A brief introduction of organic bentonite 

Organic bentonite has been applied to production, more than 30 years in our country. It is a kind of organic ammonium compound, montmorillonite/bentonite as raw material, the use of bentonite in the montmorillonite layer plate structure and swelling in water or organic solvent dispersion gel properties of clay, through ion exchange layer of organic coating agent technology.

Organic bentonite in all kinds of organic solvents, oils, can form gel, liquid resin has good thickening, thixotropy and suspension stability, high temperature stability, lubricity, film-forming property, water resistance and chemical stability, especially in the paint industry has important application value. In addition in printing ink, grease, metallurgy, oil drilling, and polymer industry also has a wide range of applications.

                                                                                        general

Organic bentonite has been applied to production, more than 30 years in our country. It is a kind of montmorillonite/organic ammonium compounds using bentonite as raw materials, use of bentonite in the montmorillonite layer plate structure and swelling in water or organic solvent dispersion gel properties of clay, through ion exchange layer of organic coating agent technology.

Organic bentonite in all kinds of organic solvents, oils, can form gel, liquid resin has good thickening, thixotropy and suspension stability, high temperature stability, lubricity, film-forming property, water resistance and chemical stability, especially in the paint industry has important application value. In addition in printing ink, grease, metallurgy, oil drilling, and polymer industry also has a wide range of applications.

                                                                            preparation principle   

The organic bentonite preparation principle is: montmorillonite is a kind of unique performance of aluminum silicate minerals, consists of two layers of Si - O tetrahedron sheet sandwiching a layer of AIO (OH) and surface layer consisting of a flaky mineral body. Montmorillonite layer structure unit of Si4 + can be Al3 + displacement, eight in the surface layer of Al3 + is often magnesium 2 +, Fe3 +, Zn2 + multivalent ions, such as replacement, so that the charge imbalance in the crystal lattice, produce residual negative charge, has the ability of adsorption of cation and anion exchange of sex, can have higher hydration, the C axis (layer superimposed direction) of oxygen and oxygen layer between the crystal layer force is lesser, can form good dissociation, interlayer is easy to be immersed in water or other polar molecules, causing the expansion of the C axis. This is other than the performance of the swelling clay does not have. Due to the performance of montmorillonite interlayer is full of interlayer water and exchangeability cation, they are causing the expansion of the montmorillonite. However, different metallogenic conditions of different regions of bentonite, its montmorillonite interlayer exchangeable cation and the kinds of exchange capacity (CEC) has a very big difference. Among them, the interlayer high cation (such as Ca2 +, magnesium 2 +) montmorillonite electric double layer hydration film thin, low expansion ratio; Low price cations (Na +, Li +, etc.) of hydration film thickness, high expansion ratio. General with montmorillonite interlayer cation adsorption of the main types, named as interlayer is given priority to with Ca2 + is called calcium base bentonite, give priority to with Na + is called sodium base bentonite, organic bentonite is given priority to with organic cation is called. Cation ion exchange properties of montmorillonite will available calcium base sodium montmorillonite or magnesium matrix into a base reacts with organic ammonium cationic organic bentonite. The preparation of organic bentonite was generally divided into: wet process and dry process (also known as a dry process), the most commonly used is wet process.

                                                                                Usage and dosage

Recommended method is: first make organic bentonite gel (or organic bentonite gel), reoccupy dilute organic bentonite gel in advance into the appropriate concentration is applied to products, organic bentonite gel preparation process shown in the following table (using high-speed dispersion machine) :

First in solvent and start mixing, mixed with organic bentonite for 5 minutes, mixed with polar activator (polar additives) to continue for 10 minutes. Organic bentonite dosage can increase and decrease, for the sake of easy to operate, with 10% as the highest amount. Through the experiments, the best polar additives with 95% methanol, 95% ethanol and propylene carbonate, the recommended dosage is as follows:

Methanol/water (95/5), 30-35% of the amount of organic bentonite

Ethanol/water (95/5), 30-40% of the amount of organic bentonite

The amount of propylene carbonate, organic bentonite 40-50%

In order to get the best efficiency of gel, methanol and ethanol have to contain 5% of the water, using methanol or ethanol containing water, viscosity rise soon, and the use of anhydrous methanol or ethanol, gel effect is not ideal.

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