magnetic separator factory
PTMS magnetic separation
what is magnetic separation in science？
There are many siloxane groups, silane groups and aluminum alcohol groups on the surface of clay. These reactive groups can chemically react with various organic substances. Different types of organic functional groups can be introduced into the structure of clay as needed, causing surface physics of clay minerals. Changes in chemical properties.
In the liquid phase environment, the surface hydroxyl groups of the clay minerals react with the dissolved substances. There are two methods for grafting organic macromolecules with clay minerals: one is to directly graft the organic macromolecules to the surface of the mineral substrate by heterogeneous etherification or heterogeneous esterification; the other is to act by ultraviolet light. By means of other means, a free radical is generated on the surface of the mineral, and the radical initiates an olefin monomer (styrene, acrylic acid, propylene, etc.) to form an olefin radical, thereby continuing the radical polymerization to form a polymer chain on the surface of the mineral.
The ultraviolet light grafting method can graft acrylic acid onto the surface of the attapulgite to form a polyacrylic acid brush-modified attapulgite material. The convex and convex bar soil is rod-shaped, has a diameter of about 50 nm, and the surface is relatively smooth. After grafting with acrylic acid, the sample diameter is increased to about 100 nm, and the surface is rough. The grafted sample has an excellent adsorption rate for Ce3+ adsorption and an extremely high adsorption amount.
Due to the wide variety of organic compounds and the complex interactions with clay minerals, the grafting of clay minerals is rich in content and has broad prospects for use. At present, grafted organoclay minerals have been widely used in petrochemical, rubber plastic, paint and coating industries.
By using the layered structure unique to clay, inorganic ion groups and organic molecules can be inserted between the clay silicate layers, so that the physicochemical properties of the clay minerals are significantly changed, so that the clay minerals are in polymer materials, solid electrolytes, high-performance ceramics. Such fields are widely used.
The application of intercalation technology is illustrated by taking kaolin intercalation as an example. Kaolin is a octahedron 1:1 type layered silicate structure. Each layer is composed of a layer of siloxane tetrahedron and an aluminoxy octahedron connected by a common apex oxygen atom. The layers do not contain exchangeable ions. They are tightly connected by hydrogen bonds.
The viscosity of the native kaolin is generally between 50-65%, but the kaolin clay concentration required for papermaking coatings is typically between 66-68%. Polar molecules (such as dimethyl sulfoxide, urea, urea, etc.) are inserted between the kaolin layers, and these polar molecules form hydrogen bonds with the aluminoxy tetrahedron and the octahedron, thereby increasing the spacing of the kaolin layer and the interlayer spacing. The force is weakened, thereby increasing the viscosity of the kaolin.
The urea intercalation technique can increase the viscosity of kaolin from 68% to over 74%, thereby satisfying the application of kaolin in satisfying the paper coating process.
The intercalation of kaolin makes the composite not only have the characteristics of dispersion, rheology, adsorption and the like of the clay mineral itself, but also has the reactivity of the organic functional group, so the intercalated organic kaolin has a wider application field. At present, the research on intercalated kaolin is gradually deepened, including research on preparation, structure and performance characterization.
