3 effects of titanium dioxide nanoparticles

2021-11-16   Pageview:345

Nano titanium dioxide has special physical and chemical properties that traditional materials do not have, its high chemical stability, small particle size, large specific surface area, high surface energy, and its unique three effects: surface effect, small size effect and macroscopic quantum tunneling effect.

 

 

 

 

 

 

 

 

 

 

 

 

 

Associative alkali swelling thickener
Composition, structure and properties of HAS E Associative HAS E is a hydrophobically modified polyacrylate alkali swelling emulsion. Its skeleton is composed of about 49% (mole fraction) of methacrylic acid, about 50% (mole fraction) of ethyl acrylate and about 1% (mole fraction) of hydrophobically modified macromolecules []. At the same time, there is a small amount of cross-linking agent, which keeps the polymer together when it neutralizes and swells. Methacrylic acid was chosen because of its ability to enter micelles at low pH, while ethyl acrylate was used because of its low glass transition temperature and high hydrophilicity. Among them, ethylene acrylic acid copolymer emulsion the hydrophobic group R has a great influence on the thickening effect, and R can be nonylbenzene.
The thickening mechanism is based on the thickening of ASE, plus the association, that is, the hydrophobic chain of the enhancer polymer and the hydrophobic part of the latex particles, surfactants, pigment particles, etc. associate to form a three-dimensional network structure, and there are also micelles. Function to increase the viscosity of the latex paint system.

Its characteristic is high thickening efficiency, because of its low viscosity, it is easy to disperse in paint. Most varieties have a certain degree of thixotropy, and there are also products with high thixotropy that can be selected for mixing. At the same time, they also have moderate leveling properties. The paint roller has good splash resistance and good antibacterial properties. It has no adverse effect on the gloss of the paint film. cheap price. But it is sensitive to the pH value, that is, the viscosity changes with the pH value.

Because it contains a large amount of methacrylic acid, HAS E is an electrolyte. When the salt content in the solution increases, the viscosity of HAS E decreases [2].
In 1% (mass fraction) HAS E aqueous solution, as the hydrophobic group increases, the viscosity of Ci z~Cao increases [2].
HAS E thickeners include Nopeo’s SN 636, Rohm & Haas’ TT-935, etc. This type of thickener also includes polyurethane-containing and non-polyurethane-containing thickeners.
Elements company has developed a VOC and A PEO-free HAS E thickener, such as Rheol ate 125.

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