Adding
small amount of inorganic filler such as TiO2
or BaSO4 to clear polyester can improve
spinning performance by improving friction. While
TiO2 would increase turbidity of the
polyester, BaSO4 would not increase
turbidity because it has similar reflective index as
polyester. Most clear polyester producers add BaSO4
around 1000 ppm.
Glysil developed high quality barium sulfate slurry
in glycol, which does not require further milling
before use in polyester. It can be diluted to 3% to
20% before use. Glysil®BaSO4 slurry is
more stable and does not separate into two layers
like the BaSO4 slurry from other
vendors. Quality check by vacuum filtration is more
than 2,000 ml. Clear fibers containing barium
sulfate made by Glysil has superior spinning and
drawing performance. The life of polymer melt
filter is also much longer than other the barium
sulfate. This technology is patented in the U.S.
Barium sulfate slurry produced by
Glysil technology has smaller particle size than
that from other producers. When particle size is
reduced by half, the number of particles increased
to 8 times at the same weight. Glysil® barium
sulfate in polyester can be reduced by more than 50%
compared with the larger particle size barium
sulfate from other producers.
Since
2008, Glysil® GS-26 (BaSO4 slurry in glycol)
has been used by Jiangsu Sanfangxiang in China in their
clear staple production line of 600 tons/day, Yizheng
Chemical Fibers of Sinopec Group in their clear staple
line of 300 tons/day, and Huaxi Baochang Chemical Fibers
in their clear staple line of 300 tons/day. The spinning
and drawing performance have been excellent.
Comparison of
Glysil® GS-26 Barium Sulfate Slurry
|
Barium Sulfate
|
A Germany producer |
Glysil®
GS-26 |
|
Product |
Powder, BaSO4 94%
|
Slurry, BaSO4 30% |
|
Sand mill by PET
producer |
Sand mill then
dilution |
Sand mill not
necessary |
|
Slurry quality:
Standing, clear liquid on top |
Separate in a few
hours |
less than 5% after 30
days |
|
Slurry quality:
Standing, solid in bottom |
Large amount of solid |
less than 5% after 30
days |
|
Slurry quality:
vacuum filtration |
10% slurry 300~500 ml
|
30% slurry > 2,000 ml
|
|
BaSO4
particle size, nm |
large (400~600 nm) |
small (200~300 nm) |
|
Polymer melt filter
(20 µm) |
7-10 days |
15-30 days |
Equipment to use
Glysil®GS-26 BaSO4
slurry is similar to that of TiO2 slurry.
Glysil®GS-26 BaSO4 30%
slurry can be shipped in 1000-liter container or
200-liter drum, and diluted to 3% to 15% before use. The
following example diluted to 15%.
BaSO4 30% 1500 kg + glycol
3000 kg = BaSO4 10% 4500 kg,
Agitated dilution tank 3 m3
(15%), feed tank 4.5 m3 (15%), stainless
steel 314, no heating.
One mass flow meter, stainless steel
314 or 316. Two meter pumps, stainless steel 314.
|
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