75results about How to "Adjust aperture" patented technology

A method for sintering an anode block of a tantalum capacitor is characterized by including: placing tantalum anode block pressed by tantalum powder mixed with adhesive in a drying furnace filled with degreased solvent, performing airtight low-temperature solvent catalysis wet dewaxing, drying in vacuum and then performing vacuum sintering. The tantalum anode block obtained through the method maintains high specific surface area and high porosity, so that the tantalum anode block is high in specific capacity and low in leakage current, carbon content and oxygen content of the anode block can respectively drop to 0.005%-0.010% and 0.18% to 0.65%.

The invention discloses an adjustable plug-in slurry injector, and belongs to a slurry injector in the filed of distorted concrete slurry injection construction. The adjustable plug-in slurry injector comprises a slurry injection pipe, a conical head and a connector, wherein a slurry inlet of the slurry injection pipe is connected with the connector, a slurry outlet of the slurry injection pipe is connected with the conical head, slurry injection holes are formed at the lower portion of the slurry injection pipe and are arranged into a plurality of layers, the slurry injection holes of each layer are distributed evenly, and the layers are arranged in a staggered mode. The adjustable plug-in slurry injector is characterized in that the slurry injection holes are threaded holes, slurry outlet heads of different inner diameters are arranged on the slurry injection holes, or plugs are arranged on the slurry injection holes. The adjustable plug-in slurry injector has the advantages that the slurry injection holes are the threaded holes, the slurry outlet heads of different inner diameters are arranged on the slurry injection holes, and the hole diameters of the slurry injection holes can be adjusted as needed. The plugs are arranged on the slurry injection holes, the height and the quantity of the slurry injection holes can be adjusted as needed, the hole diameters of the slurry injection holes can be adjusted freely, so that distorted concrete slurry is injected conveniently and evenly, and construction quality is guaranteed.

Described is a method of preparing foams, wherein a suspension comprising an aqueous liquid, particles and at least one surfactant is provided, wherein the at least one surfactant at least partially hydrophobizes a surface of the particles, and wherein the suspension comprising the particles having the at least partially hydrophobized surface is foamed. The at least one surfactant is selected fromsurfactants having a backbone chain comprising at least nine carbon atoms, the at least one surfactant preferably being an amphiphilic molecule consisting of a tail coupled to a head group, wherein the tail comprises the backbone chain comprising at least nine carbon atoms.

The invention relates to a preparation method of foam concrete with adjustable pore characteristics, and belongs to the technical field of concrete. The foam concrete comprises an expansion and shrinkage material, cement and mixing water. The preparation method comprises the following steps: designing a mixing ratio, calculating and weighing the mass of each required material, carrying out pre-water-absorption treatment on the dry expansion and shrinkage material, stirring cement slurry, and uniformly stirring the expansion and shrinkage material subjected to the pre-water-absorption treatmentand the cement slurry to obtain the foam concrete. According to the invention, the problems of defoaming, pore structure, shrinkage cracking and foaming agent in the existing foam concrete preparation method can be effectively solved; during blending ratio design, the dry density, the designed pore diameter and the designed strength are taken as design indexes, the pore characteristics can be adjusted, the defect that the strength grade of the foam concrete cannot be controlled due to the fact that only the dry density is taken as the design index in an existing foam concrete mix proportion design method is overcome, and the produced foam concrete can meet the requirements for the dry density and the strength at the same time.

The invention discloses a three-dimensional porous micro-carrier scaffold and a method for preparing the scaffold by the aid of ionic additives. The method comprises the following steps of: 1) mixinga biological material with a buffer solution, adding an ionic pore-forming additive, and mixing to obtain a completely co-soluble premix solution; 2) mixing an organic solvent with a nonionic surfactant to obtain an organic phase solution, and pre-cooling the organic phase solution; 3) preparing an emulsion: mixing the premixed solution with a curing agent under a refrigeration condition to obtaina water phase solution; adding the water phase solution into the organic phase solution for emulsification to obtain W / O type emulsion droplets, and then carrying out a low-temperature light-shielding emulsification reaction on the W / O type emulsion droplets to obtain an emulsion; 4) sequentially removing liquid components from the emulsion, filtering out an organic phase by using a filter screen, and screening out liquid microspheres with particle sizes within a required particle size range, and 5) wetting the liquid microspheres with water, then freezing, and drying after freezing to obtaina three-dimensional porous micro-carrier. By the preparation method, the pore diameter of the three-dimensional porous micro-carrier can be adjusted.

The invention discloses a membrane element which comprises a filtering membrane and a membrane protective device, the filter membrane is provided with a raw water flow channel and a pure water flow channel which are mutually separated, the outlet of the raw water flow channel is located at at least one side edge of the filter membrane, the membrane protective device sleeves outside the filter membrane, the membrane protective device is provided with at least one opening communicated with the outlet of the raw water flow channel, and a fluid flowed from the outlet of the raw water flow channel is led out of the membrane protective device by the membrane protective device via the opening. The membrane element can reduce the deposition of pollutants at the outlet of the raw water flow channel of the filter membrane, and the service life of the membrane element can be effectively prolonged.

The invention relates to a graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material and a preparation method thereof. Graphene oxide is prepared according to a Hummers method, graphene oxide colloidal suspension with a certain concentration is prepared, an Fe2+ solution is added, after the pH value of an ammonia-water solution is adjusted, the ammonia-water solution is injected into a reactor, and reaction is carried out under the high-temperature, high-pressure and closed condition. Fe2+ solubility, pH value, reaction time and reaction temperature are adjusted to adjust the foam holes and the wave-absorbing property of a composite material. Graphene in the graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material has a foam multi-hole structure, Fe3O4 magnetic particles are firmly anchored and loaded in the graphene foam structure, and the grain size of Fe3O4 is 150-300 nm. The graphene foam loaded nano Fe3O4 magnetic particle composite wave-absorbing material is high in absorbing strength, wide in wave-absorbing frequency bandwidth, light in weight and good in mechanical property, and is a composite material with excellent performance. Multiple aspects of use requirements can be met.

The invention provides a composite chromatography filtering membrane material based on nanofibers and polymer microspheres and a preparation method thereof. Mixing the PVA-co-PE nanofibers and the sulfonated polymer microspheres according to a preset mass ratio to prepare a suspension; then preparing the suspension into a fiber membrane material, and distributing the sulfonated polymer microspheres on the fiber surface and among fiber pores of the fiber membrane material to form a multi-level filtering pore structure, so as to synchronously improve the flux, the rejection rate, the filtering stability and the cation adsorption performance of the fiber membrane material. The nanofiber and the sulfonated polymer microspheres with higher content are compounded to prepare the membrane material, and the optimization of the membrane material structure is realized, so that the permeation flux is improved; meanwhile, the sulfonated polymer microspheres have excellent cation adsorbability, swelling property and good toughness, the strength of the membrane material is improved, and the membrane material can be applied to filtration and chromatography under high pressure, so that the filtration-chromatography efficiency and the filtration-chromatography stability are improved.