HY Series Organic Bentonite Use Method
HY series organic bentonite is made by excelent bentonite with the processing of highly purified, modied and ion exchange into organic covering agent, it is a sheet stucure prouct, if you want the organc bentonite to play a better perfomance, you need to separate its shee-structure as much as possible. This proess usually needs to be provided with mechanical energy, chemical energy and heat energy.
Dry powder method:
Dry powder method is that add the dry powder directly into the system during the prodution process, it doesn't need the polar activator, such as HY-2, HY-S2, HY-S34,HY-120,HY-170.
For por wetability resin systems (such as epoxy polester, short oil alkyd resin etc.) it is better to use HY seies 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 (mixe 10min lully etabilty then add the polar activator (stirring for 5min,full expansion).
The dispersion speed
No matter you use any one method, bentonite products must be throughly dispersed to be a gel, so it can show its properties as thixotropy, anti setling and thickng 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 enery is enough, it is easy to obtain gel. The organc bentonite eficiency increased with the increase of dispersion speed.
Increasing the temperature can also improve the gel property. The gel property with high temperature solvent is better than the low temperature (0 ℃ -5 ℃ ) solvent when the other conditions keep the same. But the dispersion temperature can not exceed the bolling point of activation solvent.
The polar addtive can help the sheet-laver structure bentonite easiy form a layer-sheet stuture, thus formed a thixotropic gel, polar addtives such as ethanol, methanol, acetone, propylene carbonate, the add amount of polar additives is generally 30%-50% of the organic bentonite.
Oroanic 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 oranic bentonite should not be too dy, the eneral moisture content should be around 3.5%, polar aditives should not use anhvdrous, the suitable content of the olar aditivs is appropriate 95% (the moisture is 5%).