Medium‑High Polar Organo Bentonite BENTONE‑27 Equivalent CAS 68953‑58‑2 Rheology Additive for NC PU Nitrocellulose Paint
BENTONE‑27 Equivalent Medium‑High Polar Organo Bentonite (CAS 68953‑58‑2) is modified organoclay developed as a direct alternative to BENTONE‑27, specially formulated for medium‑high‑polar nitrocellulose NC and solvent‑borne PU coating systems. This product requires matched polar activator and sufficient high‑shear dispersion to achieve complete exfoliation of clay platelets. It builds reversible three‑dimensional thixotropic gel network within strong‑polar nitrocellulose and PU resin‑solvent ma
Product Overview
BENTONE‑27 Equivalent Medium‑High Polar Organo Bentonite, CAS 68953‑58‑2, is produced from purified natural montmorillonite via organic quaternary‑ammonium salt surface modification. It serves as a performance‑matched substitute for BENTONE‑27, optimized for demanding medium‑high‑polar solvent‑based nitrocellulose NC and PU coating formulations. Different from self‑activating bentonite grades, this organoclay needs suitable polar activator combined with intensive high‑shear mixing to realize effective exfoliation of stacked clay platelets. After adequate dispersion, exfoliated clay sheets construct a reversible three‑dimensional colloidal thixotropic network. At static storage, this network suspends color pigments and mineral fillers efficiently and inhibits the formation of hard sediment cake inside NC and PU lacquer containers. During spraying or brushing application, external mechanical shear disrupts the gel network and reduces system viscosity to deliver favorable flow and leveling for wood finishing. Once the shear force disappears, the thixotropic network rebuilds quickly to avoid sagging on vertical wooden surfaces. The product exhibits good compatibility with nitrocellulose and PU resins, preserves high gloss and clarity of clear lacquer films, and maintains consistent batch‑to‑batch quality for furniture coating mass‑production.
Key Features
‑ High‑performance organophilic bentonite equivalent to BENTONE‑27 for medium‑high‑polar solvent‑based coating systems ‑ Requires appropriate polar activator and high‑shear dispersion for full clay‑platelet exfoliation and rheology development ‑ Excellent anti‑settling capacity for pigments and fillers in nitrocellulose and PU lacquers during long‑term storage ‑ Reliable anti‑sag property on vertical wood substrates, supporting moderate thick‑film application for furniture finishing ‑ Remarkable shear‑thinning thixotropic behavior, balancing pigment suspension stability and wet‑film leveling ‑ Superior compatibility with NC nitrocellulose and solvent‑borne PU resins, low interference to coating gloss and transparency ‑ Fine free‑flowing off‑white powder, easy feeding for furniture coating production lines ‑ Consistent rheological performance for continuous manufacturing of wood finishing lacquers
Technical Specifications
‑ Product Name: Medium‑High Polar Organo Bentonite BENTONE‑27 Equivalent ‑ CAS Number: 68953‑58‑2 ‑ Appearance: Light off‑white fine powder ‑ Moisture: ≤3.5 % ‑ Loss on ignition: 33.0‑41.0 % ‑ Fineness (325 mesh residue): ≤2.0 % ‑ Bulk density: 0.21‑0.32 g/cm³
Application Scenarios
‑ Solvent‑based nitrocellulose NC furniture lacquers, clear varnishes and pigmented topcoats ‑ Medium‑high‑polar solvent‑borne PU wood coatings for cabinet and furniture finishing ‑ Decorative wood lacquer formulations requiring anti‑sag and anti‑settling rheology control ‑ Industrial medium‑high‑polar topcoats based on nitrocellulose‑modified PU resin ‑ Rheology‑modifying organoclay additive for NC and PU solvent‑based coating systems
Usage Recommendation
‑ Typical dosage range: 0.5‑2.0 % calculated on total paint weight ‑ Pre‑disperse organo bentonite with matched polar activator in solvent under high‑shear mixing at 40‑60℃ to prepare pre‑gel before adding resin, pigments and fillers ‑ Correct activator quantity together with sufficient high‑shear dispersion is critical for optimal thixotropic effect; insufficient activation or shear will cause poor thickening ‑ Run complete laboratory pre‑tests covering rheology, anti‑sag, leveling, gloss and long‑term storage stability prior to mass‑scale production ‑ Avoid excessive addition, which may lead to overly high viscosity and impaired leveling of NC and PU lacquers
Package & Storage
‑ Standard packing: 25kg kraft paper bag with inner PE liner ‑ Store in cool, dry and ventilated warehouse; protect the powder against moisture absorption and heavy compression ‑ Keep bags tightly sealed after opening to prevent moisture ingress ‑ Shelf life: 12 months under recommended storage conditions
Safety Notes
‑ Avoid dust generation and inhalation during material handling; wear dust mask and safety goggles. ‑ Prevent direct skin contact; chemical‑resistant gloves should be worn during operation. ‑ Keep away from open flame and high‑temperature heat sources. ‑ Refer to the SDS document for comprehensive guidance on handling, transportation and emergency disposal.
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