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Organic bentonite

Organic bentonite has been produced and applied in China for more than thirty years. It is a montmorillonite / organic ammonium composite. It uses bentonite as a raw material, and uses the lamellar structure of montmorillonite in bentonite and its characteristics of swelling and dispersing into colloidal clay particles in water or organic solvents. Made of technical intercalation organic coatings.
Organic bentonite can form gels in various organic solvents, oils, and liquid resins. It has good thickening, thixotropic, suspension stability, high temperature stability, lubricity, film formation, water resistance and chemical stability. , Especially in the coating industry has important application value. It is also widely used in ink, grease, metallurgy, petroleum drilling and polymers industries.
general
Organic bentonite has been produced and applied in China for more than thirty years. It is a montmorillonite / organic ammonium compound based on bentonite. It uses the lamella structure of montmorillonite in bentonite and its ability to swell and disperse into colloidal clay particles in water or organic solvents. Through ion exchange technology It is made by intercalating organic covering agent.
Organic bentonite can form gels in various organic solvents, oils, and liquid resins. It has good thickening, thixotropic, suspension stability, high temperature stability, lubricity, film formation, water resistance and chemical stability. , Especially in the coating industry has important application value. It is also widely used in ink, grease, metallurgy, petroleum drilling and polymers industries.
Preparation principle
The principle of preparation of organic bentonite is that montmorillonite is a kind of aluminosilicate mineral with unique properties. It consists of two layers of Si-O tetrahedron sheet with a layer of AIO (OH) octahedron sheet. The Si4 + in the montmorillonite structural unit layer can be replaced by Al3 +, and the Al3 + in the octahedral layer is often replaced by polyvalent ions such as Mg2 +, Fe3 +, Zn2 +, etc., so that the charge in the crystal lattice is unbalanced and the residual negative charge is generated, which has The ability to adsorb cations and exchangeable anions has high hydration energy, and the interaction between the oxygen layer and the oxygen layer in the crystal layer of the C axis (layer stacking direction) is small, which can form a good dissociation surface. Water layers or other polar molecules are easily immersed between the layers, causing expansion in the C-axis direction. This is a property not found in other non-swellable clays. Because of this property, the interlayer of montmorillonite is filled with interlayer water and exchangeable cations, which are the driving force for the expansion of montmorillonite. However, for bentonite with different mineralization conditions and origin, the types of exchangeable cations and exchange capacity (CEC) of montmorillonite are very different. Among them, the interlayer high-valent cations (Ca2 +, Mg2 +, etc.) montmorillonite electric double layer hydration film is thin, and the expansion factor is low; low-priced cations (Na +, Li +, etc.) hydration film is thick and the expansion factor is high. It is generally named after the main type of cations adsorbed between montmorillonite layers. If Ca2 + is the main layer, it is called calcium-based bentonite, Na + is the main sodium-based bentonite, and organic cations are called organic bentonite. . The cation ion exchange property of montmorillonite can be used to convert calcium-based montmorillonite or magnesium group into sodium group and then react it with organic ammonium cation to form organic bentonite. The preparation process of organic bentonite is generally divided into: wet process and dry process (also called semi-dry process), the most commonly used is the wet process.
Usage and dosage
The recommended use method is: firstly make the organic bentonite pregel (or organic bentonite gel), and then dilute the organic bentonite pregel to a suitable concentration and apply it to the product. The preparation process of the organic bentonite gel is shown in the following table ( Using high-speed disperser):
The main parameters
Reports: operating: Feeding amount (mass percentage)
Solvent (solvent oil) mixing 85-88
Organic bentonite Mix for 5 minutes 8-10
3. Polar activator Mix for 10 minutes 3-5
Put in the solvent first, start mixing, add organic bentonite and mix for 5 minutes, add polar activator (polar additive) and continue mixing for 10 minutes. The amount of organic bentonite can be increased or decreased. For the convenience of operation, the maximum amount is 10%. Through testing, the best polar additives are 95% methanol, 95% ethanol and propylene carbonate. The recommended dosages are as follows:
Methanol / water (95/5), 30-35% of organic bentonite
Ethanol / water (95/5), 30-40% of organic bentonite
Propylene carbonate, 40-50% of the amount of organic bentonite
In order to obtain the best gel efficiency, both methanol and ethanol need to contain 5% water. When using methanol or ethanol containing water, the viscosity rises quickly, while using anhydrous methanol or ethanol, the gel effect is not ideal.
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Zhejiang Public Network Security No. 33052302000300


Zhejiang ICP No. 12000628-1
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