, by weight, 18-35 parts of polyvinylidene fluoride, 10-30 parts of a solvent, 40-60 parts of inorganic particles, 1-3 parts of a coupling agent and 2-6 parts of a hydrophilic polymer to high-speed mixing at the room temperature to obtain uniform mixed powder; extruding the mixed powder at 170-220 DEG C through a double-screw extruder to obtain uniform particles. The method has advantages that an inorganic filler material, the organic solvent, the coupling agent and a macromolecular pore-forming agent are highly mixed and blended through the double-screw extruder to form the uniform particles; then an annular spinneret plate of a single-screw extruder is adopted for making the uniform particles into fibers; the fibers are subjected to stretching, acid soaking and washing to obtain the hollow fiber filter membrane. In addition, member fibers produced according to the method has advantages of simple production process, low cost, high flux and uniformity in pore forming.

The invention discloses an optical glass polishing disk and a manufacturing method thereof. A polishing disc raw material comprises the following components in percentage by weight: 30-45% of polishing powder, 6-18% of resin, 10-22% a pore forming substance, 0.2-20% of aminolipin, 8-18% of a curing agent and 8-18% of a catalyst. By improving the formula of the polishing disc, the dosage of the polishing powder is reduced directly, the manufacturing cost is lowered, the environmental pollution is reduced, and damage on human body can be also reduced. The added aminolipin organic high-molecularpolymer in cross-linking reaction with resin is high in adhesive force and good in toughness. The polishing powder after coordinated bonding is high in Moh's hardness, and the grinding force of the optical glass polishing disk is enhanced; finally, the polishing disc is high in light out-coupling efficiency, good in polishing effect and durable. 300-400 tons of rare earth polishing powder can be saved by only one county of Pujiang every year.

The invention relates to a preparation method for a filamentous vinylidene fluoride polymer composite coated diaphragm, a filamentous vinylidene fluoride polymer composite coated diaphragm prepared bythe method and a lithium battery comprising the filamentous vinylidene fluoride polymer composite coated diaphragm. The prepared filamentous vinylidene fluoride polymer composite diaphragm is uniformin vinylidene fluoride polymer coating, large in porosity and good in air permeability, the air permeability of a coated film cannot be increased, the binding power between the diaphragm and a pole piece is improved, the electrolyte storage capacity is improved, and the cycle performance of a lithium battery is improved.

The invention discloses aramid fiber slurry and a preparation method thereof, and a diaphragm based on the aramid fiber slurry; the preparation method of the aramid fiber slurry comprises the following steps of preparing a first solution and a second solution, mixing the first solution with dimethylacetamide, stirring to be uniform, adding water, stirring until uniform, adding isopropyl alcohol, stirring until the mixture is uniform, adding dimethyl carbonate, stirring until the mixture is uniform, adding the second solution, and uniformly stirring to obtain the aramid fiber slurry. The aramidfiber slurry contains alcohol, water and ester, and the three non-solvents (alcohol, water and ester) are creatively adjusted, enabling alcohol, water and ester to occupy the position of the aramid fiber slurry under the combined action of alcohol, water and ester; and after the aramid fiber is cured by pure water, the non-solvent is uniformly dissolved in water, so that the extraction effect isachieved, and uniform pore forming of the aramid fiber is realized.

The invention discloses a method for preparing porous ceramic from coal gangue. The method is characterized by comprising the following steps of: carrying out acid reaction pretreatment on coal gangue, carrying out melting pretreatment on the coal gangue, adding citric acid and a protective agent, carrying out mixing, stirring until the materials are molten, carrying out mixing, drying to obtain coal gangue powder, screening the coal gangue powder, adding a proper amount of paraffin oil, carrying out aging, carrying out injection molding, carrying out degreasing, carrying out low-temperature calcination, and carrying out pressurized high-temperature calcination to obtain porous ceramic, wherein the protective agent is calcium citrate porous carbon. The method has the beneficial effects that pore forming is completed in a biscuit forming stage by utilizing capillary force formed between raw material solid particles and two liquid phases; and alumina of coal gangue and a citric acid principle are utilized, calcium citrate porous carbon is creatively added, high-pressure calcination is carried out, generated molten aluminum chloride is protected, pore forming is completed by utilizingcapillary force formed between raw material solid particles and two liquid phases, silicon and aluminum oxides of coal gangue are fully utilized, and the porous ceramic with catalytic activity is generated by adopting a one-step method.

