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 Mica
in Paints and Coatings
CMMP's muscovite micas are important
technical additives to a number of specialist paints and coatings to increase
weathering resistance (durability, chalking, cracking…). They help
to improve anti-corrosive properties, protect against wear from sunlight
and heat and give a shine to the surface.
Properties
Barrier effect
mica is used to provide a barrier to
the ingress of moisture and to assist adhesion, so increasing corrosion
protection. Reduction in the permeability of films incorporating mica
can be ascribed to the co-planar packing of lamellar particles within
the film, forming overlapping layers, which are aligned parallel to the
substrate. Lamellar particles packing forms a barrier, by increasing the
length of the pathway along which the water must travel to reach the substrate.
Resistance to UV
mica protects organic binders from early degradation by light and UV rays.
An array of the flat platelets remains on the surface. This presents a
hard, coherent barrier, which protect the underlying resin by reflecting
sun radiation.
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UV shielding effect
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Paint film reinforcement
The platy structure (high aspect ratio) of CMMP's micas
reinforces mechanically the paint film,
while providing a resistant shield. It helps to release some of the internal
stresses created during film coalescence, inhibiting mudcracking and crack
propagation through the film.
Chemical resistance
CMMP's micas are insoluble in water and have an excellent chemical resistance,
unaffected by strong mineral acids such as sulfuric and hydrochloric,
They are only attacked by concentrated hydrofluoric acid. Therefore the
laminar and inert nature of these micas in resins present a formidable
barrier to chemical attacks.
Dispersion
The platy structure of mica disperses easily within paint solutions and improves the dispersion
of the other combined fillers.
Coloration
CMMP's micas are white muscovite micas
and can be combined with suitable pigments to obtain a wide range of colors.
CMMP's micas containing paints gave similar results when compared with
the system without mica for contrast ratio, brightness and yellowness,
proving that CMMP's micas are not detrimental to the optical properties.
Food contact
CMMP's micas are natural products and
present no toxicity. They are in conformity with the standard EN 71/3.
Prevent chalking
Increase film brushability
Provide smooth and attractive surfacing
Improve temperature resistance
Applications
CMMP's micas find application in exterior and
industrial coatings such as:
- Aluminium paints
- Anticorrosive paints
- Decorative coatings
- Emulsion paints
- Intumescent coatings
- Marine paints
- R.P.E.
- Texture paints
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Additional documentation
- Protective and Barrier effect of Mica in Paints
For additional information, please contact us:
CMMP
45, rue de Saint-Petersbourg
75008 Paris
FRANCE
Tel : +33 1 43 87 45 75
Fax : +33 1 42 94 96 32
E-mail : cmmp@cmmp-france.com
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Since 1932, family-owned company
