Titanium dioxide ultrasonic dispersion mixer

1. Product Introduction:

TiO2 is a commonly used white pigment, widely used in coatings, plastics, rubber, paper, ceramics, cosmetics, and textile industries. With people's increasing concern for the environment, water-based environmentally friendly coatings are highly favored, and TiO2, as a high-quality white pigment, how to better apply it to water-based coatings is currently a research topic. Water dispersibility is an important performance indicator of TiO2 in water-based coatings, and its quality directly affects the coating's coverage and other properties. For the improvement of TiO2 water dispersibility, this article first analyzes the mechanism of water dispersibility, and then confirms it through modification experiments.

Theoretical basis for 2 modifications

2.1 Surface Characteristics of TiO2

2.1.1 Agglomeration phenomenon in single-phase

The primary particles obtained from TiO2 calcination are very small, with high specific surface energy, extremely unstable, and will quickly aggregate at high temperatures, forming larger metastable particles. For a certain amount of TiO2, the smaller the particles, the stronger the attraction between primary particles, and the particles are more likely to aggregate.

At present, the average particle size of TiO2 measured by instruments is mostly the size of secondary particles (generally 0.2-0.4um), and the surface energy is still relatively high, which can be easily reduced by agglomeration to achieve a quasi stable state. Therefore, the tendency of TiO2 to agglomerate in single-phase is a prerequisite for discussing its water dispersibility.

2.1.2 High dispersibility in two phases

TiO2 exhibits high dispersibility in aqueous dispersions. The reason is that: ① There are many hydroxyl groups on the surface of TiO2, which can adsorb polar particles, causing the solid surface to carry the same charge and disperse due to the repulsion of the same charge; ② The specific surface energy of particles is high, and surface shrinkage reduces surface energy, stabilizing the dispersion system. It is precisely the high dispersibility of TiO2 in water that enables it to be widely used in water-based coatings.

Dispersion process of TiO2 in aqueous dispersion

2.2.1 Adsorption

Numerous studies have shown that there are many polar hydroxyl groups on the surface of TiO2. If no dispersant is added in water, TiO2 will adsorb a large number of polar groups when dispersed in water; If a certain concentration of polymer dispersant is added, the polymer dispersant adsorbs on the surface of TiO2 particles, increasing the thickness of the adsorption layer and changing the surface properties.

2.2.2 Double layer theory

By detecting the Zeta potential of TiO2 in water, it was found that the Zeta potential of anatase TiO2 is about 36mV at a pH of around 6.8, indicating that the TiO2 surface carries charges and has strong electronegativity. The explanation of the dispersion process of TiO2 in water based on the double layer theory is factual and has certain scientific basis.

In fact, the process of TiO2 dispersion in water is the formation of a double layer. When TiO2 comes into contact with the water surface, it is instantly immersed and wetted, and a layer of opposite charges is adsorbed on its surface, forming a double layer. This double layer can be seen as particles surrounded by the same charge on all sides. When Brownian motion brings two particles closer, charges of the same nature generate repulsion between them. When this repulsion is greater than van der Waals attraction, the particles separate and the system is in a dispersed stable state.

3 Modification tests

In order to improve the water dispersibility of TiO2, surface treatment is needed. The commonly used method is stabilization treatment, which involves adding other elements to the crystal structure or modifying the surface of particles, all of which help to change their physical and chemical properties.

3.1 Purpose of Modification

Introducing new functional groups that can interact with organic compounds, improving interfacial adhesion, and altering surface hydrophilicity/hydrophobicity. The modified product should have the lowest possible bulk density and the highest possible hydrophobicity.

Titanium dioxide ultrasonic dispersion mixer - Shanghai Huashuo Intelligent

The ultrasonic homogenizer utilizes its cavitation effect and its accompanying mechanical, thermal, chemical, biological, and other effects to achieve material dispersion and mixing.

Titanium dioxide ultrasonic dispersion mixer - Shanghai Huashuo Intelligent

Applicable industries:

1. Biological industry: such as essential oil extraction, natural pigment extraction, polysaccharide extraction, flavonoid extraction, alkaloid extraction, polyphenol extraction, organic acid extraction, oil extraction, etc,

2. Laboratory applications: cell pulverization, product pulverization, material dispersion (suspension preparation) and coagulation,

3. Chemical industry: ultrasonic emulsification and homogenization, ultrasonic gel liquefaction, resin defoaming

4. Ultrasonic biodiesel production technology significantly accelerates and enhances various chemical reactions in various chemical production processes.

5. Water treatment industry: degradation of polluted water quality, such as killing microorganisms.

6. Food and cosmetics industry: refinement of alcoholic beverages, refinement of cosmetic particles, and preparation of nanoparticles

7. Graphene industry: exfoliation of graphene, dispersion of graphene, and preparation of graphene nanoparticles.

Ultrasonic mixer parameters:

Performance characteristics:

1. Working mode: continuous or intermittent

2. Equipment installation: The flange is fixed to the customer's existing container, which is simple and convenient

3. Amplitude range: 10-70 μ m

4. Temperature range: within 200 ℃

5. Equipped with a CNC chassis, real-time tracking of frequency ensures stable operation of the equipment.

6. The length and tool head shape can be customized according to customer needs to meet their requirements.