Do you understand the three dispersion methods of aluminum hydroxide?
The dispersion of aluminum hydroxide is actually particle dispersion. Particle dispersion refers to the process of separation and dispersion of powder particles in the liquid phase medium and uniform distribution in the whole liquid phase, which mainly includes three stages of wetting, deagglomeration and stabilization of dispersed particles.
aluminum hydroxideThe dispersion is actually particle dispersion. Particle dispersion refers to the process of separation and dispersion of powder particles in the liquid phase medium and uniform distribution in the whole liquid phase, which mainly includes three stages of wetting, deagglomeration and stabilization of dispersed particles. Wetting refers to the process in which the powder is added to the vortex formed in the mixed system, so that the air or other impurities adsorbed on the surface of the powder are replaced by liquid. Deagglomeration refers to the dispersion of larger particle size aggregates into smaller particles by mechanical or ultrasonic methods. Stabilization refers to ensuring that the powder particles remain uniformly dispersed in the liquid for a long period of time.
1, mechanical dispersion method, etc.
Mechanical dispersion is a method of fully dispersing nanoparticles in a medium by means of mechanical energy such as external shear force or impact force. Mechanical dispersion methods include grinding, ordinary ball milling, vibration ball milling, colloid milling, air milling, mechanical stirring, etc. This method is a commonly used method for dispersing ultrafine powder, but it is easy to introduce impurities and may change the physical and chemical properties of the powder.
2. Ultrasonic method
Ultrasonic dispersion is the need to deal with the particle suspension directly placed in the sound field, with the appropriate frequency and power of ultrasonic treatment, is a very high intensity of dispersion means. The mechanism of ultrasonic dispersion is cavitation, which can produce local high temperature and high pressure, and produce huge impact force and micro jet. Under the action of nano powder, the surface energy is weakened, which can effectively prevent the agglomeration of particles and make them fully dispersed.
3. Chemical dispersion method
Chemical dispersion is the choice of one or more suitable dispersants to improve the dispersion of the suspension, improve its stability and rheology. Commonly used dispersants are:
① Small molecular weight inorganic electrolytes or inorganic polymers, such as sodium silicate, sodium aluminate, potassium tripolyphosphate, etc. This kind of dispersant can be dissociated and charged, and adsorbed on the powder surface can increase the surface potential of the particles, increase the electrostatic repulsion, and improve the stability of the slurry. Its mechanism of action is electrostatic repulsion stabilization.
Surfactant, this kind of dispersant is composed of lipophilic group and hydrophilic group, is an amphiphilic molecule, including long chain fat, CTAB and so on. The main effect is steric hindrance effect, the hydrophilic group is adsorbed on the surface of the powder, and the hydrophobic chain extends to the solvent, which has a good effect on improving the rheology of the slurry.
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Zhongke Flame Retardant Organization Watches 20 Closing Ceremonies
On the morning of October 22, 2022, members of Zhongke Flame Retardant New Materials Co., Ltd. watched the closing ceremony of the 20th Congress under the leadership of General Manager Wang Ligui.
Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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