Preparation of a concentrated organophyllosilicate and nanocomposite composition
View Patent ↗The present invention provide methods for producing a low moisture organophyllosilicate composition using monomers, oligomers, or polymers to displace water associated with the organophyllosilicates in an aqueous organophyllosilicate slurry or filter cake. The invention additionally provides methods for producing organophyllosilicate nanocomposites from the concentrated organophyllosilicate compositions by dispersing the compositions in a polymer matrix.
1. A method for producing a concentrated organophyllosilicate composition comprising:
(a) mixing an aqueous slurry or filter cake comprising an organophyllosilicate having water molecules associated therewith with an oligomer capable of displacing the water molecules to separate at least a portion of the water from the organophyllosilicate, wherein the oligomer is selected from the group consisting of paraffin waxes, microcrystalline montan waxes, vegetable waxes, Fisher-Tropsch waxes, polypropylene waxes, polyethylene waxes, polyethylene glycol waxes, and combinations thereof, and the oligomer has a melting point of from about 10° C. to about 160° C.; and
(b) removing at least a portion of the displaced water as a liquid from the slurry or filter cake to form a concentrated organophyllosilicate composition.
2. The method of claim 1 , wherein the oligomer has a molecular weight of no more than 20,000.
3. The method of claim 1 , wherein the oligomer is selected from the group consisting of polypropylene waxes, polyethylene waxes, polyethylene glycol waxes, and combinations thereof.
4. The method of claim 1 , wherein the weight ratio of the organophyllosilicate to the oligomer is from about 90:10 to about 25:75.
5. The method of claim 1 , wherein the weight ratio of the organophyllosilicate to the oligomer is from about 75:25 to about 40:60.
6. The method of claim 1 , wherein the concentrated organophyllosilicate composition comprises no more than about 10 weight percent water.
7. The method of claim 1 , wherein the concentrated organophyllosilicate composition is produced without film drying or spray drying.
8. The method of claim 1 , further comprising dispersing the concentrated organophyllosilicate composition in a polymer to form an organophyllosilicate nanocomposite.
9. The method of claim 1 , further comprising crosslinking the oligomer in the presence of the concentrated organophyllosilicate composition to form an organophyllosilicate nanocomposite.
10. The method of claim 9 further comprising diluting the concentrated organophyllosilicate composition with additional oligomer, crosslinkable polymers, or mixtures thereof prior to crosslinking.
11. The method of claim 1 , further comprising heating the concentrated organophyllosilicate composition to a temperature sufficient to evaporate off at least a portion of the displaced water.