SACHTOLITH – White pigment for a wide range of … Emulsion paints and dispersion plasters...
Transcript of SACHTOLITH – White pigment for a wide range of … Emulsion paints and dispersion plasters...
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SACHTOLITH – White pigment for
a wide range of coating applications
1
SACHTOLITH – the white pigment
based on pure Zinksulfide. Designed
to offer solutions for a wide range of
applications.
Because of its special properties like
Moh’s hardness, UV-absorption edge
and low specific surface area. These
particles provide benefits to many ap-
plications.
Great Solutions with Small Particles
2
SACHTOLITH
The product
SACHTOLITH (CAS Registration No. 1314-98-3) SACHTOLITH (CAS Registration No. 1314-98-3)
is a white pigment consisting of extremely pure is a white pigment consisting of extremely pure
zinc sulfide. Highly purified zinc salt and sodium zinc sulfide. Highly purified zinc salt and sodium
sulfide solutions, from which all discolorant and sulfide solutions, from which all discolorant and
toxic heavy metals have been removed down to metals have been removed down to
ppm trace levels, are used for its production. are used for its production.
The extremely finely precipitated zinc sulfide is The extremely finely precipitated zinc sulfide is
adjusted to the narrow particle-size distribution adjusted to the narrow particle-size distribution
of approx. 0.3 μm which is optimum for scatterof approx. 0.3 μm which is optimum for scatter-
ing of light by means of calcining at arounding of light by means of calcining at around
700° C. Three SACHTOLITH grades are produced: 700° C. Three SACHTOLITH grades are produced:
L, HD and HD-S.
The SACHTOLITH grades
SACHTOLITH L is the standard grade, with no
organic treatment. SACHTOLITH HD and HD-S
contain small amounts of organic wetting agents
to improve wettability and dispersibility in aque-
ous and organic media. Thanks to its high-energy
grinding process (micronization) and a special
screening process, SACHTOLITH HD-S is free of
coarse particles and is easily dispersed. Its optical
performance is some 10 to 15 % superior to that
of the L and HD grades.
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SACHTOLITH is registered and approved for use in a large range of countries; the fol-lowing are intended only as examples: Germany:
BfR: Meets limits
VwVwS:
Not a water pollutant
EU:
AP 89 (1) and AP 96 (5) Ref. No. 96320
EN 71/3
Hazardous Substances Ordinance:
Not a hazardous in EEC 67/548 ff.
Japan:
MITI 1-572
USA:
FDA § 178.3297
TSCA 1314-98-3
Clean Air Act Amendments: Not listed
Hazardous Air Pollutants: Not an air pollutant
Properties of SACHTOLITH
Chemical
In the >4 pH range, SACHTOLITH is resistant to
practically all chemicals. Its solubility in 0.1 m
hydrochloric acid is approx. 0.3 %.
SACHTOLITH can be oxidized to ZnSO4 by power-
ful oxidizing agents or by UV radiation in the
presence of water and oxygen. ZnS is capable of
reacting superficially with additives which contain
heavy metals, particularly at high processing tem-
peratures and under exposure to UV radiation.
The property of fixing undesirable heavy-metal
ions can, on the other hand, prevent catalytic
cracking of polymers. Unlike TiO2, ZnS does not
generate any colored complexes with phenolic
anti-oxidants, and reduces the catalytic oxidation
of polymers. SACHTOLITH also remains stable up
to at least 350° C under exposure to air oxygen.
Physical
SACHTOLITH consists primarily of polycrystalline
wurtzite and is an n-type photo semiconductor,
like the TiO2 pigments. Under normal conditions,
SACHTOLITH is a good isolator (erel
approx. 8). At
approx. 27 W m-1 K-1, its thermal conductivity is
unusually high for a mineral product, its specific
heat, on the other hand, extremely low, at some
500 J kg-1 K-1.
Specific surface area and binder requirement are
low and permit good rheological properties even
at high pigmentation levels. In combination with
the pigment‘s low UV absorption, its good light
reflectance in the visible range produces a neutral
white tone and results in optimum effective-
ness of optical brighteners, Day-Glow paints and
photoinitiators.
Due to the product‘s lower refractive index (2.37)
compared to TiO2, its scattering power is lower
than that of rutile by 35 % and than that of ana-
tase by 25 %. Its spherical particle geometry and
low Mohs hardness of 3 mean that SACHTOLITH
causes no abrasion or wear on metallic materials.
Toxicological
SACHTOLITH is a practically insoluble inorganic
substance containing no harmful or notifiable
constituents. Under correct use, it is non-toxic
and is suitable, inter alia, for the pigmentation
of toys and foodstuffs packaging materials.
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Health and Safety
SACHTOLITH is practically free of toxic heavy
metals and therefore fulfills the recommenda-
tions of the German BfR Recommendation IX
for pigments, as well as a large range of other
national purity specifications.
Technical Data of SACHTOLITH
Notes for processingNotes for processing
SACHTOLITH HD-S can be dispersed in the CowSACHTOLITH HD-S can be dispersed in the Cow-
les dissolver to grindometer finenesses of less les dissolver to grindometer finenesses of less
than 20 µm at high speeds within 15 to than 20 µm at high speeds within 15 to
20 minutes; additional dispersion on the roll mill 20 minutes; additional dispersion on the roll mill
or in a pearl mill is recommendable in the case of or in a pearl mill is recommendable in the case of
SACHTOLITH L and SACHTOLITH HD.SACHTOLITH L and SACHTOLITH HD.
