The Application Of Coated Kaolin

2021-03-18

Summary´╝ÜKaolin is a natural clay mineral with a typical 1:1 layered silicate crystal structure, natural layered structure, strong adsorption and good biocompatibility,

Kaolin is a natural clay mineral with a typical 1:1 layered silicate crystal structure, natural layered structure, strong adsorption and good biocompatibility, making kaolin in energy saving, environmental protection, biological Strategic emerging industries such as medicine, new energy, and new materials have shown unique advantages.

1. Heavy metal wastewater treatment

The natural two-dimensional layered structure makes kaolin have a larger specific surface area and better adsorption performance. After modification, it can be used as a high-quality adsorbent to solve environmental pollution problems such as organic pollutants, heavy metals and suspended solids in water. Profound meaning.

2. Heavy metal air pollution treatment

The emission of elemental mercury in the atmosphere is the most important form of mercury pollution, and kaolin is the best clay mineral for removing mercury from the atmosphere.

3. Organic sewage treatment

The surface physicochemical properties, specific surface area and adsorptivity of the chemically modified kaolin have been changed, so that the modified kaolin has greatly enhanced the adsorption capacity of organic pollutants.

4. Building phase change heat storage materials

Using dimethyl sulfoxide (DMSO) as the intercalant, the coal-based kaolin was intercalated and modified by the melt intercalation method, and the intercalated modified kaolin was used as the matrix, and the phase change material laurel was inserted between the layers. Alcohol (LAL) and lauric acid (LA), the resulting binary organic/coal kaolin composite phase change energy storage material, can be used to control indoor temperature changes and is suitable for heating, ventilation and air conditioning of building envelopes.

5. Solar energy storage materials

Compared with the same type of phase change heat storage materials, the kaolin/sodium stearate phase change heat storage materials prepared by using kaolin and sodium stearate as raw materials have their latent heat of melting and condensation as high as 109.25 and 109.01 J/g, respectively , It is more suitable for the heat storage system of solar thermal power station.

6. New materials

Abundant reserves, low price, and high content of aluminum and silicon make kaolin a good raw material for preparing molecular sieves. Molecular sieves have good selective adsorption, ion exchange and hydrophilic properties, etc., and are widely used in chemical, medical and environmental protection fields.

7. Hemostatic materials

Layered silicate (synthetic hydrotalcite, series montmorillonite, kaolinite) clay minerals do not release heat during the process of hemostasis in vitro, and have a wide range of coagulation properties. They are also inexpensive, stable and non-toxic, and can be used as a new type of coagulation. The agent replaces the traditional commercial zeolite-based hemostatic agent.

8. Drug Carrier

Kaolin has good biocompatibility. Through intercalation to expand the interlayer spacing, it can provide new active sites for drug molecules, promote the entry of drugs into the interlayer, and realize the loading and release of drugs.

9. Antibacterial materials

Compared with montmorillonite, kaolinite has a weaker ion exchange capacity, so the antibacterial agent is easier to release and has a better sterilization effect. Therefore, kaolin can be well used for sterilization, and it is used as an antibacterial agent in organic clay. During the development process, the amount of surfactant fixed on the clay must exceed the CMC value.

10. Tissue Engineering

Using kaolin as the binder and using the modified polyurethane foam (PU) template method, a three-dimensional MBG scaffold with excellent mechanical strength, mineralization ability and good cell response (ideal biomaterial for bone tissue applications) can be prepared. After adding kaolin, the pH environment of the MBG-10K scaffold is more stable and ideal, and the protein adsorption capacity is enhanced.

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