How to quickly and uniformly disperse fumed nano silica
ã€a brief introdction】
Nano silica is one of the most important high-tech ultra-fine inorganic new materials. Because of its small particle size, large specific surface area, strong surface adsorption, high surface energy, high chemical purity, good dispersion performance, thermal resistance, resistance It has unique properties in other aspects. With its excellent stability, reinforcement, thickening and thixotropy, it has unique characteristics in many disciplines and fields and has an irreplaceable role.
Nano silica is one of the most important high-tech ultra-fine inorganic new materials. Because of its small particle size, large specific surface area, strong surface adsorption, high surface energy, high chemical purity, good dispersion performance, thermal resistance, resistance It has unique properties in other aspects. With its excellent stability, reinforcement, thickening and thixotropy, it has unique characteristics in many disciplines and fields and has an irreplaceable role. Nano silica is commonly known as "ultrafine white carbon black", widely used in various industries as additives, catalyst carriers, petrochemicals, bleaching agents, matting agents, rubber reinforcing agents, plastic fillers, ink thickeners, metal softness Polishing agent, insulating and heat-insulating filler, advanced daily cosmetics filler and spray material, medicine, environmental protection and other fields.
The traditional dispersion methods of nano-silica mainly include:
Grinding and dispersing: using the difference between the roller and roller speed of the three-roller or multi-roller, the grinding material is put into the feeding groove between the feeding roller (rear roller) and the middle roller. The two rollers rotate inward at different speeds, and part of the grinding material enters The feed slot is subjected to a strong shearing action. Through the feed slot, the abrasive is divided into two parts, one part is attached to the feed roller and returned to the feed groove, and the other part is brought from the middle roller to the scraper between the middle roller and the front roller. The seam is again subjected to stronger shear forces. After the paint scraping joint, the grinding material is divided into two parts, one part is brought to the scraping place by the front roller, and falls into the paint scraping tray, and the other part is returned to the feeding groove, so that after several cycles, the purpose of dispersion can be achieved. However, the three-roller or multi-roller has low processing efficiency and high energy consumption, which can not meet the needs of large production.
Ball Milling Dispersion: Through the mutual collision between the grinding balls in the ball mill and between the grinding balls and the cylinder, the powder particles in contact with the steel balls are crushed or ground, and the mixture is highly turbulently mixed in the gaps of the balls Action is evenly dispersed.
Sanding dispersion: Sanding is the extension of ball milling. It's just that the grinding media is fine beads or sand. The sand mill can be continuously fed. When the premixed slurry of nano powder passes through the cylinder, the violent impact and shear given by the vigorously stirred sand particles in the cylinder make the nano oxides well dispersed in the coating. After the dispersed slurry leaves the sand grinding area and passes through the outlet screen, the overflow is discharged. The outlet screen can block the sand and return it to the drum. Dispersion by ball mill and sand mill can achieve better dispersion effect and material fineness, but ball mill and sand mill cannot avoid the disadvantages of low processing efficiency and high energy consumption.
Shanghai Yiken Silica High-speed Disperser:
The high speed and shear rate of the ultra-high-speed disperser are the most important for obtaining ultra-fine suspensions. According to the special requirements of the industry, Shanghai Yiken is in the CMD2000 series. The shear rate can exceed 14000 rpm and the rotor speed can reach 44m / s. In this speed range, the turbulence caused by shear force combined with a specially developed motor can make the particle size range as small as nanometers. The shear force is stronger and the particle distribution is narrower. Due to the extremely high energy density, no other auxiliary dispersion equipment is required.
CMD equipment compared with traditional equipment:
The high-efficiency and energy-saving traditional equipment requires 8 hours of dispersion processing. The CMD equipment is completed in about 1 hour. The ultra-fine dispersion effect is remarkable, and the energy consumption is greatly reduced. The rotation speed is less than 1500 revolutions per minute, only the macro dispersion processing is completed, and the ultra-fine dispersion ability is extremely limited; the rotation speed of the ERS equipment is between 10000-15000 revolutions per minute, the shear force generated by the ultra-high linear velocity, and the ultra-fine dispersion slurry In the powder.
How to quickly and uniformly disperse fumed nano silica
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