The invention relates to a preparation method of a lithium ion battery diaphragm. The preparation method comprises the following steps: mixing ultrahigh molecular weight polyethylene and a solvent, and heating and stirring for the first time to obtain a pre-swelling mixed solution; grinding the pre-swelling mixed solution, then adding a fluorine-containing polymer, and heating and stirring for thesecond time to obtain a dispersion solution; carrying out melt extrusion on the dispersion liquid to obtain a plasticized melt film; and carrying out post-treatment on the plasticized melt film. According to the preparation method disclosed by the invention, the ultra-high molecular weight polyethylene can be uniformly plasticized, the formed diaphragm is uniform in thickness distribution, and the method has the advantage of being uniform in micropore size and distribution, small in high-temperature thermal shrinkage, high in puncture strength and high in diaphragm breaking temperature.

The invention provides a punching assembly of a plastic film production system. A frame is provided with a discharging roller, and the discharge side of the discharging roller is provided with a laser punching mechanism. The laser punching mechanism comprises a hanging mechanism, at least two sets of drilling assemblies are provided on the hanging mechanism, and the drilling assemblies include a slider, a supporting rod and a laser puncher. The slider can be horizontally and slidingly disposed on the hanging mechanism, and a first driving device drives the slider to move left and right. The supporting rod is slidingly disposed on the slider, and a second driving device drives the supporting rod to move back and forth. According to the laser drilling device for the plastic film production system, the operation is simple, holes are formed uniformly, and the size, shape and separation distance and number of rows of the holes can be adjusted according to the requirements of production; labor intensity is low, work efficiency is high, and the laser drilling device for the plastic film production system is suitable for continuous production in enterprises.

The invention relates to a preparation method of high-reinforcing titanium dioxide for a water-based coating, and belongs to the technical field of the preparation of titanium dioxide functional materials. The preparation method comprises the following steps: A) preparation of paste: mixing titanium dioxide and inorganic mineral powder in distilled water, adding a dispersant, stirring to prepare mixed paste of the inorganic mineral powder and titanium dioxide; B) preparation of slurry: adding a pore forming agent into the mixed paste of step A, and high-speed stirring to prepare the slurry; C)preparation of a pore-forming composite: performing spray drying on the slurry prepared in step B in a spray dryer to prepare a composite of pore-forming titanium dioxide and inorganic minerals; andD) preparation of high-reinforcing titanium dioxide: enabling the pore-forming composite prepared in step C to be subjected to airflow pulverization in an airflow pulverizer, and performing organic coating treatment during the airflow pulverization to prepare the high-reinforcing titanium dioxide. The high-reinforcing titanium dioxide prepared by the method is used in the water-based coating to improve the weather resistance, bonding strength, crack resistance, color change resistance and the like of a coating layer.

The invention relates to a composition for manufacturing a diaphragm of a lithium battery, which mainly solves the problem of failure in simultaneous obtaining of high porosity, high shrinkage rate and uniform pore forming in the prior art. The composition for manufacturing the diaphragm of the lithium battery adopts the technical scheme that the composition consists of polyethylene powder and paraffin oil, wherein the polyethylene powder comprises polyethylene particles, an antioxidant a and an antioxidant b; the mixing ratio of the polyethylene powder to the paraffin oil is 1:1 to 1:5.5; themasses of antioxidant a and antioxidant b respectively account for 0.1% to 1% of the mass of the polyethylene powder, so as to well solve the problem of failure in simultaneous obtaining of high porosity, high shrinkage rate and uniform pore forming in the prior art.

The invention discloses a preparation method of an air purification activated carbon adsorption material, which comprises the following steps of: well mixing sorghum flour and zinc chloride, adding the mixture into cold water, uniformly pulping, heating to 90-100 DEG C in a stirring state, adding sodium hydroxide, carrying out open heat preservation for 2-4 hours, stopping stirring, heating to 150-160 DEG C, carrying out heat preservation for 2-4 hours, solidifying, cooling, cutting the solidified material into parts with the same size, putting the material into a high-temperature furnace, calcining in a nitrogen atmosphere, putting the calcined material into 10% hydrochloric acid water, heating to 60 DEG C, slowly oscillating and washing, then rinsing the material with clear water until the material is neutral, and drying the material.