8results about How to "Control distribution" patented technology

This invention discloses a method for preparing in-situ grafted and dispersed nano-silica, relating to the field of nanomaterial preparation technology, comprising the following steps: Step ①, mixing sodium-free silica sol solution, water, and polyol in a high-pressure reactor; Step ②, gradually raising the reactor temperature from room temperature to 150-180℃, initially introducing acid anhydride gas or liquid at a certain flow rate, and maintaining temperature, constant pressure, and rotation speed until the pH value reaches 4.0-5.0±0.5, obtaining a primary mixture of hydrated nano-silica; Step ③, pumping an organosilicon coupling agent into the high-pressure reactor using a high-pressure metering pump, maintaining temperature and pressure, stirring the reaction for 30-90 minutes, then cooling, depressurizing, purging with nitrogen, and separating the reaction liquid to obtain grafted and dispersed nano-silica. This application aims to achieve readily available and inexpensive raw materials, reduce the difficulty of preparing nano-silica; solve the problems of dispersibility and compatibility with organic matter in nano-silica; simplify the procedure and improve preparation efficiency.

This invention relates to the field of preparation method technology and discloses a method for preparing a low-density nylon foam material. The method includes selecting nylon resin as the matrix material, wherein the nylon resin is a blend of PA6 and amorphous nylon PA610 in a specific ratio, wherein the mass ratio of PA6 to PA610 is 60:40 to 80:20, and the melt strength of the nylon resin is greater than or equal to 18 Pa·s; introducing a composite foaming agent, wherein the composite foaming agent is a combination of a chemical foaming agent and a physical foaming agent; and adding a nucleating agent, wherein the nucleating agent is nano-sized silica, nano-clay, talc, or a combination thereof, wherein the mass content of nano-silica is 0.5% to 2.0%. This invention can maintain stable dimensions and mechanical properties in humid environments and has a uniform and stable cell structure.

This invention relates to a novel one-step titanium alloy wire drawing process using rollers. This process replaces the traditional stretching method with multi-angle composite roller rolling, processing the wire in a circular-elliptical-circular pattern. By rationally allocating the elongation coefficient and the horizontal angle between the rollers for each pass, continuous one-step forming of the titanium alloy wire is achieved. This process is carried out at room temperature, requiring no auxiliary lubricants or intermediate heat treatment. Only one annealing after wire forming is needed to obtain a bright wire. The final finished wire exhibits excellent mechanical properties and high dimensional accuracy, significantly simplifying the titanium alloy wire manufacturing process, reducing production costs, and making it suitable for large-scale industrial production.

The application belongs to the technical field of sodium ion batteries, and discloses a preparation method of a double-site co-doped sodium ion battery positive electrode material. The method comprises the following steps: (1) according to the molar ratio of each metal element in the chemical formula of the target product, corresponding metal salts are weighed and dissolved in an ethanol solution to obtain a metal salt solution; oxalic acid is dissolved in an ethanol solution to obtain an oxalic acid solution; (2) under ultrasonic conditions, the metal salt solution is added dropwise into the oxalic acid solution, and stirring is continuously performed; after the metal salt solution is completely added dropwise, ultrasonic treatment is continuously performed; the suspension treated by ultrasonic treatment is placed in an oven for drying, and the powder obtained by drying is ground; (3) the ground powder is placed in a corundum box and then placed in a tube furnace for sintering; first, heating is performed to 500 DEG C for heat preservation; after cooling, the tablet is taken out, the pressed tablet is continuously placed in the tube furnace, heating is performed to 900 DEG C for heat preservation, after cooling, the tablet is taken out and ground, and the target product is obtained.

This application discloses a method for controlling the use of water-blocking agents in wells of bottom-water reservoirs. The method includes: obtaining the reservoir properties and fluid seepage mechanism of the bottom-water reservoir, wherein the reservoir properties include at least formation porosity; establishing a mathematical model for the dosage of water-blocking agents based on the reservoir properties and the fluid seepage mechanism, and determining the total dosage of water-blocking agents for the wells of the bottom-water reservoir based on the mathematical model; determining the dosage of multiple water-blocking agent slugs based on the total dosage of water-blocking agents, and obtaining the concentration of water-blocking agents in the multiple water-blocking agent slugs, wherein the sum of the dosages of water-blocking agents in the multiple water-blocking agent slugs is equal to the total dosage of water-blocking agents. The technical solution provided by this application can improve the water-blocking effect of wells in bottom-water reservoirs.

The present application relates to the technical field of enveloped vibrating screen, and particularly relates to an enveloped vibrating screen for titanium dioxide and a screening method thereof, which comprises a fixed base, supporting springs, a protective shell, a re-screening mechanism, a driving motor, a vibrating screen machine, a bottom outlet and a vibrating screen assembly; the supporting springs are installed at four corners of the fixed base, the protective shell is installed above the supporting springs, the re-screening mechanism is installed on the side of the protective shell, the re-screening mechanism is used for re-screening the material after the initial screening under the driving of the driving motor, the driving motor is installed above the re-screening mechanism, the vibrating screen machine is installed on both sides of the protective shell, the bottom outlet is arranged below the protective shell, and the vibrating screen assembly is installed inside the protective shell, the vibrating screen assembly is used for initially screening the mixed material and outputting small-particle material downwards.

The application discloses a manufacturing process for improving the solder mask bridge falling problem of a high-layer circuit board based on an AI server, relates to the field of PCB manufacturing technologies, and comprises a pretreatment process, a silk-screen printing process, a pre-baking process, an exposure process, a developing process and a high-temperature curing process. The pretreatment process adopts volcano ash plate grinding and super-rough cleaning. The silk-screen printing process adopts secondary printing of oil, and the first solder mask bridge position is blocked from oil. The exposure process reduces the gap between the solder mask bridge and the design PAD and etching PAD. The developing process maintains the pH value of developing liquid at a constant value by calculating the ink usage of a single PCB and adopting the drag tank method or the production green oil plate method, so that the problems of the prior art, such as the easy falling of the solder mask bridge and the high defect rate, are solved.

This invention belongs to the field of reactor technology and discloses an olefin polymerization reactor with a discharge port at the bottom. It includes: a stirring device, a gas distribution device, a feeding system, an internal cooling system for heat removal, and an external circulation system for heat removal located outside the reactor. The stirring device extends into the reactor. The feeding system consists of a feed pipe installed from the top to the bottom of the reactor. The gas distribution device consists of an inlet pipe installed from the top to the bottom of the reactor. The internal cooling system is located around the gas distribution device. The external circulation system is a jacket located outside the reactor. The feed pipe and the inlet pipe are detachable. This invention effectively solves the problem of material agglomeration and reduced reaction rate caused by the inability to quickly remove heat during the reaction due to exothermic reactions. It enhances heat exchange, improves reaction efficiency, stabilizes production, and significantly reduces maintenance costs.