Malvern Minerals Company
220 Runyon Street
Hot Springs, AR 71901
501-623-8893

Why Novacite® or Novakup® ?


Barrier Properties

  • Platy and Hard
  • Overlapping Platelets - parallel to the substrate surface, “somewhat like shingles on a roof”

Higher Loading

  • Oil Absorption – 17%
  • Particle Shape
  • Ultra High Solids

Lower VOCs

  • Oil Absorption
  • Particle Shape

Easy Wet-Out

  • No Porosity
  • Low oil absorption
  • Reduced surface area
  • Superior Rheology
  • Low oil absorption
  • No sub-1µ particles (stops a 1µ)
  • Plates rubbing rather than jagged particles
 

Features

  • Lamellar or Platy Shape
  • Wettable
  • No porosity
  • Lowest oil absorption 17%
  • Refractive index is typically lower than the resin system
  • High dielectric and insulating properties – “it’s quartz”
  • Chemically inert
  • Anti-corrosive qualities
  • Close to pure quartz (99.49)
  • Zero moisture
  • Mohs hardness 7

Thermal Properties (additional notes)

  • Low or “alpha” quartz.
  • It is stable in its phase from absolute 0° to 573°C.
  • Inversion and reconstructive inversion occur just past 573°C.
  • Novacite filled thermosets maintain dielectrics under prolonged saturation.
  • Novacite has an absence of bound water.
  • Novakup products will stress relax differences in coefficients of thermal expansion and contraction from 7.5% to 24.6%.
  • Specific Heat:
    • Typical silica 0.320 cal/(g)/(C°).
    • Pure quartz 0.188 cal/(g)/(C°).
    • Novacite 0.192 cal/(g)/(C°).
  • Finer grades possess lower SH than coarser grades.

This is paradoxical since finer subdivision should call for greater heat capacity and greater specific heat, but here again, you encounter a departure from what might be expected.


Crystallography

  • Very uncommon “variety” of a very common mineral.
  • Anhedral or Subhedral crystals
  • “Parting” takes place along planes which are generally reasonably “perfect”
  • Pseudo-cubic individual particles. Ideal particle is one micron in length.
  • Novacite parts or cleaves along the principle axis of its molecular structure.

Note: The author has neither observed a type of quartz just like Novacite® nor encountered a recorded instance of a similar occurrence of the mineral.


Novakup® Surface Modified or Silane Treated Novacite®

  • Novakup – Envision a three-micron particle of quartz with epoxy pendant groups protruding from all sides at a rate of 4 to 6 per 100Å2
  • Novacite has surface area of 2M2/g
  • Approximately 1.2 x 1019 OH groups per gram of Novacite based on 6 OH groups per 100Å2
    • This calculation assumes that each silane will react with only one of the surface OH’s, while theorectically, it may react with up to three.
  • Surface Area:
    • 28 billion particles per gram with approximately
    • 1.2 x 1019 pendant groups per gram.
  • Thus the 0.47% is a maximum required for monomolecular coverage, and we would guess that considerably less would be necessary for positive results.
  • “The less the silane concentration, the better the result”

It is well known that naturally occurring particulate materials are many times deleterious to a polymer mixture (like adding “dirt” to the “batter”) regardless of how much care is taken in mining or processing.


Benefits of Novakup®

  1. ENABLES HIGHER FILLER LOADING
  2. IMPROVES PROCESSABILITY
  3. IMPROVES CHEMICAL RESISTANCE
  4. IMPROVES FILLER DISPERSION
  5. IMPROVES COMPOSITE STRENGTH
  6. IMPROVES ELECTRICAL PROPERTIES
  7. IMPROVES PROPERTY UNIFORMITY
  8. IMPROVES WET-OUT OF THE MINERAL BY THE POLYMER
  9. CLOSES THE VOID BETWEEN FILLER AND POLYMER
  10. IMPROVES MECHANICAL PROPERTIES
  11. REDUCES THE VISCOSITY OF THE FILLER/POLYMER MIX
  12. ELIMINATES A STEP IN THE PRODUCTION PROCESS (NO NEED FOR IN-SITU)

The lower the permeability of a barrier coating, the more protective the coating is. Basically, the higher the degree of the coating resin's cross-linkage, the lower the permeability, the better the adhesive bond of the coating to the surface, and the better the overall protective barrier.


Potential Coupler Selection Guide

August 23, 2013

Thermosets:

  • DAP – Vinyls silanes
  • Epoxy – Epoxy or amino silanes
  • Phenolic – Epoxy Silanes
  • Polybutadiene – Vinyl and methacryloxy silanes
  • Polyester – Vinyl, methacryloxy, epoxy silanes
  • Polyethylene (crosslinked) – Vinyl and methacryloxy silanes
  • Polyimide-Amino silanes and glass resins
 

Thermoplastics:

  • Acrylic-methacryloxy silane
  • Polycarbonate - Epoxy silane
  • Polyester - Epoxy silane
  • Polyethylene - Vinyl and methacryloxy silanes
  • Polypropylene – Vinyl and methacryloxy silanes
  • PVC – Epoxy, mercaptan silanes
  • Polyurethane – Amino, mercaptan and methacryloxy silanes

Elastomers

  • Neoprene – Mercapto and amino silanes
  • Nitrile (NR) – Mercapto and amino silanes
  • Polyisoprene - Mercapto silanes
  • SBR - Mercapto silane
  • Silicone – Vinyl and methyl silane
  • Urethane – Mercapto silane