SACHTOLITH L HD HD-S
ZnS [%] approx. 98 98 98
Volatile constituents (105° C) [%] DIN EN ISO 787-2 approx. 0.2 0.2 0.2
pH DIN EN ISO 787-9 approx. 6 7 7
Sieve residue [%]1 DIN 53 195 < 0.02 < 0.02 < 0.004
Hardness (Mohs) approx. 3 3 3
Relative scattering power3 DIN 53 165 > 50 > 50 > 52
Lightness L* ISO 7724 approx. 98 98 98
Refractive index 2.37 2.37 2.37
Dispersibility satisfactory good very good
Light fastness good good good
Weathering resistance satisfactory* satisfactory* satisfactory*
1) Mesh gauge 45 μm 2) Measured by means of sedimentation 3) Reference pigment: Standard TiO2 = 100
* in combination with TiO2 good weathering resistance possible
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Emulsion paints and dispersion plasters
Combined with titanium dioxide-pigmen-
ted emulsion paints and dispersion plasters,
SACHTOLITH can improve rheological performance
and thus provide better conditions for applica-
tion. Combination with UV-absorbing pigments,
such as TiO2 or iron oxide pigments is the precon-
dition for the use of SACHTOLITH in weathering-
resistant paint and coating systems.
In many cases SACHTOLITH used in emulsion
paints and dispersion plasters shows a positive
contribution to keep surfaces white over a long
period of time.
SACHTOLITH has proven to be stable against
flocculation and to offer favorable flow perform-
ance in a large number of paint and coating
systems. SACHTOLITH also exhibits a remarkably
stabilizing effect when combined with colored
pigments, producing positive effects in the form
of only slight flotation and flooding.
Applications of SACHTOLITH
General
Its low binder requirement combined with its
good rheological and white-pigment proper-
ties enable SACHTOLITH to be used cost-
effectively and with technical benefits wher-
ever organic and inorganic binders need to
be highly pigmented for specific applications,
such as in undercoat lacquers, jointing and
sealing compounds, primers, etc. and also in
putties, mastics and marking paints.
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SACHTOLITH and TiO2-Rutil: absorption
SACHTOLITH
TiO2-Rutile
Printing inks
The color neutrality achievable with SACHTOLITH The color neutrality achievable with SACHTOLITH
is highly esteemed in printing inks. The pigment‘s is highly esteemed in printing inks. The pigment‘s
low abrasiveness reduces wear on the dies and low abrasiveness reduces wear on the dies and
matrices used for printing and increases life time matrices used for printing and increases life time
of the doctor blade.
UV cured paint systemsUV cured paint systems
The photoinitiators used for the curing of pigThe photoinitiators used for the curing of pig-
mented UV paint systems generally absorb light mented UV paint systems generally absorb light
in the wavelength range in which covering white in the wavelength range in which covering white
pigments, and titanium dioxide in particular, also pigments, and titanium dioxide in particular, also
absorb light to such an extent that adequate absorb light to such an extent that adequate
cross-linking cannot occur. SACHTOLITH, a zinc cross-linking cannot occur. SACHTOLITH, a zinc
sulfide pigment, the absorption edge of which is sulfide pigment, the absorption edge of which is
significantly shifted into the short-wave range, significantly shifted into the short-wave range,
is an exception. Sufficient UV radiation for the is an exception. Sufficient UV radiation for the
achievement of photoinitiator action and for achievement of photoinitiator action and for
complete curing thus remains available:complete curing thus remains available:
The curing of white UV-coatings pigmented with The curing of white UV-coatings pigmented with
SACHTOLITH is easier, faster and complete – even SACHTOLITH is easier, faster and complete – even
at higher film thickness.
This leads to lower energy consumption during This leads to lower energy consumption during
UV-Curing and better results concerning mechanUV-Curing and better results concerning mechan-
ics and adhesion of the film. On the other hand ics and adhesion of the film. On the other hand
economics increase as SACHTOLITH replaces a economics increase as SACHTOLITH replaces a
certain resin share without increased resin decertain resin share without increased resin de-
mand and the content of photo initiator can be mand and the content of photo initiator can be
reduced by up to 20%.
System:
Laromer PE 44 F
Laromer PO 83 F (PE Acrylates)
Example of ZnS in
UV curing systems
ZnS TiO2-Rutile
Powder coating systemsPowder coating systems
SACHTOLITH can also be used to advantage in SACHTOLITH can also be used to advantage in
powder-coating systems, since complete UV-powder-coating systems, since complete UV-
curing is especially a problem when applying high curing is especially a problem when applying high
film thicknesses. Additionally SACHTOLITH can film thicknesses. Additionally SACHTOLITH can
improve rheological properties in powder coat-
ings and enhances flow and throughput. The pig-
ment‘s color neutrality permits its use in all tints.
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Sachtleben Chemie GmbH A company of Holdings, Inc. P.O. Box 17 04 54 • D-47184 Duisburg / Germany Phone +49 2066 22-2615 • Fax +49 2066 22-3615 E-Mail: [email protected] • www.sachtleben.com