BENTONE® 38

Manufacturer: Elementis Specialties Inc.

Ingredient Type: Additive

Function: Rehology Modifier Agent

GENERAL INFORMATION

BENTONE 38 is an organic derivative of a hectorite clay. This highly efficient rheological additive is designed for low to intermediate polarity organic systems.

CHEMICAL & PHYSICAL PROPERTIES

These are typical properties not to be used for specification purposes.

APPLICATIONS

  • Adhesives and mastic compounds
  • Aerosol paints
  • Anti-corrosive paints
  • Automotive finishes, primers
  • Coil coating systems
  • Cosmetics
  • Industrial paints
  • Interior and exterior house paints
  • Mould release agents
  • Plastisols, organosols
  • Primers
  • Refinish systems
  • Trichlorethylene dip coatings
  • Water-reducible systems
  • Wood stains

KEY PROPERTIES

  • Increases viscosity
  • Provides thixotropy
  • Prevents pigment settling during storage
  • Improves flow and leveling
  • Controls sagging on vertical surfaces and Penetration on porous substrates
  • Prevents syneresis in thixotropic systems

INCORPORATION

Incorporation of BENTONE 38 in organic systems (e.g. paints) requires high-shear dispersion equipment and a chemical activator.
Two basic incorporation methods can be used:
1. Addition of BENTONE 38 as a dry powder for
in-situ dispersion and activation The BENTONE 38 powder is added directly to the resin/solvent blend and is thoroughly mixed for 10 minutes. A chemical activator (see below) should be added next and mixed for 10 minutes.
The pigments and fillers are then added and dispersed with high shear for at least 15 minutes.
2. Addition of BENTONE 38 as pregel of 5 -10% by weight
The solvent is charged to the mixing tank. BENTONE 38 powder is added and dispersed under high shear. A chemical activator can then be introduced to optimize gelation (see below). For incorporation in the full formulation the pregel is added to the resin/solvent mixture with stirring.
Pigments and fillers are then incorporated and dispersed under high shear. For more details see the Elementis Specialties Rheology Handbook.

Suitable Dispersion Equipment
High-speed disc impellers (Cowles dissolver); Ultra-Turrax, pearl-, sand-, ball- and three-roll mills.

Chemical Activators
Recommended to ensure full activation, i.e. optimum efficiency of BENTONE 38.

LEVELS OF USE

The level depends on the system in which BENTONE 38 is to be used. For house paints and industrial paints typical levels are between 0.2 and 0.5% (dry) BENTONE 38 based on total system weight. In synthetic resins (epoxy, polyester), quantities range between 0.5 and 1.0 %.

ALTERNATIVE PRODUCTS

The level depends on the system in which BENTONE 38 is to be used. For house paints and industrial paints typical levels are between 0.2 and 0.5% (dry) BENTONE 38 based on total system weight. In synthetic resins (epoxy, polyester), quantities range between 0.5 and 1.0 %.

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