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Coatings

HY Series Organic Bentonite Use Method

HY series organic bentonite is made by excellent bentonite with the processing of highly purified, modified and ion exchange into organic covering agent, it is a sheet structure product, if you want the organic bentonite to play a better performance, you need to separate its sheet-structure as much as possible. This process usually needs to be provided with mechanical energy, chemical energy and heat energy.

Use Method:

Dry powder method:

Dry powder method is that add the dry powder directly into the system during the production process, it doesn't need the polar activator, such as HY-2, HY-S2, HY-S3, HY-S34.

Pre gel method:

For poor wettability resin systems (such as epoxy, polyester, short oil alkyd resin etc. )it is better to use HY series organic bentonite by pre gel.

(1) composed of pre gel: solvent 87%, organic bentonite 8-10%, polar activator 3-4%.

(2) preparation of pre gel: solvent and organic bentonite (mixed 10min, fully wettability), then add the polar activator (stirring for 5min, full expansion).

Other information:

The dispersion speed

No matter you use any one method, bentonite products must be thoroughly dispersed to be a gel, so it can show its properties as thixotropy, anti settling and thickening effect, this kind of dispersion need extra high shear force, for example, to use high speed dispersion machine, three roller mill, colloid mill, sand grinding or milling. If the shear force and activation energy is enough, it is easy to obtain gel. The organic bentonite efficiency increased with the increase of dispersion speed.

Dispersion temperature

Increasing the temperature can also improve the gel property. The gel property with high temperature solvent is better than the low temperature (0 °C -5 °C ) solvent when the other conditions keep the same. But the dispersion temperature can not exceed the boiling point of activation solvent.

Activating agent

The polar additive can help the sheet-layer structure bentonite easily form a layer-sheet structure, thus formed a thixotropic gel, polar additives such as ethanol, methanol, acetone, propylene carbonate, the add amount of polar additives is generally 30%-50% of the organic bentonite.

Moisture

Organic bentonite must have enough moisture to develop into a network structure pre gel, the water molecules forming a bridge for the network structure, so the organic bentonite should not be too dry, the general moisture content should be around 3.5%, polar additives should not use anhydrous, the suitable content of the polar additives is appropriate 95% (the moisture is 5%).