Solvent-based rheology additives
Solvent-based rheology additives are prepared by adding organic surfactants to natural montmorillonite minerals after activation treatment. Due to the hydrophobic and lipophilic nature of organic montmorillonite, it has excellent swelling, high dispersion and thixotropy in organic solvents. Therefore, it is conducive to the formation and stability of organic suspension, and has a good thickening and viscous effect, and is expected to be widely used as an anti-settling agent, suspension agent and thickener in paints, coatings, cosmetics, petroleum industry, etc.
Principle of Preparation：
The cations between the montmorillonite layers mainly exist in the form of electrostatic physical adsorption, and this adsorption is reversible. Under certain conditions, the adsorbed cations between layers can be exchanged by other cations, and the organic modification of montmorillonite is the process of cation exchange between organic cations and montmorillonite layers. In the process of organic modification, the basic driving force of organic cations entering the montmorillonite interlayer domain has two aspects: one is electrostatic attraction, and organic cations are adsorbed at the montmorillonite level by electrostatic attraction; the second is the concentration difference, and the organic cation can only ensure the full exchange of inorganic cations between layers after reaching a certain concentration in the medium.
Product performance indicators：
Off-white or light off-white powder
Particle size（mesh 200）%
TOP-T510 is an organically modified montmorillonite clay mineral suitable for low to medium polar organic solvent coating systems. Such as aliphatic 200# solvent oil, petroleum ether, aromatic system xylene, naphtha, etc.
TOP-T520 is an organically modified montmorillonite clay mineral suitable for medium to high polarity organic solvent coating systems and synthetic binder systems. Such as in xylene-esters, xylene-ketone solvent systems.
TOP-T550 is an ultra-easily dispersible organically modified montmorillonite clay mineral suitable for low to medium polar organic solvent coating systems. It can be used without adding activators for aliphatic 200# solvent oil, petroleum ether, xylene, naphtha, etc. of aromatic systems.
TOP-T560 is an ultra-easy scattering organically modified montmorillonite clay mineral suitable for medium to high polarity organic solvent coating systems and synthetic binder systems. It can be used in xylene-ester and xylene-ketone solvent systems without adding activators.
Industrial coatings, thick paste coatings, coil coatings, interior and exterior wall coatings, anti-corrosion coatings, asphalt coatings, decorative coatings, printing and dyeing inks, primers, epoxy coatings.
TOP-T510 and TOP-T520 have excellent thixotropic performance to increase anti-sagging and enhance the anti-settling effect of emulsion.
TOP-T550 and TOP-T560 can be dispersed under low shear force without adding activator. Provide good anti-sagging and anti-settling effect.
Method of Application:
Add as a 5-12 wt% pre-gel and then during the grinding process. It can also be directly connected to the resin or solvent, told to disperse for 10min, and then add the pigment filler for 10min after adding the active agent to disperse at high speed. TOP-T550 and TOP-T560 can be dispersed under low shear force, without adding activators or directly into the coating system.
Typically it is 0.3-2% of the total formulation, mainly depending on suspension, rheological properties or viscosity.