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Application Fields
STRUKSILON 8026 is used as a
silicone surfactant for the production of polyurethane
shoe sole systems as well as other microcellular foams. It
is especially recommended for shoe sole formulations based
on polyester and blends of polyether/polyester polyols. STRUKSILON 8026 was specifically developed to offer
excellent performance in high as well as low density
systems.
Additionally, TRUKSILON 8026 can
be successfully applied in pour-in-place systems, PUR
spray formulations and in a variety of continuous
laminated boardstock formulations.
Chemical and Physical Properties
According to its chemical structure STRUKSILON 8026 is a polyether modified polydimethyl
siloxane resistant to hydrolysis.
STRUKSILON 8026 is a clear, colourless to slightly
yellow liquid of middle viscosity, has strong surfactant
properties and is miscible with water at room temperature.
General Chemical
Structure
Typical Properties
Viscosity at
25°C mm2/s 350
Density at 25°C kg/m3 1,071
Flash Point (DIN/ISO 2562)
°C > 100
Refractive Index
at 25°C 1,454
Technical Properties
STRUKSILON 8026 was specifically designed to be used in shoe sole and
other microcellular systems. It is mainly recommended for
polyester and polyester/polyether blend based
formulations.
STRUKSILON 8026 offers an excellent regular and fine cell structure and
a good skin formation. Even in low density foams skin
defects and voids on or slightly under the surface can be
avoided. Very low shrinkage will be observed even at short
demould times using low density formulations.
Due to this
outstanding performance
STRUKSILON 8026 is recommended as a wide density range silicone
surfactant for all polyester polyol based shoe sole
applications in formulations from 0,34 g/cm³ to 0,58
g/cm³.
Performance
Test Results:
Test objective:
The test was
carried out as a comparison test of
Struksilon 8026 and two reference materials. The comparison material A is
a silicone surfactant mainly recommended for high density
shoe sole systems. Comparison B is a surfactant mainly
recommended for low density shoe soles.
The major task
was to compare the influence of the surfactant on the cell
structure, the skin formation and the general processing
of the systems.
Higher density:
The test for
higher density was carried out in a standard polyester
polyol based system. Demould densities of 0,56 g/cm³ were
obtained.
General
results: All three surfactants showed an excellent skin
formation, a fine cell structure and excellent processing.
Lower density:
For the
production of the lower density foams a standard shoe sole
system with a demould density of 0,36 g/cm³ was chosen.
Test
formulation:
polyester polyol linear, adipic acid
based, OH-value = 56 mg KOH/g 83,23
monoethyleneglycol 13,9
triethylenediamine
33,3% triethylenediamine in MEG 2,05
water H2O 0,55
silicone silicone surfactant 0,27
100,00 parts
prepolymer 20% NCO 132 parts
free rise density:
0,21 g/cm³
demould density: 0,38 g/cm³
Processing:
prepolymer
temperature: 60°C
polyol temperature:
55°C
mould temperature: 50°C
demould time: 3,5 min
The tests were carried out using a
standard low pressure mixing device.
With all three
materials a demould time of 3,5 min was reached.
Skin formation:
The comparative silicone surfactant A
mainly recommended for higher densities showed voids and
skin defects in the majority of the produced samples.
For STRUKSILON 8026 no skin defects were observed.
Dimensional stability:
None of the
samples showed a shrinkage of more than 2%.
Cell
structure:
DLC STRUKSILON 8026
Comparison B Comparison
A
 
STRUKSILON 8026 exhibits an
excellent fine cell structure. Comparison B offers an almost
identical cell structure, while comparison A shows coarse and
irregular cells
Results
STRUKSILON 8026 is an
excellent wide density range silicone surfactant for shoe sole
systems. The product allows to make shoe soles characterised
by excellent cell structure, very good physical properties as
well as improved processing in both, high and low density shoe
sole systems.
Recommended Dosage
Usually, STRUKSILON 8026 is applied
in quantities of 0.1 to 1.0 php (parts on 100 parts polyol).
We recommend to adjust the optimum dosage to the
corresponding formula. However, a concentration of 2 php
should not be exceeded.
Product Safety and Handling
STRUKSILON 8026 is not a hazardous
material for the purposes of hazardous materials
regulation.
Further information regarding safety,
toxicology, special properties of the product, transport
and storage are given in the safety data sheet.
Packaging, Storage and Transport
Storage stability 12 months in
closed original containers if transported and stored at
temperatures between 1 and 30°C.
Packaging
200 kg drums
1000 kg containers (IBC)
This information is based on our present knowledge and
experience. The values given are not intended to prepare
specifications. Our technical advice and recommendations
whether verbal, in writing or by way of trials do not
absolve the customer, on account of the many outside
influences which may affect the product use and
application, from their own testing and trials. A legally
binding assurance based on information contained herein
regarding particular properties or the suitability for
definite customer applications cannot be assumed. The
customer bears the responsibility for the observation of
possible patent and trademark rights in addition to
relevant laws and regulations relating to the products.
If you don't find what you're looking for,
Contact Us.
We may have a suitable product that's not listed, or we may be
able to develop a material to fit your specific needs.
Tel : (02)2217-3442 / Fax : (02)2704-4070
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